Journal articles: 'Reciprocating pumps'

1

Han, Z. G., and Qing Jian Liu. "Dynamic Analysis on Crank-Slider Mechanism of Reciprocating Pump." Materials Science Forum 697-698 (September 2011): 676–80. http://dx.doi.org/10.4028/www.scientific.net/msf.697-698.676.

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The crank-slider mechanism is the key component in reciprocating pumps. With the increase of the rotational speed of the crank-slider mechanism, the vibration and working noise of reciprocating pumps increase. Based on the multi-body dynamics theory, the dynamic model of the crank-slider mechanism of reciprocating pumps is proposed. A numerical example is given and the validity of the procedure developed here is demonstrated by analyzing the dynamic behavior of a typical crank-slider mechanism of the reciprocating pump. The model can well simulate the dynamic response of the mechanism, which can enable designers to obtain required information on the analysis and design of reciprocating pumps.

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Akarte, Parag. "Solar Based Reciprocating Pump." International Journal for Research in Applied Science and Engineering Technology 10, no. 5 (May 31, 2022): 4492–97. http://dx.doi.org/10.22214/ijraset.2022.43443.

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Abstract: The soul of India lives in the villages and the backbone of that soul is the agricultural sector Improvement in irrigation is necessary to strengthen the economic background in agriculture. In present times, more power is required for people to use new equipment. Solar energy must be used optimally to achieve the expected results that it is environmentally friendly and can be run with less power consumption than central pumps and fuel-based pumps. Its ultimate objective is to lift water from the level discharged through water resources. Therefore, electric energy is powered by the help of PV panels and batteries charged by the Sun rays and electric power is obtained to drive the DC motor Which provides power to the reciprocating pump with mechanical power to the connecting rod. The system consists of a single solar panel, battery, motor, crankshaft, exchange pump, valve and tank

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Sahoo, Trinath. "Cavitation in reciprocating pumps." World Pumps 2006, no. 472 (January 2006): 24–27. http://dx.doi.org/10.1016/s0262-1762(06)70879-3.

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Shcherba, V. E., and E. A. Dorofeev. "Determination of the areas of the main operational parameters of a reciprocating hybrid power machine with regenerative heat exchange." Proceedings of Higher Educational Institutions. Маchine Building, no. 11 (752) (November 2022): 69–77. http://dx.doi.org/10.18698/0536-1044-2022-11-69-77.

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The thermodynamic and dynamic analysis of working processes and acting forces in single-stage reciprocating compressors and pumps has been performed. It has been established that, despite the general tendency to increase the crankshaft velocity and the discharge pressure of the compressible gas and dropping liquid in reciprocating single-stage compressors and pumps, there are their optimal values, which are determined on the basis of the maximum values of the supply coefficient, indicator, volumetric and total efficiency. It is shown that these values also have limits, bounded by the oil flash point (for reciprocating compressors) and permissible stresses in the parts and assemblies of the drive mechanism (for reciprocating compressors and pumps). It was found out that for a reciprocating hybrid power machine with regenerative heat exchange, the crankshaft velocity could be taken equal to 300...700 rounds per min-1, and the discharge pressure of the compressible gas and dropping liquid is 0.2...1.5 MPa.

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Pan, Chong Chao, Zheng Qian Feng, Peng Cheng Li, and Hai Hong Chen. "The Research on Energy Saving of Pump Fluid Conveying System." Advanced Materials Research 860-863 (December 2013): 704–8. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.704.

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In order to determine the energy saving effect of the pump system after the energy saving technical reconstruction project implementation, this paper mainly researches on how to measure and verify the pump system energy saving after the energy saving technical reconstruction project implementation for AC drive (drag) centrifugal, mixed flow, axial flow, vortex pumps and reciprocating pumps. This paper also puts forward the related definitions, boundaries, methods, technical requirements of measurement and verification, etc.

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Wu, Meng Li, and Jia Bin Yuan. "Analysis of the Pulsation in Aircraft Deicing System." Applied Mechanics and Materials 251 (December 2012): 104–8. http://dx.doi.org/10.4028/www.scientific.net/amm.251.104.

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Two methods are proposed in the paper to reduce the flow and pressure pulsation caused by the reciprocating pump in aircraft deicing system. First, the control algorithm for multiple phases of pumps is used to cut down the pulse energy among the pumps. Then the inflatable accumulator is used in combination with pumps to make the fluid more stable. At last, the simulation results show that the methods can effectively decrease the pulsation in the system.

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Zwarts, M. S., S. R. Topaz, D. N. Jones, and W. J. Kolff. "A computer controlled pulsatile pump: preliminary study." International Journal of Artificial Organs 19, no. 12 (December 1996): 719–22. http://dx.doi.org/10.1177/039139889601901207.

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A Stepper Motor Driven Reciprocating Pump (SDRP) can replace roller pumps and rotary pumps for cardio pulmonary bypass, hemodialysis and regional perfusion. The blood pumping ventricles are basically the same as ventricles used for air driven artificial hearts and ventricular assist devices. The electric stepper motor uses a flexible linkage belt to produce a reciprocating movement, which pushes a hard sphere into the diaphragm of the blood ventricles. The SDRP generates pulsatile flow and has a small priming volume. The preset power level of the motor driver limits the maximum potential outflow pressure, so the driver acts as a safety device. A double pump can be made by connecting two fluid pumping chambers to opposing sides of the motor base. Each pump generates pulsatile flow. Pressure and flow studies with water were undertaken. Preliminary blood studies showed low hemolysis, even when circulating a small amount of blood up to 16 hours.

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Burton, J. D., and T. D. Short. "Induced flow reciprocating pumps Part 1." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 213, no. 5 (August 1999): 363–73. http://dx.doi.org/10.1243/0957650991537743.

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Burton, J. D., and T. D. Short. "Induced flow reciprocating pumps Part 2." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 213, no. 5 (August 1999): 375–89. http://dx.doi.org/10.1243/0957650991537752.

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10

Faria, Monica, Yi Liu, and Edward F. Leonard. "Particle Spallation in a Microfluidic Blood Processing Device: The Problem of Using Peristaltic Pumps and Silicon-based Microfilters." International Journal of Artificial Organs 40, no. 10 (June 15, 2017): 589–93. http://dx.doi.org/10.5301/ijao.5000609.

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Peristaltic pumps rely on constant compression of elastomeric tubing from which particles may be shed, a phenomenon known as spallation. We studied spallated particles on microfluidic filtration devices with photolithographically prepared micron-level pore fields. Filtration of ultra-pure water through these pores was analyzed using either the usual peristaltic pump or a reciprocating pair of syringe pumps. Using syringe pumps, transmembrane pressure (TMP) values during filtration at 2.5 cm3/min revealed steady filtration for over 80 minutes at 2.3 mmHg. Using the peristaltic pump, TMP was never stable, increasing to approximately 11 mmHg during the first 10 minutes. Pore plugging was the culprit, evidenced by post-perfusion microphotography.

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Zaili, Zarin Syukri, Ahmad Anas Yusof, Nur Fathiah Mohd Nor, Mohd Hafidzal Mohd Hanafi, and Mohd Qadafie Ibrahim. "Characteristics of a Reciprocating Pump for Low-Cost Sustainable Water Hydraulic Technology Demonstrator." Applied Mechanics and Materials 699 (November 2014): 736–41. http://dx.doi.org/10.4028/www.scientific.net/amm.699.736.

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An investigation of water-based reciprocating triplex piston pump was conducted to propose a low cost solution for the substitution of the traditional oil hydraulics to water hydraulics. Triplex pumps used in this investigation as the water hydraulics require continuous pumping. These pumps are capable of handling a wide range of fluid types, including corrosive fluids, abrasive fluids, and slurries containing relatively large particulates. Thus, an evaluation of the triplex pump using a simple simulation process that focuses on the volumetric efficiency has been conducted in order to understand its ability in energy-efficient system. In this paper, the results of a simulated study of a positive displacement triplex piston pump are presented. The result concludes that the use of water is relatively efficient if the slip factor is maintained to 0.003, with the system pressure is set from 10 to 40 bar.

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Wu, Meng Li, Bin Chen, and Zhi Wei Xing. "Research of Flow and Pressure Pulsation in Aircraft Deicing System." Applied Mechanics and Materials 128-129 (October 2011): 990–93. http://dx.doi.org/10.4028/www.scientific.net/amm.128-129.990.

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Aiming at the flow and pressure pulsation caused by the reciprocating pump in aircraft deicing system, two solutions are presented in the paper. First, based on computational fluid dynamics and finite element analysis theory, the assembled ways of rigid and flexible accumulators are applied to absorb vibration in order to inhibit the pulse. Then, the control algorithm for multiple phases of three pumps is used to offset the pulse energy among the pumps. At last, simulation results show that both methods have effectively reduced the pulsation in the aircraft deicing system.

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Faryami, Ahmad, Adam Menkara, Daniel Viar, and Carolyn A. Harris. "Testing and validation of reciprocating positive displacement pump for benchtop pulsating flow model of cerebrospinal fluid production and other physiologic systems." PLOS ONE 17, no. 5 (May 12, 2022): e0262372. http://dx.doi.org/10.1371/journal.pone.0262372.

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Background The flow of physiologic fluids through organs and organs systems is an integral component of their function. The complex fluid dynamics in many organ systems are still not completely understood, and in-vivo measurements of flow rates and pressure provide a testament to the complexity of each flow system. Variability in in-vivo measurements and the lack of control over flow characteristics leave a lot to be desired for testing and evaluation of current modes of treatments as well as future innovations. In-vitro models are particularly ideal for studying neurological conditions such as hydrocephalus due to their complex pathophysiology and interactions with therapeutic measures. The following aims to present the reciprocating positive displacement pump, capable of inducing pulsating flow of a defined volume at a controlled beat rate and amplitude. While the other fluidic applications of the pump are currently under investigation, this study was focused on simulating the pulsating cerebrospinal fluid production across profiles with varying parameters. Methods Pumps were manufactured using 3D printed and injection molded parts. The pumps were powered by an Arduino-based board and proprietary software that controls the linear motion of the pumps to achieve the specified output rate at the desired pulsation rate and amplitude. A range of 0.01 mlmin to 0.7 mlmin was tested to evaluate the versatility of the pumps. The accuracy and precision of the pumps’ output were evaluated by obtaining a total of 150 one-minute weight measurements of degassed deionized water per output rate across 15 pump channels. In addition, nine experiments were performed to evaluate the pumps’ control over pulsation rate and amplitude. Results Volumetric analysis of a total of 1200 readings determined that the pumps achieved the target output volume rate with a mean absolute error of -0.001034283 mlmin across the specified domain. It was also determined that the pumps can maintain pulsatile flow at a user-specified beat rate and amplitude. Conclusion The validation of this reciprocating positive displacement pump system allows for the future validation of novel designs to components used to treat hydrocephalus and other physiologic models involving pulsatile flow. Based on the promising results of these experiments at simulating pulsatile CSF flow, a benchtop model of human CSF production and distribution could be achieved through the incorporation of a chamber system and a compliance component.

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14

Berther, Thomas, and Patricia Davies. "Condition Monitoring of Check Valves in Reciprocating Pumps." Tribology Transactions 34, no. 3 (January 1991): 321–26. http://dx.doi.org/10.1080/10402009108982040.

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15

Vetter, Gerhard, and Friedrich Schweinfurther. "Pressure pulsations in the piping of reciprocating pumps." Chemical Engineering & Technology - CET 10, no. 1 (1987): 262–71. http://dx.doi.org/10.1002/ceat.270100132.

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16

Hesterman, D. C., and B. J. Stone. "A Systems Approach to the Torsional Vibration of Multi-Cylinder Reciprocating Engines and Pumps." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 208, no. 6 (November 1994): 395–408. http://dx.doi.org/10.1243/pime_proc_1994_208_145_02.

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The systems approach for the vibration analysis of complex systems requires that the receptances of the sub-systems are available. For the torsional vibration of rotating systems including reciprocating engines and/or pumps it has been the practice to represent the reciprocating mechanism by a constant rotary inertia. This paper describes the derivation of the receptance for such reciprocating mechanisms, which includes the effects of non-constant rotary inertia. It is then shown how the natural frequencies for torsional vibration vary with angular position and how this in turn affects the vibration in the time domain. The significance of the effects indicated by these simulation techniques is then demonstrated by comparing with results obtained from an experimental investigation.

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17

Huang, Yu, Jian Ruan, Chuan Ding, and Sheng Li. "Effect of clearance on volumetric efficiency in 2D piston pumps." Advances in Mechanical Engineering 13, no. 10 (October 2021): 168781402110477. http://dx.doi.org/10.1177/16878140211047727.

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In order to solve the limitations of the friction pairs in axial piston pumps on rotational speed and mechanical efficiency, a 2D piston pump whose 2D piston has two-degree-of-freedom motions of rotation and reciprocating motion was proposed by the author team. The volumetric efficiency of 2D pumps predicted by the original volumetric efficiency model is higher than the experimental results. A new mathematical model of the volumetric efficiency is researched by considering effect of clearance between the cone roller and the guiding rail. In previous studies, the volumetric losses of the 2D pump were considered to be composed of leakage and compressibility loss. However, it is found that the effect of the clearance on the volumetric efficiency in 2D pumps is greater than that of leakage and compressibility loss. The experimental results show that the difference between the prediction of the new model and the volumetric efficiency of the tested pump with 0.19 mm clearance is reduced from 8% to 1.5% comparing with the original model. The volumetric efficiency of the tested pump without the clearance is 96.5% at 5000 rpm rotational speed and 8 MPa load pressure.

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Johnston, D. N. "Numerical Modelling of Reciprocating Pumps with Self-Acting Valves." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 205, no. 2 (May 1991): 87–96. http://dx.doi.org/10.1243/pime_proc_1991_205_318_02.

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PIASZYK, Jakub, and Miroslaw WYSZYŃSKI. "Possible application of animal fat as engine fuel - lubricity aspects." Combustion Engines 147, no. 4 (November 1, 2011): 35–42. http://dx.doi.org/10.19206/ce-117065.

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Thepaperpresents results of animalfat lubricity testperformed at highfrequency reciprocating rig (HFRR). Impact of test temperature on wear scar diameter (WSD) is shown. Results for animal fat are compared with those for mineral diesel fuel (ULSD). Obtained WSD prooved excellent lubricating properties of animal fat. Laboratory test results are backed up with engine trials where two sets offuel pumps were tested on a large reciprocating engine. Animal fat can be used asfuelfor engines -when appropriatefiltrationprocess is implemented.

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Dyrcz, Krzysztof, Mariusz Kubiczek, Ernest A. Mendrela, and Piotr Derugo. "Dynamics of Switched Reluctance Linear Tubular Motor for Reciprocating Water Pump." Energies 14, no. 2 (January 14, 2021): 430. http://dx.doi.org/10.3390/en14020430.

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Simple, cheap, and efficient water pumps are needed in developing countries. A reciprocating water pump driven by a switched reluctance linear tubular motor with double pistons that can be supplied from a photovoltaic power source seems to respond to this demand. This type of new motor (one with reciprocating motion) is presented in the paper. In order to develop a strong driving force at two extreme piston positions and achieve a long piston stroke, a double coil motor with a double secondary and two springs is proposed. Simulation results of force, current, and voltage waveforms obtained using MATLAB/Simulink are presented. The electromagnetic forces and coil inductances, which depended on the current and the secondary positions of the pistons, were determined using FEM. Simulation results are compared with those obtained from an experiment carried out on the motor prototype.

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Sadek, Mohamed, Rehab El-Maghraby, and Mohamed Fathy. "Evaluation of variable speed drives to improve energy efficiency and reduce gas emissions: Case study." Chemical Industry and Chemical Engineering Quarterly, no. 00 (2022): 18. http://dx.doi.org/10.2298/ciceq220318018s.

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Variable speed drives are the most promising technique to reduce electric motors energy consumption. This paper discusses energy savings achieved by installing variable speed drives to control rotating equipment motors such as pumps, compressors, blowers, and fans in oil processing facilities. In addition to energy savings, variable speed drives will improve overall equipment efficiency, increase reliability, and reduce greenhouse gases (GHG) emissions. An Energy audit was performed on a case study to investigate energy consumption for all electric motors. Technical and operational constraints for installing and operating variable speed drives have been discussed. Installation requires adjustments in operation schedules and parameters to allow reducing energy consumption. The case study has illustrated how to calculate energy savings for Pipelines, air coolers, air blowers for furnaces, pumps with variable flow rates and reciprocating compressing systems. Variable speed drives were technically and economically accepted in air blowers, fans, and pumps. Energy consumption and greenhouse gases have been reduced by 67%, Payback period for the whole project was less than 1 year. Meanwhile, it was not valid for reciprocating compressors as the Payback period was 6.2 years.

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Hesterman, D. C., and B. J. Stone. "Secondary Inertia Effects in the Torsional Vibration of Reciprocating Engines—A Literature Review." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 209, no. 1 (January 1995): 11–15. http://dx.doi.org/10.1243/pime_proc_1995_209_117_02.

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It has been known for some time that the torsional vibration of reciprocating engines and pumps cannot be modelled accurately by representing the reciprocating mechanism by a constant inertia. There have been many publications describing better models than those that use constant inertia and these indicate that the effective inertia of a reciprocating mechanism varies with angular position. The major component of this variation is a twice per revolution cyclic effect—hence the term ‘secondary inertia’. The consequences of this secondary inertia effect can be serious for torsional vibration causing ‘secondary resonance,’ and even instability. This paper contains a review of the current literature on the subject and introduces some recent work by the authors.

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Alfian Hamsi and Tulus Burhanuddin Sitorus. "MECHANISM OF WATER DISTRIBUTION ON LEMON FARM LAND." ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat 3, no. 2 (October 2, 2019): 118–24. http://dx.doi.org/10.32734/abdimastalenta.v3i2.2638.

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Pump is mechanical device to increase the pressure energy of a fluid. Generaly pumps are used to lift the water from low level to high level. These are of two types,namely reciprocating pumps and centrifugal pumps. On centrifugal pumps the centrifugal force or variation of pressure due to rotation is responsible for their operation or working. The program of community services as implementation of sciences and technology intended to introduced and give skill training about water supply units to the community at Desa Sempa jaya ,Kabupaten Deli-Karo. In this area the people have a problem about availibity of water for agricultute, when mountain Sinabung gets eruption the leave of plantation are covered with dust and damaged to citrus plants,in dry season orange plants lack of water even though the success of the harvest is very dependent on water. The program was carried out by designing, fabricating and erecting the unit of water supply,consist of deepwell pump,piping system, valve,tee,bent,tower tank and panel control. The result of this community services showed that the capacity of pumps are 6 liter/menit,head are 50-70 meter,power 2 HP,speed 1500 rpm.capacity of tower tank 5400 liter, the pump may supply the water to tower tank until full about 2 hours,and the farmer may use the water from the tower tank by gravitation about 3 days.

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Wang, Li Wen, Yong Shen Long, and Zhi Wei Xing. "Study on De-Icing Fluid Pump Station’s Flow Pulsation Suspension Methods." Advanced Materials Research 605-607 (December 2012): 1330–34. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.1330.

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This article studies the flow pulsation of de-icing fluid pump station. First, find the factors affect the extent of flow pulsation through kinetics analysis. Then, base on the summary of the existing pulsation suspension methods (Include combining work of several pumps with an equal original phase differences, changing a single acting pump with a double acting pump), we put forward the method by optimizing the structure of the reciprocating pump to inhibit the flow pulsation. Use system simulation software AMESim to simulate the effect of these methods. Ultimately get the conclusion that the flow pulsation can be controlled at about 12% through these methods. All these works may provide a reference for the design of a de-icing fluid pumping station.

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Atanov, I. V., I. V. Kapustin, D. I. Gritsay, and E. V. Kulaev. "Study of operating modes of a double-chamber diaphragm milk pump." IOP Conference Series: Earth and Environmental Science 1052, no. 1 (July 1, 2022): 012148. http://dx.doi.org/10.1088/1755-1315/1052/1/012148.

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Abstract Diaphragm (membrane) pumps refer to a class of devices with a reciprocating movement of the working body that are widely used in various industrial technologies and in everyday life. In agricultural production, these pumps are used in the production line of milking installations and for creating a vacuum in individual milking machines. The most important distinguishing feature of a diaphragm pump is the minimum mechanical effect on the pumped product due to the excluded action of centrifugal forces, which in turn excludes mechanical impact and foaming. Therefore, they are mainly used for delicate pumping of products, in particular milk. Another important feature of the pump design is its tightness that serves as a reliable barrier to isolate the working and external environments. A significantly smaller number of rubbing parts in comparison with centrifugal pumps ensures higher reliability and minimum maintenance. Analysis of modern designs of diaphragm pumps showed that their productivity and operational reliability can be improved as follows: two-chamber version; the increased usable volume of the chamber due to the diaphragm structuring; electric drive of the working body. The team of authors substantiated the design of a two-chamber milk pump with an electromagnetic drive, substantiated its supply to ensure stable operation of the milking installation throughout the entire milking time, and calculated the effect of the structured diaphragm diameter on the pump flow. The laboratory bench of the Department of Machines and Technologies of Agro-industrial Complex, Stavropol State Agrarian University, was used for experimental studies, and the estimated payback period for the developed pump design was found not to exceed 1.2...1.5 years.

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Deng, Hongying, Yi Liu, Ping Li, and Shengchang Zhang. "Hybrid model for discharge flow rate prediction of reciprocating multiphase pumps." Advances in Engineering Software 124 (October 2018): 53–65. http://dx.doi.org/10.1016/j.advengsoft.2018.08.006.

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Rudolf, Jeffrey J., Ted R. Heidrick, Brian A. Fleck, and V. S. V. Rajan. "Optimum Design Parameters for Reciprocating Pumps Used in Natural Gas Wells." Journal of Energy Resources Technology 127, no. 4 (April 12, 2005): 285–92. http://dx.doi.org/10.1115/1.2000274.

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Experimental and theoretical investigation of a recently patented down-hole direct-acting reciprocating pump system is presented. The technology, (US Patent No. 5,860,795) consists of operating a gas well with gas and liquid phases being produced separately by using the gas phase to power a pump to bring the liquid phase to the surface. This would increase the duration of profitability of many gas wells in North America. Experiments and modeling were used to determine optimum design parameters to maintain flow at a minimum reservoir pressure; an optimum area ratio for the gas/liquid pistons is approximately 40. The effect of friction in the pumping system was predicted to have a small effect on this optimum design. The results of this investigation will now be used to design and construct a prototype for field testing.

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Du, Shanxiao, Jichao Hong, Hongxin Zhang, Qinghai Zhao, Tiezhu Zhang, Xiaoming Xu, and Xiaotian Jiang. "Research on Cavitation of the Rotating-Sleeve Distributing Flow System Considering Different Cam Groove Profiles." Energies 14, no. 8 (April 11, 2021): 2139. http://dx.doi.org/10.3390/en14082139.

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Reciprocating piston pumps are widely used in various fields, such as automobiles, ships, aviation, and engineering machinery. Conventional reciprocating piston pump distributing flow (RPPDF) systems have the disadvantages of a loose structure and low volumetric efficiency, as well as affected positively by the operating frequency. In this paper, a novel rotating-sleeve distributing flow (RSDF) system is presented for bridging these drawbacks, as well as structurally improved to overcome the inoperable and challenging problems in oil intake and discharge found in the experiment. Moreover, the Singhal cavitation model specifically for the RSDF system and four-cam groove profiles (CGPs) is established. To find the most suitable CGP to reduce the RSDF’s cavitation, the cavitation of the RSDF system was investigated, combining with simulations by taking into account the gap among the rotating sleeve, the pump chamber, and experiments on four presented CGPs. Simulation results based on vapor volume fraction, cavitation ratio, and volumetric efficiency show that the linear profile’s cavitation is the weakest. Finally, the correctness of the simulation is verified through orthogonal experiments. This research is of great significance to the further development of the RSDF system; more important, it has great potential to promote the reform of the RPPDF method.

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Farrant, J. L., and E. Bez. "Oil-Free Forepumps for Electron Microscopes." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 1 (August 12, 1990): 186–87. http://dx.doi.org/10.1017/s0424820100179683.

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Even the best present day ultrahigh resolution electron microscopes embody a paradox. They are equipped with the most modern ion pumps, cryopumps or turbomolecular pumps, but the forepumps are oil-sealed rotary pumps invented by Gaede in 1905. Consequently efficient protective systems are necessary to prevent oil-derived vapour from contaminating the specimen, the objective lens aperture diaphragm, the field emission or lanthanum boride electron sources and other sensitive areas. Continuously operable, reciprocating, dry fore-vacuum pumps, based on our designs, have been made and sold by Varian for over three years and have proved reliable in a wide range of equipment. Electron microscopes too, should be provided with oil-free forepumps.The need for oil-free forepumps occurred to one of us in 1949 when it was shown that pump oil was the major source of the carbonaceous contamination of microscope specimens and objective lens diaphragms. Materials available at that time seemed unsuitable for the construction of oil-free forepumps but during 1968 we learnt that highly wear resistant, low-friction composites of polytetrafluoroethylene (PTFE) filled with finely divided bronze, graphite, etc. were being marketed. In 1970 we began to devise a practical oil-free pump. Rotary designs were rejected because all practicable shaft seals require oil lubrication to transfer heat from the seal to the shaft to prevent the seal material from reaching temperatures at which it would soften and wear rapidly. Each lubricated shaft seal would expose, at least, a narrow annulus of oil to the vacuum in the working chamber and seal wear would lead to substantial leakage of oil.

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Qiu, Nanbin, Xianwei Shang, Ruimin Liu, Ping Jin, and Wanli Gao. "Analysis of the Dynamic Characteristics of the Pump Valve System of an Ultra-High Pressure Liquid Hydrogen Reciprocating Pump." Energies 15, no. 12 (June 9, 2022): 4255. http://dx.doi.org/10.3390/en15124255.

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This paper developed a 3D physical model of the hydraulic end of a high-pressure liquid hydrogen reciprocating pump to research the dynamic characteristics of the pump valve system. Based on dynamic mesh technology, we analyzed the coupling characteristics of pump valve and plunger motion and spool force considering the leakage model, closure model of valve gap, and compressibility of liquid hydrogen. Further, we analyzed the effect of the spring stiffness and preload force on the laws of motion of the pump valve. Finally, a liquid hydrogen pressurization test was conducted to revise the simulation model and verify the accuracy of the simulation. The results of the simulation and test show that the simulation method in this paper can simulate the liquid hydrogen pressurization process more accurately and obtain the motion law of the suction and discharge valves. Both the suction and discharge valves have an opening hysteresis angle of about 40°, and there is a strong coupling relationship between the spool motion and the piston motion and forces. The greater the preload force of the suction valve, the more obvious the oscillation effect of the suction valve. As the preload of the discharge valve increases, the opening hysteresis angle of the discharge valve increases significantly and the closing hysteresis angle decreases. The results of the research can provide some useful reference for the design of pump valves of high-pressure liquid hydrogen reciprocating pumps.

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Hashimoto, Hiroyuki, Hirokuni Hiyama, and Rokuro Sato. "Development of Prototype Pump Using a Vibrating Pipe With a Valve." Journal of Fluids Engineering 116, no. 4 (December 1, 1994): 741–45. http://dx.doi.org/10.1115/1.2911844.

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Tests were conducted on a prototype pump which has an extremely simple structure and excellent controllability. Its structural and hydrodynamic features are different from those of previous conventional reciprocating pumps. The pump structure constitutes a leak-proof short vibrating pipe equipped with a nonreturn valve on the edge of its outlet. The authors developed a prototype pump which uses a 25 mm diameter vibration pipe and an electromagnetic excitation device. The pump performance, intentionally changed by adjusting the coil voltage or the coil current frequency, featured a maximum pressure of approximately 1.0 bars, a maximum flow rate of approximately 40 liters per minute, and a maximum efficiency of approximately 30 percent. Results of both a one-year test run, using water as the working medium, and a three-month durability test, using concentrated nitric acid as the working fluid, assuming application as a chemical pump, indicated favorable results.

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Mathew, Sathyajith, and K. P. Pandey. "Modelling the Integrated Output of Mechanical Wind Pumps." Journal of Solar Energy Engineering 122, no. 4 (August 1, 2000): 203–6. http://dx.doi.org/10.1115/1.1319498.

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A method for predicting output of simple multi-bladed windmill mechanically coupled to a reciprocating pump is proposed. The present method adopts an integrated approach by considering the interaction between the rotor, pump and the wind regime to model the wind pump discharge. The wind velocity-power relationship of the rotor is assumed to be quadratic. The wind regime is characterized by the Raleigh distribution. Differences in the starting and running torque requirements of the pump are also considered in the model. Wind data from a few potential sites from the southern part of India were analyzed and the expected outputs at these sites were predicted using the proposed method. [S0199-6231(00)00603-1]

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Opitz, K., and E. Schlücker. "Detection of Cavitation Phenomena in Reciprocating Pumps using a High-Speed Camera." Chemical Engineering & Technology 33, no. 10 (July 23, 2010): 1610–14. http://dx.doi.org/10.1002/ceat.201000204.

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Mok, S. H., and D. G. Gorman. "Using Taguchi Experimental Design to Investigate Operating Variables That Significantly Affect Wear in Mud Pumps." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 209, no. 1 (March 1995): 29–40. http://dx.doi.org/10.1243/pime_proc_1995_209_403_02.

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Maintenance of offshore drilling mud pumps is normally based on running hours. It is generally accepted, however, that time does not provide an accurate means of scheduling maintenance, given the varying operating conditions of the reciprocating mud pumps. The energy expended at the interaction of sliding surfaces is hypothesized to be a better alternative. The effects of operating variables on wear rates are investigated. A Taguchi experimental design was used to identify those factors that significantly affect wear. Within the confines of an experimental test rig, the normal load and abrasive sand content was found to have a significant effect on the specific wear rate of nitrile rubber sliding on steel in drilling fluid.

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Menkara, Adam, Ahmad Faryami, Daniel Viar, and Carolyn Harris. "Applications of a novel reciprocating positive displacement pump in the simulation of pulsatile arterial blood flow." PLOS ONE 17, no. 12 (December 13, 2022): e0270780. http://dx.doi.org/10.1371/journal.pone.0270780.

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Pulsatile arterial blood flow plays an important role in vascular system mechanobiology, especially in the study of mechanisms of pathology. Limitations in cost, time, sample size, and control across current in-vitro and in-vivo methods limit future exploration of novel treatments. Presented is the verification of a novel reciprocating positive displacement pump aimed at resolving these issues through the simulation of human ocular, human fingertip and skin surface, human cerebral, and rodent spleen organ systems. A range of pulsatile amplitudes, frequencies, and flow rates were simulated using pumps made of 3D printed parts incorporating a tubing system, check valve and proprietary software. Volumetric analysis of 430 total readings across a flow range of 0.025ml/min to 16ml/min determined that the pump had a mean absolute error and mean relative error of 0.041 ml/min and 1.385%, respectively. Linear regression analysis compared to expected flow rate across the full flow range yielded an R2 of 0.9996. Waveform analysis indicated that the pump could recreate accurate beat frequency for flow ranges above 0.06ml/min at 70BPM. The verification of accurate pump output opens avenues for the development of novel long-term in-vitro benchtop models capable of looking at fluid flow scenarios previously unfeasible, including low volume-high shear rate pulsatile flow.

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Yeh, Chung Wei. "An Integrated Multimedia Learning System for Reciprocating Internal Combustion Engines: RICEM." Advanced Materials Research 213 (February 2011): 211–15. http://dx.doi.org/10.4028/www.scientific.net/amr.213.211.

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A cost-effective multimedia learning system, RICEM, for reciprocating internal combustion engines was proposed in this study. This system contained the graphical introduction of engine components, engine structure animation, feedback and assessment based on Mayer’s multimedia learning cognitive theory. Reciprocating internal combustion engines are used all over the world to drive compressors, pumps, electric generators, motor ships and other equipments. We used multimedia software to construct the learning system. An experiment comprising of two groups of 30 participants separately was conduct to test the effectiveness and showed that there was a significant difference between the pre-test and post-test score in the RICEM group, as compared with the control group. This study suggested that a collaborative application appeared to be promising in supporting effective learning of modern technology, by combining the integration of learning theory and multimedia design.

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Yeh, Chung Wei, and Kee Rong Wu. "An Integrated Multimedia Learning System for Reciprocating Internal Combustion Engines: RICEM." Applied Mechanics and Materials 39 (November 2010): 91–96. http://dx.doi.org/10.4028/www.scientific.net/amm.39.91.

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A cost-effective multimedia learning system, RICEM, for reciprocating internal combustion engines was proposed in this study. This system contained the graphical introduction of engine components, engine structure animation, thermal theory, feedback and assessment based on Mayer’s multimedia learning cognitive theory. Reciprocating internal combustion engines are used all over the world to drive compressors, pumps, electric generators, motor ships and other equipments. We used multimedia software to construct the learning system. An experiment comprising of two groups of 30 participants separately was conduct to test the effectiveness and showed that there was a significant difference between the pre-test and post-test score in the RICEM group, as compared with the control group. This study suggested that a collaborative application appeared to be promising in supporting effective learning of modern technology, by combining the integration of learning theory and multimedia design.

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Zhi-hua, ZHAO. "Fault Diagnosis Technology of Reciprocating Pumps based on Inlay Model Wavelet Neural Network." IOSR Journal of Engineering 07, no. 04 (May 2017): 43–47. http://dx.doi.org/10.9790/3021-0704014347.

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MBIGHA, C. C., and C. NALLURI. "A MICROCOMPUTER-ASSISTED MEASUREMENT SYSTEM FOR LABORATORY EVALUATION OF RECIPROCATING WATER-LIFT PUMPS." Proceedings of the Institution of Civil Engineers - Water Maritime and Energy 101, no. 3 (September 1993): 183–90. http://dx.doi.org/10.1680/iwtme.1993.24583.

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Dongaonkar, Ranjeet M., Christopher M. Quick, Jonathan C. Vo, Joshua K. Meisner, Glen A. Laine, Michael J. Davis, and Randolph H. Stewart. "Blood flow augmentation by intrinsic venular contraction in vivo." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 302, no. 12 (June 15, 2012): R1436—R1442. http://dx.doi.org/10.1152/ajpregu.00635.2011.

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Venomotion, spontaneous cyclic contractions of venules, was first observed in the bat wing 160 years ago. Of all the functional roles proposed since then, propulsion of blood by venomotion remains the most controversial. Common animal models that require anesthesia and surgery have failed to provide evidence for venular pumping of blood. To determine whether venomotion actively pumps blood in a minimally invasive, unanesthetized animal model, we reintroduced the batwing model. We evaluated the temporal and functional relationship between the venous contraction cycle and blood flow and luminal pressure. Furthermore, we determined the effect of inhibiting venomotion on blood flow. We found that the active venous contractions produced an increase in the blood flow and exhibited temporal vessel diameter-blood velocity and pressure relationships characteristic of a peristaltic pump. The presence of valves, a characteristic of reciprocating pumps, enhances the efficiency of the venular peristaltic pump by preventing retrograde flow. Instead of increasing blood flow by decreasing passive resistance, venular dilation with locally applied sodium nitroprusside decreased blood flow. Taken together, these observations provide evidence for active venular pumping of blood. Although strong venomotion may be unique to bats, venomotion has also been inferred from venous pressure oscillations in other animal models. The conventional paradigm of microvascular pressure and flow regulation assumes venules only act as passive resistors, a proposition that must be reevaluated in the presence of significant venomotion.

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Blank, D. A., and C. Wu. "Cooling and heating rate limits of a reversed reciprocating ericsson cycle at steady state." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 214, no. 1 (February 1, 2000): 75–85. http://dx.doi.org/10.1243/0957650001537877.

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The optimal cooling and heating rates for the reversed reciprocating Ericsson cycle with ideal regeneration are determined for heat pump operations. These limiting rates are based on the upper and lower thermal reservoir temperature bounds and are obtained using time and entropy minimization procedures from irreversible thermodynamics. Use is made of time symmetry (a second law constraint) to minimize cycle time. This optimally allocates the thermal capacitances of the cycle and minimizes internal cycle entropy generation. Although primarily a theoretical work, a very practical and extensive parametric study using several environmentally friendly working fluids (neon, nitrogen and helium) is included. This study evaluates the relative contributions of various system parameters to rate-optimized design. The coefficient of performance (COP), and thus the quantity of cooling or heating for a given energy input, is the traditional focus; instead this work aims at the rate of cooling or heating in heat pumps under steady state conditions and using ideal gases as their working substances. The results obtained provide additional criteria for use in the study, design and performance evaluation of employing Ericsson cycles in refrigeration, air conditioning and heat pump applications. They give direct insight into what is required in designing a reversed Ericsson heat pump to achieve maximum heating and cooling rates. The choices of working fluids and pressure ratios were found to be very significant design parameters, together with selection of regenerator and source—sink heat transfer parameters. The parameter most influencing both the heating and cooling mode COPs and the heat transfer rates was found to be the heat conductance of the thermal sink.

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Pickup, John C. "Continuous Insulin Infusion." Engineering in Medicine 15, no. 4 (October 1986): 187–90. http://dx.doi.org/10.1243/emed_jour_1986_015_051_02.

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A major new approach to the improvements of metabolic control in insulin-dependent diabetic patients is the replacement of insulin by delivery systems which simulate non-diabetic insulin secretory patterns. In the last ten years a number of open-loop, extracorporeal, portable infusion pumps have been used in research trials tasting from a few days to several years. Routine treatment by insulin pumps is now being considered. Most infusers are syringe-drivers, although peristaltic and reciprocating pumps have also been employed. All are based on a slow, basal delivery rate, supplemented by insulin boosts at meal-times. The most popular infusion route is via the subcutaneous tissue. Technological development is concentrating on miniaturisation, alarms (such as low battery state and motor over-run) and more flexible/programmable delivery rates. Attempts are in progress to ‘close the loop’ using an implanted glucose sensor. Most electrodes are amperometric or potentiometric enzyme sensors employing immobilised glucose oxidase. Encouraging in vivo results are being obtained from a novel amperometric biosensor which uses ferrocene to mediate electron transfer. The most likely implantation site is the subcutaneous tissue.

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Jalikop, Shreyas V., Bernhard Scheichl, Stefan J. Eder, and Stefan Hönig. "A New Computational Fluid Dynamics Model To Optimize Sucker Rod Pump Operation and Design." SPE Production & Operations 36, no. 02 (March 11, 2021): 359–67. http://dx.doi.org/10.2118/201285-pa.

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Summary Artificial lift systems are widely used in oil production, of which sucker rod pumps are conceptually among the simpler ones. The reciprocating movement of the plunger triggers the opening and closing of two ball valves, allowing fluid to be pumped to the surface. Their built-in ball valves are subject to long-time erosion and fail as a consequence of this damage mechanism. Understanding the principal damage mechanisms requires a thorough examination of the fluid dynamics during the opening and closing action of these valves. In this article, we present a fluid-structure interaction model that simultaneously computes the fluid flow in the traveling valve (TV), the standing valve (SV), and the chamber of sucker rod pumps during a full pump cycle. The simulations shed light on the causes of valve damage for standard and nonideal operating conditions of the pump. In particular, our simulations based on real pump operating envelopes reveal that the so-called “midcycle valve closure” is likely to occur. Such additional closing and opening events of the valves multiply situations in which the flow conditions are harmful to the individual pump components, leading to efficiency reduction and pump failure. This mechanism, hitherto unreported in the literature, is believed to constitute the primary cause of long-term valve damage. Our finite element method-based computational-fluid-dynamics model can accurately describe the opening and closing cycles of the two valves. For the first time, this approach allows an analysis of real TV speed versus position plots, usually called pump cards. The effects of stroke length, plunger speed, and fluid parameters on the velocity and pressure at any point and time inside the pump can thus be investigated. Identifying the damage-critical flow parameters can help suggest measures to avoid unfavorable operating envelopes in future pump designs. Our flow model may support field operations throughout the entire well life, ranging from improved downhole pump design to optimized pump operation or material selections. It can aid the creation of an ideal interaction between the valves, thus avoiding midcycle valve closure to drastically extend the mean time between failures of sucker rod pumps. Finally, our simulation approach will speed up new pump component development while greatly reducing the necessity for costly laboratory testing.

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Almasi, A. "A new study and model for the mechanism of process reciprocating compressors and pumps." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 224, no. 2 (March 25, 2010): 143–47. http://dx.doi.org/10.1243/09544089jpme334.

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Hong, Sung-Ho. "A New Clearance Design Method for Reciprocating Fuel Pumps of Medium-Speed Diesel Engines." Tribology Transactions 61, no. 4 (March 19, 2018): 773–83. http://dx.doi.org/10.1080/10402004.2017.1414909.

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Reddy, Narender P., Sunil K. Kesavan, and Bruce R. Costarella. "Evaluation of Oral Water Irrigation Devices." Engineering in Medicine 14, no. 3 (July 1985): 141–45. http://dx.doi.org/10.1243/emed_jour_1985_014_033_02.

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Water irrigation devices (WIDs) are widely used in homes and dental offices across the country for oral hygiene. There have been several reported cases of tissue damage with the use of these devices. In the present investigation, two commercially available oral water irrigation devices were evaluated using bioengineering principles. The flow rates delivered by these devices were measured at different control settings. The exit jet velocities and the jet impact thrust were subsequently calculated. Both of the tested commercial oral water irrigation devices were found to exert abnormally high thrust which could cause serious damage to the sulcular epithelium and the underlying tissues. These pressures are far in excess of the pressure intensity necessary to perform the cleaning action. Moreover, the existing designs using reciprocating pumps are unsafe and are potentially dangerous, particularly with small diameter tips. Low operating pressures and the use of centrifugal pumps are recommended.

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Yang, Jia. "Hydraulic Vibration Exciter and Hydraulic Circuit Design Research." Advanced Materials Research 989-994 (July 2014): 2904–7. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.2904.

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Pressure of the liquid is used as power source of hydraulic vibration exciter. Rotary directional control valve is the realization of oiling-way veversing components . The piston is reciprocated under the influence of the change of the hydraulic. The reciprocating movement of the piston is a result of fluid pressure.Working area of the piston multiplied by the pressure of the liquid is equal to the thrust of the piston.Displacement response of the vibration exciter can be simplified to the second-order vibration systems.Elastic beam is used as limit components of piston of vibration exciter,the piston vibration waveform is a sine wave .The volume of elastic beam is smaller than the volume of fluid elastic element . The hydraulic circuit is a dual pump fuel supply circuits.Pumps are used to supply rotary valve and hydraulic cylinder .Dual pumps fuel supply system is conducive to control fluid pressure and flow of the rotary valve and vibration piston.

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Ropyak, Liubomyr, and Vasyl Ostapovych. "Optimization of process parameters of chrome plating for providing quality indicators of reciprocating pumps parts." Eastern-European Journal of Enterprise Technologies 2, no. 5(80) (April 25, 2016): 50. http://dx.doi.org/10.15587/1729-4061.2016.65719.

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El-Sayed, Tamer A., and Amr A. Abdel Fatah. "Investigating the performance of reciprocating high-pressure pumps in constant recovery small RO desalination plants." DESALINATION AND WATER TREATMENT 143 (2019): 78–87. http://dx.doi.org/10.5004/dwt.2019.23550.

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Cheng, Qian, Yinshui Liu, Zhenyao Wang, Defa Wu, and Yunxiang Ma. "Dynamic failure analysis of static seals under pressure fluctuation in an ultrahigh-pressure water piston pump." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 236, no. 8 (December 22, 2021): 3950–59. http://dx.doi.org/10.1177/09544062211052024.

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For ultrahigh-pressure piston pumps, in the reciprocating action of the piston, the fretting between the static face seal and the mating surface occurs with the change of the pressure in the piston chamber. This phenomenon will seriously affect the service life of the seal ring and lead to the failure of the pump. However, the failure of static seals used to seal ultrahigh-pressures is usually studied from the directions of shear, stress, or rubber material. These studies cannot explain the failure phenomenon of the sealing ring found in our experiment. This paper analyzed the failure of the face seal ring in a piston pump with a maximum pressure of 120 MPa. A two-dimensional axisymmetric finite element model was established based on the Mooney-Rivlin constitutive relation of the rubber material, and the fretting conditions of the sealing ring were analyzed. Combined with the wear scars observed by the scanning electron microscope the face seal ring’s dynamic failure mechanism on the ultrahigh-pressure piston pump was determined. A better sealing scheme was proposed and verified by the duration test of the pump, which provided a basis for the design of the sealing of the ultrahigh-pressure fluid with high-frequency fluctuations.

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Journal articles on the topic 'Reciprocating pumps'

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