Topic
Gear pump
About: Gear pump is a research topic. Over the lifetime, 7490 publications have been published within this topic receiving 38837 citations. The topic is also known as: Gear pump.
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TL;DR: In this article, a study on the internal fluid dynamic of a high-pressure external gear pump is described, where the pump has been analyzed with both numerical and experimental techniques, and the results like the volumetric efficiency, absorbed torque, and outlet pressure ripple have been compared with the experimental data.
Abstract: A study on the internal fluid dynamic of a high-pressure external gear pump is described in this paper. The pump has been analyzed with both numerical and experimental techniques. Starting from a geometry of the pump, a three-dimensional computational fluid dynamics (CFD) model has been built up using the commercial code PumpLinx®. All leakages have been taken into account in order to estimate the volumetric efficiency of the pump. Then the pump has been tested on a test bench of Casappa S.p.A. Model results like the volumetric efficiency, absorbed torque, and outlet pressure ripple have been compared with the experimental data. The model has demonstrated the ability to predict with good accuracy the performance of the real pump. The CFD model has been also used to evaluate the effect on the pump performance of clearances in the meshing area. With the validated model the pressure inside the chambers of both driving and driven gears have been studied underlining cavitation in meshing fluid volume of the pump. For this reason, the model has been implemented in order to predict the cavitation phenomena. The analysis has allowed the detection of cavitating areas, especially at high rotation speeds and delivery pressure. Isosurfaces of the fluid volume have been colored as a function of the total gas fraction to underline where the cavitation occurs.
48 citations
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01 Jan 2005
TL;DR: In this article, the authors present a numerical model for the simulation of external gear pumps based on a finite volumes framework, where each chamber presents uniform fluid proprieties and is connected with the adjoining ones by variable orifices, with the main aim of an accurate prediction of the pressure ripple at the delivery port and the calculation the flow rate time course through the pump.
Abstract: External gear pumps are the most widely employed source of power in hydraulic applications, allowing good performance and low manufacturing costs. The present paper reports the description of a numerical model for the simulation of these kind of machines, developed by the authors. The model has been implemented using the software AMESim ® , introducing new in-house C++ models, with the main aim of an accurate prediction of the pressure ripple at the delivery port and the calculation the flow rate time course through the pump. In fact the reduction of flow pulsations is one of the crucial targets in the development of these machines. The fluid dynamic model of the pump is based on a finite volumes framework: each chamber presents uniform fluid proprieties and is connected with the adjoining ones by variable orifices. The pump is described by the interaction between a fluid dynamic model, that predicts the instantaneous pressures and the flow rates between the chambers, with a geometrical sub-model for the evaluation of the actual values of the variable volumes (defined by teeth, housing, and side wear plates) and the throat areas, as functions of the shaft angular position. This paper reports a deep description of the fluid dynamic model and a comparison between its numerical results and data available from experiments, showing how a correct evaluation of the flow when the chambers expand (and oil is pushed from the supply tank) or decrease (and oil is ejected into the outlet port) allows a good prediction of the pump characteristics. The results reported in the paper show how the model can be a powerful tool for design and development of external gear pumps, e.g. it easily allows the prediction of the maximum and minimum pressure reached inside the teeth space volumes, giving important information to prevent cavitation and damages as well as to reduce the pump noise. Moreover the simulation environment easily allows the evaluation of the pump behaviour when it works in a given hydraulic system.
48 citations
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25 Aug 1972
TL;DR: In a gear pump or motor, the tooth profile of the intermeshing gears is involutely formed at least on a torque transmitting side as mentioned in this paper, while on a non-torque transmitting side it is symmetrical with that on the torque transmission side.
Abstract: In a gear pump or motor, the tooth profile of the intermeshing gears is involutely formed at least on a torque transmitting side The tooth profile of the intermeshing gears on a non-torque transmitting side is made steeper than an imaginary tooth profile which is symmetrical with that on the torque transmitting side
47 citations
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07 Oct 1991
TL;DR: In this paper, a liquid dispensing system using a microprocessor based electronic control and a positive displacement gear pump is presented, where a passive magnetic sensor is positioned adjacent the toothed periphery of a target wheel, which is mounted on the motor shaft.
Abstract: A liquid dispensing system utilizes a microprocessor based electronic control and a positive displacement gear pump to accurately meter predetermined batches of liquid pumped from a supply tank. The gear pump is driven by a reversible motor through a gear reducer, and is operative to pump a predetermined fixed volume of liquid for each revolution or fraction of revolution of the pump drive shaft. A passive magnetic sensor is positioned adjacent the toothed periphery of a target wheel, which is mounted on the motor shaft, and generates a signal representative of the amount of rotation of the pump drive shaft. The electronic control is responsive to this signal for calculating the total volume of liquid dispaced by the pump. The electronic control includes a keyboard which enables a user to preprogram the precise amount of liquid to be dispensed. The system includes a discharge hose for dispensing the liquid into a user's container, which hose is automatically primed by the system prior to the dispensing operation. The system can also be provided with a provision to "drain back" the liquid into the supply tank after the dispensing operation, and/or to recirculate liquid through the supply tank when it is desired to mix the contents thereof.
47 citations
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TL;DR: In this article, a non-linear lumped kineto-elastodynamic model for the prediction of the dynamic behaviour of external gear pumps is presented, which takes into account the most important phenomena involved in the operation of this kind of machines.
47 citations