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.

Speed control for fluid powered diaphragm pumps

Abstract: A governor for fluid powered diaphragm pumps is shown and described. At least one pump member or oscillatory member moves in response to the varying pressures in the inner chambers of the diaphragm pump. Thus, each pump member or oscillatory member moves at the frequency at which the pump operates. Each pump member pumps fluid through a hydraulic circuit. The fluid flowing through the hydraulic circuit moves a flow regulator disposed in the line that provides communication between the air or power fluid supply and the main air valve or main valve with a pump. In the event the pump operates too fast or at too high a frequency, the pump member or members will pump hydraulic fluid through the circuit at a sufficient flowrate so as to move the flow regulator to a position where it reduces the flow rate of power fluid to the main valve of the pump. In the event the pump is operating too slow or at too low a frequency, the flowrate of hydraulic fluid in the circuit will consequently be reduced and the flow regulator will be biased towards an open position thereby increasing the rate of flow of power fluid to the main valve of the pump. Manual control of the flowrate through the hydraulic circuit, and therefore manual control of the flow regulator, is also provided.

Gear pump having internal bypass valve

Abstract: A continuously driven gear pump includes an internal bypass valve for selectively controlling the supply of pressurized fluid to a hydraulically actuated device. The internal bypass valve includes a movable spool which is spring-biased to a first position, wherein the flow of fluid is bypassed from the outlet port back to the inlet port, and no fluid is delivered to the actuated device. The spool has an internal passageway formed therethrough which permits a relatively small amount of fluid to pass from the outlet port back to the reservoir when the gear pump is operated in the bypass mode. To replenish this small amount of fluid which is returned to the reservoir from the outlet port, the gear pump draws a corresponding small amount of fluid to the inlet port. Thus, a small amount of fluid circulates between the gear pump and the reservoir when the gear pump is operated in the bypass mode. This circulation cools the pump without causing a significant load to be placed on the engine. The spool can be moved to a second position against the urging of the spring, wherein the entire flow of fluid is directed to the actuated device.

Vapor exhaust system

Abstract: A vapor exhaust system including a volumeter 5 to which an air pump 7 has been coupled mechanically so that the volume of a certain amount of pumped liquid corresponds to the amount of air pumped from a fuel tank. A translatory or rotary motion provides the signal to maintain this correspondence, in which case the drive shaft 10 of the volumeter 5 is coupled to the air pump which may be executed as a gear pump. If desired, the coupling may be executed as a gear transmission 22.

Design of rotor profile of internal gear pump for improving fuel efficiency

Abstract: The internal gear pump has been widely used in vehicles because of durability and downsizing, but torque and noise of rotor in the pump have been required to be improved for fuel efficiency. In this study, shape function of the rotor with multiple profiles (ellipse 1-involute-ellipse 2) was derived, and performances (flow rate, irregularity, specific sliding and pressure angle), which were related to torque and noise, were calculated by a prediction algorithm of theoretical equations. The optimal ranges of each design parameter were determined on the basis of analysis results of about 500,000 cases of rotor profiles by using the automated design and the multiple calculation programs developed. Based on the analysis results, the rotor profiles were suggested for improving fuel efficiency, and the performance tests for them were carried out for verifying the analysis.