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.

Electrically-operated gear rotor pump

Abstract: The present disclosure is related to an improved electrically-operated gear rotor pump mainly adapted for automobile fuel injection system; a dc motor in driving connection with the pump is housed together with the pump in a unitary housing. The driving shaft of the dc motor is in coupling engagement with the gear rotor pump by means of a floating coupling device having H-shaped longitudinal cross section. The terminal end of the dc motor shaft is defined in a rectangular form so that it can be properly fitted in the correspondingly shaped groove at one end of the coupling device. The other end of the coupling device is provided with a pair of symmetric semi-circular arms which are in registry with the identically shaped grooves axially extended through the wall of the inner rotor of the gear rotor pump with a fixed shaft, which is secured to the inlet end portion of the pump by interference fit with the inner rotor rotatably mounted thereon, located therebetween. Thereby, no precise axial alignment between the driving shaft of the dc motor and the fixed shaft of the gear rotor pump is necessary, and the precision machining of the related elements can be less critically required with the production cost thereof effectively reduced. In addition, the operation noise of the pump can be greatly improved, and the pump life be enhanced at the same time.

Gear pump and liquid injection apparatus

Abstract: A gear pump includes a housing defining an accommodating chamber and a cover for sealing the accommodating chamber. The accommodating chamber accommodates a drive gear and a driven gear. Each of the drive gear and the driven gear includes an upper surface opposed to the cover and a lower surface opposed to the housing. An annular projection projects from the upper surface of the drive gear or the driven gear for contacting the seal plate. An annular projection projects from the lower surface of the drive gear or the driven gear for contacting the seal plate. The gear pump is capable of lowering the load when the drive gear and the driven gear are rotated.

Development of a Dilatometer for Measurement of the PVT Properties of a Polymer/CO2 Solution Using a Foaming Extruder and a Gear Pump

Abstract: This paper presents an innovative dilatometer that can measure the pressure-volume-temperature (PVT) properties of polymer/CO 2 solutions in a molten state. The basic rationale of the design is to determine the density (or equivalently, the specific volume) of a polymer/CO 2 solution by separately measuring the mass and volume flow rates of the solution flowing in an extruder at each temperature and pressure. A positive-displacement gear pump mounted on an extruder is used to measure the volume flow rate of the solution. A single-phase polymer/CO 2 solution is formed by injecting a metered amount of CO 2 into a polymer melt and completely dissolving it in the melt using a foam extrusion line. The temperature of solution was precisely controlled and homogenized by using the second extruder in a tandem system and a heat exchanger with a static mixer. The pressure was controlled by the rotational speed of the screw in the second extruder. In order to reduce leakage across the gear pump, the difference between the upstream and downstream pressures was minimized using a variable resistance valve attached downstream of the gear pump. The mass flow rate was measured by directly collecting the extruded polymer melt for a fixed time after degassing CO 2 . A critical set of experiments was carried out to verify the functions of the system using pure polymer melts with known PVT data. Finally, the system was used to measure the specific volume of PS/CO 2 solutions as a function of CO 2 concentration, temperature, and pressure.

Pump, in particular gear pump including ceramic gears and seal

Abstract: A gear pump having a housing with an inlet and an outlet. First and second gears are provided with meshing gear teeth. The gears are ceramic rotor gears which are journaled within the housing. A drive shaft drives the first gear in order to move it relative to the second gear, such as to pump a fluid from the inlet to the outlet of the housing. The housing includes an opening for the passage of the drive shaft and a seal surrounding the opening. The seal includes a first seal part rotating with the first gear, and a second seal part forming part of the housing. The first and second seal parts have facing sealing surfaces, are made of ceramic material and are loaded towards each other by a biasing member parallel to the drive shaft. In this way, a mechanical seal is created between the gear and the housing obviating the need for a seal between the drive shaft and the housing.

Composite clutch type multiple stage gear transmission

Abstract: PURPOSE:To prevent both reverse gear and speed change gear provided on a same input shaft from being selected simultaneously, and prevent the gears from being locked, by operating both gears in relation to each other. CONSTITUTION:When a shift lever 53 is in R shift position, a shift valve 47 closes a forward pipe path 51 and opens a reverse pipe path 52 while a reverse valve 61 is magnetized so that oil under pressure is supplied to a cylinder 44 for a reverse gear and thereby a reverse selective gear 19 engages a reverse gear 17. At this time a piston 44a in the cylinder 44 for reverse gear moves in the direction of selecting the reverse gear 17 while a piston 34a in a 1-3 shift cylinder 34 is interlocked with the piston 44a to be moved in the direction of disengaging the reverse gear 17 from a first speed gear 12 so that the reverse gear 17 and the first speed gear 12 cannot be selected simultaneously.