Internal Gear Pump

Abstract

The invention discloses an inner engaged gear pump which comprises a hollow pump body, wherein a rotatable annular inner gear ring is arranged in a pump cavity of the pump body, a driving gear engaged with the inner gear ring is arranged in the inner gear ring, the axial center of the driving gear is relatively deviated from that of the inner gear ring, a retaining pin fixedly connected with the pump body is arranged at the outer side of a biting side of an engaging part of the driving gear and the inner gear ring, a floating filler piece is arranged between the engaging part and the retaining pin, a through flow guide hole is formed in the filler piece, one end of the flow guide hole faces the engaging part while an inward concave plunger chamber is arranged at the other end of the deflector hole, a plunger capable of moving back and forth along the plunger is arranged in the plunger chamber, an inward concave pressure chamber is arranged at one end of the plunger toward the deflector hole, the cross section area of the pressure chamber is greater than that of the deflector hole, and the other end of the plunger is connected with retaining pin. The inner engaged gear pump disclosed by the invention has the beneficial effects that the inner engaged gear pump is simple in structure, convenient to process, low in manufacturing cost, convenient in spatial layout, relatively long in service life and low in noise.

Description

technical field [0001] The present invention relates to a hydraulic machine, in particular to an internal gear pump with a shim. Background technique [0002] Due to its compact structure, stable operation, no pulsation, low vibration, low noise, internal and external rotors have the same rotation, small wear, long service life, insensitive to oil pollution, no trapped oil, good self-priming, and high speed The outstanding advantages such as wide range have been more and more widely used in all walks of life. In order to solve the radial compensation problem between the shim, the inner gear ring and the driving gear in the internal gear pump, there are two commonly used schemes at present. One scheme is to set a radial floating device on the inner gear ring or the driving gear , another solution is to divide the shim into two, and set a sealing member and an elastic member between the two, and use the elastic member to ensure that the shim that is divided into two is in goo...

AI Technical Summary

Problems solved by technology

These two schemes can well solve the problem of radial fit between the spacer, the inner gear ring and the driving gear, but the former scheme is complicated in structure and difficult in space arrangement, and the manufacturing cost is relatively high. The originally small shim is divided into two parts, which greatly reduces the rigidity of the shim and shortens its service life. There is a danger of breaking during use, which may even lead to the scrapping of the inner gear ring and driving gear. Elastic parts are set between the shims divided into two, so that the shims vibrate or even resonate to make loud noise when the internal meshing gear pump is working

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