Internal gear pump applicable to water hydraulic transmission

Abstract

The invention discloses an internal gear pump applicable to water hydraulic transmission. The internal gear pump comprises a pump case, an external gear, an internal ring gear, side plates, crescent blocks and a compensation block, wherein the compensation block is arranged in an ear-like groove, one side surface of the compensation block makes contact with the internal ring gear, and a pressure storage cavity is formed by the other side surface of the compensation block and the ear-like groove of the pump body. The compensation block can move in the ear-like groove uniformly in the radial direction under the action of pressure of a liquid in the storage cavity and adaptively compensate the distance between the internal ring gear and the compensation block, so that clearance leakage in thepump can be reduced substantially. Further, leakage caused by sharp wear between the pump body and the internal ring gear of the traditional gear pump is eliminated.

Description

technical field [0001] The invention relates to an internal meshing gear pump, in particular to an internal meshing gear pump suitable for water hydraulic transmission working conditions. Background technique [0002] Modern hydraulic transmission technology is widely used in industrial production and equipment manufacturing, and pure water hydraulic transmission technology is one of the frontier directions in the field of modern hydraulic research. Since pure water has the advantages of no pollution, wide sources, and good flame retardancy, actively carrying out research and development of pure water hydraulic transmission is of great significance to energy saving, environmental protection, sustainable development and development of green hydraulic products. . [0003] In addition, with the development of household hydraulic equipment, the hydraulic system has become an inevitable trend towards water hydraulic transmission, and the biggest challenge lies in the development...

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Problems solved by technology

[0007] However, there is no better solution for the gap leakage between the internal gear pump gear and the pump body. In most current designs, a fixed gap is used between the pump body and the inner ring gear without a gap compensation device. A structural design leads to an increase in the gap leakage between the high pressure area and the low pressure area in the pump

In addition, due to the poor lubricity of pure water, it is difficult to form a lubricating film between the inner ring gear and the pump body during the rotation of the inner ring gear, resulting in increased wear of the inner ring gear and the pump body, further increasing the internal leakage of the pump

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