Gear pump with floating side plates clearance compensated by magnetic force

Abstract

The invention discloses a gear pump with floating side plates clearance compensated by magnetic force. Circular permanent magnets (6a, 6b) and circular permanent magnets (11a, 11b) are arranged on theouter end surfaces of a rear floating side plate (7) and a front floating side plate (9) respectively; arc-shaped electromagnets (1a and 1b) are symmetrically arranged at corresponding positions of the outer side of a rear pump cover (4) of the gear pump; arc-shaped electromagnets (14a and 14b) are symmetrically arranged at corresponding positions of the outer side of a front pump cover (16) of the gear pump; annular grooves are formed at the positions, making contact with the outer end surfaces of the side plates, of the rear pump cover (4) and the front pump cover (16) of the gear pump; piezoelectric crystal pressure sensors (5a and 5b) are correspondingly installed; piezoelectric crystal pressure sensors (12a and 12b) are correspondingly installed; signal output ends of the piezoelectric crystal pressure sensors (5a and 12a) are connected with an adjustment control unit (3a); signal output ends of the piezoelectric crystal pressure sensors (5b and 12b) are connected with an adjustment control unit (3b); the output end of the adjustment control units (3a) is connected with power amplifiers (2a and 2b); the output end of the adjustment control units (3b) is connected with power amplifiers (21a and 21b); and the output ends of the power amplifiers (2a), (2b), (21b) and (21a) are connected with the arc-shaped electromagnets (1a), (1b), (14a) and (14b) respectively.

Description

technical field [0001] The invention relates to a gear pump side plate end face sealing technology, which belongs to the structural improvement of an external meshing gear pump. Background technique [0002] External gear pumps are widely used as power components in agricultural machinery, construction machinery and other industries. For a long time, medium and high pressure large displacement gear pumps have mostly adopted floating side plate type axial clearance automatic compensation technology, and the side plate can be used as a shaft in the housing. When the gear pump is working, the high-pressure oil in the pressure oil chamber on the inner end surface of the side plate is led to the outer end surface of the side plate through the oil hole, and acts in the closed oil chamber formed by the ear-shaped sealing ring and the compensation force groove to generate compensation. Force Fb, the oil in the working chamber of the gear acts on the inner end face of the side plate ...

AI Technical Summary

Problems solved by technology

[0003] However, due to the excessive local pressure mutation of the gear pump side plate under multiple working conditions, the side plate wears seriously, the gap between the side plate and the gear end face increases, and the volumetric efficiency of the gear pump decreases, which seriously shortens the service life of the gear pump side plate.

Especially when the gear pump works at high temperature, high pressure and high speed, the sealing ring on the outer end face of the floating side plate is prone to deformation, which makes the compensation force less than expected and the compensation speed is slow, resulting in failure of the end face seal

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