Improved vane hydraulic pump and motor

Abstract

The invention discloses an improved blade type hydraulic pump and a motor. The improved blade type hydraulic pump and the motor comprise a rotor rotated on a transmission shaft and provided with a plurality of radial grooves, blades slipped along the radial grooves, a stator arranged outside the rotor and cooperating with the rotor, and side plates mounted at the two ends of the rotor. A high-pressure cavity and a low-pressure cavity are formed in the side plates; the top ends of the blades are contacted with the inner surface of the stator; control cavities are formed between the bottoms of the blades and the radial grooves of the rotor; in the each cycle of rotation of the rotor, the blades are slipped inside and outside along the radial grooves to cause the volume variation of lower cavities of the blades so as to form at least one volume expansion section control cavity and at least one volume shrinkage section control cavity; a leakage recovery cavity and a leakage discharge cavity are formed in the side plates; the leakage recovery cavity is communicated with the volume expansion section control cavity, and is communicated with the high-pressure cavity via a flow passage through a control valve; and the leakage discharge cavity is communicated with the volume shrinkage section control cavity, and is communicated with the high-pressure cavity through a small hole. The leakage recovery structure provided improves the volume efficiency and the performance and durability of hydraulic machines.

Description

technical field [0001] The invention relates to the technical field of hydraulic machinery, in particular to an improved vane type hydraulic machine, especially an improved vane type hydraulic pump and motor. Background technique [0002] Vane hydraulic pumps or hydraulic motors are usually composed of rotors, vanes, stators, side plates, etc. There is a certain gap between the rotor and the end faces of the side plates. Under high fluid pressure, the fluid will pass through the gap to cause fluid leakage, thus Reduces the volumetric efficiency of hydraulic machinery, resulting in wasted energy. [0003] Chinese patent literature (announcement date: June 8, 1994, announcement number: CN 2168098Y) discloses a cam rotor vane pump with a hydraulically floating side plate. Compensate the axial gap caused by wear between the rotor, the pressure side plate and the oil distribution plate to maintain a high volumetric efficiency; the flow channel in the pump body is clear, which ma...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of fluid leakage, low volumetric efficiency, and the performance and durability of the hydraulic machine cannot be further improved due to the influence of the liquid medium in the prior art, and to provide a simple structure, manufacturing Convenient, can effectively solve the problem of fluid leakage, significantly improve volumetric efficiency, and can be widely used in improved vane hydraulic pumps and motors of vane hydraulic machinery under various medium conditions

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