A piston cushioning and pushing device for an electro-hydraulic actuator

Abstract

The invention discloses a piston buffer pushing device for an electrohydraulic actuator. The piston buffer pushing device comprises a piston cylinder (1). A sealing base (2) is arranged at the top ofthe piston cylinder (1). A buffer mechanism (3) is arranged under the sealing base (2). A piston rod (4) capable of moving in the axial direction of the piston cylinder (1) is arranged under the buffer mechanism (3). The buffer mechanism (3) comprises a shaft sleeve (31). The shaft sleeve (31) is fixedly connected with the piston cylinder (1). A buffer piston (32) is movably connected into the shaft sleeve (31). A flow path A (21) is formed in the sealing base (2). A flow path B (321) is formed in the buffer piston (32). An oil cavity a (5) is formed between the sealing base (2) and the bufferpiston (32). An oil cavity a (7) is formed between the buffer piston (32) and the piston rod (4). The piston buffer pushing device has the characteristics of the simple structure and prolonged service life.

Description

technical field [0001] The invention relates to an electro-hydraulic actuator, in particular to a piston buffering and pushing device for the electro-hydraulic actuator. Background technique [0002] Reciprocating compressors are positive displacement compressors widely used in oil refining and chemical industries due to their high discharge pressure and good stability. The rated displacement of the compressor is basically unchanged, but due to changes in the process flow, raw material types and market demand, the displacement of the compressor is required to be adjusted within a wide range. In order to meet the adjustment requirements of the compressor displacement, the bypass adjustment method is traditionally used. This method has the advantages of simple structure, continuous change of flow rate, constant pressure ratio of each stage, etc., but all the compression work of excess gas will be lost, and the returned gas is compressed high-temperature gas, which needs to be...

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Problems solved by technology

[0003] However, since the main function of this adjustment method is to quickly switch the oil circuit and transmit the oil pressure to the piston device to push the output displacement of the piston rod to realize the rapid opening and closing of the valve, the force generated between the push of the piston rod and the mating parts It is a rigid contact without cushioning effect, which will cause serious damage to the piston and matching parts and affect the service life of the valve

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