A plunger for a hydraulic pump that reduces flow pulsation

Abstract

The invention provides a hydraulic pump plunger for reducing flow pulsation. The hydraulic pump plunger comprises a plunger body (1), wherein a central through hole (8) which penetrates through the left side and the right side is formed in the plunger body (1); an annular cavity (5) which is distributed around the central through hole (8) is formed in the right part of the plunger body (1) in a machining way; an opening of the annular cavity (5) is located in the right end surface of the plunger body (1); a membrane (3) for sealing the annular cavity (5) is arranged at the inner side of the right part of the annular cavity (5); an oil passage (7) which is used for communicating external space with the central through hole (8) and an air passage (6) which is used for communicating the external space with the annular cavity (5) are also formed in the plunger body (1) in the machining way; the oil passage (7) and the air passage (6) are respectively provided with a one-way valve I (4) anda one-way valve II (2). According to the hydraulic pump plunger provided by the invention, a pulsation problem in a plunger movement process can be effectively solved, pressure fluctuation can be reduced, the noise can be reduced, self inertia is small, and the volume efficiency of a pump can be increased.

Description

technical field [0001] The invention relates to the technical field of design and manufacture of a hydraulic pump and a hydraulic motor, in particular to a plunger for a hydraulic pump that reduces flow pulsation. Background technique [0002] The plunger is an important component in the plunger pump, and its performance affects the quality of the plunger pump. The performance of the plunger directly affects the flow pulsation, vibration and noise of the pump. By optimizing the design of the plunger, the purpose of reducing noise can be achieved. Because the traditional plunger is solid, its own inertia is large, and its inertial force on the swash plate is also relatively large. figure 1 It is a plunger with a central cavity in the prior art. Although the problem of large inertia is solved because of the central cavity, it cannot effectively reduce the problem of frequent flow pulsation during movement. In addition, The introduction of the central cavity increases the in...

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Problems solved by technology

figure 1 It is a plunger with a central cavity in the prior art. Although the problem of large inertia is solved because of the central cavity, it cannot effectively reduce the problem of frequent flow pulsation during movement. In addition, The introduction of the central cavity increases the invalid volume, thereby reducing the volumetric efficiency of the pump and increasing the energy loss consumed on the plunger

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