Constant pressure difference valve with buffering function

Abstract

The invention discloses a constant pressure difference valve with a buffering function. The constant pressure difference valve comprises an oil inlet valve body and a constant pressure difference valve element, an oil inlet cavity, an oil return cavity and an oil drainage path are arranged in the oil inlet valve body, the oil inlet cavity can communicate with the oil return cavity, and the oil inlet cavity can further communicate with a reversing link working cavity; the constant pressure difference valve element is arranged in the oil inlet valve body in a sliding manner, the constant pressure difference valve element can block the communication position of the oil inlet cavity and the oil return cavity, and the constant pressure difference valve element communicates with the oil drainage path; and a throttling valve element is arranged at the end, close to the oil inlet cavity, of the constant pressure difference valve element. Along with movement of the constant pressure difference valve element, the movement direction of oil in the throttling valve element is opposite to that of the constant pressure difference valve element relative to the oil inlet valve body, the buffering function is achieved, the movement speed of the constant pressure difference valve element becomes small, oil in the oil inlet cavity is not completely introduced into the reversing link working cavity, after the buffering function of the throttling valve element, the action process of the constant pressure difference valve element is the process that the flow of the reversing link working cavity is gradually increased, and the instantaneous impact of the flow is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of a hydraulic system and its peripheral supporting facilities, in particular to a constant pressure differential valve with a buffer function. Background technique [0002] At present, there are more and more construction machines using load-sensing hydraulic systems on the market. As the core control element of the load-sensing system, the load-sensing multi-way valve plays a decisive role in the action execution of the whole machine. When performing actions, the output of hydraulic oil is realized through the reversing of the main spool of the multi-way valve. When the output flow is large, the initial velocity of the instantaneous action of the reversing will exceed our expected value, which will cause an impact on the whole machine, and then It will affect the performance and service life of the whole machine. [0003] For the prior art, there are roughly the following two solutions: (1) add a buffer g...

AI Technical Summary

Problems solved by technology

Compared with solution (1), this solution is easier to process and has no flow loss, but it will affect the operator's sense of control on the pilot handle, and this solution is not feasible for manual reversing multi-way valves

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