Three-way pressure compensator assembly

Abstract

The invention provides a three-way pressure compensator assembly. A three-way pressure compensator has two working positions. A spring cavity of the three-way pressure compensator is communicated with an LS port and a T port through a liquid resistance network and communicated with a P port through a dynamic damping hole. One end of the liquid resistance network is communicated with the T port, and the other end of the liquid resistance network is communicated with the LS port through a filter screen. A lower cavity of the three-way pressure compensator is communicated with the P port through a damping hole. The three-way pressure compensator assembly has the advantages that the half-bridge liquid resistance network, the dynamic damping hole and the oil inlet fixing damping hole are matched, stability of LS feedback pressure of the three-way pressure compensator is effectively achieved, it is guaranteed that a valve element of the three-way pressure compensator moves stably, and therefore stable flow division is achieved; the peak value of fluctuation of load pressure is effectively eliminated, pressure gains are reduced, and it is guaranteed that all actuators are stable; a quantitative load-sensitive system can achieve the functions that the flow is small when pressure is high and the flow is large when pressure is low.

Description

technical field [0001] The invention relates to a three-way pressure compensator. In particular, it relates to the three-way pressure compensator assembly of the load-sensing system of construction machinery such as wheel loaders, cranes, and small excavators. Background technique [0002] The quantitative load sensing system is widely used in construction machinery such as loaders, truck cranes and small excavators because of its energy saving and low cost. The load-sensing multi-way reversing valve is the core component of this type of load-sensing system, and the three-way pressure compensator is an essential component of this type of hydraulic control system to realize the demand distribution of the actuator flow in the quantitative load-sensing system. The three-way compensator and the load-sensing multi-way valve are used to cooperate with each other, so that the load-sensing system can realize the function of "high pressure and small flow, low pressure and large flo...

AI Technical Summary

Problems solved by technology

However, because the quantitative load sensing system realizes flow distribution on demand, it needs to consider the matching between the pilot handle and the main control valve, and the matching between the main control valve and the three-way pressure compensator. If the matching is unreasonable, the movement of the three-way compensator will inevitably be unstable. As a result, the system pressure fluctuates greatly, which leads to the vibration of the actuator and seriously affects the working performance of the main engine.

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