An open variable pump system integrating constant pressure function and load sensing function

Abstract

The invention discloses an open type variable pump system integrating a constant function and a load sensitive function. The system comprises an open type variable pump, a filter, a hydraulic oil tank, an energy storage, a check valve, a shuttle valve, a pressure switch, an electromagnetic reversing valve, a constant-pressure reversing valve, a load-sensitive reversing valve, an execution mechanism 1 and an execution mechanism 2, wherein an oil outlet of the open type variable pump is respectively connected with an oil inlet of the check valve and an oil inlet of the load-sensitive reversing valve; an oil outlet of the check valve, the pressure switch, an oil inlet of the electromagnetic reversing valve, an oil inlet / oil outlet of the energy storage, and an oil inlet of the constant-pressure reversing valve are mutually connected; an oil outlet of the electromagnetic reversing valve and an oil outlet of the load-sensitive reversing valve are respectively connected with two inlets of the shuttle valve; an outlet of the shuttle valve is connected with a load feedback hole of the open type variable pump; an oil outlet of the constant-pressure reversing valve is connected with the execution mechanism 1; and another oil outlet of the load-sensitive reversing valve is connected with the execution mechanism 2. According to the open type variable pump system disclosed by the invention, load response requirements of two valves can be met; moreover, the structure is simple, and the manufacturing cost is low.

Description

technical field [0001] The invention relates to the field of open variable pumps, in particular to an open variable pump system integrating constant pressure function and load sensing function. Background technique [0002] Open variable pump systems can generally be divided into constant pressure systems and load sensing systems. The constant pressure system is to maintain a constant working pressure of the open variable pump, which is suitable for occasions requiring fast load response, such as hydraulic steering system, braking system, etc., and has the advantage of short response time; the load sensing system is to make the variable Large and small output flow pressure, suitable for working conditions that do not require a particularly fast load response, and has the characteristics of good energy saving. There are multiple actuators in a system, and some actuators require fast response to the load, while some actuators do not require a particularly fast response to the...

AI Technical Summary

Problems solved by technology

There are multiple actuators in a system, and some actuators require fast response to the load, while some actuators do not require a particularly fast response to the load, and at the same time, when the entire system has good energy saving requirements, it can be used alone. Neither the open variable pump system with constant pressure function nor the open variable pump system with load sensing function can meet the requirements of the entire system, and the use of two open variable pump systems will increase the complexity and cost of the system

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