Constant pressure control valve of large-flow high-pressure plunger pump

Abstract

The invention discloses a constant pressure control valve of a large-flow high-pressure plunger pump. The constant pressure control valve is characterized by comprising a valve body, a mounting base, a valve element assembly, a limiting ejector rod assembly and a pressure adjusting spring assembly, wherein a main body of the pressure adjusting spring assembly is located in the mounting base; the valve element assembly comprises a transition valve sleeve, a main sliding valve element and an inner valve element. The constant pressure control valve has the advantages that by increasing the diameter of the valve body, the diameter of the main sliding valve element in the valve body is increased, so that the response speed of the high-pressure plunger pump is increased; the inner valve element is placed in the main sliding valve element, so that the axial thrust of the main sliding valve element under the high-pressure working condition can be reduced, and the control force of the pressure adjusting spring assembly is reduced; when the diameter of the main sliding valve element is increased, the thrust for pushing the main sliding valve element can be kept unchanged by reducing the sectional area of the inner valve element, so that the adjusting force of a spring is small, and the appearance of the pressure adjusting spring assembly is compact; and when the set pressure needs to be remotely controlled and adjusted, remote pressure control over pressure oil introduced into the pressure adjusting spring assembly can be achieved only by disassembling the inner valve element in the valve element assembly.

Description

technical field [0001] The invention relates to a control valve device, in particular to a constant pressure control valve of a high-flow high-pressure plunger pump. Background technique [0002] With the development of domestic large-scale equipment, the demand for axial piston pumps to develop to high pressure and large flow is accelerating, and the application of high-pressure piston pumps with a displacement of 500 ml and above per revolution is increasing. This requires upgrading the variable control method of the high-pressure plunger pump to improve the output flow control accuracy and real-time response capability of the high-pressure plunger pump. At the same time, taking into account the indicators such as easy and reliable operation, energy saving, and noise, it meets the needs of high-end hydraulic machinery supporting hydraulic systems. High pressure plunger pump requirements. [0003] The conventional variable control methods of high-pressure plunger pumps are...

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Problems solved by technology

[0003] The conventional variable control methods of high-pressure plunger pumps are constant pressure variable, constant power variable, electric proportional control variable, hydraulic control variable control, etc. Among them, constant pressure variable is the most commonly used control method. In the system, the flow change can be set according to the output pressure of the high-pressure plunger pump; with the increase of the displacement per revolution of the high-pressure plunger pump, the diameter of the pressure cylinder increases accordingly. In order to ensure the variable response speed of the high-pressure plunger pump, the flow rate of the pressure oil also increases. It needs to be increased accordingly, however, the existing control valves have large external dimensions and the regulation ability of the control valves is not ideal.

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