CN-119021927-B - Control valve, hydraulic system, working machine, and hydraulic control method

CN119021927BCN 119021927 BCN119021927 BCN 119021927BCN-119021927-B

Abstract

The application provides a control valve, a hydraulic system, a working machine and a hydraulic control method. The control valve comprises a valve body, a valve core, a fluid channel and a fluid channel, wherein the valve cavity is arranged in the valve body, fluid inlet holes and fluid outlet holes which are arranged in a staggered mode are formed in the valve body along the circumferential direction, the valve core is arranged in the valve cavity in a sliding mode, the outer wall surface of the valve core is attached to the inner wall surface of the valve body, the valve core is provided with the fluid channel and is used for communicating the fluid inlet holes and the fluid outlet holes, when the valve core moves to one side, one of the fluid inlet holes and the fluid outlet holes is communicated with the fluid channel, and the other one of the fluid inlet holes and the fluid outlet holes is gradually staggered with the fluid channel. When different load demands are met, the opening states of the fluid inlet hole and the fluid outlet hole are changed by controlling the valve core to move back and forth, so that the proportional control of the flow of the fluid is formed, and finally the regulation control of the pressure and the flow of the fluid is realized.

Inventors

SU GUANGYU
ZHANG WANFU
ZHANG YUNJIE

Assignees

三一汽车制造有限公司

Dates

Publication Date: 20260508
Application Date: 20240805

Claims (6)

1. A control valve, comprising: The valve body is internally provided with a valve cavity, and fluid inlet holes and fluid outlet holes which are staggered are formed in the valve body along the circumferential direction; The valve core is arranged in the valve cavity in a sliding manner, and the outer wall surface of the valve core is attached to the inner wall surface of the valve body; The valve core is provided with a fluid channel which is used for communicating the fluid inlet hole with the fluid outlet hole; When the valve core moves to one side, one of the fluid inlet hole and the fluid outlet hole is communicated with the fluid channel, and the other fluid inlet hole and the fluid outlet hole are gradually staggered with the fluid channel; the two ends of the valve core in the moving direction respectively form a first pressure chamber and a second pressure chamber with the valve body; the valve body is provided with an oil way which is respectively communicated with the first pressure chamber and the second pressure chamber; The pilot valve is arranged on the oil path and controls the oil path to inject oil into the first pressure chamber and the second pressure chamber respectively according to the load demand to form oil pressure, and the oil pressure pushes the valve core to move left and right; The control valve further comprises a displacement feedback device, wherein the displacement feedback device is used for monitoring the displacement distance of the valve core in real time; the outer wall surface of the valve core is provided with an annular groove to form the fluid channel, and the two sides of the annular groove in the moving direction are respectively provided with a first throttling edge and a second throttling edge; the first throttling edge is designed to be arc-shaped, and the second throttling edge is designed to be wavy.
2. The control valve of claim 1 further comprising an emergency device coupled to said spool for urging said spool to move.
3. The control valve of claim 2, wherein the emergency device comprises: the connecting piece is arranged in the first pressure chamber or the second pressure chamber in a sliding way, and is connected with the valve core; the pushing piece is arranged on the valve body in a sliding penetrating manner and used for pushing the connecting piece to move; and the elastic piece is arranged between the connecting piece and the valve core.
4. A hydraulic system comprising a control pressure oil source, a system pressure oil source and a control valve according to any one of claims 1 to 3; The control pressure oil source is connected with the valve core to drive the valve core to displace; the system pressure oil source is in communication with the fluid inlet port and the fluid outlet port.
5. A working machine comprising the control valve according to claim 1 to 3, or the hydraulic system according to claim 4.
6. A hydraulic control method for the work machine according to claim 5, comprising the steps of: The pilot valve and the control pressure oil source are used for controlling the displacement of the valve core, so that different opening degrees of the fluid inlet hole and the fluid outlet hole are regulated, and the proportional control of the flow and the pressure of the system pressure oil source is formed.

Description

Control valve, hydraulic system, working machine, and hydraulic control method Technical Field The application relates to the technical field of safety valves, in particular to a control valve, a hydraulic system, a working machine and a hydraulic control method. Background The unloading valve is one of the key components of the pump station system, and the main function of the unloading valve is to stabilize the working pressure of the pump within a specified pressure range. In the related art, a cone valve is generally adopted to realize loading and unloading functions of a system. However, in practical application, the scheme depends on a single switch valve operation mode, is worry-free when processing variable load and flow demands, and the system cannot dynamically adjust the opening degree of the valve according to real-time working conditions, so that the pressure control demands under different load and flow conditions are difficult to match accurately, flexibility is lacking, and the control demands of different loads and flow cannot be effectively adapted. Disclosure of Invention The present application is directed to solving at least one of the technical problems existing in the related art. To this end, a first aspect of the application consists in proposing a control valve. A second aspect of the application is directed to a hydraulic system. A third aspect of the present disclosure is directed to another work machine. A fourth aspect of the present application is to provide a hydraulic control method. In view of this, according to a first aspect of the present application, there is provided a control valve comprising a valve body having a valve cavity therein, the valve body being provided with fluid inlet and outlet ports arranged in a staggered manner in a circumferential direction. The valve comprises a valve core, a valve body, a fluid channel, a fluid inlet hole and a fluid outlet hole, wherein the valve core is arranged in a valve cavity in a sliding manner, the outer wall surface of the valve core is attached to the inner wall surface of the valve body, the fluid channel is arranged on the valve core and used for communicating the fluid inlet hole and the fluid outlet hole, when the valve core moves to one side, one of the fluid inlet hole and the fluid outlet hole is communicated with the fluid channel, and the other fluid inlet hole and the fluid outlet hole are gradually staggered with the fluid channel. In the above technical solution, when the valve core moves to one side, one of the fluid inlet hole and the fluid outlet hole is kept in communication with the fluid channel, and the other is gradually staggered from the fluid channel and is closed. When the valve is in different load demands, the opening states of the fluid inlet hole and the fluid outlet hole are changed by controlling the valve core to move back and forth, namely, the flow passing area from the fluid inlet hole to the fluid outlet hole is adjusted, the flow of the fluid is different due to the fact that the opening states of the fluid inlet hole and the fluid outlet hole of the control valve are different, proportional control on the flow of the fluid is formed, and finally, adjustment control on the pressure and the flow of the fluid is achieved. Thus, the adaptability of the control valve to multiple loads can be improved. In some technical schemes, an annular groove is arranged on the outer wall surface of the valve core to form a fluid channel, and a first throttling edge and a second throttling edge are respectively arranged on two sides of the annular groove in the moving direction. Specifically, the first throttle edge and the second throttle edge have different shape structures. Therefore, two overcurrent area curves can be formed, so that various load demands can be met, and the adaptability of the control valve to the control demands of the system flow and pressure is further improved. In the above technical solution, the first throttling edge is designed as an arc shape and/or the second throttling edge is designed as a wave shape. The arc design is favorable for realizing smoother transition of fluid when the fluid passes through the throttling edge, reduces the formation of fluid impact and vortex flow, thereby reducing energy loss and noise, and simultaneously, the corresponding flow area change curve is more predictable due to the relatively simple and continuous geometric characteristics of the arc, so that the flow and pressure can be controlled accurately. While the wave-like design provides more flow path variation, enabling the fluid to undergo multiple different cross-sectional constrictions and expansions as it passes therethrough, thereby achieving more flexible flow and pressure regulation. Therefore, in the above technical scheme, the first throttling edge is designed into an arc shape, the second throttling edge is designed into a wave shape, and two distinct overflow area curves can be