Five-oil-port fixed differential pressure reducing valve with shuttle valve

Abstract

The five-oil-port fixed differential pressure reducing valve comprises a valve body and a valve sleeve which are matched with each other, a valve element is arranged in the valve body, a spring cavity connected with the valve element is arranged in the valve sleeve through a spring seat, and a spring used for buffering inward moving force of the valve element is arranged on the spring seat. A shuttle valve used for controlling the pressure of hydraulic oil is arranged in the valve sleeve on the side opposite to the valve body through a screw plug, a control cavity is formed in the middle of the shuttle valve and connected with four oil ports, the four oil ports are the first oil port, the second oil port, the third oil port and the fourth oil port respectively, the first oil port and the second oil port are oil conveying ports, and the third oil port and the fourth oil port are control ports. A steel ball for controlling oil pressure is arranged in the control cavity; the valve body is provided with a fifth oil port which is communicated with the spring cavity and used for measuring pressure. According to the shuttle valve, the steel ball is arranged in the control cavity in the shuttle valve to control the flow area of the first oil port and the flow area of the second oil port, and therefore the stability of the pressure of the oil outlet is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of directional pressure reducing valves, and more specifically to a five-oil-port differential pressure reducing valve with a shuttle valve. Background Art

[0002] Differential pressure reducing valve is a pressure reducing valve that makes the pressure difference between the inlet and outlet equal to or approximately constant. Its main function is to ensure that the pressure difference between the inlet and outlet oil remains basically unchanged, thereby stabilizing the pressure output of the system. It is widely used in many industrial fields.

[0003] The main function of the differential pressure reducing valve is to make the flow rate independent of the load and only related to the opening amount of the valve core. However, the existing differential pressure reducing valve is only controlled by a spring, which makes it difficult to ensure the stability of the oil outlet pressure. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a five-oil-port differential pressure reducing valve with a shuttle valve to ensure the stability of the oil outlet pressure.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present utility model are as follows.

[0006] A five-oil-port differential pressure-reducing valve with a shuttle valve comprises a matching valve body and a valve sleeve, wherein a valve core is arranged in the valve body, a spring chamber connected to the valve core is arranged in the valve sleeve through a spring seat, and a spring for buffering the inward movement force of the valve core is arranged on the spring seat; a shuttle valve for controlling the hydraulic oil pressure is arranged in the valve sleeve on the side opposite to the valve body through a screw plug, a control chamber is arranged in the middle of the shuttle valve, and four oil ports are connected to the control chamber, namely a first oil port, a second oil port, a third oil port and a fourth oil port, the first oil port and the second oil port are oil delivery ports, the third oil port and the fourth oil port are control ports, and a steel ball for controlling the oil pressure is arranged in the control chamber; a fifth oil port connected to the spring chamber for pressure measurement is arranged on the valve body.

[0007] To further optimize the technical solution, the shuttle valve includes a matching shuttle valve seat and a shuttle valve sleeve, the oil port passing through the shuttle valve seat in the control chamber is the first oil port, the oil port passing through the shuttle valve sleeve is the second oil port, and the oil ports on the left and right sides of the control chamber are the third oil port and the fourth oil port respectively.

[0008] To further optimize the technical solution, a wire retaining ring is provided between the shuttle valve seat and the shuttle valve sleeve to improve the sealing performance.

[0009] To further optimize the technical solution, a sealing ring is provided between the shuttle valve seat and the shuttle valve sleeve to improve the sealing performance.

[0010] To further optimize the technical solution, a sealing ring is provided between the valve sleeve and the screw plug to improve the sealing performance between the valve sleeve and the screw plug.

[0011] To further optimize the technical solution, the spring includes a second spring sleeved on the spring seat and a first spring sleeved on the second spring.

[0012] Due to the adoption of the above technical scheme, the technical progress achieved by the present invention is as follows.

[0013] The utility model provides a five-oil-port differential pressure reducing valve with a shuttle valve, which controls the flow area of ​​the first oil port and the second oil port by arranging a steel ball in a control cavity in the shuttle valve, thereby ensuring the stability of the oil outlet pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the shuttle valve of the utility model;

[0016] Figure 3 This is the principle diagram of the differential pressure reducing valve of the utility model.

[0017] Among them: 1. valve sleeve, 2. valve body, 3. screw plug, 4. shuttle valve, 5. valve core, 6. spring seat, 7. first spring, 8. second spring, 9. sealing ring, 10. steel ball, 11. first oil port, 12. second oil port, 13. third oil port, 14. fourth oil port, 15. fifth oil port, 16. shuttle valve seat, 17. shuttle valve sleeve, 18. wire retaining ring. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Five-port differential pressure reducing valve with shuttle valve, combined Figure 1 to Figure 2 As shown, it includes a matching valve body 2 and a valve sleeve 1, a valve core 5 is arranged in the valve body 2, a spring seat 6 and a shuttle valve 4 are arranged in the valve sleeve 1, the spring seat 6 is located at one end where the valve sleeve 1 is connected to the valve body 2, and the shuttle valve 4 is located at the other end. The shuttle valve 4 is arranged in the valve sleeve through a screw plug 3 to control the hydraulic oil pressure.

[0020] A spring cavity is provided in the valve sleeve 1 through the spring seat 6, and a spring is sleeved on the spring seat 6 to buffer the force of the valve core 5 moving inward. The spring includes a first spring 7 and a second spring 8, the second spring 8 is sleeved on the spring seat 6, and the first spring 7 is sleeved on the second spring 8. A double spring structure is adopted to ensure that the rated pressure of the valve is 31MPa in a limited spring cavity.

[0021] The shuttle valve 4 includes a matching shuttle valve seat 16 and a shuttle valve sleeve 17. A control chamber is provided in the middle of the shuttle valve 4. The control chamber is connected to four oil ports, namely a first oil port 11, a second oil port 12, a third oil port 13 and a fourth oil port 14. The oil port passing through the shuttle valve seat 16 is the first oil port 11, and the oil port passing through the shuttle valve sleeve 17 is the second oil port 12. The oil ports on the left and right sides of the control chamber are the third oil port 13 and the fourth oil port 14 respectively. A steel ball 10 is provided in the control chamber to control the oil pressure. The first oil port is connected to the valve core 5, and the second oil port is connected to the throttling hole of the valve core.

[0022] The valve body 2 is provided with a fifth oil port 15 connected to the spring chamber for pressure measurement. Figure 3 As shown, the differential pressure reducing valve has 5 oil ports: 1, 2, 3, 4, and 5. The pressure difference from port 2 to port 1 is guaranteed to be 1.1MPa. After the control oil ports 3 and 4 are compared by the shuttle valve, the higher pressure is output and acts on the valve core, and together with the spring, it offsets the hydraulic pressure of port 2 acting on the valve core, and port 5 is the control port.

[0023] A wire retaining ring 18 and a sealing ring 9 are provided between the shuttle valve seat 16 and the shuttle valve sleeve 17 , which are used to improve the sealing performance between the shuttle valve seat 16 and the shuttle valve sleeve 17 .

[0024] A sealing ring 9 is provided between the valve sleeve 2 and the screw plug 3 to improve the sealing performance between the valve sleeve 2 and the screw plug 3 bracket.

[0025] The function of the differential pressure reducing valve of the utility model is to ensure that the pressure difference between the oil in the first oil port and the second oil port remains basically unchanged. When the pressure oil enters the throttle hole of the valve core through the second oil port, the pressure drops after passing through the throttle hole, and the pressure difference is about 1.4MPa. The hydraulic oil flows out through the first oil port. When the pressure of the first oil port gradually increases, the reverse thrust phase moves to the left through the force area. While the valve core moves, the passage area of ​​the second oil port is further reduced. The pressure of the second oil inlet is relatively increased due to the reduction of the flow area, the resistance increases, and the oil pressure is relatively increased, and P is always maintained. 进油口 -P 出油口 ≈1.4MPa.

[0026] When the oil enters the shuttle valve from the second oil port or the first oil port, the side with greater pressure pushes the steel ball to move and blocks the oil port on the side with less pressure, achieving 2 / 3 or 1 / 3 access to the oil port, thereby ensuring the stability of the oil pressure.

Claims

1. Five-port differential pressure reducing valve with shuttle valve, characterized by: The invention comprises a valve body (2) and a valve sleeve (1) which are matched with each other. A valve core (5) is arranged in the valve body (2). A spring chamber connected to the valve core (5) is arranged in the valve sleeve (1) via a spring seat (6). A spring for buffering the inward movement force of the valve core (5) is arranged on the spring seat (6). A shuttle valve (4) for controlling the hydraulic oil pressure is arranged in the valve sleeve (1) on the side opposite to the valve body (2) via a screw plug (3). A control chamber is arranged in the middle of the shuttle valve (4). The control chamber is connected to four oil ports, namely a first oil port (11), a second oil port (12), a third oil port (13) and a fourth oil port (14). The first oil port and the second oil port are oil delivery ports, and the third oil port and the fourth oil port are control ports. A steel ball (10) for controlling the oil pressure is arranged in the control chamber. The valve body (2) is provided with a fifth oil port (15) which is connected to the spring chamber for pressure measurement.

2. The five-port differential pressure reducing valve with shuttle valve according to claim 1, characterized in that: The shuttle valve (4) comprises a shuttle valve seat (16) and a shuttle valve sleeve (17) which are matched with each other. The oil port in the control chamber passing through the shuttle valve seat (16) is the first oil port, the oil port passing through the shuttle valve sleeve (17) is the second oil port, and the oil ports on the left and right sides of the control chamber are the third oil port and the fourth oil port respectively.

3. The five-port differential pressure reducing valve with shuttle valve according to claim 2, characterized in that: A steel wire retaining ring (18) for improving sealing performance is provided between the shuttle valve seat (16) and the shuttle valve sleeve (17).

4. The five-port differential pressure reducing valve with shuttle valve according to claim 2, characterized in that: A sealing ring (9) for improving sealing performance is provided between the shuttle valve seat (16) and the shuttle valve sleeve (17).

5. The five-port differential pressure reducing valve with shuttle valve according to claim 1, characterized in that: A sealing ring (9) is provided between the valve sleeve (1) and the screw plug (3) to improve the sealing performance between the valve sleeve and the screw plug.

6. The five-port differential pressure reducing valve with shuttle valve according to claim 1, characterized in that: The spring comprises a second spring (8) sleeved on a spring seat (6) and a first spring (7) sleeved on the second spring (8).

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