Miniature high-pressure cartridge overflow valve driven by disc spring

Abstract

The invention relates to a disc spring driven miniature high-pressure plug-in overflow valve which comprises a valve body, a disc spring seat, a valve core, a valve seat, a hydraulic sealing nut, a pressure regulating screw rod, an ED sealing ring, a steel ball, a disc spring, a sealing ring and a valve body connection control block body, and the pressure regulating screw rod is mounted in the valve body; the lower end of the pressure adjusting screw is connected with a disc spring seat through a steel ball, and the upper end of the pressure adjusting screw is connected with a hydraulic sealing nut through threads. The valve element is matched and connected with the valve seat. The overflow valve adopts a belleville spring driving plug-in mounting type structure, has a highly integrated design, effectively reduces the size and weight, drives the valve core to slightly and axially move through the belleville spring, realizes self-adaptive adjustment of system pressure, and ensures balance of internal pressure of a hydraulic system; a high-performance sealing piece is installed at the valve seat end, and effective isolation of high-pressure and low-pressure hydraulic systems is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of micro cartridge valve hydraulic pressure, in particular to a disc spring driven cartridge type micro overflow valve for high pressure, ultra-high pressure, electro-hydraulic actuator power head and other systems. Background Art

[0002] The direct-acting relief valve is a hydraulic control element that directly uses the balance between the hydraulic pressure and the spring force in the system to control the opening and closing of the valve core. The structure mainly consists of the valve body: the outer shell of the relief valve, designed with an oil inlet P and an oil outlet T; the valve core: under the action of the pressure regulating spring, it is tightly attached to the valve seat to control the flow of oil; the pressure regulating spring: provides closing force for the valve core, and the relief pressure is set by adjusting the pre-compression of the spring; the pressure regulating screw: used to manually adjust the pre-compression of the spring, thereby setting the relief pressure of the relief valve.

[0003] Under normal conditions, the valve core is pressed against the valve seat due to the action of the pressure regulating spring, so that the oil inlet P and the oil outlet T are not connected. When the system pressure reaches or exceeds the set overflow pressure, the valve core moves up and the oil flows back to the oil tank from the overflow port, thereby maintaining the stability of the system pressure.

[0004] Its main disadvantage is that direct-acting relief valves can generally only be used in low-pressure and low-flow conditions. When controlling higher pressures or larger flows, hard springs with greater stiffness are required. Compression springs cannot provide the spring force required for ultra-high pressure due to limitations such as material stiffness. However, butterfly springs can meet the requirements of ultra-high pressure for spring force due to their ultra-high stiffness coefficient.

[0005] In the field of micro cartridge valve hydraulic technology, there is an increasing demand for precise control in high and ultra-high pressure systems. These systems, especially the electro-hydraulic actuator heads, require extremely high pressure stability and response speed. This invention addresses this challenge and proposes an innovative disc spring driven relief valve solution to provide a more reliable and efficient pressure valve for high pressure hydraulic control systems. The design of this disc spring high pressure micro relief valve not only improves the performance of the system, but also expands the application range of micro cartridge valves under extreme working conditions, meeting the stringent requirements of modern industry for hydraulic components.

[0006] In view of the structural defects and practical needs of the above-mentioned compression spring type relief valve, the present invention aims to design a micro relief valve with a simple structure that can be used for high pressure and ultra-high pressure. Summary of the invention

[0007] The object of the present invention is to provide a disc spring driven cartridge relief valve with novel and compact structure, which can be used in micro high pressure or ultra-high pressure systems and electro-hydraulic actuator (EHA) power heads.

[0008] To achieve the above-mentioned purpose, the technical solution of the present invention is: a disc spring driven miniature high-pressure cartridge overflow valve, including a valve body, a disc spring seat, a valve core, a valve seat, a hydraulic sealing nut, a pressure regulating screw, an ED sealing ring, a steel ball, a butterfly spring, and a sealing ring. The valve body is connected to a control block, and a pressure regulating screw is installed in the valve body; the lower end of the pressure regulating screw is connected to the disc spring seat through a steel ball, and the upper end is connected to the hydraulic sealing nut through a thread, and the disc spring seat is connected to the valve core through a butterfly spring; the valve core is connected to the valve seat in a cooperative manner.

[0009] Furthermore, the valve core is a conical valve core structure.

[0010] Furthermore, the valve seat is provided with a high pressure port, which cooperates with the valve core.

[0011] Furthermore, the hydraulic sealing nut is used for external oil sealing of the pressure regulating screw at the valve body.

[0012] Further, a pressure regulating screw is used for manual pressure regulation;

[0013] Furthermore, the ED sealing ring is arranged between the valve body and the control block body for external low-pressure sealing isolation.

[0014] Furthermore, one end of the steel ball is embedded in the top of the disc spring seat, and the other end is connected to the pressure regulating screw to adaptively adjust the force direction.

[0015] Further, the butterfly spring is used to provide a spring force matching the high pressure at the valve seat.

[0016] Furthermore, a sealing ring is arranged between the valve seat and the control block for high and low pressure sealing and isolation.

[0017] Furthermore, the relief valve is a plug-in structure and is used for the power head of the electro-hydraulic actuator of the micro ultra-high pressure system.

[0018] The relief valve of the present invention has good pressure regulating capabilities such as micro and ultra-high pressure, and its beneficial effects are mainly reflected in the following points:

[0019] 1. Innovative structural design: The relief valve adopts a butterfly spring driven cartridge structure with a highly integrated design, effectively reducing volume and weight.

[0020] 2. Adaptive system pressure (overflow): The butterfly spring drives the valve core to make a small axial movement to achieve adaptive adjustment of the system pressure and ensure the internal pressure balance of the hydraulic system.

[0021] 3. Efficient sealing performance: The valve seat end is equipped with high-performance seals to achieve effective isolation of high and low pressure hydraulic systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the overflow valve in the present invention;

[0023] Figure 2 This is a schematic diagram of the principle of a cartridge-type relief valve;

[0024] Figure 3 It is a simplified diagram of the plug-in relief valve socket;

[0025] Figure 4 It is a diagram showing an embodiment of the present invention in an electro-hydraulic actuator; DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with embodiments and drawings.

[0027] like Figures 1 to 3 As shown, a disc spring-driven miniature high-pressure cartridge overflow valve of the present invention is mainly composed of a valve body 1, a disc spring seat 2, a valve core 3, a valve seat 4, a hydraulic sealing nut 5, a pressure regulating screw 6, an ED sealing ring 7, a steel ball 8, a butterfly spring 9, a sealing ring 10, etc.

[0028] The valve body 1 is connected to the control block and the pressure regulating screw 6 is installed; the lower end of the pressure regulating screw 6 is connected to the disc spring seat 2 through the steel ball 8, and the upper end is connected to the hydraulic sealing nut 5 through a thread; the disc spring seat 2 is connected to the valve core 3 through the butterfly spring 9; the valve core 3 is connected with the valve seat 4 in a cooperative manner.

[0029] Preferably, the valve core 3: is a conical valve core structure with stable guidance and good tightness;

[0030] Preferably, the valve seat 4 is provided with a high-pressure port, which cooperates with the valve core 3 .

[0031] Preferably, the hydraulic sealing nut 5 is used for external oil sealing of the pressure regulating screw 6 at the valve body 1;

[0032] Preferably, the pressure regulating screw 6 is used for manual pressure regulation;

[0033] Preferably, the ED sealing ring 7 is arranged between the valve body 1 and the control block for external low-pressure sealing isolation;

[0034] Preferably, the steel ball 8: one end is embedded in the disc spring seat 2, and the other end is connected to the pressure regulating screw 6, so as to adaptively adjust the force direction;

[0035] Preferably, the butterfly spring 9: provides a spring force matching the high pressure at the valve seat 4;

[0036] Preferably, the sealing ring 10 is arranged between the valve seat 4 and the control block to seal and isolate high and low pressures.

[0037] Preferably, the bottom hole P of the valve seat 4 is connected to the high pressure of the hydraulic system, and the T port of the valve body 1 is connected to the return oil overflow. When the bottom hole P of the valve seat 4 is φd = 2mm, the pressure can reach 35MPa; when the bottom hole P of the valve seat 4 is φd = 1.3mm, the pressure can reach 70MPa, and the above flow rate reaches 4L / min@10bar, 32cst.

[0038] The relief valve is a plug-in structure and is used for the power head of the electro-hydraulic actuator used in micro ultra-high pressure systems. Figure 4 As shown, the relief valve 20 of the present invention is used on the power head of an electro-hydraulic actuator.

Claims

1. A disc spring driven miniature high pressure cartridge relief valve, characterized in that: It includes a valve body, a disc spring seat, a valve core, a valve seat, a hydraulic sealing nut, a pressure-regulating screw, an ED sealing ring, a steel ball, a disc spring, and a sealing ring. The valve body is connected to a control block, and a pressure-regulating screw is installed in the valve body; the lower end of the pressure-regulating screw is connected to the disc spring seat through a steel ball, and the upper end is connected to the hydraulic sealing nut through a thread; the disc spring seat is connected to the valve core through a disc spring; the valve core is connected to the valve seat in a coordinated manner.

2. The disc spring driven miniature high pressure cartridge relief valve according to claim 1, characterized in that: The valve core is a conical valve core structure.

3. The disc spring driven miniature high pressure cartridge relief valve according to claim 1, characterized in that: The valve seat is provided with a high-pressure port, which cooperates with the valve core.

4. The disc spring driven micro high pressure cartridge relief valve according to claim 1, characterized in that: Hydraulic sealing nut, used for external oil sealing of the pressure regulating screw at the valve body.

5. The disc spring driven micro high pressure cartridge relief valve according to claim 1, characterized in that: Pressure regulating screw, used for manual pressure regulation.

6. The disc spring driven micro high pressure cartridge relief valve according to claim 1, characterized in that: The ED sealing ring is arranged between the valve body and the control block for external low-pressure sealing isolation.

7. The disc spring driven micro high pressure cartridge relief valve according to claim 1, characterized in that: One end of the steel ball is embedded in the top of the disc spring seat, and the other end is connected to the pressure regulating screw to adaptively adjust the force direction.

8. The disc spring driven micro high pressure cartridge relief valve according to claim 1, characterized in that: The butterfly spring is used to provide a spring force that matches the high pressure at the valve seat.

9. The disc spring driven micro high pressure cartridge relief valve according to claim 1, characterized in that: The sealing ring is arranged between the valve seat and the control block to seal and isolate high and low pressures.

10. The disc spring driven miniature high pressure cartridge relief valve according to any one of claims 1 to 9, characterized in that: The relief valve is a plug-in structure and is used for the power head of the electro-hydraulic actuator of a micro ultra-high pressure system.

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