A pilot-operated valve for high-pressure and large-flow gas on-off control

Abstract

This invention provides a pilot-operated switching valve for controlling the opening and closing of high-pressure, high-flow-rate gases. It utilizes a pilot structure to drive the sealing valve core via a pressure difference. Only electromagnetic force is needed to control the opening and closing of the pilot gas path to move the main valve core, reducing the required driving force and avoiding the structural bulkiness caused by high driving force. The electromagnetic head quickly attracts or releases the moving iron core, achieving rapid pressure relief and restoration in the pilot gas path, thereby driving the sealing valve core to move quickly, improving the switching response speed and control accuracy. The design combines a pilot-operated and spool valve structure, resulting in a compact component layout. Compared to the bulky structure of traditional direct-acting valves, it is simpler, and the assembly and disassembly of each component are convenient, reducing maintenance costs. Both the pilot structure and the spool valve structure are back-pressure type, effectively adapting to high-pressure gas environments and ensuring stable opening and closing under high pressure and high flow rates. The valve requires low driving force and low power from the electromagnetic head, reducing the risk of overheating.

Description

Technical Field

[0001] This utility model belongs to the field of fluid control valves, specifically relating to a pilot switching valve for controlling the opening and closing of high-pressure, high-flow-rate gas. Background Technology

[0002] In fields such as automated production lines and pneumatic tools, high-pressure, high-flow on / off valves are core components for controlling the on / off state and flow rate of compressed air, and are crucial for achieving high-speed, high-precision pneumatic control. Currently, traditional direct-acting valves are the main form of high-pressure, high-flow gas control in this field. They directly drive the valve core to regulate gas flow. For example, Chinese utility model patent CN206054751U discloses a high-flow direct-acting two-way valve, which uses an adjusting rod and a stepped column. After the adjusting rod is pulled, the moving iron core continues to move upward, increasing the flow rate of the air guide hole. However, under high-pressure, high-flow conditions, direct-acting valves require a large driving force to overcome fluid pressure and friction. This not only results in a large valve structure and high operating force, but also leads to high valve power due to the large driving force, making it prone to overheating. Furthermore, it suffers from slow response speed and low control accuracy, making it difficult to ensure the safe and stable operation of the pipeline system and failing to meet the actual needs for precise fluid distribution and control. Utility Model Content

[0003] To address the shortcomings of existing direct-acting valves in controlling high-pressure, high-flow-rate gases, this invention provides a pilot-operated switching valve for controlling the opening and closing of high-pressure, high-flow-rate gases. It employs a design combining a pilot-operated valve and a spool valve structure, utilizing pressure difference to drive the valve core, thus reducing the required driving force. This avoids the problems of large valve structure, excessive power, and overheating caused by high driving force. Simultaneously, it improves the valve's response speed and control accuracy, ensuring rapid and precise on / off control of fluids under high-pressure, high-flow-rate conditions.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A pilot-operated switching valve for controlling the opening and closing of high-pressure, high-flow-rate gas, comprising:

[0006] The lower valve seat and the upper valve seat are fixedly connected to each other, and a pressure chamber is formed between the two;

[0007] The sealing valve core component is slidably disposed in the pressure chamber, and a sealing spring is provided between it and the upper valve seat;

[0008] The sleeve assembly is installed on the upper valve seat and forms a pilot cavity between the sleeve assembly and the upper valve seat;

[0009] The moving iron core component is slidably disposed in the pilot cavity, and a pilot sealing spring is provided between it and the bushing assembly;

[0010] The electromagnetic head, fitted onto the outer wall of the bushing assembly, is used to generate electromagnetic force to attract and move the moving iron core component.

[0011] The lower valve seat is provided with a main air inlet and a main air outlet, both of which are connected to the pressure chamber; the sealing valve core component is sealed at the connection between the main air outlet and the main air inlet and the pressure chamber by the elastic force of the sealing spring.

[0012] The upper valve seat is provided with: a first pilot air inlet hole connecting the main air inlet and the pilot cavity, a second pilot air inlet hole connecting the pilot cavity and the pressure cavity, and a pilot air outlet hole connecting the pilot cavity and the main air outlet; the moving iron core component is sealed at the connection port between the pilot air outlet hole and the pilot cavity under the elastic force of the pilot sealing spring.

[0013] Furthermore, a connecting hole is provided on the upper valve seat. One end of the first pilot air inlet is connected to the main air inlet, and the other end is connected to the pilot cavity through the connecting hole. The diameter of the connecting hole is smaller than the diameter of the first pilot air inlet.

[0014] Furthermore, the entire port of the main air outlet is connected to the pressure chamber, and a portion of the port area of ​​the main air inlet is connected to the pressure chamber.

[0015] Furthermore, the sealing valve core component includes a sealing valve core and a sealing plate embedded in the groove on the end face of the sealing valve core. The sealing plate is used to seal the entire port of the main air outlet and the part of the port that connects the main air inlet and the pressure chamber.

[0016] Furthermore, the sealing plate is made of rubber.

[0017] Furthermore, a guide band is provided between the outer wall of the sealing valve core and the inner wall of the upper valve seat. The guide band is embedded in the groove of the side wall of the sealing valve core and is used to guide the sliding of the sealing valve core in the pressure chamber.

[0018] Furthermore, the moving iron core component includes a moving iron core and a pilot seal embedded in a groove on the end face of the moving iron core.

[0019] Furthermore, a first O-ring for sealing the main air outlet connection surface and a second O-ring for sealing the main air inlet connection surface are respectively embedded in the groove on the end face of the lower valve seat.

[0020] Furthermore, the lower valve seat and the upper valve seat are fixedly connected by several sets of washers and screws, and a third O-ring is provided on the connection surface between the two for sealing.

[0021] Furthermore, a fourth O-ring is provided on the connection surface between the sleeve assembly and the upper valve seat for sealing, and the fourth O-ring is embedded in the side wall groove of the sleeve assembly.

[0022] The beneficial effects of this utility model include:

[0023] This valve employs a design combining a pilot-operated and a spool valve structure. It drives the sealing valve core via pressure difference, requiring only the electromagnetic force generated by the solenoid head to control the opening and closing of the pilot air path, thus significantly reducing the required driving force. This effectively avoids the structural bulkiness caused by the high driving force of traditional direct-acting valves. Furthermore, the reduced driving force lowers the power requirement of the solenoid head, minimizing overheating. The valve achieves rapid pressure relief and restoration of the pilot air path through the rapid adsorption or release of the moving iron core by the solenoid head, thereby driving the sealing valve core to move quickly. This improves the valve's response speed and control accuracy, overcoming the shortcomings of slow response and low control accuracy in traditional direct-acting valves. Its compact structure and convenient component assembly and disassembly make it easier to maintain compared to traditional direct-acting valves. Both the pilot and spool valve structures are back-pressure type, effectively adapting to high-pressure and high-flow conditions. Combined with a multi-seal design, it reduces leakage risk and enhances the valve's operational stability and reliability in high-pressure and high-flow environments, ensuring the safe and stable operation of pipeline systems and meeting the needs of automated production lines, pneumatic tools, and other fields for efficient and precise control of high-pressure and high-flow gases. Attached Figure Description

[0024] Figure 1 This is a top view of the overall structure of this utility model;

[0025] Figure 2 yes Figure 1 AA cross-section view;

[0026] Figure 3 This is a side view of the overall structure of this utility model;

[0027] Figure 4 This is a cross-sectional view of the overall structure of Embodiment 2 of this utility model.

[0028] In the diagram: 1. Lower valve seat; 2. First O-ring; 3. Second O-ring; 4. Third O-ring; 5. Pilot O-ring; 6. Upper valve seat; 7. Plug; 8. Fourth O-ring; 9. Sleeve assembly; 10. Solenoid head; 11. Nut; 12. Loosening washer; 13. Moving iron core; 14. Pilot sealing spring; 15. Pilot sealing; 16. Screw; 17. Washer; 18. Sealing spring; 19. Guide band; 20. Sealing valve core; 21. Sealing plate; 22. Main air inlet; 23. Main air outlet; 24. First pilot air inlet; 25. Second pilot air inlet; 26. Pilot air outlet; 27. Connecting hole; 28. Sealing ring. Detailed Implementation

[0029] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish components and should not be construed as indicating or implying relative importance.

[0031] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] Example 1: Reference Figure 2 A pilot switch valve for controlling the opening and closing of high-pressure, high-flow gas has a lower valve seat 1 and an upper valve seat 6 fixed together by two sets of washers 17 and screws 16, forming a pressure chamber between them, and a third O-ring 4 is provided on the middle connecting surface to achieve a sealing effect.

[0033] The lower valve seat 1 has a main air inlet 22 and a main air outlet 23, respectively. The entire port of the main air outlet 23 is connected to the pressure chamber, and a portion of the port area of ​​the main air inlet 22 is connected to the pressure chamber. A first O-ring 2 for sealing the connecting surface of the main air outlet 23 and a second O-ring 3 for sealing the connecting surface of the main air inlet 22 are respectively embedded in the groove on the lower end face of the lower valve seat 1.

[0034] A rubber sealing plate 21 is bonded to the groove on the lower end face of the sealing valve core 20 through a vulcanization process. The sealing valve core component formed by the two is slidably disposed in the pressure chamber. A guide band 19 is provided between the outer wall of the sealing valve core 20 and the inner wall of the upper valve seat 6. The guide band 19 is embedded in the groove on the side wall of the sealing valve core 20 to guide the sliding of the sealing valve core 20 in the pressure chamber. A sealing spring 18 is provided between the upper part of the sealing valve core 20 and the upper valve seat 6. The sealing spring 18 is placed in the groove on the upper end face of the sealing valve core 20. The spring force of the sealing spring 18 seals the sealing plate 21 on the entire port of the main air outlet 23 and the part of the main air inlet 22 that connects to the pressure chamber, forming a normally closed slide valve structure. This structure is a back pressure type.

[0035] The sleeve assembly 9 is tightened and installed on the top of the upper valve seat 6, forming a pilot cavity between the sleeve assembly 9 and the upper valve seat 6. A fourth O-ring 8 is provided on the connecting surface between the sleeve assembly 9 and the upper valve seat 6 to seal the gap after the sleeve assembly 9 is tightened to the upper valve seat 6. The fourth O-ring 8 is embedded in the groove on the side wall of the sleeve assembly 9. The moving iron core component, consisting of a moving iron core 13 and a pilot seal 15 embedded in the groove on the lower end face of the moving iron core 13, is slidably disposed in the pilot cavity; a pilot seal spring 14 is provided between the moving iron core 13 and the sleeve assembly 9, and the pilot seal spring 14 is fitted on the lower outer wall of the moving iron core 13; the electromagnetic head 10 is fitted on the outer wall of the sleeve assembly 9 and fixed on the sleeve assembly 9 by anti-loosening washers 12 and nuts 11, and is used to generate electromagnetic force to attract the moving iron core component to move: after the electromagnetic head 10 is energized, it generates electromagnetic force to attract the moving iron core 13 to move; after the power is turned off, the moving iron core 13 is reset by the pilot seal spring 14, so as to realize the sliding of the moving iron core 13 in the sleeve assembly 9.

[0036] The upper valve seat 6 is provided with a first pilot air inlet 24, a second pilot air inlet 25, a pilot air outlet 26, and a connecting hole 27. One end of the first pilot air inlet 24 is connected to the main air inlet 22, and the other end is connected to the pilot cavity through the connecting hole 27. The diameter of the connecting hole 27 is smaller than the diameter of the first pilot air inlet 24. The second pilot air inlet 25 is connected between the pilot cavity and the pressure cavity. The pilot air outlet 26 is connected between the pilot cavity and the main air outlet 23. The pilot seal 15 is sealed at the connecting port between the pilot air outlet 26 and the pilot cavity by the spring force of the pilot sealing spring 14, forming a normally closed pilot valve structure. This structure is a back pressure type.

[0037] Since both the pilot valve and the spool valve are back pressure type, they can achieve opening and closing of high-pressure gas.

[0038] For more details, please refer to [link / reference]. Figure 2 The pilot air outlet 26 on the upper valve seat 6 communicates with the main air outlet 23 through a transition hole on the lower valve seat 1. Based on this configuration, a pilot air O-ring 5 is also provided on the connecting surface between the lower valve seat 1 and the upper valve seat 6 to seal the mating point between the pilot air outlet 26 and the aforementioned transition hole. The screw plug 7 seals the process hole for machining the pilot air passage on the upper valve seat 6.

[0039] Based on the above structural design, the working principle of this pilot-operated switching valve is as follows:

[0040] In its initial state, under the elastic force of the sealing spring 18, the sealing plate 21 of the sealing valve core component tightly seals the main air outlet 23 and the main air inlet 22 of the lower valve seat 1, which are connected to the pressure chamber, forming a normally closed slide valve structure. Simultaneously, under the elastic force of the pilot sealing spring 14, the pilot sealing plate 15 of the moving iron core component seals the pilot air outlet 26 of the upper valve seat 6, which is connected to the pilot chamber, forming a normally closed pilot valve structure. Both the slide valve structure and the pilot valve structure are back pressure type. When the electromagnetic head 10 is energized, the generated electromagnetic force attracts the moving iron core 13 to move upward and compress the pilot sealing spring 14, causing the pilot seal 15 to disengage from the sealing surface of the pilot air outlet 26. At this time, the gas in the pilot chamber communicates with the main air outlet 23 through the pilot air outlet 26 and the transition hole of the lower valve seat 1 to achieve pressure relief. The pressure chamber decreases due to the pressure relief of the pilot chamber, and the gas pressure in the main air inlet 22 pushes the sealing valve core 20 to slide upward against the elastic force of the sealing spring 18 (guide belt). 19 guides its sliding motion, causing the sealing plate 21 to disengage from the main air outlet 23 and the main air inlet 22, which are connected to the pressure chamber. This allows the main air inlet 22 to be directly connected to the main air outlet 23, achieving a large flow output. When the electromagnetic head 10 is de-energized, the electromagnetic force disappears, the pilot sealing spring 14 resets, and pushes the moving iron core 13 downward, causing the pilot sealing 15 to re-seal the pilot air outlet 26, closing the pilot air path. The pilot chamber pressure passes through the main air inlet 22 and the first pilot air inlet 24. As the connecting hole 27 gradually recovers, the pressure in the pressure chamber also rises by seeping in through the gap between the second pilot air inlet 25 and the guide band 19 and the upper valve seat 6. Under the combined action of the sealing spring 18 and the gas pressure in the pressure chamber, the sealing valve core 20 moves down, and the sealing plate 21 re-seals the connection between the main air outlet 23 and the main air inlet 22 and the pressure chamber. The valve returns to its initial normally closed state. Since both the pilot valve and the slide valve are back pressure type, stable opening and closing control of high-pressure gas is achieved.

[0041] Based on this, compared with traditional direct-acting valves, the pilot-operated switching valve for high-pressure, high-flow-rate gas opening and closing control of this application has the following advantages:

[0042] It requires less driving force and does not need to overcome the direct pressure and friction of high-pressure, high-flow fluids. Traditional direct-acting valves require a large driving force to counteract fluid pressure and friction, while this valve uses a pilot structure to drive the sealing valve core by pressure difference. Only electromagnetic force is needed to control the opening and closing of the pilot air path to drive the main valve core, which greatly reduces the driving force requirement and avoids the problem of large structure caused by large driving force.

[0043] Faster response and higher control precision. Traditional direct-acting valves have slow response and low control precision due to the need to overcome large loads; this valve uses a solenoid head to quickly attract or release the moving iron core, realizing rapid depressurization and pressure recovery in the pilot air circuit, which in turn drives the sealing valve core to move quickly, improving the switching response speed and control precision.

[0044] The structure is simpler and easier to maintain. This valve adopts a design that combines pilot-operated and spool valve structures, with a compact component layout. Compared with the bulky structure of traditional direct-acting valves, it is simpler, and the assembly and disassembly of each component are convenient, resulting in lower maintenance costs.

[0045] With superior stability, this valve is suitable for high-pressure and high-flow-rate conditions. Both the pilot and spool structures of this valve are back-pressure type, which can effectively adapt to high-pressure gas environments and ensure stable opening and closing actions under high pressure and high flow rates. At the same time, multiple O-ring seals reduce the risk of leakage, further improving operational stability and avoiding the instability problems that may be caused by the large structure and heavy load of traditional valves.

[0046] It can reduce power consumption and overheating. Traditional direct-acting valves have high power consumption due to high driving force, which is prone to overheating; this valve has low driving force and low power required by the solenoid head, which can reduce the risk of overheating and is more suitable for continuous or high-frequency operation.

[0047] Example 2: Reference Figure 4 The difference from Embodiment 1 is that a sealing ring 28 is also provided between the outer wall of the sealing valve core 20 and the inner wall of the upper valve seat 6 to seal the gap between the guide band 19 and the upper valve seat 6, so that the gas pressure in the pressure chamber enters only through the main air inlet 22-first pilot air inlet 24-connecting hole 27-pilot chamber-second pilot air inlet 25.

[0048] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A pilot operated valve for high pressure and large flow gas on-off control, characterized by, include: The lower valve seat (1) and the upper valve seat (6) are fixedly connected to each other, and a pressure chamber is formed between them; The sealing valve core component is slidably disposed in the pressure chamber, and a sealing spring (18) is provided between it and the upper valve seat (6); The sleeve assembly (9) is installed on the upper valve seat (6) and forms a pilot cavity between the sleeve assembly (9) and the upper valve seat (6); The moving iron core component is slidably disposed in the pilot cavity, and a pilot sealing spring (14) is provided between it and the bushing assembly (9); The electromagnetic head (10) is fitted onto the outer wall of the sleeve assembly (9) and is used to generate electromagnetic force to attract the moving iron core component. The lower valve seat (1) is provided with a main air inlet (22) and a main air outlet (23), both of which are connected to the pressure chamber; the sealing valve core component is sealed at the connection between the main air outlet (23) and the main air inlet (22) and the pressure chamber under the elastic force of the sealing spring (18); The upper valve seat (6) is provided with: a first pilot air inlet hole (24) connecting the main air inlet (22) and the pilot cavity, a second pilot air inlet hole (25) connecting the pilot cavity and the pressure cavity, and a pilot air outlet hole (26) connecting the pilot cavity and the main air outlet (23); the moving iron core component is sealed at the connection port between the pilot air outlet hole (26) and the pilot cavity under the elastic force of the pilot sealing spring (14).

2. The pilot operated on / off control valve for high pressure and large flow rate gas according to claim 1, wherein The upper valve seat (6) is also provided with a connecting hole (27). One end of the first pilot air inlet (24) is connected to the main air inlet (22), and the other end is connected to the pilot cavity through the connecting hole (27). The diameter of the connecting hole (27) is smaller than the diameter of the first pilot air inlet (24).

3. The pilot operated on / off control valve for high pressure and large flow rate gas according to claim 1, wherein The entire port of the main air outlet (23) is connected to the pressure chamber, and a portion of the port area of ​​the main air inlet (22) is connected to the pressure chamber.

4. The pilot operated on / off control valve for high pressure and large flow rate gas according to claim 3, wherein The sealing valve core component includes a sealing valve core (20) and a sealing plate (21) embedded in the groove on the end face of the sealing valve core (20). The sealing plate (21) is used to block the entire port of the main air outlet (23) and the part of the port of the main air inlet (22) that communicates with the pressure chamber.

5. The pilot operated on / off control valve for high pressure and large flow rate gas according to claim 4, wherein The sealing plate (21) is made of rubber.

6. The pilot operated on / off control valve for high pressure and large flow rate gas according to claim 4 or 5, wherein A guide band (19) is provided between the outer wall of the sealing valve core (20) and the inner wall of the upper valve seat (6). The guide band (19) is embedded in the groove of the side wall of the sealing valve core (20) to guide the sliding of the sealing valve core (20) in the pressure chamber.

7. The pilot operated on / off control valve for high pressure and large flow rate gas according to claim 1, wherein The moving iron core component includes a moving iron core (13) and a pilot plug (15) embedded in the groove on the end face of the moving iron core (13).

8. The pilot operated on / off control valve for high pressure and large flow rate gas according to claim 1, wherein The lower valve seat (1) has a first O-ring (2) for sealing the connection surface of the main air outlet (23) and a second O-ring (3) for sealing the connection surface of the main air inlet (22) respectively embedded in the end face groove.

9. The pilot operated on / off control valve for high pressure and large flow rate gas according to claim 1 or 8, wherein The lower valve seat (1) and the upper valve seat (6) are fixedly connected by several sets of washers (17) and screws (16), and a third O-ring (4) is provided on the connection surface between the two for sealing.

10. The pilot operated on / off control valve for high pressure and large flow rate gas according to claim 1, wherein The connection surface between the sleeve assembly (9) and the upper valve seat (6) is provided with a fourth O-ring (8) for sealing. The fourth O-ring (8) is embedded in the side wall groove of the sleeve assembly (9).

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