High-pressure pilot-operated type pneumatic valve

Abstract

The utility model provides a high-pressure pilot-operated type pneumatic valve, and belongs to the technical field of valves. A high-pressure pilot-operated type pneumatic valve comprises a valve body, the valve body is provided with a circulation channel, a mounting hole and a valve seat, the valve seat divides the circulation channel into a first cavity and a second cavity, and the valve seat is provided with a main channel communicated with the first cavity and the second cavity; the air cylinder is mounted at the mounting hole of the valve body and provided with a connecting part, the connecting part is mounted in the mounting hole and provided with a slide way, the air cylinder is provided with a piston rod, the end of the piston rod is provided with a sealing part, and the piston rod can extend into the slide way; the valve element is partially installed in the sliding way and can slide along the sliding way, the valve element is provided with a pressure relief hole and a pilot hole, a back pressure cavity is formed between the valve element and the bottom of the sliding way, the pilot hole is communicated with the first cavity and the back pressure cavity, the pressure relief hole is communicated with the back pressure cavity and the circulation channel, and the diameter of the pressure relief hole is larger than that of the pilot hole.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, in particular to a high-pressure pilot pneumatic valve. Background Art

[0002] As shown in patent CN202320512747.X, a pneumatic valve and water supply equipment for sanitation vehicles, during the sealing process, sealing is achieved only by the pressure of the cylinder, which results in a relatively large main valve core pressure. As a result, the piston of the traditional valve pneumatic actuator requires a large force to directly pull the main valve core, and the cylinder diameter of the actuator is also large, resulting in a larger pneumatic valve body to be installed. Summary of the invention

[0003] The utility model aims to solve the above problems in the prior art and proposes a high-pressure pilot pneumatic valve, which utilizes the pressure difference of the medium to drive, thereby making the cylinder diameter of the actuator smaller and further reducing the volume of the overall high-pressure pneumatic valve.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A high-pressure pilot pneumatic valve, comprising:

[0006] A valve body, the valve body having a flow passage, a mounting hole and a valve seat, the valve seat dividing the flow passage into a first cavity and a second cavity, and the valve seat opening a main passage connecting the first cavity and the second cavity;

[0007] A cylinder, the cylinder is mounted at the mounting hole of the valve body, the cylinder has a connecting portion, the connecting portion is mounted in the mounting hole, the connecting portion has a slideway, the cylinder has a piston rod, and the end of the piston rod has a sealing portion, and the piston rod can extend into the slideway;

[0008] A valve core, wherein the valve core part is installed in the slideway and can slide along the slideway, the valve core has a pressure relief hole and a pilot hole, a back pressure cavity is formed between the valve core and the bottom of the slideway, the pilot hole is connected with the first cavity and the back pressure cavity, the pressure relief hole is connected with the back pressure cavity and the flow channel, and the diameter of the pressure relief hole is larger than the diameter of the pilot hole;

[0009] Wherein, in the closed state, the sealing portion can be sealed at the pressure relief hole of the valve core, one end of the bottom sealing portion of the valve core can be against the valve seat to isolate the first cavity and the second cavity, and the pilot hole is connected with the first cavity and the back pressure cavity;

[0010] In the open state, the sealing portion is separated from the pressure relief hole of the valve core or / and the valve core is separated from the valve seat, so that the first cavity and the second cavity are communicated.

[0011] In the above-mentioned high-pressure pilot pneumatic valve, the cylinder includes a cylinder body, an end cover, a piston, a piston rod, and a spring. The piston, the piston rod, and the sealing part are an integrated structure. The cylinder body has an air cavity and a sliding hole connected to the air cavity; the piston slides in the air cavity, the piston rod passes through the sliding hole, and the sealing part is aligned with the pressure relief hole; the end cover is installed on the cylinder body and closes the air cavity; the spring is arranged between the end cover and the piston; wherein the spring keeps the pneumatic valve in a closed state.

[0012] In the above-mentioned high-pressure pilot pneumatic valve, the end cover and / or the piston are both provided with a limiting groove for limiting the spring.

[0013] In the above-mentioned high-pressure pilot-operated pneumatic valve, the cylinder body is threadedly connected to the valve body via a connecting portion.

[0014] In the above-mentioned high-pressure pilot-operated pneumatic valve, the cylinder body has an air inlet and an air outlet, and the piston is located between the air inlet and the air outlet.

[0015] In the above-mentioned high-pressure pilot-operated pneumatic valve, at least one first sealing ring is installed on the piston, and the first sealing ring abuts against and seals against the inner wall of the air cavity.

[0016] In the above-mentioned high-pressure pilot-operated pneumatic valve, at least one second sealing ring is installed on the inner wall of the sliding hole, and the second sealing ring abuts against the piston rod.

[0017] In the above-mentioned high-pressure pilot pneumatic valve, the pilot hole includes a first hole and a second hole, the first hole and the second hole are perpendicular to each other and connected, the first hole is connected to the back pressure cavity, and the second hole is connected to the first cavity.

[0018] In the above-mentioned high-pressure pilot pneumatic valve, the valve core has a recessed groove at one end facing the cylinder, one end of the pilot hole is connected to the recessed groove, and the other end is connected to the first chamber.

[0019] Compared with the prior art, this application has the following advantages:

[0020] Using the medium's own pressure to achieve sealing and opening reduces dependence on high-pressure cylinders and reduces energy consumption. In long-term industrial systems, it can significantly reduce energy costs, and smaller cylinders can be used, reducing hardware costs. For large-scale production and applications, it can save a lot of procurement costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional structural diagram of a closed state in this application;

[0022] Figure 2 It is a cross-sectional structural diagram of an open state in this application;

[0023] Figure 3 It is a schematic diagram of an explosion structure in this application;

[0024] Figure 4 It is a three-dimensional structural diagram in this application;

[0025] Figure 5 It is a three-dimensional structural diagram of a valve core and a piston in this application.

[0026] In the figure,

[0027] 2. Valve body; 21. Circulation channel; 211. First cavity; 212. Second cavity; 22. Mounting hole; 23. Valve seat; 231. Main channel; 24. Inlet; 25. Outlet;

[0028] 3. Cylinder; 31. Cylinder body; 311. Connecting part; 3111. Slideway; 312. Air cavity; 313. Slide hole; 3131. Second sealing ring; 314. Air inlet; 315. Exhaust port; 32. Piston rod; 33. Sealing part; 34. End cover; 35. Piston; 351. First sealing ring; 36. Spring;

[0029] 4. valve core; 41. pressure relief hole; 42. pilot hole; 421. first hole; 422. second hole; 43. recessed groove; 44. bottom sealing part;

[0030] 5. Back pressure chamber;

[0031] 6. Limiting groove. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figures 1 to 5As shown, a high-pressure pilot pneumatic valve comprises: a valve body 2, a cylinder 3 and a valve core 4, the valve body 2 has a flow channel 21, a mounting hole 22 and a valve seat 23, the valve seat 23 divides the flow channel 21 into a first chamber 211 and a second chamber 212, and the valve seat 23 is provided with a main channel 231 connecting the first chamber 211 and the second chamber 212; the cylinder 3 is installed at the mounting hole 22 of the valve body 2, the cylinder 3 has a connecting portion 311, the connecting portion 311 is installed in the mounting hole 22, the connecting portion 311 has a slideway 3111, the cylinder 3 has a piston rod 32 and the end of the piston rod 32 has a sealing portion 33, the piston rod 32 can extend into the slideway 3111; the valve core 4 is partially installed in the slideway 3111 and can move along the slideway 3111. Sliding along the slide 3111, the valve core 4 has a pressure relief hole 41 and a pilot hole 42, a back pressure chamber 5 is formed between the valve core 4 and the bottom of the slide 3111, the pilot hole 42 is connected with the first chamber 211 and the back pressure chamber 5, and the pressure relief hole 41 is connected with the back pressure chamber 5 and the circulation channel 21; wherein, in the closed state, the sealing portion 33 can be blocked at the pressure relief hole 41 of the valve core 4, and one end of the bottom sealing portion 44 of the valve core 4 can abut against the valve seat 23 to isolate the first chamber 211 and the second chamber 212, and the pilot hole 42 is connected with the first chamber 211 and the back pressure chamber 5; in the open state, the sealing portion 33 is separated from the pressure relief hole 41 of the valve core 4 or / and the valve core 4 is separated from the valve seat 23, so that the first chamber 211 and the second chamber 212 are connected.

[0034] In the present application, in the closed state, one end of the bottom sealing portion 44 of the valve core 4 abuts against the valve seat 23, and the sealing portion 33 at the lower end of the piston rod 32 blocks the pressure relief hole 41 of the valve core 4, thereby isolating the first chamber 211 and the second chamber 212. At this time, the medium flowing into the first chamber 211 of the valve body 2 flows into the back pressure chamber 5 through the pilot hole 42, so that the pressure in the back pressure chamber 5 is consistent with that in the first chamber 211, and the valve core 4 is pressed against the valve seat 23 by using this pressure. At this time, the pressure on the valve core 4 mainly comes from the pressure of the medium itself, and the sealing portion 33 at the end of the piston rod 32 only needs to seal the pressure relief hole 41, and there is no need to use a high-pressure cylinder 3 as an actuator, so a smaller cylinder 3 can be used.

[0035] When the valve needs to be opened, the cylinder 3 is activated, the piston rod 32 moves away from the valve core 4, the sealing part 33 is separated from the pressure relief hole 41 of the valve core 4, and the pressure relief hole 41 is in a conducting state. Since the diameter of the pressure relief hole 41 is larger than the diameter of the pilot hole 42, the medium flows from the pressure relief hole 41 into the second chamber 212, and the pressure of the back pressure chamber 5 is reduced to a pressure close to the valve outlet 25, while the medium pressure at the bottom of the valve core 4 outside the main channel 231 is close to the high pressure of the inlet 24 of the valve body 2. Under the action of the upward high pressure of the medium, the valve core 4 rises upward, the main channel 231 opens, the first chamber 211 and the second chamber 212 are connected, the fluid circulation is realized, and the valve is in an open state.

[0036] Sealing and opening are achieved by using the medium's own pressure, which reduces dependence on high-pressure cylinders 3 and reduces energy consumption. In long-term industrial systems, energy costs can be significantly reduced, and smaller cylinders 3 can be used, which reduces hardware costs. For large-scale production and applications, a large amount of procurement costs can be saved.

[0037] Specifically, the cylinder 3 includes a cylinder body 31, an end cover 34, a piston 35, a piston rod 32, and a spring 36. The piston 35, the piston rod 32, and the sealing portion 33 are an integrated structure. The cylinder body 31 has an air cavity 312 and a sliding hole 313 connected to the air cavity 312; the piston 35 slides in the air cavity 312, the piston rod 32 passes through the sliding hole 313, and the sealing portion 33 is aligned with the pressure relief hole 41; the end cover 34 is installed on the cylinder body 31 and closes the air cavity 312; the spring 36 is arranged between the end cover 34 and the piston 35; wherein the spring 36 keeps the pneumatic valve in a closed state.

[0038] In the closed state, the spring 36 is in a compressed state, and its elastic force acts on the piston 35, so that the piston 35 drives the piston rod 32 and the sealing part 33 to remain in the position of blocking the pressure relief hole 41 of the valve core 4, thereby closing the valve. When the valve needs to be opened, gas is introduced into the air cavity 312, and the gas pressure overcomes the elastic force of the spring 36, pushing the piston 35 to slide in the air cavity 312, thereby driving the piston rod 32 to move, separating the sealing part 33 from the pressure relief hole 41 of the valve core 4, and opening the valve.

[0039] The presence of spring 36 enables the valve to automatically return to the closed state when external power is lost.

[0040] If there is a sudden power interruption, it can prevent the fluid from flowing uncontrollably. The piston 35, piston rod 32, and seal 33 are an integrated structure, which reduces the connection points between parts, reduces the risk of failure due to loose connection or poor fit, and improves the stability and reliability of the entire structure. There is no need to install the piston 35, piston rod 32, and seal 33 separately, which simplifies the assembly process, improves production efficiency, and reduces the possibility of assembly errors.

[0041] Specifically, a limiting groove 6 for limiting the spring 36 is provided on the end cover 34 and / or the piston 35 .

[0042] The limiting groove 6 can ensure that the spring 36 always remains in a predetermined position during the compression and extension process, avoiding the spring 36 from being offset or misplaced, thereby ensuring that the direction of the force of the spring 36 is accurate and improving the stability and reliability of the pneumatic valve.

[0043] Specifically, the cylinder body 31 is threadedly connected to the valve body 2 via the connecting portion 311 .

[0044] The threaded connection is relatively simple to operate, does not require complex tools and professional skills, is easy to install and disassemble, and improves assembly efficiency. For example, when repairing or replacing parts on site, installation can be completed quickly.

[0045] Specifically, the cylinder body 31 has an air inlet 314 and an air outlet 315, and the piston 35 is located between the air inlet 314 and the air outlet 315. Further, the air inlet 314 is arranged on a side closer to the valve body 2 than the air outlet 315.

[0046] Specifically, at least one first sealing ring 351 is installed on the piston 35 , and the first sealing ring 351 abuts against and seals against the inner wall of the air cavity 312 .

[0047] The gas leakage between the piston 35 and the inner wall of the air chamber 312 is effectively prevented, thereby improving the working efficiency and performance of the cylinder 3.

[0048] Specifically, at least one second sealing ring 3131 is installed on the inner wall of the sliding hole 313 , and the second sealing ring 3131 abuts against the piston rod 32 .

[0049] The medium is effectively prevented from leaking from the gap between the sliding hole 313 and the piston rod 32, thereby ensuring the pressure stability and working efficiency inside the cylinder 3.

[0050] Specifically, the pilot hole 42 includes a first hole 421 and a second hole 422 . The first hole 421 and the second hole 422 are perpendicular to each other and communicated with each other. The first hole 421 is communicated with the back pressure chamber 5 , and the second hole 422 is communicated with the first chamber 211 .

[0051] In the closed state, the medium can flow into the back pressure chamber 5 from the second hole 422, which can reduce the pressure on the valve core 4. After the medium successfully flows into the back pressure chamber 5, the pressure of the back pressure chamber 5 is consistent with the pressure at the inlet 24 of the valve body 2. At this time, the valve core 4 can be pressed tightly with the help of the pressure of the medium. Furthermore, the orifice of the second hole 422 faces the inlet 24 of the valve body 2.

[0052] Specifically, the end of the valve core 4 facing the cylinder 3 has a recessed groove 43 , one end of the pilot hole 42 is connected to the recessed groove 43 , and the other end is connected to the first chamber 211 .

[0053] The design of the recessed groove 43 can prevent the back pressure chamber 5 from disappearing after the upper end surface of the valve core 4 is completely in contact with the bottom of the slide 3111, and the medium cannot flow into the back pressure chamber 5 from the pilot hole 42, resulting in the valve core 4 and the valve seat 23 being unable to be sealed only by the elastic force of the spring 36.

[0054] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative position relationship and movement status of the components in a certain specific posture, as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0055] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. At the same time, the meaning of "and / or" appearing in the full text is that it includes three schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0056] The above components are all common standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0057] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A high-pressure pilot pneumatic valve, characterized in that: include: A valve body (2), the valve body (2) comprising a circulation channel (21), a mounting hole (22) and a valve seat (23), the valve seat (23) dividing the circulation channel (21) into a first chamber (211) and a second chamber (212), the valve seat (23) being provided with a main channel (231) connecting the first chamber (211) and the second chamber (212); A cylinder (3), the cylinder (3) being mounted at a mounting hole (22) of the valve body (2), the cylinder (3) having a connecting portion (311), the connecting portion (311) being mounted in the mounting hole (22), the connecting portion (311) having a slideway (3111), the cylinder (3) having a piston rod (32), and an end of the piston rod (32) having a sealing portion (33), and the piston rod (32) being capable of extending into the slideway (3111); A valve core (4), wherein the valve core (4) is partially installed in the slideway (3111) and can slide along the slideway (3111), the valve core (4) has a pressure relief hole (41) and a pilot hole (42), a back pressure chamber (5) is formed between the valve core (4) and the bottom of the slideway (3111), the pilot hole (42) is connected with the first chamber (211) and the back pressure chamber (5), the pressure relief hole (41) is connected with the back pressure chamber (5) and the circulation channel (21), and the diameter of the pressure relief hole (41) is larger than the diameter of the pilot hole (42); Wherein, in the closed state, the sealing portion (33) can block the pressure relief hole (41) of the valve core (4), and one end of the bottom sealing portion (44) of the valve core (4) can abut against the valve seat (23) to isolate the first chamber (211) and the second chamber (212), and the pilot hole (42) is connected with the first chamber (211) and the back pressure chamber (5); In the open state, the sealing portion (33) is separated from the pressure relief hole (41) of the valve core (4) and the valve core (4) is separated from the valve seat (23), so that the first chamber (211) and the second chamber (212) are in communication.

2. The high pressure pilot operated pneumatic valve according to claim 1, characterized in that: The cylinder (3) comprises a cylinder body (31), an end cover (34), a piston (35), a piston rod (32), and a spring (36); the piston (35), the piston rod (32), and a sealing portion (33) are an integrated structure; the cylinder body (31) has an air cavity (312) and a sliding hole (313) connected to the air cavity (312); the piston (35) slides in the air cavity (312), the piston rod (32) passes through the sliding hole (313), and the sealing portion (33) is aligned with the pressure relief hole (41); the end cover (34) is mounted on the cylinder body (31) and closes the air cavity (312); the spring (36) is arranged between the end cover (34) and the piston (35); wherein the spring (36) keeps the pneumatic valve in a closed state.

3. The high pressure pilot operated pneumatic valve according to claim 2, characterized in that: The end cover (34) and / or the piston (35) are both provided with a limiting groove (6) for limiting the spring (36).

4. The high-pressure pilot-operated pneumatic valve according to claim 2, characterized in that: The cylinder body (31) is threadedly connected to the valve body (2) via a connecting portion (311).

5. The high-pressure pilot-operated pneumatic valve according to claim 2, characterized in that: The cylinder body (31) has an air inlet (314) and an air outlet (315), and the piston (35) is located between the air inlet (314) and the air outlet (315).

6. The high pressure pilot operated pneumatic valve according to claim 5, characterized in that: At least one first sealing ring (351) is installed on the piston (35), and the first sealing ring (351) abuts against and seals against the inner wall of the air cavity (312).

7. The high pressure pilot operated pneumatic valve according to claim 5, characterized in that: At least one second sealing ring (3131) is installed on the inner wall of the sliding hole (313), and the second sealing ring (3131) abuts against the piston rod (32).

8. The high pressure pilot operated pneumatic valve according to claim 1, characterized in that: The pilot hole (42) comprises a first hole (421) and a second hole (422), the first hole (421) and the second hole (422) are perpendicular to each other and connected, the first hole (421) is connected to the back pressure chamber (5), and the second hole (422) is connected to the first chamber (211).

9. The high pressure pilot operated pneumatic valve according to claim 1, characterized in that: The valve core (4) has a recessed groove (43) at one end facing the cylinder (3); one end of the pilot hole (42) is connected to the recessed groove (43), and the other end is connected to the first chamber (211).

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