An explosion-proof valve

Abstract

The application relates to the technical field of electromagnetic valves, in particular to a flameproof valve which comprises a valve body and a pilot seat, the valve body is internally provided with a valve cavity, the valve cavity is internally provided with a valve rod, the pilot seat is internally provided with a pressure chamber, the pressure chamber is internally provided with an annular partition plate, the annular partition plate divides the pressure chamber into an inner piston cavity and an outer pressure relief cavity, a piston sleeve is slidably arranged in the inner piston cavity; the pilot seat is also internally provided with an annular chamber, the annular chamber is internally provided with a pressure relief structure, the pressure relief structure comprises an annular sealing piece and a compression spring connected with the annular sealing piece, the annular sealing piece and the annular partition plate are separated at an end face to form an annular pressure relief port, and the inner side of the annular sealing piece is provided with a guide face. The guide face of the annular sealing piece converts high-pressure gas into axial thrust, separates the annular sealing piece from the end face of the annular partition plate, forms the annular pressure relief port, realizes automatic pressure relief, and improves the safety of the flameproof valve under sudden high pressure.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic valve technology, specifically to an explosion-proof valve. Background Technology

[0002] Existing explosion-proof valves use a pilot control method. Their working principle is as follows: the pilot channel is controlled by a miniature solenoid valve, thereby controlling the pressure change in the piston chamber, pushing the piston to move the valve stem, and realizing the opening and closing action of the valve body.

[0003] However, once the piston is pushed into position and completes the reversal, the piston chamber is in a pressure-holding state. If abnormally high pressure continues to enter the piston chamber at this time, because the piston chamber is connected to the pilot channel, and the pilot channel is only controlled by a miniature solenoid valve or manual lever, lacking an automatic pressure relief function, the pressure in the piston chamber cannot be released in time. Under continuous high pressure, the valve stem and piston are further compressed, causing excessive pressure accumulation in the piston chamber, which affects the safety of the explosion-proof valve under extreme operating conditions.

[0004] Therefore, there is a need for an explosion-proof valve with an automatic pressure relief structure in the piston chamber. When abnormally high pressure occurs in the piston chamber under pressure holding conditions, the pressure can be automatically released to prevent excessive pressure accumulation in the piston chamber. This solves the problem that the functional components inside the explosion-proof valve are damaged by high pressure impact due to the lack of automatic pressure relief function in the existing technology, and improves the safety of the explosion-proof valve under extreme working conditions. Summary of the Invention

[0005] This invention addresses the problems existing in the prior art by providing an explosion-proof valve that converts high-pressure gas into axial thrust through the guiding surface of the annular seal, pushing the annular seal to separate from the end face of the annular partition, forming an annular pressure relief port, thereby achieving automatic pressure relief and improving the safety of the explosion-proof valve under sudden high pressure.

[0006] To address the problems of existing technologies, this invention provides an explosion-proof valve, comprising a valve body and a pilot seat sealed therewith. The valve body has a valve cavity, and a valve stem is disposed within the valve cavity. The valve body has an air inlet, a first working port, and a second working port communicating with the valve cavity. The pilot seat has a pressure chamber and a pilot channel communicating with it. An annular partition is disposed within the pressure chamber, dividing it into an inner piston chamber and an outer pressure relief chamber. A piston sleeve, connected to the end of the valve stem, is slidably disposed within the inner piston chamber. The pilot seat also has a valve seat communicating with the pressure chamber. The annular chamber contains a pressure relief structure, which includes an annular seal coaxially embedded in the annular chamber. When the annular seal and the annular partition are in contact at their end faces, they form an annular sealing surface; when the end faces are separated, they form an annular pressure relief port. A compression spring is coaxially disposed in the annular chamber. One end of the compression spring abuts against the bottom wall of the annular chamber, and the other end abuts against the end face of the annular seal. The inner diameter of the annular seal is equal to the inner diameter of the annular partition. The annular seal has a guide surface along the circumferential direction on its inner side facing the annular partition.

[0007] Preferably, the sealing end face of the annular seal is a plane, which is parallel and fits against the end face of the annular partition. The guiding surface is inclined from the inner edge of the sealing end face to the outer edge, forming a conical inclined surface that expands outward toward the annular partition.

[0008] Preferably, the annular seal is fitted with a ring sleeve on its outer side, the ring sleeve is located inside the external pressure relief cavity and is in close contact with its outer wall, and the inner wall of the ring sleeve is provided with a spiral groove along the axial direction to guide the pressure relief airflow along the spiral path.

[0009] Preferably, the annular partition has an annular interlayer extending inward from its self-sealing end face, and the annular partition has a plurality of arc-shaped openings evenly distributed along the circumferential direction. The arc-shaped openings connect to the annular interlayer from the inside to the outside, and each arc-shaped opening is provided with a one-way valve.

[0010] Preferably, the axis of the annular interlayer is perpendicular to the end face of the annular seal, which is used to guide the gas to flow along a path parallel to the moving direction of the annular seal.

[0011] Preferably, each of the arc-shaped openings is provided with a strain gauge at the position corresponding to the one-way valve, for monitoring the pressure on the one-way valve.

[0012] Preferably, the pilot seat is provided with an inlet and outlet air passage communicating with the annular chamber, and an air valve is provided at the inlet and outlet air passage. The air valve is electrically connected to the strain gauge and is used to control the opening and closing of the air valve according to the pressure signal monitored by the strain gauge.

[0013] Preferably, the annular partition has a vent port at the end facing the valve body that communicates with the external pressure relief chamber, and the valve body has a corresponding pressure relief channel that communicates with the vent port.

[0014] Preferably, the annular partition is composed of an inner sleeve and an outer sleeve, with an annular interlayer formed between them, and the arc-shaped opening is formed on the inner sleeve to connect the inner piston cavity and the annular interlayer.

[0015] Preferably, the annular seal is made of rubber, and a sealing gasket is provided on the pilot seat and on the inner side of the annular seal to abut against it.

[0016] The advantages of this application compared to the prior art are: 1. This invention forms a seal by parallel contact between an annular seal and the end face of an annular partition. A guide surface, inclined outwards from the inner edge of the sealing end face, is provided on the inner side of the annular seal, forming a tapered slope that expands outwards towards the annular partition. When abnormally high pressure occurs in the inner piston cavity, the high-pressure gas first acts on this guide surface. The axial force generated by the slope pushes the annular seal against the compression spring force, causing the annular seal to separate from the end face of the annular partition, forming an annular pressure relief port. Automatic pressure relief and reset are achieved through pressure changes, improving the safety of the explosion-proof valve under sudden high-pressure conditions.

[0017] 2. This invention utilizes an annular interlayer on an annular partition, through which high-pressure gas is introduced via a one-way valve through an arc-shaped opening on the partition. When abnormal high pressure is generated, the gas first pushes open the one-way valve and enters the annular interlayer, acting directly on the annular seal along its axial direction, applying a stable axial thrust that separates the seal from the partition, forming an initial annular pressure relief port. Subsequently, the high-pressure gas instantaneously enters the external pressure relief chamber through the annular pressure relief port, further pushing the annular seal outward under the impact of the airflow, thus expanding the annular pressure relief port and achieving rapid, high-flow-rate release, thereby improving the pressure relief response speed.

[0018] 3. This invention uses strain gauges to monitor the resistance changes caused by the deformation of the unidirectional valve under pressure in real time, converting the pressure signal into an electrical signal and feeding it back to the control system. Based on this signal, the air valve, under the operation of the control system, controls the air inlet and outlet. When a pressure signal is received, air is expelled from the annular chamber to release back pressure, causing the annular seal to be opened by high-pressure gas after losing back pressure support, thus expanding the annular pressure relief port for rapid pressure release. When no pressure signal is detected, the air valve introduces air into the annular chamber, establishing back pressure to press the annular seal tightly against the annular partition to maintain a seal. By monitoring the stress state of the unidirectional valve in real time and dynamically adjusting the back pressure, the opening and closing of the annular seal is precisely controllable. Attached Figure Description

[0019] Figure 1This is a three-dimensional structural schematic diagram of an explosion-proof valve according to the present invention from a first perspective.

[0020] Figure 2 This is a three-dimensional structural schematic diagram of an explosion-proof valve according to the present invention from a second perspective.

[0021] Figure 3 This is an exploded three-dimensional structural diagram of an explosion-proof valve according to the present invention.

[0022] Figure 4 This is a three-dimensional structural cross-sectional view of the valve body and pilot seat of an explosion-proof valve according to the present invention.

[0023] Figure 5 This is a planar sectional view of the valve body and pilot seat of an explosion-proof valve according to the present invention.

[0024] Figure 6 yes Figure 5 Enlarged diagram of point A.

[0025] Figure 7 yes Figure 5 Enlarged diagram of point B.

[0026] Figure 8 This is a three-dimensional exploded view of the pressure relief structure of an explosion-proof valve according to the present invention.

[0027] Figure 9 This is a three-dimensional structural cross-sectional view of the pilot seat and explosion-proof housing of an explosion-proof valve according to the present invention.

[0028] Figure 10 This is a three-dimensional structural diagram of the manual lever of an explosion-proof valve according to the present invention.

[0029] The following are the labels in the diagram: 1. Valve body; 11. Valve stem; 111. Piston sleeve; 112. Return spring; 12. Air inlet; 13. First working port; 14. Second working port; 15. First exhaust port; 16. Second exhaust port; 2. Pilot seat; 21. Pilot channel; 211. Pilot air passage; 22. Annular chamber; 23. Inlet and outlet air passages; 3. Explosion-proof housing; 31. Miniature solenoid valve; 32. Terminal block; 33. Manual lever; 331. Flow guide hole; 332. Operating part; 333. Slide... Moving end; 334, Limiting end; 34, Compression spring; 35, Limiting rod; 4, Annular partition; 41, Inner piston chamber; 42, Outer pressure relief chamber; 421, Vent port; 422, Pressure relief channel; 43, Annular interlayer; 431, Arc-shaped opening; 432, One-way valve; 433, Strain gauge; 44, Inner sleeve; 45, Outer sleeve; 5, Pressure relief structure; 51, Annular seal; 511, Ring sleeve; 5111, Spiral groove; 512, Sealing gasket; 52, Compression spring; 521, Guide surface. Detailed Implementation

[0030] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0031] See Figures 1 to 7 , Figure 9 and Figure 10 As shown, an explosion-proof valve includes a valve body 1 and a pilot seat 2 sealed to it. The valve body 1 has a valve cavity, and a valve stem 11 is provided in the valve cavity. The valve body 1 has an air inlet 12, a first working port 13, and a second working port 14 communicating with the valve cavity. The pilot seat 2 has a pressure chamber and a pilot channel 21 communicating with it. The pressure chamber has an annular partition 4, which divides the pressure chamber into an inner piston chamber 41 and an outer pressure relief chamber 42. A piston sleeve 111 connected to the end of the valve stem 11 is slidably provided in the inner piston chamber 41. The pilot seat 2 also has an annular chamber 22 communicating with the pressure chamber. The annular chamber 22 has a pressure relief structure 5, which includes an annular seal 51 coaxially embedded in the annular chamber 22. When the annular seal 51 and the annular partition 4 are in contact at their end faces, they form an annular sealing surface; when the end faces are separated, they form an annular pressure relief port. A compression spring 52 is coaxially disposed within the annular chamber 22. One end of the compression spring 52 abuts against the bottom wall of the annular chamber 22, and the other end abuts against the end face of the annular seal 51. The inner diameter of the annular seal 51 is equal to the inner diameter of the annular partition 4, and a guide surface 521 is provided circumferentially on the inner side of the annular seal 51 facing the annular partition 4.

[0032] The guide surface 521 is formed at the end of the annular seal 51.

[0033] The valve body 1 is also provided with a first exhaust port 15 and a second exhaust port 16 corresponding to the first working port 13 and the second working port 14, respectively.

[0034] A return spring 112 is provided on the side of the valve body 1 away from the pilot seat 2, and the two ends of the return spring 112 abut against the valve body 1 and the valve stem 11 respectively.

[0035] The pilot seat 2 is sealed with an explosion-proof shell 3. The explosion-proof shell 3 is equipped with a miniature solenoid valve 31 and a terminal block 32 electrically connected to the miniature solenoid valve 31. The terminal block 32 is led out through the lead hole on the explosion-proof shell 3. The miniature solenoid valve 31 is equipped with a pilot gas passage 211 that connects to the pilot channel 21. When the miniature solenoid valve 31 is opened, the gas in the pilot channel 21 flows directly into the inner piston chamber 41.

[0036] The pilot channel 21 is equipped with a manual lever 33 and a pressure spring 34 connected to the manual lever 33. The inner end of the manual lever 33 has a guide hole 331 communicating with the pilot channel 21, and the outer end has an operating part 332. The manual lever 33 is also equipped with a sliding groove, which includes a sliding end 333 and a limiting end 334. The sliding end 333 is arranged parallel to the extension direction of the manual lever 33, and the limiting end 334 is arranged perpendicular to the sliding end 333 and is located close to the operating part 332. The pilot seat 2 is equipped with a limiting rod 35 that slides in cooperation with the sliding groove. The pressure spring 34 always tends to move the manual lever 33 outward and makes the side wall of the sliding end 333 abut against the limiting rod 35.

[0037] During normal electric operation: When the miniature solenoid valve 31 is energized, it opens, and its internal pilot air passage 211 opens. The high-pressure gas in the pilot passage 21 directly enters the inner piston chamber 41, pushing the piston sleeve 111 and causing the valve stem 11 to move, thus opening the main valve. After power is cut off, the miniature solenoid valve 31 closes, and the valve stem 11 returns to its original position.

[0038] In manual emergency operation: The operator presses the outer operating part 332 of the manual lever 33 to overcome the resistance of the pressure spring 34, causing the manual lever 33 to move inward along the sliding end 333 of the slide groove. When the guide hole 331 at the inner end of the manual lever 33 aligns with the inlet of the inner piston chamber 41, the gas in the pilot channel 21 flows directly into the inner piston chamber 41 through the guide hole 331 without passing through the micro solenoid valve 31, thus pushing the piston sleeve 111 and valve stem 11 to move, achieving manual opening. After releasing the manual lever 33, the pressure spring 34 pushes the manual lever 33 to move outward, the side wall of the sliding end 333 of the slide groove abuts against the limit rod 35, the guide hole 331 is misaligned with the inlet of the inner piston chamber 41, the manual bypass is closed, and the normal state controlled only by the micro solenoid valve 31 is restored.

[0039] Abnormal high pressure state: During normal electric operation, the miniature solenoid valve 31 is energized and opens, allowing high-pressure gas in the pilot channel 21 to enter the inner piston chamber 41. This pushes the piston sleeve 111, causing the valve stem 11 to move and thus reversing the first working port 13 and the second working port 14 from the air inlet 12. At this time, if the pressure in the inner piston chamber 41 continues to rise due to a system malfunction, exceeding the working pressure required for normal reversal, the pressure in the pressure chamber will act on the annular seal 51.

[0040] Since the annular seal 51 is coaxially embedded in the annular chamber 22, with one end abutting against the bottom wall of the annular chamber 22 via a compression spring 52, and the other end fitting against the end face of the annular partition 4 to form an annular sealing surface, when the pressure inside the inner piston chamber 41 rises abnormally, the annular seal 51 overcomes the elastic force of the compression spring 52 under the thrust of the high-pressure gas, and its end face separates from the end face of the annular partition 4, thus forming an annular pressure relief port between them. At this time, the high-pressure gas in the inner piston chamber 41 no longer acts only on the piston sleeve 111, but flows rapidly into the outer pressure relief chamber 42 through this annular pressure relief port, achieving rapid pressure relief and preventing the valve stem 11 and piston sleeve 111 from jamming or being damaged due to overload.

[0041] Meanwhile, the guide surface 521 provided on the inner side of the annular seal 51 facing the annular partition 4 along the circumferential direction can guide the high-pressure gas to enter the annular pressure relief port more smoothly, reduce flow resistance, and improve the pressure relief response speed.

[0042] When the abnormal high pressure disappears, the elastic force of the compression spring 52 pushes the annular seal 51 back to its original position, causing the annular sealing surfaces to re-fit and restoring the sealed isolation between the inner piston chamber 41 and the outer pressure relief chamber 42. The purely mechanical pressure relief branch formed by the guide surface 521 and the compression spring 52 relies entirely on pressure changes within the pressure chamber for its opening and resetting, achieving automatic pressure relief without the need for additional sensors or control circuits. In embodiments with strain gauges 433 and air valves, the back pressure can be dynamically adjusted electronically to further optimize pressure relief control.

[0043] See Figure 6 and Figure 7 As shown, the sealing end face of the annular seal 51 is a plane, which is parallel and fits against the end face of the annular partition 4. The guide surface 521 is inclined from the inner edge of the sealing end face to the outer side, forming a conical inclined surface that expands outward toward the annular partition 4.

[0044] When a high-pressure anomaly occurs in the inner piston chamber 41, the annular seal 51 is in its initial state: its sealing end face is flat and parallel to the end face of the annular partition 4, forming a tight annular sealing surface. At this time, high-pressure gas cannot directly enter the gap between the sealing surfaces because the two planes are tightly fitted, and the gas lacks an initial entry channel.

[0045] However, the annular seal 51 has a guide surface 521 on its inner side facing the annular partition 4, which slopes outward from the inner edge of the sealing end face. This guide surface 521 forms a conical inclined surface that expands outward toward the annular partition 4. Under the action of high-pressure gas, this conical inclined surface provides a wedge-shaped space for the gas. The gas first acts on the guide surface 521. Because the inclined surface expands outward, the gas pressure generates a component force perpendicular to the inclined surface. This component force has an axial component, which can push the annular seal 51 to move away from the annular partition 4, thereby forcing the sealing end face to separate from the end face of the annular partition 4.

[0046] See Figures 6 to 8 As shown, the annular seal 51 is fitted with a ring sleeve 511 on its outer side. The ring sleeve 511 is located inside the external pressure relief chamber 42 and is in close contact with its outer wall. The inner wall of the ring sleeve 511 is provided with a spiral groove 5111 along the axial direction to guide the pressure relief airflow along the spiral path.

[0047] When high-pressure gas enters the external pressure relief chamber 42 through the annular pressure relief port formed between the annular seal 51 and the annular partition 4, the gas enters the interior of the ring sleeve 511. Because the inner wall of the ring sleeve 511 has an axially oriented spiral groove 5111, this groove guides the gas flow direction as it passes through the inner wall. The gas no longer flows in a straight axial direction but is forced to flow forward in a spiral shape along the path of the spiral groove 5111, forming a rotating spiral airflow within the ring sleeve 511. This spiral path guidance effectively mitigates the direct impact of the airflow, allowing the pressure relief airflow to exit in a more gentle manner, avoiding the violent impact and noise caused by direct gas flow.

[0048] See Figure 7 and Figure 8 As shown, the annular partition 4 has an annular interlayer 43 extending inward from the self-sealing end face inside. The annular partition 4 has a plurality of arc-shaped openings 431 evenly distributed along the circumferential direction. The arc-shaped openings 431 connect to the annular interlayer 43 from the inside to the outside. Each arc-shaped opening 431 is provided with a one-way valve 432.

[0049] When abnormally high pressure is generated in the inner piston chamber 41, the high-pressure gas pushes open the one-way valve 432 through the arc-shaped opening 431 on the annular partition 4 and enters the annular interlayer 43 extending inward from the sealing end face inside the annular partition 4. The gas flows along the annular interlayer 43 and acts directly on the annular seal 51, applying axial thrust to it, causing the annular seal 51 to separate from the annular partition 4, forming an initial annular pressure relief port. At this time, the high-pressure gas instantly enters the outer pressure relief chamber 42 through the annular pressure relief port. Under the impact of the airflow, the annular seal 51 is further pushed outward, and the annular pressure relief port expands accordingly, thereby realizing the rapid and large-flow release of high-pressure gas.

[0050] See Figure 6 and Figure 7 As shown, the axis of the annular interlayer 43 is perpendicular to the end face of the annular seal 51, and is used to guide the gas to flow along a path parallel to the moving direction of the annular seal 51.

[0051] The axis of the annular interlayer 43 is set perpendicular to the end face of the annular seal 51. This means that after the gas enters the annular interlayer 43, its flow direction is forcibly guided to move along the axis of the annular interlayer 43. Since this axis is perpendicular to the end face of the annular seal 51, the gas flow path remains parallel to the moving direction of the annular seal 51, thereby ensuring that the gas force is applied directly along the moving direction of the annular seal 51, so that the annular seal 51 can be smoothly pushed along its axial direction, avoiding uneven force or response delay caused by airflow deviation.

[0052] See Figure 7 and Figure 8 As shown, each of the arc-shaped openings 431 is provided with a strain gauge 433 at a position corresponding to the one-way valve 432, for monitoring the pressure on the one-way valve 432.

[0053] When gas impacts the one-way valve 432 through the arc-shaped opening 431, the one-way valve 432 deforms under pressure. This deformation is transmitted to the strain gauge 433 through the contact surface, causing a change in the resistance value inside the strain gauge 433. By measuring the change in resistance, the pressure value that the one-way valve 432 is subjected to at the current moment can be calculated and monitored in real time, thereby providing a pressure feedback signal to the system.

[0054] See Figure 6 As shown, the pilot seat 2 is provided with an inlet / outlet air passage 23 that communicates with the annular chamber 22. An air valve is provided at the inlet / outlet air passage 23. The air valve is electrically connected to the strain gauge 433 and is used to control the opening and closing of the air valve according to the pressure signal monitored by the strain gauge 433.

[0055] When the strain gauge 433 detects the pressure on the one-way valve 432, that is, when it senses the pressure signal, the air valve controls the inlet and outlet air passage 23 to exhaust air from the annular chamber 22 to the outside according to the signal, releasing the back pressure in the annular chamber 22, so that the annular seal 51 loses the back pressure support, and can be pushed open by high pressure gas from the annular partition 4, expanding the annular pressure relief port to achieve pressure relief.

[0056] When the strain gauge 433 does not detect a pressure signal, the air valve controls the air inlet and outlet passage 23 to allow air to enter the annular chamber 22, forming back pressure that acts on the annular seal 51, pressing it against the annular partition 4 to maintain a seal.

[0057] See Figure 7As shown, the end of the annular partition 4 facing the valve body 1 is provided with a vent 421 that communicates with the external pressure relief chamber 42, and the valve body 1 is provided with a corresponding pressure relief channel 422 that communicates with the vent 421.

[0058] When the annular seal 51 is pushed open, the gas in the inner piston chamber 41 enters the outer pressure relief chamber 42, and then is discharged outward through the connection between the vent 421 at the end of the annular partition 4 and the pressure relief channel 422, thereby realizing the release of gas.

[0059] See Figures 6 to 8 As shown, the annular partition 4 is composed of an inner sleeve 44 and an outer sleeve 45, with an annular interlayer 43 formed between them. The arc-shaped opening 431 is opened on the inner sleeve 44 to connect the inner piston cavity 41 and the annular interlayer 43.

[0060] When the pressure inside the inner piston cavity 41 is abnormally high, the gas inside the inner piston cavity 41 flows into the annular interlayer 43 formed by the inner sleeve 44 and the outer sleeve 45 through the arc-shaped opening 431 on the inner sleeve 44, thereby completing the directional transport of gas from the inner piston cavity 41 to the annular interlayer 43.

[0061] See Figure 6 As shown, the annular seal 51 is made of rubber, and a sealing gasket 512 is provided on the pilot seat 2 and located on the inner side of the annular seal 51 to abut against it.

[0062] Since the annular seal 51 is made of rubber, its elastic deformation capability allows it to fit tightly against the end face of the annular partition 4. Furthermore, since the sealing gasket 512 on the pilot seat 2 abuts against the annular seal 51, a tight contact pressure is formed between the two, thereby blocking the gas passage and ensuring that the valve stem 11 can operate normally without being disturbed by leaking gas.

[0063] This invention converts high-pressure gas pressure into an axial force through the guide surface 521 on the inner side of the annular seal 51, pushing the annular seal 51 to overcome the compression spring 52 and automatically forming the initial annular pressure relief port. Under high pressure, the high-pressure gas acts on the one-way valve 432, causing it to open. The high-pressure gas smoothly pushes the annular seal 51 axially along the annular interlayer 43, assisting in opening the annular pressure relief port. As a large amount of high-pressure gas flows into the outer pressure relief chamber 42, the annular seal 51 is further pushed, and the annular pressure relief port is enlarged, achieving rapid and high-flow-rate pressure relief.

[0064] Meanwhile, the deformation of the one-way valve 432 is monitored in real time by strain gauge 433 and the electrical signal is fed back to the external control system. Under the action of the air valve, the back pressure of the annular chamber 22 is dynamically adjusted to achieve precise and intelligent control of the opening and closing of the annular seal 51, thereby improving the safety of the explosion-proof valve under sudden high-pressure conditions.

[0065] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. An explosion-proof valve, comprising a valve body and a pilot seat sealed thereto, wherein the valve body is provided with a valve cavity, the valve cavity is provided with a valve stem, and the valve body is provided with an air inlet, a first working port and a second working port communicating with the valve cavity; Its features are, The pilot seat is provided with a pressure chamber and a pilot channel communicating with it. The pressure chamber is provided with an annular partition, which divides the pressure chamber into an inner piston chamber and an outer pressure relief chamber. A piston sleeve connected to the end of the valve stem is slidably provided in the inner piston chamber. The pilot seat also includes an annular chamber communicating with the pressure chamber, and the annular chamber is equipped with a pressure relief structure, which includes: An annular seal is coaxially embedded in an annular cavity. When the annular seal and the annular partition are in contact at their end faces, they form an annular sealing surface. When the end faces are separated, they form an annular pressure relief port. A compression spring is coaxially disposed in the annular cavity, with one end of the compression spring abutting against the bottom wall of the annular cavity and the other end abutting against the end face of the annular seal. The inner diameter of the annular seal is equal to the inner diameter of the annular partition, and the annular seal has a guide surface along the circumferential direction on the inner side of one end facing the annular partition.

2. The explosion-proof valve according to claim 1, characterized in that, The sealing end face of the annular seal is a plane, which is parallel and fits against the end face of the annular partition. The guiding surface is inclined from the inner edge of the sealing end face to the outer side, forming a conical inclined surface that expands outward toward the annular partition.

3. The explosion-proof valve according to claim 2, characterized in that, The annular seal is fitted with a ring sleeve on its outer side. The ring sleeve is located inside the external pressure relief chamber and is in close contact with its outer wall. The inner wall of the ring sleeve is provided with a spiral groove along the axial direction to guide the pressure relief airflow along the spiral path.

4. The explosion-proof valve according to claim 2, characterized in that, The annular partition has an annular interlayer extending inward from its self-sealing end face. Multiple arc-shaped openings are evenly distributed along the circumference of the annular partition. The arc-shaped openings connect to the annular interlayer from the inside out. Each arc-shaped opening is provided with a one-way valve.

5. The explosion-proof valve according to claim 4, characterized in that, The axis of the annular interlayer is perpendicular to the end face of the annular seal, and is used to guide the gas to flow along a path parallel to the moving direction of the annular seal.

6. The explosion-proof valve according to claim 4, characterized in that, Each of the arc-shaped openings is equipped with a strain gauge at a position corresponding to the one-way valve, for monitoring the pressure on the one-way valve.

7. The explosion-proof valve according to claim 6, characterized in that, The pilot seat is provided with an inlet and outlet air passage communicating with the annular chamber. An air valve is provided at the inlet and outlet air passage. The air valve is electrically connected to the strain gauge and is used to control the opening and closing of the air valve according to the pressure signal monitored by the strain gauge.

8. The explosion-proof valve according to claim 1, characterized in that, The annular baffle has a vent port at the end facing the valve body that communicates with the external pressure relief chamber, and the valve body has a corresponding pressure relief channel that communicates with the vent port.

9. The explosion-proof valve according to claim 4, characterized in that, The annular partition consists of an inner sleeve and an outer sleeve, with an annular interlayer formed between them. The arc-shaped opening is formed on the inner sleeve to connect the inner piston cavity and the annular interlayer.

10. The explosion-proof valve according to claim 1, characterized in that, The annular seal is made of rubber, and a sealing gasket is provided on the pilot seat and on the inner side of the annular seal to abut against it.

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