Mining safety valve

Abstract

The mining safety valve comprises a valve body, a valve cover, a valve seat, a valve rod, a valve clack and a driving spring, a front section sealing face is formed on the valve seat, a front section scraping part which is in sealing sliding fit with the front section sealing face is formed on the valve clack, and a sealing assembly is arranged on the front section sealing face. A blocking ring is arranged on the side, close to the movement path of the valve clack, of the sealing assembly on the valve seat in a sealing damping sliding mode, the blocking ring moves to have a sealing position and a non-sealing position which block and seal the outer side of the sealing assembly, and the blocking ring and the front-section scraping part form linkage. The sealing assembly has the sealing state that the sealing assembly extends out of the blocking ring and abuts against and seals the front section scraping part and the isolation state that the sealing assembly is contained in the valve seat. The sealing assembly and the valve clack form linkage through the linkage assembly so that switching between the sealing state and the isolation state can be achieved. The valve has the following advantages and effects that the valve has longer sealing effectiveness, so that the service life of the valve is prolonged, and the practical performance of the valve is improved.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a safety valve for mining. Background Technology

[0002] A safety valve is a special valve that is normally closed under external force. When the pressure of the medium in the equipment or pipeline rises above a preset value, it discharges the medium to the outside of the system to prevent the pressure of the medium in the pipeline or equipment from exceeding the specified value. In the mining industry, safety valves are key devices to ensure the safety of production equipment and personnel. Their core function is to control pressure through automatic opening and closing to prevent equipment damage or safety accidents caused by overpressure.

[0003] Safety valves can be broadly categorized into two sealing types: hard seals and soft seals. In practical applications of safety valves in the mining industry, it has been observed that some particulate matter in the mining medium adheres to the sealing surface of the safety valve as it passes through. If a hard seal is used, this can lead to minute gaps in the sealing surface during closure, causing valve leakage and posing a significant safety risk. If a soft seal is used, the particles adhering to the sealing surface become embedded in the elastic sealing surface during valve closure. As the amount of embedded particles increases, the sealing surface eventually fails.

[0004] Existing technologies also employ filters or spray structures to address this problem. However, filters are susceptible to damage from large amounts of particulate matter in the medium, requiring frequent replacement and significantly reducing their practicality. Furthermore, existing spray structures have a critical drawback: when the valve is closed, the spray structure cannot clean the sealing surface; when the valve is open, the medium continuously flows through the sealing surface, making it equally difficult to achieve the desired cleaning effect. Based on these issues, this invention was developed. Summary of the Invention

[0005] The purpose of this invention is to provide a mine safety valve that has a longer sealing effectiveness, thereby extending the valve's service life and improving its practical performance.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a mine safety valve, comprising a valve body, a valve cover installed on the valve body, a valve seat installed on the valve body, a valve stem slidably installed on the valve cover, a valve disc disposed at the end of the valve stem facing the valve seat, and a drive spring for driving the valve disc to seal the valve seat. The valve seat has a front sealing surface extending along the movement direction of the valve disc. The valve disc has a front scraping part forming a sealing sliding fit with the front sealing surface. The front sealing surface is provided with a retractable sealing assembly. A blocking ring is slidably disposed on the side of the valve seat near the movement path of the valve disc and provides sealing damping. The blocking ring has a sealing position and a non-sealing position that blocks the sealing outside the sealing assembly. The blocking ring and the front scraping part are linked to achieve switching between the sealing position and the non-sealing position. The sealing assembly has a sealing state that extends past the blocking ring and abuts against the front scraping part and is isolated state that is housed in the valve seat. The sealing assembly is linked with the valve disc through a linkage assembly to achieve switching between the sealing state and the isolated state.

[0007] By adopting the above technical solution, when the valve is in the open state, the retaining ring is in the sealed position, and the sealing components used for sealing prevent contact with particulate matter in the medium. During the sealing process, the valve disc drives the front scraping part to move towards the valve seat. Through the sealing sliding fit between the front scraping part and the front sealing surface, particulate matter adhering to the front sealing surface and the outer wall of the front scraping part is scraped off, forming a pre-seal between the two. The fit between the two primarily serves the scraping function, and secondarily the sealing function.

[0008] During the aforementioned movement, the front scraper section, in conjunction with the retaining ring, moves the retaining ring from a sealed position to a non-sealed position. At this time, both the upper and lower sides of the sealing assembly are sealed by the front scraper section and the front sealing surface, ensuring that even when the retaining ring is in the non-sealed position, the sealing assembly does not come into contact with particulate matter in the medium. The continuing movement of the valve disc, through the linked assembly, moves the sealing assembly from an isolated state to a sealed state, causing the sealing assembly to press tightly against the front scraper section. This extends the valve's sealing effectiveness, resulting in a longer service life and improved practical performance.

[0009] Further configuration: the blocking ring and the front scraping part are in a damped sliding fit, the sealing position of the blocking ring is located in the non-sealing position near the valve stem, and the blocking ring is provided with a friction pad layer on the side near the valve disc movement path.

[0010] By adopting the above technical solution, a damped sliding fit is established between the blocking ring and the front scraping section. This damped sliding blocking ring, combined with the downward movement of the front scraping section past the blocking ring, allows the blocking ring to switch from a sealed position to a non-sealed position. Conversely, the upward movement of the front scraping section allows the blocking ring to switch from a non-sealed position to a sealed position, thus achieving linkage between the two. The frictional resistance between the blocking ring and the front scraping section is greater than the frictional resistance of the blocking ring itself, and the damped sliding fit does not interfere with the normal movement of the front scraping section. Furthermore, a friction pad layer is added to further increase the frictional resistance between the blocking ring and the front scraping section, thereby achieving stable linkage between the two.

[0011] The sealing assembly is further configured such that: the sealing assembly includes a mounting groove disposed on the front sealing surface, an elastic seal disposed in the mounting groove, and a telescopic cavity formed in the elastic seal, wherein the elastic seal can extend or retract toward one side of the valve disc movement path.

[0012] By adopting the above technical solution, the telescopic cavity controls the elastic seal to extend and retract, thereby driving the elastic seal to move toward the side of the valve disc's movement path and press against the front scraping part to form a seal, or retracting into the valve seat, so that the sealing assembly can perform sealing without interfering with the normal movement of the blocking ring.

[0013] The linkage component is further configured as follows: the linkage assembly includes a pressure linkage structure disposed in the valve seat and connected to an elastic seal, a plurality of linkage holes opened in the valve seat and connecting the top of the valve seat to the pressure linkage structure, and a plurality of linkage columns that move with the valve disc and correspond one-to-one with the plurality of linkage holes. The linkage columns are slidably disposed on the valve disc and connected to a compression spring that drives the linkage columns to move downward.

[0014] By adopting the above technical solution, after the front scraping section controls the blocking ring to switch from the sealed position to the non-sealed position, the valve disc control linkage column is inserted into the linkage hole to squeeze the pressure linkage structure, thereby controlling the elastic seal to expand and contract to switch between the sealed state and the isolation state, thus achieving the linkage purpose. By setting the linkage column to a sliding manner to compensate for the movement stroke of the valve disc, structural interference is avoided.

[0015] The pressure linkage structure is further configured as follows: a pressure linkage sleeve disposed in the valve seat, a pressure linkage cavity formed in the pressure linkage sleeve, a plurality of linkage blocks that are slidably disposed in each linkage hole and located above the pressure linkage sleeve, and a reset spring installed in the pressure linkage cavity for resetting the linkage blocks. The pressure linkage sleeve extends into the linkage hole, and the pressure linkage cavity is connected to the telescopic cavity.

[0016] By adopting the above technical solution, when the return spring is not squeezed by the linkage pressure block, the sealing assembly is in an isolated state. When the linkage column squeezes the pressure linkage sleeve through the linkage pressure block, the gas in the pressure linkage sleeve is transported to the telescopic cavity to drive the elastic seal to extend towards the movement path of the valve disc and press against the front scraping part to form a seal. After the force of the linkage column is lost, the compressed pressure linkage cavity is reset under the action of the return spring, thereby extracting the gas in the telescopic cavity to allow the elastic seal to contract and switch to the isolated state.

[0017] The valve seat is further configured such that a groove is provided on the valve seat for the sealing and sliding of the blocking ring, and the blocking ring is slidably disposed in the groove. When the blocking ring is in the sealing position, the top of the friction pad abuts against the top of the groove, and the part of the top of the friction pad located outside the groove gradually narrows downward along the movement direction of the valve disc to form a scraping slope. A partition that does not interfere with the movement of the blocking ring is connected between the bottom of the blocking ring and the bottom of the groove.

[0018] By adopting the above technical solution, this structure not only achieves more stable driving of the blocking ring but also improves the density between the top of the blocking ring and the top of the groove. This minimizes the probability of particulate matter entering the space between the top of the blocking ring and the top of the groove during the scraping process, thus improving the scraping effect. Furthermore, when the front scraping section first squeezes the friction pad, the elastic deformation caused by the squeezing of the friction pad better drives the particulate matter to peel off from the side opposite to the blocking ring, resulting in a better peeling effect. The partitions prevent particulate matter from accumulating in the groove, ensuring the normal movement of the blocking ring.

[0019] The valve seat is further configured such that it forms a rear sealing surface that cooperates with the valve disc to form a seal at a position above the front sealing surface. A spraying structure is provided on the outside of the rear sealing surface inside the valve body. A control structure is provided on the spraying structure. A linkage control mechanism is connected between the control structure and the valve disc.

[0020] By adopting the above technical solution, as the service life of the front scraping section and the front sealing surface, as well as the sealing assembly, gradually decreases during use, a rear sealing surface is used to further seal the valve disc. The sequence is: the front scraping section and the front sealing surface form a seal, the sealing assembly forms a seal, and the rear sealing surface forms a seal. Because the amount of particulate matter that can enter the rear sealing surface increases proportionally with the decreasing service life of the first two seals, the sealing effectiveness of the valve can be further extended.

[0021] Furthermore, due to the effectiveness of the first two seals, very little particulate matter can enter the rear sealing surface. Therefore, a linkage control mechanism is used to control the spraying structure, ensuring optimal cleaning of the rear sealing surface before sealing. This significantly reduces damage to the rear sealing surface, guaranteeing its durability and reliability. The interaction between the front scraping section and the front sealing surface further extends the closing time of the rear sealing surface, providing ample time for the spraying structure to clean. Even after the effectiveness of the first two seals decreases considerably, the spraying structure's power exceeds the rate at which particulate matter enters the rear sealing surface, ensuring a good cleaning effect even after the lifespan of the first two seals is significantly shortened.

[0022] The spray structure is further configured as follows: the spray structure includes an air intake manifold, a plurality of air outlet nozzles connected to the air intake manifold and arranged in a circular pattern around the center of the valve seat, and a one-way cover plate installed at the outlet of the air outlet nozzle.

[0023] By adopting the above technical solution, the intake manifold draws in air, which is then ejected outward through nozzles at a high speed. This achieves the spraying and purging of the rear sealing surface and the valve disc at the sealing contact points with the rear sealing surface. During the ejection process, the airflow pushes the one-way cover to open, ensuring that the one-way cover does not interfere with the normal operation of the nozzle. When the nozzle is not discharging air, the one-way cover closes the nozzle to prevent the medium from clogging it.

[0024] The control structure is further configured as follows: an intake control rod is slidably disposed in the intake manifold and one end extends into the interior of the intake manifold; a sealing seat is provided in the intake manifold to cooperate with the intake control rod to form a seal; and a clamping spring is connected to the intake control rod to drive the intake control rod to seal the sealing seat.

[0025] By adopting the above technical solution, the intake control rod, in conjunction with the sealing seat, is used to control the opening and closing of the intake manifold.

[0026] The linkage control mechanism is further configured such that: a one-way control rod hinged to the valve disc, a linkage wedge formed outside the intake control rod, and a positioning spring connected to the one-way control rod; a portion of the movement path of the one-way control rod intersects with the linkage wedge to drive the intake control rod away from the sealing seat.

[0027] By adopting the above technical solution, the valve disc drives the one-way control rod to move towards the linkage inclined block. When the one-way control rod abuts against the inclined surface of the linkage inclined block, the inclined surface changes the direction of the force, thereby pulling the intake control rod away from the sealing seat to achieve the opening operation. This operation occurs after the front scraping part and the front sealing surface form a seal, but before the rear sealing surface forms a seal. When the valve is in the closed state, the linkage inclined block disengages from the one-way control rod, thereby controlling the intake manifold to close. During the valve disc's ascent, the one-way control rod abuts against the bottom of the linkage inclined block, thereby driving the hinged one-way control rod to rotate, ensuring that the one-way control rod does not interfere with the linkage inclined block, nor does it cause the linkage inclined block to move.

[0028] In summary, the present invention has the following beneficial effects: the present invention has a longer sealing effectiveness, thereby extending the service life of the valve and improving its practical performance. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of an embodiment; Figure 2 for Figure 1 Enlarged view of section A in the middle; Figure 3 for Figure 2 Enlarged view of section B in the middle; Figure 4 for Figure 1 Enlarged view of section C; Figure 5 This is a partial structural diagram of an embodiment.

[0030] In the diagram: 1. Valve body; 2. Valve cover; 3. Valve seat; 4. Valve stem; 5. Valve disc; 6. Drive spring; 7. Front sealing surface; 8. Front scraping section; 9. Sealing assembly; 91. Mounting groove; 92. Elastic seal; 93. Telescopic cavity; 10. Retaining ring; 11. Linkage assembly; 111. Linkage hole; 112. Linkage column; 113. Pressure linkage sleeve; 114. Pressure linkage cavity; 115. Linkage pressure block; 116. Re-linkage... 12. Friction pad; 13. Slide groove; 14. Scraping slope; 15. Rear sealing surface; 16. Spraying structure; 161. Inlet manifold; 162. Outlet nozzle; 163. One-way cover plate; 17. Control structure; 171. Inlet control lever; 172. Sealing seat; 173. Pressing spring; 18. Linkage control mechanism; 181. One-way control lever; 182. Linkage inclined block; 19. Partition plate; 20. Compression spring. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] refer to Figures 1 to 5A mine safety valve includes a valve body 1, a valve cover 2 fixedly installed in the valve body 1, a valve seat 3 integrally installed in the valve body 1, a valve stem 4 slidably installed in the valve cover 2, a valve disc 5 fixedly disposed at the end of the valve stem 4 facing the valve seat 3, and a drive spring 6 for driving the valve disc 5 to seal the valve seat 3. The drive spring 6 is installed inside the valve cover 2, and the valve stem 4 can only slide along the axis and cannot rotate circumferentially. A front sealing surface 7 extending along the movement direction of the valve disc 5 is formed on the valve seat 3, and a front scraping part 8 integrally formed on the valve disc 5 to form a sealing sliding fit with the front sealing surface 7. A retractable sealing component 9 is provided on the front sealing surface 7, and a blocking ring 10 is provided on the valve seat 3 on the side of the sealing component 9 near the movement path of the valve disc 5 for sealing damping sliding. The blocking ring 10 has a sealing position and a non-sealing position that blocks the sealing outside the sealing component 9. The blocking ring 10 and the front scraping part 8 are linked to realize the switching between the sealing position and the non-sealing position. The sealing assembly 9 has a sealing state that extends over the blocking ring 10 and abuts against the front scraping part 8, and an isolation state that is housed in the valve seat 3. The sealing assembly 9 is linked with the valve disc 5 through the linkage assembly 11 to switch between the sealing state and the isolation state.

[0033] The blocking ring 10 and the front scraping section 8 are in a damped sliding engagement. The sealing position of the blocking ring 10 is located on the non-sealed side near the valve stem 4. A friction pad 12, made of rubber, is fixedly provided on the side of the blocking ring 10 near the movement path of the valve disc 5. A groove 13 is provided on the valve seat 3 for the blocking ring 10 to slide in a sealing manner, and the blocking ring 10 is damped and slidably disposed within the groove 13. When the blocking ring 10 is in the sealing position, the top of the friction pad 12 abuts against the top of the groove 13, and the portion of the top of the friction pad 12 located outside the groove 13 gradually narrows downward along the movement direction of the valve disc 5, forming a scraping slope 14.

[0034] A spacer 19, which does not interfere with the movement of the blocking ring 10, is fixedly connected between the bottom of the blocking ring 10 and the bottom of the slide groove 13. The spacer 19 can be made of rubber or high-strength fabric and has creases to ensure that it can be folded and stored evenly, such as Kevlar fiber fabric. The friction between the blocking ring 10 and the front scraping part 8 is greater than the friction between the blocking ring 10 and the slide groove 13 plus the deformation resistance of the spacer 19, allowing the front scraping part 8 to drive the blocking ring 10 to slide within the slide groove 13. The friction between the blocking ring 10 and the slide groove 13 is greater than the deformation resistance of the spacer 19, allowing the blocking ring 10 to achieve real-time positioning after the force is lost.

[0035] The sealing assembly 9 includes a mounting groove 91 formed on the front sealing surface 7, an elastic seal 92 partially fixed in the mounting groove 91, and a telescopic cavity 93 formed in the elastic seal 92. The elastic seal 92 can extend and retract toward the side of the valve disc 5's movement path, and the elastic seal 92 is made of rubber. The linkage assembly 11 includes a pressure linkage structure set in the valve seat 3 and connected to the elastic seal 92, a plurality of linkage holes 111 set in the valve seat 3 and connecting the top of the valve seat 3 to the pressure linkage structure, and a plurality of linkage pins 112 slidably set on the valve disc 5 and corresponding one-to-one with the plurality of linkage holes 111. The plurality of linkage holes 111 are arranged in a circular distribution around the center of the valve seat 3. The valve disc 5 is provided with a compression spring 20 that drives each linkage pin 112 to move downward. The elastic force of the compression spring 20 is greater than that of the return spring 116, which drives the return spring 116 to compress.

[0036] The pressure linkage structure includes a pressure linkage sleeve 113 partially fixedly disposed within the valve seat 3, a pressure linkage cavity 114 formed within the pressure linkage sleeve 113, a plurality of linkage blocks 115 slidably disposed in each linkage hole 111 and located above the pressure linkage sleeve 113, and a return spring 116 installed within the pressure linkage cavity 114 for resetting the linkage blocks 115. The pressure linkage sleeve 113 extends into the linkage hole 111 and is fixedly connected to the linkage blocks 115. The pressure linkage cavity 114 is connected to the telescopic cavity 93. The two ends of the return spring 116 are fixedly connected to the pressure linkage sleeve 113, and the pressure linkage sleeve 113 is a rubber bladder.

[0037] The valve seat 3, located above the front sealing surface 7, forms a rear sealing surface 15 that cooperates with the valve disc 5 to form a seal. A spray structure 16 is located inside the valve body 1, outside the rear sealing surface 15. A control structure 17 is provided on the spray structure 16, and a linkage control mechanism 18 connects the control structure 17 and the valve disc 5. The spray structure 16 includes an intake manifold 161 fixedly installed on the valve body 1, several exhaust nozzles 162 fixedly installed on the intake manifold 161 and arranged in a circular pattern around the center of the valve seat 3, and a one-way cover plate 163 hinged to the outlet of the exhaust nozzles 162 via a rotating shaft. A torsion spring is fitted on the rotating shaft to drive the one-way cover plate 163 to close the outlet of the exhaust nozzles 162. The two ends of the torsion spring are fixedly connected to the one-way cover plate 163 and the exhaust nozzles 162, respectively.

[0038] The control structure 17 includes an intake control rod 171 that is slidably disposed in the intake manifold 161 and extends into the interior of the intake manifold 161 at one end; a sealing seat 172 integrally disposed in the intake manifold 161 to form a seal with the intake control rod 171; and a retaining spring 173 connected to the intake control rod 171 for driving the intake control rod 171 to seal the sealing seat 172. The retaining spring 173 is fitted onto the intake control rod 171 and its two ends abut against the intake control rod 171 and the inner wall of the intake manifold 161, respectively. The intake manifold 161 is supplied with air from an external air source.

[0039] The linkage control mechanism 18 includes a one-way control lever 181 hinged to the valve disc 5 via a pivot, a linkage wedge 182 integrally formed outside the intake control lever 171, and a positioning spring (not shown in the figure) connecting the one-way control lever 181. The positioning spring is a torsion spring fitted onto the pivot, with its two ends fixedly connected to the one-way control lever 181 and the valve disc 5, respectively. A portion of the movement path of the one-way control lever 181 intersects with the linkage wedge 182 to drive the intake control lever 171 away from the sealing seat 172. After the downward-moving one-way control lever 181 passes the linkage wedge 182, the one-way control lever 181 separates from the linkage wedge 182, thereby resetting the intake control lever 171 to close the intake manifold 161. When the one-way control lever 181 moves upward and abuts against the lower part of the linkage wedge 182, the one-way control lever 181 rotates, allowing it to move above the linkage wedge 182.

[0040] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A mine safety valve, comprising a valve body (1), a valve cover (2) mounted on the valve body (1), a valve seat (3) mounted inside the valve body (1), a valve stem (4) slidably mounted on the valve cover (2), a valve disc (5) disposed on the end of the valve stem (4) facing the valve seat (3), and a drive spring (6) for driving the valve disc (5) to seal the valve seat (3), characterized in that: The valve seat (3) has a front sealing surface (7) extending along the movement direction of the valve disc (5). The valve disc (5) has a front scraping part (8) that forms a sealing sliding fit with the front sealing surface (7). The front sealing surface (7) is provided with a retractable sealing assembly (9). The valve seat (3) is provided with a sealing damping sliding block ring (10) on the side of the sealing assembly (9) near the movement path of the valve disc (5). The block ring (10) has a sealing position and a non-sealing position that block the sealing outside the sealing assembly (9). The block ring (10) and the front scraping part (8) are linked to achieve switching between the sealing position and the non-sealing position. The sealing assembly (9) has a sealing state that extends through the block ring (10) and abuts against the front scraping part (8) and an isolation state that is housed in the valve seat (3). The sealing assembly (9) is linked with the valve disc (5) through the linkage assembly (11) to achieve switching between the sealing state and the isolation state.

2. The mine safety valve according to claim 1, characterized in that: The blocking ring (10) and the front scraping part (8) are in a damped sliding fit. The sealing position of the blocking ring (10) is located on the side of the non-sealing position close to the valve stem (4). The blocking ring (10) is provided with a friction pad (12) on the side of the movement path of the valve disc (5).

3. The mine safety valve according to claim 1, characterized in that: The sealing assembly (9) includes a mounting groove (91) disposed on the front sealing surface (7), an elastic seal (92) disposed in the mounting groove (91), and a telescopic cavity (93) formed in the elastic seal (92). The elastic seal (92) can extend and retract toward the side of the valve disc (5) movement path.

4. The mine safety valve according to claim 3, characterized in that: The linkage assembly (11) includes a pressure linkage structure disposed in the valve seat (3) and connected to the elastic seal (92), a plurality of linkage holes (111) opened in the valve seat (3) and connected to the top of the valve seat (3) and the pressure linkage structure, and a plurality of linkage pins (112) that move with the valve disc (5) and correspond one-to-one with the plurality of linkage holes (111). The linkage pins (112) are slidably disposed on the valve disc (5) and are connected to a compression spring (20) that drives the linkage pins (112) to move downward.

5. The mine safety valve according to claim 4, characterized in that: The pressure linkage structure includes a pressure linkage sleeve (113) disposed in the valve seat (3), a pressure linkage cavity (114) formed in the pressure linkage sleeve (113), a plurality of linkage blocks (115) that are slidably disposed in each linkage hole (111) and located above the pressure linkage sleeve (113), and a reset spring (116) installed in the pressure linkage cavity (114) for resetting the linkage blocks (115). The pressure linkage sleeve (113) extends into the linkage hole (111), and the pressure linkage cavity (114) is connected to the telescopic cavity (93).

6. The mine safety valve according to claim 2, characterized in that: The valve seat (3) is provided with a sliding groove (13) for the sealing sliding of the blocking ring (10), and the blocking ring (10) is slidably disposed in the sliding groove (13). When the blocking ring (10) is in the sealing position, the top of the friction pad (12) abuts against the top of the sliding groove (13), and the part of the top of the friction pad (12) located outside the sliding groove (13) gradually narrows downward along the movement direction of the valve disc (5) and forms a scraping slope (14). A partition (19) that does not interfere with the movement of the blocking ring (10) is connected between the bottom of the blocking ring (10) and the bottom of the sliding groove (13).

7. The mine safety valve according to claim 1, characterized in that: The valve seat (3) is located above the front sealing surface (7) to form a rear sealing surface (15) that cooperates with the valve disc (5) to form a seal. The valve body (1) is provided with a spray structure (16) located outside the rear sealing surface (15). The spray structure (16) is provided with a control structure (17). The control structure (17) and the valve disc (5) are connected by a linkage control mechanism (18).

8. The mine safety valve according to claim 7, characterized in that: The spray structure (16) includes an air intake manifold (161), a plurality of air outlet nozzles (162) connected to the air intake manifold (161) and arranged in a circular pattern around the center of the valve seat (3), and a one-way cover plate (163) installed at the outlet of the air outlet nozzles (162).

9. The mine safety valve according to claim 8, characterized in that: The control structure (17) includes an intake control rod (171) that is slidably disposed in the intake manifold (161) and extends into the intake manifold (161) at one end; a sealing seat (172) provided in the intake manifold (161) to cooperate with the intake control rod (171) to form a seal; and a clamping spring (173) connected to the intake control rod (171) for driving the intake control rod (171) to seal the sealing seat (172).

10. The mine safety valve according to claim 9, characterized in that: The linkage control mechanism (18) includes a one-way control lever (181) hinged to the valve disc (5), a linkage wedge (182) formed outside the intake control lever (171), and a positioning spring connected to the one-way control lever (181). A portion of the movement path of the one-way control lever (181) intersects with the linkage wedge (182) to drive the intake control lever (171) away from the sealing seat (172).

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