Explosion-proof valve and pressure relief method

Abstract

The invention discloses an anti-explosion valve and a pressure relief method, and belongs to the technical field of valves, the anti-explosion valve comprises a valve seat, a valve disc assembly, a supporting assembly and a flame retardant device assembly, and the valve seat is provided with a relief hole; the valve disc assembly is arranged on one side of the valve seat and comprises a first disc body part, a second disc body part and a connecting part. Through the first disc body part and the second disc body part which are arranged in a spaced mode, the first disc body part covers and seals the discharge hole, the second disc body part is connected with the first disc body part through the connecting part, the elastic part abuts against the second disc body part, and the second disc body part transmits extrusion force to the first disc body part through the connecting part; the elastic part does not need to be directly connected with the first disc body part, so that the influence of high temperature on the first disc body part on the elastic part is reduced, the performance of the elastic part is guaranteed, and the explosion-proof valve has stable explosion pressure. When the discharge hole is opened and the airflow is discharged outwards through the flame-retardant device assembly, flame extinguishing treatment can be carried out on the airflow through the flame-retardant device assembly.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to an explosion-proof valve and a pressure relief method. Background Technology

[0002] Explosion-proof valves, as important safety protection devices, are widely used in pipelines, containers, and confined spaces containing flammable and explosive gases or dust, such as diesel engine crankcases and gas engine intake and exhaust pipes. Their main function is to promptly release high-temperature, high-pressure gas flows and prevent flame propagation in the event of an explosion or sudden pressure increase within the system, thereby ensuring the safe operation of equipment and personal safety. However, during use, the high-temperature gas flow can affect the performance of the spring in the explosion-proof valve. Summary of the Invention

[0003] This application provides an explosion-proof valve and a pressure relief method to solve the technical problem that high-temperature airflow can affect the performance of the spring on the explosion-proof valve.

[0004] To achieve the above objectives, according to a first aspect of this application, an explosion-proof valve is provided, comprising:

[0005] Valve seat with vent hole; A valve disc assembly is disposed on one side of the valve seat. The valve disc assembly includes a first disc body, a second disc body, and a connecting part. The first disc body covers the opening of the vent hole and is connected to the valve seat. The second disc body is disposed at a distance from the first disc body on the side away from the valve seat. The second disc body is connected to the first disc body through the connecting part. A support assembly is disposed on the same side of the valve seat as the valve disc assembly. The support assembly includes an elastic portion that abuts against the side of the second disc portion opposite to the first disc portion.

[0006] In some embodiments, the support component further includes: The valve cover portion is disposed on the side of the elastic portion opposite to the second disc body portion and is connected to the elastic portion; The limiting part is connected to the side of the valve cover portion facing the second disc portion and is spaced apart from the second disc portion.

[0007] In some embodiments, the valve seat includes a base plate and a sealing portion, the vent hole is disposed through the base plate, the base plate has a sealing groove on the side facing the first disc portion, the sealing portion is disposed in the sealing groove and connected to the base plate; The first disc body includes a plate and a flange. The flange is located on the side of the plate facing the sealing part and is arranged along the circumference of the plate. The plate is sealed to the sealing part through the flange.

[0008] In some embodiments, the number of elastic portions is multiple, and the multiple elastic portions are arranged at intervals along the circumferential direction of the second disk portion.

[0009] In some embodiments, the explosion-proof valve further includes: A flame retardant assembly is disposed around the valve disc assembly and connected to the valve seat. The flame retardant assembly includes a plurality of flame retardant sheets stacked along the axial direction. At least one side of each flame retardant sheet is provided with a plurality of flow guiding units, and the plurality of flow guiding units are arranged at intervals along the circumference of the flame retardant sheet. Each of the flow guiding units is configured such that when the airflow pushes open the first disc portion and flows into the flame retardant sheet, the flow guiding unit changes the flow direction of the airflow located in the flame retardant sheet, so that at least a portion of the flow path of the airflow is inclined to the radial direction of the flame retardant sheet.

[0010] In some embodiments, the flame retardant sheet has a first large surface and a second large surface arranged opposite to each other, and the flow guiding unit is provided on the first large surface and the second large surface. The first large surfaces on two adjacent flame retardant sheets are arranged facing each other, or the second large surfaces on two adjacent flame retardant sheets are arranged facing each other. The orthographic projections of the flow guiding units on two adjacent flame-retardant sheets onto a plane perpendicular to the axial direction do not at least partially overlap.

[0011] In some embodiments, the flow guiding unit includes a plurality of flow channels. The first large surface forms a plurality of protrusions on the side facing away from the second large surface, and the flow channels are formed by enclosing two adjacent protrusions. The second large surface is recessed in the direction facing the first large surface to form the flow channels. The flow channels on the first large surface and the flow channels on the second large surface are misaligned. The air inlet of the flow channel is connected to the airflow cavity of the flame retardant sheet, and the orientation of the air inlet is inclined to the radial direction of the flame retardant sheet.

[0012] In some embodiments, in the axial direction of the flame retardant sheet, the flow channel on one of the flame retardant sheets intersects with at least one flow channel on an adjacent flame retardant sheet, and communicates with each other at the intersection. Wherein, when any one of the flow channels on the flame-retardant sheet intersects with multiple flow channels on adjacent flame-retardant sheets, the flow space of the airflow along the flow path alternately increases and decreases.

[0013] In some embodiments, the overcurrent channel includes: The first flow channel is connected to the airflow cavity, and the extension direction of the first flow channel is inclined to the radial direction of the flame retardant sheet; A second flow channel is connected to the first flow channel, and the extension direction of the second flow channel is at least partially inclined to the extension direction of the first flow channel.

[0014] In some embodiments, the second flow channel includes a plurality of sub-flow channels, which are connected in sequence, and the extension directions of two connected sub-flow channels are inclined to each other; One of the sub-channels is connected to the first channel and is inclined relative to the extension direction of the first channel.

[0015] In some embodiments, the angle between the orientation of the air inlet of the flow channel and the radial direction of the flame retardant sheet is A, satisfying: 20°≤A≤40°.

[0016] In some embodiments, the extension direction of the flow channel can be straight, V-shaped, or wavy, and the cross-sectional shape of the flow channel can be arc-shaped, trapezoidal, or triangular.

[0017] In some embodiments, the flame retardant assembly further includes: At least one first plate is disposed on the axial direction of the flame retardant sheet, and the first plate is disposed between two adjacent flame retardant sheets and connected to the two adjacent flame retardant sheets respectively.

[0018] In some embodiments, the flow guiding unit is configured as a protrusion formed on the first large surface and the second large surface, wherein the protrusion on the first large surface and the protrusion on the second large surface are misaligned, and the protrusion is used to block the airflow in the flame retardant sheet so that at least a portion of the flow path of the airflow is inclined to the radial direction of the flame retardant sheet.

[0019] In some embodiments, on two adjacent flame-retardant sheets, the protrusions on the two opposing first large surfaces are staggered, or the protrusions on the two opposing second large surfaces are staggered.

[0020] In some embodiments, the flame retardant assembly further includes: At least one second plate is disposed between two adjacent flame-retardant sheets along the axial direction of the flame-retardant sheet and is connected to each of the two adjacent flame-retardant sheets.

[0021] In some embodiments, the flame retardant sheet includes a plurality of arc segments, which are sequentially connected to form an annular flame retardant sheet, and each arc segment is provided with the flow guiding unit; Each of the arc-shaped segments has a splicing part at both ends, and the splicing parts on two adjacent arc-shaped segments are connected along the circumference of the flame-retardant sheet.

[0022] In some embodiments, the splicing part can be stepped or sawtooth-shaped.

[0023] In some embodiments, the explosion-proof valve further includes an inner support ring and an outer support ring, the inner support ring and the outer support ring being connected to the valve seat respectively, the inner support ring and the outer support ring being provided with a plurality of exhaust channels, the inner support ring being spaced apart inside the outer support ring, and the inner support ring and the outer support ring enclosing each other to form an installation space, the flame retardant assembly being disposed within the installation space.

[0024] In some embodiments, the explosion-proof valve further includes a retaining ring, on which a plurality of exhaust channels are provided. The retaining ring is spaced apart inside the inner support ring and also encloses the mounting space between the retaining ring and the inner support ring for mounting the flame retardant assembly. The number of fixing rings is multiple, the radii of the multiple fixing rings are different, and they share the same axis. The installation space is formed between two adjacent fixing rings for installing the flame retardant assembly.

[0025] According to a second aspect of this application, a method for relieving pressure on an explosion-proof valve is provided, applied to the explosion-proof valve described in any one of the above-mentioned methods, the method comprising: The valve seat of the explosion-proof valve is installed on the pipeline or equipment. The elastic part of the explosion-proof valve applies a pre-tightening force to the second disc part, so that the first disc part covers the vent hole on the valve seat and maintains a sealed connection with the valve seat. When an explosion occurs in a pipeline or equipment, causing the internal pressure to exceed a set value, the explosion gas flow pushes the first disc body to overcome the pre-tightening force of the elastic part, causing the first disc body to separate from the valve seat, the vent hole is opened, and the explosion gas flow is released outward through the vent hole. When the pressure inside the pipeline or equipment drops below the set value, the elastic part pushes the valve disc assembly to reset, so that the first disc body is re-sealed with the valve seat, and the vent hole is closed.

[0026] The explosion-proof valve of this embodiment includes a valve seat, a valve disc assembly, and a support assembly. The valve seat has a vent hole. The valve disc assembly is disposed on one side of the valve seat and includes a first disc portion, a second disc portion, and a connecting portion. The first disc portion covers the opening of the vent hole and is connected to the valve seat. The second disc portion is spaced apart from the first disc portion on the side opposite to the valve seat and is connected to the first disc portion via the connecting portion. The support assembly is disposed on the same side of the valve seat as the valve disc assembly and includes an elastic portion that abuts against the side of the second disc portion opposite to the first disc portion. The spaced-apart first and second disc portions allow the first disc portion to cover the vent hole, and the second disc portion to be connected to the first disc portion via the connecting portion. The elastic portion abuts against the second disc portion, and the second disc portion transmits the compressive pressure to the first disc portion via the connecting portion. This eliminates the need for the elastic portion to be directly connected to the first disc portion, thereby reducing the impact of the high temperature on the first disc portion on the elastic portion, ensuring the performance of the elastic portion, and enabling the explosion-proof valve to have a stable burst pressure. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0029] Figure 1 This is a front sectional view of the explosion-proof valve provided in an exemplary embodiment of this disclosure; Figure 2 This is a schematic diagram of the connection between the valve seat and the valve disc assembly provided in an exemplary embodiment of this disclosure; Figure 3 This is provided in the exemplary embodiments of this disclosure. Figure 2 Enlarged view of a portion of area A in the middle; Figure 4 This is a front sectional view of the first disc body provided in an exemplary embodiment of this disclosure; Figure 5 This is a schematic diagram of the structure of a flame retardant assembly provided in an exemplary embodiment of this disclosure, wherein multiple layers of flame retardant sheets are stacked. Figure 6 This is a three-dimensional structural diagram of a single flame-retardant sheet provided in an exemplary embodiment of this disclosure; Figure 7 This is a front view of a single flame-retardant sheet provided in an exemplary embodiment of this disclosure; Figure 8 This is provided in the exemplary embodiments of this disclosure. Figure 6 Enlarged view of a section in area B; Figure 9 This is a schematic diagram of the structure of multiple flame-retardant sheets placed in opposite directions according to an exemplary embodiment of this disclosure; Figure 10 This is a schematic diagram of the structure when the flow channels on two adjacent flame-retardant sheets are arranged in an intersecting manner, as provided in an exemplary embodiment of this disclosure; Figure 11 This is a front view of a single flame-retardant sheet provided in an exemplary embodiment of this disclosure, wherein the flow channel includes a first flow channel and a second flow channel; Figure 12 This is provided in the exemplary embodiments of this disclosure. Figure 11 A magnified view of a section in area C; Figure 13 This is a front view of a single flame retardant sheet provided in an exemplary embodiment of this disclosure, wherein the second flow channel includes a plurality of sub-flow channels; Figure 14 This is provided in the exemplary embodiments of this disclosure. Figure 13 A magnified view of a section in area D; Figure 15 This is a schematic diagram of the arc-shaped segment that makes up the flame retardant sheet when an overflow channel is provided on the flame retardant sheet provided in the exemplary embodiment of this disclosure; Figure 16 This is a schematic diagram of a trapezoidal cross-section of the flow channel provided in an exemplary embodiment of this disclosure; Figure 17 This is a schematic diagram of a cross-section of an arc-shaped flow channel provided in an exemplary embodiment of this disclosure; Figure 18 This is a schematic diagram of a triangular cross-section of the flow channel provided in an exemplary embodiment of this disclosure; Figure 19 This is a schematic diagram of the structure of a flame retardant sheet and a first flat plate stacked together in an exemplary embodiment of this disclosure, wherein the flame retardant sheet is provided with a flow channel; Figure 20 This is a schematic diagram of the structure when the flame-retardant sheet and the first flat plate are placed in an exemplary embodiment of this disclosure, wherein the flame-retardant sheet is provided with a flow channel; Figure 21 This is provided in the exemplary embodiments of this disclosure. Figure 19 A magnified view of a section in area E; Figure 22 This is a perspective view of a flame-retardant sheet provided in an exemplary embodiment of this disclosure, wherein a plurality of bosses are provided on the flame-retardant sheet; Figure 23This is a schematic diagram of the structure of the arc-shaped segment that makes up the flame retardant sheet when the flame retardant sheet provided in the exemplary embodiment of this disclosure has a boss. Figure 24 This is a side view of the flame retardant sheet provided in the exemplary embodiments of this disclosure when a boss is provided on the flame retardant sheet; Figure 25 This is a partial structural cross-sectional view of the flame retardant sheet provided in the exemplary embodiment of this disclosure when a boss is provided on it; Figure 26 This is a schematic diagram of the structure of a flame-retardant sheet and a second flat plate stacked together, provided in an exemplary embodiment of this disclosure, wherein the flame-retardant sheet is provided with a boss; Figure 27 This is a perspective view of the second flat plate provided in an exemplary embodiment of this disclosure; Figure 28 This is a perspective view of the inner support ring and the outer support ring provided in the exemplary embodiments of this disclosure; Figure 29 This is a perspective view of the inner support ring and multiple fixing rings provided in an exemplary embodiment of this disclosure; Figure 30 This is a flowchart of the explosion-proof valve venting method provided in an exemplary embodiment of this disclosure.

[0030] Explanation of reference numerals in the attached figures: 10-Valve seat; 11-Vent hole; 12-Base plate; 121-Sealing groove; 13-Sealing part; 20-Valve disc assembly; 21-First disc body; 211-Plate; 212-Flange; 22-Second disc body; 23-Connecting part; 30-Support assembly; 31-Elastic part; 32-Valve cover; 33-Limiting part; 40-Flame retardant assembly; 41-Flame retardant sheet; 411-First large surface; 412-Second large surface; 413-Airflow chamber; 41 4-Arc-shaped segment; 415-Splicing part; 42-Flow guide unit; 421-Flow passage; 422-Air inlet; 423-Intersection position; 424-First flow channel; 425-Second flow channel; 426-Sub-flow channel; 427-Boss; 43-First flat plate; 44-Second flat plate; 50-Inner support ring; 60-Outer support ring; 61-Exhaust passage; 62-Installation space; 70-Fixing ring; X-Axis; Y-Central axis; Z-Center line. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0032] Explosion-proof valves, as important safety protection devices, are widely used in pipelines, containers, and confined spaces containing flammable and explosive gases or dust, such as diesel engine crankcases and gas engine intake and exhaust pipes. Their main function is to promptly release high-temperature, high-pressure gas flows and prevent flame propagation in the event of an explosion or sudden pressure increase within the system, thereby ensuring the safe operation of equipment and personal safety. However, during use, the explosion-proof valve uses a spring to apply preload to the valve disc, ensuring a stable seal of the vent hole on the valve seat. The valve disc comes into direct contact with the high-temperature gas flow within the pipeline or equipment, causing a continuous rise in its temperature. This, in turn, raises the temperature of the spring connected to the valve disc, affecting its performance and altering the preload force applied to the valve disc. Consequently, the accuracy of the preset opening pressure of the explosion-proof valve decreases.

[0033] Please see Figure 1 and Figure 2 This application provides an explosion-proof valve, including a valve seat 10, a valve disc assembly 20, and a support assembly 30. The valve seat 10 has a vent hole 11. The valve disc assembly 20 is disposed on one side of the valve seat 10 and includes a first disc portion 21, a second disc portion 22, and a connecting portion 23. The first disc portion 21 covers the opening of the vent hole 11 and is connected to the valve seat 10. The second disc portion 22 is spaced apart from the first disc portion 21 on the side opposite to the valve seat 10 and is connected to the first disc portion 21 via the connecting portion 23. The support assembly 30 is disposed on the same side of the valve seat 10 as the valve disc assembly 20 and includes an elastic portion 31 that abuts against the side of the second disc portion 22 opposite to the first disc portion 21.

[0034] Understandably, the valve disc assembly 20 is disposed on one side of the valve seat 10, for example, on the top of the valve seat 10. The first disc portion 21 on the valve disc assembly 20 covers the opening of the vent hole 11 on the valve seat 10 and forms a sealed connection with the valve seat 10. The second disc portion 22 is fixedly connected to the first disc portion 21 through the connecting portion 23, and a gap is maintained between the second disc portion 22 and the first disc portion 21, so that the second disc portion 22 does not directly contact the first disc portion 21. The support assembly 30 is also located on the top of the valve seat 10, and the bottom end of the elastic portion 31 on the support assembly 30 directly abuts against the surface of the second disc portion 22 facing away from the first disc portion 21. The elastic part 31 can be an elastic structure such as a spring. One elastic part 31 can be provided, with its bottom end abutting against the center position of the second disc part 22. The number of elastic parts 31 can also be multiple. Multiple elastic parts 31 are arranged at intervals along the circumference of the second disc part 22, and apply the same downward compressive force to different positions on the second disc part 22, so that the second disc part 22 can be subjected to uniform force. Alternatively, a portion of the multiple elastic parts 31 are arranged at intervals along the circumference of the second disc part 22, while one of the multiple elastic parts 31 abuts against the center position of the second disc part 22.

[0035] By separating the first disc portion 21 and the second disc portion 22 on the valve disc assembly 20, the first disc portion 21 directly contacts the high-temperature airflow in the pipeline or equipment, causing its temperature to rise. Meanwhile, the elastic portion 31, in direct contact with the second disc portion 22, reduces the impact of the heat from the first disc portion 21 on the elastic portion 31. This spaced arrangement effectively increases the length and thermal resistance of the heat conduction path, reducing the direct transfer of high temperature from the first disc portion 21 to the second disc portion 22. This provides a relatively low-temperature working environment for the elastic portion 31 connected to the second disc portion 22, allowing it to maintain good performance. The elastic portion 31 acts directly on the second disc portion 22, and its preload is transmitted to the first disc portion 21 through the connecting portion 23. This allows the first disc portion 21 to compress the valve seat 10, achieving both the reset function of the first disc portion 21 and a sealing connection with the valve seat 10. The connecting part 23 can be made of heat-insulating materials such as polyurethane or foam ceramic, which can further reduce the impact of the high temperature on the first disc part 21 on the second disc part 22. There can be one or more connecting parts 23, which are arranged along the circumference of the first disc part 21 and connected to the first disc part 21 and the second disc part 22 respectively, so as to improve the uniformity of force transmission.

[0036] The force transmission method in the above structure eliminates the need for the elastic part 31 to directly contact the high-temperature structure, greatly reducing problems such as annealing of the elastic part 31 material, changes in elastic modulus, or fatigue life reduction caused by high temperatures, thus ensuring the long-term stability of the elastic part 31's performance. The stability of the elastic part 31's performance ensures the accuracy and consistency of its pre-tightening force on the valve disc assembly 20, keeping the explosion-proof valve's start-up burst pressure value stable and improving the valve's reliability. Furthermore, this separate structure allows for the selection of appropriate materials for the first disc part 21 and the second disc part 22 according to different operating conditions, such as materials with high temperature resistance, corrosion resistance, and structural strength, thereby improving the overall reliability of the structure.

[0037] Please see Figure 1 In conjunction with the above embodiments, in some embodiments, the support assembly 30 further includes a valve cover portion 32 and a limiting portion 33. The valve cover portion 32 is disposed on the side of the elastic portion 31 opposite to the second disc body portion 22 and is connected to the elastic portion 31. The limiting portion 33 is connected to the side of the valve cover portion 32 facing the second disc body portion 22 and is spaced apart from the second disc body portion 22. The limiting portion 33 may be a rod-shaped structure.

[0038] Understandably, the support assembly 30 typically includes multiple support rod structures, all of which are connected to the valve cover portion 32 to support it. The valve cover portion 32 is located on top of the second disc portion 22 and is spaced apart from it. The top ends of the elastic portion 31 and the limiting portion 33 are both connected to the valve cover portion 32. The limiting portion 33 is a rod-shaped structure. When the first disc portion 21 covers the vent hole 11, the bottom end of the limiting portion 33 maintains a preset distance from the second disc portion 22.

[0039] When an explosion occurs inside a pipeline or equipment, the high-pressure gas flow inside the pipeline or equipment pushes the first disc portion 21 and moves the entire valve disc assembly 20, compressing the elastic portion 31. Once the second disc portion 22 moves to contact the limiting portion 33, the movement of the second disc portion 22 is stopped by the limiting portion 33, thereby limiting the maximum compression degree of the elastic portion 31. The limiting effect of this structure effectively reduces the risk of plastic deformation, stress relaxation, or fatigue damage caused by excessive compression of the elastic portion 31, allowing the elastic portion 31 to push the valve disc assembly 20 back to its original position by its own elastic potential energy after the explosion-proof valve is depressurized, achieving reliable sealing and reset. In addition, limiting the compression degree of the elastic portion 31 also indirectly stabilizes the maximum opening height of the valve disc, making the area of ​​the venting channel controllable, and working in conjunction with the flame retardant assembly 40 described below to optimize the flame quenching effect.

[0040] Please see Figure 2 , Figure 3 and Figure 4In conjunction with the above embodiments, in some embodiments, the valve seat 10 includes a base plate 12 and a sealing portion 13. A vent hole 11 is disposed through the base plate 12. The base plate 12 has a sealing groove 121 on the side facing the first disc portion 21. The sealing portion 13 is disposed in the sealing groove 121 and connected to the base plate 12. The first disc portion 21 includes a plate 211 and a flange 212. The flange 212 is located on the side of the plate 211 facing the sealing portion 13 and is disposed along the circumference of the plate 211. The plate 211 is sealed to the sealing portion 13 through the flange 212.

[0041] It is understandable that the sealing groove 121 and sealing part 13 opened on the substrate 12 can both be configured as annular structures, and the flange 212 on the plate 211 can also be configured as annular structures protruding towards the sealing part 13, so that the protruding flange 212 can squeeze the sealing part 13, thereby ensuring the sealing of the connection between the first disc part 21 and the valve seat 10.

[0042] When an explosion occurs inside the pipeline or equipment, the high-temperature, high-pressure airflow pushes the first disc body 21 open, and the airflow rushes upward through the vent hole 11. Since the sealing contact point is formed by the flange 212 pressing against the sealing part 13 in the sealing groove 121, the airflow will not directly impact the sealing part 13 when it rushes out, which can reduce the erosion, thermal shock and wear of the sealing part 13 material by the airflow, effectively extending its service life and ensuring that the valve disc assembly 20 can reliably reset and seal after multiple operations. Secondly, the contact area between the annular flange 212 and the sealing part 13 at the contact point is small, which allows the flange 212 to generate greater local pressure under the same spring preload, thereby achieving a better sealing effect.

[0043] Furthermore, by embedding the sealing part 13 into the sealing groove 121, the positioning is accurate during installation and use, and it is not easy to shift. At the same time, the lateral constraint of the groove wall on the sealing part 13 can limit the sealing part 13 to undergo elastic deformation only along the extrusion direction when it is under pressure, thereby obtaining a more stable and uniform sealing contact surface.

[0044] Please see Figure 5 and Figure 6 In conjunction with the above embodiments, in some embodiments, the explosion-proof valve further includes a flame retardant assembly 40. The flame retardant assembly 40 is disposed around the valve disc assembly 20 and connected to the valve seat 10. The flame retardant assembly 40 includes a plurality of flame retardant sheets 41 stacked along the axial direction X. At least one side of each flame retardant sheet 41 is provided with a plurality of flow guiding units 42, which are arranged at circumferential intervals along the flame retardant sheet 41. Each flow guiding unit 42 is configured such that when airflow pushes open the first disc body portion 21 and flows into the flame retardant sheet 41, the flow guiding unit 42 changes the flow direction of the airflow within the flame retardant sheet 41, so that at least a portion of the airflow path is inclined to the radial direction of the flame retardant sheet 41.

[0045] It is understandable that multiple flame-retardant sheets 41 are stacked along the axial direction X, and each flame-retardant sheet 41 is provided with multiple through holes, and the corresponding through holes on the multiple flame-retardant sheets 41 are interconnected to facilitate the passage of the screw, so that the multiple flame-retardant sheets 41 can be connected into a whole by the screw and nut. An inner support ring 50 and an outer support ring 60 are also provided on the explosion-proof valve, such as... Figure 28 As shown, the inner support ring 50 is disposed inside the outer support ring 60, and the two enclose an installation space 62. This installation space 62 is annular, conforming to the shape of the overall structure formed by the multiple flame-retardant plates 41, allowing the entire structure to be placed within the installation space 62, thus facilitating the installation, use, disassembly, and maintenance of the explosion-proof valve. The overall structure formed by the multiple flame-retardant plates 41 can be connected to the inner support ring 50 and the outer support ring 60 individually, or it can be spaced apart from them. Multiple exhaust channels 61 are provided on both the inner support ring 50 and the outer support ring 60. These exhaust channels 61 can break up and even out the explosive gas flow, improving the flame quenching effect in conjunction with the multiple flame-retardant plates 41. The cross-sectional shape of the exhaust channels 61 can be circular, rectangular, triangular, rhomboid, honeycomb, etc., with no restrictions on its cross-sectional shape. Simultaneously, the outer support ring 60 also protects the multiple flame-retardant plates 41.

[0046] like Figure 29 As shown, the explosion-proof valve may also include fixing rings 70, which are spaced apart inside the inner support ring 50 and together with the inner support ring 50 form an installation space 62 for mounting flame retardant components 40. This results in the explosion-proof valve forming a composite structure with multiple inner and outer flame retardant components 40. The explosive gas flow needs to pass through multiple inner and outer flame retardant components 40 before it can be discharged, which can further improve the flame extinguishing effect of the explosion-proof valve. The fixing rings 70 are also provided with multiple exhaust channels 61, which also serve to break up and even out the explosive gas flow. Multiple fixing rings 70 can be provided, with different radii, but sharing the same centerline Z. The installation space 62 formed between two adjacent fixing rings 70 is used to mount the flame retardant components 40. Users can increase the number of flame retardant components 40 and fixing rings 70 as needed to improve the flame extinguishing effect.

[0047] Each flame-retardant sheet 41 has multiple flow-guiding units 42 on one side in the axial direction X, or multiple flow-guiding units 42 on both sides in the axial direction X. These flow-guiding units 42 are arranged at intervals along the circumference of the flame-retardant sheet 41. The structure of each flow-guiding unit 42 is configured such that when an airflow carrying flames or high temperatures enters the interior of the flame-retardant sheet 41, the flow-guiding unit 42 can directly physically block and guide the airflow, forcibly changing its original flow direction, so that at least part of the airflow path no longer flows in a straight radial direction along the flame-retardant sheet 41, but flows at an angle to the radial direction, or even deflects, swirls or splits the flow.

[0048] When the flow guiding unit 42 changes the flow path of the airflow, it will collide and rub violently with the airflow. In this process, some of the kinetic and thermal energy of the airflow is consumed, thus effectively reducing the energy of the airflow and improving the flame extinguishing effect. Secondly, the flow guiding unit 42 forces the airflow to change direction, from a simple radial straight path to a tortuous inclined or rotating path, significantly extending the actual flow distance and residence time of the airflow inside the flame-retardant plate 41. This allows for more thorough heat exchange between the airflow and the flame-retardant plate 41, enabling more effective absorption and dissipation of heat, further reducing the airflow temperature. Furthermore, the regular distribution and synergistic effect of multiple flow guiding units 42 allow the airflow to form local turbulence or disturbance within the flow channel, disrupting the stability of flame propagation and further increasing the dissipation of heat and kinetic energy.

[0049] Please see Figure 6 and Figure 9 In conjunction with the above embodiments, in some embodiments, the flame-retardant sheet 41 has a first large surface 411 and a second large surface 412 arranged opposite to each other. A flow-guiding unit 42 is disposed on the first large surface 411 and the second large surface 412. The first large surface 411 on two adjacent flame-retardant sheets 41 are arranged facing each other, or the second large surface 412 on two adjacent flame-retardant sheets 41 are arranged facing each other. The orthographic projections of the flow-guiding units 42 on two adjacent flame-retardant sheets 41 onto a plane perpendicular to the axial direction X are at least partially non-overlapping.

[0050] It is understood that the first large surface 411 can be one of the upper or lower surface of the flame-retardant sheet 41, and the second large surface 412 can be the other of the upper or lower surface of the flame-retardant sheet 41. When assembling multiple flame-retardant sheets 41 in a stacked configuration along the X-axis, the relative relationship between adjacent flame-retardant sheets 41 is configured such that the first large surface 411 of one flame-retardant sheet 41 faces the first large surface 411 of the adjacent flame-retardant sheet 41, or the second large surface 412 of one flame-retardant sheet 41 faces the second large surface 412 of the adjacent flame-retardant sheet 41. This stacking method ensures that the large surfaces on the same side of the flow-guiding units 42 with the same configuration on adjacent flame-retardant sheets 41 face each other. For example, Figure 9 and Figure 10As shown, when the flow guiding units 42 on two adjacent flame retardant sheets 41 are projected onto a plane perpendicular to the axial direction X, their projection positions are at least partially non-overlapping.

[0051] Please see Figure 6 , Figure 7 and Figure 8 In conjunction with the above embodiments, in some embodiments, the flow guiding unit 42 includes multiple flow channels 421. The first large surface 411 forms multiple protrusions facing away from the second large surface 412, and the flow channels 421 are formed by enclosing two adjacent protrusions. The second large surface 412 is recessed in the direction facing the first large surface 411 to form flow channels 421. The flow channels 421 on the first large surface 411 and the flow channels 421 on the second large surface 412 are misaligned. The air inlet 422 of the flow channel 421 is connected to the airflow cavity 413 of the flame retardant sheet 41, and the orientation of the air inlet 422 is inclined to the radial direction of the flame retardant sheet 41.

[0052] It is understandable that, such as Figure 8 As shown, multiple raised surface structures are provided on the first large surface 411 of the flame-retardant sheet 41. These raised surface structures are arranged circumferentially along the flame-retardant sheet 41. Two adjacent raised surface structures enclose each other to form the aforementioned flow-guiding unit 42, which is a flow channel 421. When the first disc body 21 is opened, airflow from inside the pipe or equipment enters the airflow chamber 413 of the flame-retardant sheet 41 through the vent hole 11. The airflow in the airflow chamber 413 can then flow out through the flow channel 421 on the flame-retardant sheet 41. Correspondingly, a recessed structure is formed on the second large surface 412 at the position corresponding to the raised surface structures on the first large surface 411. This recessed structure can also form a flow channel 421, which is the aforementioned flow-guiding unit 42, facilitating the passage of airflow. The depth of the flow channel 421 on the first large surface 411 is determined by the height of the raised surface structure on the first large surface 411, and the depth of the flow channel 421 on the second large surface 412 is determined by the depth of the recessed structure on the second large surface 412.

[0053] like Figure 8 As shown, for the same flame-retardant sheet 41, the flow channels 421 formed by the protrusion on the first large surface 411 and the flow channels 421 formed by the recess on the second large surface 412 are staggered in the axial direction X, rather than aligned vertically. Multiple flow channels 421 are provided on both the first and second large surfaces 411 and 412, and each flow channel 421 facilitates airflow, thereby improving the efficiency of airflow within the flame retardant and thus improving the flame extinguishing efficiency of the flame retardant. Figure 7As shown, each flow channel 421 is provided with an air inlet 422, which is connected to the airflow cavity 413 provided inside the flame retardant sheet 41, and the central axis Y of the air inlet 422 is set to be inclined to the radial direction of the flame retardant sheet 41.

[0054] Please see Figure 9 and Figure 10 In conjunction with the above embodiments, in some embodiments, in the axial direction X of the flame retardant sheet 41, the flow channel 421 on one of the flame retardant sheets 41 has an intersection position 423 with at least one flow channel 421 on the adjacent flame retardant sheet 41, and they are interconnected at the intersection position 423.

[0055] It is understandable that when the flow guiding unit 42 is configured as a flow channel 421, the flow channels 421 formed on the two large surfaces opposite each other on two adjacent flame-retardant sheets 41 are intersected. That is, the flow channel 421 on one of the flame-retardant sheets 41 and the corresponding flow channel 421 on the adjacent flame-retardant sheet 41 are intersected by their orthogonal projections on a plane perpendicular to the axial direction X. Figure 10 As shown, the two corresponding flow channels 421 are interconnected at the intersection 423. When airflow passes through the flow channel 421, the airflow enters the corresponding flow channel 421 through the air inlet 422. During the flow, they meet at the intersection 423 and then split. In fact, for two adjacent flame-retardant sheets 41, the flow channels 421 on the two large surfaces opposite to each other can be connected through the intersection 423, so that multiple flow channels 421 on the two adjacent flame-retardant sheets 41 can be connected to each other, or even all flow channels 421 can be connected. This depends on the density of the flow channels 421 and the degree of inclination relative to the radial direction when processing the flame-retardant sheet 41.

[0056] When any flow channel 421 on the flame-retardant sheet 41 intersects with multiple flow channels 421 on adjacent flame-retardant sheets 41 at a point 423, the flow space of the airflow along the flow path alternately increases and decreases, exhibiting a periodic change. For example, when airflow enters from the inlet 422 of a flow channel 421, it initially flows only in that flow channel 421. When the airflow reaches the point where the flow channel 421 intersects with another flow channel 421, the flow space of the airflow increases. If all the flow channels 421 on the flame-retardant sheets 41 are the same, the cross-sectional area of ​​the flow space of the airflow will become twice the original size. After the airflow passes through the intersection point 423, it will flow again in the flow channel 421, and the cross-sectional area of ​​the flow space of the airflow will return to its initial size until it flows through the next intersection point 423 and increases to twice the original size again. This cycle repeats, forming a periodic change, until the airflow is discharged from the flame retardant structure.

[0057] Because the intersection 423 has a larger space, the airflow will form turbulence or disturbance here. Airflows from different directions or different layers meet, causing collisions or mutual interference, which will further disrupt the stable structure of the flame airflow. This promotes full heat and momentum exchange between the high-temperature airflow and the surface of the flame-retardant sheet 41, as well as between airflow clusters of different temperatures, thereby more effectively reducing the airflow temperature and velocity and improving the flame extinguishing effect.

[0058] Among them, such as Figure 7 As shown, the orientation of the air inlet 422 of the flow channel 421, or the angle between the central axis Y of the air inlet 422 and the radial direction of the flame-retardant plate 41, is A, satisfying: 20°≤A≤40°. The angle A can be any value from 20°, 24°, 28°, 32°, 36°, and 40°, or a range between any two values. When the angle A between the orientation of the air inlet 422 of the flow channel 421 and the radial direction of the flame-retardant plate 41 is within the range of 20° to 40°, the length of the flow channel 421 is moderate, allowing sufficient flame extinguishing length without causing severe airflow deflection due to excessive length, thus affecting pressure relief efficiency. Meanwhile, when two adjacent flame-retardant sheets 41 are stacked, the flow channels 421 on the opposite large surfaces will form an intersecting arrangement. Under the condition of satisfying the above angle range, there are a certain number of intersection positions 423 between the flow channels 421. The number of intersection positions 423 is moderate, and the disturbance of the flame at the intersection positions 423 is increased, which increases the impact force with the inner wall of the flow channel 421, which can play a good flame extinguishing effect, and at the same time ensure the stability between adjacent flame-retardant sheets 41.

[0059] When the angle A between the orientation of the air inlet 422 of the flow channel 421 and the radial direction of the flame-retardant sheet 41 is less than 20°, the flow direction of the flow channel 421 is close to the radial direction of the flame-retardant sheet 41, which reduces the length of the flow channel 421 and thus the flame extinguishing distance of the structure. This may cause the flame to be discharged before it is completely extinguished in the flow channel 421, increasing the safety risk. Moreover, this arrangement may result in fewer intersection points 423, thus affecting the stability of the flame-retardant sheet 41. When the angle A between the orientation of the air inlet 422 of the flow channel 421 and the radial direction of the flame-retardant sheet 41 is greater than 40°, the orientation of the air inlet 422 of each flow channel 421 is more inclined relative to the radial direction of the flame-retardant sheet 41, resulting in an excessively long flow channel 421 and thus reducing the pressure relief efficiency.

[0060] Please see Figure 11 and Figure 12In conjunction with the above embodiments, in some embodiments, the flow channel 421 includes a first flow channel 424 and a second flow channel 425. The first flow channel 424 communicates with the airflow cavity 413, and the extension direction of the first flow channel 424 is inclined to the radial direction of the flame-retardant sheet 41. The second flow channel 425 communicates with the first flow channel 424, and the extension direction of the second flow channel 425 is at least partially inclined to the extension direction of the first flow channel 424. The extension direction of the second flow channel 425 may be the same as or inclined to the radial direction of the flame-retardant sheet 41.

[0061] It is understandable that the flow channel 421 can be composed of two flow channels with different extending directions, namely the first flow channel 424 and the second flow channel 425. The air inlet 422 is an opening at one end of the first flow channel 424, directly connected to the airflow chamber 413. The overall extending direction of the first flow channel 424 is inclined to the radial direction of the flame-retardant sheet 41. The second flow channel 425 is connected downstream of the first flow channel 424, and its extending direction forms a certain angle with the extending direction of the first flow channel 424. When the airflow enters the first flow channel 424 from the inside of the airflow chamber 413, because the first flow channel 424 is inclined to the radial direction of the flame-retardant sheet 41, the airflow will collide with the inner wall of the first flow channel 424, thereby changing the flow direction of the airflow. In this process, the energy of the airflow will be consumed, thereby achieving a certain flame extinguishing effect. When the airflow enters the second channel 425 from the first channel 424, it will also collide with the inner wall of the second channel 425. The second channel 425 will cause the airflow to change its flow direction again. In this process, the energy of the airflow will also be consumed, further improving the flame extinguishing effect.

[0062] Secondly, the flow state established by the airflow in the first flow channel 424 is disrupted when it enters the second flow channel 425, which has a different direction, easily causing eddies or flow separation at the turning point. The disturbance inside this channel, in conjunction with the misalignment and cross-connection of the corresponding flow channels 421 on the two adjacent flame-retardant sheets 41, makes the flow state of the airflow within the entire flame retardant complex and unstable, which can effectively disrupt the continuity of flame propagation and enhance heat exchange.

[0063] Please see Figure 12 , Figure 13 and Figure 14 In conjunction with the above embodiments, in some embodiments, the second flow channel 425 includes a plurality of sub-flow channels 426, which are sequentially connected, and the extending directions of two connected sub-flow channels 426 are inclined to each other. One of the sub-flow channels 426 is connected to the first flow channel 424 and is inclined to each other in the extending direction of the first flow channel 424.

[0064] Understandably, in the multiple sub-channels 426 of the second flow channel 425, the extension directions of two connected sub-channels 426 are inclined to each other. The sub-channel 426 directly connected to the first flow channel 424 also extends in an direction inclined to the same direction as the first flow channel 424. This arrangement allows for multiple deflections of the airflow direction within a limited space. After the airflow enters the second flow channel 425 from the first flow channel 424, its direction is changed each time it passes through the connection point between a sub-channel 426. This allows the actual flow path of the airflow to be appropriately extended as needed, increasing the contact frequency and total friction area between the airflow and the inner wall of the channel, thereby continuously consuming the energy of the airflow and improving the flame extinguishing effect.

[0065] Please see Figure 7 , Figure 11 and Figure 13 In conjunction with the above embodiments, in some embodiments, the extension direction of the flow channel 421 can be straight, V-shaped, wavy, or other shapes. Please refer to [link / reference]. Figure 16 , Figure 17 and Figure 18 The cross-sectional shape of the flow channel 421 can be circular, trapezoidal, triangular, or other shapes. When the flow channel 421 extends in a straight line, the channel structure is simple and easy to manufacture. The airflow moves stably along a fixed inclined direction, and energy is dissipated through friction on the inner wall and continuous inclined guidance. When the flow channel 421 extends in a V-shape, the channel undergoes a directional change midway, forcing the airflow to collide and change direction at the inflection point, increasing local impact dissipation within a finite length. When it extends in a wavy shape, the airflow undergoes multiple continuous directional changes, the flow path is lengthened, and vortices and strong turbulence are formed at each directional change point, thereby maximizing the disruption of flow stability and enhancing heat exchange at the microscopic scale.

[0066] Different cross-sectional shapes of the flow channel 421 can be matched with different extension shapes of the flow channel 421. The arc-shaped cross-section gives the flow channel 421 the smoothest inner wall surface, which helps to reduce unnecessary local resistance and allows the airflow to flow more smoothly in the preset direction. The trapezoidal cross-section combines a plane and an inclined plane, which can guide the airflow to concentrate or diffuse in a specific area to a certain extent and increase the contact area of ​​the inner wall surface. Moreover, when the cross-section of the flow channel 421 is set as a trapezoidal cross-section, the multiple flame-retardant sheets 41 are in surface contact when stacked in opposite directions. The contact area between two adjacent flame-retardant sheets 41 is increased, which can improve the stability of the flame retardant assembly 40. The triangular cross-section has sharper inner angles and more significant changes in the inclination angle of the inner wall surface, which can easily induce stronger flow separation and eddies at the corners to enhance the intensity of local turbulence and energy dissipation.

[0067] Please see Figure 19 , Figure 20 and Figure 21 In conjunction with the above embodiments, in some embodiments, the flame retardant assembly 40 further includes at least one first plate 43. On the axial X direction of the flame retardant sheet 41, the first plate 43 is disposed between two adjacent flame retardant sheets 41 and is connected to the two adjacent flame retardant sheets 41 respectively.

[0068] It is understood that the multiple flame-retardant sheets 41 in the flame retardant assembly 40 are arranged in the axial direction X, and a first plate 43 can be set between two adjacent flame-retardant sheets 41. Simultaneously, the flame-retardant sheet 41 is also essentially set between two first plates 43, and both the first plate 43 and the flame-retardant sheet 41 are annular. The upper and lower surfaces of the first plate 43 are smooth planes, and corresponding through holes are provided on the first plate 43 to facilitate the connection of the first plate 43 and the flame-retardant sheet 41 using a screw threaded through the corresponding through holes. The first plate 43 can also be composed of multiple arc-shaped segments, each segment having stepped, serrated, or wavy connecting structures at both ends. Multiple segments are connected through these connecting structures to form an annular first plate 43.

[0069] Since each flame-retardant sheet 41 is separated from its adjacent counterpart by a first flat plate 43, and the first flat plate 43 itself does not have a channel for airflow, the only path for airflow in the flame-retardant sheet 41 is the small-section flow channel 421 on the flame-retardant sheet 41. There is no merging of airflow in the flow channel 421 of the flame-retardant sheet 41 with that of the adjacent flame-retardant sheet 41. Therefore, this structure avoids a sudden increase in flow capacity due to a large cavity between the flame-retardant sheet 41 and the first flat plate 43. The small and constant flow capacity means that the airflow is always confined within the narrow flow channel 421 on the flame-retardant sheet 41, resulting in a relatively high flow velocity and more intense and continuous friction with the inner wall of the channel, thus consuming more of the flame's energy.

[0070] Please see Figure 22 , Figure 24 and Figure 25 In conjunction with the above embodiments, in some embodiments, the flow guiding unit 42 is configured as a boss 427 protruding from the first large surface 411 and the second large surface 412. The boss 427 on the first large surface 411 and the boss 427 on the second large surface 412 are misaligned. The boss 427 is used to block the airflow in the flame retardant sheet 41 so that at least part of the flow path of the airflow is inclined to the radial direction of the flame retardant sheet 41.

[0071] It is understandable that the flow guiding unit 42 can also be a boss 427. Multiple bosses 427 can be formed on the first large surface 411 of the flame-retardant sheet 41, and multiple bosses 427 can also be formed on the second large surface 412. When multiple flame-retardant sheets 41 are stacked, the bosses 427 on the two opposing first large surfaces 411 of adjacent flame-retardant sheets 41 are staggered, or the bosses 427 on the two opposing second large surfaces 412 are staggered. That is, the bosses 427 on the two opposing large surfaces of adjacent flame-retardant sheets 41 are not opposite each other in the axial direction X, but are at the same horizontal position. Adjacent flame-retardant sheets 41 are supported by multiple bosses 427 on their respective surfaces, creating space for airflow between them. When airflow flows within this space, it is blocked by the multiple bosses 427, thus changing its direction.

[0072] Specifically, when the airflow flows radially or nearly radially within the flame-retardant sheet 41, it directly impacts the protrusion 427. This direct collision instantly consumes the airflow's energy, thereby enhancing the flame extinguishing effect. Furthermore, as the airflow meanders around the edge of the protrusion 427 and between the staggered protrusions 427, it easily generates complex turbulent phenomena such as eddies, separation, and reattachment. This intense turbulence not only further consumes kinetic energy but also enhances the heat exchange efficiency between the high-temperature airflow and the protrusion 427 and the flame-retardant sheet 41 itself, accelerating cooling and further improving the flame extinguishing effect.

[0073] Please see Figure 26 and Figure 27 In conjunction with the above embodiments, in some embodiments, the flame retardant assembly 40 further includes at least one second plate 44, which is disposed between two adjacent flame retardant sheets 41 in the axial direction X of the flame retardant sheet 41 and is connected to the two adjacent flame retardant sheets 41 respectively.

[0074] It is understandable that, for the structure of the flame-retardant sheet 41 with protrusions 427, a second flat plate 44 can be set between two adjacent flame-retardant sheets 41. Simultaneously, the flame-retardant sheet 41 is also equivalent to being set between two second flat plates 44. The second flat plate 44 can have the same structure as the first flat plate 43, or it can be different. The second flat plate 44 can also be composed of multiple arc-shaped segments, each segment having stepped, serrated, or wavy connecting structures at both ends. Multiple segments are connected through these connecting structures to form a ring-shaped second flat plate 44.

[0075] Since each flame-retardant sheet 41 is separated from its adjacent counterpart by a second plate 44, and the second plate 44 itself does not have a channel for airflow, the only path for airflow within the flame-retardant sheet 41 is the small cross-sectional flow space on the flame-retardant sheet 41. This prevents the airflow in the flow space of the flame-retardant sheet 41 from merging with the airflow in the flow space of adjacent flame-retardant sheets 41. Therefore, this structure avoids a sudden increase in flow capacity due to the presence of a large space between the flame-retardant sheet 41 and the second plate 44. The small and constant flow capacity means that the airflow is always confined within the narrow space of the flame-retardant sheet 41, resulting in a relatively high flow velocity and more intense friction with the boss 427, thus consuming more of the flame's energy.

[0076] Please see Figure 15 and Figure 23 In conjunction with the above embodiments, in some embodiments, the flame-retardant sheet 41 includes multiple arc-shaped segments 414, which are sequentially connected to form an annular flame-retardant sheet 41. Each arc-shaped segment 414 is provided with a flow-guiding unit 42. Each arc-shaped segment 414 has a splicing portion 415 at both ends, and the splicing portions 415 on two adjacent arc-shaped segments 414 are connected along the circumference of the flame-retardant sheet 41. The splicing portion 415 can be stepped, serrated, or other shapes.

[0077] Understandably, to improve the utilization rate of the flame-retardant sheet 41 material, the flame-retardant sheet 41 can be configured as a single ring structure, or as a ring structure composed of multiple arc-shaped segments 414. The number of arc-shaped segments 414 can be 2, 3, 4, 6, 8, etc. A splicing portion 415 can be provided at both ends of the arc-shaped segment 414. The specific configuration of the splicing portion 415 can be stepped, serrated, etc. This configuration allows adjacent arc-shaped segments 414 to cooperate to form stepped, serrated, or other zigzag-shaped gaps, rather than straight, continuous gaps. Even if some flame enters the gap, it will be extinguished as it flows within the gap, without affecting the flame extinguishing performance. The width of this gap is generally around 1 mm.

[0078] Compared to directly machining the flame-retardant sheet 41 into a complete ring, the split structure allows each arc segment 414 to be smaller and simpler, reducing the requirements for large precision molds and processing equipment, simplifying casting, stamping, or machining processes, and improving production efficiency and yield. Each arc segment 414 has corresponding holes. During installation, screws are inserted through these holes to fix the arc segment 414 in its corresponding position, allowing multiple arc segments 414 to be combined into a ring structure. If a portion of the annular flame-retardant sheet 41 becomes damaged or clogged after long-term use, only that arc segment 414 in that area can be replaced or repaired, without discarding or disposing of the entire flame-retardant sheet 41. This reduces maintenance costs and material waste, and facilitates repair and replacement.

[0079] Please see Figure 30 This application also provides a pressure relief method for an explosion-proof valve, applied to the explosion-proof valve described above, the method comprising: S1: Install the valve seat 10 of the explosion-proof valve onto the pipeline or equipment. The elastic part 31 of the explosion-proof valve applies a pre-tightening force to the second disc part 22, so that the first disc part 21 covers the vent hole 11 on the valve seat 10 and maintains a sealed connection with the valve seat 10. S2: When an explosion occurs in the pipeline or equipment, causing the internal pressure to exceed the set value, the explosion gas flow pushes the first disc body 21 to overcome the pre-tightening force of the elastic part 31, causing the first disc body 21 to separate from the valve seat 10, the vent hole 11 is opened, and the explosion gas flow is released outward through the vent hole 11. S3: When the pressure in the pipeline or equipment drops below the set value, the elastic part 31 pushes the valve disc assembly 20 to reset, so that the first disc body 21 is re-sealed with the valve seat 10 and the vent hole 11 is closed.

[0080] Understandably, during the initial installation phase, the valve seat 10 is fixed to the pipe or equipment using bolts or clips. Under the pre-tightening force provided by the elastic part 31 (such as a spring), this force is transmitted to the first disc part 21 through the second disc part 22 and the connecting part 23, causing the flange 212 on the first disc part 21 to tightly press against the sealing part 13 of the valve seat 10, thereby reliably sealing the vent hole 11 and ensuring the sealing performance of the pipe or equipment during normal operation. When an explosion occurs inside the pipe or equipment, the internal pressure increases sharply, and the high-temperature, high-pressure gas flow generated by the explosion acts on the lower surface of the first disc part 21. When the compressive force of the gas flow is sufficient to overcome the preset pre-tightening force of the elastic part 31, the valve disc assembly 20 moves as a whole, the first disc part 21 disengages from the valve seat 10, and the vent hole 11 opens. The explosive gas flow is then discharged through the hole and immediately enters the flame retardant assembly 40 surrounding it. As the gas flow passes through the narrow, tortuous channel formed by multiple layers of flame retardant sheets 41, its kinetic energy is consumed, its temperature drops sharply, and the flame is effectively quenched, ultimately achieving flameless venting and improving the safety of the structure. As the internal pressure of the pipeline or equipment rapidly drops below the safe value through venting, the compressed elastic part 31 releases its stored elastic potential energy, pushing the second disc part 22 and driving the first disc part 21 downward via the connecting part 23, causing the flange 212 to re-press the sealing part 13, and the venting hole 11 to be closed. A guide structure, such as a guide rod, can also be provided. The guide rod can pass through the first disc part 21 and be slidably connected to it. The upper end of the guide rod is connected to the valve cover part 32, and the lower end is connected to the valve seat 10. It can guide the movement direction of the first disc part 21, so that when the first disc part 21 is reset, the flange 212 can accurately align with the sealing part 13 and compress it to seal. Because the first disc portion 21 and the second disc portion 22 are spaced apart, the influence of high temperature on the elastic portion 31 is effectively isolated, keeping its performance stable. This ensures the accuracy and reliability of the reset action, allowing the explosion-proof valve to immediately return to its initial sealing state after pressure relief without manual intervention, thus ensuring the safe continuous operation of pipelines or equipment.

[0081] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0082] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0083] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0084] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An explosion-proof valve, characterized in that, include: Valve seat (10) has a vent (11); A valve disc assembly (20) is disposed on one side of the valve seat (10). The valve disc assembly (20) includes a first disc body (21), a second disc body (22), and a connecting part (23). The first disc body (21) covers the opening of the vent hole (11) and is connected to the valve seat (10). The second disc body (22) is disposed at a distance from the first disc body (21) on the side away from the valve seat (10). The second disc body (22) is connected to the first disc body (21) through the connecting part (23). The support assembly (30) is disposed on the same side of the valve seat (10) as the valve disc assembly (20). The support assembly (30) includes an elastic part (31) that abuts against the side of the second disc body part (22) away from the first disc body part (21).

2. The explosion-proof valve according to claim 1, characterized in that, The support component (30) also includes: The valve cover (32) is disposed on the side of the elastic part (31) opposite to the second disc body part (22) and is connected to the elastic part (31); The limiting part (33) is connected to the side of the valve cover part (32) facing the second disc part (22) and is spaced apart from the second disc part (22).

3. The explosion-proof valve according to claim 1, characterized in that, The valve seat (10) includes a base plate (12) and a sealing part (13). The vent hole (11) is disposed through the base plate (12). The base plate (12) has a sealing groove (121) on the side facing the first disc body (21). The sealing part (13) is disposed in the sealing groove (121) and connected to the base plate (12). The first disc body (21) includes a plate (211) and a flange (212). The flange (212) is located on the side of the plate (211) facing the sealing part (13) and is arranged along the circumference of the plate (211). The plate (211) is sealed to the sealing part (13) through the flange (212).

4. The explosion-proof valve according to claim 1, characterized in that, The number of elastic parts (31) is multiple, and the multiple elastic parts (31) are arranged at intervals along the circumference of the second disk body part (22).

5. The explosion-proof valve according to claim 1, characterized in that, The explosion-proof valve also includes: A flame retardant assembly (40) is disposed around the valve disc assembly (20) and connected to the valve seat (10). The flame retardant assembly (40) includes a plurality of flame retardant sheets (41) stacked along the axial direction (X). At least one side of the flame retardant sheet (41) is provided with a plurality of flow guiding units (42). The plurality of flow guiding units (42) are arranged at intervals along the circumference of the flame retardant sheet (41). Each of the flow guiding units (42) is configured such that when the airflow pushes open the first disc body portion (21) and flows into the flame retardant sheet (41), the flow guiding unit (42) changes the flow direction of the airflow located in the flame retardant sheet (41) so that at least a portion of the flow path of the airflow is inclined to the radial direction of the flame retardant sheet (41).

6. The explosion-proof valve according to claim 5, characterized in that, The flame retardant sheet (41) has a first large surface (411) and a second large surface (412) arranged opposite to each other. The flow guiding unit (42) is provided on the first large surface (411) and the second large surface (412). The first large surface (411) on two adjacent flame retardant sheets (41) are arranged facing each other, or the second large surface (412) on two adjacent flame retardant sheets (41) are arranged facing each other. The orthographic projections of the flow guiding units (42) on two adjacent flame retardant sheets (41) on a plane perpendicular to the axis (X) do not at least partially overlap.

7. The explosion-proof valve according to claim 6, characterized in that, The flow guiding unit (42) includes multiple flow channels (421). The first large surface (411) forms multiple protrusions on the side away from the second large surface (412). The flow channels (421) are formed by enclosing two adjacent protrusions. The flow channels (421) are formed by recessing the second large surface (412) towards the first large surface (411). The flow channels (421) on the first large surface (411) and the flow channels (421) on the second large surface (412) are misaligned. The air inlet (422) of the flow channel (421) is connected to the airflow cavity (413) of the flame retardant sheet (41), and the orientation of the air inlet (422) is inclined to the radial direction of the flame retardant sheet (41).

8. The explosion-proof valve according to claim 7, characterized in that, In the axial (X) direction of the flame retardant sheet (41), one of the flow channels (421) on one of the flame retardant sheets (41) has an intersection position (423) with at least one of the flow channels (421) on the adjacent flame retardant sheet (41) and is interconnected at the intersection position (423); When any one of the flow channels (421) on the flame retardant sheet (41) has an intersection position (423) with multiple flow channels (421) on adjacent flame retardant sheets (41), the flow space of the airflow on the flow path alternately increases and decreases.

9. The explosion-proof valve according to claim 7 or 8, characterized in that, The flow channel (421) includes: The first flow channel (424) is connected to the airflow cavity (413), and the extension direction of the first flow channel (424) is inclined to the radial direction of the flame retardant sheet (41); The second flow channel (425) is connected to the first flow channel (424), and the extension direction of the second flow channel (425) is at least partially inclined to the extension direction of the first flow channel (424).

10. The explosion-proof valve according to claim 9, characterized in that, The second flow channel (425) includes a plurality of sub-flow channels (426), which are connected in sequence, and the extension directions of two connected sub-flow channels (426) are inclined to each other; One of the sub-channels (426) is connected to the first channel (424) and is inclined relative to the extension direction of the first channel (424).

11. The explosion-proof valve according to claim 7, characterized in that, The angle between the orientation of the air inlet (422) of the flow channel (421) and the radial direction of the flame retardant sheet (41) is A, which satisfies: 20°≤A≤40°.

12. The explosion-proof valve according to claim 7, characterized in that, The extension direction of the flow channel (421) can be straight, V-shaped, or wavy, and the cross-sectional shape of the flow channel (421) can be arc-shaped, trapezoidal, or triangular.

13. The explosion-proof valve according to claim 7, characterized in that, The flame retardant assembly (40) also includes: At least one first plate (43) is disposed on the axial (X) axis of the flame retardant sheet (41) between two adjacent flame retardant sheets (41) and connected to the two adjacent flame retardant sheets (41) respectively.

14. The explosion-proof valve according to claim 6, characterized in that, The flow guiding unit (42) is configured as a protrusion (427) formed on the first large surface (411) and the second large surface (412). The protrusion (427) on the first large surface (411) and the protrusion (427) on the second large surface (412) are misaligned. The protrusion (427) is used to block the airflow in the flame retardant sheet (41) so that at least part of the flow path of the airflow is inclined to the radial direction of the flame retardant sheet (41).

15. The explosion-proof valve according to claim 14, characterized in that, On two adjacent flame-retardant sheets (41), the protrusions (427) on the two opposing first large surfaces (411) are staggered, or the protrusions (427) on the two opposing second large surfaces (412) are staggered.

16. The explosion-proof valve according to claim 14, characterized in that, The flame retardant assembly (40) also includes: At least one second plate (44) is disposed on the axial (X) side of the flame retardant sheet (41) between two adjacent flame retardant sheets (41) and connected to the two adjacent flame retardant sheets (41) respectively.

17. The explosion-proof valve according to claim 5, characterized in that, The flame retardant sheet (41) includes multiple arc segments (414), and the multiple arc segments (414) are connected in sequence to form an annular flame retardant sheet (41). Each arc segment (414) is provided with a flow guiding unit (42). Each of the arc segments (414) has a splicing part (415) at both ends. Along the circumference of the flame retardant sheet (41), the splicing parts (415) on two adjacent arc segments (414) are connected together.

18. The explosion-proof valve according to claim 17, characterized in that, The splicing part (415) can be stepped or sawtooth-shaped.

19. The explosion-proof valve according to claim 5, characterized in that, The explosion-proof valve also includes an inner support ring (50) and an outer support ring (60). The inner support ring (50) and the outer support ring (60) are respectively connected to the valve seat (10). The inner support ring (50) and the outer support ring (60) are provided with a plurality of exhaust channels (61). The inner support ring (50) is spaced apart inside the outer support ring (60) and forms an installation space (62) with the outer support ring (60). The flame retardant assembly (40) is disposed in the installation space (62).

20. The explosion-proof valve according to claim 19, characterized in that, The explosion-proof valve also includes a fixing ring (70), on which a plurality of exhaust channels (61) are provided. The fixing ring (70) is spaced apart on the inner side of the inner support ring (50), and also encloses the installation space (62) between the fixing ring (70) and the inner support ring (50) for installing the flame retardant assembly (40). The number of fixing rings (70) is multiple, the radii of the multiple fixing rings (70) are different, and they share the same axis (Z). The installation space (62) is formed between two adjacent fixing rings (70) for installing the flame retardant assembly (40).

21. A method for relieving pressure on an explosion-proof valve, characterized in that, Applied to the explosion-proof valve as described in any one of claims 1 to 20, the method comprises: Install the valve seat (10) of the explosion-proof valve onto a pipeline or equipment. The elastic part (31) of the explosion-proof valve applies a pre-tightening force to the second disc part (22), so that the first disc part (21) covers the vent hole (11) on the valve seat (10) and maintains a sealed connection with the valve seat (10). When an explosion occurs in the pipeline or equipment, causing the internal pressure to exceed the set value, the explosion gas flow pushes the first disc part (21) to overcome the pre-tightening force of the elastic part (31), causing the first disc part (21) to separate from the valve seat (10), the vent hole (11) is opened, and the explosion gas flow is released outward through the vent hole (11); When the pressure in the pipeline or equipment drops below the set value, the elastic part (31) pushes the valve disc assembly (20) to reset, so that the first disc body part (21) is re-sealed with the valve seat (10) and the vent hole (11) is closed.

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