pressure relief device

Abstract

This invention discloses a pressure relief device, comprising: a base, a valve cover, a heat insulation sleeve, and a sealing mechanism. The base includes a hollow support section having a first end and a second end opposite to each other. The valve cover is sealed at the first end of the base and includes an upper valve plate and a lower base plate spaced apart by a certain distance, and a middle end plate surrounding the two. A cooling chamber is formed between the upper valve plate, the middle end plate, and the lower base plate. At least two guide tubes are provided on the valve cover, and the guide tubes are connected to the cooling chamber, allowing fluid to flow through one guide tube into the cooling chamber and then out through the other. The sealing mechanism is disposed between the middle end plate of the valve cover and the first end of the base, and the valve cover and the base cooperate to form a sealed working chamber. The heat insulation sleeve is disposed in the working chamber and can at least insulate the base and the valve cover. The pressure relief device provided by this application not only has high temperature resistance and a long service life, but also features an automatically resetting valve plate, resulting in high reliability.

Description

Technical Field

[0001] This invention relates to the field of valve device technology, and in particular to a pressure relief device. Background Technology

[0002] During the converter steelmaking process, air and coal gas interact and change, and a mixture of CO and O2 gas will appear in the flue gas. When the flue gas temperature is below 610℃, there is a risk of instantaneous overpressure due to explosion.

[0003] The existing converter flue gas treatment system works as follows: the converter flue gas is cooled to approximately 800°C through a vaporization flue, then enters the flue gas purification system. It undergoes primary dust removal and cooling to below 200°C in an evaporative cooler or water scrubbing tower before entering the fine dust removal system. Once the flue gas meets emission requirements, it is discharged into the atmosphere, while the converter gas with a certain concentration of CO is recycled into a gas holder. Multiple explosion relief valves are installed in the flue gas fine dust removal system (such as an electrostatic precipitator) at around 200°C to mitigate the risk of instantaneous overpressure from minor gas explosions.

[0004] Currently, existing technology provides a commonly used pressure relief device structure suitable for flue gas conditions around 200℃. This structure mainly relies on the weight of the valve plate itself to seal the high-temperature flue gas. When the high-temperature flue gas explodes in the sealed environment, the internal pressure rises sharply, and the valve plate of the explosion relief device is pushed open by the high-temperature flue gas, allowing the high-temperature flue gas to be released from the explosion relief port. However, the aforementioned pressure relief device is only suitable for flue gas environments around 200℃, and not for high-temperature flue gas environments of 800℃ to 1000℃.

[0005] Furthermore, existing technologies also provide another type of high-temperature explosion relief valve. When this high-temperature valve plate is opened by more than 70-90 degrees, it cannot return to its original position, potentially leading to the following serious consequences: If the valve plate cannot automatically return to its original position, the process flue gas will no longer be in a closed environment, making normal converter steelmaking production impossible and causing a shutdown. In addition, if the valve plate cannot return to its original position, the surrounding environment will be exposed to high-temperature flue gas for an extended period, compromising production safety.

[0006] Therefore, it is necessary to propose a pressure relief device that can at least solve the above-mentioned technical problems. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the present invention provides a pressure relief device that is not only resistant to high temperature and has a long service life, but also has an automatic valve plate reset and high reliability.

[0008] The specific technical solution of the embodiments of the present invention is as follows:

[0009] A pressure relief device includes: a base, a valve cover, a heat insulation sleeve, and a sealing mechanism.

[0010] The base includes: a hollow support section having opposing first and second ends;

[0011] The valve cover is sealed at the first end of the base. The valve cover includes an upper valve plate and a lower base plate arranged at a certain distance from each other, and a middle end plate surrounding the upper valve plate and the lower base plate. A cooling cavity is formed between the upper valve plate, the middle end plate, and the lower base plate. At least two hollow guide tubes are provided on the valve cover. The guide tubes are connected to the cooling cavity. Fluid can flow through the cooling cavity through one guide tube and then out through the other guide tube, forming a first cooling path. The sealing mechanism is provided between the middle end plate of the valve cover and the first end of the base. The valve cover and the base cooperate to form a sealed working cavity. The heat insulation sleeve is provided in the working cavity and can at least be used to insulate the base and the valve cover.

[0012] In a preferred embodiment, the sealing mechanism includes: a first sealing component, a second sealing component, and a third sealing component. The first sealing component is a bevel seal formed between the middle end plate and the first end of the base. The second sealing component is disposed around the first sealing component and includes at least one first annular groove disposed on at least one of the middle end plate and the first end of the base, and a sealant filled in the first annular groove. The third sealing component is disposed around the second sealing component and includes a second annular groove disposed on at least one of the middle end plate and the first end of the base, wherein at least the second annular groove is filled with positive pressure gas.

[0013] In a preferred embodiment, the first end of the support section is provided with a flange structure, the end face of the flange structure is provided with the first annular groove, the middle end plate is provided with an annular protrusion opposite to the first annular groove, and the seal is pressed into the first annular groove by the annular protrusion.

[0014] In a preferred embodiment, a flange structure is provided at the first end of the support section, the positive pressure gas is an inert gas, the positive pressure gas is distributed in the second annular groove and in the gap between the end face of the flange structure and the middle end plate, and the flange structure of the support section is also provided with a vent hole communicating with the second annular groove.

[0015] In a preferred embodiment, the heat-insulating sleeve is any one of the following: a sleeve or annular coil with a refractory castable coating on its surface.

[0016] In a preferred embodiment, the heat insulation sleeve is an annular coil filled with coolant.

[0017] In a preferred embodiment, the lower valve plate is further surrounded by an inverted pyramidal cavity on the side opposite to the upper valve plate, and the pyramidal cavity is filled with heat-insulating material.

[0018] In a preferred embodiment, the first end of the support section is provided with a flange structure, the edge of the flange structure is provided with multiple brackets, the brackets are pressed onto the upper valve plate, a guide support rod is provided through the bracket, one end of the guide support rod is inserted into the flange structure, and the other end is fitted with a bracket.

[0019] In a preferred embodiment, the bracket is provided with a first mounting hole, and a first elastic limiting device is installed in the first mounting hole, with one end of the first elastic limiting device pressed against the bracket.

[0020] In a preferred embodiment, the bracket is further provided with a second mounting hole, in which a second elastic limiting device is installed, one end of which is spaced at a predetermined distance from the upper valve plate.

[0021] In a preferred embodiment, the first end of the support section is provided with a flange structure, and the flange structure has an opening for the guide tube to pass through.

[0022] In a preferred embodiment, the guide tube is located at the lower end of the flange structure near the support section, and the lower end is provided with a limiting part, the outer dimensions of which are larger than the cross-sectional dimensions of the opening.

[0023] The technical solution of the present invention has the following significant beneficial effects:

[0024] The pressure relief device provided in this application includes a valve cover comprising an upper valve plate and a lower base plate spaced apart from each other at a certain distance, and a middle end plate surrounding the upper valve plate and the lower base plate. A cooling chamber is formed between the upper valve plate, the middle end plate, and the lower base plate. The valve cover is provided with at least two hollow guide tubes, which are connected to the cooling chamber. Fluid can flow through one guide tube into the cooling chamber and then out through the other guide tube, forming a first cooling path to cool the valve cover. This ensures that the valve cover can be cooled by the fluid at high temperatures, preventing deformation of the valve cover from affecting normal use.

[0025] Furthermore, the flange structure of the supporting section has an opening for the guide tube to pass through. When one end of the guide tube is connected to the valve cover and the other end passes through the flange structure, the trajectory of the valve cover is controllable when it pops up and falls back, that is, the valve cover can be limited when it falls back, so that the valve cover moves along the extension direction of the guide tube when it falls back, thereby accurately resetting.

[0026] The embodiments provided in this application include an annular inclined surface seal, an annular rubber seal, and an annular positive pressure gas jet seal between the valve cover and the base. The multiple seals improve the sealing effect. The annular positive pressure gas seal has both a sealing function and a purging function, blowing away the accumulated dust on the sealing surface and preventing the dust from reigniting and damaging the sealing surface. The gas seal is not affected by temperature and also has a certain cooling effect on the sealing surface, which can extend the valve's life and ensure its performance even after the valve has been opened and closed multiple times.

[0027] In addition, in order to effectively limit the valve cover, a first elastic limiting device and a second elastic limiting device are installed on the bracket for graded limiting, ensuring that the valve cover can reliably fall back under different pressures.

[0028] Specific embodiments of the invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the invention are not therefore limited in scope. Within the spirit and scope of the appended claims, embodiments of the invention include many changes, modifications, and equivalents. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0029] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0030] Figure 1 This is a schematic diagram of a pressure relief device provided in the embodiments of this application.

[0031] Instruction manual drawing reference numerals:

[0032] 1. Support short sections;

[0033] 2. Heat-insulating sheath;

[0034] 3. Middle end plate;

[0035] 4. First annular groove;

[0036] 5. Sealing components;

[0037] 6. Guide support rod;

[0038] 7. First elastic limiting device;

[0039] 8. Bracket;

[0040] 9. Second elastic limiting device;

[0041] 10. Air vent;

[0042] 11. Guide tube;

[0043] 12. Upper valve plate;

[0044] 13. Lower bottom plate;

[0045] 14. Pyramidal cavity;

[0046] 15. Flange structure;

[0047] 16. Bracket. Detailed Implementation

[0048] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art fall within the scope defined by the appended claims.

[0049] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0051] This application provides a pressure relief device suitable for working environments in the high-temperature section of converter flue gas (flue gas temperature between 800 degrees Celsius and 1000 degrees Celsius).

[0052] Please see Figure 1 This application specification provides a pressure relief device, which may include: a base, a valve cover, a heat insulation sleeve 2, and a sealing mechanism. The base includes a hollow support section 1, which has a first end and a second end opposite to each other. The valve cover is sealed at the first end of the base and includes an upper valve plate 12 and a lower base plate 13 spaced apart and opposite to each other, as well as a middle end plate 3 surrounding the upper valve plate 12 and the lower base plate 13. A cooling chamber is formed between the end plate 3 and the lower base plate 13. At least two hollow guide tubes 11 are provided on the valve cover. The guide tubes 11 are connected to the cooling chamber. Fluid can flow through the cooling chamber through one guide tube 11 and then out through the other guide tube 11 to form a first cooling path. The sealing mechanism is provided between the middle end plate 3 of the valve cover and the first end of the base. The valve cover and the base cooperate to form a sealed working chamber. The heat insulation sleeve 2 is provided in the working chamber and can at least be used to insulate the base and the valve cover.

[0053] In this embodiment, the pressure relief device mainly includes a base, a valve cover, a heat insulation sleeve 2, and a sealing mechanism.

[0054] The base includes a hollow support section 1. The support section 1 is a hollow cylindrical shape, having a first end and a second end opposite to each other. The first end is located at the top (upper end), and the second end is located below the first end (lower end). A flange structure 15 may be provided at the first end for sealing cooperation with the valve cover.

[0055] The valve cover is sealed at the first end of the base. The valve cover includes an upper valve plate 12 and a lower base plate 13 arranged opposite each other at a certain distance, and a middle end plate 3 surrounding the upper valve plate 12 and the lower base plate 13. A cooling cavity is formed between the upper valve plate 12, the middle end plate 3, and the lower base plate 13.

[0056] The valve cover is provided with at least two hollow guide tubes 11, which are connected to the cooling chamber. Fluid can flow through one of the guide tubes 11 into the cooling chamber and then out through the other guide tube 11 to form a first cooling path, thereby cooling the valve cover. This allows the fluid to carry away the heat from the valve cover at high temperatures, ensuring that deformation of the valve cover does not affect normal use.

[0057] Specifically, there can be multiple guide tubes 11, which can be evenly distributed around the valve cover.

[0058] Furthermore, the flange structure 15 of the supporting section 1 has an opening for the guide tube 11 to pass through. When one end of the guide tube 11 is connected to the valve cover and the other end passes through the flange structure 15, the trajectory of the valve cover during its pop-up and fall-down is controllable. That is, the valve cover can be limited when it falls back, so that the valve cover moves along the extension direction of the guide tube 11 when it falls back, thereby accurately resetting.

[0059] Furthermore, the guide tube 11 is located at the lower end of the flange structure 15 near the support section 1, and the lower end of the guide tube 11 is provided with a limiting part, the outer dimensions of which are larger than the cross-sectional dimensions of the opening.

[0060] Because the lower end of the guide tube 11 is located below the flange structure 15, and the lower end of the guide tube 11 is provided with a limiting part, during pressure relief, when the valve cover moves upward, after moving a certain distance, since the outer dimensions of the limiting part are larger than the cross-sectional dimensions of the opening, the limiting part of the guide tube 11 will be stuck on the lower surface of the flange structure 15, thus preventing the valve cover from moving further upward. This also limits the displacement of the valve cover, preventing it from being pushed to a position that cannot be reset during pressure relief.

[0061] The sealing mechanism is located between the middle end plate 3 of the valve cover and the first end of the base to ensure the sealing between the valve cover and the base.

[0062] Specifically, the sealing mechanism may include: a first sealing component, a second sealing component, and a third sealing component. The first sealing component is a bevel seal formed between the middle end plate 3 and the first end of the base. The second sealing component is disposed around the first sealing component and includes at least one first annular groove 4 disposed on at least one of the middle end plate 3 and the first end of the base, and a sealing element 5 filled in the first annular groove 4. The third sealing component is disposed around the second sealing component and includes a second annular groove disposed on at least one of the middle end plate 3 and the first end of the base, and at least the second annular groove is filled with positive pressure gas.

[0063] The first end of the supporting section 1 is provided with a flange structure 15, and the end face of the flange structure 15 is provided with the first annular groove 4. The middle end plate 3 is provided with an annular protrusion opposite to the first annular groove 4, and the sealing element 5 is pressed into the first annular groove 4 by the annular protrusion. The sealing element 5 can be in the form of a rubber sealing ring, but it can also be in other forms, which are not specifically limited in this application.

[0064] The first end of the support section 1 is provided with a flange structure 15. The positive pressure gas is an inert gas (such as nitrogen). The positive pressure gas is distributed in the second annular groove and in the gap between the end face of the flange structure 15 and the middle end plate 3. The flange structure 15 of the support section 1 is also provided with a vent hole 10 that communicates with the second annular groove.

[0065] Overall, the embodiments provided in this application provide an annular bevel seal, an annular rubber seal, and an annular positive pressure gas jet seal between the valve cover and the base. The multiple seals improve the sealing effect. The annular positive pressure gas seal has both a sealing function and a purging function, blowing away the accumulated dust on the sealing surface and preventing the dust from reigniting and damaging the sealing surface. The gas seal is not affected by temperature and also has a certain cooling effect on the sealing surface, which can extend the valve life and ensure its performance even after the valve has been opened and closed multiple times.

[0066] In this embodiment, the valve cover and the base cooperate to form a sealed working chamber; the heat insulation sleeve 2 is disposed in the working chamber and can at least insulate the base and the valve cover. By setting the heat insulation sleeve, internal heat transfer is prevented, the valve seat is protected from overheating, deformation of the valve seat is reduced, and the service life of the valve seat is guaranteed.

[0067] Specifically, the heat insulation sleeve 2 can be any one of the following: a sleeve or annular coil with a refractory castable coating on its surface. Furthermore, when the heat insulation sleeve 2 is an annular coil, the annular coil is filled with coolant, and the fluid continuously cools the valve seat, more reliably ensuring that the valve seat does not overheat and is less prone to deformation.

[0068] In one embodiment, the lower valve plate, on the side opposite to the upper valve plate 12, is further surrounded by an inverted pyramidal cavity 14, which is filled with a heat-insulating material. This heat-insulating material can insulate the main structure of the valve cover (upper valve plate 12, lower bottom plate 13, and middle end plate 3), ensuring that it does not overheat and is not easily deformed.

[0069] In one embodiment, a flange structure 15 is provided at the first end of the support section 1, and a plurality of brackets 16 are provided on the edge of the flange structure 15. The brackets 16 are pressed onto the upper valve plate 12, and a guide support rod 6 is passed through the bracket 16. One end of the guide support rod 6 passes through the flange structure 15, and the other end is fitted with a bracket 8.

[0070] The bracket 8 is provided with a first mounting hole, and a first elastic limiting device 7 is installed in the first mounting hole. One end of the first elastic limiting device 7 is pressed onto the bracket 16.

[0071] Furthermore, the bracket 8 is also provided with a second mounting hole, in which a second elastic limiting device 9 is installed, and one end of the second elastic limiting device 9 is spaced at a predetermined distance from the upper valve plate 12.

[0072] like Figure 1 As shown, the flange structure 15 of the base can have multiple mounting holes, into which multiple guide support rods 6 can be installed. The lower end of the guide support rod 6 passes through the mounting hole and is located below the flange structure 15. A protruding limiting part, such as a nut or bolt, can be provided at the lower end of the guide support rod 6. Correspondingly, a threaded section can be provided at the lower end of the guide support rod 6. The combination of these two features prevents the lower end of the guide support rod 6 from protruding through the mounting hole during use. Multiple brackets 16 are fitted onto the lower part of the guide support rod 6. The brackets 16, located on the inner side near the central axis of the pressure relief device, can press against the valve cover to apply pressure to the valve cover.

[0073] A bracket 8 can be fitted onto the upper middle part of the guide support rod 6. A protruding limiting part can also be provided at the top of the guide support rod 6. The limiting part can be in the form of a nut or screw. Correspondingly, a threaded section can be provided at the upper end of the guide support rod 6. The two work together to prevent the upper end of the guide support rod 6 from disengaging from the bracket 8 during the use of the pressure relief device.

[0074] To effectively limit the valve cover, a first elastic limiting device 7 is installed on the bracket 8. The lower end of the first elastic limiting device 7 abuts against the bracket 16, thereby fixing and pressing the valve cover. Specifically, the first elastic limiting device 7 may include: a central rod located in the middle, an outer sleeve fixedly sleeved outside the central rod, and an inner sleeve movably sleeved between the outer sleeve and the central rod. The upper end of the outer sleeve is provided with a top cover, the lower end of the inner sleeve is provided with a bottom cover, a first spring is provided on the lower side of the top cover, a second spring is provided on the upper end of the inner sleeve, and a third spring is provided on the lower end near the bottom cover.

[0075] If the valve cover is lifted a certain distance, which is less than the predetermined distance from the second elastic limiting device 9 to the upper valve plate 12, then under the action of the first elastic limiting device 7, the valve cover will fall back due to the force of the first elastic limiting device 7. The movement trajectory of the valve cover is up and down along the axial direction of the guide tube 11, i.e., the guide support rod 6. Specifically, the valve cover moves upward first under pressure, and then stops moving upward to a certain extent due to its own weight and the downward elastic force of the first elastic limiting device 7. Then it can be reset under the guidance of the guide support rod 6, the guide tube 11, etc.

[0076] If the valve cover is lifted a large distance, greater than the predetermined distance between the second elastic limiting device 9 and the upper valve plate 12, the second elastic limiting device 9 will combine with the first elastic limiting device 7 to apply a downward elastic force to the valve cover, thereby limiting it.

[0077] Overall, in order to effectively limit the valve cover, a first elastic limiting device 7 and a second elastic limiting device 9 are installed on the bracket 8 for graded limiting, ensuring that the valve cover can reliably fall back under different pressures.

[0078] Specifically, the structure of the second elastic limiting device 9 can be similar to that of the first elastic limiting device 7. Of course, the specific structures of the first elastic limiting device 7 and the second elastic limiting device 9 are not limited to the specific structures listed in this application, and they can also take other forms. This application does not make specific limitations here.

[0079] It should be noted that in the description of this application, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more.

[0080] The various embodiments described in this specification are presented in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0081] The above are merely a few embodiments of the present invention. Although the embodiments disclosed in the present invention are as described above, the content is only for the purpose of facilitating understanding of the present invention and is not intended to limit the present invention. Any person skilled in the art to which this invention pertains may make any modifications and changes in the form and details of the embodiments without departing from the spirit and scope disclosed in the present invention. However, the patent protection scope of the present invention shall still be determined by the scope defined in the appended claims.

Claims

1. A pressure relief device, characterized in that, The pressure relief device includes: a base, a valve cover, a heat insulation sleeve, and a sealing mechanism. The base includes: a hollow support section having opposing first and second ends; The valve cover is sealed at the first end of the base. The valve cover includes an upper valve plate and a lower bottom plate that are arranged opposite each other at a certain distance, and a middle end plate that surrounds the upper valve plate and the lower bottom plate. A cooling cavity is formed between the upper valve plate, the middle end plate and the lower bottom plate. At least two hollow guide tubes are provided on the valve cover. The guide tubes are connected to the cooling cavity. Fluid can flow through the cooling cavity through one guide tube and then flow out through the other guide tube to form a first cooling path. The sealing mechanism is disposed between the middle end plate of the valve cover and the first end of the base, and the valve cover and the base cooperate to form a sealed working chamber. The sealing mechanism includes: a first sealing component, a second sealing component, and a third sealing component. The first sealing component is a bevel seal formed between the middle end plate and the first end of the base. The second sealing component is disposed around the first sealing component and includes at least one first annular groove disposed on at least one of the middle end plate and the first end of the base, and a sealing element filled in the first annular groove. The third sealing component is disposed around the second sealing component and includes a second annular groove disposed on at least one of the middle end plate and the first end of the base, and at least the second annular groove is filled with positive pressure gas. The heat insulation sleeve is disposed in the working cavity and can at least be used to insulate the base and valve cover; The first end of the support section is provided with a flange structure, and the flange structure has an opening for the guide tube to pass through; the guide tube is located at the lower end of the flange structure near the support section, and the lower end is provided with a limiting part, the outer dimension of which is larger than the cross-sectional dimension of the opening.

2. The pressure relief device as described in claim 1, characterized in that, The first end of the support section is provided with a flange structure, the end face of the flange structure is provided with the first annular groove, and the middle end plate is provided with an annular protrusion opposite to the first annular groove. The sealing element is pressed into the first annular groove by the annular protrusion.

3. The pressure relief device as described in claim 1, characterized in that, The first end of the support section is provided with a flange structure. The positive pressure gas is an inert gas. The positive pressure gas is distributed in the second annular groove and in the gap between the end face of the flange structure and the middle end plate. The flange structure of the support section is also provided with a vent hole that communicates with the second annular groove.

4. The pressure relief device as described in claim 1, characterized in that, The heat insulation sleeve is any one of the following: a sleeve or annular coil with a refractory castable coating on its surface.

5. The pressure relief device as described in claim 4, characterized in that, The heat insulation sleeve is an annular coil filled with coolant.

6. The pressure relief device as described in claim 1, characterized in that, The lower base plate, on the side opposite to the upper valve plate, is also surrounded by an inverted pyramidal cavity, which is filled with heat-insulating material.

7. The pressure relief device as described in claim 1, characterized in that, The first end of the support section is provided with a flange structure, and the edge of the flange structure is provided with multiple brackets. The brackets are pressed onto the upper valve plate, and a guide support rod is inserted through the bracket. One end of the guide support rod is inserted through the flange structure, and the other end is fitted with a bracket.

8. The pressure relief device as described in claim 7, characterized in that, The bracket is provided with a first mounting hole, and a first elastic limiting device is installed in the first mounting hole. One end of the first elastic limiting device is pressed onto the bracket.

9. The pressure relief device as described in claim 8, characterized in that, The bracket is also provided with a second mounting hole, in which a second elastic limiting device is installed. One end of the second elastic limiting device is spaced at a predetermined distance from the upper valve plate.

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