An overpressure relief assembly and vented cap device

Abstract

The application provides an overpressure relief assembly and an exhaust cover device, the overpressure relief assembly comprises a mounting frame, the mounting frame is provided with a fixing seat for being connected with a launching assembly, the fixing seat and the mounting frame are connected through a safety pin, the mounting frame is provided with a damping buffer, the damping buffer is partially limited to the fixing seat for absorbing vibration and restricting the position of the fixing seat 9. The application limits and restricts the launching assembly through the damping buffer, effectively avoids the damage and displacement of the device caused by impact vibration, prevents the safety pin from being damaged by impact in unnecessary conditions such as low pressure, limits and restricts the mounting seat connected with the launching assembly through the positioning rod in the open cover state, and releases the restriction in the closed cover state, so that the safety pin can be reliably cut off in the emergency state, and reliable opening and overpressure relief in the emergency state are realized.

Description

Technical Field

[0001] This invention relates to the field of security equipment technology, and more specifically, to an overpressure relief component and an exhaust cover device. Background Technology

[0002] For specific high-risk locations such as fuel depots, if an accident such as a fire or explosion occurs, flammable gases and smoke will accumulate rapidly inside the depot, causing the pressure inside the depot to rise. If the gas cannot be effectively released, it will cause the entire depot to deform or even cause a chain explosion and spread of toxic gases, threatening the safety of operators and equipment in adjacent storage depots.

[0003] Overpressure relief components are crucial safety devices for emergency opening of exhaust caps in high-risk locations. They must maintain a closed pressure relief port under normal circumstances but reliably open in emergencies. To address this, Chinese Patent Application No. 202010546949.7 discloses an overpressure relief device with controllable opening mode. When the pressure inside the fuel tank rises to a set threshold, it can automatically open the cap to discharge high-pressure gas to a safe passage. Simultaneously, regardless of whether the pressure inside the tank reaches the set threshold, it can be manually or remotely opened to release toxic and harmful gases from the tank to a safe passage outside. However, even opening under normal pressure will cause the safety pin to break, requiring component replacement and manual resetting after each operation, resulting in high maintenance costs and long downtime. Summary of the Invention

[0004] The problem solved by this invention is that the structure of existing overpressure relief devices is unreasonable, which makes it easy for the safety pin to be damaged under unnecessary circumstances.

[0005] To address the aforementioned problems, the present invention provides an overpressure relief assembly for an exhaust cover device. The overpressure relief assembly includes a mounting frame, a fixing seat provided on the mounting frame for connection to a projectile assembly, a safety pin connecting the fixing seat and the mounting frame, and a damping buffer provided on the mounting frame. The damping buffer is partially and limitedly fitted to the fixing seat to absorb vibration and constrain the position of the fixing seat.

[0006] Preferably, the overpressure relief assembly further includes a positioning rod located on one side of the fixed base, the positioning rod having a first position that forms a limiting constraint on the fixed base and a second position that releases the limiting constraint.

[0007] Preferably, the mounting frame is provided with a guide seat, the positioning rod passes through the guide seat, the positioning rod is sleeved with a spring, the spring is located between the guide seat and the fixed seat, and the fixed seat is provided with a limiting hole; when the positioning rod is in the first position, its end is inserted into the limiting hole.

[0008] Preferably, the mounting frame is provided with a hollow guide sleeve, and the end of the positioning rod away from the fixed seat is connected to a mounting seat. The mounting seat is located inside the guide sleeve and moves back and forth with the opening and closing of the exhaust cover device.

[0009] Preferably, the positioning rod is threadedly connected to the mounting base, and a locking nut is provided at one end of the positioning rod near the mounting base for locking and fixing the positioning rod.

[0010] Preferably, the guide sleeve has axial grooves on both sides; the mounting base is connected to a lever, which passes through the grooves and slides with them; the end of the lever is provided with a rotating shaft for mounting a roller, and the roller and the lever are in clearance fit.

[0011] Preferably, the fixing base includes a base plate, the base plate is provided with a waist-shaped protrusion, the mounting frame is provided with a mounting groove for accommodating the waist-shaped protrusion; the waist-shaped protrusion is provided with a first hole, the first hole extends along the width direction of the waist-shaped protrusion, the mounting groove is provided with a mating hole at a position corresponding to the first hole, and the safety pin passes through the first hole and the mating hole and is then bent and fixed.

[0012] Preferably, the mounting frame is provided with a damping hole, which communicates with the mounting groove. A positioning hole is provided on the fixing seat at a position corresponding to the damping hole. The damping buffer partially enters the positioning hole after passing through the damping hole. A guide groove is provided on the side of the positioning hole away from the base plate.

[0013] Preferably, the fixing base is provided with a central hole, the overpressure relief assembly includes a stud, one end of the stud is threadedly connected to the projectile assembly, and the other end of the stud passes through the central hole and is fixed by a fixing nut.

[0014] The present invention also provides an exhaust cover device, including the above-described overpressure relief assembly, the exhaust cover device further including a wedge seat, the wedge seat being located on the side of the mounting frame away from the projectile assembly, the wedge-shaped surface of the wedge seat driving the positioning rod to move by contacting a roller.

[0015] Preferably, when the opening angle α of the exhaust cover device is 10°-30°, the roller disengages from the wedge-shaped surface, and the positioning rod approaches the fixed seat by the force of the spring to limit its position.

[0016] Compared with the prior art, the overpressure relief assembly and exhaust cover device described in this embodiment of the invention have the following beneficial effects: 1) By setting a safety pin as a vulnerable part, this application can be sheared by the shearing force generated when the high pressure in the site reaches a set threshold, thereby causing the projectile assembly to be thrown out to achieve emergency relief of high-pressure air and avoid further expansion of the accident and damage to personnel and equipment; 2) The projectile assembly is limited and constrained by a damping buffer, while effectively avoiding damage and displacement of the device caused by impact vibration, and preventing the safety pin from being damaged by impact under unnecessary conditions such as low pressure; 3) The positioning rod can limit and constrain the mounting seat connected to the projectile assembly in the open state and release the constraint in the closed state, so that the safety pin can be reliably sheared in the emergency state, realizing reliable opening and overpressure relief in the emergency state; 4) The mechanical transmission enables the cover to automatically return to the initial state after manual or remote opening and closing operations; after emergency opening, only the vulnerable part needs to be replaced to return to the initial state, and it can be reused multiple times. Attached Figure Description

[0017] Figure 1 This is an overall schematic diagram of the overpressure relief assembly described in an embodiment of the present invention; Figure 2 This is a cross-sectional schematic diagram of the overpressure relief assembly described in an embodiment of the present invention; Figure 3 for Figure 2 A schematic diagram of the cross-section along the AA side; Figure 4 for Figure 2 Schematic diagram of the cross section along the BB side; Figure 5 This is an overall schematic diagram of the fixed mounting base according to an embodiment of the present invention; Figure 6 This is a side view of the fixed mounting base described in an embodiment of the present invention; Figure 7 This is a cross-sectional schematic diagram of the fixed mounting base according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the overpressure relief assembly described in an embodiment of the present invention in the open-cover protection state; Figure 9 This is a schematic diagram of the overpressure relief assembly in the closed-cover monitoring state according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the overpressure relief assembly in the emergency opening state according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the overpressure relief assembly described in an embodiment of the present invention at different opening angles.

[0018] Explanation of reference numerals in the attached figures: 1-Mounting frame; 101-Mounting groove; 102-Damping hole; 103-Matching hole; 2-Tuning lever; 3-Roller; 4-Guide sleeve; 5-Mounting base; 6-Spring; 7-Guide seat; 8-Positioning rod; 9-Fixed seat; 91-Base plate; 92-Waist-shaped protrusion; 921-First hole; 922-Positioning hole; 923-Guide groove; 924-Limiting hole; 93-Center hole; 10-Safety pin; 11-Screw; 12-Mounting nut; 13-Spring washer; 14-Locking nut; 15-Retaining ring; 16-Limiting screw; 17-Fixing nut; 18-Stud; 19-Adjusting nut; 20-Damping buffer. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Without conflict, the technical features of the embodiments of the present invention can be combined with each other.

[0020] For high-risk locations such as fuel depots, an explosion or other accident could cause abnormally high pressure and temperature, seriously threatening the safety of surrounding personnel and the structure itself. Therefore, an overpressure relief device is necessary to ensure reliable operation in emergencies. However, existing overpressure relief components cannot open properly under normal pressure; opening them damages the safety pin, requiring component replacement after each operation, resulting in high maintenance costs and prolonged downtime. Therefore, the applicant proposes the following technical solution: like Figure 1-11 As shown, the present invention provides an overpressure relief assembly for an exhaust cover device. The overpressure relief assembly includes a mounting frame 1, the mounting frame 1 is provided with a fixing seat 9 for connection with a projectile assembly; the fixing seat 9 is connected to the mounting frame 1 by a safety pin 10, the mounting frame 1 is provided with a damping buffer 20, the fixing seat 9 is provided with a positioning hole 922, and part of the damping buffer 20 is pressed into the positioning hole 922.

[0021] This design enables the overpressure relief assembly to effectively absorb the impact vibration between the fixed base 9 and the mounting frame 1 under impact and vibration conditions, preventing displacement between the two from damaging the safety pin 10 and avoiding situations where excessive pressure outside the location causes the fixed base 9 to detach from the mounting frame 1.

[0022] When an accidental emergency such as a fire or explosion causes the pressure in a high-risk area to gradually increase, the pressure acts on the projectile assembly, generating a projectile force that propels the assembly along the projectile direction. When the pressure is low, the fixed seat 9 remains constrained within the mounting frame 1 due to the damping friction of the damping buffer 20. When the pressure further increases, causing the projectile force to exceed the damping friction between the damping buffer 20 and the fixed seat 9, the damping buffer 20 disengages from the positioning hole, and the projectile assembly, along with the fixed seat 9, moves linearly along the projectile direction, generating a shearing force on the safety pin 10 between the fixed seat 9 and the mounting frame 1. When the pressure in the area reaches a set threshold, the shearing force cuts the safety pin 10, thereby releasing the constraint of the mounting frame 1 on the fixed seat 9. The projectile assembly, along with the fixed seat 9, is then ejected from the exhaust cover device, and the high-pressure air in the high-risk area is released through the projectile hole to prevent further escalation of the accident. The mounting frame 1 is a rectangular frame structure, which serves as the main body for installing and fixing parts such as the safety pin 10. The projectile assembly is usually embedded in the door body and parallel to the plane where the mounting frame 1 is located.

[0023] As a preferred example of the present invention, the fixing base 9 includes a base plate 91, on which a waist-shaped protrusion 92 is provided. The mounting frame 1 is provided with a mounting groove 101 for accommodating the waist-shaped protrusion 92. The waist-shaped protrusion 92 is provided with a first hole 921, which extends along the width direction of the waist-shaped protrusion 92. The mounting groove 101 is provided with a mating hole 103 at a position corresponding to the first hole 921. The safety pin 10 passes through the first hole 921 and the mating hole 103 and is then bent.

[0024] This setting ensures that the safety pin 10 and the mounting groove on the mounting frame 1 always remain coaxial, so that the shear force can be evenly applied to the safety pin 10 when the projectile assembly is under pressure, avoiding premature breakage or abnormal deformation of the safety pin 10 due to off-center loading, and improving the control accuracy of the discharge threshold; at the same time, it effectively prevents the safety pin 10 from axially popping out of the hole or falling off due to high-frequency vibration or impact, which is conducive to ensuring the safety of the exhaust cover device in the daily duty state.

[0025] Preferably, there are two safety pins 10, spaced apart along the length of the waist-shaped protrusion 92. This arrangement significantly improves the connection rigidity between the fixing seat 9 and the mounting frame 1, preventing the fixing seat from shifting and the safety pins from loosening in high-risk impact and vibration environments; at the same time, it can disperse shear loads, preventing individual safety pins 10 from breaking prematurely due to eccentric force and stress concentration, making the discharge threshold more accurate and stable.

[0026] As an example of the present invention, the mounting frame 1 is provided with a damping hole 102, which communicates with the mounting groove 101. The fixing seat 9 is provided with a positioning hole 922 at a position corresponding to the damping hole 102. The damping buffer 20 enters the positioning hole 922 after passing through the damping hole. The positioning hole 922 is provided with a guide groove 923 on the side away from the base plate 91.

[0027] This design allows the rod of the damping buffer 20 to extend into the positioning hole 922 after passing through the damping hole 102, thus limiting the position of the fixed seat 9 in a static state and preventing it from moving arbitrarily when not in operation. When the projectile assembly is pressed and moved, the fixed seat 9 needs to make a small displacement relative to the damping buffer 20. The guide groove 923 can constrain the direction and distance of the displacement, ensuring that the movement trajectory is straight and preventing rotation or jamming. In use, the damping buffer 20 is locked in a certain position in the guide groove 923, and a preload is applied through the positioning hole 922 to generate static friction to absorb external vibrations. When the internal pressure increases, the projectile force overcomes the damping friction, causing the fixed seat 9 to start moving. At this time, the head of the damping buffer 20 will slide along the guide groove 923 until it slides out of the groove end or disengages from the positioning hole 922, thereby releasing energy.

[0028] Preferably, there are two damping holes 102, located at both ends of the mounting groove 101 along its length. This arrangement ensures that the fixing seat 9 is subjected to uniform force, preventing tilting or jamming due to unilateral damping, and allowing for smoother sliding; it can also significantly absorb impact vibrations, preventing the fixing seat 9 from moving up and down or left and right, and preventing the safety pin 10 from being damaged or accidentally sheared. This application does not limit the shape of the base plate 91; it can be circular or square.

[0029] As a preferred example, the rod of the damping buffer 20 is provided with external threads for engaging with the adjusting nut 19. By rotating the adjusting nut 19 in either the forward or reverse direction, the damping buffer 20 can be moved axially, changing the depth of its head extending into the positioning hole 922 to alter the magnitude of the damping friction. Once the set damping value is reached, the adjusting nut 19 is locked to the outer wall of the mounting frame 1, thereby locking the axial position and damping of the damping buffer 20.

[0030] As an example of the present invention, the mounting frame 1 is provided with two clearance slots 104 located on both sides of the mounting slot 101, and the clearance slots 104 communicate with the damping hole 102. This arrangement can create clearance space for the installation of the damping buffer 20.

[0031] Preferably, the fixing base 9 is provided with a central hole 93, and the overpressure relief assembly includes a stud 18. One end of the stud 18 is threadedly connected to the projectile assembly, and the other end of the stud 18 passes through the central hole 93 and is fixed by a fixing nut 17.

[0032] This configuration ensures a clearance fit between the stud 18 and the center hole 93. When the projectile assembly experiences small displacements under impact or vibration, the safety pin 10 is not subjected to radial force, preload, or shear force, preventing premature fatigue fracture. The center hole 93 serves as a reference hole, ensuring that the stud 18, projectile assembly, and mounting base 9 are coaxially mounted with consistent force directions, resulting in more stable and reliable emergency shearing actions. The fixing nut 17 only provides axial fixation, providing secure restraint under normal conditions and allowing for smooth ejection under overpressure without restricting linear motion in the projectile direction. In this configuration, when the projectile assembly causes the mounting base 9 to move slightly up and down along the mounting groove 101 of the mounting frame 1 under impact and vibration, the shearing pin will not be subjected to force, preventing mechanical damage. As an example of the invention, the center hole 93 is perpendicular to the base plate 91, and there are two fixing nuts 17 to effectively prevent loosening.

[0033] As a preferred example of this application, the overpressure relief assembly further includes a positioning rod 8, which has a first position capable of limiting and constraining the fixed seat 9 and a second position capable of disengaging and releasing the limiting and constraining effect on the fixed seat 9 when in the second position.

[0034] When the exhaust cover device is opened for daily ventilation or maintenance, the positioning rod 8 physically blocks the projectile assembly from moving, preventing the safety pin 10 from developing fatigue cracks or premature breakage due to repeated stress, thus avoiding accidental opening of the exhaust cover in the open state; when the exhaust cover device is closed, the positioning rod 8 is in the second position completely detached from the fixed seat 9, and the safety pin 10 can be normally sheared to project the assembly under overpressure conditions.

[0035] As a preferred example of this application, the mounting frame 1 is provided with a guide seat 7, the positioning rod 8 passes through the guide seat 7, the positioning rod 8 is fitted with a spring 6, the spring 6 is located between the guide seat 7 and the fixing seat 9, and the fixing seat 9 is provided with a limiting hole 924; when the positioning rod 8 is in the first position, one end of it is inserted into the limiting hole 924 and the spring 6 is in a compressed state; when the positioning rod 8 is in the second position, the spring 6 is in a reset state.

[0036] This design allows the positioning rod 8 to move from the second position to the first position during the opening process, overcoming the elastic force of the spring 6, thereby constraining the fixed seat 9. When the projectile assembly drives the fixed seat 9 to make small up-and-down displacements along the mounting groove 101 of the mounting frame 1 under impact and vibration, the safety pin 10 will not be subjected to force and will not cause mechanical damage. During the closing process, the positioning rod 8 automatically disengages from the limiting hole 924 under the restoring force of the spring 6, thereby avoiding interference between the positioning rod 8 and the projectile action of the fixed seat 9 and the projectile assembly, making the whole process more stable and reliable.

[0037] As an example of the present invention, the positioning rod 8 is tapered at one end near the fixed base 9, and the limiting hole 924 is a tapered through hole. This arrangement enables automatic centering, guided insertion, and reliable locking between the positioning rod 8 and the limiting hole 924, effectively reducing the risk of jamming during insertion, ensuring accurate and reliable positioning constraints, while also increasing the contact area, improving load-bearing capacity, and better withstanding the inertial impact during the opening process.

[0038] As a preferred example of this application, the mounting frame 1 is provided with a hollow guide sleeve 4, and the end of the positioning rod 8 away from the fixed seat 9 is connected to the mounting seat 5. The mounting seat 5 is located inside the guide sleeve 4 and moves back and forth with the opening and closing of the exhaust cover device.

[0039] This configuration provides linear guidance and radial limiting constraint for the positioning rod 8 and the mounting base 5, effectively preventing movement deviation and jamming. Automatic mechanical displacement is achieved through the opening and closing action of the exhaust cover device, requiring no additional drive or manual intervention. This improves the synchronization and accuracy of the positioning rod 8's movement and the stability of the device's operation, making it suitable for long-term reliable use in flammable and explosive high-risk locations. The guide sleeve 4 and / or guide seat 7 can be fixed to the mounting frame 1 using screws 11, mounting nuts 12, and spring washers 13; the specific connection relationship is based on existing technology. As an example of this application, the mounting base 5 has a cylindrical structure.

[0040] As an example of this application, the positioning rod 8 is threadedly connected to the mounting base 5, and a locking nut 14 is provided at one end of the positioning rod 8 near the mounting base 5 for locking and fixing the positioning rod 8.

[0041] This design allows for stepless adjustment and precise positioning of the extension length of the positioning rod 8, facilitating the matching of limit holes of different sizes and adjusting the preload generated by the spring 6. The locking nut 14 effectively prevents the positioning rod 8 from loosening, unraveling, or axially shifting under vibration and impact conditions, thus improving the reliability and stability of the entire mechanical interlocking mechanism. Specifically, the mounting base 5 has an internal thread, and the positioning rod 8 has an external thread. By controlling the thread engagement length between the positioning rod 8 and the mounting base 5, the clamping force of the spring 6 can be adjusted to a preset value. Then, rotating the locking nut 14 on the positioning rod 8 causes it to abut against the mounting base 5 to achieve locking and fixation.

[0042] As an example of this application, the guide sleeve 4 has axial grooves 41 on both sides; the mounting base 5 is connected to a lever 2, which passes through the grooves 41 and slides with them; the end of the lever 2 is provided with a rotating shaft for mounting a roller 3, and the roller 3 and the lever 2 are in clearance fit.

[0043] This design utilizes the cooperation between the slide groove 41 and the lever 2 to achieve precise axial guidance and radial limiting, effectively avoiding movement deviation and jamming. The symmetrical layout of the stepped shaft and roller 3 achieves balanced force and stable movement. The clearance fit of the roller 3 enables low-friction rolling, significantly reducing movement resistance and wear, effectively ensuring the smoothness and durability of the switch cover's linkage action, and meeting the requirements for long-term stable operation under high-risk conditions. Specifically, a threaded hole is machined in the middle of the lever 2 along the normal direction of the axis, perpendicularly inserting into the circular through hole of the mounting base 5. The limiting screw 16 passes through the positioning hole of the mounting base 5 and is tightened into the threaded hole of the lever 2, making it a single unit.

[0044] Preferably, there are two rotating shafts located on both sides of the guide sleeve 4. This arrangement ensures that the positioning rod 8 experiences balanced force and stable radial constraint during reciprocating motion, effectively preventing movement deviation, jamming, and binding phenomena. It also ensures that the lever 2, mounting base 5, and positioning rod 8 move synchronously, improves the rigidity and impact resistance of the overall structure, reduces motion wear and noise, and makes the mechanical interlocking action more stable and reliable, suitable for long-term stable operation under high-risk working conditions. A retaining ring 15 is provided on the side of the roller 3 away from the guide sleeve 4 for axial limiting.

[0045] The present invention also provides an exhaust cover device, including the above-mentioned overpressure relief assembly. The exhaust cover device further includes a wedge-shaped seat, which is located on the side of the mounting frame 1 away from the projectile assembly. The roller 3 can roll along the wedge-shaped surface of the wedge-shaped seat. When the exhaust cover device rotates to a certain angle, the roller 3 disengages from the wedge-shaped surface, and the positioning rod 8 approaches the fixing seat 9 by the force of the spring 6 to limit its movement.

[0046] This design allows the roller 3 to disengage from the wedge surface when the exhaust cover device rotates to a set angle. The spring 6 then drives the positioning rod 8 to automatically approach and limit the fixed seat 9, achieving a purely mechanical automatic interlock between the switching action and the constraint / unlocking state of the positioning rod 8. This requires no electrical control or manual intervention, and the action response is timely and highly synchronized. The rolling engagement of the wedge surface reduces motion resistance and wear, improving the smoothness of the mechanism's operation. The disengaged trigger structure ensures accurate and reliable positioning rod constraint action, effectively withstands the inertial impact of opening the cover, and protects the safety pin from damage, ensuring the long-term reliability of the exhaust cover device in high-risk locations.

[0047] When the exhaust cover is opened, the spring 6 presses the positioning rod 8 tightly within the limiting hole 924 of the fixed seat 9. When the exhaust cover is slowly closed, the exhaust cover drives the projectile assembly to rotate counterclockwise around the rotation center. When it rotates to about 15°, the roller 3 begins to contact and press against the wedge surface of the wedge seat, and the wedge surface generates a reaction force on the roller 3. If the cover is closed further, the reaction force of the wedge surface on the roller 3 also increases further, causing the lever 2 and the roller 3 to drive the positioning rod 8 to move and compress the spring 6. The positioning rod 8 drives the lever 2 and the roller 3 to retract from the fixed seat 9 under the guidance and limiting action of the guide sleeve 4 and the guide seat 7. When the exhaust cover is closed, the spring 6 is further compressed under the limiting action of the wedge seat, and the positioning rod 8 completely disengages from the limiting hole 924 of the fixed seat 9.

[0048] When the exhaust cover device is in the closed position, the damping buffer 20 located on the mounting frame 1 is pressed into the positioning hole 922 of the fixed seat 9, and a damping friction force is generated between the two. When the high-risk location is in an impact vibration environment, it can effectively absorb the impact vibration generated between the projectile assembly, the fixed seat 9 and the mounting frame 1 in the impact vibration environment, prevent the displacement between them from damaging the safety pin 10, and thus avoid the fixed seat 9 from coming out of the mounting frame 1 under non-high pressure conditions.

[0049] In the event of an accident such as a fire or explosion, the pressure in the high-risk area gradually increases and acts on the projectile assembly, generating a projectile force that propels the assembly out along the projectile direction. When the pressure is low, the fixed seat 9 remains constrained within the mounting frame 1 by the damping friction of the damping buffer 20. As the pressure further increases, the projectile force becomes greater than the damping friction between the damping buffer 20 and the fixed seat 9, causing the damping buffer 20 to disengage from the positioning hole 922. The projectile assembly, along with the stud 18, fixing nut 17, and fixed seat 9, moves linearly along the projectile direction, generating a shearing force on the safety pin 10 between the fixed seat 9 and the mounting frame 1. When the pressure in the area reaches a set threshold, the shearing force cuts the safety pin 10, thereby releasing the constraint of the mounting frame 1 on the fixed seat 9. The projectile assembly, along with the stud 18, fixing nut 17, and fixed seat 9, is then ejected from the exhaust cover device, and the high-pressure air in the high-risk area is released through the projectile hole to prevent further escalation of the accident.

[0050] In the closed-cover monitoring state, if the upper-level monitoring system issues a remote opening command to open the exhaust cover device, the exhaust cover device, together with the projectile assembly and safety pin assembly, will rotate counterclockwise around the center of rotation under the action of the opening torque. During this process, the positioning rod 8, under the action of the spring 6, drives the roller 3 to roll along the wedge surface of the wedge seat, thereby causing the positioning rod 8 to move linearly in the direction of the spring's rebound force, gradually inserting it into the limiting hole 924 of the fixed seat 9. When the opening angle is ≥15°, the roller 3 completely disengages from the wedge surface constraint of the wedge seat, and the positioning rod 8 is completely pressed into the limiting hole 924 of the fixed seat 9 under the action of the spring 6, thereby completely constraining the fixed seat 9 and the projectile assembly. When the exhaust cover device is opened to the limited position, the inertial impact force of the projectile assembly itself will be transmitted from the fixed seat 9 to the positioning rod 8, avoiding repeated action on the safety pin 10 and causing damage.

[0051] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. An overpressure relief assembly for use in an exhaust cover device, the overpressure relief assembly comprising a mounting frame (1), the mounting frame (1) being provided with a fixing seat (9) for connection with a projectile assembly, characterized in that, The fixed seat (9) is connected to the mounting frame (1) by a safety pin (10). The mounting frame (1) is provided with a damping buffer (20). The damping buffer (20) is partially fitted to the fixed seat (9) to absorb vibration and constrain the position of the fixed seat (9).

2. The overpressure relief assembly according to claim 1, characterized in that, It also includes a positioning rod (8), which is located on one side of the fixed seat (9). The positioning rod (8) has a first position that forms a limiting constraint on the fixed seat (9) and a second position that releases the limiting constraint.

3. The overpressure relief assembly according to claim 2, characterized in that, The mounting frame (1) is provided with a guide seat (7), the positioning rod (8) passes through the guide seat (7), the positioning rod (8) is sleeved with a spring (6), the spring (6) is located between the guide seat (7) and the fixed seat (9), and the fixed seat (9) is provided with a limiting hole (924); when the positioning rod (8) is in the first position, its end is inserted into the limiting hole (924).

4. The overpressure relief assembly according to claim 3, characterized in that, The mounting frame (1) is provided with a hollow guide sleeve (4), and the end of the positioning rod (8) away from the fixed seat (9) is connected to a mounting seat (5). The mounting seat (5) is located inside the guide sleeve (4) and moves back and forth with the opening and closing of the exhaust cover device.

5. The overpressure relief assembly according to claim 4, characterized in that, The positioning rod (8) is threadedly connected to the mounting base (5), and a locking nut (14) is provided at one end of the positioning rod (8) near the mounting base (5) for locking and fixing the positioning rod (8).

6. The overpressure relief assembly according to claim 4, characterized in that, The guide sleeve (4) has axial grooves (41) on both sides; the mounting base (5) is connected to a lever (2), the lever (2) passes through the groove (41) and slides with it; the end of the lever (2) is provided with a rotating shaft for mounting a roller (3), and the roller (3) and the lever (2) are in clearance fit.

7. The overpressure relief assembly according to claim 1, characterized in that, The fixing base (9) includes a base plate (91), on which a waist-shaped protrusion (92) is provided. The mounting frame (1) is provided with a mounting groove (101) for accommodating the waist-shaped protrusion (92). The waist-shaped protrusion (92) is provided with a first hole (921), which extends along the width direction of the waist-shaped protrusion (92). The mounting groove (101) is provided with a mating hole (103) at a position corresponding to the first hole (921). The safety pin (10) passes through the first hole (921) and the mating hole (103) and is then bent and fixed.

8. The overpressure relief assembly according to claim 7, characterized in that, The mounting frame (1) is provided with a damping hole (102), which is connected to the mounting groove (101). The fixing seat (9) is provided with a positioning hole (922) at a position corresponding to the damping hole (102). The damping buffer (20) enters the positioning hole (922) after passing through the damping hole (102). The positioning hole (922) is provided with a guide groove (923) on the side away from the base plate (91).

9. The overpressure relief assembly according to claim 1, characterized in that, The fixed base (9) is provided with a central hole (93). The overpressure relief assembly includes a stud (18). One end of the stud (18) is threadedly connected to the projectile assembly. The other end of the stud (18) passes through the central hole (93) and is fixed by a fixing nut (17).

10. An exhaust cap device comprising the overpressure relief assembly according to any one of claims 1-9, the exhaust cap device further comprising a wedge seat located on the side of the mounting frame (1) away from the projectile assembly, the wedge-shaped surface of the wedge seat driving a positioning rod (8) to move by contacting a roller (3).

11. The exhaust cover device according to claim 10, characterized in that, When the opening angle α of the exhaust cover device is 10°-30°, the roller (3) disengages from the wedge-shaped surface, and the positioning rod (8) approaches the fixed seat (9) by the force of the spring (6) to limit its position.

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