Explosion-proof automatic pressure relief device for acetic anhydride storage tank

Abstract

The invention provides an anti-explosion automatic pressure relief device for an acetic anhydride storage tank, and relates to the technical field of pressure relief devices. A threaded connecting base is welded to the bottom end face of the pressure release valve body and connected to the acetic anhydride storage tank in a threaded mode, a sealing cover is screwed on the pressure release valve body in a threaded mode, and a pressure release pipeline is welded to the outer wall of the pressure release valve body. A first baffle ring is welded to the inner wall of the pressure release valve body, a sealing block slides in the pressure release valve body, and the bottom end face of the sealing block makes contact with the top end face of the first baffle ring. In the pressure relief assembly, the pre-tightening force of a spiral spring can be changed by rotating a threaded pipe, the pressure relief pressure threshold value is directly adjusted, operation is easy and convenient, and precision is controllable; after a second hydraulic cylinder of the adjusting assembly drives a spring rod to make contact with a sealing block, additional resistance can be increased for upward movement of the sealing block, the pressure adjusting range is further refined, the adaptability of the device to different air pressure environments is greatly improved through a double-adjusting mechanism, and the problems that a traditional pressure release valve is single in pressure setting and difficult to flexibly adjust are solved.

Description

Technical Field

[0001] This invention relates to the field of pressure relief device technology, and in particular to an explosion-proof automatic pressure relief device for acetic anhydride storage tanks. Background Technology

[0002] Acetic anhydride storage tanks are specialized containers used to store acetic anhydride. They are widely used in chemical, pharmaceutical, and dye industries. Acetic anhydride storage tanks need to be equipped with pressure relief devices for depressurization.

[0003] Although the existing device can relieve pressure, it cannot adjust the pressure value according to the usage requirements, resulting in low adjustability; during pressure relief, the existing device ejects gas at high speed, posing a significant safety hazard. Summary of the Invention

[0004] This invention relates to an explosion-proof automatic pressure relief device for acetic anhydride storage tanks, which solves the problems of existing devices, which, although capable of pressure relief, cannot adjust the pressure value according to usage needs and have low adjustability; and that existing devices cause high-speed gas jets during pressure relief, posing a significant safety hazard.

[0005] This invention provides an explosion-proof automatic pressure relief device for acetic anhydride storage tanks, specifically comprising: a pressure relief valve body; a threaded connection seat welded to the bottom end face of the pressure relief valve body, the threaded connection seat being threadedly connected to the acetic anhydride storage tank; a sealing cap threadedly tightened onto the pressure relief valve body; a pressure relief pipe welded to the outer wall of the pressure relief valve body; a first retaining ring welded to the inner wall of the pressure relief valve body; a sealing block sliding inside the pressure relief valve body, the bottom end face of the sealing block contacting the top end face of the first retaining ring; the outer wall of the sealing block contacting one end of the left side of the pressure relief pipe, at which point the pressure relief pipe is in a sealed state; when the sealing block moves upward, the pressure relief pipe is in a de-sealed state; a threaded pipe threadedly connected to the sealing cap; a guide rod welded to the top end face of the sealing block; the guide rod passing through the threaded pipe; the outer wall of the guide rod contacting the inner wall of the threaded pipe; a second retaining ring and a helical spring sleeved on the guide rod; the lower end of the helical spring contacting the top end face of the sealing block; the upper end of the helical spring contacting the second retaining ring; and the upper end face of the second retaining ring contacting the bottom end face of the threaded pipe.

[0006] Furthermore, the first retaining ring, threaded pipe, sealing block, guide rod, second retaining ring, and helical spring together constitute the pressure relief assembly; a ring-shaped sealing gasket is fitted on the threaded connection seat. The sealing gasket is made of rubber. When the pressure relief valve body is tightened on the acetic anhydride storage tank through the threaded connection seat, the sealing gasket is flattened.

[0007] Furthermore, an emergency assembly is installed on the guide rod. The emergency assembly consists of a connecting block and a first hydraulic cylinder. The connecting block is fixed to the upper end face of the guide rod. The connecting block is a rectangular block structure. The first hydraulic cylinder is fixed to the upper end face of the sealing cover. The protruding end of the first hydraulic cylinder is fixed to the connecting block.

[0008] Furthermore, an adjustment assembly is installed on the sealing cover. The adjustment assembly consists of a second hydraulic cylinder and a spring rod. The second hydraulic cylinder is symmetrically welded to the bottom end of the sealing cover. A spring rod is fixed to the protruding end of each second hydraulic cylinder. The spring rod is located above the sealing block. The second hydraulic cylinder and the spring rod are structures that increase the resistance to the upward movement of the sealing block.

[0009] Furthermore, an auxiliary component is installed on the pressure relief pipe. The auxiliary component consists of a connecting seat, a first discharge pipe, a sleeve, and a second discharge pipe. The connecting seat is welded onto the pressure relief pipe, and the pressure relief pipe is connected to the connecting seat. The connecting seat is a hollow structure, and the first discharge pipe is welded in a ring array on the outer wall of the connecting seat. The first discharge pipe is connected to the connecting seat.

[0010] Furthermore, a sleeve is welded onto the pressure relief pipe, which is fitted over the connecting seat and the first discharge pipe. A second discharge pipe is welded to the right end face of the sleeve.

[0011] Furthermore, a third hydraulic cylinder is fixed on the main body of the pressure relief valve. The protruding end of the third hydraulic cylinder passes through the main body of the pressure relief valve and contacts the outer wall of the sealing block.

[0012] Furthermore, a fixing component is installed on the main body of the pressure relief valve. The fixing component consists of a mounting arm and a threaded rod. The mounting arm is welded to the outer wall of the main body of the pressure relief valve, and a threaded rod is threadedly connected to the mounting arm. When the threaded rod is tightened, the lower end of the threaded rod abuts against the sealing cover.

[0013] Furthermore, an adjusting seat is welded to the outer wall of the main body of the pressure relief valve, and the adjusting seat has a hexagonal structure.

[0014] This invention provides an explosion-proof automatic pressure relief device for acetic anhydride storage tanks, which has the following beneficial effects: This application features excellent adjustability and pressure control accuracy. Through the cooperation of the pressure relief component and the adjustment component, it can flexibly adapt to different working conditions. In the pressure relief component, rotating the threaded pipe can change the preload of the helical spring, directly adjusting the pressure relief threshold. The operation is simple and the accuracy is controllable. After the second hydraulic cylinder of the adjustment component drives the spring rod to contact the sealing block, it can add additional resistance to the upward movement of the sealing block, further refining the pressure adjustment range. The dual adjustment mechanism greatly improves the adaptability of the device to different air pressure environments and solves the problem of the traditional pressure relief valve having a single pressure setting and being difficult to adjust flexibly.

[0015] This application demonstrates outstanding safety and reliability, with a multi-layered sealing and protective structure effectively reducing the risk of leakage. The rubber gasket on the threaded connection seat is compacted during installation, enhancing the sealing performance between the main body and the storage tank. The fixing component locks the sealing cover to the main body via a threaded rod, preventing leakage caused by loosening at the connection due to vibration or other factors. The auxiliary component reduces the gas flow rate through multi-stage diversion and buffering. The first discharge pipe disperses and discharges the gas, while the sleeve and the second discharge pipe further buffer the flow, significantly reducing the safety hazards that may be caused by direct discharge of high-pressure gas. This is especially suitable for volatile media such as acetic anhydride that require strict control of the discharge rate.

[0016] This application's emergency and interlocking mechanisms provide protection under extreme operating conditions and enhance the device's emergency response capabilities. The first hydraulic cylinder of the emergency component can forcibly move the sealing block upwards in an emergency, achieving rapid pressure relief and preventing a sudden pressure surge in the storage tank that could lead to an explosion. The third hydraulic cylinder can interlock by pressing against the sealing block, preventing unnecessary pressure relief or accidental movement of the sealing block, ensuring the stability of the device under normal operating conditions. This dual mechanism forms a two-way guarantee of "emergency pressure relief" and "safety interlocking," making it more reliable in responding to emergencies.

[0017] This application optimizes the ease of installation and maintenance. The hexagonal adjustment seat facilitates quick disassembly of the main body with a wrench, reducing the difficulty of maintenance. Each component adopts a stable structure such as welding or threaded connection, which takes into account both connection strength and ease of disassembly and assembly, reducing the workload of daily maintenance.

[0018] Overall, the device achieves a harmonious balance of adjustability, safety, emergency response, and convenience through structural innovation. It effectively ensures the safe operation of acetic anhydride storage tanks, reduces risks caused by abnormal gas pressure, and adapts to diverse operational needs, thus possessing high practical value and significance for wider application. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0020] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0021] In the attached diagram: Figure 1 This invention shows an axial view of the acetic anhydride storage tank explosion-proof automatic pressure relief device. Figure 2 This is a schematic diagram of the main structure of the explosion-proof automatic pressure relief device for acetic anhydride storage tank of the present invention; Figure 3 This shows a partially cut-out axial view of the acetic anhydride storage tank explosion-proof automatic pressure relief device of the present invention; Figure 4This is a schematic front view of the partially cut-open acetic anhydride storage tank explosion-proof automatic pressure relief device of the present invention; Figure 5 This shows a schematic diagram of the axial view structure of the auxiliary component of the present invention after partial cross-section; Figure 6 The present invention is shown. Figure 5 A schematic diagram of the axial view structure after further cross-section; Figure 7 A front view schematic diagram of the pressure relief assembly of the present invention is shown; Figure 8 A schematic axial view of the pressure relief assembly of the present invention is shown.

[0022] List of reference numerals 1. Pressure relief valve body; 101. Threaded connection seat; 102. Sealing gasket; 103. Sealing cover; 104. Adjusting seat; 105. Pressure relief pipe; 2. Pressure relief assembly; 201. First retaining ring; 202. Threaded pipe; 203. Sealing block; 204. Guide rod; 205. Second retaining ring; 206. Helical spring; 3. Emergency assembly; 301. Connecting block; 302. First hydraulic cylinder; 4. Adjusting assembly; 401. Second hydraulic cylinder; 402. Spring rod; 5. Auxiliary assembly; 501. Connecting seat; 502. First discharge pipe; 503. Sleeve; 504. Second discharge pipe; 6. Third hydraulic cylinder; 7. Fixing assembly; 701. Mounting arm; 702. Threaded rod. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1: Please refer to Figures 1 to 8 : This invention proposes an explosion-proof automatic pressure relief device for acetic anhydride storage tanks, comprising: a pressure relief valve body 1; a threaded connection seat 101 welded to the bottom end face of the pressure relief valve body 1, the threaded connection seat 101 being threadedly connected to the acetic anhydride storage tank; a sealing cap 103 threadedly tightened onto the pressure relief valve body 1; a pressure relief pipe 105 welded to the outer wall of the pressure relief valve body 1; a first retaining ring 201 welded to the inner wall of the pressure relief valve body 1; a sealing block 203 sliding inside the pressure relief valve body 1, the bottom end face of the sealing block 203 contacting the top end face of the first retaining ring 201; and the outer wall of the sealing block 203 contacting one end of the left side of the pressure relief pipe 105, at which point the pressure relief pipe 105 is in a sealed state. When the sealing block 203 moves upward, the pressure relief pipe 105 is in a de-sealed state. A threaded pipe 202 is threadedly connected to the sealing cap 103; a guide rod 204 is welded to the top end face of the sealing block 203, the guide rod 204 passing through the threaded pipe. The outer wall of the guide rod 204 contacts the inner wall of the threaded pipe 202. A second retaining ring 205 and a helical spring 206 are sleeved on the guide rod 204. The lower end of the helical spring 206 contacts the top surface of the sealing block 203, and the upper end of the helical spring 206 contacts the second retaining ring 205. The upper end surface of the second retaining ring 205 contacts the bottom end surface of the threaded pipe 202. During depressurization, when the gas pressure in the acetic anhydride storage tank increases significantly, the gas pushes the sealing block 203 upward, compressing the helical spring 206. The gas is then depressurized through the depressurization pipe 105. When the depressurization pressure value needs to be adjusted, the threaded pipe 202 is rotated, causing it to move downward. The threaded pipe 202 then compresses the second retaining ring 205 and the helical spring 206. When the helical spring 206 is compressed, the depressurization pressure value is adjusted. Compared with existing devices, this device has high adjustability.

[0025] The first retaining ring 201, threaded pipe 202, sealing block 203, guide rod 204, second retaining ring 205, and helical spring 206 together constitute the pressure relief assembly 2. A ring-shaped sealing gasket 102 is fitted on the threaded connection seat 101. The sealing gasket 102 is made of rubber. When the pressure relief valve body 1 is tightened on the acetic anhydride storage tank through the threaded connection seat 101, the sealing gasket 102 is flattened. During use, the sealing gasket 102 can improve the sealing performance between the pressure relief valve body 1 and the acetic anhydride storage tank and prevent air leakage.

[0026] Emergency component 3 is installed on guide rod 204. Emergency component 3 consists of connecting block 301 and first hydraulic cylinder 302. Connecting block 301 is fixed on the upper end face of guide rod 204. Connecting block 301 is a rectangular block structure. First hydraulic cylinder 302 is fixed on the upper end face of sealing cover 103. The extended end of first hydraulic cylinder 302 is fixed on connecting block 301. When emergency pressure relief is required, first hydraulic cylinder 302 is driven to extend. First hydraulic cylinder 302 drives connecting block 301, guide rod 204 and sealing block 203 to move upward to complete the pressure relief action.

[0027] The sealing cover 103 is equipped with an adjustment assembly 4, which consists of a second hydraulic cylinder 401 and a spring rod 402. The second hydraulic cylinders 401 are symmetrically welded to the bottom end of the sealing cover 103. A spring rod 402 is fixed to the extended end of each second hydraulic cylinder 401. The spring rod 402 is located above the sealing block 203. The second hydraulic cylinders 401 and the spring rods 402 are structures that increase the resistance to the upward movement of the sealing block 203. In use, the two second hydraulic cylinders 401 are driven to extend, and the two second hydraulic cylinders 401 drive the two spring rods 402 to move downward until the extended end of the spring rod 402 contacts the upper end surface of the sealing block 203. When the sealing block 203 moves upward, the resistance is increased by the obstruction of the spring rod 402, thereby realizing the adjustment of the pressure relief value, which has high adjustability.

[0028] The pressure relief pipe 105 is equipped with an auxiliary component 5, which consists of a connecting seat 501, a first discharge pipe 502, a sleeve 503, and a second discharge pipe 504. The connecting seat 501 is welded onto the pressure relief pipe 105 and is connected to the connecting seat 501. The connecting seat 501 is a hollow structure, and the first discharge pipes 502 are welded in a ring array on the outer wall of the connecting seat 501. The first discharge pipes 502 are connected to the connecting seat 501. When depressurizing, the gas enters the connecting seat 501 through the pressure relief pipe 105 and then exits through the six first discharge pipes 502, which can reduce the gas flow rate and ensure the safety of depressurization.

[0029] The pressure relief pipe 105 is welded with a sleeve 503, which is fitted onto the outside of the connecting seat 501 and the first discharge pipe 502. The right end face of the sleeve 503 is welded with a second discharge pipe 504. Gas is discharged through the six first discharge pipes 502 and then enters the sleeve 503, and then is discharged through the second discharge pipe 504, which reduces the flow rate of the pressure relief gas and ensures high safety.

[0030] The pressure relief valve body 1 is fixed with a third hydraulic cylinder 6. The extended end of the third hydraulic cylinder 6 passes through the body of the pressure relief valve body 1 and contacts the outer wall of the sealing block 203. When locking the sealing block 203, the third hydraulic cylinder 6 can be driven to extend. The third hydraulic cylinder 6 can press the sealing block 203 to complete the locking of the sealing block 203.

[0031] The pressure relief valve body 1 is equipped with a fixing component 7, which consists of a mounting arm 701 and a threaded rod 702. The mounting arm 701 is welded to the outer wall of the pressure relief valve body 1, and the threaded rod 702 is threadedly connected to the mounting arm 701. When the threaded rod 702 is tightened, the lower end of the threaded rod 702 abuts against the sealing cover 103, which can prevent the sealing cover 103 from loosening and thus prevent air leakage at the connection between the sealing cover 103 and the pressure relief valve body 1.

[0032] Example 2, based on Example 1, such as Figures 1-8 As shown, an adjusting seat 104 is welded to the outer wall of the pressure relief valve body 1. The adjusting seat 104 has a hexagonal structure. When disassembling the pressure relief valve body 1, a wrench can be used to lock onto the adjusting seat 104 and rotate it, which improves the convenience of disassembling the pressure relief valve body 1 and makes it highly practical.

[0033] The working principle of this embodiment is as follows: During installation, the pressure relief valve body 1 is threadedly connected to the acetic anhydride storage tank via the threaded connection seat 101 at the bottom. The rubber sealing gasket 102, which is fitted onto the threaded connection seat 101, is flattened during tightening, enhancing the sealing between the pressure relief valve body 1 and the storage tank and preventing air leakage. The hexagonal adjustment seat 104 on the outer wall of the pressure relief valve body 1 facilitates disassembly and can be quickly disassembled and assembled by using a wrench to engage and rotate. Under normal operating conditions, the pressure relief assembly 2, composed of the first retaining ring 201, threaded pipe 202, sealing block 203, guide rod 204, second retaining ring 205, and helical spring 206, dominates the pressure relief control: the first retaining ring 201 on the inner wall of the pressure relief valve body 1 supports the sealing block 203, and the bottom of the sealing block 203 is flush with the sealing block 203. The first retaining ring 201 contacts and its outer wall adheres to the left end of the pressure relief pipe 105, keeping the pressure relief pipe 105 in a sealed state. When the gas pressure inside the storage tank rises to the set value, the gas pushes the sealing block 203 upward, compressing the helical spring 206 sleeved on the guide rod 204. The lower end of the spring contacts the sealing block 203, and the upper end contacts the second retaining ring 205. The second retaining ring 205 is limited by the bottom end of the threaded pipe 202. At this time, the sealing block 203 separates from the pressure relief pipe 105, the pipe is unsealed, and the gas is discharged through the pressure relief pipe 105. If it is necessary to adjust the pressure relief value, the threaded pipe 202 on the sealing cover 103 can be rotated to move it downward and squeeze the second retaining ring 205 and the helical spring 206. The pressure can be adjusted by changing the spring preload. The adjustment component 4 further optimizes pressure control: when the second hydraulic cylinder 401, symmetrically positioned at the bottom of the sealing cover 103, extends, it drives the spring rod 402 to move down to contact the upper surface of the sealing block 203. When the sealing block 203 moves up, the spring rod 402 forms additional resistance, further adjusting the pressure relief pressure and enhancing adjustment flexibility; the auxiliary component 5 ensures exhaust safety: after the gas enters the hollow connecting seat 501 through the pressure relief pipe 105, it is dispersed and discharged through the first discharge pipe 502 in the annular array, reducing the initial flow velocity; the discharged gas enters the sleeve 503 sleeved outside the connecting seat 501 and the first discharge pipe 502, and is finally discharged through the second discharge pipe 504. The double buffer further reduces the flow velocity and improves the pressure relief safety. The emergency and locking mechanisms provide multiple safeguards: In the emergency component 3, the first hydraulic cylinder 302 at the upper end of the sealing cover 103 is connected to the connecting block 301 at the top of the guide rod 204. In an emergency, the extension of the hydraulic cylinder can directly drive the connecting block 301, the guide rod 204, and the sealing block 203 to move upward, forcibly completing the pressure relief; The third hydraulic cylinder 6 is fixed on the pressure relief valve body 1, and its extended end passes through the pressure relief valve body 1 and contacts the outer wall of the sealing block 203. When extended, it can press against the sealing block 203 to achieve locking and prevent unnecessary movement; The fixing component 7 stabilizes the sealing cover 103 through the threaded rod 702 on the mounting arm 701: After the threaded rod 702 is tightened, its lower end presses against the sealing cover 103 to prevent the sealing cover 103 from loosening and causing air leakage at the connection.

Claims

1. An explosion-proof automatic pressure relief device for an acetic anhydride storage tank, characterized in that, include: The pressure relief valve body (1) has a threaded connection seat (101) welded to its bottom end face. The threaded connection seat (101) is threadedly connected to the acetic anhydride storage tank. A sealing cap (103) is threadedly tightened on the pressure relief valve body (1). A pressure relief pipe (105) is welded to the outer wall of the pressure relief valve body (1). A first retaining ring (201) is welded to the inner wall of the pressure relief valve body (1). A sealing block (203) slides inside the pressure relief valve body (1). The bottom end face of the sealing block (203) contacts the top end face of the first retaining ring (201). The outer wall of the sealing block (203) contacts the left end of the pressure relief pipe (105). At this time, the pressure relief pipe (105) is in a sealed state. When the sealing block (203) After moving upwards, the pressure relief pipe (105) is in a released state; the sealing cover (103) is threaded with a threaded pipe (202), and a guide rod (204) is welded to the top surface of the sealing block (203). The guide rod (204) passes through the threaded pipe (202), and the outer wall of the guide rod (204) contacts the inner wall of the threaded pipe (202). A second retaining ring (205) and a helical spring (206) are sleeved on the guide rod (204). The lower end of the helical spring (206) contacts the top surface of the sealing block (203), and the upper end of the helical spring (206) contacts the second retaining ring (205). The upper end surface of the second retaining ring (205) contacts the bottom end surface of the threaded pipe (202).

2. The explosion-proof automatic pressure relief device for an acetic anhydride storage tank according to claim 1, characterized in that, The first retaining ring (201), the threaded pipe (202), the sealing block (203), the guide rod (204), the second retaining ring (205), and the helical spring (206) together form the pressure relief assembly (2); a ring-shaped sealing gasket (102) is fitted on the threaded connection seat (101). The sealing gasket (102) is made of rubber. When the pressure relief valve body (1) is tightened on the acetic anhydride storage tank through the threaded connection seat (101), the sealing gasket (102) is flattened.

3. The explosion-proof automatic pressure relief device for an acetic anhydride storage tank according to claim 2, characterized in that, An emergency component (3) is installed on the guide rod (204). The emergency component (3) consists of a connecting block (301) and a first hydraulic cylinder (302). The connecting block (301) is fixed on the upper end face of the guide rod (204). The connecting block (301) is a rectangular block structure. The first hydraulic cylinder (302) is fixed on the upper end face of the sealing cover (103). The extended end of the first hydraulic cylinder (302) is fixed on the connecting block (301).

4. The explosion-proof automatic pressure relief device for an acetic anhydride storage tank according to claim 3, characterized in that, An adjustment assembly (4) is installed on the sealing cover (103). The adjustment assembly (4) consists of a second hydraulic cylinder (401) and a spring rod (402). The second hydraulic cylinder (401) is symmetrically welded to the bottom end of the sealing cover (103). A spring rod (402) is fixed to the protruding end of each second hydraulic cylinder (401). The spring rod (402) is located above the sealing block (203). The second hydraulic cylinder (401) and the spring rod (402) are structures that increase the resistance to the upward movement of the sealing block (203).

5. The explosion-proof automatic pressure relief device for an acetic anhydride storage tank according to claim 4, characterized in that, An auxiliary component (5) is installed on the pressure relief pipe (105). The auxiliary component (5) consists of a connecting seat (501), a first discharge pipe (502), a sleeve (503), and a second discharge pipe (504). The connecting seat (501) is welded on the pressure relief pipe (105). The pressure relief pipe (105) is connected to the connecting seat (501). The connecting seat (501) is a hollow structure. The first discharge pipe (502) is welded in a ring array on the outer wall of the connecting seat (501). The first discharge pipe (502) is connected to the connecting seat (501).

6. The explosion-proof automatic pressure relief device for an acetic anhydride storage tank according to claim 5, characterized in that, A sleeve (503) is welded onto the pressure relief pipe (105). The sleeve (503) is fitted onto the outside of the connecting seat (501) and the first discharge pipe (502). A second discharge pipe (504) is welded onto the right end face of the sleeve (503).

7. The explosion-proof automatic pressure relief device for an acetic anhydride storage tank according to claim 6, characterized in that, A third hydraulic cylinder (6) is fixed on the pressure relief valve body (1). The protruding end of the third hydraulic cylinder (6) passes through the pressure relief valve body (1) and contacts the outer wall of the sealing block (203).

8. The explosion-proof automatic pressure relief device for an acetic anhydride storage tank according to claim 7, characterized in that, The pressure relief valve body (1) is equipped with a fixing component (7), which consists of a mounting arm (701) and a threaded rod (702). The mounting arm (701) is welded to the outer wall of the pressure relief valve body (1), and the threaded rod (702) is threadedly connected to the mounting arm (701). When the threaded rod (702) is tightened, the lower end of the threaded rod (702) abuts against the sealing cover (103).

9. The explosion-proof automatic pressure relief device for an acetic anhydride storage tank according to claim 8, characterized in that, The pressure relief valve body (1) has an adjusting seat (104) welded on its outer wall. The adjusting seat (104) has a hexagonal structure.

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