Magnetic suction sealing type rapid cooling explosion-proof liquefied gas tank car manhole fire extinguishing device

Abstract

This invention relates to a magnetically sealed, rapidly cooling, explosion-proof liquefied gas tanker manhole fire extinguishing device, comprising a support positioning plate and sealing skirts connected around the support positioning plate; the bottom of the support positioning plate has inclined chamfers around its perimeter, and the bottom and side surfaces of the support positioning plate are covered with high-temperature resistant composite fire extinguishing blankets; the support positioning plate has several pressure relief holes, the two ends of which penetrate the support positioning plate and the high-temperature resistant composite fire extinguishing blankets, and the interior of the pressure relief holes is equipped with adjustable pressure relief and fire-arresting structures for sealing the tank body and relieving high-pressure gas inside the tank; the bottom of the support positioning plate has several positioning components for connecting to the bottom of the liquefied gas tanker manhole. This invention is convenient to operate, safe and reliable, can automatically correct and accurately align, and can rapidly cool down, effectively suppressing the risk of explosion due to liquefied gas vaporization and pressure rise.

Description

Technical Field

[0001] This invention relates to the field of fire-fighting emergency equipment technology for the storage and transportation of hazardous chemicals, specifically a magnetically sealed rapid-cooling explosion-proof liquefied gas tanker manhole fire extinguishing device. Background Technology

[0002] During the transportation, loading, unloading, and maintenance of liquefied petroleum gas (LPG) tank trucks, aging or failure of the manhole seals on the top of the tank can easily lead to leakage of the medium and cause fires, which are difficult to handle and can easily lead to explosions. If the flames continue to burn the tank, the LPG inside will vaporize rapidly and the temperature and pressure will rise sharply, which may lead to the expansion of boiling liquid vapors and explosions, causing major safety accidents.

[0003] Currently, dry powder and foam are commonly used for fire extinguishing, but these methods can only suppress flames temporarily, cannot seal manholes, and have a high reignition rate. Fire blankets require close-range operation, which is risky and they can easily be blown away by internal pressure. Traditional fire extinguishing devices are mostly small and circular, requiring precise alignment, which is difficult in dense smoke and fire situations where time is of the essence, resulting in significant operational inconvenience. Moreover, they lack active cooling structures, which cannot effectively suppress the risk of liquefied gas vaporization and pressure rise leading to explosion. Conventional sealing devices also lack controllable pressure relief functions, which can easily lead to pressure buildup after complete sealing, further increasing the risk of explosion. Therefore, there is an urgent need to develop a magnetically sealed, rapid-cooling, explosion-proof liquefied gas tanker manhole fire extinguishing device, which is of great significance for improving the safety of emergency response to hazardous chemicals. Summary of the Invention

[0004] To address the problems existing in the prior art, the purpose of this invention is to provide a magnetically sealed, rapid-cooling, explosion-proof liquefied gas tanker manhole fire extinguishing device that is easy to operate, safe and reliable, capable of automatic alignment and precise positioning, and capable of rapid cooling to effectively suppress the risk of liquefied gas vaporization and pressure rise leading to explosion.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A magnetically sealed rapid-cooling explosion-proof liquefied gas tanker manhole fire extinguishing device includes a support positioning plate and a sealing skirt connected around the support positioning plate. The bottom of the positioning plate is chamfered around the perimeter, and the bottom and side surfaces of the positioning plate are covered with high-temperature resistant composite fire extinguishing blankets. The bearing positioning plate is equipped with several pressure relief holes. The two ends of the pressure relief holes pass through the bearing positioning plate and the high-temperature resistant composite fire extinguishing blanket. The pressure relief holes are equipped with an adjustable pressure relief and fire arresting structure, which is used to seal the tank and release the high-pressure gas in the tank. The bottom of the positioning plate is equipped with several positioning components for connecting to the bottom of the manhole of the liquefied gas tanker.

[0006] Furthermore, the bearing positioning plate has a hollow cavity structure, and a rapid cooling module is set inside the bearing positioning plate. The rapid cooling module includes a modified composite phase change heat absorption layer, a low-temperature refrigerant cooling rod, a micro atomizing spray unit, and a sealed cold storage cavity. The modified composite phase change heat absorption layer is attached to the inner side of the high-temperature resistant composite fire extinguishing blanket. The low-temperature refrigerant cooling rod extends through the sealed cold storage cavity into the tank body. The micro atomizing spray unit is used to atomize and spray low-temperature carbon dioxide to achieve triple rapid cooling and pressure suppression.

[0007] Furthermore, the exterior of the micro-atomizing spray unit is covered with a high-temperature resistant heat-insulating pad.

[0008] Furthermore, the bearing positioning disk is equipped with a high-temperature resistant permanent magnet array, which includes several samarium cobalt permanent magnets. The samarium cobalt permanent magnets are uniformly embedded in a ring on the outer side of the bottom of the bearing positioning disk. The bottom surface of the samarium cobalt permanent magnets is flush with the high-temperature resistant composite fire extinguishing blanket, and the outside is covered with a high-temperature resistant heat insulation pad.

[0009] Furthermore, a mating interface is fixedly connected to the center of the top surface of the positioning plate. The inner wall of the mating interface is provided with internal threads for connecting with the fire-fighting insulated telescopic rod, enabling remote blind deployment operation at a distance of 5m.

[0010] Furthermore, the bearing positioning plate is made of lightweight, high-strength, high-temperature resistant fiberglass, and the edges of the bearing positioning plate are rounded and blunted.

[0011] Furthermore, the tilt chamfer is 30°, which allows the bearing positioning plate to automatically slide and center when it is placed at an angle.

[0012] Furthermore, the high-temperature resistant composite fire extinguishing blanket is made of basalt fiber base coated with nano-fluororubber flame retardant coating. The high-temperature resistant composite fire extinguishing blanket is bonded and fixed to the outside and bottom of the bearing positioning plate, and the bottom of the high-temperature resistant composite fire extinguishing blanket is clamped between the bearing positioning plate and the inner wall of the manhole.

[0013] Furthermore, the adjustable pressure relief flame arrestor structure includes a limiting shaft, which is movably sleeved in the middle of the pressure relief hole. A metal wire mesh flame arrestor core is fixedly connected to the bottom of the limiting shaft. Several pressure relief through holes are opened inside the limiting shaft and are located on the outside of the metal wire mesh flame arrestor core. A pressure reducing ring is coaxially arranged above the limiting shaft. Several evenly distributed elastic pressure relief plates are clamped and connected between the pressure reducing ring and the limiting shaft. An adjusting plug is pressed and held at the top of the pressure reducing ring. The upper end of the adjusting plug passes through the pressure relief hole and extends to the top of the bearing positioning plate. The upper end of the adjusting plug is threaded into the upper end of the inner cavity of the pressure relief hole.

[0014] Furthermore, both the metal wire mesh flame arrestor core and the elastic pressure relief plate are made of stainless steel.

[0015] Furthermore, the sealing skirt is connected to the high-temperature resistant composite fire extinguishing blanket, and the sealing skirt and the high-temperature resistant composite fire extinguishing blanket are integrally formed structures. The lower end of the sealing skirt is fitted and connected to the tank body to form a secondary flexible seal.

[0016] Furthermore, the width of the sealing skirt is 60mm, and it slopes downwards at a 15° angle from the inside to the outside along the outer periphery of the bearing positioning plate surface.

[0017] Furthermore, the positioning component includes a positioning hook, a mounting bracket, and a linkage component disposed below the high-temperature resistant composite fire extinguishing blanket. The lower end of the positioning hook is fixedly connected to the bottom edge of the manhole, the upper end of the positioning hook is rotatably connected to the mounting bracket, the mounting bracket is detachably connected to the bearing positioning plate, and the top of the positioning hook is engaged with the linkage component.

[0018] Furthermore, the positioning hook includes a connecting block, a positioning body, and a toothed arc block. The connecting block is rotatably connected to the inner side of the mounting bracket, the positioning body is connected to the lower end of the connecting block, the positioning body is fixedly connected to the lower edge of the manhole, and the toothed arc block is set on the top of the connecting block and is adapted to the linkage component.

[0019] Furthermore, the toothed arc block and the connecting block are integrally formed structures, and the positioning body and the connecting block are integrally formed structures.

[0020] Furthermore, the linkage assembly includes a linkage sleeve, a piston, and a positioning plate. The linkage sleeve is slidably engaged with the bottom of the bearing positioning plate and the high-temperature resistant composite fire extinguishing blanket. The bottom of the linkage sleeve is meshed with the top of the toothed arc block. The piston is sealed inside the linkage sleeve. One side of the piston forms a sealed cavity filled with inert gas with the inside of the linkage sleeve. The other side is fixedly connected to one end of the positioning plate. The other end of the positioning plate passes through the linkage sleeve and is fixedly connected to the bottom of the bearing positioning plate and the high-temperature resistant composite fire extinguishing blanket.

[0021] In summary, the present invention has the following advantages: 1. The adjustable pressure relief flame arrestor structure of the present invention, in conjunction with the pressure relief hole, ensures a sealing effect on the tank body through the elastic holding force of the elastic pressure relief plate. When the pressure inside the tank is too high or even an explosion occurs, it can overcome the elastic force on its own, allowing the high-pressure gas inside the tank to be released through the adjustable pressure relief flame arrestor structure, thereby achieving the effect of pressure relief and explosion prevention. At the same time, the initial elastic pressure can be changed by adjusting the plug to adapt to the safety explosion-proof value of different tank bodies. 2. This invention effectively solves the problem of misalignment during blind operation by using a high-temperature resistant composite fire extinguishing blanket and a sealing skirt for extensive coverage, ensuring complete coverage and sealing even when the manhole is not visible; 3. The bearing positioning plate of the present invention is provided with an inclined chamfer, which, together with the annular magnetic array, achieves fault tolerance and anti-displacement. It can be automatically corrected when placed at an angle or offset, and slight displacement does not affect the sealing effect. 4. The interface of this invention is compatible with universal fire-fighting insulated telescopic poles, enabling remote blind deployment and effectively eliminating the risk of close-range heat radiation and explosion to personnel; 5. The rapid cooling module of the present invention achieves triple rapid cooling and pressure suppression, effectively suppressing the vaporization and pressure rise of liquefied gas, and reducing the risk of explosion from the source; 6. The positioning plate of this invention can cover the mainstream 400mm inner diameter manhole and 500mm outer diameter flange, and is compatible with all mainstream specifications of liquefied gas tank truck manholes. There is no need to modify the tank body or pre-installation, and a single person can quickly complete the disposal. 7. The positioning component and linkage component of the present invention cooperate to drive the positioning hook to automatically hook and tighten the bottom edge of the manhole under high temperature by the expansion of inert gas, effectively improving the sealing firmness. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the bottom structure of the present invention;

[0024] Figure 3 This is a front view of the structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the adjustable pressure relief flame arrestor structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the positioning component of the present invention;

[0027] Figure 6 This is a cross-sectional view of the positioning component of the present invention.

[0028] In the picture: 1-Bearing positioning plate; 2-High temperature resistant composite fire extinguishing blanket; 3-Sealing skirt; 4-Pressure relief hole; 5-Adjustable pressure relief fire arresting structure; 51-Limiting shaft; 52-Metal wire mesh fire arresting core; 53-Pressure relief through hole; 54-Reducing resistance ring; 55-Elastic pressure relief plate; 56-Adjusting plug; 6-Matching interface; 7-Positioning component; 71-Positioning hook; 711-Connecting block; 712-Positioning body; 713-Toothed arc block; 72-Mounting bracket; 73-Linkage component; 731-Linkage sleeve; 732-Piston; 733-Positioning plate. Detailed Implementation

[0029] The present invention will now be described in further detail.

[0030] like Figure 1 and Figure 2 As shown, a magnetically sealed rapid cooling explosion-proof liquefied gas tanker manhole fire extinguishing device includes a support positioning plate 1 and a sealing skirt 3 connected around the support positioning plate 1. The bottom of the positioning plate 1 is provided with inclined chamfers around its perimeter, and the bottom and side surfaces of the positioning plate 1 are covered with high-temperature resistant composite fire extinguishing blankets 2. The bearing positioning plate 1 is provided with several pressure relief holes 4. The two ends of the pressure relief holes 4 pass through the bearing positioning plate 1 and the high temperature resistant composite fire extinguishing blanket 2. The pressure relief holes 4 are provided with an adjustable pressure relief and fire arresting structure 5, which is used to seal the tank and release the high pressure gas in the tank. The bottom of the positioning plate 1 is provided with several positioning components 7 for connecting to the bottom of the manhole of the liquefied gas tanker.

[0031] In this embodiment, the fire extinguishing device is a square structure of 800mm×800mm. The bearing positioning plate 1 is provided with four pressure relief holes 4. Each pressure relief hole 4 is an independent φ6mm passage with a pressure relief threshold of 200~250kPa.

[0032] like Figure 1 and Figure 2 As shown, the supporting positioning plate 1 has a hollow cavity structure. Inside the supporting positioning plate 1 is a rapid cooling module, which includes a modified composite phase change heat-absorbing layer, a low-temperature refrigerant cooling rod, a micro-atomizing spray unit, and a sealed cold storage cavity. The modified composite phase change heat-absorbing layer is attached to the inner side of the high-temperature resistant composite fire blanket 2. The low-temperature refrigerant cooling rod extends through the sealed cold storage cavity into the tank. The micro-atomizing spray unit is used to atomize and spray low-temperature carbon dioxide, and is remotely triggered by a mechanical pull wire to achieve triple rapid cooling and pressure suppression. The micro-atomizing spray unit is externally covered with a high-temperature resistant heat-insulating gasket. Due to the setting of the rapid cooling module, triple rapid cooling is achieved, thereby effectively improving safety and suppressing the risk of explosion at its source.

[0033] like Figures 1 to 3 As shown, the supporting positioning disk 1 is equipped with a high-temperature resistant permanent magnet array, which includes several samarium cobalt permanent magnets. These samarium cobalt permanent magnets are uniformly embedded in a ring on the outer bottom of the supporting positioning disk 1. The bottom surface of the samarium cobalt permanent magnets is flush with the high-temperature resistant composite fire blanket 2, and is covered with a high-temperature resistant heat insulation pad. In this embodiment, the high-temperature resistant permanent magnet array includes twelve samarium cobalt permanent magnets, with a total adsorption force of not less than 2400N. A mating interface 6 is fixedly connected to the center of the top surface of the supporting positioning disk 1. The inner wall of the mating interface 6 is provided with an M20 internal thread for connecting with a fire-fighting insulating telescopic rod, enabling remote blind deployment operation from 5m away, effectively eliminating the risk of close-range heat radiation and explosion for personnel.

[0034] The bearing positioning disk 1 is made of lightweight, high-strength, and high-temperature resistant fiberglass, with rounded corners on its edges. The chamfer is 30°, which, under its guiding effect, achieves fault tolerance and anti-displacement properties. When the bearing positioning disk 1 is placed at an angle, in conjunction with the high-temperature resistant permanent magnet array, the chamfer allows it to automatically slide and center itself.

[0035] Due to the large-size bearing positioning plate 1 and its inclined chamfered bottom, it can fully cover the current mainstream 400mm inner diameter manholes and 500mm outer diameter flanges. Moreover, with the cooperation of the high-temperature resistant composite fire extinguishing blanket 2 and the sealing skirt 3, the sealing performance is ensured, thereby effectively improving the applicability of the equipment. Furthermore, since it does not require precise alignment and is easy to deploy, it can be adapted to all mainstream specifications of liquefied gas tanker manholes. There is no need to modify the tank body or pre-installation, and a single person can quickly complete the disposal.

[0036] like Figure 1 and Figure 2 As shown, the high-temperature resistant composite fire blanket 2 is made of basalt fiber substrate coated with a nano-fluororubber flame-retardant coating, which can achieve short-term temperature resistance ≥1200℃ and long-term working temperature resistance 600~700℃. The high-temperature resistant composite fire blanket 2 is bonded and fixed to the outside and bottom of the bearing positioning plate 1, and the bottom of the high-temperature resistant composite fire blanket 2 is clamped between the bearing positioning plate 1 and the inner wall of the manhole.

[0037] like Figures 1 to 3 As shown, the sealing skirt 3 is connected to the high-temperature resistant composite fire extinguishing blanket 2. The sealing skirt 3 and the high-temperature resistant composite fire extinguishing blanket 2 are integrally formed. The width of the sealing skirt 3 is 60mm. It is inclined downwards from the inside to the outside at 15° along the outer periphery of the bearing positioning plate 1. The lower end of the sealing skirt 3 is attached to the upper surface of the tank to form a secondary flexible seal.

[0038] Due to the high-temperature resistant composite fire extinguishing blanket 2 and the sealing skirt 3, the combination of the two enables blind operation and large coverage, effectively reducing the problem of misalignment during blind operation. Furthermore, with the large-area sealing skirt 3, it ensures that even if the manhole is not visible, it can still achieve complete coverage and sealing.

[0039] like Figures 1 to 4 The adjustable pressure relief flame arrestor structure 5 includes a limiting shaft 51, which is movably sleeved inside the pressure relief hole 4. A metal wire mesh flame arrestor core 52 is fixedly connected to the bottom of the limiting shaft 51, and the lower end of the metal wire mesh flame arrestor core 52 is sleeved at the bottom of the inner cavity of the pressure relief hole 4. Several pressure relief through holes 53 are opened inside the limiting shaft 51, and the pressure relief through holes 53 are located on the outside of the metal wire mesh flame arrestor core 52. A pressure reducing ring 54 is coaxially arranged above the limiting shaft 51, and several evenly distributed elastic pressure relief plates 55 are clamped and connected between the pressure reducing ring 54 and the limiting shaft 51. Preferably, the metal wire mesh flame arrestor core 52 and the elastic pressure relief plates 55 are both made of stainless steel. An adjusting plug 56 is pressed and held at the top of the pressure reducing ring 54. The upper end of the adjusting plug 56 penetrates the pressure relief hole 4 and extends to the top of the bearing positioning plate 1. The upper end of the adjusting plug 56 is threadedly sleeved at the upper end of the inner cavity of the pressure relief hole 4.

[0040] Due to the adjustable pressure relief and flame arrestor structure 5, in conjunction with the pressure relief hole 4, the elastic holding force of the elastic pressure relief plate 55 allows the metal wire mesh flame arrestor core 52 to seal the lower end of the pressure relief hole 4, ensuring the sealing effect on the tank. When the pressure inside the tank is too high or even an explosion occurs, it is easy to overcome the elastic force of the elastic pressure relief plate 55, causing the metal wire mesh flame arrestor core 52 to move away from the lower end of the pressure relief hole 4, thereby facilitating the discharge of high-pressure gas inside the tank through the adjustable pressure relief and flame arrestor structure 5 and the pressure relief hole 4, achieving the effect of pressure relief and explosion prevention. Furthermore, the initial position of the resistance reducing ring 54 and the upper end of the elastic pressure relief plate 55 can be adjusted by adjusting the plug 56, thereby changing the initial elastic pressure of the elastic pressure relief plate 55 to adapt to different tank pressure safety explosion-proof values, thus improving the applicability range.

[0041] like Figures 1 to 6 As shown, the positioning component 7 includes a positioning hook 71, a mounting bracket 72, and a linkage component 73 disposed below the high-temperature resistant composite fire extinguishing blanket 2. The lower end of the positioning hook 72 is fixedly connected to the bottom edge of the manhole, the upper end of the positioning hook 71 is rotatably connected to the mounting bracket 72, the mounting bracket 72 is detachably connected to the bearing positioning plate 1, and the top of the positioning hook 71 is engaged with the linkage component 73.

[0042] The positioning hook 71 includes a connecting block 711, a positioning body 712, and a toothed arc block 713. The connecting block 711 is rotatably connected to the inner side of the mounting bracket 72. The positioning body 712 is connected to the lower end of the connecting block 711 and is fixedly connected to the lower edge of the manhole. The toothed arc block 713 is disposed on the top of the connecting block 711 and is adapted to the linkage component 73. The toothed arc block 713 and the connecting block 711 are integrally formed structures, and the positioning body 712 and the connecting block 711 are integrally formed structures.

[0043] The linkage assembly 73 includes a linkage sleeve 731, a piston 732, and a positioning plate 733. The linkage sleeve 731 is slidably engaged with the bottom of the bearing positioning plate 1 and the high-temperature resistant composite fire extinguishing blanket 2. The bottom of the linkage sleeve 731 is engaged with the top of the toothed arc block 713. The piston 732 is sealed inside the linkage sleeve 731. One side of the piston 732 forms a sealed cavity filled with inert gas with the inside of the linkage sleeve 731, and the other side is fixedly connected to one end of the positioning plate 733. The other end of the positioning plate 733 passes through the linkage sleeve 731 and is fixedly connected to the bottom of the bearing positioning plate 1 and the high-temperature resistant composite fire extinguishing blanket 2.

[0044] Due to the positioning component 7, in conjunction with the linkage component 73, the gas expands after the positioning component 7 enters the high-temperature tank, causing the lower end of the positioning hook 71 to move closer to the bottom edge of the manhole until it finally hooks the bottom edge of the manhole, thereby improving the robustness of the equipment enclosure.

[0045] The working principle of this invention is as follows: In the event of a fire, the operator, from 5m away, uses the interface 6 and its upper threaded hole to blindly place the fire extinguishing device at the manhole on the top of the tank via a telescopic rod; then, under the combined action of the tilting chamfer and the magnetic array, it automatically grabs the steel plate and corrects its position, with the 800mm×800mm square surface completely covering the manhole, achieving stable adsorption and fixation.

[0046] At the same time, the lower ends of several positioning components 7 move down to below the bottom of the manhole inner wall. Then, under the action of high temperature, the gas in the linkage sleeve 731 expands and, under the restriction of the piston 732 and the positioning plate 733, pushes the linkage sleeve 731 to move laterally. Then, under the restriction of the mounting bracket 72, the linkage sleeve 731 drives the connecting block 711 and its lower positioning body 712 to swing away from the manhole axis through the toothed arc block 713 until the positioning body 712 touches the bottom edge of the manhole.

[0047] In addition, the high-temperature resistant composite fire blanket 2 and the sealing skirt 3 quickly form a complete seal, isolating air and suffocating the fire. Simultaneously, the rapid cooling module is activated, with the phase change layer instantly absorbing heat, the cooling rods continuously conducting cold, and the spray unit enhancing cooling, suppressing the rapid rise in temperature and pressure.

[0048] When the pressure inside the tank exceeds the standard, the pre-adjusted adjustable pressure relief and flame arrestor structure 5 automatically releases pressure and arrests the flame in a small amount, which not only avoids the danger of pressure buildup, but also does not damage the main seal, realizing integrated treatment of fire extinguishing, cooling, pressure suppression and explosion prevention throughout the process.

[0049] After the fire extinguishing and cooling process is completed, the gas inside the linkage sleeve 731 will shrink due to the decrease in temperature inside the tank. Then, under the restriction of the piston 732 and the positioning plate 733, the linkage sleeve 731 will move in the opposite direction, thereby causing the toothed arc block 713 to move away from the bottom of the manhole wall and finally detach. At this time, the equipment can be removed by overcoming the permanent magnet attraction force.

[0050] The main functions of this invention are: 1. The adjustable pressure relief flame arrestor structure 5 of the present invention, in conjunction with the pressure relief hole 4, ensures a sealing effect on the tank body through the elastic holding force of the elastic pressure relief plate 55. When the pressure inside the tank is too high or even an explosion occurs, it can overcome the elastic force on its own, allowing the high-pressure gas inside the tank to be released through the adjustable pressure relief flame arrestor structure 5, thereby achieving the effect of pressure relief and explosion prevention. At the same time, the initial elastic pressure can be changed by adjusting the plug 56 to adapt to the safety explosion-proof value of different tank bodies. 2. This invention effectively solves the problem of misalignment during blind operation by using a high-temperature resistant composite fire extinguishing blanket 2 and a sealing skirt 3 to cover a large area, ensuring that the manhole can be completely covered and sealed even if it is not visible. 3. The bearing positioning disk 1 of the present invention is provided with an inclined chamfer, which, together with the annular magnetic array, achieves fault tolerance and anti-displacement. It can be automatically corrected when placed at an angle or off-center, and slight displacement does not affect the sealing effect. 4. The interface 6 of this invention is compatible with universal fire-fighting insulated telescopic poles, enabling remote blind deployment and effectively eliminating the risk of close-range heat radiation and explosion for personnel; 5. The rapid cooling module of the present invention achieves triple rapid cooling and pressure suppression, effectively suppressing the vaporization and pressure rise of liquefied gas, and reducing the risk of explosion from the source; 6. The positioning plate 1 of this invention can cover the mainstream 400mm inner diameter manhole and 500mm outer diameter flange, and is compatible with all mainstream specifications of liquefied gas tank truck manholes. There is no need to modify the tank body or pre-installation, and a single person can quickly complete the disposal. 7. The positioning component 7 of the present invention works in conjunction with the linkage component 73. Under high temperature, the expansion of inert gas drives the positioning hook 71 to automatically hook and tighten the bottom edge of the manhole, effectively improving the sealing firmness.

[0051] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A magnetically sealed, rapid-cooling, explosion-proof liquefied gas tanker manhole fire extinguishing device, characterized in that: Includes a support positioning plate and a sealing skirt connected around the support positioning plate; The bottom of the positioning plate is chamfered around the perimeter, and the bottom and side surfaces of the positioning plate are covered with high-temperature resistant composite fire extinguishing blankets. The bearing positioning plate is equipped with several pressure relief holes. The two ends of the pressure relief holes pass through the bearing positioning plate and the high-temperature resistant composite fire extinguishing blanket. The pressure relief holes are equipped with an adjustable pressure relief and fire arresting structure, which is used to seal the tank and release the high-pressure gas in the tank. The bottom of the positioning plate is equipped with several positioning components for connecting to the bottom of the manhole of the liquefied gas tanker.

2. The magnetically sealed rapid-cooling explosion-proof liquefied gas tanker manhole fire extinguishing device according to claim 1, characterized in that: The bearing positioning plate has a hollow cavity structure. The bearing positioning plate is equipped with a rapid cooling module. The rapid cooling module includes a modified composite phase change heat absorption layer, a low-temperature refrigerant cooling rod, a micro atomizing spray unit, and a sealed cold storage cavity. The modified composite phase change heat absorption layer is attached to the inner side of the high-temperature resistant composite fire extinguishing blanket. The low-temperature refrigerant cooling rod extends through the sealed cold storage cavity into the tank. The micro atomizing spray unit is used to atomize and spray low-temperature carbon dioxide.

3. The magnetically sealed rapid-cooling explosion-proof liquefied gas tanker manhole fire extinguishing device according to claim 2, characterized in that: The bearing positioning plate is equipped with a high-temperature resistant permanent magnet array, which includes several samarium cobalt permanent magnets. The samarium cobalt permanent magnets are uniformly embedded in a ring on the outer side of the bottom of the bearing positioning plate. The bottom surface of the samarium cobalt permanent magnets is flush with the high-temperature resistant composite fire extinguishing blanket, and the outside is covered with a high-temperature resistant heat insulation pad.

4. The magnetically sealed rapid-cooling explosion-proof liquefied gas tanker manhole fire extinguishing device according to claim 3, characterized in that: The top surface of the positioning plate is fixedly connected to a mating interface, and the inner wall of the mating interface is provided with internal threads for connecting with the fire-fighting insulating telescopic rod.

5. The magnetically sealed rapid-cooling explosion-proof liquefied gas tanker manhole fire extinguishing device according to claim 1, characterized in that: The high-temperature resistant composite fire extinguishing blanket is made of basalt fiber base coated with nano-fluororubber flame retardant coating. The high-temperature resistant composite fire extinguishing blanket is bonded and fixed to the outside and bottom of the bearing positioning plate, and the bottom of the high-temperature resistant composite fire extinguishing blanket is clamped between the bearing positioning plate and the inner wall of the manhole.

6. The magnetically sealed rapid-cooling explosion-proof liquefied gas tanker manhole fire extinguishing device according to claim 1, characterized in that: The adjustable pressure relief flame arrestor structure includes a limiting shaft, which is movably sleeved inside the pressure relief hole. A metal wire mesh flame arrestor core is fixedly connected to the bottom of the limiting shaft. Several pressure relief through holes are opened inside the limiting shaft and are located on the outside of the metal wire mesh flame arrestor core. A pressure reducing ring is coaxially arranged above the limiting shaft. Several evenly distributed elastic pressure relief plates are clamped and connected between the pressure reducing ring and the limiting shaft. An adjusting plug is pressed on the top of the pressure reducing ring. The upper end of the adjusting plug passes through the pressure relief hole and extends to the top of the bearing positioning plate. The upper end of the adjusting plug is threaded into the upper end of the inner cavity of the pressure relief hole.

7. A magnetically sealed, rapid-cooling, explosion-proof liquefied gas tanker manhole fire extinguishing device according to claim 1, characterized in that: The sealing skirt is connected to the high-temperature resistant composite fire extinguishing blanket. The sealing skirt and the high-temperature resistant composite fire extinguishing blanket are integrally formed. The lower end of the sealing skirt is fitted and connected to the tank body to form a secondary flexible seal.

8. A magnetically sealed, rapid-cooling, explosion-proof liquefied gas tanker manhole fire extinguishing device according to claim 1, characterized in that: The positioning assembly includes a positioning hook, a mounting bracket, and a linkage assembly located below the high-temperature resistant composite fire extinguishing blanket. The lower end of the positioning hook is fixedly connected to the bottom edge of the manhole, the upper end of the positioning hook is rotatably connected to the mounting bracket, the mounting bracket is detachably connected to the bearing positioning plate, and the top of the positioning hook is engaged with the linkage assembly.

9. A magnetically sealed, rapid-cooling, explosion-proof liquefied gas tanker manhole fire extinguishing device according to claim 8, characterized in that: The positioning hook includes a connecting block, a positioning body, and a toothed arc block. The connecting block is rotatably connected to the inside of the mounting bracket, the positioning body is connected to the lower end of the connecting block, the positioning body is fixedly connected to the lower edge of the manhole, and the toothed arc block is set on the top of the connecting block and is adapted to the linkage component.

10. A magnetically sealed, rapid-cooling, explosion-proof liquefied gas tanker manhole fire extinguishing device according to claim 9, characterized in that: The linkage assembly includes a linkage sleeve, a piston, and a positioning plate. The linkage sleeve is slidably engaged with the bottom of the bearing positioning plate and the high-temperature resistant composite fire extinguishing blanket. The bottom of the linkage sleeve is engaged with the top of the toothed arc block. The piston is sealed inside the linkage sleeve. One side of the piston forms a sealed cavity filled with inert gas with the inside of the linkage sleeve. The other side is fixedly connected to one end of the positioning plate. The other end of the positioning plate passes through the linkage sleeve and is fixedly connected to the bottom of the bearing positioning plate and the high-temperature resistant composite fire extinguishing blanket.

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