An explosion-proof civil defense door

Abstract

The present invention belongs to the field of civil air defense engineering, specifically an explosion-proof civil air defense door, comprising a door body and a door frame; a buffer chamber one and a buffer chamber two are fixedly installed in the door body; a cavity is formed between the buffer chamber one and the buffer chamber two; a buffer cylinder is fixedly installed in the cavity; an airway is provided in the buffer cylinder; a buffer plug is slidably installed in the airway; a strong magnetic fast is embedded in the buffer plug; a door sealing groove is provided on the contact surface between the door body and the door frame; a rubber ring is fixedly installed in the door sealing groove; expandable graphite is mixed in the rubber ring material; the rubber ring is hollow inside, and a pipe is fixedly connected to the hollow part of the rubber ring; the internal space of the rubber ring is connected with the buffer chamber one and the buffer chamber two through the pipe; the present invention has a simple structure, and the civil air defense door can effectively weaken the impact force generated by the explosion while ensuring the sealing effect of the civil air defense door.

Description

Technical Field

[0001] The invention belongs to the field of civil air defense engineering, in particular to an explosion-proof civil air defense door. Background Art

[0002] Civil defense doors are the doors at the entrances and exits of people's defense projects. Civil defense doors are clearly classified, including ordinary single-leaf and double-leaf protective closed doors and closed doors, movable threshold single-leaf and double-leaf protective closed doors and closed doors. Most of the existing civil defense doors are protective doors with a layer of hard steel plates. Among the many types of civil defense doors, reinforced concrete civil defense doors are widely used, with simple structures, and are mostly used to prevent high-intensity impacts. The impact resistance effect when impacted is poor. The impact force generated by the explosion can easily damage the civil defense door, resulting in a decrease in the protection effect of the civil defense door.

[0003] There are also some technical solutions in the prior art, such as the Chinese patent with application number CN201911011357.9, which includes a door body and a plurality of steel balls filled inside the door body. The gaps between the steel balls are filled with metal solution. After the metal solution solidifies, the plurality of steel balls are connected into a whole. When the door body is impacted by an explosion, the steel balls inside the door body are deformed to release the force of the explosion. The door body is provided with a frame, and a circle of gas storage boxes are fixedly connected to the inner surface of the frame. A sealing ring is provided on the frame. When an explosion occurs, the gas storage box is deformed to squeeze the internal gas into the sealing ring, which is The door seal is used to seal, but because the hollow steel balls added to the door body are spherical and filled with condensed metal around the steel balls, when the impact force of the explosion hits the door body, the surface of the steel balls is evenly stressed and the internal gas cannot be discharged, resulting in the steel balls being difficult to deform, affecting the door body's force release effect against the explosion. At the same time, the gas storage box will rebound after deformation, resulting in the sealing ring being unable to maintain a good expansion state, affecting the sealing effect of the civil air defense door. The high temperature generated by the explosion will also burn the sealing ring, causing damage to the sealing ring, and the protective effect of the civil air defense door cannot be achieved. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art and solve the problems that civil air defense doors are difficult to release force generated by explosion impacts and that the door body is difficult to seal after being deformed, the present invention proposes an explosion-proof civil air defense door.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an explosion-proof civil air defense door described in the present invention comprises a door body and a door frame; the door frame is fixedly installed on the wall; the door body is inside the door frame and is rotatably connected to the door frame; the door body is a steel structure wrapped with steel plates; a buffer cavity 1 and a buffer cavity 2 are fixedly installed in the door body; the buffer cavity 1 and the buffer cavity 2 are symmetrically distributed in the door body; there is a cavity between the buffer cavity 1 and the buffer cavity 2; the thickness of the steel plate at the corresponding area of ​​the cavity is less than the thickness at other positions; a buffer cylinder is fixedly installed in the cavity; the buffer cylinder is evenly distributed in the cavity; one end of the buffer cylinder is fixed on the side wall of the buffer cavity 1 located in the cavity; the other end of the buffer cylinder is fixed on the side wall of the buffer cavity 2 located in the cavity; an airway is opened inside the buffer cylinder; the buffer cavity 1 and the buffer cavity 2 are connected through the airway;

[0006] During operation, the door body and the door frame are rotated to form a closed state. When an explosion occurs on the left side of the door body as shown in the figure, the door body is impacted by the explosion. Since the steel plate is thinner at one part of the buffer chamber, the steel plate at one part of the buffer chamber is depressed by the impact of the explosion, thereby releasing the impact force of the explosion, reducing the force of the impact force generated by the explosion on the frame around the door body, and avoiding deformation or fragmentation of the main frame of the door body. At the same time, the gas inside the buffer chamber 1 is compressed, and the air pressure inside the buffer chamber 1 increases rapidly. The air in the buffer chamber 1 will enter the airway in the buffer cylinder. When the gas passes through the airway 6, it is subject to the friction of the inner wall of the airway 6. The friction reduces the flow rate and impact force of the gas, and reduces the impact of the impact force generated by the explosion on the explosion-proof door. After passing through the airway, the gas enters the buffer chamber 2. Since the internal air pressure of the buffer chamber 2 is greater than the external atmospheric pressure, and the thickness of the steel plate corresponding to the buffer chamber 2 is thinner, the steel plate corresponding to the buffer chamber 2 is convex, which further releases the impact force of the explosion and relieves the internal pressure of the door body, thereby ensuring the explosion-proof effect of the civil air defense door.

[0007] Preferably, the airway includes a straight airway and a spherical airway; the straight airway and the spherical airway in the airway are alternately connected, and both ends of the airway are straight airways; the radius of the spherical airway is greater than the radius of the straight airway, and the length of the spherical airway is greater than the length of the straight airway; a sliding rod is fixedly installed in the cavity; one end of the sliding rod is fixedly installed on the side wall of the cavity close to buffer cavity one; the other end of the sliding rod is fixedly installed on the side wall of the cavity close to buffer cavity two; the central axis of the sliding rod coincides with the central axis of the straight airway; baffles are fixedly installed at both ends of the sliding rod; the baffle is located at a position close to the straight airway inside the spherical airway; a buffer plug is slidably installed on the sliding rod; the buffer plug is cylindrical, and the central axis of the buffer plug coincides with the central axis of the sliding rod; the length of the buffer plug is less than the length of the straight airway; the radius of the buffer plug is equal to the radius of the straight airway, and the buffer plug generates friction with the inner wall of the straight airway;

[0008] During operation, the gas in buffer chamber one enters the airway in the buffer cylinder. At the same time, the air pressure on the left side of the buffer plug is greater than that on the right side. Under the action of air pressure, the buffer plug slides to the right on the slide rod. When the buffer plug slides into the straight airway, it has sliding friction with the inner wall of the straight airway, and the energy of the gas in buffer chamber one is converted into internal energy through friction, thereby further weakening the impact force generated by the explosion. When the buffer plug passes through the spherical airway, the gas directly enters buffer chamber two through the gap between the buffer plug and the spherical airway, rapidly reducing the air pressure in buffer chamber one and preventing the internal pressure of buffer chamber one from being too high, thereby preventing the cavity from bursting. At the same time, when the gas passes through the spherical airway, it is subject to the friction resistance of the inner wall of the spherical airway, thereby further reducing the energy of the gas and reducing the impact on the main frame of the door body.

[0009] Preferably, the surface material of the buffer plug is polytetrafluoroethylene; a strong magnetic block is embedded inside the buffer plug; the strong magnetic block is cylindrical and the two ends of the cylinder are its two magnetic poles;

[0010] During operation, under the action of gas pressure, the buffer plug slides on the slide rod. When passing through the straight airway, the buffer plug generates friction with the inner wall of the straight airway. At the same time, the polytetrafluoroethylene material on the surface of the buffer plug ensures sliding friction between the buffer plug and the inner wall of the straight airway to prevent excessive friction from blocking the straight airway. At the same time, when the buffer plug slides in the airway, the steel body of the side wall of the buffer cylinder cuts the magnetic flux lines of the strong magnetic block inside the buffer plug, and an induced current is generated in the steel body of the side wall of the buffer cylinder. According to Lenz's law, the buffer plug is subjected to the Ampere force in the opposite direction of the movement of the buffer plug, which further relieves the impact force of the explosion. At the same time, the work done by the Ampere force further consumes the energy generated by the explosion, reducing the impact of the explosion on the main frame of the door body.

[0011] Preferably, a door sealing groove is provided on the side of the door body that contacts the door frame; a rubber ring is fixedly installed in the door sealing groove; the surface of the rubber ring fits the surface of the door sealing groove; the inside of the rubber ring is hollow; a pipe is fixedly connected to the buffer chamber 1 and the buffer chamber 2; the other end of the pipe is fixedly connected to the rubber ring; the space in the rubber ring is in communication with the pipe; a check valve is fixedly installed in the pipe;

[0012] During operation, under the action of the depression and extrusion of the steel plate, the air pressure inside the buffer chamber one is greater than the air pressure inside the rubber ring, the gas in the buffer chamber one enters the space inside the rubber ring through the pipeline, the air pressure inside the rubber ring is greater than the external atmospheric pressure, the rubber ring expands, and the expanded rubber ring fits tightly with the door frame to achieve a sealing effect and block harmful gases. At the same time, the gas in the buffer chamber one enters the buffer chamber two through the airway, the air pressure inside the buffer chamber two is greater than the air pressure inside the rubber ring, and the gas in the buffer chamber two enters the space inside the rubber ring through the pipeline, further increasing the internal air pressure of the rubber ring, increasing the expansion of the rubber ring, and strengthening the sealing effect of the rubber ring on the door body and the door frame, ensuring that when the door body is slightly deformed by the impact of the explosion, a good seal is maintained between the door body and the door frame to prevent harmful gases generated by the explosion from entering the other side through the gap, thereby ensuring the protective effect of the civil air defense door. At the same time, the setting of the check valve in the pipeline ensures that the internal air pressure of the rubber ring is maintained at the maximum air pressure state, ensuring that the rubber ring is always in the best sealing state when an explosion occurs, thereby preventing harmful gas leakage.

[0013] Preferably, an inorganic flame retardant is added to the rubber ring; expandable graphite is added to the rubber ring; the proportion of the expandable graphite in the rubber ring is 40-45wt%;

[0014] During operation, the explosion generates a large amount of heat and is accompanied by a fire. The rubber ring is burned. The addition of inorganic flame retardants in the rubber ring material slows down the damage rate of the rubber ring under the burning of the flame and ensures the sealing effect of the rubber ring. The main body of the rubber ring material is rubber, which ensures good toughness and prevents the rubber ring from rupturing when inflated. At the same time, the high temperature causes the expandable graphite in the rubber ring material to expand, thereby enhancing the sealing effect of the rubber ring. At the same time, when the rubber ring is ruptured due to long-term intense burning, the addition of expandable graphite can still make the rubber ring expand, thereby ensuring the sealing effect of the rubber ring, preventing the invasion of harmful gases, and ensuring the protective effect of the civil air defense door.

[0015] Preferably, the space in the cavity is filled with fireproof and soundproof cotton;

[0016] During operation, the explosion generates intense heat and noise. The setting of the fireproof and soundproof cotton in the cavity enhances the fireproof and heat-insulating effect of the door body and reduces the temperature increase on the other side of the civil air defense door. At the same time, the fireproof and soundproof cotton blocks the sound and reduces the harm of noise to the human body.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. An explosion-proof civil air defense door described in the present invention is provided with a buffer chamber 1, a buffer cylinder, an air duct, a buffer plug and a buffer chamber 2. First, a steel plate in the buffer chamber is recessed to release the impact force of the explosion. Then, the gas in the buffer chamber 1 is compressed and enters the air duct in the buffer cylinder. The buffer plug in the buffer cylinder moves under the pressure of the gas in the air duct. The moving buffer plug is subjected to friction and Ampere force in the air duct. The friction and Ampere force do work to further reduce the energy of the gas. Finally, the gas enters the buffer chamber 2, and the impact force is released through the convexity of the steel plate corresponding to the buffer chamber 2, which greatly reduces the impact force generated by the explosion, thereby achieving the explosion-proof effect of the civil air defense door.

[0019] 2. An explosion-proof civil air defense door described in the present invention is provided with a rubber ring and a pipe. First, the steel plate corresponding to buffer chamber one is dented under the impact of the explosion, and the internal air pressure of buffer chamber one increases. The gas in buffer chamber one enters buffer chamber two after being buffered by the buffer tube, thereby increasing the air pressure in buffer chamber two. At the same time, the gas in buffer chambers one and two enters the hollow part of the rubber ring through the pipe, and the rubber ring expands to achieve a sealing effect. Then, the check valve arranged in the pipe keeps the rubber ring in an expanded state, thereby maintaining the seal between the door body and the door frame. Finally, when the rubber ring is broken due to long-term flame burning, the expandable graphite added to the rubber ring material expands rapidly under the action of high temperature, thereby ensuring the sealing effect between the door body and the door frame in the event of an explosion or fire, and effectively preventing harmful gases from penetrating the explosion-proof civil air defense door. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a front view of the present invention;

[0022] Figure 2 yes Figure 1 A partial enlarged view of the middle part;

[0023] Figure 3 yes Figure 1 A partial enlarged view of point B in the middle;

[0024] Figure 4 yes Figure 2 A partial enlarged view of point C in the middle;

[0025] In the figure: door body 1, steel plate 11, door sealing groove 12, rubber ring 13, pipe 14, cavity 15, door frame 2, buffer cavity 1 3, buffer cavity 2 4, buffer cylinder 5, airway 6, straight airway 61, spherical airway 62, sliding rod 7, baffle 71, buffer plug 8. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0027] like Figures 1 to 4 As shown, an explosion-proof civil air defense door described in the present invention comprises a door body 1 and a door frame 2; the door frame 2 is fixedly mounted on the wall; the door body 1 is inside the door frame 2 and is rotatably connected to the door frame 2; the door body 1 is a steel structure wrapped with a steel plate 11; a buffer cavity 1 3 and a buffer cavity 2 4 are fixedly mounted inside the door body 1; the buffer cavity 1 3 and the buffer cavity 2 4 are symmetrically distributed inside the door body 1; there is a cavity 15 between the buffer cavity 1 3 and the buffer cavity 2 4; the thickness of the steel plate 11 at the corresponding area of ​​the cavity 15 is less than the thickness at other positions; a buffer cylinder 5 is fixedly mounted inside the cavity 15; the buffer cylinder 5 is evenly distributed in the cavity 15; one end of the buffer cylinder 5 is fixed on the side wall of the buffer cavity 1 3 located inside the cavity 15; the other end of the buffer cylinder 5 is fixed on the side wall of the buffer cavity 2 4 located inside the cavity 15; an airway 6 is opened inside the buffer cylinder 5; the buffer cavity 1 3 and the buffer cavity 2 4 are connected through the airway 6;

[0028] When working, the rotating door body 1 and the door frame 2 form a closed state. Figure 1 When an explosion occurs on the left side of the door body as shown, the door body is impacted by the explosion. Since the steel plate 11 is thinner at the buffer chamber 3, the steel plate 11 at the buffer chamber 3 is dented by the impact of the explosion, thereby releasing the impact force of the explosion, reducing the force of the impact force generated by the explosion on the frame around the door body 1, and preventing the main frame of the door body 1 from deforming or breaking. At the same time, the gas inside the buffer chamber 3 is compressed, and the air pressure inside the buffer chamber 3 increases rapidly. The air in the buffer chamber 3 will enter the airway 6 in the buffer cylinder 5. When the gas passes through the airway 6, it is subject to the friction of the inner wall of the airway 6. The friction reduces the flow rate and impact force of the gas, and reduces the impact of the impact force generated by the explosion on the explosion-proof door. After passing through the airway 6, the gas enters the buffer chamber 2 4. Since the air pressure inside the buffer chamber 2 4 is greater than the external atmospheric pressure, and the thickness of the steel plate 11 corresponding to the buffer chamber 2 4 is thin, the steel plate 11 corresponding to the buffer chamber 2 4 is convex, which further releases the impact force of the explosion, and relieves the internal pressure of the door body 1, thereby ensuring the explosion-proof effect of the civil air defense door.

[0029] As an embodiment of the present invention, the airway 6 includes a straight airway 61 and a spherical airway 62; the straight airway 61 and the spherical airway 62 in the airway 6 are alternately connected, and both ends of the airway 6 are straight airways 61; the radius of the spherical airway 62 is greater than the radius of the straight airway 61, and the length of the spherical airway 62 is greater than the length of the straight airway 61; a slide bar 7 is fixedly installed in the cavity 15; one end of the slide bar 7 is fixedly installed on the side wall of the cavity 15 close to the buffer cavity 3; the other end of the slide bar 7 is fixedly installed in the cavity 15 close to the buffer cavity 3. On the side wall of the punching cavity 2 4; the central axis of the slide bar 7 coincides with the central axis of the straight airway 61; baffles 71 are fixedly installed at both ends of the slide bar 7; the baffle 71 is located inside the spherical airway 62 near the straight airway 61; a buffer plug 8 is slidably installed on the slide bar 7; the buffer plug 8 is cylindrical, and the central axis of the buffer plug 8 coincides with the central axis of the slide bar 7; the length of the buffer plug 8 is less than the length of the straight airway 61; the radius of the buffer plug 8 is equal to the radius of the straight airway 61, and the buffer plug 8 generates friction with the inner wall of the straight airway 61;

[0030] During operation, the gas in the buffer chamber 3 enters the airway 6 in the buffer tube 5. At the same time, the air pressure on the left side of the buffer plug 8 is greater than that on the right side. Under the action of the air pressure, the buffer plug 8 slides to the right on the slide rod 7. When the buffer plug slides into the straight airway 61, it rubs against the inner wall of the straight airway 61, and converts the energy of the gas in the buffer chamber 3 into internal energy through friction, further weakening the impact force generated by the explosion. When the buffer plug 8 passes through the spherical airway 62, the gas directly enters the buffer chamber 4 through the gap between the buffer plug 8 and the spherical airway 62, quickly reducing the air pressure in the buffer chamber 3 and preventing the internal pressure of the buffer chamber 3 from being too high, causing the cavity to burst. At the same time, when the gas passes through the spherical airway 62, it is subject to the friction resistance of the inner wall of the spherical airway 62, further reducing the energy of the gas and reducing the impact on the main frame of the door body 1.

[0031] As an embodiment of the present invention, the surface material of the buffer plug 8 is polytetrafluoroethylene; a strong magnetic block is embedded inside the buffer plug 8; the strong magnetic block is cylindrical and the two ends of the cylinder are its two magnetic poles;

[0032] During operation, under the action of gas pressure, the buffer plug 8 slides on the slide rod 7. When passing through the straight airway 61, the buffer plug 8 generates friction with the inner wall of the straight airway 61. At the same time, the polytetrafluoroethylene material on the surface of the buffer plug 8 ensures that the buffer plug 8 generates sliding friction with the inner wall of the straight airway 61, thereby preventing the buffer plug 8 from blocking the straight airway 61 due to excessive friction. At the same time, when the buffer plug 8 slides in the airway 6, the steel body of the side wall of the buffer cylinder 5 cuts the magnetic flux lines of the strong magnetic block inside the buffer plug 8, and an induced current is generated in the steel body of the side wall of the buffer cylinder 5. According to Lenz's law, the buffer plug 8 is subjected to the Ampere force in the opposite direction of the movement of the buffer plug 8, thereby further relieving the impact force of the explosion. At the same time, the work done by the Ampere force further consumes the energy generated by the explosion, thereby reducing the impact of the explosion on the main frame of the door body 1.

[0033] As an embodiment of the present invention, a door sealing groove 12 is provided on the side of the door body 1 that contacts the door frame 2; a rubber ring 13 is fixedly installed in the door sealing groove 12; the surface of the rubber ring 13 is in contact with the surface of the door sealing groove 12; the rubber ring 13 is hollow inside; a pipe 14 is fixedly connected to the buffer chamber 1 3 and the buffer chamber 2 4; the other end of the pipe 14 is fixedly connected to the rubber ring 13; the space in the rubber ring 13 is in communication with the pipe 14; a check valve is fixedly installed in the pipe 14;

[0034] During operation, under the effect of the depression and extrusion of the steel plate 11, the air pressure inside the buffer chamber 13 is greater than the air pressure inside the rubber ring 13, and the gas inside the buffer chamber 13 enters the space inside the rubber ring 13 through the pipe 14. The air pressure inside the rubber ring 13 is greater than the external atmospheric pressure, and the rubber ring 13 expands. The expanded rubber ring 13 fits tightly with the door frame 2 to achieve a sealing effect and block harmful gases. At the same time, the gas in the buffer chamber 13 enters the buffer chamber 24 through the airway 6. The air pressure inside the buffer chamber 24 is greater than the air pressure inside the rubber ring 13, and the gas in the buffer chamber 24 enters the rubber ring 13 through the pipe 14. The space inside further increases the internal air pressure of the rubber ring 13, increases the expansion of the rubber ring 13, and strengthens the sealing effect of the rubber ring on the door body 1 and the door frame 2, ensuring that when the door body 1 is slightly deformed by the impact of the explosion, the door body 1 and the door frame 2 maintain a good seal, preventing harmful gases produced by the explosion from entering the other side through the gap, thereby ensuring the protective effect of the civil air defense door. At the same time, the setting of the check valve in the pipeline 14 ensures that the internal air pressure of the rubber ring 13 is maintained at the maximum air pressure state, ensuring that the rubber ring 13 is always in the best sealing state when an explosion occurs, thereby preventing harmful gases from leaking.

[0035] As an embodiment of the present invention, the rubber ring 13 is added with an inorganic flame retardant; the rubber ring 13 is added with expandable graphite; the proportion of the expandable graphite in the rubber ring 13 is 40-45wt%;

[0036] During operation, the explosion generates a large amount of heat and is accompanied by a fire, and the rubber ring 13 is burned. The addition of inorganic flame retardants in the material of the rubber ring 13 slows down the damage rate of the rubber ring 13 under the burning of the flame, thereby ensuring the sealing effect of the rubber ring 13. The main body of the material of the rubber ring 13 is rubber, which ensures good toughness and prevents the rubber ring 13 from rupturing when inflated. At the same time, the high temperature causes the expandable graphite in the material of the rubber ring 13 to expand, thereby enhancing the sealing effect of the rubber ring 13. At the same time, when the rubber ring 13 is ruptured due to long-term intense burning, the addition of expandable graphite can still make the rubber ring 13 expand, thereby ensuring the sealing effect of the rubber ring 13, preventing the invasion of harmful gases, and ensuring the protective effect of the civil air defense door.

[0037] As an embodiment of the present invention, the space in the cavity 15 is filled with fireproof and soundproof cotton;

[0038] During operation, the explosion generates intense heat and sound. The setting of the fireproof and soundproof cotton in the cavity 15 enhances the fireproof and heat-insulating effect of the door body 1 and reduces the temperature increase on the other side of the civil air defense door. At the same time, the fireproof and soundproof cotton blocks the sound and reduces the harm of noise to the human body.

[0039] The specific workflow is as follows:

[0040] When working, the rotating door body 1 and the door frame 2 form a closed state. Figure 1When an explosion occurs on the left side of the door body as shown, the door body is impacted by the explosion. Since the steel plate 11 is thinner at the buffer cavity 3, the steel plate 11 at the buffer cavity 3 is dented by the impact of the explosion. At the same time, the gas inside the buffer cavity 3 is compressed, and the air pressure inside the buffer cavity 3 increases rapidly. The air in the buffer cavity 3 will enter the airway 6 in the buffer cylinder 5. After the gas is subjected to the friction force of the inner wall of the airway 6 in the airway 6, the impact force and flow rate of the gas are reduced. After passing through the airway 6, the gas enters the buffer cavity 2 4. Since the air pressure inside the buffer cavity 2 4 is greater than the external atmospheric pressure, and the thickness of the steel plate 11 corresponding to the buffer cavity 2 4 is thinner, the steel plate 11 corresponding to the buffer cavity 2 4 is convex, and the gas in the buffer cavity 3 enters In the airway 6 in the buffer cylinder 5, at the same time, the air pressure on the left side of the buffer plug 8 is greater than the air pressure on the right side, and the buffer plug 8 slides to the right on the slide bar 7. When the buffer plug slides into the straight airway 61, it has sliding friction with the inner wall of the straight airway 61. When the buffer plug 8 passes through the spherical airway 62, the gas directly enters the buffer chamber 24 through the gap between the buffer plug 8 and the spherical airway 62. At the same time, under the action of the gas pressure, the buffer plug 8 slides on the slide bar 7. When passing through the straight airway 61, the buffer plug 8 has friction with the inner wall of the straight airway 61. The polytetrafluoroethylene material on the surface of the buffer plug 8 ensures that the buffer plug 8 has sliding friction with the inner wall of the straight airway 61. At the same time, when the buffer plug 8 slides in the airway 6, the steel body of the side wall of the buffer cylinder 5 cuts the buffer The magnetic flux lines of the strong magnetic block inside the plug 8 cause the buffer plug to generate an Ampere force in the opposite direction of the movement of the buffer plug 8. At the same time, under the action of the depression and extrusion of the steel plate 11, the air pressure inside the buffer cavity 3 is greater than the air pressure inside the rubber ring 13. The gas in the buffer cavity 3 enters the space inside the rubber ring 13 through the pipe 14. The air pressure inside the rubber ring 13 is greater than the external atmospheric pressure. The rubber ring 13 expands. The expanded rubber ring 13 fits tightly with the door frame 2. The gas in the buffer cavity 3 enters the buffer cavity 24 through the airway 6. The air pressure inside the buffer cavity 24 is greater than the air pressure inside the rubber ring 13. The gas in the buffer cavity 24 enters the space inside the rubber ring 13 through the pipe 14, increasing the expansion of the rubber ring 13. At the same time, the pipe 14 The setting of the check valve ensures that the internal air pressure of the rubber ring 13 is maintained at the maximum air pressure state. At the same time, the explosion generates a large amount of heat and is accompanied by fire. The rubber ring 13 is burned. The addition of inorganic flame retardant in the material of the rubber ring 13 slows down the damage rate of the rubber ring 13 under the burning of the flame. The main material of the rubber ring 13 is rubber, which ensures good toughness. The high temperature causes the expandable graphite in the material of the rubber ring 13 to expand. At the same time, when the rubber ring is ruptured due to long-term intense burning, the addition of expandable graphite can still make the rubber ring 13 expand. The explosion generates intense heat and sound. The setting of the fireproof and soundproof cotton in the cavity 15 enhances the fireproof and heat-insulating effect of the door body 1. At the same time, the fireproof and soundproof cotton blocks the sound.

[0041] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An explosion-proof civil air defense door, characterized in that : comprising a door body (1) and a door frame (2); the door frame (2) is fixedly mounted on a wall; the door body (1) is inside the door frame (2) and is rotatably connected to the door frame (2); the door body (1) is a steel structure wrapped with a steel plate (11); a buffer cavity 1 (3) and a buffer cavity 2 (4) are fixedly mounted inside the door body (1); the buffer cavity 1 (3) and the buffer cavity 2 (4) are symmetrically distributed inside the door body (1); a cavity (15) is between the buffer cavity 1 (3) and the buffer cavity 2 (4); the steel plate (11) is disposed in the cavity (15); 5) The thickness at the corresponding area is smaller than the thickness at other positions: a buffer cylinder (5) is fixedly installed in the cavity (15); the buffer cylinder (5) is evenly distributed in the cavity (15); one end of the buffer cylinder (5) is fixed on the side wall of the buffer cavity 1 (3) located in the cavity (15); the other end of the buffer cylinder (5) is fixed on the side wall of the buffer cavity 2 (4) located in the cavity (15); an airway (6) is opened inside the buffer cylinder (5); the buffer cavity 1 (3) and the buffer cavity 2 (4) are connected through the airway (6); The airway (6) comprises a straight airway (61) and a spherical airway (62); the straight airway (61) and the spherical airway (62) in the airway (6) are alternately connected, and both ends of the airway (6) are straight airways (61); the radius of the spherical airway (62) is greater than the radius of the straight airway (61), and the length of the spherical airway (62) is greater than the length of the straight airway (61); a sliding rod (7) is fixedly installed in the cavity (15); one end of the sliding rod (7) is fixedly installed on the side of the cavity (15) close to the buffer cavity (3); On the wall: the other end of the slide bar (7) is fixedly mounted on the side wall of the cavity (15) near the second buffer cavity (4); the central axis of the slide bar (7) coincides with the central axis of the straight airway (61); baffles (71) are fixedly mounted on both ends of the slide bar (7); the baffles (71) are located at a position near the straight airway (61) inside the spherical airway (62); a buffer plug (8) is slidably mounted on the slide bar (7); the buffer plug (8) is cylindrical, and the central axis of the buffer plug (8) coincides with the central axis of the slide bar (7); the length of the buffer plug (8) is less than the length of the straight airway (61); the radius of the buffer plug (8) is equal to the radius of the straight airway (61), and the buffer plug (8) generates friction with the inner wall of the straight airway (61); A door sealing groove (12) is provided on the side of the door body (1) that contacts the door frame (2); a rubber ring (13) is fixedly installed in the door sealing groove (12); the rubber ring (13) does not contact the door frame (2); the rubber ring (13) is hollow inside; a pipe (14) is fixedly connected to the buffer chamber 1 (3) and the buffer chamber 2 (4); the other end of the pipe (14) is fixedly connected to the rubber ring (13); the space inside the rubber ring (13) and the pipe (14) are in communication with each other; a check valve is fixedly installed in the pipe (14); The surface material of the buffer plug (8) is polytetrafluoroethylene; a strong magnetic block is embedded inside the buffer plug (8); the strong magnetic block is cylindrical and has two magnetic poles at both ends of the cylinder. When the buffer plug (8) slides in the airway (6), the steel body of the side wall of the buffer cylinder (5) cuts the magnetic flux lines of the strong magnetic block inside the buffer plug (8); During operation, under the effect of the depression and squeezing of the steel plate (11), the internal air pressure of the buffer chamber (3) is greater than the internal air pressure of the rubber ring (13), the gas in the buffer chamber (3) enters the space inside the rubber ring (13) through the pipe (14), the internal air pressure of the rubber ring (13) is greater than the external atmospheric pressure, the rubber ring (13) expands, and the expanded rubber ring (13) fits tightly with the door frame (2), achieving a sealing effect and blocking harmful gases. At the same time, the gas in the buffer chamber (3) enters the buffer chamber (3) through the air passage (6). The air pressure inside the punching cavity (4) and the buffer cavity (4) is greater than the air pressure inside the rubber ring (13). The gas in the buffer cavity (4) enters the space inside the rubber ring (13) through the pipe (14), further increasing the internal air pressure of the rubber ring (13), increasing the expansion of the rubber ring (13), and strengthening the sealing effect of the rubber ring on the door body (1) and the door frame (2), thereby ensuring that when the door body (1) is slightly deformed due to the impact of the explosion, a good seal is maintained between the door body (1) and the door frame (2).

2. According to claim 1, an explosion-proof civil air defense door is characterized in that : An inorganic flame retardant is added to the rubber ring (13); expandable graphite is added to the rubber ring (13); the proportion of the expandable graphite in the rubber ring (13) is 40-45wt%.

3. According to claim 1, the explosion-proof civil air defense door is characterized in that The space inside the cavity (15) is filled with fireproof and soundproof cotton.

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