A shock wave damping ventilation duct

Abstract

This invention discloses a shock wave damping ventilation duct, relating to the field of shock wave damping technology. It includes a ventilation duct assembly and a control assembly. The ventilation duct assembly includes a first ventilation duct, a second ventilation duct, an inner tube, and aluminum foam. The first ventilation duct connects to the second ventilation duct, and the inner wall of the inner tube is slidably connected to the first ventilation duct. Aluminum foam is respectively installed on the inner walls of the second ventilation duct and the inner tube. The control assembly includes a fixed tube and a movable rod. One end of the fixed tube is fixedly connected to the inner wall of the first ventilation duct, and the other end of the fixed tube is slidably connected to the movable rod, which is fixedly connected to the inner tube. The movable rod drives the inner tube to slide from the inner wall of the first ventilation duct to the position of the second ventilation duct, blocking the connection between the second and first ventilation ducts, thereby isolating the first and second ventilation ducts and preventing the shock wave generated by an explosion from propagating along the duct and damaging the equipment installed on the duct, thus providing protection.

Description

Technical Field

[0001] This invention relates to the field of shock wave damping technology, and in particular to a shock wave damping ventilation duct. Background Technology

[0002] In underground protective engineering projects, explosion-proof rooms are typically included. These rooms can be broadly categorized into two types: supply air rooms and exhaust air rooms. Supply air rooms are where personnel live and work, such as command centers, offices, rest rooms, and conference rooms. They have high air hygiene standards and require the supply of fresh air or air treated by air conditioning to maintain a certain temperature and humidity. Exhaust air rooms are rooms that continuously generate odors or harmful substances, such as toilets, kitchens, reservoirs, washrooms, sewage pump rooms, and battery rooms. To prevent harmful gases from spreading from exhaust air rooms to other rooms, used air from supply air rooms is systematically exhausted outside the project through these exhaust air rooms. The ventilation and air conditioning system of a protective engineering project consists of an air intake system, an exhaust system, an air conditioning supply system, and a return air system. The air intake system delivers fresh air from outside the project to meet the breathing needs of personnel and the requirements of equipment.

[0003] Currently, the fans, filters, or air conditioners in the existing air supply and exhaust rooms are directly connected through pipes. When an explosive is encountered outside the protective structure, the shock wave generated by the explosion will propagate along the pipes, damaging the equipment installed on the pipes and affecting its use. Therefore, it is necessary to dampen the shock wave inside the pipes to improve the protection of the equipment installed on the pipes. Summary of the Invention

[0004] The technical problem to be solved by this invention is that the fans, filters or air conditioners in the existing air supply room and exhaust room are directly connected through pipes. When an explosive is encountered outside the protective project, the shock wave generated by the explosion will propagate along the pipes, damaging the equipment installed on the pipes and affecting its use.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a shock wave damping ventilation duct, comprising a ventilation duct assembly and a control assembly. The ventilation duct assembly includes a first ventilation duct, a second ventilation duct, an inner tube, and aluminum foam. The first ventilation duct is connected to the second ventilation duct. The inner wall of the inner tube is slidably connected to the first ventilation duct. The inner walls of the second ventilation duct and the inner tube are respectively provided with aluminum foam. The control assembly includes a fixed tube and a movable rod. One end of the fixed tube is fixedly connected to the inner wall of the first ventilation duct, and the inner wall of the other end of the fixed tube is slidably connected to the movable rod. The movable rod is fixedly connected to the inner tube.

[0006] As a preferred embodiment of the shock wave damping ventilation duct of the present invention, the control component further includes a control element, which includes a hollow ring, an air inlet pipe, a fixed cylinder, a limiting shaft, a first piston head, and a fixed column. One end of the fixed column is fixedly connected to a movable rod, and the other end of the fixed column is fixedly connected to the first piston head. The first piston head is slidably connected to the inner wall of the fixed pipe. The fixed column is provided with an insertion hole. The hollow ring is fixedly connected to the top of the fixed pipe. One end of the air inlet pipe is connected to the hollow ring. The fixed cylinder is fixedly connected to the fixed pipe. The fixed cylinder is provided with a first through hole. The inner wall of the fixed cylinder is slidably connected to the limiting shaft, which is provided with a corresponding insertion hole. The limiting shaft is hollow inside and is provided with a second through hole.

[0007] As a preferred embodiment of the shock wave damping ventilation duct of the present invention, the control component further includes a locking member, which includes a first fixed ring, a second fixed ring, a limiting cylinder, and a movable tube. The first fixed ring and the second fixed ring are respectively fixedly connected to the inner wall of the fixed cylinder, the limiting shaft is fixedly connected to the limiting cylinder, and the movable tube is slidably connected to the inner wall of the limiting cylinder.

[0008] As a preferred embodiment of the shock wave damping ventilation duct of the present invention, the control component further includes a driving component, which includes a motor, a lead screw, a fixed shaft, and a second piston head. The motor is connected to one end of the lead screw, the lead screw is threaded to the fixed shaft, the fixed shaft has an inner cavity, a limiting shaft is fixedly connected to the outer wall of the fixed shaft, and the end of the lead screw away from the motor is fixedly connected to the second piston head, which is slidably connected to the inner wall of the inner cavity.

[0009] As a preferred embodiment of the shock wave damping ventilation duct of the present invention, the inner cavity is connected to the limiting cylinder through a third through hole.

[0010] As a preferred embodiment of the shock wave damping ventilation duct of the present invention, wherein: a spring is provided inside the limiting cylinder, one end of the spring is fixedly connected to a third piston head, the third piston head is slidably connected to the inner wall of the limiting cylinder, and the third piston head is fixedly connected to the movable pipe.

[0011] As a preferred embodiment of the shock wave damping ventilation duct of the present invention, wherein: the limiting shaft is fixedly connected to the sliding rod, and the sliding rod passes through the fixed cylinder.

[0012] As a preferred embodiment of the shock wave damping ventilation duct of the present invention, the motor is fixedly connected to the motor base, and the motor base is fixedly connected to the fixing cylinder.

[0013] In a preferred embodiment of the shock wave damping ventilation duct of the present invention, the inner wall of the first fixing ring is fixedly connected to the first sealing ring, and the inner wall of the first sealing ring is slidably connected to the limiting shaft; the inner wall of the second fixing ring is fixedly connected to the second sealing ring, and the inner wall of the second sealing ring is slidably connected to the limiting shaft.

[0014] As a preferred embodiment of the shock wave damping ventilation duct of the present invention, the fixed pipe is provided with an air outlet.

[0015] The beneficial effects of this invention are as follows: By controlling the movable rod to slide and extend within the inner wall of the fixed pipe, the movable rod drives the inner pipe to slide from the inner wall of the first ventilation pipe to the position of the second ventilation pipe, thus blocking the connection between the second ventilation pipe and the first ventilation pipe, thereby isolating the first and second ventilation pipes and preventing the shock wave generated by the explosion from propagating along the pipe and damaging the equipment installed on the pipe, thus playing a protective role. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this disclosure.

[0017] Figure 2 This is a schematic diagram of the control component structure in an embodiment of this disclosure.

[0018] Figure 3 This is a cross-sectional view of the fixed tube in an embodiment of this disclosure.

[0019] Figure 4 This is a schematic diagram of the fixed column structure in an embodiment of this disclosure.

[0020] Figure 5 This is a cross-sectional view of the fixed cylinder in an embodiment of this disclosure.

[0021] Figure 6 For the embodiments of this disclosure Figure 5 Enlarged diagram of point A in the middle.

[0022] Figure 7 This is a sectional view of the limiting shaft in an embodiment of this disclosure.

[0023] Figure 8 This is a cross-sectional view of the limiting cylinder in an embodiment of this disclosure.

[0024] Reference numerals: Ventilation pipe assembly 1, first ventilation pipe 11, second ventilation pipe 12, inner pipe 13, aluminum foam 14, control assembly 2, fixed pipe 21, air outlet 211, movable rod 22, control component 23, hollow ring 231, air inlet pipe 232, fixed cylinder 233, first through hole 2331, limiting shaft 234, second through hole 2341, first piston head 235, fixed column 236, insertion hole 2361, locking component 24, first fixed ring 241, first sealing ring 2411, second fixed ring 242, second sealing ring 2421, limiting cylinder 243, spring 2431, third piston head 2432, movable pipe 244, drive component 25, motor 251, lead screw 252, fixed shaft 253, inner cavity 2531, third through hole 2532, second piston head 254. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] Example 1

[0027] Reference Figure 1 and Figure 2 This embodiment provides a shock wave damping ventilation duct, which includes a ventilation duct assembly 1 and a control assembly 2. The ventilation duct assembly 1 includes a first ventilation duct 11, a second ventilation duct 12, an inner tube 13, and aluminum foam 14. The first ventilation duct 11 is connected to the second ventilation duct 12. The inner wall of the inner tube 13 is slidably connected to the first ventilation duct 11. The inner walls of the second ventilation duct 12 and the inner tube 13 are respectively provided with aluminum foam 14.

[0028] In this preferred embodiment, the aluminum foam 14 on the inner wall of the second ventilation duct 12 and the inner duct 13 can dampen the impact force generated by the explosion. The inner duct 13 can slide inside the first ventilation duct 11. When the protective structure receives an early warning, the inner duct 13 slides to the position of the second ventilation duct 12, blocking the connection between the second ventilation duct 12 and the first ventilation duct 11, thereby isolating the first ventilation duct 11 and the second ventilation duct 12. Furthermore, the aluminum foam 14 on the inner wall of the inner duct 13 can dampen the impact force generated by the explosion, preventing the shock wave generated by the explosion from propagating along the pipe and damaging the equipment installed on the pipe, thus providing protection.

[0029] The control component 2 includes a fixed tube 21 and a movable rod 22. One end of the fixed tube 21 is fixedly connected to the inner wall of the first ventilation tube 11, and the other end of the fixed tube 21 is slidably connected to the movable rod 22. The movable rod 22 is fixedly connected to the inner tube 13.

[0030] In this embodiment, preferably, the movable rod 22 can slide and extend on the inner wall of the fixed tube 21. When the movable rod 22 moves, it can drive the inner tube 13 to slide on the inner wall of the first ventilation tube 11. The fixed tube 21 and the movable rod 22 are provided as one or more sets, which is beneficial to make the sliding of the inner tube 13 more stable.

[0031] In use, by controlling the sliding extension and retraction of the movable rod 22 on the inner wall of the fixed pipe 21, the movable rod 22 drives the inner pipe 13 to slide from the inner wall of the first ventilation pipe 11 to the position of the second ventilation pipe 12, blocking the connection between the second ventilation pipe 12 and the first ventilation pipe 11, thereby isolating the first ventilation pipe 11 and the second ventilation pipe 12. Furthermore, the aluminum foam 14 on the inner wall of the inner pipe 13 can dampen the impact force generated by an explosion, preventing the shock wave from propagating along the pipe and damaging the equipment installed on the pipe, thus providing protection. Normally, the inner pipe 13... Figure 1In the middle position, normal ventilation can be carried out. If there is no time to close the first ventilation pipe 11 in case of an emergency, the foam aluminum 14 on the inner wall of the second ventilation pipe 12 and the inner pipe 13 can play a wave-damping role against the impact force generated by the explosion.

[0032] Example 2

[0033] Reference Figures 1 to 8 This embodiment is based on the previous embodiment, but differs from the previous embodiment in that...

[0034] Reference Figures 2 to 5 The control component 2 further includes a control element 23, which includes a hollow ring 231, an air intake pipe 232, a fixed cylinder 233, a limiting shaft 234, a first piston head 235, and a fixed post 236. One end of the fixed post 236 is fixedly connected to a movable rod 22, and the other end of the fixed post 236 is fixedly connected to the first piston head 235. The first piston head 235 is slidably connected to the inner wall of the fixed pipe 21. The fixed post 236 is provided with an insertion hole 2361. The hollow ring 231 is fixedly connected to the top of the fixed pipe 21. One end of the air intake pipe 232 is connected to the hollow ring 231. The fixed cylinder 233 is fixedly connected to the fixed pipe 21. The fixed cylinder 233 is provided with a first through hole 2331. The inner wall of the fixed cylinder 233 is slidably connected to the limiting shaft 234, which is provided corresponding to the insertion hole 2361. The limiting shaft 234 is hollow inside and is provided with a second through hole 2341.

[0035] Preferably, in this embodiment, the fixed post 236 connects the first piston head 235 and the movable rod 22, thus forming a single unit. When the first piston head 235 slides along the inner wall of the fixed tube 21, it can move the fixed post 236 and the movable rod 22. The insertion hole 2361 is larger than the limiting shaft 234. When the limiting shaft 234 is inserted into the insertion hole 2361, it locks the position of the fixed post 236, preventing movement of the fixed post 236, the first piston head 235, and the movable rod 22. The intake pipe 232 communicates with the interior of the hollow ring 231. The interior of the fixed cylinder 233 communicates with the interior of the hollow ring 231 through the first through hole 2331. The interior of the limiting shaft 234 communicates with the interior of the fixed cylinder 233 through the second through hole 2341, and the interior of the limiting shaft 234 communicates with the fixed tube 21.

[0036] First, the control limit shaft 234 is inserted into the insertion hole 2361. At this time, the fixed column 236, the first piston head 235 and the movable rod 22 cannot move. Then, the existing air pump is connected to the air inlet pipe 232, and the gas can be pumped into the air inlet pipe 232. Then, the gas passes through the hollow ring 231, the first through hole 2331, the fixed cylinder 233, the second through hole 2341 and the limit shaft 234 in sequence and enters the interior of the fixed pipe 21. In use, the control limit shaft 234 is pulled out from the insertion hole 2361. Under the action of the air pressure above the first piston head 235 inside the fixed tube 21, the first piston head 235 is quickly pushed downward. When the first piston head 235 slides on the inner wall of the fixed tube 21, it can drive the fixed column 236 and the movable rod 22 to move downward. The movable rod 22 retracts into the fixed tube 21. The movable rod 22 drives the inner tube 13 to slide on the inner wall of the first ventilation tube 11 to the position of the second ventilation tube 12, blocking the connection between the second ventilation tube 12 and the first ventilation tube 11, thereby isolating the first ventilation tube 11 and the second ventilation tube 12. In addition, the foam aluminum 14 on the inner wall of the inner tube 13 can play a wave-damping role against the impact force generated by the explosion, preventing the shock wave generated by the explosion from propagating along the pipe and damaging the equipment installed on the pipe, thus playing a protective role.

[0037] Reference Figure 5 The control component 2 further includes a locking member 24, which includes a first fixing ring 241, a second fixing ring 242, a limiting cylinder 243, and a movable tube 244. The first fixing ring 241 and the second fixing ring 242 are respectively fixedly connected to the inner wall of the fixing cylinder 233, the limiting shaft 234 is fixedly connected to the limiting cylinder 243, and the movable tube 244 is slidably connected to the inner wall of the limiting cylinder 243.

[0038] In this preferred embodiment, the first fixing ring 241 and the second fixing ring 242 can limit the movement of the limiting shaft 234, improving the stability of the limiting shaft 234 during movement. When the movable tube 244 inside the limiting cylinder 243 extends, it can be locked in place. Figure 5 To the left of the second fixing ring 242, the limiting shaft 234 cannot move. Figure 5 The right side of the second fixing ring 242 slides to prevent the limiting shaft 234 from being pulled out of the insertion hole 2361, thus avoiding accidental triggering.

[0039] Reference Figures 5 to 7 The control component 2 further includes a drive component 25, which includes a motor 251, a lead screw 252, a fixed shaft 253, and a second piston head 254. The motor 251 is connected to one end of the lead screw 252, the lead screw 252 is threadedly connected to the fixed shaft 253, the fixed shaft 253 has an inner cavity 2531, the outer wall of the fixed shaft 253 is fixedly connected to a limiting shaft 234, the end of the lead screw 252 away from the motor 251 is fixedly connected to the second piston head 254, and the second piston head 254 is slidably connected to the inner wall of the inner cavity 2531.

[0040] In this preferred embodiment, when the motor 251 is working, it can drive the lead screw 252 to rotate. The lead screw 252 can drive the fixed shaft 253 to move through the thread action. The fixed shaft 253 drives the limiting shaft 234 to move, inserting or pulling the limiting shaft 234 into or out of the insertion hole 2361. When the second piston head 254 approaches the limiting cylinder 243, the second piston head 254 compresses the gas inside the inner cavity 2531 and forces the gas into the limiting cylinder 243. At this time, the movable tube 244 extends out.

[0041] Reference Figure 7 The inner cavity 2531 is connected to the limiting cylinder 243 through the third through hole 2532.

[0042] In this preferred embodiment, when the second piston head 254 is close to the limiting cylinder 243, the second piston head 254 compresses the air pressure inside the inner cavity 2531, and the gas enters the limiting cylinder 243 through the third through hole 2532. The gas in the limiting cylinder 243 can also enter the inner cavity 2531 through the third through hole 2532.

[0043] Reference Figure 5 and Figure 8 The limiting cylinder 243 is provided with a spring 2431 inside. One end of the spring 2431 is fixedly connected to the third piston head 2432. The third piston head 2432 is slidably connected to the inner wall of the limiting cylinder 243 and is fixedly connected to the movable tube 244.

[0044] In this preferred embodiment, when the second piston head 254 approaches the limiting cylinder 243, the second piston head 254 compresses the gas inside the inner cavity 2531. The gas enters the limiting cylinder 243 through the third through hole 2532. Due to the tension of the spring 2431, the movable tube 244 does not immediately extend from the limiting cylinder 243. Only when the air pressure inside the inner cavity 2531 is greater than the tension of the spring 2431 will the movable tube 244 extend from the limiting cylinder 243, and the movable tube 244 will be stuck in the limiting cylinder 243. Figure 5 To the left of the second fixing ring 242, the limiting shaft 234 cannot move. Figure 5 The right side of the second fixing ring 242 slides to prevent the limiting shaft 234 from being pulled out of the insertion hole 2361, thus avoiding accidental triggering.

[0045] Reference Figure 5 and Figure 6 The limiting shaft 234 is fixedly connected to the slide rod 26, and the slide rod 26 passes through the fixed cylinder 233.

[0046] In this preferred embodiment, when the limiting shaft 234 moves, it drives the slide rod 26 to move. The slide rod 26 slides through the fixed cylinder 233. The slide rod 26 can limit the limiting shaft 234 and prevent relative rotation between the limiting shaft 234 and the fixed cylinder 233.

[0047] Reference Figure 6 The motor 251 is fixedly connected to the motor base, and the motor base is fixedly connected to the fixing cylinder 233.

[0048] In this preferred embodiment, the motor mount can fix the motor 251.

[0049] Reference Figure 5 The inner wall of the first fixing ring 241 is fixedly connected to the first sealing ring 2411, and the inner wall of the first sealing ring 2411 is slidably connected to the limiting shaft 234; the inner wall of the second fixing ring 242 is fixedly connected to the second sealing ring 2421, and the inner wall of the second sealing ring 2421 is slidably connected to the limiting shaft 234.

[0050] In this embodiment, the first sealing ring 2411 and the second sealing ring 2421 can seal the outer wall of the limiting shaft 234.

[0051] Reference Figure 2 The fixed tube 21 is provided with an air outlet 211.

[0052] In this preferred embodiment, when the first piston head 235 moves downward on the inner wall of the fixed tube 21, the first piston head 235 drives the fixed column 236 and the movable rod 22 to move downward. The movable rod 22 retracts into the fixed tube 21, and the vent 211 can release the gas below the first piston head 235 inside the fixed tube 21, making the first piston head 235 move downward more quickly, accelerating the speed of cutting off the first ventilation pipe 11 and the second ventilation pipe 12, and improving the protection capability of the equipment installed on the pipeline.

[0053] First, preset the settings and start the motor 251. The motor 251 drives the lead screw 252 to rotate forward, and the lead screw 252 drives the fixed shaft 253 to move. The fixed shaft 253 drives the limiting shaft 234 to move, inserting a part of the limiting shaft 234 into the insertion hole 2361. At this time, the second through hole 2341 is located to the right of the second fixed ring 242. At the same time, the second piston head 254 will also approach the position of the limiting cylinder 243. The second piston head 254 compresses the gas inside the inner cavity 2531. The gas enters the limiting cylinder 243 through the third through hole 2532. At this time, due to the tension of the spring 2431... When the force is applied, the movable tube 244 will not immediately extend from the limiting cylinder 243. At this time, the motor 251 can be turned off first. Since the limiting shaft 234 is inserted into the insertion hole 2361, the fixed column 236, the first piston head 235 and the movable rod 22 cannot move. Then, the existing air pump is connected to the air inlet pipe 232, and the gas can be pumped into the air inlet pipe 232. Then, the gas passes through the hollow ring 231, the first through hole 2331, the fixed cylinder 233, the second through hole 2341 and the limiting shaft 234 in sequence and enters the interior of the fixed tube 21. When the air pressure reaches the predetermined value, the air inlet pipe 232 is then closed.

[0054] Restarting motor 251 causes lead screw 252 to rotate forward, which in turn moves fixed shaft 253. Fixed shaft 253 then moves limiting shaft 234, inserting limiting shaft 234 into insertion hole 2361. At this point, the second through hole 2341 is located... Figure 5 Positioned between the first fixing ring 241 and the second fixing ring 242, the first sealing ring 2411 and the second sealing ring 2421 can seal the outer wall of the limiting shaft 234, preventing air in the second through hole 2341 from entering the fixing cylinder 233 on the right side of the second fixing ring 242, thus reducing the air pressure above the first piston head 235 inside the fixing tube 21. At this time, the second piston head 254 is closer to the limiting cylinder 243, and the second piston head 254 compresses the gas inside the inner cavity 2531, forcing the gas into the limiting cylinder 243. The air pressure inside the inner cavity 2531 is greater than the tension of the spring 2431, at which point the movable tube 244 extends. The movable tube 244 is located in... Figure 5 To the left of the second fixing ring 242, the limiting shaft 234 cannot move. Figure 5 The right side of the second fixing ring 242 slides to prevent the limiting shaft 234 from being pulled out of the insertion hole 2361, thus avoiding accidental triggering and completing the preset.

[0055] In use, the motor 251 is started, which drives the lead screw 252 to rotate in the opposite direction. At this time, the second piston head 254 moves away from the position of the limiting cylinder 243, and the air pressure inside the inner cavity 2531 is less than the tension of the spring 2431. At this time, the movable tube 244 retracts, and the movable tube 244 releases the lock on the position of the limiting shaft 234. The movable tube 244 can continue to move forward. Figure 5The second fixing ring 242 slides to the right until the limiting shaft 234 is pulled out of the insertion hole 2361. Under the action of the air pressure above the first piston head 235 inside the fixing tube 21, the first piston head 235 is quickly pushed downward. When the first piston head 235 slides on the inner wall of the fixing tube 21, it can drive the fixing column 236 and the movable rod 22 to move downward quickly. The movable rod 22 retracts into the fixing tube 21. The movable rod 22 drives the inner tube 13 to slide on the inner wall of the first ventilation tube 11 to the position of the second ventilation tube 12, blocking the connection between the second ventilation tube 12 and the first ventilation tube 11, thereby isolating the first ventilation tube 11 and the second ventilation tube 12. In addition, the foam aluminum 14 on the inner wall of the inner tube 13 can play a wave-damping role against the impact force generated by the explosion, preventing the shock wave generated by the explosion from propagating along the pipe and damaging the equipment installed on the pipe, thus playing a protective role.

[0056] By pre-introducing gas into the fixed tube 21, a micro motor can be used to retract the movable rod 22 into the fixed tube 21 during use. The micro motor only requires a small battery to meet the power requirements, thus blocking the connection between the second ventilation tube 12 and the first ventilation tube 11, thereby isolating the first ventilation tube 11 and the second ventilation tube 12. This not only improves the speed of isolating the second ventilation tube 12 and the first ventilation tube 11 and enhances the protective capability, but also reduces the layout of pipelines, allowing it to exist as an independent unit. This reduces the pipeline layout during use and the dependence on the surrounding environment. After pre-setting, it can still be used normally even when the external power is cut off, meeting the requirements of extreme wartime environments.

Claims

1. A shock wave damping ventilation duct, characterized in that: include Ventilation pipe assembly (1), the ventilation pipe assembly (1) includes a first ventilation pipe (11), a second ventilation pipe (12), an inner pipe (13) and aluminum foam (14), the first ventilation pipe (11) is connected to the second ventilation pipe (12), the inner wall of the inner pipe (13) is slidably connected to the first ventilation pipe (11), and the inner walls of the second ventilation pipe (12) and the inner pipe (13) are respectively provided with aluminum foam (14); The control component (2) includes a fixed tube (21), a movable rod (22), a control component (23), a locking component (24), and a driving component (25). One end of the fixed tube (21) is fixedly connected to the inner wall of the first ventilation tube (11), and the other end of the fixed tube (21) is slidably connected to the movable rod (22). The movable rod (22) is fixedly connected to the inner tube (13). The control component (23) includes a hollow ring (231), an intake pipe (232), a fixed cylinder (233), a limiting shaft (234), a first piston head (235), and a fixed post (236). One end of the fixed post (236) is fixedly connected to a movable rod (22), and the other end of the fixed post (236) is fixedly connected to the first piston head (235). The first piston head (235) is slidably connected to the inner wall of the fixed pipe (21). The fixed post (236) is provided with an insertion hole (2361). The ring (231) is fixedly connected to the top of the fixed tube (21), and one end of the air inlet pipe (232) is connected to the hollow ring (231). The fixed tube (21) is fixedly connected to the fixed cylinder (233), and the fixed cylinder (233) is provided with a first through hole (2331). The inner wall of the fixed cylinder (233) is slidably connected to the limiting shaft (234). The limiting shaft (234) is set with a corresponding insertion hole (2361). The limiting shaft (234) is hollow inside, and the limiting shaft (234) is provided with a second through hole (2341). The locking component (24) includes a first fixing ring (241), a second fixing ring (242), a limiting cylinder (243), and a movable tube (244). The first fixing ring (241) and the second fixing ring (242) are respectively fixedly connected to the inner wall of the fixing cylinder (233), the limiting shaft (234) is fixedly connected to the limiting cylinder (243), and the movable tube (244) is slidably connected to the inner wall of the limiting cylinder (243). The driving component (25) includes a motor (251), a lead screw (252), a fixed shaft (253), and a second piston head (254). The motor (251) is connected to one end of the lead screw (252), and the lead screw (252) is threadedly connected to the fixed shaft (253). The fixed shaft (253) has an inner cavity (2531) inside, and a limiting shaft (234) is fixedly connected to the outer wall of the fixed shaft (253). The end of the lead screw (252) away from the motor (251) is fixedly connected to the second piston head (254), and the second piston head (254) is slidably connected to the inner wall of the inner cavity (2531).

2. The shock wave damping ventilation duct as described in claim 1, characterized in that: The inner cavity (2531) is connected to the limiting cylinder (243) through the third through hole (2532).

3. The shock wave damping ventilation duct as described in claim 1, characterized in that: The limiting cylinder (243) is equipped with a spring (2431). One end of the spring (2431) is fixedly connected to the third piston head (2432). The third piston head (2432) is slidably connected to the inner wall of the limiting cylinder (243), and the third piston head (2432) is fixedly connected to the movable tube (244).

4. The shock wave damping ventilation duct as described in claim 1, characterized in that: The limiting shaft (234) is fixedly connected to the slide rod (26), and the slide rod (26) passes through the fixed cylinder (233).

5. The shock wave damping ventilation duct as described in claim 1, characterized in that: The motor (251) is fixedly connected to the motor base, and the motor base is fixedly connected to the fixing cylinder (233).

6. The shock wave damping ventilation duct as described in claim 1, characterized in that: The inner wall of the first fixing ring (241) is fixedly connected to the first sealing ring (2411), and the inner wall of the first sealing ring (2411) is slidably connected to the limiting shaft (234). The inner wall of the second fixing ring (242) is fixedly connected to the second sealing ring (2421), and the inner wall of the second sealing ring (2421) is slidably connected to the limiting shaft (234).

7. The shock wave damping ventilation duct as described in claim 1, characterized in that: The fixed tube (21) is provided with an air outlet (211).

Images