Mechanical pressurization smoke prevention and exhaust system

Abstract

The invention relates to the field of building fire fighting, in particular to a mechanical pressurization smoke prevention and exhaust system which comprises a plurality of sets of draught fans corresponding to all fire fighting areas in a building in a one-to-one mode, each set of draught fans comprises at least one exhaust fan and at least one air feeder, and a smoke exhaust pipe is communicated between an air inlet of each exhaust fan and the corresponding fire fighting area. An air supply pipe is communicated between the air outlet of each air feeder and the corresponding fire-fighting area, auxiliary pipes are communicated between the two smoke exhaust pipes and between the two air supply pipes of the two adjacent fire-fighting areas, and a smoke detector for detecting the smoke concentration and an air pressure sensor for detecting the air pressure are arranged in each fire-fighting area; the air feeder, the exhaust fan, the smoke detector and the air pressure sensor are all electrically connected with a controller, so that when the exhaust fan or the air feeder corresponding to one fire-fighting area is damaged, the exhaust fan or the air feeder corresponding to the adjacent fire-fighting area can improve the power, and the smoke prevention and exhaust effects in the corresponding fire-fighting area are not prone to being affected.

Description

Technical Field

[0001] The present application relates to the field of building fire protection, and in particular to a mechanical pressurized smoke exhaust system. Background Art

[0002] When a fire occurs in a building, a large amount of smoke is easily produced, which is mixed with a large amount of gases and small solid particles that are harmful to the human body. It is easy for people who inhale it to feel dizzy, affecting the chance of survival, and easily causing serious damage to the body.

[0003] Some buildings where many people gather, such as shopping malls, are equipped with mechanical pressurized smoke exhaust systems, that is, the air supply fan sends air outside the building to the evacuation passages and other smoke-proof areas in the building, so that the air pressure in the smoke-proof area is appropriately greater than the air pressure in other areas, so that smoke is not easy to enter the smoke-proof area. At the same time, the exhaust fan discharges the smoke in the building to the outside of the building. For example, a fire smoke exhaust fan control system with announcement number CN217107520U.

[0004] Regarding the above-mentioned related technologies, when the air supply fan or exhaust fan is damaged, resulting in a slow air supply and smoke exhaust speed or even failure to achieve gas flow, it will affect the smoke prevention and exhaust effects of various areas inside the building. Summary of the invention

[0005] In order to reduce the impact on the smoke prevention and exhaust effects of various areas inside the building, the present application provides a mechanical pressurized smoke prevention and exhaust system.

[0006] The present application provides a mechanical pressurized smoke exhaust system that adopts the following technical solution.

[0007] A mechanical pressurized smoke exhaust system includes an array of fans corresponding to each fire protection zone in a building, each group of fans includes at least one exhaust fan and at least one supply fan, a smoke exhaust pipe is connected between the air inlet of each exhaust fan and the corresponding fire protection zone, an air supply pipe is connected between the air outlet of each supply fan and the corresponding fire protection zone, an auxiliary pipe is connected between the two smoke exhaust pipes of two adjacent fire protection zones and between the two air supply pipes, a smoke detector for detecting smoke concentration and an air pressure sensor for detecting air pressure are provided in each fire protection zone, and the supply fan, exhaust fan, smoke detector and air pressure sensor are all electrically connected to a controller.

[0008] By adopting the above-mentioned technical solution, when a problem occurs in the air supply fan or exhaust fan corresponding to a fire protection area and the smoke prevention or exhaust requirements in the corresponding fire protection area cannot be met, the air supply fan or exhaust fan in the adjacent fire protection area can be turned on so that the corresponding fire protection area can normally carry out smoke prevention or exhaust, thereby reducing the impact on the smoke prevention or exhaust effect of each fire protection area.

[0009] Optionally, each of the smoke exhaust pipe and air supply pipe is rotatably connected to a changing plate, which can close the corresponding smoke exhaust pipe or air supply pipe. The changing plate can also close the corresponding auxiliary pipe, and the auxiliary pipe is provided with a changing motor that drives the changing plate to rotate and is electrically connected to the controller.

[0010] By adopting the above-mentioned technical solution, the channel changing plate can be rotated as needed, so that the exhaust fans and supply fans in different fire protection areas can better supply or extract air in different fire protection areas, thereby improving the smoke prevention and exhaust effects of different exhaust fans and supply fans in different fire protection areas.

[0011] Optionally, when the exhaust fan corresponding to the fire protection area where the smoke concentration exceeds the standard is No. N and is in operation for a predetermined period of time, and the smoke concentration detected by the smoke detector in the corresponding fire protection area is still in an elevated state, the switching plate in the No. N exhaust pipe corresponding to the No. N exhaust fan and the switching plate in the adjacent No. N+1 exhaust pipe rotate so that the No. N+1 exhaust fan is only connected to the No. N exhaust pipe, and the No. N+1 exhaust fan starts to operate; When exhaust fan No. N+1 is running and after a predetermined period of time, if the smoke concentration in the fire protection area still exceeds the standard, the switching plate in exhaust pipe No. N and the switching plate in the adjacent exhaust pipe No. N-1 rotate so that exhaust fan No. N-1 is only connected to exhaust pipe No. N, and exhaust fan No. N-1 starts to run.

[0012] By adopting the above technical solution, the two exhaust fans closest to the fire fighting area where the fire occurs are preferentially operated, and the smoke in the fire fighting area where the fire occurs is preferentially discharged in the most effective way.

[0013] Optionally, when the exhaust fan No. NM is running and after a predetermined period of time, if the smoke concentration in the fire protection area still exceeds the standard, the channel change plate in the No. N+M smoke exhaust pipe and the channel change plate in the adjacent No. N+M+1 smoke exhaust pipe rotate so that the No. N+M+1 exhaust fan is only connected to the No. N smoke exhaust pipe, and the No. N+M+1 exhaust fan starts to run, and M≥1; When exhaust fan No. N+M+1 is running and after a predetermined period of time, if the smoke concentration in the fire protection area still exceeds the standard, the changeover plate in exhaust pipe No. NM and the changeover plate in the adjacent exhaust pipe No. NM-1 rotate so that exhaust fan No. NM is only connected to exhaust pipe No. N, and exhaust fan No. NM-1 starts to run.

[0014] By adopting the above technical scheme, the number of operating exhaust fans can be gradually increased from near to far according to the smoke concentration in the fire fighting area where the fire occurs and the distance from the fire fighting area where the fire occurs, until the smoke concentration in the fire fighting area where the fire occurs begins to show a downward trend.

[0015] Optionally, when the smoke concentration detected by the smoke detector No. N corresponding to fire area No. N exceeds the smoke concentration threshold preset in the controller, the air blowers corresponding to the two fire areas No. N+1 and No. N-1 adjacent to fire area No. N will start operating.

[0016] By adopting the above technical solution, it is only necessary to increase the pressure in two adjacent fire protection areas within the fire protection area where the fire occurs to achieve a better smoke prevention effect.

[0017] Optionally, when the air pressure value in the fire protection area of ​​No. N+1 and / or No. N-1 has not reached the standard after the operation of the air supply fans No. N+1 and / or No. N-1 for a predetermined period of time, the switching plates of the air supply pipe No. N and the corresponding air supply pipes No. N+1 and / or No. N-1 are rotated so that the air supply fan No. N is only connected to the corresponding air supply pipes No. N+1 and / or No. N-1, and the air supply fan No. N starts to operate.

[0018] By adopting the above technical solution, the air supply fan corresponding to the fire-fighting area where the fire occurs is operated preferentially to assist in improving the smoke prevention effect.

[0019] Optionally, when the N blower is running and the air pressure value in the N+1 and / or N-1 fire protection area has not reached the standard after a predetermined period of time, the changing plates of the N+Z and / or N+1 air supply ducts or the changing plates of the NZ and / or N-1 air supply ducts rotate, so that the N+Z blower is only connected to the N+1 air supply duct and / or the NZ blower is only connected to the N-1 air supply duct, and the N+Z blower and / or the NZ blower starts to run, and Z≥2.

[0020] By adopting the above technical solution, the number of operating air fans is increased successively, and since the air pressure in the fire protection area requiring smoke prevention does not need to be increased to an excessive level to achieve smoke prevention, as long as one air supply fan can operate normally, the smoke prevention requirements in the corresponding fire protection area can be met.

[0021] Optionally, each of the channel changing plates is fixedly connected to a plate frame that fits tightly to the inner wall of the air supply pipe or the smoke exhaust pipe and can be elastically deformed.

[0022] By adopting the above technical solution, when the channel changing plate is needed to block the corresponding exhaust pipe or smoke exhaust pipe, it is difficult for gas to pass around the channel changing plate, thereby improving the corresponding smoke prevention and exhaust effects.

[0023] Optionally, the plate frame is located on the side of the channel changing plate facing the corresponding auxiliary pipe, and when the surface of the plate frame with an opening is in contact with the inner walls of the air supply pipe and the smoke exhaust pipe, the opening of the auxiliary pipe is opposite to the opening of the plate frame.

[0024] By adopting the above technical solution, the plate frame can better achieve the sealing of the auxiliary pipe.

[0025] Optionally, the two opposite surfaces of the plate frame in the direction of the rotation axis are both formed as arc surfaces.

[0026] By adopting the above technical solution, the arc surface of the plate frame can be squeezed and deformed more smoothly within the rotation range of 180°, and the sealing effect of the smoke exhaust pipe or the air supply pipe is not easily reduced.

[0027] In summary, the present application includes at least the following beneficial effects.

[0028] When a problem occurs with the air supply fan or exhaust fan corresponding to a fire protection area, making it impossible to meet the smoke prevention or exhaust requirements in the corresponding fire protection area, the air supply fan or exhaust fan in the adjacent fire protection area can be turned on so that the corresponding fire protection area can perform smoke prevention or exhaust normally, thereby reducing the impact on the smoke prevention or exhaust effects of each fire protection area. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This application only shows the floor plan corresponding to the three fire protection areas; Figure 2 It is a schematic diagram of the structure of the top view of the section of the upper part of the smoke exhaust pipe; Figure 3 It is the system block diagram of the control part of this application; Figure 4 It is a logic block diagram related to the operation of the exhaust fan of this application; Figure 5 It is a logic block diagram related to the operation of the blower of this application.

[0030] Explanation of the reference numerals: 1. fan; 2. exhaust fan; 3. supply fan; 4. exhaust pipe; 5. supply air pipe; 51. auxiliary pipe; 52. smoke detector; 53. air pressure sensor; 54. controller; 55. lane changing plate; 56. lane changing motor; 57. plate frame. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with the accompanying drawings.

[0032] The present application embodiment discloses a mechanical pressurized smoke exhaust system, referring to Figure 1 , including an array of fans 1, the interior of the building is divided into a row of several fire protection zones, and each group of fans 1 corresponds to a fire protection zone. Each group of fans 1 includes at least one exhaust fan 2 and at least one supply fan 3, and a smoke exhaust pipe 4 is connected between the air inlet of each exhaust fan 2 and the corresponding fire protection zone, and the air outlet of the exhaust fan 2 is connected to the outside of the building via a pipe. An air supply pipe 5 is connected between the air outlet of each supply fan 3 and the corresponding fire protection zone, and the air inlet of the supply fan 3 is connected to the outside of the building via a pipe, so that each fire protection zone can independently achieve smoke prevention and smoke exhaust.

[0033] Reference Figure 1 and Figure 2 An auxiliary pipe 51 is connected between two adjacent smoke exhaust pipes 4, and two openings of the smoke exhaust pipe 4 connected to the two auxiliary pipes 51 for connecting the auxiliary pipes 51 are staggered. A channel changing plate 55 is rotatably connected in the smoke exhaust pipe 4. One channel changing plate 55 is set in the two smoke exhaust pipes 4 that are farthest from each other, and two channel changing plates 55 are set in the remaining smoke exhaust pipes 4. The channel changing plate 55 can be fixedly connected with a plate frame 57 on the surface facing the auxiliary pipe 51. The plate frame 57 can be made of high-temperature resistant rubber such as silicone rubber, and the plate frame 57 fits the inner wall of the smoke exhaust pipe 4. The two opposite surfaces of the plate frame 57 in the direction of the rotation axis are formed into arc surfaces, so that the plate frame 57 can smoothly rotate 180° in the smoke exhaust pipe 4 while the plate frame 57 can also be tightly attached to the inner wall of the smoke exhaust pipe 4, and when the surface where the opening of the plate frame 57 is set fits the inner wall of the air supply pipe 5 and the smoke exhaust pipe 4, the opening of the auxiliary pipe 51 is opposite to the opening of the plate frame 57, so that the channel changing plate 55 can realize the connection and closure of each smoke exhaust pipe 4 and the connection and closure between the openings at both ends of each auxiliary pipe 51 and the corresponding smoke exhaust pipe 4. The smoke exhaust pipe 4 is detachably connected to a lane-changing motor 56 whose output shaft is coaxially detachably connected to the rotation point of the lane-changing plate 55. The corresponding auxiliary pipes 51, the lane-changing plate 55 and the lane-changing motor 56 are also arranged between the air supply pipes 5 in the same way.

[0034] Reference Figure 3 , a smoke detector 52 and an air pressure sensor 53 are installed in each fire protection area, and the smoke detector 52, the air pressure sensor 53, the exhaust fan 2, the air supply fan 3 and the lane changing motor 56 are all electrically connected to the controller 54. In addition, the fire protection areas are numbered from one end to the other as No. 1, No. 2...No. N, and the fire protection area No. N corresponds to the smoke detector No. 52, the air pressure sensor No. 53, the exhaust fan No. N, the air supply fan No. N, the lane changing motor 56, the smoke exhaust pipe No. N and the air supply pipe No. N. When a fire occurs, when the smoke concentration detected by the smoke detector No. 52 in the fire protection area No. N exceeds the fire threshold value preset by the controller 54, the exhaust fan No. N starts to run to exhaust the smoke in the fire protection area No. N. At the same time, the two air supply fans 3 No. N+1 and No. N-1 start to operate, so that the air outside the building is sent into the N+1 fire area and the N-1 fire area adjacent to the N fire area where the fire occurred, so that the smoke is not easy to flow from the N fire area to other fire areas, thereby achieving a smoke prevention effect.

[0035] Reference Figure 4, when the smoke concentration detected by the No. N smoke detector 52 exceeds the fire threshold, the No. N exhaust fan 2 operates at maximum power, and the controller 54 collects the smoke concentration at several time points within a predetermined time period and sequentially subtracts the smoke concentration at the later time point from the smoke concentration at the earlier time point. If the result is a negative value, it indicates that the smoke concentration in the No. N fire protection area is decreasing; otherwise, it indicates that the smoke concentration in the No. N fire protection area is increasing, and the No. N exhaust fan 2 alone cannot effectively extract the smoke in the No. N fire protection area. For this reason, the channel change plate 55 in the No. N exhaust pipe 4 close to the No. N+1 exhaust pipe 4 rotates 180° to connect the corresponding auxiliary pipe 51 with the No. N exhaust pipe 4. At the same time, the channel change plate 55 in the No. N+1 exhaust pipe 4 close to the No. N exhaust pipe 4 rotates to connect the corresponding auxiliary pipe 51 with the No. N exhaust pipe 4, and finally the No. N+1 exhaust fan 2 is only connected to the No. N exhaust pipe 4, and then the No. N+1 exhaust fan 2 starts to operate. When the N+1 exhaust fan 2 is running and the smoke concentration in the N fire protection area is still above the standard after a predetermined period of time, the corresponding switch plate 55 in the N exhaust pipe 4 and the corresponding switch plate 55 in the adjacent N-1 exhaust pipe 4 rotate, so that the N-1 exhaust fan 2 is only connected to the N exhaust pipe 4, and then the N-1 exhaust fan 2 starts to run. Reference Figure 4 , the exhaust fan 2 will be started in sequence from the distance from the fire zone N where the fire occurred to the distance from the nearest to the farthest, until the smoke concentration in the fire zone N no longer increases. That is, when the exhaust fan 2 No. NM is running and after a predetermined period of time, if the smoke concentration in the fire zone still exceeds the standard, the channel change plate 55 in the N+M exhaust pipe 4 and the channel change plate 55 in the adjacent N+M+1 exhaust pipe 4 rotate to make the exhaust fan 2 No. N+M+1 only connected to the N exhaust pipe 4, and then the exhaust fan 2 No. N+M+1 starts to run, and M≥1. When the exhaust fan 2 No. N+M+1 is running and after a predetermined period of time, if the smoke concentration in the fire zone still exceeds the standard, the channel change plate 55 in the NM exhaust pipe 4 and the channel change plate 55 in the adjacent NM-1 exhaust pipe 4 rotate to make the exhaust fan 2 No. NM only connected to the N exhaust pipe 4, and then the exhaust fan 2 No. NM-1 starts to run.

[0036] Reference Figure 4 The controller 54 presets a limit threshold so that when the smoke concentration detected by the smoke detector 52 is greater than the limit threshold, all the exhaust fans 2 start to operate to extract and reduce the excess smoke in the fire-fighting area where the fire occurs as quickly as possible to reduce the damage to the internal personnel.

[0037] Reference Figure 5When the smoke concentration detected by the N smoke detector 52 exceeds the fire threshold, the N+1 and N-1 blowers 3 are running and after a predetermined period of time, the N+1 and N-1 air pressure sensors 53 detect that the air pressure value in the N+1 and / or N-1 fire protection areas is lower than the preset air pressure value, and the remaining blowers 3 start running to assist in sending air outside the building into the N+1 and / or N-1 fire protection areas. The following describes the situation where the air pressure values ​​in the N+1 and N-1 fire protection areas are still too low.

[0038] Reference Figure 5 , when the N+1 blower 3 runs for a predetermined time and the air pressure in the N+1 fire protection area is still too low, the N air supply pipe 5 and the corresponding N+1 air supply pipe 5 change plates 55 rotate so that the N blower 3 is only connected to the corresponding N+1 air supply pipe 5, and then the N blower 3 starts running. When the N blower 3 runs for a predetermined time and the air pressure in the N+1 fire protection area is still too low, the N+Z and N+1 air supply pipe 5 change plates 55 rotate so that the N+Z blower 3 is only connected to the N+1 air supply pipe 5, and then the N+Z blower starts running, Z≥2.

[0039] Reference Figure 5 , when the N-1 blower 3 runs for a predetermined time and the air pressure in the N-1 fire protection area is still too low, the N air supply pipe 5 and the corresponding N-1 air supply pipe 5 change plate 55 rotate so that the N blower 3 is only connected to the corresponding N+1 air supply pipe 5, and then the N blower 3 starts to run. When the N blower 3 runs for a predetermined time and the air pressure in the N-1 fire protection area is still too low, the NZ and N-1 air supply pipe 5 change plate 55 rotate so that the NZ blower 3 is only connected to the N-1 air supply pipe 5, and then the NZ blower starts to run.

[0040] Since the air pressure values ​​of the smoke-proof fire protection areas N+1 and N-1 do not need to be too large to meet the requirements, it is not necessary for all the air blowers 3 to supply air to one fire protection area.

[0041] The implementation principle of a mechanical pressurized smoke prevention and exhaust system in an embodiment of the present application is: when a fire occurs in a part of the fire protection area and the corresponding exhaust fans 2 and supply fans 3 cannot successfully achieve the smoke prevention and exhaust effects, the exhaust fans 2 and supply fans 3 corresponding to other fire protection areas can be used for assistance to ensure that the corresponding fire protection area can successfully achieve the smoke prevention and exhaust effects.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A mechanical pressurized smoke exhaust system, characterized in that: The invention comprises an array of fans (1) corresponding to each fire protection zone in a building, each group of fans (1) comprising at least one exhaust fan (2) and at least one supply fan (3), a smoke exhaust pipe (4) being connected between the air inlet of each exhaust fan (2) and the corresponding fire protection zone, an air supply pipe (5) being connected between the air outlet of each supply fan (3) and the corresponding fire protection zone, an auxiliary pipe (51) being connected between two smoke exhaust pipes (4) of two adjacent fire protection zones and between two supply pipes (5), a smoke detector (52) for detecting smoke concentration and an air pressure sensor (53) for detecting air pressure are provided in each fire protection zone, and the supply fan (3), the exhaust fan (2), the smoke detector (52) and the air pressure sensor (53) are all electrically connected to a controller (54).

2. A mechanical pressurized smoke exhaust system according to claim 1, characterized in that: Each of the smoke exhaust pipe (4) and air supply pipe (5) is rotatably connected to a channel changing plate (55), the channel changing plate (55) can close the corresponding smoke exhaust pipe (4) or air supply pipe (5), and the channel changing plate (55) can also close the corresponding auxiliary pipe (51), and the auxiliary pipe (51) is provided with a channel changing motor (56) that drives the channel changing plate (55) to rotate and is electrically connected to the controller (54).

3. A mechanical pressurized smoke exhaust system according to claim 2, characterized in that: When the fire protection area where the smoke concentration exceeds the standard corresponds to the exhaust fan (2) No. N and the exhaust fan (2) is in operation for a predetermined period of time, and the smoke concentration detected by the smoke detector (52) in the corresponding fire protection area is still in an elevated state, the switching plate (55) in the No. N smoke exhaust pipe (4) corresponding to the No. N exhaust fan (2) and the switching plate (55) in the adjacent No. N+1 smoke exhaust pipe (4) rotate so that the No. N+1 exhaust fan (2) is only connected to the No. N smoke exhaust pipe (4), and the No. N+1 exhaust fan (2) starts to operate; When the No. N+1 exhaust fan (2) is running and after a predetermined period of time, the smoke concentration in the fire protection area still exceeds the standard, the channel change plate (55) in the No. N exhaust pipe (4) and the channel change plate (55) in the adjacent No. N-1 exhaust pipe (4) rotate so that the No. N-1 exhaust fan (2) is only connected to the No. N exhaust pipe (4), and the No. N-1 exhaust fan (2) starts to run.

4. A mechanical pressurized smoke exhaust system according to claim 3, characterized in that: When the exhaust fan (2) No. NM is running and after a predetermined period of time, the smoke concentration in the fire protection area still exceeds the standard, the channel change plate (55) in the No. N+M smoke exhaust pipe (4) and the channel change plate (55) in the adjacent No. N+M+1 smoke exhaust pipe (4) rotate so that the No. N+M+1 exhaust fan (2) is only connected to the No. N smoke exhaust pipe (4), and the No. N+M+1 exhaust fan (2) starts to run, and M≥1; When the exhaust fan No. N+M+1 (2) is running and after a predetermined period of time, the smoke concentration in the fire protection area still exceeds the standard, the channel change plate (55) in the smoke exhaust pipe No. NM (4) and the channel change plate (55) in the adjacent smoke exhaust pipe No. NM-1 (4) are rotated so that the exhaust fan No. NM (2) is only connected to the smoke exhaust pipe No. N (4), and the exhaust fan No. NM-1 (2) starts to run.

5. A mechanical pressurized smoke exhaust system according to claim 2, characterized in that: When the smoke concentration detected by the smoke detector (52) No. N corresponding to the fire zone No. N exceeds the smoke concentration threshold preset in the controller (54), the air blowers (3) corresponding to the two fire zones No. N+1 and No. N-1 adjacent to the fire zone No. N are operated.

6. A mechanical pressurized smoke exhaust system according to claim 5, characterized in that: When the air supply fans (3) No. N+1 and No. N-1 are running for a predetermined period of time and the air pressure value in the fire protection area No. N+1 and / or No. N-1 has not reached the standard, the switching plates (55) of the air supply pipe No. N and the corresponding air supply pipe No. N+1 and / or No. N-1 (5) are rotated so that the air supply fan (3) No. N is only connected to the corresponding air supply pipe No. N+1 and / or No. N-1 (5), and the air supply fan (3) No. N starts to run.

7. A mechanical pressurized smoke exhaust system according to claim 6, characterized in that: When the air pressure value in the fire protection area No. N+1 and / or No. N-1 has not reached the standard after the N air supply fan (3) has been running for a predetermined period of time, the change plate (55) of the N+Z and / or N+1 air supply pipes (5) or the change plate (55) of the NZ and / or N-1 air supply pipes (5) rotates, so that the N+Z air supply fan (3) is only connected to the N+1 air supply pipe (5) and / or the NZ air supply fan (3) is only connected to the N-1 air supply pipe (5), and the N+Z air supply fan (3) and / or the NZ air supply fan (3) start to run, and Z≥2.

8. A mechanical pressurized smoke exhaust system according to claim 2, characterized in that: Each of the channel changing plates (55) is fixedly connected to a plate frame (57) which is tightly fitted to the inner wall of the air supply pipe (5) or the smoke exhaust pipe (4) and can be elastically deformed.

9. A mechanical pressurized smoke exhaust system according to claim 8, characterized in that: The plate frame (57) is located on a side of the channel changing plate (55) facing the corresponding auxiliary pipe (51), and when the surface of the plate frame (57) provided with an opening is in contact with the inner walls of the air supply pipe (5) and the smoke exhaust pipe (4), the opening of the auxiliary pipe (51) is directly opposite to the opening of the plate frame (57).

10. A mechanical pressurized smoke exhaust system according to claim 9, characterized in that: The two opposite surfaces of the plate frame (57) in the direction of the rotation axis are both formed into arc surfaces.

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