Smoke exhaust fireproof valve with filtering function applied to ventilation pipeline of railway vehicle

Abstract

The invention discloses a smoke exhaust fireproof valve with a filtering function, which is applied to a ventilation pipeline of a railway vehicle, and has the advantages that blades can be conveniently detached and replaced, and the key points of the technical scheme are as follows: a rotating shaft is rotationally arranged in a smoke exhaust channel, and the upper end of the rotating shaft extends out of a valve body and is driven by an actuator to rotate; a plane is arranged on the side, deviating from the air flowing direction in the smoke exhaust channel, of the rotating shaft, the rotating shaft is detachably connected with blades through the plane, sealing plates are arranged on the portions, on the two faces of the blades, of the opposite inner walls of the smoke exhaust channel correspondingly, the sealing plates are distributed along the inner wall of the smoke exhaust channel, and the two ends of each sealing plate extend to the upper end and the lower end of the rotating shaft correspondingly. When the rotating shaft rotates to enable the blades to rotate to the position for sealing the smoke exhaust channel, the two faces of each blade abut against the sealing plates, and the two sealing plates are distributed in a relatively staggered mode.

Description

Technical Field

[0001] This invention relates to the field of ventilation system technology for rail vehicles, specifically to a smoke exhaust and fireproof valve with filtering function applied to ventilation ducts of rail vehicles. Background Technology

[0002] When a fire occurs in a rail vehicle, the actuator inside the valve that controls the opening of the valve will cause the valve to close, cutting off the ventilation ducts in the fire area (such as the carriage or equipment compartment), preventing flames and high-temperature smoke from spreading to other carriages or critical equipment areas through the ventilation ducts, and buying valuable time for passenger evacuation and rescue.

[0003] In the early stages of a fire: Valves can be kept open or their opening adjusted, working in conjunction with smoke exhaust fans to quickly expel the dense smoke generated in the fire area from the vehicle, maintaining a relatively clear escape route.

[0004] Air filtration during normal operation: The integrated filter can filter dust, pollen, particulate matter, etc. in the fresh air entering the ventilation system, improve the air quality in the cabin, protect the air conditioning unit and radiator from contamination, and extend the equipment life.

[0005] However, during a fire, the temperature inside the pipeline may reach as high as 280°C. Under such high temperatures, the blades inside the valve will soften and deform, affecting the tightness of the valve closure later. Therefore, the blades need to be replaced. Summary of the Invention

[0006] To address the aforementioned technical shortcomings, the purpose of this invention is to provide a smoke exhaust fire damper with filtering function for use in the ventilation ducts of rail vehicles, which has the advantage of being easy to remove and replace the blades.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This invention provides a smoke exhaust fire damper with filtering function applied to the ventilation duct of rail vehicles, including a valve body and a smoke exhaust channel disposed on the valve body. A rotating shaft is rotatably disposed in the smoke exhaust channel. The upper end of the rotating shaft extends out of the valve body and is driven to rotate by an actuator. A flat surface is opened on the side of the rotating shaft opposite to the air flow direction in the smoke exhaust channel. Blades are detachably connected to the rotating shaft through the flat surface. Sealing plates are respectively provided on both sides of the blades on the opposite inner walls of the smoke exhaust channel. The sealing plates are distributed along the inner wall of the smoke exhaust channel and the two ends of the sealing plates extend to the upper and lower ends of the rotating shaft, respectively. When the shaft rotates and the blades rotate to the position of the closed smoke exhaust channel, both sides of the blades come into contact with the sealing plate. There are two sealing plates, which are relatively staggered.

[0008] By adopting the above technical solution, the actuator drives the rotating shaft to rotate. The planar design facilitates an increase in the connection area between the blade and the rotating shaft. Furthermore, the blade is an integral design, formed by a single stamping process, reducing connection points, preventing weld cracking, and minimizing blade deformation. When the blade rotates to the position of closing the smoke exhaust channel, both sides of the blade abut against the sealing plate, effectively sealing the valve body. When the blade needs to be replaced, it is rotated away from the sealing plate, and then removed from the rotating shaft. Since the blade is an integral plate, it can be easily removed from the rotating shaft and pulled out of the smoke exhaust channel. When a new blade needs to be installed, simply place the entire plate into the smoke exhaust channel, aligning it with the planar surface, and then install the blade onto the rotating shaft.

[0009] Preferably, the plane is in contact with the blade surface, and the rotating shaft is threaded with several bolts on the side away from the plane. Each bolt is distributed along the length of the rotating shaft, and one end of each bolt passes through the rotating shaft and the blade and is threaded with a nut.

[0010] Preferably, the sealing plate includes a connecting plate connected to the smoke exhaust channel and an abutting plate disposed on the side of the connecting plate facing the blade and abutting against the blade. The abutting plate and the connecting plate form a plate with an L-shaped longitudinal section. The side of the abutting plate facing the blade is provided with a sealing strip distributed along the surface of the abutting plate.

[0011] Preferably, the smoke exhaust channel has a filter screen on one side of the blade. The filter screen is used to block external impurities. When the blade rotates to open the smoke exhaust channel, the filter screen covers the smoke exhaust channel. When the blade rotates to close the smoke exhaust channel, the blade abuts against the sealing plate. At this time, the sealing plate slides and connects to the smoke exhaust channel. The valve body is provided with a smoke exhaust pipe that communicates with the smoke exhaust channel. The rotating blade abuts against the sealing plate, causing the sealing plate to move and thus opening the smoke exhaust pipe, realizing the smoke exhaust work in the early stage of fire.

[0012] Preferably, one end of the exhaust pipe extends into the exhaust channel, and the sealing plate includes a sealing plate that slides against the inner wall of the exhaust channel and a push plate that abuts against the blade. The sealing plate closes the position where the exhaust pipe communicates with the exhaust channel. The push plate is distributed along the edge of the blade and both ends of the push plate extend to a position close to the rotating shaft. The inner wall of the exhaust channel is provided with a vertical plate, and the vertical plate is provided with a compression spring that abuts the push plate against the blade. When the blade rotates to open the exhaust channel, the exhaust channel is provided with a limiting member that restricts the movement of the push plate.

[0013] Preferably, the limiting member includes a notch formed on the blade near the edge of the push plate, and the smoke exhaust channel is provided with a limiting block extending into the notch and abutting against one side of the push plate. The blade has two notches on one side and is distributed on the upper and lower sides of the notch.

[0014] Preferably, the outer wall of the filter screen is provided with a mesh frame, the upper end of the mesh frame is rotatably connected to the inner wall of the upper end of the smoke exhaust channel via a rotating shaft, the smoke exhaust channel is provided with an abutment frame below the mesh frame, the abutment frame is provided with an inclined surface on the side facing the mesh frame, the mesh frame is provided with inclined extrusion surfaces that cooperate with the inclined surface, and the abutment frame is located on the side of the mesh frame away from the blades.

[0015] Preferably, the smoke exhaust channel is equipped with a smoke sensor on the side of the blade away from the filter screen, and the outer wall of the valve body is equipped with a motor that drives the rotating shaft to rotate. When the smoke sensor detects that the smoke value in the smoke exhaust channel reaches a certain value, it controls the motor to rotate, so that the mesh frame rotates away from the contact frame.

[0016] Preferably, the filter screen has a filter cotton layer on the side facing the blades, and a fixing frame is provided around the outer wall of the filter cotton layer. The fixing frame and the screen frame are detachably connected by several screws.

[0017] Preferably, when the filter screen rotates to a position close to the inner wall of the upper end of the smoke exhaust channel, the outer wall of the valve body is provided with a disassembly hole that communicates with the inside of the smoke exhaust channel for disassembling the fixing frame, and the valve body is provided with a cover plate to close the disassembly hole.

[0018] The beneficial effects of this invention are as follows: the actuator drives the rotating shaft to rotate; the planar design facilitates an increase in the connection area between the blade and the rotating shaft; and the blade is an integral design, formed by integral stamping, reducing connection points, avoiding weld cracking, and reducing blade deformation. When the blade rotates to the position of closing the smoke exhaust channel, both sides of the blade abut against the sealing plate, thus sealing the valve body. When the blade needs to be replaced, the blade is rotated to a position away from the sealing plate, and then the blade is removed from the rotating shaft. Since the blade is an integral plate, it can be easily removed from the rotating shaft and pulled out of the smoke exhaust channel. When a new blade needs to be installed, simply place the entire plate into the smoke exhaust channel, aligning it with the planar surface, and then install the blade onto the rotating shaft. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this embodiment; Figure 2 This is a schematic diagram illustrating the structure of the rotating shaft in this embodiment; Figure 3Schematic diagram for embodying the sealing plate in Embodiment 1 and the structure of the limiting block and notch in Embodiment 2 in this embodiment; Figure 4 Schematic diagram for embodying the chassis blade in this embodiment; Figure 5 Schematic diagram for embodying the sealing plate in Embodiment 2 in this embodiment.

[0021] Explanation of reference numerals: In the figure: 1, valve body; 11, smoke exhaust channel; 12, rotating shaft; 121, actuator; 122, plane; 123, blade; 124, sealing plate; 125, bolt; 126, connecting plate; 127, abutting plate; 13, filter net; 14, smoke exhaust pipe; 15, closing plate; 151, push plate; 152, vertical plate; 153, compression spring; 16, notch; 161, limiting block; 162, mesh frame; 163, rotating shaft; 17, abutting frame; 171, inclined surface; 18, smoke sensor; 19, filter cotton layer; 191, fixing frame; 192, cover plate. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1: A smoke exhaust fire damper with a filtering function applied to the ventilation duct of a rail vehicle, as Figure 1-4 , includes a valve body 1 and a smoke exhaust channel 11 provided on the valve body 1. A rotating shaft 12 is rotatably provided in the smoke exhaust channel 11. The upper end of the rotating shaft 12 extends out of the valve body 1 and is driven to rotate by an actuator 121. A plane 122 is provided on one side of the rotating shaft 12 departing from the air flow direction in the smoke exhaust channel 11. The rotating shaft 12 is detachably connected with a blade 123 through the plane 122. The model of the actuator 121 is BFL24. Sealing plates 124 are respectively provided on both inner walls of the smoke exhaust channel 11 on both sides of the blade 123. The sealing plates 124 are distributed along the inner wall of the smoke exhaust channel 11, and both ends of the sealing plates 124 respectively extend to the upper and lower ends of the rotating shaft 12. At this time, each sealing plate 124 is in a U shape. The openings of the two sealing plates 124 face each other and are distributed on both sides of the blade 123; As Figure 1-4 , when the rotating shaft 12 rotates to make the blade 123 rotate to the position of closing the smoke exhaust channel 11, both sides of the blade 123 abut against the sealing plates 124. There are two sealing plates 124, and they are distributed in a relatively staggered manner.

[0024] As Figure 1-4 The actuator 121 drives the rotating shaft 12 to rotate. The plane 122 is designed to increase the connection area between the blade 123 and the rotating shaft 12. The blade 123 is an integral design, formed by integral stamping, which reduces connection points, avoids weld cracking, and reduces deformation of the blade 123. When the blade 123 rotates to the position of closing the smoke exhaust channel 11, both sides of the blade 123 abut against the sealing plate 124, which serves to close the valve body 1. When the blade 123 needs to be replaced, the blade 123 is rotated to a position away from the sealing plate 124, and then the blade 123 is removed from the rotating shaft 12. Since the blade 123 is an integral plate, it can be easily removed from the rotating shaft 12 and pulled out of the smoke exhaust channel 11. When a new blade 123 needs to be installed, simply place the entire plate into the smoke exhaust channel 11, fit it against the plane 122, and then install the blade 123 onto the rotating shaft 12.

[0025] like Figure 1-4 The plane 122 is in contact with the plate surface of the blade 123. At this time, the rotating shaft 12 is located at the center of the plate surface of the blade 123. Several bolts 125 are threadedly connected to the side of the rotating shaft 12 away from the plane 122. Each bolt 125 is distributed along the length of the rotating shaft 12. One end of the bolt 125 passes through the rotating shaft 12 and the blade 123 and is threadedly connected to a nut. At this time, the blade 123 also has through holes for the bolts 125 to pass through. When installing the blade 123, the through holes on the blade 123 can be aligned with the bolts 125 on the rotating shaft 12. The blade 123 can be installed on the rotating shaft 12 by rotating the bolts 125. It is simple and convenient.

[0026] like Figure 1-4 The sealing plate 124 includes a connecting plate 126 connected to the smoke exhaust channel 11 and an abutting plate 127 disposed on the side of the connecting plate 126 facing the blade 123 and abutting against the blade 123. The abutting plate 127 and the connecting plate 126 form a plate with an L-shaped longitudinal section. The side of the abutting plate 127 facing the blade 123 is provided with a sealing strip distributed along the surface of the abutting plate 127.

[0027] like Figure 1-4 When the rotating shaft 12 drives the blade 123 to rotate, the two ends of the blade 123 rotate away from the corresponding contact plate 127, thereby opening the valve body 1. When the rotating shaft 12 drives the blade 123 to rotate towards the contact plate 127, it contacts the contact plate 127, thereby closing the valve body 1.

[0028] like Figure 1-4 The valve body 1 is a rectangular frame with flanges at both ends installed on the pipeline. When the blades 123 need to be replaced, the valve body 1 can be removed from the pipeline. At this time, the inner wall of the valve body 1 is coated with a heat insulation coating, and the outer wall of the valve body 1 is covered with a fireproof and heat-insulating cotton layer.

[0029] Example 2: A smoke exhaust fire damper with filtering function applied to ventilation ducts of rail vehicles, such as... Figure 3 and Figure 5 The difference from Embodiment 1 above is that the smoke exhaust channel 11 is provided with a filter screen 13 on one side of the blade 123. The filter screen 13 is used to block external impurities and is located on the side where the outside air enters the smoke exhaust channel 11. like Figure 3 and Figure 5 When the valve body 1 is in normal operation, the air filter is in operation. When the blades 123 rotate to open the smoke exhaust channel 11, the filter screen 13 covers the smoke exhaust channel 11 to filter impurities. like Figure 3 and Figure 5 The valve body 1 performs smoke extraction in the early stage of a fire: When the blade 123 rotates to the position of closing the smoke extraction channel 11, the blade 123 abuts against the sealing plate 124. At this time, the sealing plate 124 is slidably connected in the smoke extraction channel 11. The valve body 1 is provided with a smoke extraction pipe 14 that communicates with the smoke extraction channel 11. The rotating blade 123 abuts against the sealing plate 124, causing the sealing plate 124 to move, thereby opening the smoke extraction pipe 14 and realizing the smoke extraction work in the early stage of a fire. At this time, the smoke in the smoke extraction channel 11 is discharged through the smoke extraction pipe 14, so that the smoke does not pass through the filter screen 13.

[0030] like Figure 3 and Figure 5The specific implementation structure is as follows: one end of the exhaust pipe 14 extends into the exhaust channel 11, and the sealing plate 124 includes a sealing plate 15 that slides against the inner wall of the exhaust channel 11 and a push plate 151 that abuts against the blade 123. The sealing plate 15 closes the position where the exhaust pipe 14 communicates with the exhaust channel 11. The push plate 151 is distributed along the edge of the blade 123 and both ends of the push plate 151 extend to the position close to the rotating shaft 12. At this time, the push plate 151 is U-shaped. The inner wall of the exhaust channel 11 is provided with a vertical plate 152. At this time, the vertical plate 152 is set on the upper inner wall of the exhaust channel 11. The vertical plate 152 is provided with a compression spring 153 that abuts the push plate 151 against the blade 123. When the blade 123 rotates to open the exhaust channel 11, that is, when it rotates away from the push plate 151, the exhaust channel 11 is provided with a limiting member to restrict the movement of the push plate 151. At this time, the function of the limiting component is to restrict the movement of the sealing plate 15 and the push plate 151 when the blade 123 opens the smoke exhaust passage 11. At this time, the compression spring 153 is in its natural state, that is, it is not under force, which is the air filtration during normal operation. When the blade 123 moves towards the push plate 151 until it touches the push plate 151, the smoke exhaust passage 11 is closed. However, smoke exhaust is required in the early stage of the fire. Therefore, the actuator 121 controls the rotating shaft 12 to continue to rotate, so that the blade 123 continuously squeezes the push plate 151, and then drives the sealing plate 15 to move through the push plate 151. The sealing plate 15 moves and gradually exposes the smoke exhaust pipe 14, so that the smoke entering the smoke exhaust passage 11 can be discharged through the smoke exhaust pipe 14. At this time, the blade 123 still closes most of the smoke exhaust passage 11, realizing the smoke exhaust work of the valve body 1 in the early stage of the fire. like Figure 3 and Figure 5 In the later stages of a fire, valve body 1 can operate in two ways: one is to continue operating in the initial fire state, with smoke exhaust pipe 14 discharging most of the smoke from smoke exhaust channel 11; the other is for blade 123 to move away from push plate 151, causing sealing plate 15 to reset under the action of compression spring 153, thus closing smoke exhaust pipe 14 again. At this point, blade 123 rotates to a position where it just contacts push plate 151, meaning push plate 151 is limited by the limiting element, closing smoke exhaust channel 11 and preventing flames and high-temperature smoke from spreading to other carriages or critical equipment areas through the duct. The end of smoke exhaust pipe 14 away from valve body 1 extends to connect with the outside air.

[0031] like Figure 3 and Figure 5The limiting component includes a notch 16 formed on the edge of the blade 123 near the push plate 151. The smoke exhaust channel 11 is provided with a limiting block 161 extending into the notch 16 and abutting against one side of the push plate 151. When the blade 123 rotates, the notch 16 does not restrict the rotation of the blade 123. The notch 16 is only set to facilitate the contact between the limiting block 161 and the blade 123. There are two notches 16 on one side of the blade 123, which are distributed on the upper and lower sides of the notch 16. At this time, the notches 16 correspond to the distribution of the push plate 151. When the limiting component limits the position of the push plate 151, the plate surface of the blade 123 is parallel to the push plate 151, and the notch 16 is closed by the push plate 151. As the blade 123 rotates and continues to squeeze the push plate 151, the gap between the notch 16 and the push plate 151 increases. However, in the early stage of the fire, most of the smoke is still discharged through the smoke exhaust pipe 14.

[0032] like Figure 3 and Figure 5 The filter screen 13 has a mesh frame 162 circumferentially arranged on its outer wall. The upper end of the mesh frame 162 is rotatably connected to the inner wall of the upper end of the smoke exhaust channel 11 through a rotating shaft 163. The smoke exhaust channel 11 has an abutment frame 17 below the mesh frame 162. The abutment frame 17 has an inclined surface 171 on the side facing the mesh frame 162. The lower end of the inclined surface 171 is distributed close to the inner wall of the smoke exhaust channel 11. The mesh frame 162 has an inclined extrusion surface that cooperates with the inclined surface 171. The abutment frame 17 is located on the side of the mesh frame 162 away from the blade 123.

[0033] like Figure 3 and Figure 5 The smoke exhaust channel 11 has a smoke sensor 18 on the side of the blades 123 facing away from the filter screen 13. A motor (not shown in the figure) drives the rotating shaft 163 to rotate on the outer wall of the valve body 1. When the smoke sensor 18 detects that the smoke concentration in the smoke exhaust channel 11 reaches a certain value, it controls the motor to rotate, causing the mesh frame 162 to rotate away from the contact frame 17. The purpose of this design is that when smoke enters the smoke exhaust channel 11, the smoke sensor 18 detects that the smoke concentration reaches a certain value and controls the motor to rotate, causing the mesh frame 162 to rotate away from the contact frame 17, thus causing the filter screen 13 to face downwards. This design is intended for later stages of a fire when smoke exhaust is needed. The actuator 121 drives the rotating shaft 12 to open and expel the smoke entering the smoke exhaust channel 11. If the filter screen 13 still covers the smoke exhaust channel 11 at this time, it will slow down the smoke exhaust speed and affect the filter screen 13. Therefore, the motor needs to drive the motor to rotate, causing the filter screen 13 to rotate to the top inside the smoke exhaust channel 11, facilitating the exhaust of smoke through the smoke exhaust channel 11.

[0034] like Figure 3 and Figure 5The filter screen 13 has a filter cotton layer 19 on the side facing the blade 123. A fixing frame 191 is provided around the outer wall of the filter cotton layer 19. The fixing frame 191 is detachably connected to the screen frame 162 by several screws. This facilitates the replacement of the filter cotton layer 19. When the filter screen 13 is rotated to the upper part of the smoke exhaust channel 11, the filter cotton layer 19 is distributed close to the upper inner wall of the smoke exhaust channel 11, thereby reducing the pollution of the filter cotton layer 19 by the smoke.

[0035] like Figure 3 and Figure 5 When the filter screen 13 rotates to be close to the inner wall of the upper end of the smoke exhaust channel 11, the outer wall of the valve body 1 is provided with a disassembly hole that communicates with the inside of the smoke exhaust channel 11. This hole is used to disassemble the fixing frame 191, so that the filter cotton layer 19 can be replaced without removing the valve body 1 from the pipe. The valve body 1 is provided with a cover plate 192 that closes the disassembly hole. The cover plate 192 is detachably connected to the valve body 1 by bolts 125, which makes it easy to open the disassembly hole and remove the filter cotton layer 19 from the screen frame 162. At this time, the filter cotton layer 19 is distributed close to the inner wall of the upper end of the smoke exhaust channel 11.

[0036] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A smoke exhaust fire damper with filtering function applied to ventilation ducts of rail vehicles, comprising a valve body (1) and a smoke exhaust channel (11) disposed on the valve body (1), characterized in that, The exhaust channel (11) is rotatably provided with a rotating shaft (12). The upper end of the rotating shaft (12) extends out of the valve body (1) and is driven to rotate by the actuator (121). The rotating shaft (12) has a flat surface (122) on the side opposite to the air flow direction in the exhaust channel (11). The rotating shaft (12) is detachably connected to a blade (123) through the flat surface (122). The inner walls of the exhaust channel (11) are respectively provided with sealing plates (124) on both sides of the blade (123). The sealing plates (124) are distributed along the inner wall of the exhaust channel (11) and the two ends of the sealing plates (124) extend to the upper and lower ends of the rotating shaft (12). When the rotating shaft (12) rotates and the blade (123) rotates to the position of the closed smoke exhaust channel (11), both sides of the blade (123) abut against the sealing plate (124). There are two sealing plates (124), which are relatively staggered.

2. The smoke exhaust fire damper with filtering function applied to the ventilation ducts of rail vehicles as described in claim 1, characterized in that, The plane (122) is in contact with the plate surface of the blade (123). The rotating shaft (12) is threaded with several bolts (125) on the side away from the plane (122). Each bolt (125) is distributed along the length of the rotating shaft (12). One end of each bolt (125) passes through the rotating shaft (12) and the blade (123) and is threaded with a nut.

3. The smoke exhaust fire damper with filtering function applied to the ventilation ducts of rail vehicles as described in claim 1, characterized in that, The sealing plate (124) includes a connecting plate (126) connected to the smoke exhaust channel (11) and an abutting plate (127) disposed on the side of the connecting plate (126) facing the blade (123) and abutting the blade (123). The abutting plate (127) and the connecting plate (126) form a plate with an L-shaped longitudinal section. The side of the abutting plate (127) facing the blade (123) is provided with a sealing strip distributed along the surface of the abutting plate (127).

4. The smoke exhaust fire damper with filtering function applied to the ventilation ducts of rail vehicles as described in claim 1, characterized in that, The smoke exhaust channel (11) has a filter screen (13) on one side of the blade (123). The filter screen (13) is used to block external impurities. When the blade (123) rotates to open the smoke exhaust channel (11), the filter screen (13) covers the smoke exhaust channel (11). When the blade (123) rotates to close the smoke exhaust channel (11), the blade (123) abuts against the sealing plate (124). At this time, the sealing plate (124) slides and connects to the smoke exhaust channel (11). The valve body (1) is provided with a smoke exhaust pipe (14) that communicates with the smoke exhaust channel (11). The rotating blade (123) abuts against the sealing plate (124), causing the sealing plate (124) to move, thereby opening the smoke exhaust pipe (14) and realizing the smoke exhaust work in the early stage of fire.

5. The smoke exhaust fire damper with filtering function applied to the ventilation ducts of rail vehicles as described in claim 4, characterized in that, One end of the exhaust pipe (14) extends into the exhaust channel (11), and the sealing plate (124) includes a sealing plate (15) that slides against the inner wall of the exhaust channel (11) and a push plate (151) that abuts against the blade (123). The sealing plate (15) closes the position where the exhaust pipe (14) communicates with the exhaust channel (11). The push plate (151) is distributed along the edge of the blade (123) and both ends of the push plate (151) extend to a position close to the rotating shaft (12). The inner wall of the exhaust channel (11) is provided with a vertical plate (152). The vertical plate (152) is provided with a compression spring (153) that abuts the push plate (151) against the blade (123). When the blade (123) rotates to open the exhaust channel (11), the exhaust channel (11) is provided with a limiting member that restricts the movement of the push plate (151).

6. The smoke exhaust fire damper with filtering function applied to the ventilation duct of a rail vehicle as described in claim 5, characterized in that, The limiting component includes a notch (16) opened on the edge of the blade (123) near the push plate (151). The smoke exhaust channel (11) is provided with a limiting block (161) extending into the notch (16) and abutting against one side of the push plate (151). There are two notches (16) on one side of the blade (123) and they are distributed on the upper and lower sides of the notch (16).

7. The smoke exhaust fire damper with filtering function applied to the ventilation duct of rail vehicles as described in claim 6, characterized in that, The filter screen (13) has a mesh frame (162) circumferentially arranged on its outer wall. The upper end of the mesh frame (162) is rotatably connected to the upper inner wall of the smoke exhaust channel (11) via a rotating shaft (163). The smoke exhaust channel (11) has an abutment frame (17) below the mesh frame (162). The abutment frame (17) has an inclined surface (171) on the side facing the mesh frame (162). The mesh frame (162) has an inclined extrusion surface that cooperates with the inclined surface (171). The abutment frame (17) is located on the side of the mesh frame (162) away from the blade (123).

8. The smoke exhaust fire damper with filtering function applied to the ventilation duct of a rail vehicle as described in claim 7, characterized in that, The smoke exhaust channel (11) has a smoke sensor (18) on the side of the blade (123) away from the filter screen (13). The outer wall of the valve body (1) is provided with a motor that drives the rotating shaft (163) to rotate. When the smoke sensor (18) detects that the smoke value in the smoke exhaust channel (11) reaches a certain value, it controls the motor to rotate, so that the mesh frame (162) rotates away from the contact frame (17).

9. The smoke exhaust fire damper with filtering function applied to the ventilation duct of a rail vehicle as described in claim 8, characterized in that, The filter screen (13) has a filter cotton layer (19) on the side facing the blade (123). The outer wall of the filter cotton layer (19) is provided with a fixing frame (191). The fixing frame (191) and the screen frame (162) are detachably connected by several screws.

10. The smoke exhaust fire damper with filtering function applied to the ventilation duct of a rail vehicle as described in claim 9, characterized in that, When the filter screen (13) rotates to the inner wall of the upper end of the smoke exhaust channel (11), the outer wall of the valve body (1) is provided with a disassembly hole that communicates with the smoke exhaust channel (11) for disassembling the fixing frame (191). The valve body (1) is provided with a cover plate (192) to close the disassembly hole.

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