Multi-blade type fire damper

Abstract

The utility model provides a multi-blade type fireproof brake, which is applied to the technical field of fireproof equipment, the fireproof brake comprises a fireproof brake frame body, a fireproof device, a retaining device and an elastic device, the fireproof device comprises a first fireproof module and a second fireproof module, the first fireproof module comprises two first fireproof blades, and the second fireproof module comprises two second fireproof blades. The second fireproof module comprises at least one second fireproof blade and a connecting rod, the two first fireproof blades are kept in a folded state through a keeping device, and the keeping device comprises a fusing mechanism; when a fire disaster occurs, the fusing mechanism is broken, the first fireproof blade is closed through the elastic device, and meanwhile the second fireproof blade is driven to be closed through the connecting rod. Interlocking closing of the multiple blades is achieved through the connecting rods and the elastic devices, the high response speed is achieved, and the good sealing effect can be controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of fire dampers, and particularly relates to a multi-blade fire damper. Background Art

[0002] The importance of fire dampers in modern buildings cannot be ignored. With the progress of technology and the continuous improvement of people's safety requirements, the design and manufacture of fire dampers are also continuously upgraded to meet increasingly strict safety standards; as an important fire-fighting equipment, fire dampers can effectively prevent the spread of fire during a fire; these dampers can be quickly closed within a short time, thereby isolating the fire source and providing valuable time for personnel evacuation and fire extinguishing; at the same time, fire dampers can also effectively prevent the diffusion of smoke and toxic gases and protect people's lives.

[0003] At present, in order to achieve fire prevention of air ducts, single-blade, double-blade or multi-blade fire dampers are all adopted. Among them, the single-blade fire damper may have a slow response speed and cannot quickly isolate the fire source. Moreover, when the single-blade fire damper faces high wind pressure, it may not be able to fully close or maintain the closed state, and the strong air flow may push the blade to open partially, resulting in sealing failure; and the double-blade fire damper has poor compatibility with air ducts and cannot be applied to air ducts of various shapes; while traditional multi-blade fire dampers usually close by the gravity of the blades or through a control system, with a slow response speed, and the sealing performance of traditional fire dampers is often insufficient. Especially in high-temperature situations, the materials of the fire prevention device may deform, affecting the sealing effect; under this premise, how to use a multi-blade fire damper to achieve rapid closing while ensuring the sealing of the fire damper is an urgent technical problem in the industry.

[0004] Based on this, a multi-blade fire damper is needed, using a fire damper with multi-blade interlocking closing to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide a multi-blade fire damper, and the purpose of the utility model is realized by adopting the following technical solutions:

[0006] The utility model provides a multi-blade fire damper, comprising:

[0007] A fire damper frame;

[0008] A fire prevention device arranged in the fire damper frame, the fire prevention device comprises at least one first fire prevention module, the first fire prevention module comprises two first fire prevention blades and a first rotating shaft, and the first fire prevention blades are rotatably connected through the first rotating shaft;

[0009] Retention device, the retention device includes a fusing module and two docking heads, the two docking heads are respectively arranged on the two first fireproof blades, and the positions of the two docking heads correspond to each other; the two first fireproof blades are kept closed by the fusing module between the two docking heads;

[0010] Elastic device, the elastic device is arranged at the first rotating shaft, and the elastic force of the elastic device drives the first fireproof blade to close.

[0011] Preferably, the multi-blade fire damper further includes at least one second fireproof module, the second fireproof module includes at least one second fireproof blade, a second rotating shaft and a connecting rod, the second fireproof blade is connected to the connecting rod and the fire damper frame body through the second rotating shaft, and the second rotating shaft is connected to the first rotating shaft through the connecting rod.

[0012] Further, grooves are circumferentially arranged on the inner wall and / or outer wall of the fire damper frame body, and the grooves are filled with intumescent fireproof materials.

[0013] Further, grooves are circumferentially arranged on the outer wall of the fire damper frame body, and a sealing wall is arranged on the inner wall of the fire damper frame body corresponding to the position of the grooves, and the first fireproof blade and the second fireproof blade are in close contact with the sealing wall when closed.

[0014] Further, a first sealing gasket is also arranged on the outer wall of the fire damper frame body, and the first sealing gasket is arranged at an interval from the groove.

[0015] Preferably, a second sealing gasket is arranged at the first rotating shaft and / or the second rotating shaft.

[0016] Further, a third sealing gasket is arranged around the circumferences of the first fireproof blade and the second fireproof blade.

[0017] Preferably, expanded graphite layers are arranged on the fire-facing surface and the back-fire surface of the first fireproof blade and the second fireproof blade.

[0018] Further, the fusing module includes a thermal fuse and a first fireproof spring, and the thermal fuse is connected to the docking head through the first fireproof spring.

[0019] Preferably, the elastic device includes a second fireproof spring.

[0020] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above technical solutions adopted in the embodiments of this specification at least include:

[0021] First, through the interlocking mechanism of the connecting rod and the fireproof spring, the present utility model can ensure that the first fireproof blade and the second fireproof blade close simultaneously during a fire, improving the sealing performance of the fire damper, effectively preventing flames and smoke from passing through, enhancing the overall fireproof efficiency; through one active action (such as the breakage of the fusing mechanism), all blades can respond simultaneously, avoiding the complexity of individual operations, and improving the reliability and response speed of the system; the interlocking closing mechanism can ensure that the fireproof blades closely adhere to the fire damper frame when closing, reducing gaps and leakage points. Good sealing performance helps the fire damper provide a better isolation effect during a fire.

[0022] Second, by providing an expanded fireproof layer on the fire-facing surface, back-fire surface, and circumferential surface of the first fireproof blade and the second fireproof blade, the expanded fireproof layers on the fire-facing surface and back-fire surface will rapidly expand at high temperatures, forming a thick heat insulation layer that can effectively block the transmission of flames and high temperatures, thereby enhancing the fireproof performance of the fire damper; the expanded fireproof layers on the fire-facing surface and back-fire surface can also improve the high-temperature resistance of the fireproof blades, enabling them to remain stable during a fire and preventing deformation or failure caused by high temperatures; the expansion effect of the expanded fireproof layers on the fire-facing surface and back-fire surface can enhance the structural stability of the fireproof blades, preventing deformation at high temperatures, and thus maintaining the overall function of the fire damper; the expanded fireproof layers on the fire-facing surface and back-fire surface have excellent heat insulation performance, which can significantly reduce the heat conduction through the fireproof blades, protecting buildings and equipment from high-temperature damage; when the expanded fireproof layer on the circumferential surface expands, it can fill the gaps between the fireproof blades and the fire damper frame, improving the sealing performance, reducing the leakage of smoke and heat, and ensuring the airtightness of the fire damper.

[0023] Third, by providing sealing gaskets at the first rotating shaft, second rotating shaft, and fire damper frame, the airtightness between the fire damper and the air duct or other interfaces is ensured, effectively preventing the leakage of air, smoke, and harmful gases through the interfaces, thereby improving the sealing effect of the fire damper; by using sealing gaskets at the fire damper frame, the stable and tight connection between the fire damper and the air duct or other connecting components can be ensured, avoiding vibrations or displacements caused by loose connections.

[0024] Fourth, the utility model is provided with grooves on the inner and outer walls of the fire damper frame, and the grooves are filled with expandable fireproof materials. The grooves on the inner wall enable the fireproof blades to be in close contact with the expandable fireproof materials. The expandable fireproof materials in the grooves can expand at high temperatures, filling the gaps between the fireproof blades and the frame, effectively improving the sealing performance of the fire damper, preventing smoke and flames from leaking through the gaps, and ensuring the fireproof effect. The grooves are provided on the outer wall of the fire damper frame and filled with expandable fireproof materials, which helps to reduce the thermal bridge effect (i.e., heat transfer through the weak points of the structure), improving the overall heat insulation performance of the fire damper. At the same time, the expandable fireproof materials in the grooves on the outer wall can expand at high temperatures, filling the gaps between the fire damper frame and the air duct, and jointly with the sealing gasket, improving the sealing performance of the fire damper.

[0025] Fifth, the utility model has high adaptability and can be applied to air ducts of various shapes. By changing the shapes of the first fireproof blade and the second fireproof blade, the fire damper can effectively act on different-shaped air duct systems. Whether the air duct is circular, square, rectangular or other irregular shapes, the fire damper in the utility model can match the contour of the air duct by adjusting the blade shape. There is no need to design multiple fire dampers for different air duct types, and only by adjusting the blade shape can the requirements be met, simplifying the installation process. The adaptability means that the fire damper can be applied to different building systems and ventilation designs, with extremely high versatility. By customizing the blade shape to closely fit the inner wall of the air duct, the sealing performance of the fire damper can be significantly improved, and even in the face of complex air duct structures, it can effectively prevent the leakage of smoke and flames. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of the multi-blade fire damper according to the first embodiment of the present utility model;

[0028] Figure 2 It is an internal view of the multi-blade fire damper according to the first embodiment of the present utility model;

[0029] Figure 3 It is a top view of the multi-blade fire damper according to the first embodiment of the present utility model;

[0030] Figure 4 It is a top view of the connecting rod in the multi-blade fire damper according to the second embodiment of the present utility model;

[0031] Figure 5Top view of the multi - blade fire damper in the open state of the second embodiment of the present utility model;

[0032] Figure 6 Front view of the multi - blade fire damper of the second embodiment of the present utility model;

[0033] Figure 7 Top view of the multi - blade fire damper in the closed state of the second embodiment of the present utility model;

[0034] Figure 8 Schematic structural diagram of the connecting rod of the multi - blade fire damper of the second embodiment of the present utility model

[0035] Figure 9 Schematic structural diagram of the multi - blade fire damper of the second embodiment of the present utility model.

[0036] Explanation of reference numerals

[0037] 1. Fire damper frame; 11. Groove; 12. Sealing wall; 13. First sealing gasket; 2. Fire prevention device; 21. First fire prevention module; 211. First fire prevention blade; 212. First rotating shaft; 22. Second fire prevention module; 221. Second fire prevention blade; 222. Second rotating shaft; 223. Connecting rod; 23. Second sealing gasket; 24. Third sealing gasket; 3. Holding device; 31. Docking head; 32. Thermal fuse; 4. Fire prevention spring. Detailed implementation manners

[0038] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0039] The following illustrates the implementation manners of the present utility model through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0040] It should be noted that the following describes various aspects of embodiments within the scope of the appended claims. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present utility model, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. In addition, this device can be implemented and this method can be practiced using other structures and / or functions in addition to one or more of the aspects set forth herein.

[0041] Moreover, in the description of this specification, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. In this application, the fire-facing surface is the side of the first fireproof blade 211 and the second fireproof blade 221 designed to contact the flame in case of a fire, the back-fire surface is the side of the first fireproof blade 211 and the second fireproof blade 221 designed not to contact the flame in case of a fire, and the peripheral surface is the side of the first fireproof blade 211 and the second fireproof blade 221 that is in close contact with the inner wall of the fire damper frame 1; for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances, and it should not be construed as a limitation to the present utility model.

[0042] In order to achieve the fireproof effect, the fire dampers in the prior art all adopt a fireproof structure with single blades or multiple blades. However, the multi-blade fire dampers have a slow closing response and poor sealing performance. Under such circumstances, how to be able to use only multi-blade fire dampers with interlocking closing and good sealing performance has become an urgent problem in the industry.

[0043] Based on this, the embodiments of this specification propose a solution for a multi-blade fire damper: this solution uses a fireproof spring 4 and a connecting rod 223 to achieve the interlocking closing of multiple blades.

[0044] Figures 1 - 3The following is a schematic structural diagram of a multi - blade fire damper according to the first embodiment of the present utility model, including: a fire damper frame 1, a fire prevention device 2, a holding device 3 and an elastic device. The fire prevention device 2 includes a first fire prevention module 21. The first fire prevention module 21 includes two first fire prevention blades 211, and the two first fire prevention blades 211 are rotatably connected through a first rotating shaft 212. The holding device 3 includes a fusing module and docking heads 31. The docking heads 31 are respectively arranged on the first fire prevention blades 211, and the positions of the two docking heads 31 correspond to each other. The first fire prevention blades 211 are kept closed by the fusing module between the two docking heads 31. When the fusing module is melted by high temperature, the first fire prevention blades 211 are folded towards the closed position through the elastic device, so that the first fire prevention blades 211 are attached to the fire damper frame 1.

[0045] In a preferred embodiment, grooves 11 are provided on both the inner wall and the outer wall of the fire damper frame 1. The grooves 11 are arranged along the circumferential direction of the fire damper frame 1 and are filled with intumescent fire - proof materials. The intumescent fire - proof materials will expand rapidly under high - temperature conditions, fill the grooves 11 and form a dense fire - proof barrier.

[0046] It should be noted that when the grooves 11 are provided on the outer wall of the fire damper frame 1, a sealing wall 12 is formed corresponding to the inner wall of the grooves 11. In the closed state of the fire damper, the back - fire surface of the first fire prevention blade 211 is closely attached to the sealing wall 12. When the grooves 11 are provided on the inner wall of the fire damper frame 1, in the closed state of the fire damper, the circumferential surface of the first fire prevention blade 211 is closely attached to the sealing wall 12. It should be understood that forming a sealing wall 12 corresponding to the inner wall of the grooves 11 is only a preference. When the fire damper frame 1 is thick enough, the inner wall may not be provided with a sealing wall 12, and only the outer wall is provided with grooves 11.

[0047] In a preferred embodiment, a first sealing gasket 13 is further provided on the outer wall of the fire damper frame 1 to ensure the seal between the fire damper and the air duct. Under normal circumstances, the blades of the fire damper remain in the open state, and air can flow through the fire damper frame 1. The first sealing gasket 13 ensures the tight connection between the fire damper and the air duct system and prevents air leakage. The first sealing gasket 13 can be made of high - temperature - resistant rubber or intumescent fire - proof materials.

[0048] In this solution, the seal between the fire damper and the air duct is further ensured through the first sealing gasket 13. Under high - temperature or fire conditions, the good sealing performance of the first sealing gasket 13 can prevent flames, smoke and harmful gases from leaking through the air duct connection, ensuring that the fire damper can effectively block the spread of the fire source.

[0049] Figures 4 - 9The figure shows a schematic structural diagram of a multi - blade fire damper according to the second embodiment of the present utility model. Compared with the first embodiment, the multi - blade fire damper of the second embodiment further includes a connecting rod 223, and the fire prevention device 2 further includes two second fire prevention modules 22; the second fire prevention module 22 includes at least two second fire prevention blades 221, a second rotating shaft 222 and a connecting rod 223. The second fire prevention blades 221 are connected to the connecting rod 223 and the fire damper frame 1 through the second rotating shaft 222, and the second rotating shaft 222 is connected to the first rotating shaft 212 through the connecting rod 223; an elastic device is provided at the first rotating shaft 212; when the fusing module is melted by high temperature, the first fire prevention blade 211 is folded towards the closed position through the elastic device, and the second rotating shaft 222 is driven to rotate through the connecting rod 223 to fold the second fire prevention blade 221 towards the closed position, so that the first fire prevention blade 211 and the second fire prevention blade 221 are attached to the fire damper frame 1.

[0050] In this solution, since multiple fire prevention blades are closed simultaneously, the sealing performance of the fire damper is significantly improved; during a fire, the synchronous action of the connecting rod 223 effectively prevents the passage of flames and smoke, improves the overall fire prevention efficiency, and ensures that the fire damper can form a solid barrier to block the spread of fire; through one active action (such as the breakage of a fusing mechanism), all blades can respond simultaneously, avoiding the complexity of closing each blade one by one; it not only simplifies the operation process of the fire damper, but also improves the reliability and response speed of the system, ensuring that the fire prevention system can quickly play a role in an emergency; the interlocking closing mechanism ensures that the fire prevention blades can closely adhere to the fire damper frame 1 when closed, reducing possible gaps and leakage points, which helps the fire damper provide a better isolation effect during a fire and further improves the overall protection ability of the fire damper.

[0051] In a preferred embodiment, second sealing gaskets 23 are provided at the first rotating shaft 212 and the second rotating shaft 222; third sealing gaskets 24 are circumferentially arranged around the first fire prevention blade 211 and the second fire prevention blade 221; both the second sealing gaskets 23 and the third sealing gaskets 24 are preferably made of expandable fire - proof materials. When exposed to high temperature, the expandable fire - proof materials will rapidly expand to fill the gaps between the frame and the fire prevention device 2, enhancing the sealing effect.

[0052] In this solution, the sealing performance of the fire damper in the closed state is ensured by the provision of the second sealing gasket 23 and the third sealing gasket 24; and by providing an expanded graphite layer on the surfaces of the first fire blade 211 and the second fire blade 221, the conduction of heat through the first fire blade 211 and the second fire blade 221 can be effectively reduced, the temperature behind the first fire blade 211 and the second fire blade 221 is lowered, thereby protecting other building structures and equipment from high-temperature damage; at the same time, the expansion effect of the expanded fireproof layer at high temperatures can improve the structural stability of the fire blades, help the fire blades maintain stability during a fire, and prevent them from deforming or failing due to high temperatures.

[0053] In a preferred embodiment, the fusing module includes a thermal fuse 32, and the elastic device includes a second fire spring 4; when the temperature exceeds the set value, the thermal fuse 32 melts, releasing the fixation of the connector 31, and the first fire blade 211 is released by the elastic force of the second fire spring 4. After the first fire blade 211 is released, it unfolds and adheres to the fire damper frame 1, the second sealing gasket 23, and the third sealing gasket 24.

[0054] In a specific embodiment, the multi-blade fire damper is used for fire prevention at the terminal air outlet. The fire damper frame 1 is made of a refractory alloy (galvanized carbon steel), coated with a high-temperature resistant coating on the outside, and an intumescent fireproof material is coated on the inner and outer walls of the frame. When exposed to high temperatures, the intumescent fireproof material will rapidly expand, filling the gaps between the fire damper frame 1 and the fire blades, enhancing the sealing effect; the multi-blade fire damper in this embodiment is provided with two main fire blade systems, namely the first fire blade 211 and the second fire blade 221; each group of fire blades is connected to the fire damper frame 1 through its own rotating shaft, and the first fire blades 211 are rotatably connected to each other through the first rotating shaft 212; the second fire blade 221 is connected to the fire damper frame 1 through the second rotating shaft 222, and at the same time is connected to the first rotating shaft 212 through a connecting rod 223 to form a linkage structure; the fire-facing surface and the back-fire surface of the first fire blade 211 and the second fire blade 221 are both covered with an expanded graphite layer, which expands at high temperatures to enhance the fire resistance and sealing performance of the blades.

[0055] The holding device 3 of the fireproof blade includes a fusing mechanism and two docking heads 31; the docking heads 31 are respectively installed on two first fireproof blades 211 and are corresponding to each other in position; the fusing mechanism selects a thermal fuse 32, and the thermal fuse 32 is connected between the two docking heads 31. When the temperature exceeds the set value, the thermal fuse 32 fuses, releasing the fixation of the docking heads 31 and enabling the first fireproof blade 211 to be released; since a second fireproof spring 4 is provided at the first rotating shaft 212, the second fireproof spring 4 is usually in a compressed state; when the fusing mechanism fuses, the second fireproof spring 4 quickly returns to its original state and pushes the first fireproof blade 211 to rotate in the closing direction. The second fireproof blade 221 is driven to close synchronously through the connecting rod 223, ensuring the rapid closing of the entire fireproof gate.

[0056] The working principle of the present utility model is as follows: Under normal circumstances, the blades of the multi-blade fireproof gate remain in the open state, and air can flow through the fireproof gate frame 1. The first sealing gasket 13 ensures the tight connection between the fireproof gate and the air duct system, preventing air leakage.

[0057] When the temperature in the ventilation system rises to the set temperature of the fusing mechanism, the thermal fuse 32 of the fusing mechanism fuses, and the fireproof blade quickly closes under the action of the elastic device. At the same time, the intumescent fireproof material in the grooves 11 on the inner and outer walls of the frame quickly expands at high temperature, filling the grooves 11 and further enhancing the sealing effect of the frame.

[0058] While the fireproof blade is closing, the dual actions of the intumescent fireproof material and the frame form a closed fireproof barrier to prevent the spread of flames, smoke, and high temperature. The first sealing gasket 13 ensures that the connection between the air duct and the fireproof gate also has good sealing performance and is not affected by the expansion material.

[0059] In this specification, the same or similar parts among the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments; in particular, for the embodiments described later, the description is relatively simple, and the relevant parts can refer to the partial description of the foregoing embodiments. For example, the second fireproof blade in the second embodiment is correspondingly closely attached to the sealing wall.

[0060] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A multi-blade fire damper, characterized in that, Comprising: A fire damper frame body; A fire prevention device provided in the fire damper frame body, the fire prevention device comprising at least one first fire prevention module, the first fire prevention module comprising two first fire prevention blades and a first rotating shaft, and the two first fire prevention blades being rotatably connected by means of the first rotating shaft; A holding device, the holding device comprising a fusing module and two docking heads, the two docking heads being respectively provided on the two first fire prevention blades, and the positions of the two docking heads corresponding to each other; the two first fire prevention blades being held closed by the fusing module between the two docking heads; An elastic device, the elastic device being provided at the first rotating shaft, and the elastic force of the elastic device driving the first fire prevention blades to close.

2. The multi-blade fire damper according to claim 1, characterized in that, Further comprising at least one second fire prevention module, the second fire prevention module comprising at least one second fire prevention blade, a second rotating shaft and a connecting rod, the second fire prevention blade being connected to the connecting rod and the fire damper frame body by means of the second rotating shaft, and the second rotating shaft being connected to the first rotating shaft by means of the connecting rod.

3. The multi-blade fire damper according to claim 1, characterized in that, A groove is circumferentially provided on the inner wall and / or outer wall of the fire damper frame body, and the groove is filled with an intumescent fireproof material.

4. The multi-blade fire damper according to claim 3, characterized in that, A groove is circumferentially provided on the outer wall of the fire damper frame body, a sealing wall is provided on the inner wall of the fire damper frame body corresponding to the position of the groove, and the first fire prevention blade and the second fire prevention blade are in close contact with the sealing wall when closed.

5. The multi-blade fire damper according to claim 4, characterized in that, A first sealing gasket is circumferentially provided on the outer wall of the fire damper frame body, and the first sealing gasket is arranged at an interval from the groove.

6. The multi-blade fire damper according to claim 2, wherein, A second sealing gasket is provided at the first rotating shaft and / or the second rotating shaft.

7. The multi-vane fire damper according to claim 6, characterized in that, A third sealing gasket is provided around the circumferences of the first fire prevention blade and the second fire prevention blade.

8. The multi-blade fire damper according to claim 7, characterized in that, An expanded graphite layer is provided on the fire-facing surface and the back-fire surface of at least one of the first fire prevention blade and / or the second fire prevention blade.

9. The multi-blade fire damper according to claim 1, characterized in that, The fusing module comprises a thermal fuse and a first fire prevention spring, and the thermal fuse is connected to the docking head by means of the first fire prevention spring.

10. The multi - blade fire damper according to any one of claims 1 - 9, characterized in that, The elastic device comprises at least one second fire prevention spring.

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