JP2014102037A - Fire damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire damper capable of surely suppressing occurrence of a malfunction.SOLUTION: A fire damper includes a casing having a sheath pipe inwardly projecting, a blade arranged in the inside of the casing, a shaft for supporting the blade, and a stopper arranged on the outside of the casing and connected to the shaft. The stopper includes a rod-like member in which the vicinity of one end thereof is connected to the shaft, and a heat-sensitive member connected to the other end of the rod-like member and inserted into the sheath pipe so that at least a part thereof is brought into contact with the sheath pipe. When the heat-sensitive member is heated and an area of the heat-sensitive member connected to the rod-like member is separated from a part stored in the sheath pipe, the blade is turned to a direction to close the casing by the blade.

Description

  The present invention relates to a fireproof damper provided in an air flow path in a building.

  In the air flow path such as a duct that connects rooms between buildings, if a fire or the like occurs in one room, the duct should be installed when a fire is detected so that smoke does not go to the other room through the air flow path. There is a fire damper to close.

  In Patent Document 1, a cylindrical main body casing, a blade pivotally supported in the main body casing to open and close a flow path in the main body casing, an opening / closing mechanism for opening and closing the blade, When an elastic mechanism that urges in the closing direction and an openable / closable inspection port opened in the main body casing, the urging force of the elastic mechanism is moored at a position facing the inspection port in the main body casing, and the set temperature is reached. A fireproof damper provided with a heat sensitive member for releasing the mooring is described. The fireproof damper described in Patent Document 1 supports the heat-sensitive member with the blades open. In the fire-proof damper, the heat-sensitive member is melted by heat at the time of occurrence of a fire or the like, so that the force supported in the state where the blade is opened is lost, and the blade is closed by the force urged by the elastic mechanism. Thereby, the fireproof damper closes the set flow path (duct), and can suppress that a flame and smoke reach other rooms through the flow path.

  Patent Document 2 describes a heat-sensitive device for a fireproof damper that coats a metal heat-sensitive part (temperature fuse) with a resin film.

JP 2007-78213 A JP 2004-347140 A

  Various buildings are assumed as the building where the fire damper is installed. For example, it may be installed in an outdoor structure installed near the sea or near the coast. At this time, in the case where outside air accompanied by salt is taken in from the outside, there is a concern that the thermal fuse exposed inside the casing is corroded by salt damage. A similar problem arises when a fire damper is installed inside a duct through which air containing chemical substances (acid or alkali) such as nitric acid mist flows. On the other hand, in Patent Document 2, it is said that corrosion resistance can be improved while maintaining thermal sensitivity by coating a thermal fuse with a resin film. However, even if the thermal fuse is coated with a resin film, the corrosion resistance may not be sufficient, or the temperature sensitivity may decrease, so it may not work or should not work in a situation where it should work. Malfunction may occur.

  This invention is made | formed in view of the above, Comprising: It aims at providing the fireproof damper which can suppress generation | occurrence | production of malfunction more reliably.

  In order to solve the above-described problems and achieve the object, a fire damper according to the present invention includes a casing having a sheath tube protruding inside, a blade disposed inside the casing, and a shaft that supports the blade. And a stopper disposed outside the casing and connected to the shaft, the stopper having a bar-like member connected to the shaft in the vicinity of one end, and the other end of the bar-like member A heat-sensitive member that is inserted into the sheath tube and at least part of which is in contact with the sheath tube, the heat-sensitive member is heated, and the region connected to the rod-shaped member of the heat-sensitive member is When the blade is separated from the portion accommodated in the sheath tube, the blade is rotated in a direction to close the casing with the blade.

  The heat sensitive member is preferably formed of a low melting point alloy.

  Moreover, it is preferable that the said sheath pipe | tube is formed with the same material as the said casing.

  Moreover, it is preferable to further have a biasing member that biases the blade in a direction in which the casing is closed with the blade.

  The fireproof damper according to the present invention can improve the corrosion resistance while maintaining the temperature sensitivity, and has the effect of more reliably suppressing the occurrence of malfunction.

FIG. 1 is a schematic diagram showing a schematic configuration of a building including a fireproof damper according to the present invention. FIG. 2 is a top view showing a schematic configuration of a duct provided with a fire damper according to an embodiment of the present invention. FIG. 3 is a side view showing a schematic configuration of a duct in which the fireproof damper shown in FIG. 2 is installed. FIG. 4 is a perspective view showing a schematic configuration of the fireproof damper shown in FIG. FIG. 5 is a perspective view showing the relationship between the sheath and the thermal fuse of the fireproof damper shown in FIG. FIG. 6 is an explanatory diagram for explaining the operation of the fireproof damper shown in FIG. 2. FIG. 7 is a perspective view showing a schematic configuration of a fireproof damper according to another embodiment. FIG. 8 is a perspective view showing a schematic configuration of a fireproof damper according to another embodiment. FIG. 9 is a side view showing a schematic configuration of a fireproof damper according to another embodiment.

  Hereinafter, an embodiment of a fireproof damper according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a schematic diagram showing a schematic configuration of a building including a fireproof damper according to the present invention. The building 10 includes a room 12, a room 14, and a duct 16.

  The rooms 12 and 14 are spaces formed inside the building 10. The duct 16 is a pipe, and has one end connected to the room 12 and the other end connected to the room 14. The duct 16 connects the room 12 and the room 14. Accordingly, the building 10 is in a state where air can flow between the room 12 and the room 14 via the duct 16. The duct 16 is divided into two, a duct 16a and a duct 16b. Although the duct 16 of this embodiment is separated into two for convenience of explanation, the duct 16a and the duct 16b may be further divided into a plurality of parts, and the divided pipes may be connected. The duct 16 is provided with a fireproof damper 20 between the duct 16a and the duct 16b. The fire damper 20 will be described later.

  Here, the building 10 shown in FIG. 1 shows only two rooms 12 and 14 and one duct 16 connecting the two rooms 12 and 14, but the number is not particularly limited. A large number of rooms 12 and 14 may be provided and connected by respective ducts 16. The building 10 is not limited to connecting the room 12 and the room 14 with the duct 16. The building 10 may connect the outside of the building 10 and a room with a duct 16. The building 10 can circulate various gases through the duct 16. For example, outside air may be circulated through the duct 16, and fluid used for various treatments may be circulated through the duct 16.

  Hereinafter, the fire damper 20 will be described with reference to FIGS. FIG. 2 is a top view showing a schematic configuration of a duct provided with a fire damper according to an embodiment of the present invention. FIG. 3 is a side view showing a schematic configuration of a duct in which the fireproof damper shown in FIG. 2 is installed. FIG. 4 is a perspective view showing a schematic configuration of the fireproof damper shown in FIG. FIG. 5 is a perspective view showing the relationship between the sheath and the thermal fuse of the fireproof damper shown in FIG. FIG. 6 is an explanatory diagram for explaining the operation of the fireproof damper shown in FIG. 2. In the example shown in FIGS. 2 to 6, it is assumed that gas is flowing in the direction of arrow A in the ducts 16 a and 16 b and the fire damper 20. The gas may flow in the opposite direction to the direction of the arrow A in the ducts 16 a and 16 b and the fire damper 20. 2 to 4 show a state in which the fire damper 20 is not operating (fire is not detected). FIG. 6 shows a state in which the fire damper 20 is operating (fire is detected).

  As described above, the fire damper 20 is disposed between the duct 16a and the duct 16b, and connects the duct 16a and the duct 16b. That is, the gas flowing through the duct 16 flows in the order of the duct 16a, the fireproof damper 20, and the duct 16b. The fireproof damper 20 includes a casing 22, a blade 30, a shaft 32, and a stopper 33.

  As with the ducts 16a and 16b, the casing 22 is a pipe through which the gas circulated in the duct 16 flows, and has a cylindrical shape. The casing 22 has one end of a cylinder connected to the duct 16a and the other end connected to the duct 16b. As for the casing 22, the flange is formed in the both ends (upper end and lower end) of a cylinder. The casing 22 is connected to the ducts 16a and 16b by fixing the flange and the facing portions of the ducts 16a and 16b by screwing or welding. The casing 22 is preferably made of stainless steel or galvanized steel plate and has a thickness of 1.5 mm or more. Thereby, the fireproof performance of the casing 22 can be made high.

  The casing 22 is provided with a sheath tube 24. The sheath tube 24 protrudes to the inside, that is, the region where the gas flowing through the duct 16 flows. The sheath tube 24 separates the inside and the outside of the casing 22. Specifically, the sheath tube 24 has a shape without a hole and is connected to the casing 22 without a gap. Thereby, the sheath pipe | tube 24 becomes a shape where the gas inside the casing 22 does not flow out outside. In addition, the sheath tube 24 protrudes the region outside the casing 22 toward the region where the gas flowing through the duct 16 flows. The sheath tube 24 of the present embodiment is formed of the same material as the casing 22. The sheath tube 24 is made of, for example, stainless steel or carbon steel. The sheath tube 24 is preferably formed of stainless steel or a galvanized steel plate in the same manner as the casing 22 and has a thickness of 1.5 mm or more. Thereby, the fireproof performance of the sheath pipe | tube 24 can be made high.

  The blade 30 is a plate-like member disposed inside the casing 22. As shown in FIGS. 2 to 3, the blade 30 has a shape whose outer edge is a circle, and the diameter of the circle is slightly smaller than that of the casing 22. In the state shown in FIGS. 2 to 4 (the state where the blade 30 is not in operation), the blade 30 has a direction in which the surface having the largest plate shape is parallel to the arrow A, that is, parallel to the gas flow in the casing 22. Is arranged in. Thereby, the blade | wing 30 can be made into the state which the gas which flows through the casing 22 flows smoothly in the state which is not act | operating. That is, the flow path resistance in the casing 22 caused by the blades 30 can be reduced. The blades 30 are preferably formed of stainless steel or galvanized steel plate and have a thickness of 1.5 mm or more. Thereby, the fireproof performance of the blade | wing 30 can be made high.

  The shaft 32 is a rod-shaped member that supports the blade 30 in the casing 22. The shaft 32 is supported in a rotatable state. A part of the shaft 32 is exposed to the outside of the casing 22. In the fire damper 20, when the shaft 32 rotates, the blade 30 also rotates integrally with the shaft 32.

  The stopper 33 is disposed outside the casing 22 and includes a rod-shaped member 34 and a thermal fuse (thermal member) 36. One end of the rod-shaped member 34 is fixed to the shaft 32. The thermal fuse 36 is connected to the other end of the rod-shaped member 34. The thermal fuse 36 is a protruding rod-like member on the casing 22 side, and a part on the casing 22 side is inserted into the sheath tube 24. That is, as shown in FIG. 5, in the thermal fuse 36, a region including the end portion on the side not connected to the rod-like member 34 is inserted into the sheath tube 24, and the periphery is surrounded by the sheath tube 24.

  The thermal fuse 36 is a member that melts or bends when a fire or the like occurs and the temperature rises. The thermal fuse 36 is made of, for example, a material having a melting point of about 120 degrees. Here, the thermal fuse 36 is preferably made of a low melting point alloy, specifically, a low melting point alloy suitable for the temperature condition. As the low melting point alloy, various alloys that can be used as thermal fuses for fireproof dampers, such as Sn—Bi—Pb—Cd alloy, Sn—Bi—Pb alloy, Sn—Bi alloy, and Sn—In alloy, can be used. it can. The composition of the alloy forming the thermal fuse 36 is determined by the melting point of the alloy determined by the fire damper operating temperature in the same manner as the temperature fuse of a normal fire damper. The thermal fuse 36 has such rigidity that it is not bent by a load from the rod-shaped member 34 at a predetermined temperature or lower. Further, the thermal fuse 36 has a cross-sectional area in the extending direction that is smaller than the cross-sectional area of the space of the sheath 24. Here, it is preferable that the thermal fuse 36 is in contact with the sheath tube 24 in order to ensure thermal conductivity. In addition, for maintenance or removal, the thermal fuse 36 uses the dimensional difference from the sheath 24 (the dimensional difference of the narrowest part) with the dimensional tolerance and fitting method of JIS B0401-1. It is preferable that the dimensions conform to the “clearance fit” in the fit table.

  The stopper 33 is supported at both ends of a rod-shaped member 34 by a thermal fuse 36 inserted into the shaft 32 and the sheath tube 24, respectively. Thereby, the rod-shaped member 34 is in a state where it cannot rotate around the shaft 32. The stopper 33 is a rod-shaped member in which the rod-shaped member 34 extends in one direction with the shaft 32 as a fulcrum. For this reason, a force in the direction indicated by the arrow 40 acts on the thermal fuse 36 of the rod-shaped member 34. For this reason, the thermal fuse 36 is in a state in which the surface on the lower side in the vertical direction is pressed against the sheath tube 24 and in contact therewith.

  In the fireproof damper 20, when a fire does not occur and the fireproof function is not activated, such as in normal times, the temperature fuse 36 of the stopper 33 is connected to the rod-shaped member 34 and inserted into the sheath tube 24. For this reason, as shown in FIGS. 2 to 4, the blade 30 is held in the casing 22 in a direction that does not easily obstruct the flow of gas.

  Next, when a fire or the like occurs, the temperature of the gas flowing through the casing 22 of the fireproof damper 20 rises. When the temperature of the gas flowing through the casing 22 increases, the fire damper 20 heats the casing 22 and the sheath tube 24. Further, the heat of the sheath tube 24 is transmitted to the thermal fuse 36 inserted in the sheath tube 24. The thermal fuse 36 is heated and transmitted through the sheath tube 24. When the temperature fuse 36 reaches a certain temperature or more, the rigidity is reduced and / or the portion is connected to the rod-shaped member 34 of the thermal fuse 36 due to melting. The sheath 24 is detached. For example, the thermal fuse 36 is melted into a portion 36 a connected to the rod-shaped member 34 and a portion 36 b inserted into the sheath tube 24 as shown in FIG. When the temperature fuse 36 is melted and the portion 36a connected to the rod-shaped member 34 is separated from the portion 36b inserted in the sheath tube 24, the fire-proof damper 20 has no force to support the portion 36b side of the rod-shaped member 34. The force which rotates the rod-shaped member 34 to the arrow 40 side acts. The temperature fuse 36 may be in a state where the portion 36a connected to the rod-shaped member 34 is not inserted into the sheath tube 24, and may be broken into two parts as in this embodiment. The temperature fuse 36 may be deformed and removed from the sheath tube 24, or the portion inserted into the sheath tube 24 may be melted and dropped. The fire damper 20 rotates the shaft 32 and the blade 30 connected to the rod-shaped member 34 by rotating the rod-shaped member 34 90 degrees toward the arrow 40 side. Thereby, the fire damper 20 is in a state where the blades 30 block the flow path through which the gas in the casing 22 flows. The fire damper 20 is configured to block the casing 22 with the blades 30 so that no gas flows from one to the other, that is, the air does not flow between the room 12 and the room 14 via the duct 16. it can.

  Thus, when a fire or the like occurs and a gas having a high temperature starts to flow through the duct 16, the fire damper 20 transfers the heat to the thermal fuse 36 via the sheath 24. Thereafter, when the temperature fuse 36 is heated to a predetermined temperature or higher, the temperature fuse 36 is melted, and the rod-shaped member 34 is not supported by the temperature fuse 36 and the sheath tube 24, and the rod-shaped member 34 and the shaft 32 are caused by its own weight. Then, the blade 30 rotates and the blade 30 closes the casing 22. As described above, the fire damper 20 can prevent gas from flowing through the duct 16 when the thermal fuse 36 detects that a fire or the like has occurred. Thereby, when a fire arises, it can suppress that smoke, a flame, and a harmful substance are transmitted via the duct 16 to the room etc. where the fire does not generate | occur | produce.

  The fire damper 20 is configured such that the temperature fuse 36 is disposed outside the casing 22 and inserted into the sheath tube 24 so that the temperature fuse 36 does not come into contact with the gas flowing in the casing 22. Thereby, it is possible to suppress the thermal fuse 36 from being corroded by the gas flowing in the casing 22. For example, in the gas flowing in the casing 22, the circulated gas is nitrate mist, sea salt particles contained in sea breeze (a kind of aerosol particles contained in the atmosphere, salinity derived from the water of sea or salt lake (sea water)) Even in the case where the fine particles are included, the thermal fuse 36 can be prevented from being corroded by the substance. As a result, the thermal fuse 36 corrodes, breaks or bends, so that the fireproof damper 20 malfunctions. Specifically, the rod-shaped member 34 rotates in a state where no fire has occurred, and the blade 30 The possibility of closing the casing 22 can be reduced. Thus, it can use suitably also in the building which needs to control the flow volume of gas with high precision because generation | occurrence | production of malfunctioning can be suppressed.

  Moreover, the fireproof damper 20 can be installed in the duct 16 for various uses of the building 10. Specifically, the fire damper 20 of the present embodiment has a structure in which the thermal fuse 36 is not exposed to the inside, so that the corrosiveness of the fluid flowing in the duct 16 (the performance of the fluid corroding the thermal fuse) is concerned. A fire damper 20 can be used. That is, the fireproof damper 20 can increase the corrosion resistance and can cope with more fluid. Moreover, since the fire damper 20 does not need to change the resin etc. which coat according to the component of the gas to distribute | circulate, versatility can also be made high. Further, the fireproof damper 20 can have higher corrosion resistance than the case where the thermal fuse 36 is coated with resin by using the sheath tube 24. In addition, the fireproof damper 20 performs the same treatment as the inner peripheral surface of the duct 16 on the inner peripheral surface of the casing 22 and the surface in contact with the fluid to be circulated through the sheath tube 24, thereby improving the corrosion resistance of the fireproof damper 20. Can be improved.

  Further, the fireproof damper 20 can make the temperature fuse 36 more easily deformed by contacting the temperature fuse 36 with the sheath 24 than coating the temperature fuse 36 with resin. Specifically, since the thermal fuse 36 is in a movable state while being in contact with the sheath tube 24, it can be deformed inside the sheath tube 24. Thereby, it can suppress that a state will be maintained with the rigidity of resin at the time of a temperature rise, and responsiveness can be made high.

  Further, the fire damper 20 can appropriately transfer the heat of the gas inside the casing 22 to the temperature fuse 36 by bringing the temperature fuse 36 into contact with the sheath 24. Thereby, it is possible to improve the corrosion resistance while maintaining the heat transfer efficiency of the heat of the gas inside the casing 22 higher than when the thermal fuse 36 is coated with resin. Further, the thermal fuse (heat sensitive member) 36 is preferably formed of a low melting point alloy as described above, but is not exposed to an air current. Therefore, like the conventional corrosion-resistant fireproof damper, the thermal fuse 36 is resistant to corrosion. Corrosion can be suppressed without applying a coating for. The fire damper 20 preferably sets the melting point of the thermal fuse 36 based on the thermal conductivity from the sheath 24 to the thermal fuse 36 and the gas temperature at which it is determined that a fire has occurred. Thereby, the occurrence of a fire can be detected more accurately.

  The fire-proof damper 20 prevents the rod-shaped member 34 from rotating further to the position of the rod-shaped member 34 when the blade 30 moves to the position to close the casing 22 so that the blade 30 is supported at the position where the casing 22 is closed at the time of operation. It is preferable to provide a restricting member for restricting to the above.

  The fire damper 20 of the present embodiment has a shape in which a single blade 30 closes the gas flow path of the casing 22, that is, the outer edge of the blade 30 is the same as or slightly smaller than the inner edge of the casing 22. It is not limited to. The fire damper 20 may block the gas flow path of the casing 22 with a plurality of blades. In this case, the fire damper may be operated by interlocking a plurality of blades with one stopper, or may be provided with a stopper independently for each blade. Further, as in the present embodiment, the blade 30 preferably has an outer edge shape that is substantially the same as the inner edge of the casing, but the duct 16 is formed to such an extent that flames and smoke cannot substantially pass through the duct 16. Any shape that can be closed is acceptable.

  Although the fireproof damper 20 of the said embodiment was demonstrated as a case where it provided in the cylindrical duct, the shape of the casing of a duct and a fireproof damper is not limited to this. Hereinafter, another embodiment of the fireproof damper will be described with reference to FIG.

  FIG. 7 is a perspective view showing a schematic configuration of a fireproof damper according to another embodiment. The fireproof damper 120 has a shape in which the casing 122 has a hollow square (rectangular) cross section. The blades 130 of the fire damper 120 have a rectangular (rectangular) shape similar to (similar to) the shape of the inner surface of the casing 122. The fire damper 120 closes the duct in which the fire damper 120 is installed by closing the square casing 122 with the square blades 130 during operation, that is, prevents air from flowing. As described above, the fire damper 120 can correspond to various shapes by matching the shape of the blade 130 with the shape of the casing 122.

  The fireproof damper preferably includes a biasing member that biases the blade in a direction to close the casing with the blade (giving torque). As an urging member, for example, there is a member that urges the stopper in the direction of closing the blade. By providing the urging member, the fire damper can close the rod-like member that rotates the blade more reliably and with a greater force when the temperature fuse is melted and the function of the stopper is lost. Hereinafter, an example of a specific configuration will be described with reference to FIGS. 8 and 9.

  FIG. 8 is a perspective view showing a schematic configuration of a fireproof damper according to another embodiment. The fireproof damper 220 shown in FIG. 8 is the same as the fireproof damper 20 of the above embodiment except for the point that the biasing member 250 is provided. Hereinafter, the points peculiar to the fire damper 220 will be described in a filling manner. The urging member 250 is a spring and is disposed inside the shaft 32. The biasing member 250 has one end 251 a connected to the shaft 32 and the other end 251 b connected to the casing 22. Each end portion of the biasing member 250 is fixed in a twisted state, and applies a moment in the direction indicated by the arrow 252 to the shaft 32.

  In the fire damper 220, a force is applied to the shaft 32 in the direction of the arrow 252 by the biasing member 250. As a result, when the thermal fuse 36 is removed from the sheath tube 24, the blade 30 is rotated by the force applied to the shaft 32 by the biasing member 250 in addition to the moment of the rod-shaped member 34. Thereby, the blade | wing 30 is rotated by force stronger than the closed state. The fire damper 220 also prevents the rod-shaped member 34 from rotating further to the position of the rod-shaped member 34 when the blade 30 moves to the position to close the casing 22 so that the blade 30 is supported at the position to close the casing 22. It is preferable to provide a restricting member for restricting to the above.

  FIG. 9 is a side view showing a schematic configuration of a fireproof damper according to another embodiment. The fire prevention damper 320 shown in FIG. 9 is the same as the fire prevention damper 20 of the above embodiment except for the point that the biasing member 350 is provided. Hereinafter, the points peculiar to the fire damper 320 will be described in a filling manner. The biasing member 350 includes an elastic member 352 and a support portion 354. The elastic member 352 is a spring or the like, and one end portion 352 a is connected to the end portion of the rod-shaped member 34 on the temperature fuse 36 side, and the other end portion 352 b is connected to the support portion 354. The elastic member 352 has its ends fixed in a pulled state, and applies a force in the direction indicated by the arrow 356 to the rod-shaped member 34. Further, the support portion 354 is disposed at a position farther from the thermal fuse 36 than the shaft 32 and on the side where the rod-shaped member 34 rotates. That is, the urging member 350 has the support portion 354 disposed at a position where the arrow 356 is in the same direction as the arrow 40 as a moment applied to the rod-shaped member 34.

  The fire damper 320 is applied with force to the shaft 32 in the direction of the arrow 356 by the biasing member 350. Thus, when the thermal fuse 36 is removed from the sheath tube 24, the blade 30 is rotated by the force applied to the shaft 32 by the biasing member 350 in addition to the moment of the rod-shaped member 34. Thereby, the blade | wing 30 is rotated by force stronger than the closed state. The fire damper 320 also prevents the rod-shaped member 34 from rotating further to the position of the rod-shaped member 34 when the blade 30 moves to the position to close the casing 22 so that the blade 30 is supported at the position to close the casing 22. It is preferable to provide a restricting member for restricting to the above.

  The configuration of the urging member is not limited to the above embodiment, and various mechanisms that urge the blades in the closing direction when the thermal fuse 36 is removed from the sheath 24 can be used.

DESCRIPTION OF SYMBOLS 10 Building 12, 14 Room 16, 16a, 16b Duct 20, 120 Fireproof damper 22 Casing 24 Sheath pipe 30, 130 Blade 32 Shaft 33 Stopper 34 Rod-shaped member 36 Thermal fuse 36a, 36b Portion 40 Arrow

Claims (4)

A casing having a sheath tube protruding inside,
A blade disposed inside the casing;
A shaft that supports the blade;
A stopper disposed outside the casing and connected to the shaft,
The stopper has a rod-like member whose one end portion is connected to the shaft;
A heat-sensitive member connected to the other end of the rod-shaped member and inserted into the sheath tube, at least a part of which is in contact with the sheath tube, the heat-sensitive member is heated, and the rod-shaped member of the heat-sensitive member When the area | region connected to a member remove | deviates from the part accommodated in the said sheath pipe | tube, the said blade is rotated in the direction which closes the said casing with the said blade | wing, The fire prevention damper characterized by the above-mentioned.   The fireproof damper according to claim 1, wherein the heat sensitive member is formed of a low melting point alloy.   The fireproof damper according to claim 1 or 2, wherein the sheath pipe is made of the same material as the casing.   The fireproof damper according to any one of claims 1 to 3, further comprising a biasing member that biases the blade in a direction in which the casing is closed with the blade.

Images