JP3500306B2 - Fire damper and trigger mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof damper, particularly to a fireproof damper suitable for two pipe lines, and a trigger mechanism used for the fireproof damper.

[0002]

2. Description of the Related Art Japanese Utility Model Laid-Open No. 61-103156 discloses a fireproof damper using a shape memory alloy spring as a temperature detecting element. As shown in FIG. 8, this one has one circular shield plate (blade) 110 in a cylindrical duct (casing) 111, in a state parallel to the center line (perpendicular to the paper surface) and in a state perpendicular to the center line. Rotatably provided between the shield plate 11
0 is provided with a torsion coil spring 112 for constantly urging the duct 111 toward the side where the duct 111 is closed, and a trigger device 113 for maintaining the shielding plate 110 in a parallel state is provided in the duct 1.
It is attached so as to penetrate 11. Reference numeral 111a,
111b is a stopper of the shielding plate 110.

The trigger device 113 includes a duct 111.
Of the actuating shaft 114 slidably provided in the radial direction, an actuating spring 115 for constantly biasing the actuating shaft inward in the radial direction (arrow K), and a plate-like member engaging with a pin 116 fixed to the actuating shaft 114. And a shape memory alloy spring 118 for disengaging the stopper 117 at high temperature. Also, the arm 120 is attached to the rotary shaft 119 integrated with the shield plate 110.
Is provided so that the arm engages with the tip of the operating shaft 114.

In this fireproof damper, the shape memory alloy spring 118 extends at a high temperature to push up the stopper 117 and disengage the engagement with the pin 116. As a result, the operating shaft 114
Is urged to the right by the urging force of the actuation spring 115, and the tip of the actuation shaft is pulled in. Therefore, the arm 120 engaged with the tip of the actuating shaft 114 is disengaged, and the shield plate 110 is stopped by the biasing force of the torsion coil spring 112.
The duct 111 is rotated until it comes into contact with b, and the duct 111 is closed. On the other hand, in Japanese Unexamined Patent Publication No. 7-16306, the operating shaft is locked against the biasing force of the operating spring by the engagement of the ball and the groove.
There is disclosed a trigger device of a type that releases a locked state by a restoring force of a shape memory alloy spring.

[0005]

The above-mentioned conventional fire damper is suitable for shielding one pipe line, but it is for a so-called two pipe line in which ducts from two places, for example, a bathroom and a toilet are combined into one. If it is used for the duct of, it will be too large because it requires two sets. Further, even if the size is reduced as it is, the rotating shaft 119 of the shielding plate 110 cannot be made so thin, and therefore the air circulation area tends to be small.
Further, the trigger device disclosed in Japanese Patent Laid-Open No. 7-16306 cannot be made so small. An object of the present invention is to provide a compact and easy-to-install fireproof damper, which is suitable as a fireproof damper for a duct for two pipelines. Furthermore, it is a technical object of the present invention to provide a trigger mechanism using a shape memory alloy spring, which is suitable for such a small fireproof damper and has a simple structure.

[0006]

Means for Solving the Problems A fireproof damper of the present invention includes a tubular casing, a blade whose one end is rotatably attached to the inner surface of the casing so as to open and close the casing, and the blade is closed. Means for urging in the direction, and rotatably provided behind the blades in the casing,
In the casing, there are provided blade operating means for operating the blade to an open position, and an operating member that operates between a state where the blade operating means is locked at the blade open position and a state where the blade is unlocked. The basic configuration is that the trigger mechanism has a temperature actuating element that actuates the actuating member to the unlocked position when the temperature rises above a predetermined temperature.

In the first aspect of the fire damper of the present invention , in this basic structure, the blade operating means is an operation shaft rotatably provided on a bearing provided in the casing, and the operation shaft thereof. An operating arm that extends from the tip of the blade toward the blade and that opens and closes the blade according to the rotation of the operating shaft, and a stopper arm that is provided at the base end outside the casing and that engages with the operating member of the trigger mechanism. It is characterized by having and .

The second aspect of the fire damper of the present invention (claim)
Item 2) is, in the basic configuration, further includes a return spring in which the trigger mechanism urges the actuating member in the direction of the locking state at all times, and a pulling force is weak at normal temperature, and the spring force is recovered at a temperature higher than a predetermined temperature. and characterized by comprising a shape memory alloy spring which pulls in the direction to release the engagement of the actuating member and
I am doing .

A third aspect of the fire damper of the present invention (claim)
Item 3) is a so-called two-pipe fire protection damper, wherein in the basic configuration, the casing is divided into two adjacent ducts by a partition plate extending in the axial direction, and the blades are provided in each duct. A blade urging means, a blade operating means, and a trigger mechanism are provided.

The trigger mechanism (claim 4 ) of the present invention is
A trigger mechanism used for a fireproof damper, a cylindrical holder, and an operating shaft slidably housed in the holder in a state where both ends project from the holder,
A return spring for urging the operating shaft toward the front end, a support piece having one end fixed to the rear edge of the holder and extending rearward of the holder, and a tension piece extending between the rear end of the operating shaft and the support piece. ,
It is characterized by a shape memory alloy spring that has a weak tensile force at normal temperature and recovers a spring force at a temperature higher than a predetermined temperature to pull an operating shaft in a rear end direction against an urging force of a return spring. A fourth aspect of the fire damper of the present invention (Claims)
5 ) has one end rotatably attached to the inner surface of the casing so as to rotate between a rectangular tubular casing and an open position along the inner surface of the casing and a closed position where the casing is closed. Moreover, the blade that is normally elastically urged in the closing direction and the blade that is rotatably provided on the casing have one end abutting against the blade to keep the blade open and the other end outside the casing. An operating arm that projects
It operates between the stopper arm provided on the portion of the operation arm that projects to the outside of the casing, and the projecting state in which the stopper arm is locked at the position where the blade is opened and the retracted state in which the locking is released. In addition, the operating member is always elastically urged in the protruding direction, and when the pulling force is usually weak and the temperature inside the casing rises above a predetermined temperature, the pulling force is restored to operate the operating member. It is characterized in that it is provided with a shape memory alloy spring which is retracted to the unlocked position.

[0011]

In the fire damper of the present invention, one end of the blade is rotatably attached to the inner surface of the casing. Therefore, there is no rotation axis at the center of the casing, which does not hinder the flow of air. Furthermore, it ensures the temperature-sensing action of the temperature-actuated element. As described above, in the fireproof damper of the present invention, since the rotating shaft is not provided in the central portion, the means for opening and closing the blade is provided separately from the rotating center of the blade. However, since the opening / closing operation means does not need to support the blades, it can be easily miniaturized and can be arranged so as not to disturb the circulation of air.

The fire damper of the present invention ( first mode)
The blade operating means has an operating shaft rotatably provided on a bearing provided in the casing, and extends from the tip end side of the operating shaft toward the blade, and opens and closes the blade according to the rotation of the operating shaft. Since it is composed of the operation arm and the stopper arm provided on the base end side outside the casing and engaged with the operation member of the trigger mechanism, the blade operation means can be made thin and simple. it can.

A second aspect of the fire damper of the present invention (claim)
Item 2) is that the trigger mechanism has a return spring that always urges the operating member in the direction of the locking state, and the tensile force is weak at normal temperature, and the spring force recovers at a temperature higher than a predetermined temperature to engage the operating shaft. Since it has a shape memory alloy spring that pulls in the direction to release, the structure of the trigger mechanism is simple and the size can be reduced.

A third aspect of the fire damper of the present invention (claim)
Item 3) can be performed, for example, so that ventilation at two places of the bathroom and the toilet is not mixed with each other, and the ducts can be independently closed at the time of fire.

In the trigger mechanism of the present invention (claim 4) , the pulling force of the shape memory alloy spring is weak at room temperature,
The tip of the operating shaft projects from the holder due to the biasing force of the return spring. When the temperature rises above a predetermined temperature in the duct, such as during a fire, the shape memory alloy spring restores its spring force and pulls the actuating shaft with a stronger force than the return spring. As a result, the tip of the actuating shaft retracts into the holder, and a trigger action is achieved. The tip of the actuating shaft does not have to be completely retracted, but may be retracted within a range where a predetermined action is achieved.

In the above-mentioned trigger mechanism, the return spring and the shape memory alloy spring are arranged on the same axis so as to bias the operation axis in opposite directions, so that the entire structure can be made thin.
Therefore, even if it is arranged so as to cross the central portion of the casing, which is advantageous for temperature detection, it does not disturb the air flow in the casing so much. Further, since the shape memory alloy spring and the return spring act on the same axis, unstable forces such as eccentric force and bending force are unlikely to occur. Therefore, the operation is accurate, and the shape memory alloy spring is hard to be deformed. In the fourth aspect (claim 5 ) of the fireproof damper of the present invention, since the pulling force of the shape memory alloy spring is weak at room temperature, the actuating member projects to lock the stopper arm. Therefore, the operation arm holds the blade open. In this state, the blades are along the inner surface of the casing, so that the air flow is not disturbed.
Then, when the temperature rises, the tensile force of the shape memory alloy spring is recovered, the actuating member is retracted, and the stopper arm is released. This causes the blades to rotate in the direction of closing the casing. After that, when the temperature in the duct drops,
The actuating member projects again due to the biasing force of the return spring. As a result, the operating arm can be operated to open the blade, and the stopper arm can be locked to the operating member to restore the original state.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a fire damper and a trigger mechanism of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway perspective view showing an embodiment of the fireproof damper of the present invention, FIG. 2 is a partially cutaway perspective view showing the shielding state thereof, and FIGS. 3a and 3b are views of the fireproof damper in the state of FIG. Side and front views, Figures 4a and 4b are side and front views of the fire damper in the state of Figure 2, Figures 5a and 5b.
3B and FIG. 4B are vertical cross-sectional views, FIG. 6A and FIG. 6B are partially cutaway plan views and side views showing an embodiment of the trigger mechanism of the present invention, and FIG. 7 is an installation state of the fireproof damper of the present invention. FIG.

The fire damper A shown in FIG. 1 has a rectangular tubular casing 1, rectangular blades 3 rotatably attached to the inner surface of the casing 1 by hinges 2, and a direction in which the blades 3 are opened. Operating rod (blade operating means) for operating
4 and a trigger mechanism 5 for locking the operating rod 4 below a predetermined temperature. As can be seen from FIG. 3b, the fire damper A is a fire damper for two pipes in which two blades 3, 3, two operation rods 4, 4 and two trigger mechanisms 5, 5 are provided in a left and right pair. However, only one side is shown in FIGS. 1 and 2 for simplicity.

The casing 1 includes a pair of box bodies 12 each having a collar portion 11, and a partition plate 13 between the collar portions 11.
And welded together, and the cylindrical connecting portion 14 at the front and rear ends,
15 is welded. The boxes 12, 12, the partition plate 13, and the connecting portions 14, 15 can be manufactured by bending a metal plate such as a steel plate with a press. In the present embodiment, the partition plate 13 is configured by stacking two steel plates, and the grooves 16 that fit into the partition plates of the front and rear ducts are formed at the front end portion and the rear end portion. Further, the shielding position of the blade 3 is determined so that it passes diagonally through the central portion of each steel plate, and a stopper 17 for sealing at the time of shielding is formed by bending (see FIG. 5a). On the other hand, the stoppers 1 made of a plate material bent to have an L-shaped cross section are provided on the upper surface, the side surface, and the lower surface of the inner surfaces of the boxes 12, 12.
8 is attached by welding. The stoppers 17 and 18 may be perpendicular to the duct center.

As shown in FIGS. 3a and 3b, a relatively large opening 20 is formed in the side wall of the casing 1, that is, the portion corresponding to the bottom of each box 12, 12, and the opening 21 is covered. It is covered with a screw and is detachably fixed with a screw 22. The operation rod 4 and the trigger mechanism 5 described above are attached to the cover 21. That is, the end of the cylindrical bearing member 23 that rotatably supports the operation rod 4 is fixed to the cover 21 by welding or the like, and the cylindrical holding member 24 that holds the trigger mechanism 5 is fixed by welding or the like. ing. The cover 21 has an inspection port 2 for observing the inside.
5 are provided. The periphery of the inspection port 25 is surrounded by a cylindrical member 26, and a lid 27 is detachably fitted.

The blade 3 is made of a rectangular steel plate or the like, and one end thereof is rotatably attached to the upper inner surface of the box body 12 by a hinge 2. As a result, the blade 3 is rotatable between a state in which the duct held parallel to the ceiling portion is open as shown in FIG. 1 and a state in which the ducts in contact with the stoppers 17 and 18 are closed as shown in FIG. Is. As shown in FIG. 4b, the hinge 2 is of a type that includes a torsion coil spring 30 and is biased in the normally opening direction.

As shown in FIGS. 1 and 3b, the operating rod 4
Is a bar material bent in an L shape. That is, the operation rod 4 is the side wall of the casing 1 (actually the cover 21 as described above).
A linear operation shaft 4a that is rotatably supported by a bearing member 23 provided at the end of the operation shaft 4a, and an operation arm 4b that is bent substantially at a right angle from the tip of the operation shaft 4a and that can be retracted between the stoppers 17 and 18. To L-shaped. Further, a stopper arm 31 that also serves as an operation handle is attached to the end of the operation shaft 4a, that is, the portion protruding from the bearing member 23 to the outside.

The operating rod 4 can be rotated by gripping the stopper arm 31. When the operation shaft 4a is rotated so that the operation arm 4b faces upward as shown in FIGS. 1 and 5a, the operation arm 4b moves the stopper 1
It comes into contact with the blade 3 through the gap between the blades 7 and 18. When the blade 3 is further rotated, the blade 3 can be pushed up to the vicinity of the ceiling while the free end of the operation arm 4b is in sliding contact with the surface of the blade 3. On the contrary, when the operation arm 4b is turned downward as shown in FIG. 2 and FIG.
It is closed by the urging force of the spring 30. In this way the operating rod 4
Is not directly connected to the blade 3, but the center of rotation of the blade is not aligned with the center of rotation of the blade 3.
It has a function of opening and closing the blade 3 through the operation arm 4b by rotating the blades 7 and 18 from behind.

5a and 5b, the operating arm 4b is bent near its free end. This is the operating rod 4
This is to suppress the fluctuation of the operating force (torque) due to the deviation of the rotation center of the blade 3 to some extent. That is, when the operation rod 4 is rotated clockwise from the state of FIG. 5b,
First, the bent portion 4d contacts the blade 3. When the blade 3 is further rotated from that state, the contact position gradually shifts to the rotation center side of the blade 3. When it is further rotated, the free end of the operating arm 4b then comes into contact with the blade 3, but at that time, it comes into contact with the blade 3 at a position somewhat away from the center of rotation of the blade 3. Then, when the rotation is further continued, the blade 3
It shifts toward the center of rotation. As described above, the contact position of the operation rod 4 with the blade 3 differs depending on the angle, and therefore, there is an advantage that the operation feeling does not fluctuate much.

In the embodiment shown in FIG. 1 and the like, the operation shaft 4a of the operation rod 4 is made considerably long, and the operation arm 4b is provided with the partition plate 1.
Move the fan-shaped range at a position close to 3. But the operating axis 4
It is also possible to shorten a and move the operation arm 4b at a position close to the cover 21. In that case, the bending moment applied to the root portion of the operation shaft 4a can be small. In the above-mentioned embodiment, the free end of the operating arm 4b is configured to simply contact the blade 3, but if desired, a cam member may be attached to the blade 3 and the cam groove or guide groove formed in the cam member may be provided. It may be configured to move.
In that case, since the reciprocating rotation operation of the operation rod 4 corresponds to the rotation of the blade 3, the opening / closing operation is smooth, and the fluctuation of the operation force can be set relatively arbitrarily.

As shown in FIGS. 6a and 6b, the trigger mechanism 5 includes a cylindrical holder 32 and an actuating shaft 33 housed in the holder so as to be slidable in the axial direction. The holder 32 includes a bottomed cylindrical main body 34 and a lid 35 that closes the opening. Through holes 34 a and 35 a are formed in the bottom portion of the main body 34 and the lid 35 to allow the actuating shaft 33 to pass therethrough and slidably support the actuating shaft 33. Lid 3
5 includes a step portion 35 that fits into the opening of the holding member 24 described above.
b is formed, and the holding member 2 is provided around the main body 34.
An O-ring 36, which fits air-tightly, is fitted in the interior of the container 4.
Further, a front end portion of a support piece 37 is fixed near the rear end of the main body 34 of the holder 32. The support piece 37 extends rearward, and its rear end is bent inward in the radial direction.

An E-ring 38 is fixed to the center of the operating shaft 33, and a return spring 39, which is a compression coil spring, is interposed between the E-ring 38 and the bottom of the main body 34 of the holder. The return spring 39 is arranged so as to surround the periphery of the operating shaft 33, and always urges the operating shaft 33 in the tip direction (arrow P).

An extension spring type shape memory alloy spring 40 is stretched between the rear end of the operating shaft 33 and the rear end of the support piece 37 by using a crimping terminal 40a or a screw 40b used for electrical wiring or the like. It is set up. The shape memory alloy spring 40 itself is a conventionally known one, for example, titanium (Ti) 45.4% and nickel (Ni) 54.6.
% Alloy. This material does not exhibit a strong pulling force at room temperature, and the strong pulling force is restored at a predetermined temperature, for example, higher than 70 ° C. Therefore, at normal temperature, the actuating shaft 33 is biased in the rear end direction (arrow Q) with a force weaker than the return spring 39, and at high temperature, the actuating shaft 33 is biased with a stronger force than the return spring 39. Since the shape memory alloy spring 40 is exposed to the outside of the main body 34 of the holder, the temperature inside the duct can be accurately detected. It should be noted that instead of the support piece 37, it can be locked to the inner wall of the casing of the duct. However, for manufacturing and maintenance, the holder 32
It is preferable to hold it in a unit to form a unit.

In the above trigger mechanism 5, when the air passing through the casing 1 is at a predetermined temperature or less, the restoring force of the shape memory alloy spring 40 is weaker than the urging force of the return spring 39.
The return spring 39 biases the actuating shaft 33 toward the tip thereof, and the tip of the actuating shaft 33 largely projects from the lid 35.
In this state, the stopper arm 31 can be locked to the tip of the operation rod 4 as shown in FIG. Then, when the temperature of the air in the duct rises above a predetermined temperature, such as when a fire occurs, the tensile force of the shape memory alloy spring 40 is restored, and the urging force of the return spring 39 is overcome to move the operating shaft 33 back. Pull in the end direction. As a result, the tip of the actuating shaft 33 is pulled into the lid 35, and the stopper arm 31 is unlocked. On the other hand, when the temperature in the duct again decreases from that state, the pulling force of the shape memory alloy spring 40 decreases, and therefore the urging force of the return spring 39 causes the operating shaft 33 to move toward the front end again, and the end of the cover is closed. It largely projects from the body 35.

The biasing force of the return spring 39 does not have to be so strong because it only needs to maintain the protrusion of the actuating shaft 33 at room temperature, that is, against the weak biasing force of the weak shape memory alloy spring 40. Good. Rather, the shape memory alloy spring 40 is weakened to some extent so as not to interfere with the operation of the shape memory alloy spring 40. Therefore, it may be weak enough to return the operating shaft 33 to the original state. In that case, the operating shaft 33 is restored to its original position by a manual operation.

Next, a method for installing the fireproof damper A having the above-described structure and a method for operating and operating the whole will be described.
As shown in FIG. 7, the fireproof damper A is hung on a ceiling or the like by using a hanging bolt 43. Then, the other two duct type ducts 44 and 45 are connected to the front and rear connecting portions 14 and 15. The ducts 44 and 45 also have a partition plate in the center. Reference numeral 46 in FIG. 7 is a two-pipe type vent cap or pipe hood, reference numeral 47 is backfilling mortar, and reference numeral 48 is a waterproofing material.

The fire damper A holds the blades 3 in a state in which the blades 3 are in contact with the upper surface of the casing 1 as shown in FIG. The blade 3 is raised to the above-mentioned position by rotating the operating rod 4, and the operating rod 4 is held at that position.
1 is locked to the tip of the operating shaft 33 of the trigger mechanism 5. As described above, the operating shaft 33 is manually operated or the return spring 3 is used.
The stopper arm 31 is made to project by the biasing force of 9, and is somewhat retracted only when the stopper arm 31 passes, and then it is made to project and the stopper arm 31 is locked. This state is a normal use state, and when a fire or the like does not occur, this state is maintained, and the room such as a toilet or bathroom is ventilated through the duct 45 in FIG. 7. The stopper arm 31 may be set by removing the cover 21 shown in FIG. 3A from the box 12.

Next, when a high temperature air passes through the casing 1 of FIG. 1 due to a fire or the like, the shape memory alloy spring 40 of the trigger mechanism 5 contracts, so that the tip of the operating shaft 33 retracts. Accordingly, the stopper arm 31 is disengaged, and the blade 3 immediately closes the passage in the duct by the urging force of the spring 30 of the hinge 2 (state of FIG. 2). When the blades 3 are closed, the hot air does not hit the trigger mechanism 5. When the fire is extinguished, the temperature of the air drops. As a result, the operating shaft 33 projects again due to the urging force of the return spring 39, but the blade 3
Remains closed.

Once a fire or the like occurs, the entire trigger mechanism 5 is replaced. Even at that time, the work is easy if the cover 21 is removed. At the time of a test or the like, when the temperature inside the duct is lowered after the trigger mechanism 5 is operated by a hair dryer or the like, the tensile force of the shape memory alloy spring 40 is lowered again. After that, the operating rod 4 is operated to lift the blades 3 and the actuating shaft 33 is projected so that the stopper arm 3
1 can be locked and returned to the state of FIG.

Although the above-described embodiment shows the fire damper for two pipes, the fire damper of the present invention can also be used for a duct for a single pipe. Further, in the above-mentioned embodiment, the blade 3 is brought into direct contact with the stoppers 17 and 18, but a heat-resistant sealing material such as rock wool may be used to enhance the sealing property at the time of contact.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a fireproof damper of the present invention.

FIG. 2 is a partially cutaway perspective view showing the shielding state.

3a and 3b are a side view and a front view of the fire damper in the state of FIG.

4a and 4b are a side view and a front view of the fire damper in the state of FIG.

5a and 5b are longitudinal sectional views of FIGS. 3b and 4b, respectively.

6A and 6B are a partially cutaway plan view and a side view showing an embodiment of a trigger mechanism of the present invention.

FIG. 7 is a cross-sectional view showing an installed state of the fireproof damper of the present invention.

FIG. 8 is a front view showing an example of a conventional fire protection damper.

[Explanation of symbols]

A fire damper 1 casing 2 hinges 3 feathers 4 control rod 4a Operation axis 4b operation arm 5 Trigger mechanism 13 partition boards 17 Stopper 18 stopper 20 openings 21 cover 23 Bearing member 24 Holding member 25 inspection mouth 30 torsion coil spring 31 Stopper arm 32 holder 33 Working axis 34 body 35 Lid 37 Support piece 38 E-ring 39 Return spring 40 shape memory alloy spring

Front Page Continuation (72) Inventor Katsuya Murakami 3-5-25 Higashi-Konoike-cho, Higashi-Osaka City, Osaka Prefecture (56) References JP-A-56-119440 (JP, A) Actual Development Shou 61-14054 (JP, U) Actually open 62-78944 (JP, U) Actually open 60-138556 (JP, U) Special public 39-14765 (JP, B1) Actual public 48-26054 (JP, Y1) (JP 58) Fields surveyed (Int.Cl. ⁷ , DB name) A62C 2/12

Claims (5)

(57) [Claims] 1. A tubular casing, a blade having one end rotatably attached to an inner surface of the casing so as to open and close the inside of the casing, a means for urging the blade in a closing direction, and Between the blade operating means, which is rotatably provided behind the blade and which operates the blade to the open position, and the state in which the blade operating means is locked in the blade open position and is released from the locked state. and a actuating member which operates when the temperature within the casing rises above a predetermined temperature, Ri Do and a trigger mechanism having a temperature actuated element for actuating the actuating member in the position of the unlocking, said wings operating means , Rotate to the bearing installed in the casing
Freely installed operation shaft and blade from the tip of the operation shaft
To open and close the blades according to the rotation of the operating shaft.
Control arm and the base end located outside the casing.
The striker engaging the actuating member of the trigger mechanism.
Fire damper with upper arm . 2. A cylindrical casing and an inner surface of the casing for opening and closing the inside of the casing.
A blade whose one end is rotatably attached to the blade, means for urging the blade in a closing direction, and a rotatably provided behind the blade in the casing.
In addition, the blade operating means for operating the blade in the open position and the state in which the blade operating means is locked in the open position
An actuating member that operates between the unlocked state and
And the temperature inside the casing rises above a predetermined temperature.
Temperature actuation to move the actuating member to the unlocked position.
The trigger mechanism comprises a trigger mechanism having an element, the trigger mechanism is a return spring for urging the operating member in the direction of the locking state at all times, and the pulling force is weak at normal temperature and the spring force recovers at a temperature higher than a predetermined temperature. that it has a shape memory alloy spring pulling method to release the engagement of the actuating member
Fire protection damper. 3. A cylindrical casing and an inner surface of the casing for opening and closing the inside of the casing.
A blade whose one end is rotatably attached to the blade, means for urging the blade in a closing direction, and a rotatably provided behind the blade in the casing.
In addition, the blade operating means for operating the blade in the open position and the state in which the blade operating means is locked in the open position
An actuating member that operates between the unlocked state and
And the temperature inside the casing rises above a predetermined temperature.
Temperature actuation to move the actuating member to the unlocked position.
The casing is divided into two adjacent ducts by a partition plate extending in the axial direction, and the vanes, means for urging the vanes, vane operating means, and fire protection damper provided with a trigger mechanism. 4. A trigger mechanism used for a fireproof damper, comprising a cylindrical holder, an operating shaft slidably accommodated in the holder in a state where both ends project from the holder, and the operating shaft. A return spring that urges in the tip direction, one end fixed to the rear edge of the holder, and a support piece that extends to the rear of the holder, and is stretched between the rear end of the operating shaft and the support piece. A trigger mechanism used for a fire damper, which has a weak force and a shape memory alloy spring that recovers the spring force at a temperature higher than a predetermined temperature and pulls the operating shaft toward the rear end against the biasing force of the return spring. 5. A prismatic casing, one end of which is rotatably attached to the inner surface of the casing so as to rotate between an open position along the inner surface of the casing and a closed position where the casing is closed. And a blade that is normally elastically biased in the closing direction, and is rotatably provided on the casing, one end of which abuts on the blade to maintain the blade in an open state, and the other end of which is outside the casing. The operating arm that protrudes to the outside, the stopper arm that is provided on the portion of the operating arm that protrudes to the outside of the casing, the protruding state that locks the stopper arm at the position where the blade is opened, and the unlocking And the operating member that is elastically biased in the protruding direction at all times and that the pulling force is usually weak and the temperature inside the casing is above the specified temperature. When elevated, the tensile force a shape memory alloy spring retracting the actuating member is restored to a position of unlocking, fire dampers are provided and.