JP2604923B2 - Fire damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for connecting to a duct which is mainly mounted in an outer wall and communicates with a room.
In a fire, the thermal fuse blows, the damper closes,
The present invention relates to a fire damper that shuts out air.

[0002]

2. Description of the Related Art In recent years, demands for fire prevention dampers are increasing more and more because of their safety as ventilation members for ducts for preventing fire spread by fire.

Conventionally, this type of fire damper has been disclosed in
A configuration as shown in Japanese Patent Application Laid-Open No. 2-23197 was common. Hereinafter, the configuration will be described with reference to FIGS.

[0004] As shown in the figure, 101 is a ventilation passage 1 inside.
02, a cylindrical body having both ends opened, and a protruding portion 103 protruding inward over the entire circumference at one end thereof. A shaft 104 is provided near the protruding portion 103 through a ventilation passage. 102. The shaft 104 has a damper plate 1 divided into a semi-circular shape.
A damper 107 composed of 07a and 107b is provided so as to open and close the ventilation passage 102 in a freely rotatable manner by engaging a hinge 108 provided in each damper plate division. The shaft 104 has a damper plate 1.
07a and 107b are always pressed against the projecting peripheral portion 103, and the spring 1 is biased to close the ventilation passage 102.
10 is wound. Then, the damper plate 107a,
Bracket 1 provided with 107b on the inner peripheral surface of main body 101
06 is held by the temperature fuse 111 at a position where the ventilation passage 102 is opened. This thermal fuse 1
A wire 112 is inserted into the center of a tube portion 111a made of a low melting point alloy. One end of the wire 112 is inserted into an engagement hole 109 provided in a damper plate, and the end is bent to form a damper. And the tube body 111a faces the air passage 102.

When the fire protection damper constructed as described above is attached to the middle of a duct or an outlet in a ventilation facility such as a building, hot air generated at the time of a fire enters the ventilation passage 102 of the fire protection damper, and the temperature fuse is connected. 111
Is melted, and only the wire 112 remains. One side of the wire is straight, so one side of the damper plate 1
4, 07a is urged by a spring 110 to open to the position of the protruding periphery 103, and the damper plate 107a on the other side is opened.
Is also strongly pressed from above by the spring 110,
By closing the ventilation passage 102 and preventing the spring clutch 105 provided in the ventilation passage 102 from engaging with each damper plate to open the ventilation passage 102, it is possible to prevent a fire from spreading. I was

[0006]

In such a conventional fire damper, the damper plates 107a and 107b of the damper 107 held by the temperature fuse 111 at the position where the ventilation passage 102 is opened contact the bracket 106, and Although the gaps B are formed at regular intervals, the damper plate divisions of the gaps B are closed by the shafts 104 with which the hinges 108 are engaged, so that the opening area of the ventilation path 102 is reduced to reduce the ventilation resistance. There was a problem of increasing. Further, since the tubular portion 111a of the thermal fuse 111 is provided so as to protrude into the ventilation passage 102, it is easy to receive an external impact, and the tubular portion 1a is not fired.
There are also problems that the damper 11a is damaged and the damper closes the ventilation path 102, or that the wire 112 is deformed when a fire occurs, the damper malfunctions, and the ventilation path is not closed.

An object of the present invention is to solve the above-mentioned problems, and a first object of the present invention is to provide a fire damper capable of reducing a ventilation resistance when an air passage is opened.

A second object is to prevent a malfunction of a damper when a fire occurs without impairing the blowing sensitivity of the thermal fuse.

[0009]

According to the present invention, a first means for achieving the first object is a cylindrical frame having a ventilation passage therein and having both ends opened, A support pin projecting from a position facing the peripheral surface toward the center of the ventilation path, and a two-divided damper supported by the support pin and rotatably opening and closing the ventilation path are always connected to the ventilation path. A coil spring that urges in a closing direction, and a temperature fuse that forcibly holds the damper at a rotated position so as to open the ventilation path and blows at a predetermined temperature, and the damper includes: A support part supported by the support pin is provided in the divided part, and the ventilation path is forcibly rotated to the open state, and a damper ventilation is provided between them at the position held in the open state by the temperature fuse. Fire protection that formed a road It is obtained by the configuration of the bumpers.

A second means for achieving the second object has a configuration in which a thermal fuse is provided in a damper ventilation passage between dampers held in an open state.

[0011]

According to the first aspect of the present invention, a support pin for supporting a support portion of a two-part damper is provided separately from a position facing the inner peripheral surface of the ventilation path. Since the damper ventilation passage is formed at the position where the damper supported by the pin is held open by the thermal fuse, the ventilation resistance is reduced, and the flow of the wind can be improved.

[0012] Further, since the thermal fuse is provided in the damper ventilation path between the dampers by the configuration of the second means, the thermal fuse is protected by the damper, and no external impact is applied. When hot air is generated, hot air passes through the damper ventilation path and the thermal fuse is exposed to the hot air, so that it is possible to prevent a reduction in the fusing sensitivity.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

As shown in the drawing, reference numeral 1 denotes a cylindrical frame having an air passage 2 therein and having both ends opened, a flange 3 having one end protruding outward, and a other end. And a stopper 4 protruding inward. Also, at each of the opposing positions on the inner peripheral surface near the stopper 4,
A support pin 5 protrudes toward the center of the ventilation passage 2. A damper 6 composed of dampers 6a and 6b divided into a semi-circular shape is engaged with the support pin 5 by engaging a support portion 7 provided in each divided portion so as to be rotatable. It is equipped to open and close. A coil spring 8 is wound around each of the support pins 5 so that the damper plates 6 a and 6 b are constantly pressed against the stopper 4 to close the ventilation passage 2. Then, the damper plate 6 is forcibly
a and 6b abut against a locking screw 9 disposed on the frame 1 and are held by a temperature fuse 10 at a position where the ventilation path 2 is opened, and a damper ventilation path 11 is provided between the damper plates 6a and 6b. Has formed. In addition, thermal fuse 1
No. 0 has engagement holes 12 at both ends, engages the engagement holes 12 with locking claws 13 provided on the damper plates 6a, 6b, and is provided in the damper ventilation passage 11. I have.

With the above configuration, the air passing through the fire damper can pass through both the ventilation path 2 and the damper ventilation path 11.

As described above, according to the fire prevention damper of the present embodiment, the ventilation resistance of the ventilation path can be reduced.

Further, since the thermal fuse 10 for holding the damper plates 6a and 6b in the open state is provided in the damper ventilation passage 11, the thermal fuse 10 is directly exposed to the air passing through the damper ventilation passage 11, and In addition, external shocks can be prevented by the damper plates 6a and 6b.

As described above, according to the fire prevention damper of the present embodiment, it is possible to prevent a decrease in the fusing sensitivity of the thermal fuse and to protect the thermal fuse.

[0019]

As is apparent from the above embodiments, according to the present invention, when the damper plate of the damper is held by the thermal fuse with the ventilation path opened, the damper ventilation port is formed between the damper plates. It is possible to provide a fire damper with reduced ventilation resistance in the ventilation path and good wind flow.

Also, since the thermal fuse is provided in the damper ventilation path, it is possible to provide a fireproof damper that can prevent malfunction of the damper without impairing the fusing sensitivity of the thermal fuse when a fire occurs.

[Brief description of the drawings]

FIG. 1 is a front view of a fire damper according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the same.

FIG. 3 is a partially cutaway perspective view of an open state of a conventional fire damper.

FIG. 4 is a partially cutaway perspective view of the closed state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 2 Ventilation path 5 Support pin 6 Damper 7 Support part 8 Coil spring 10 Thermal fuse 11 Damper ventilation path

Claims (2)

(57) [Claims] 1. A cylindrical frame having an air passage therein and having both ends opened, and support pins projecting from a position facing an inner peripheral surface of the air passage toward a center of the air passage. A two-part damper supported by this support pin and rotatably opening and closing the ventilation path, and a coil spring wound around the support pin and constantly biasing the damper in a direction to close the ventilation path, Holding the damper in the forcibly rotated position to open the ventilation path,
A thermal fuse that blows at a predetermined temperature, wherein the damper includes a support portion supported by the support pin in a divided portion, and forcibly rotates the ventilation path to an open state to open the damper by the thermal fuse. A fire damper that forms a damper ventilation path between them at a position held in a state. 2. The fire protection damper according to claim 1, wherein the thermal fuse is provided in a damper ventilation passage between the dampers held in an open state.