JPS5851533Y2 - fire damper - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a fire damper that is installed in a smoke exhaust duct or the like and automatically closes the smoke exhaust duct in the event of a fire.

A conventional fire damper has a structure as shown in FIG. 1 or FIG. 2, for example.

In the one shown in FIG. 1, the damper 102, which is biased towards the closing side, is held in the closed state by a temperature fuse 107 fixed to the main body frame 101.
7 is fixed to the main body frame 101 and a temperature fuse 107
Since it takes time to fuse, there is a problem that the response to heat is poor.

In this regard, in the case shown in FIG.
By attaching the temperature fuse 107 between the legs 112 and the main body frame 101, the temperature fuse 107 can be moved away from the main body frame 101, so that the response to heat is better than that of the previous example.

However, the damper 10 due to the melting of the temperature fuse 107
2. When the damper 102 is closed, the legs 112 protruding toward the damper 102 may hit other attached members or equipment, and the damper 102 may not be completely closed, so a reliability problem remains.

The present invention aims to solve the above-mentioned conventional problems and provides a fire damper that is excellent in both responsiveness and reliability.

Next, the structure of the present invention will be specifically explained based on the embodiments shown in the drawings from FIG. 3 onwards.

The fire damper as an application example of the present invention shown in Fig. 3 is as follows:
It consists of a main body frame 1, a tear tanker 2 which is one of the main functional parts of the fire damper, and a damper braking system which is the other main functional part of the fire damper.

The main body frame 1 has a housing structure in the form of a single roof with the lower side open in the figure, and the side wall on the left side in the figure that communicates with the open end of the duct 4 has an opening smaller than the planar area of the damper 2 as the damper contacting part 4. A duct connection port 5 of the area is opened.

One side of the damper 2 is pivotally supported inside the upper edge of the damper contact portion 4, so that the damper 2 can rotate within the main body frame 1.

An elastic member (not shown) such as a spring is attached to the pivot portion of the damper 2, so that the damper 2 is always urged to come into close contact with the damper contact portion 4 and seal the duct communication port 5. -ing

The damper braking system includes a holding cam 6 that receives the damper 2 in an open state, and a temperature fuse 7 made of hot melting metal that locks the holding cam 6 against the biasing force of the damper 2. It consists of member 8.

The holding cam 6 is formed into a substantially fan-shaped plate shape, and its main portion is pivotally attached to a mounting piece 9 protruding into the side wall 1A on the first right side of the main body frame in the figure so as to be freely rotatable.

In a free state, the holding cam 6 mounted in this manner is in a hanging shape and is located out of the rotation area of the damper 2.

A small hole 10 is formed in the outer corner of the holding cam 6, and a mounting piece 11 is formed at the upper edge of the duct communication port 5 of the damper contact portion 4, which is slightly bent toward the duct 3. A small hole is drilled in the hole.

A triggering member 8 is stretched between the hole 10 on the holding cam 6 side and the hole on the damper contact portion 4 side.

The triggering member 8 has a configuration in which a hook 12 hooked to a hole 10 on the holding cam 6 side and another hook 13 hooked to a hole on the damper contact portion 4 side are connected by a temperature fuse 7. .

By tensioning the triggering member 8, the holding cam 6
is rotated from the free state in the clockwise direction in the drawing, and is locked in the raised state as shown in FIG.

The holding cam 6 in the locked state is located within the rotation area of the damper 2, receives the outer edge of the damper 2 on its upper surface, and opens the damper 2 almost parallel to the slanted top plate 1B. maintain it.

That is, the biasing force in the closing direction of the damper 2 is applied as a tension to the triggering member 8 via the holding cam 6, and the tensile force of the triggering member 8 maintains the open state of the damper 2.

The fire damper with the above configuration has the temperature fuse 7 at a location away from the main body frame 1, and there are few factors that disturb the thermal situation, so when the temperature fuse 7 is heated to the melting setting value of the temperature fuse 7, the temperature fuse is faithfully set. 7 is fused.

When temperature fuse 7 is blown, hook 12 and hook 1
3 is released, the locking state of the holding cam 6 is released, and the holding cam 6 directly receives the urging force on the closing side of the damper 2 and rotates in a hanging shape.

With this rotation, the holding cam 6 moves out of the rotation range of the damper 2, and completely loses its function of receiving the damper 2.

Therefore, the damper 2, which is biased toward the closing side, rotates quickly because there is no longer a factor preventing this, and contacts the damper abutting portion 4 to close the duct communication port 5.

When the damper 2 is closed, the triggering member 8, which is divided into two by the melting of the temperature fuse 7, is not connected to the damper 2 itself on either side.
It does not become a factor that inhibits the closing operation.

Moreover, since it does not protrude toward the duct 3 side, even if other equipment or members are present in the relevant part, there will be no problem.

The holding cam 6 may be in the shape of a lever 8A in which two arms, one on the damper holding side and the other on the side connecting to the triggering member 8, are formed into a substantially dogleg shape, as shown in FIG.

However, the advantage of the previous example is that it is easier to obtain the required strength than the lever 8A.

As is clear from the above description of the embodiments, the fire prevention damper of the present invention does not have a braking system structure including a holding member and a temperature fuse for keeping the damper in an open state attached to the damper that moves to open and close. There is nothing that obstructs the closing action.

Therefore, high reliability can be obtained in the operation of the damper.

Furthermore, since the triggering member containing hot melt metal can be provided at a location away from the main body frame where there are few thermal disturbance factors, the damper can be quickly closed.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 and 2 are longitudinal sectional views showing a fire damper as a conventional example, and FIG. 3 is a longitudinal sectional view showing a fire damper according to an example of the invention in an open state. 4 is a longitudinal sectional view showing the state after the closing operation of FIG. 3, and FIG. 5 is a longitudinal sectional view showing only the main parts of another embodiment of the present invention. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (3)

[Scope of utility model registration request] (1) A damper that is always biased toward the closing side and is pivotably supported on one side of the main body frame and can be opened and closed, and a damper pivot of the main body frame that hangs outside the rotation area of the damper in a free state. A holding member rotatably provided on the side opposite to the supporting side, and the holding member is stretched between the holding member and the main body frame on the damper pivot side and connected at a part with hot melt metal. A fire prevention damper comprising: a triggering member that is raised to a state in which the damper is rotated so as to enable the holding member to maintain the damper open. (2) The fire prevention damper according to claim 1, wherein the holding member is in the form of a substantially fan-shaped cam. (3) The fire prevention damper according to claim 1, wherein the holding member is in the form of a lever formed by forming two arms, one on the damper holding side and the other on the triggering member connecting side, into a substantially dogleg shape.