JPH0242297Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a fire damper device, and more particularly to a cassette type fire damper device that can be inserted and mounted through an opening in a duct terminal.

The conventional fire damper 1' was installed in the middle of a duct 2 installed indoors. For this reason, it is necessary to provide an inspection port 3 in the ceiling surface or the like in preparation for maintenance inspections such as inspection of the duct 1' or replacement of fuses. Providing this inspection port 3 increases the cost of mounting the damper 1. Further, even if the inspection port 3 is provided, in apartment buildings and the like, the free space within the ceiling is narrow, making the maintenance and inspection difficult (see FIG. 1).

This invention was devised in view of the above-mentioned circumstances, and aims to solve the above-mentioned problems by providing a cassette-type fire damper device in which the fire damper can be easily installed through the opening of the duct terminal. be.

This invention will be explained below using examples based on the drawings.

In FIG. 2, a cassette type fire prevention damper device 1 and an exhaust shade 6 are attached to an end opening 5 of the duct 2 that projects above an outdoor balcony 4.

3 and 4, the damper device 1 is pivoted by a damper casing 7 that can be inserted into a duct 2, and a hinge shaft 9 having a spring 8 provided in the casing 7 and a coaxial shaft 9. A pair of damper plates 10 are provided.

The casing 7 is formed into a short cylindrical shape that matches the inner circumferential shape of the duct 2, and has a plurality of mounting and locking pieces 1 at the outdoor end thereof bent into a U-shape.
1 are fixed to the periphery at equal intervals, and a rotation stopper 12 for the plate 10 is formed at the other end. The locking piece 11 is adapted to fit over the thickness of the opening 5 of the duct 2, and fixes the casing 7 within the duct 2.

A pair of plates 10 pivotally supported on the shaft 9 are
is urged in the direction of closing the duct by the spring 8 and comes into contact with the detent 12 of the casing 7;
The duct 2 is closed. Such a plate 10 is returned to the position where the duct 2 is open, and is held in the duct 2 open state by the stopper 13 and the fuse 14 which serves as a fusible locking piece.

The stopper 13 is an angle-shaped member that can hold the end of the plate 10 from inside, and is fixed to both sides of the shaft 9.
In this example, a metal plate that melts at about 72° C. is formed into a U-shape and is placed over the outside of the plate 10. When the plate 10 is held in the position where the duct 2 is open by the fuse 14, the fuse 14 melts and breaks at a predetermined temperature when hot air is blown due to a fire or the like, and the duct 2 is immediately closed.

Also, when replacing this fuse 14, the exhaust cap 6
This can be easily carried out through the opening 5 of the duct 2 by simply removing the casing 7, and if necessary, maintenance and inspection can be carried out at any location by pulling out the casing 7. Furthermore, the re-equipment is also done using the casing 7.
It is sufficient to simply insert the locking piece 11 through the opening 5 and fit the locking piece 11 over the thickness of the opening 5.

The embodiment of the cassette type fire damper device according to this invention is as described above and has the following effects.

Since the fire damper device is a cassette type consisting of a casing, it can be easily inserted through the opening of the duct terminal.

Furthermore, since maintenance and inspection can be performed through the opening, an indoor inspection port can be eliminated. Furthermore, providing the damper device near the outside of the duct prevents hot air from entering due to a fire or the like at the duct terminal. In other words, it was possible to improve fire protection compared to the conventional type.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a conventional fire damper device;
FIG. 2 is a plan view showing a cassette-type damper device according to this invention, and FIG. 3 is a sectional view showing the same device.
Figure 4 is its front view. 1, 1'... Fire damper device, 2... Duct,
3...Inspection port, 4...Balcony, 5...Opening,
6... Exhaust cap, 7... Casing, 8... Spring, 9... Shaft, 10... Damper plate, 11
... Locking piece, 12 ... Stopper, 13 ... Stopper, 14 ... Fuse.

Claims (1)

[Scope of Claim for Utility Model Registration] A fire prevention damper device that is installed in a ventilation duct and automatically closes the duct by melting a fusible piece, the fire prevention damper device can be inserted from the end opening of the duct, and The damper casing has a short cylindrical shape that matches the shape of the inner circumference of the damper casing, and a plurality of mounting and locking pieces each having a U-shaped tip are fixed to the outer edge of the damper casing at equal intervals on the outer edge of the damper casing. A pair of damper plates are provided in the damper casing and are pivoted by a hinge shaft having a spring and biased in a direction to close the duct.
A cassette type fire prevention damper device, characterized in that both plates are held in a fully open position of the duct by fusible locking pieces.