JPH0357255Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a fire damper in a duct.

Such dampers are normally open, but in the event of an emergency such as a fire, they automatically close the inside of the duct to prevent flames and smoke from spreading.According to the Building Standards Act and the Ministry of Construction notification, the duct must be placed in a fire prevention zone. It is mandatory to install such a fire damper in cases where the building penetrates through the building or extends over two or more floors.

First, a conventional fire damper will be explained. As shown in FIGS. 1 and 2, vanes 3 and 3' are attached to shafts 2 and 2' provided in a duct 1.

In this way, under normal conditions, the blades 3 and 3' are held horizontally as shown in Figure 1 to ensure ventilation inside the duct 1, and when a fire occurs, a signal is sent from the detector a and the fuse 4 is activated. The closing device 5 provided outside the duct 1 is activated by melting, etc., and the shaft 2,
The blade 2' is rotated to make the blades 3, 3' vertical for closing. In the figure, 6 indicates a link that interlocks the shafts 2 and 2'.

However, if a corrosive gas such as an acid gas passes through the duct 1, the driving parts, centering on the shafts 2 and 2', will become rusted, and there is a risk that the closing function will not be able to be performed in an emergency.

The purpose of this invention is to eliminate the disadvantages of the above conventional example,
To provide a fire damper capable of preventing functional failure by preventing corrosive gas from touching a driving part.

However, according to the present invention, the purpose of the lever is to interpose a packing at the end of the vane plate that can close the inside of the duct, store it in a recess formed in the duct wall, and place the drive part of the vane outside the duct. This is achieved by

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a longitudinal sectional front view showing an embodiment of the fire prevention damper of the present invention, and FIG. 4 is a longitudinal sectional side view of the same. A recess 8 for storage is formed in the duct wall 1a near 7.

In the figure, reference numeral 9 denotes a flat box-shaped blade plate having a flat surface 9a having a larger area than the opening of the receiving frame 7, and whose peripheral edge is bent at right angles, and a packing 10 is interposed at the end portion 9b of the blade plate 9. and store it in the recess 8. The packing 10 is concave and the end 9 of the blade plate 9 is inserted into the groove.
By entering b, the blade plate 9 is attached so as to protrude around the edge portion 9b so as to wrap around it.

The end of the drive arm 11 is connected to the center of the back surface of the vane plate 9 surrounded by the packing 10 and the duct wall 1a forming the recess 8.

The drive arm 11 is a combination of a curved portion 11a bent in an arc so that the blade plate 9 can come out of the recess 8 and come into contact with the receiving frame 7, and a rotation bar 11b connected to the other end of the curved portion 11a. In the curved portion 11a, only a part near the vane plate 9 enters the duct 1,
The other is arranged outside the duct 1, passing through the duct wall 1a forming the recess 8.

Outside the duct 1, a coiled spring 13 is attached to the bar 11b via an interlocking shaft 12, and the elasticity of the coiled spring 13 urges the bar 11b so as to push the curved portion 11a into the duct 1.

Further, a locking projection 11c is provided on the bar 11b, and a retractable rod 16, which is pulled by a spring 15 when the temperature fuse 14 in the duct 1 is melted, is engaged with the locking projection 11c.

Furthermore, a corrosion-resistant coating 17 is applied to the inner surface of the duct wall 1a including the recess 8 and the front and back surfaces of the blade plate 9.

As described above, in this embodiment, the arm 11, the interlocking shaft 12, and the coil spring 13 serve as the driving parts for the blade plate 9.
However, the present invention is not limited to this, and it is also possible to use a drive section having another structure.

Next, to explain the usage and function, normally the protruding rod 16 is attracted to the locking protrusion 11c, or the bar 11b is previously fixed, and in this state, the wing plate 9 is stored in the recess 8, and the end is packed. 1
0 and is in close contact with the duct wall 1a.

As a result, even if corrosive gas passes through the duct 1, it will not enter the back side of the vane plate 9, and the drive mechanism of the vane plate 9 can be prevented from being attacked by the corrosive gas.

If a fire breaks out and the fuse 14 melts, the spring 15 will cause the rod 16 to separate from the protrusion 11c and the bar 1
The fixation of 1b is released.

This bar 11b is connected to the coiled spring 1 via the interlocking shaft 12.
3 and falls in the opposite direction.

As the bar 11b moves, the curved part 11a is pushed deeply into the duct 1, and the blade plate 9 comes out of the recess 8 and comes into contact with the receiving frame 7 as shown by the chain line, and the duct 1
Block the inside.

As mentioned above, in the fire prevention damper for ducts according to the present invention, the driving part of the vane for closing the duct is mainly located outside the duct, and the part inside the duct is also sealed with packing, so that these parts are free from corrosion. There is no risk of rusting due to toxic gases and causing functional problems in emergencies.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional front views showing a conventional damper, FIG. 3 is a longitudinal sectional front view showing an embodiment of the damper of the present invention, and FIG. 4 is a longitudinal sectional side view of the same. 1...Duct, 1a...Duct wall, 2, 2'...
...Shaft, 3,3'...Blade, 4...Fuse, 5...
...Closing device, 6...Link, 7...Receptacle, 8...
Recessed portion, 9... Feather plate, 9a... Plane, 9b... End, 10... Packing, 11... Drive arm,
11a...Curved portion, 11b...Rotating bar, 11c
... Locking protrusion, 12 ... Interlocking shaft, 13 ... Winding spring, 14 ... Temperature fuse, 15 ... Spring, 16
...Intruding rod, 17...Corrosion-resistant coating.

Claims (1)

[Scope of utility model registration request] A flange portion serving as a receiving frame is provided protruding from a duct wall forming a duct, and a recessed portion for storage is formed in the duct wall near the receiving frame, and has a flat surface having a larger area than the opening of the receiving frame. A concave packing is provided at the end of a flat box-shaped wing board whose peripheral edge is bent at right angles so as to protrude from the outer periphery so as to wrap around the end, and this wing board is stored in the recess, and this packing and storage A fire prevention damper in a duct, characterized in that an end of a drive arm is connected to the center of the back surface of a vane surrounded by a duct wall forming a recess, and the drive arm is connected to a drive part arranged outside the duct. .