JP2636588B2 - Fire damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire damper attached to a ventilation opening to prevent a fire from spreading in a fire or the like.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a cross-sectional view showing a conventional fire damper (hereinafter referred to as a first conventional example) shown in Japanese Unexamined Patent Publication (Kokai) No. H11-209, in which 1 is a damper, 2 is a weight mounted on the upstream side of the damper 1, and 3 is the above. It is a damper main body that supports the damper 1 and serves as a flange 10 whose downstream end stands up toward the inside of the air passage 9. Reference numeral 4 denotes a shaft for rotatably supporting the damper 1 on the damper body 3. Reference numeral 5 denotes a temperature fuse which melts by receiving heat, and a ring 6 is attached to the damper body 3 at one end to the damper 1 to keep the damper 1 horizontal. It is locked through. Reference numeral 7 denotes a vent cap, which can prevent rain, birds and the like from entering through the through hole 8.

Next, the operation will be described. At normal temperature, the damper 1 is held substantially horizontally by the weight 2, the thermal fuse 5, and the ring 6, but when the temperature fuse 5 exceeds the melting temperature due to a fire or the like, the damper 1 melts.
Due to the weight of the shaft, it rotates around the shaft 4 and contacts the flange 10. For this reason, the ventilation path 9 is closed by the damper, and it is possible to prevent a fire or the like from spreading along the ventilation path 9.

FIGS. 8 and 9 show Japanese Patent Application Laid-Open No. 61-295.
No. 455 discloses a conventional fire damper (hereinafter referred to as a second conventional example).
The duct 13 is supported by a shaft 14 fixed to the duct 11 and is a damper that can be opened like a butterfly,
It has two semicircular shapes. Reference numeral 15 denotes a heat deformable body made of a shape memory alloy, which is engaged with two dampers 13,
It is stored so as to be transformed into an angle of approximately 180 ° by the heat reception.

In the second conventional example, at normal temperature, the two dampers 13 are closed toward the downstream side in the duct 11. Accordingly, the exhaust gas flowing in the direction of the arrow in FIG. 8 is not blocked. However, when the temperature of the exhaust gas reaches the thermal deformation operating temperature of the thermal deformation body 15 due to a fire or the like, the two deformed dampers 13 deform the thermal deformation body 15 so as to close the duct 11. , The inside of the duct 11 is closed,
Therefore, it is possible to prevent a fire or the like from spreading along the duct 11.

In a fire damper (hereinafter referred to as a third conventional example) as shown in FIG. 1 (not shown) of Japanese Utility Model Publication No. Sho 62-26111, an outside of a ventilation opening provided on a wall or the like is provided. At the upper part, one end of a damper having substantially the same size as the ventilation port is pivotally supported, and a thermal fuse is attached to the other end of the damper, and the thermal fuse is fixed to the inner surface of the hood.

In the third conventional example, when the exhaust gas exceeds the melting temperature of the thermal fuse due to the occurrence of a fire or the like, the thermal fuse is blown, and the damper is rotated around the upper shaft outside the ventilation hole. Can block the ventilation opening and prevent the spread of fire such as fire.

[0008]

In the first conventional example, not only the drain easily accumulates on the flange 10 but also rainwater may enter through the through hole of the vent cap, which causes a problem in corrosion resistance. is there.

In the second conventional example, since the damper is located inside the duct, a gap is required between the damper and the duct so that the damper can be opened and closed satisfactorily. However, a separate means for closing the gap is required. . However, if the flange is provided as in the first conventional example, there is a problem that the drain easily accumulates. If the flange is not provided, there is a problem that the effect of preventing the spread of fire or the like is reduced by half. .

Further, in the third conventional example, the angle between the damper and the ventilation opening must be increased in order to make the passage of exhaust gas in the hood good, and therefore, the distance between the hood and the wall is increased. Then, the opening below the hood becomes large, and there is a problem that rainwater is likely to enter due to rain and wind.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a fire prevention damper in which drain does not easily accumulate in a ventilation opening or a ventilation path and rainwater does not easily enter. I do.

[0012]

According to the present invention, there is provided a fire damper having a ventilation hole provided in a wall, a hood communicating with the ventilation hole outside the ventilation hole and having an opening A below, An extending outlet having a flange extending outwardly and extending at least below the opening, and having an opening B communicating with the hood and the ventilation port, a damper pivotally supported outside the opening B and being larger than the opening B; Divided damper,
An elastic member for urging the split damper so as to contact the flange, and a locking piece for locking the split dampers with the opening B opened and releasing the lock by receiving heat. is there.

[0013]

The rainwater blown into the opening A is blocked by the flange projecting downward from the outlet extending outside the wall, so that it is possible to prevent the rainwater from entering the ventilation path. Further, since there is no need to provide an upright flange in the ventilation opening or the ventilation path, no drain is collected.

[0014]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 21 denotes a wall having a cylindrical ventilation port 22 and a cylindrical ventilation port connecting port 23 outside the wall.
Is installed. An outer end of the ventilation port connection port 23 is formed as a bent edge 24 bent at substantially right angle, and a hood 25 communicating with the ventilation port 22 outside the ventilation port 22 is provided at an upper portion thereof.
Is screwed. An opening 26 serving as an opening A is provided below the hood 25 so as to discharge exhaust air sent from the ventilation port 22. Reference numeral 27 denotes a cylindrical extension extending outside the ventilation port connection port 23 and outside the wall 21, and has a flange 28 having an outer end extending over the entire circumference. Inside the extension outlet 27, an opening 29 which is an opening B communicating the ventilation port 22 and the hood 25 is formed.

Reference numerals 31 and 32 denote divided dampers obtained by dividing a circular damper larger than the opening 29 into two parts, and are supported by a shaft 33 outside the flange 28. The shaft 33 is composed of two upper and lower supports 3 attached to the bent edge 24 of the ventilation port connection port 23.
0 supports it at approximately the center of the flange 28.

Reference numerals 34 and 35 denote springs serving as elastic members, which are pivotally supported by a shaft 33, and are provided vertically in this embodiment. Each of the springs 34 and 35 has one end fixed (not shown), and the other end locked to the split dampers 31 and 32.
1, 32 are urged to abut the flange 28. The split dampers 31 and 32 have springs 34 and 35, respectively.
A concave portion 43 is provided to make it easier to mount (see FIG. 3). In order to prevent the recess 43 from forming a gap between the divided dampers, a lid piece 44 is attached to the divided damper 31 by spot welding.

At opposite ends of the split dampers 31 and 32, ridges 37 and 38 are provided, respectively. The split dampers 31 and 32 cause the opening 29 to be opened, and are engaged by a thermal fuse 39 as a locking piece. Has been stopped. As the locking piece, a material that can be melted or deformed by receiving heat from exhaust gas that has been hot weathered due to the occurrence of a fire or the like may be used, and a shape memory alloy, a bimetal, or the like may be used.

Reference numeral 40 denotes a cushioning member which is held between the divided dampers 31, 32 when the divided dampers 31, 32 are locked by the thermal fuse 39, and is attached to the tip of the support metal 30. Reference numeral 41 denotes an air guide which is attached to the inner surface of the hood 25 and bent into a plurality of steps. Others 42 are openings 26
The gallery is located in the area and prevents rain and birds from entering.

Next, the operation will be described. Split damper 3
1 and 32 are a temperature fuse 39 and springs 34 and 3 at normal temperature.
5 is held substantially perpendicular to the flange 28. Since the divided dampers 31 and 32 sandwich the buffer member 40 provided at the tip of the support metal 30, the rattling of the right and left is prevented.

When the exhaust gas discharged from the ventilation opening exceeds the melting temperature of the thermal fuse 39 due to the occurrence of a fire or the like, the thermal fuse 39 is melted and released from the engagement with the ridges 37 and 38. The split dampers 31, 32 close the opening 29 by the action of the springs 34, 35 which urge the 31, 32 so as to contact the flange 28 (see the chain line in FIG. 5).
Thereby, it is possible to prevent a fire or the like from spreading along the ventilation opening.

Further, since the extension outlet 27 is formed as a flange 28 extending outside the wall 21 and the outer end of the flange 28 extends over the entire circumference, rainwater entering from the opening 26 due to strong wind and rain is applied to the rear side of the flange 28. To prevent this (see the arrow in FIG. 1), there is no danger of rain getting into the ventilation opening 22.

Further, since there is no need to provide a flange for locking the damper in the ventilation passage as in the second conventional example,
Drain can be prevented from accumulating in this flange, and furthermore, this flange does not block exhaust air and generate pressure loss. Since the divided dampers 31 and 32 are supported at substantially the center of the flange 28, the thermal fuse can be positioned substantially at the center of the exhaust gas flow, so that heat can be sensed quickly and the operation can be performed accurately.
Further, since the necessary members for the fire prevention damper are not mounted on the hood side, maintenance can be performed only by removing the hood 25 without disassembling the fire prevention damper.

Embodiment 2 FIG. In the first embodiment, the outlet 27
Although the structure in which the support metal 30 and the support metal 30 are separated is shown, the support metal 30 may be integrated with the extension outlet 27 by extending the flange 28 (see FIG. 6). In addition, ventilation port connection port 23 and extension outlet 2
7 may be integrally formed.

[0024]

As described above, according to the present invention, since the flange for receiving the damper is extended below the extension outlet extending outside the wall, the drain is collected in the ventilation opening or the ventilation passage. And has the effect of preventing rainwater from entering.

[Brief description of the drawings]

FIG. 1 is a sectional side view showing an embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing one embodiment of the present invention.

FIG. 3 is a perspective view showing a main part of the present invention.

FIG. 4 is a perspective view showing a supporting metal of the present invention.

FIG. 5 is a sectional plan view showing a main part of the present invention.

FIG. 6 is a sectional side view showing another embodiment of the present invention.

FIG. 7 is a cross-sectional side view showing a first conventional example.

FIG. 8 is a sectional side view showing a second conventional example.

FIG. 9 is a perspective view showing a second conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Wall 22 Ventilation opening 25 Hood 26 Opening 27 Extension outlet 28 Flange 29 Opening 31 Split damper 32 Split damper 33 Axis 34 Spring 35 Spring 39 Spring 39 Temperature fuse

Claims (1)

(57) [Claims] 1. A vent provided on a wall, a hood communicating with the vent outside the vent and having an opening A below, and extending outward from the wall and projecting at least below the wall. An extension outlet having a flange and having an opening B communicating the hood with the ventilation opening, a split damper pivotally supported outside the opening B and dividing a damper larger than the opening B, A fire damper, comprising: an elastic member that urges the flange so as to contact the flange; and a locking piece that locks the divided dampers with the opening B open and releases the locking by receiving heat.