JP7143132B2 - fire damper - Google Patents

Description

The present invention relates to a fire damper attached to the entrance of an exhaust duct of an exhaust hood installed in a kitchen.

A fire damper is attached to the entrance of the exhaust duct of the exhaust hood to prevent the flame from spreading through the exhaust duct of the exhaust hood when a fire breaks out in the kitchen inside the building. In general, fire dampers have the function of sensing heat in the event of a fire and closing the entrance of an exhaust duct. For example, there is a "Fire Damper for Smoke Exhaust System" described in Patent Document 1.

The above-mentioned "fire damper for smoke exhaust system" has a body provided with a blocking plate that is pivotally supported at both ends and can be opened and closed freely in the smoke exhaust path, and biases the blocking plate to a closed state. A holding member for holding the blocking plate in the open state against the spring force of the returning spring member is provided in the body, and the holding member is arranged on the rotational axis of the blocking plate so as to be perpendicular to the rotational axis of the blocking plate. The locking member is composed of an upright gear body and a locking member protruding from the body, and is composed of a tip side half and a base side half that separate at a set temperature. and the gear body, and the engaging portion provided on the front half body is engaged with the ratchet gear portion of the gear body.

JP-A-8-299485

In the "Fire Damper for Smoke Exhaust System" described in Patent Document 1, a plurality of openable and closable shielding plates are provided inside a rectangular tube-shaped body disposed in the smoke exhaust passage. An interlocking metal fitting for interlocking the opening and closing operations of the plates and a return spring member for urging each shielding plate to the closed state are arranged inside the body.

Therefore, in the fire damper, not only the plurality of shield plates arranged inside the body, but also the interlocking metal fittings and the return spring member are exposed to the oily smoke passing through the body. There is a possibility that the oil contained in the cover will adhere to the interlocking metal fittings and the return spring member, causing malfunction (blocking malfunction of the shield plate) in the event of a fire.

Therefore, the problem to be solved by the present invention is to provide a fire damper that is less likely to malfunction due to adhesion of grease contained in soot.

A fire damper according to the present invention comprises a mounting frame installed at the entrance of an exhaust duct in an exhaust hood, a damper body mounted on the mounting frame, and a fixing mechanism detachably fixing the damper body to the mounting frame. a fire damper comprising
The damper body is
a frame-shaped member attached to the mounting frame and forming an exhaust path;
a plurality of shutter members rotatably arranged via a plurality of support shafts in the exhaust passage within the frame-shaped member;
a connecting member for synchronizing the rotational motion of the plurality of shutter members;
an elastic member that biases the shutter member in a closing direction;
locking means for holding the shutter member in an open state;
starting means for releasing the locking means when the temperature in the vicinity of the damper body exceeds a set temperature;
disposing the connecting member and the elastic member in a side chamber formed outside the exhaust flow path and isolated from the exhaust flow path ;
The side chamber portion is formed by attaching a cover member having a U-shaped cross section along the casing side plate that constitutes the side portion of the main body. It is characterized by being closed by a casing front plate and a casing back plate that constitute the front part and the back part of the.

With such a configuration, it is possible to prevent the oil and fat components contained in the exhaust gas passing through the exhaust passage from adhering to the connecting member and the elastic member, thereby preventing the connecting member and the elastic member from sticking. Therefore, it is possible to prevent the shutter member from failing to close in an emergency (when a flame occurs), thereby improving the reliability of the fire damper. Also, when a fire occurs, the elastic member can be prevented from being directly exposed to the flame, so the closing force of the shutter member can be maintained.

In the fire damper, it is desirable to arrange the plurality of elastic members at a plurality of different positions.

With such a configuration, it is possible to prevent the closing operation of the shutter member from being hindered due to the deterioration (loss) of the biasing function of the elastic member (the closing function of the shutter member) due to the adhesion of oil and fat components in the exhaust gas. can do.

In the fire damper, it is preferable that the fixing mechanism includes a separation mechanism that moves at least a portion of the damper body away from the mounting frame when the fixing mechanism is released.

With such a configuration, even when oil and fat components contained in the exhaust gas passing through the exhaust flow path adhere to the gap between the mounting frame and the damper body, making it difficult to separate the two. Since at least a part of the damper body is separated from the mounting frame by performing the releasing operation of the fixing mechanism, the work of removing the damper body is facilitated and maintainability is improved.

In the fire damper,
The shaft of the shutter member is
a tubular body portion in which the support shaft penetrates the frame-shaped member;
a tubular body crushing portion positioned inside the frame member in a continuous state with one end of the tubular body portion;
an L-shaped tubular body crushing portion positioned outside the frame-shaped member in a continuous state with the other end of the tubular body portion and bent in a direction intersecting with the tubular body portion; is desirable.

With such a configuration, the connecting portion with the shutter member and the connecting portion with the connecting member for synchronizing the operation of the shutter member can be provided by press working and bending the tubular material. , the support shaft of the shutter member can be formed, so the number of parts can be reduced.

In the fire damper, it is desirable that the damper body is formed by connecting at least part of a plurality of constituent members with a screw mechanism.

With such a configuration, the damper body can be disassembled into a plurality of constituent members by loosening the screws and screws that make up the screw mechanism. It becomes easy to clean and remove oil and fat components, and thorough cleaning can be achieved.

According to the present invention, it is possible to provide a fire damper that is less likely to malfunction due to adhesion of grease contained in soot.

1 is a partially omitted perspective view of a fire damper that is an embodiment of the present invention in an open state; FIG. FIG. 2 is an exploded perspective view of the fire damper shown in FIG. 1; It is a bottom view of the fire damper seen from the arrow A direction in FIG. It is a top view of the fire damper seen from the arrow B direction in FIG. FIG. 5 is a partially omitted perspective view of a portion indicated by an arrow X in FIG. 4; It is a front view of the fire damper seen from the arrow C direction in FIG. It is a rear view of the fire damper seen from the arrow D direction in FIG. It is a right view of the fire damper seen from the arrow E direction in FIG. It is a left view of the fire damper seen from the arrow F direction in FIG. FIG. 5 is a cross-sectional view taken along line GG in FIG. 4; 5 is a cross-sectional view taken along line HH in FIG. 4; FIG. It is a left view of a fire damper in the state where the side cover was removed. FIG. 2 is a partially omitted perspective view when the fire damper shown in FIG. 1 is in a closed state; FIG. 2 is a functional explanatory diagram of a fixing mechanism that constitutes the fire damper shown in FIG. 1; 1. It is explanatory drawing which shows the attachment or detachment process of the damper main body with respect to a mounting frame in the fire damper shown in FIG.

A fire damper 1 according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 15. FIG.

As shown in FIGS. 1 to 4, the fire damper 1 includes a mounting frame 2 installed at an entrance (not shown) of an exhaust duct in an exhaust hood, a damper body 3 attached to the mounting frame 2, and a damper body 3 is detachably fixed to the mounting frame 2, and a crescent lock 6 and a hinge-like engaging portion 7 are provided.

As shown in FIGS. 1 to 4 and FIGS. 10 to 12, the damper body 3 includes a rectangular frame member 30 attached to the mounting frame 2 and forming an exhaust path R, and an exhaust flow inside the frame member 30. A plurality of shutter members 32 rotatably arranged on the path R via a plurality of support shafts 31, a connecting member 33 for synchronizing the rotational motion of the plurality of shutter members 32, and the shutter members 32 in the closing direction S. A temperature fuse 37 having a spring 34 that is an elastic member for biasing, and a ratchet member 35 that is locking means for holding the shutter member 32 in an open state and a hook portion 36 is provided. The thermal fuse 37 is a starting means for releasing the locking means when the temperature near the damper body 3 exceeds a set temperature.

As shown in FIG. 11, the connecting member 33 and the elastic member 34 are provided in the side chambers 40 formed on the left and right outer sides of the exhaust flow path R in a state of being isolated from the exhaust flow path R by the casing side plates 38b. are placed. The side chamber portion 40 is formed by attaching a cover member 39 having a U-shaped cross section along the casing side plates 38b forming the left and right side portions of the damper body 3. As shown in FIG. The front and back portions of the side chamber 40 are closed by a casing front plate 38a and a casing back plate 38c that constitute the front and back portions of the damper body 3, respectively.

As shown in FIGS. 4, 5, and 11, the support shaft 31 of the shutter member 32 includes a tubular body portion 31a through which the support shaft 31 penetrates the casing side plate 38b of the frame member 30 and the stopper member 41, and a tubular body portion 31a. A tubular crushing portion 31c positioned inside the frame-shaped member 30 in continuity with one end 31b of the portion 31a, and a tubular body crushing portion 31c positioned outside the frame-shaped member 30 in continuity with the other end 31d of the tubular body 31a. It also has an L-shaped tubular body crushing portion 31e bent in a direction perpendicular to the tubular body portion 31a.

As shown in FIG. 5, a stopper member 41 having an L-shaped cross section is attached to the inner surface of the casing side plate 38b. When the shutter member 32 is closed, both edges of the shutter member 32 come into contact with the stopper member 41 . The casing side plate 38b is provided with an elongated hole 38d having a size through which the tubular member crushing portion 31c of the support shaft 31 can pass, with the long diameter direction directed vertically. The stopper member 41 includes a round hole portion 42a having an inner diameter through which the tubular body portion 31a of the support shaft 31 can pass, and a tubular body crushing portion 31c of the support shaft 31 which is continuous with the lower portion of the round hole portion 42a and can pass through. An opening 42 is provided with a square hole 42b having a size. 38d of long holes and the opening part 42 are arrange|positioned so that the part may be connected, and the tubular body part 31a of the support shaft 31 penetrates this communication part rotatably.

As shown in FIGS. 3 and 4, the tubular member crushing portion 31c of the support shaft 31 positioned inside the frame member 30 is fixed to the end portion of the shutter member 32, and as shown in FIGS. The L-shaped tube crushing portion 31 e of the support shaft 31 positioned inside the side chamber portion 40 outside the shaped member 30 is supported by the connecting member 33 via the shaft 43 .

As shown in FIG. 6, the crescent lock 6 is attached to a crescent member 6b rotatably attached to the front plate 2a of the mounting frame 2 via a support shaft 6a, and to the casing front plate 38a of the damper body 3. and a locking pin 6c. When the crescent member 6b is rotated forward/reverse around the support shaft 6a, the arc-shaped notch 6d provided in the crescent member 6b engages/disengages from the locking pin 6c. A distance T from the arc portion 6e of the crescent member 6b to the support shaft 6a increases continuously toward the opening end of the arc cutout portion 6d.

When the crescent member 6b is rotated counterclockwise around the support shaft 6a, and the locking pin 6c is fitted from the open end side of the arc-shaped cutout portion 6d of the crescent member 6b toward the blind end side, a hinge described later is formed. The damper main body 3 is fixed to the mounting frame 2 by the cooperative action with the shaped engaging portion 7 .

As shown in FIGS. 7 to 10, the hinge-shaped engaging portion 7 includes a groove-shaped member 71 having a J-shaped cross section attached along the longitudinal direction of the back plate 2c of the mounting frame 2, and a damper body 3. A suspension member 72 having a hook-shaped cross section is attached along the longitudinal direction of the casing back plate 38c, and has a hinge function as will be described later. By engaging the hanging member 72 with the groove member 71 so as to be hooked, the damper body 3 is fixed to the mounting frame 2 by the cooperative action with the crescent lock 6 described above.

As shown in FIG. 1, in the normal fire damper 1, a plurality of shutter members 32 stand parallel to each other (open state) by locking means (an engagement mechanism between the ratchet member 35 and the hook portion 36). Therefore, the oily smoke and water vapor generated below the exhaust hood during cooking pass through the exhaust path R and are discharged via the exhaust duct.

On the other hand, when a fire breaks out and the temperature in the vicinity of the damper body 3 exceeds the set temperature, the temperature fuse 37 shown in FIG. 12(b) and 13, the plurality of shutter members 32, which were in the open state, are all closed by the biasing force of the spring 34. As shown in FIG. As a result, the exhaust passage R (see FIG. 1) is closed, so that the flame caused by the fire can be prevented from flowing into the exhaust duct.

As shown in FIGS. 11 and 12, in the fire damper 1 of the present embodiment, the connecting member 33 and the spring (elastic member) 34 are arranged inside the side chamber portion 40 located outside the exhaust passage R. , it is possible to prevent oil and fat components contained in the exhaust gas passing through the exhaust passage R from adhering to the connecting member 33 and the spring 34, thereby preventing the connecting member 33 and the spring 34 from sticking. Therefore, it is possible to prevent the shutter member 32 from malfunctioning in the closing operation in an emergency (when a flame occurs), and the reliability of the fire damper 1 is improved. Also, when a fire occurs, the spring 34 can be prevented from being directly exposed to the flame, so the closing force of the shutter member 32 can be maintained.

In the fire damper 1, since the plurality of springs 34 are arranged in the plurality of side chambers 40 provided on the left and right sides of the exhaust flow path R, the biasing of the springs 34 due to the adherence of oil and fat components in the exhaust gas is prevented. It is possible to prevent obstruction of the closing operation of the shutter member 32 due to deterioration (loss) of the function (the closing function of the shutter member 32).

In the fire damper 1, the crescent lock 6, which constitutes a part of the mechanism for fixing the damper body 3 to the mounting frame 2, has the structure described with reference to FIG. Therefore, when the crescent member 6b is rotated clockwise around the support shaft 6a to unlock the crescent lock 6 in the locked state as shown in FIG. 14(a), the circular arc portion 6e (FIG. ) continuously presses the locking pin 6c downward. As a result, as shown in FIGS. 14(b) and 14(c), the mounting frame 2 and the damper body 3 are separated to form a gap K, which gradually widens.

Therefore, after the crescent member 6b is turned to the upper limit and separated from the locking pin 6c, as shown in FIG. The damper body 3 can be removed from the mounting frame 2 by separating the engaging portion 7 .

As described above, even in the case where oil and fat components contained in the exhaust gas passing through the exhaust passage R adhere to the gap between the mounting frame 2 and the damper main body 3 and make it difficult to separate the two, the crescent can be prevented. When the lock 6 is released, the front portion of the damper body 3 is separated from the mounting frame 2, so that the damper body 3 can be easily removed and maintainability is good.

In the fire damper 1, as described with reference to FIGS. and a portion 31e. Therefore, by subjecting the tubular material to press work and bending work, the connecting portion (pipe crushing portion 31c) with the shutter member 32 and the connecting portion (L It is possible to form the support shaft 31 of the shutter member 32, which also includes the character-shaped tubular body crushing portion 31e), and to reduce the number of parts.

In the fire damper 1, the damper main body 3 is formed by connecting a plurality of constituent members with a screw mechanism. For example, as shown in FIG. 2, the cover member 39 constituting the damper body 3 is fixed to the casing front plate 38a and the casing rear plate 38c using a plurality of screws N1, and the casing side plate 38b is fixed using a plurality of screws N2. are fixed to the casing front plate 38a and the casing rear plate 38c. Further, as shown in FIGS. 3 and 4, the tubular body crushing portion 31c of the support shaft 31 is connected to the shutter member 32 by a plurality of screws N3.

Although not shown, the left cover member 39 of the frame-shaped member 30 in FIG. 2, the casing side plate 38b (not shown) on the right side of the frame-shaped member 30 in FIG. It is

With such a configuration, the damper body 3 can be disassembled into a plurality of constituent members by loosening the screws N1, N2, and N3. It is easy to clean and remove fats and oils, and thorough cleaning can be achieved. Note that the portions to be connected by the screw mechanism are not limited to the portions to be connected by the screws N1, N2, and N3 described above, so that other structural members can also be connected by the screw mechanism.

The fire damper 1 described with reference to FIGS. 1 to 15 is an example of the fire damper according to the present invention, and the fire damper according to the present invention is not limited to the fire damper 1 described above.

INDUSTRIAL APPLICABILITY A fire damper according to the present invention can be widely used in industrial fields such as the construction industry as a part of fire prevention equipment for a kitchen in a building.

Reference Signs List 1 fire damper 2 mounting frame 2a front plate 2c rear plate 3 damper main body 6 crescent lock 6a, 31 spindle 6b crescent member 6c locking pin 6d arc-shaped notch 6e arc-shaped portion 30 frame-shaped member 31a pipe portion 31b, 31d End 31c Tube crushing part 31e L-shaped tube crushing part 32 Shutter member 33 Connecting member 34 Spring (elastic member)
35 Ratchet member 36 Hook portion 37 Thermal fuse 38a Casing front plate 38b Casing side plate 38c Casing rear plate 38d Long hole 39 Cover member 40 Side chamber portion 41 Stopper member 42 Opening 42a Round hole 42b Square hole 43 Shaft 71 Groove Member 72 Hanging member N1, N2, N3 Screw K Gap R Exhaust flow path S Closing direction T Distance

Claims (5)

A fire damper comprising: a mounting frame installed at the entrance of an exhaust duct in an exhaust hood; a damper body mounted on the mounting frame; and a fixing mechanism detachably fixing the damper body to the mounting frame. hand,
The damper body is
a frame-shaped member attached to the mounting frame and forming an exhaust path;
a plurality of shutter members rotatably arranged via a plurality of support shafts in the exhaust passage within the frame-shaped member;
a connecting member for synchronizing the rotational motion of the plurality of shutter members;
an elastic member that biases the shutter member in a closing direction;
locking means for holding the shutter member in an open state;
starting means for releasing the locking means when the temperature in the vicinity of the damper body exceeds a set temperature;
disposing the connecting member and the elastic member in a side chamber formed outside the exhaust flow path and isolated from the exhaust flow path ;
The side chamber portion is formed by attaching a cover member having a U-shaped cross section along the casing side plate that constitutes the side portion of the main body. A fire damper closed by a casing front plate and a casing rear plate, which constitute the front and rear parts of the fire damper. 2. A fire damper according to claim 1, wherein a plurality of said elastic members are arranged at a plurality of different positions. 3. A fire damper according to claim 1, wherein said fixing mechanism comprises a separating mechanism for moving at least a portion of said damper body in a direction away from said mounting frame in accordance with a releasing operation of said fixing mechanism. The shaft of the shutter member is
a tubular body portion in which the support shaft penetrates the frame-shaped member;
a tubular body crushing portion positioned inside the frame member in a continuous state with one end of the tubular body portion;
and an L-shaped tubular body crushing portion that is positioned outside the frame-shaped member in a continuous state with the other end of the tubular body portion and that is bent in a direction intersecting with the tubular body portion. 4. The fire damper according to any one of 3. The fire damper according to any one of claims 1 to 4, wherein the damper body is formed by connecting at least part of a plurality of constituent members with a screw mechanism.

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