JPH0861766A - Ventilation fan with fireproof damper and weather cover with fireproof damper for ventilation fan - Google Patents

Abstract

PURPOSE: To provide a ventilation fan which enables the closing of an air path accurately with a fireproof damper even when a fan rotates to generate an air current CONSTITUTION: As temperature in an air path 30 rises, a thermal fuse 28 burns out and a damper 24 loses a support. The damper 24 turns in the direction of closing the air path 30 by a dead load. At the same time, a lever 26 contacting the rear of the damper 24 receives a moment by the own weight and an energizing force of springs 48 and 50 applied between the tip of the lever 26 and the tip of the damper 24 to generate a force for pushing the damper 24 from the rear thereof. The force increases as the damper turns in the direction of closing and is allowed to resist a force by an air current generated with a fan 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation fan for ventilating a building indoors, and more particularly to a mechanism for closing a fireproof damper that blocks a ventilation passage of the ventilation fan to prevent the spread of fire in the event of a fire.

[0002]

2. Description of the Related Art Conventionally, a ventilation fan provided with an opening in a wall of a building and a fan attached to the opening has been used for indoor ventilation. A weather cover is provided on the outside of the ventilation fan to prevent wind and rain from entering the room. Further, in order to prevent the spread of fire in the event of a fire, a ventilation fan with a fire damper having a damper that blocks the ventilation passage is also used.

FIG. 5 shows a conventional ventilation fan with a fireproof damper. A wall 1 of the building has an opening 1 of a predetermined size.
2 are provided. A frame 14 is fixed to the inside of the opening 12, and a motor 16 is attached to the frame 14.
Has been fixed. A fan 18 is fixed to the shaft of the motor 16, and intake or exhaust is performed by the rotation of the fan 18. Further, on the outside of the opening 12, a frame body 20 fixed to the wall 10 and a weather cover 22 supported by the frame body 20 for preventing wind and rain from entering the room.
Is provided. Inside the weather cover 22, a damper 24 rotatably supported by the frame body 20 at the upper end, and one end rotatably supported by the tip portion of the weather cover 22 and the other end contacting the back surface of the damper 24. The lever 26 that touches is stored. The damper 24 is normally held by the thermal fuse 28 at a position where the ventilation passage 30 is opened. That is, since the thermal fuse 28 is spanned between the fuse holder 32 whose one end is rotatably supported by the lever 26 and the hook 34 hooked on the damper 24, the fuse holder 32 contacts the tip of the damper 24. In contact with each other, the damper 24 is prevented from rotating in the direction of closing the ventilation passage.

When the temperature in the ventilation passage 30 rises due to a fire or the like, the thermal fuse 28 melts and the fuse holder 32
Loses its support and rotates clockwise in the figure due to its own weight to release the holding state of the damper 24. As a result, the damper 24 rotates counterclockwise in the figure until it comes into contact with the frame body 20 due to its own weight and the weight of the lever 26, and closes the ventilation passage. At this time, since the lever 26 is in contact with the back surface of the damper 24, the damper 24 cannot be easily opened and it is possible to prevent the flame from blowing out from the room.

FIG. 6 shows another conventional example. The configuration on the indoor side has the same configuration as the ventilation fan shown in FIG. The structure of the outdoor side is different from the above-mentioned conventional example in the structure of the weather cover 36 and the damper 38 accommodated therein. The damper 38 is a weather cover 36.
The weather cover 3 is rotatably supported at the tip of the
The fuse holder 44 provided on the damper 38 is supported by the hook 40 and the thermal fuse 42 that are suspended from the upper end of 6. As a result, the damper 38 is held at the position where the air passage 46 is opened.

In case of a fire or the like, as in the above-mentioned conventional example,
The thermal fuse 42 is melted and the holding state of the damper 38 is released. Then, the damper 38 rotates in the clockwise direction in the drawing, and the ventilation path 46 is opened at the opening of the weather cover 36.
To block.

[0007]

The conventional ventilation fan is constructed as described above, and when the temperature fuses 28 and 42 are blown, the dampers 24 and 38 act to block the ventilation passages 30 and 46. At this time, When the air flow is generated by the fan 18, there is a problem that the dampers 24 and 38 are not closed completely. For example, in the device shown in FIG. 5, when an air flow that exhausts the air in the room is generated, this air flow generates a force that rotates the damper 24 in the clockwise direction. This force increases as the damper 24 closes, so that the damper 24 does not completely close and the ventilation passage 30 is not closed.
Further, in the device shown in FIG. 6, the damper 38 does not become completely closed when the airflow for inhaling the outside air is generated in the room.

[0008] To solve this problem,
Japanese Patent No. 194232 discloses a device for generating a force (closing force) for closing a damper by a biasing force of a spring. However, in this device, the closing force due to the biasing force of the spring is maximum when the damper is held in the open state by the thermal fuse, and since this acts directly on the thermal fuse, the strength of the thermal fuse is sufficient. Need to take On the other hand, since the thermal fuse needs to be blown immediately when the temperature exceeds a predetermined temperature,
There are also restrictions on increasing strength. Therefore, when the air volume generated by the fan is large, or when the size of the ventilation fan is large and the area of the damper is large, there is a problem that the urging force of the spring cannot be increased correspondingly.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to surely close the damper to close the ventilation passage even when the fan of the ventilation fan is generating an air flow. It is an object of the present invention to provide a ventilation fan or a weather cover that includes a damper having an opening / closing mechanism that is capable of suppressing the force that is normally applied to the thermal fuse.

[0010]

In order to achieve the above-mentioned object, a ventilation fan with a fireproof damper according to the present invention includes a damper rotatably provided in a ventilation passage and an opening state of the ventilation passage at a normal time. And a temperature fuse that holds the damper at a position where the temperature fuse in the ventilation passage rises and the temperature fuse melts, and the damper blocks the ventilation passage. Rotatably provided inside,
A lever whose tip contacts the rear surface of the damper; and a spring which is stretched between the vicinity of the damper tip and the vicinity of the lever tip and which applies a pressing force to the lever to press the lever rear surface against the damper back surface. The pressing force of the lever increases as the damper rotates in the closing direction.

Further, the tip of the lever abuts near the center of the rear surface of the damper in the width direction, and two springs are provided, and one spring is stretched between the left end near the tip of the damper and the tip of the lever. Alternatively, the other spring may be stretched between the right end near the damper tip and the lever tip.

Further, another ventilation fan with a fire damper according to the present invention is a damper provided rotatably in the ventilation passage,
A temperature fuse that holds the damper in a position that normally opens the ventilation passage, and the temperature fuse melts when the temperature in the ventilation passage rises, and the damper closes the ventilation passage. A ventilation fan that is rotatably provided in the ventilation passage and has a tip that abuts against the damper back surface, and a lever that is provided on the lever and that presses the lever tip with its own weight to press the damper back surface. With a weight, as the damper rotates in the closing direction,
The pressing force of the lever is increased.

Further, the weather cover with a fireproof damper for a ventilation fan according to the present invention is used together with a ventilation fan and is provided at a position where the damper is rotatably provided in the ventilation passage and the ventilation passage is normally opened. A thermal cover with a damper that holds a damper, wherein the temperature fuse melts down when the temperature in the ventilation passage rises, and the damper closes the ventilation passage with a fire damper. A lever that is rotatably provided and has a tip that abuts against the back surface of the damper, and is stretched between a portion near the tip of the damper and a portion near the tip of the lever. And a spring for applying pressure.

[0014]

According to the present invention having the above-mentioned structure, when the closing force for closing the damper by the spring is generated, the moment to the lever generated by the biasing force of the spring as the damper is closed. And the closing force of the damper increases. Therefore, it is possible to close the damper and close the ventilation passage against the force of opening the damper due to the air flow that increases as the damper closes. Further, when the damper is held in the open state, the closing force of the damper is minimum, and a large force is not applied to the thermal fuse.

If two springs are provided and one is stretched between the right end of the damper and the tip of the lever and the other is stretched between the right end of the damper and the tip of the lever, the spring is Since the length can be increased, a sufficient stroke can be secured and a required spring tension force can be obtained.

Further, in the case of generating a closing force for closing the damper by a weight provided on the lever,
As the damper closes, the weight increases the momentum on the lever. Therefore, it is possible to close the damper and close the ventilation passage against the force of opening the damper due to the air flow that increases as the damper closes.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a ventilation fan according to the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view of the apparatus of this embodiment in a normal state, and FIG. 2 is a side sectional view of a state in which a damper is closed due to a fire or the like. FIG. 3 is a partially cutaway perspective view of the apparatus of this embodiment as seen from the outside of the room, and particularly shows a state in which the damper is closed. In the above figures, the same components as those of the conventional device shown in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted.

A feature of this embodiment is that springs 48 and 50 are stretched between the damper 24 and the lever 26. More specifically, as shown in FIG. 3, the springs 48 and 50 are arranged between the left and right end portions 24a and 24b of the damper 24 in the width direction and the tip 26a of the lever 26 in a substantially inverted V-shaped pulling direction. It is stretched and stretched. Therefore, the biasing force of these springs 48, 50 acts as a force for attracting the lever tip 26a to the tip of the damper 24.

In the normal state shown in FIG. 1, the springs 48,
Rotating shaft 26b of lever 26 generated by the urging force of 50
The rotating moment is relatively small, as can be seen from the fact that the direction of the vector of the urging force is in the vicinity of the rotating shaft 26b. Therefore, normally, the lever 26 moves the damper 2
The force (closing force) that presses 4 is small, and the moment that rotates the damper 24 in the closing direction is also small. Therefore, the force acting on the thermal fuse 28 is small, and the thermal fuse 2
It can be seen that the strength of No. 8 does not need to be so large.

When the temperature in the ventilation passage exceeds a predetermined value due to a fire or the like, the thermal fuse 28 is blown. As described above, since the thermal fuse 28 is required to have a relatively small strength, it can be formed in a thin line shape, and thus, the thermal fuse 28 immediately reacts to a temperature rise and blows. When the thermal fuse is blown, the fuse holder 32
Is rotated clockwise with respect to the lever 26 by its own weight or a torsion spring 52. This allows the damper 24
Loses its support and rotates counterclockwise due to the weight of the damper 24 and the lever 26 and the closing force of the lever 26 by the springs 48 and 50.

With the rotation of the damper 24, the lever tip 2
6a contacts the back surface of the damper 24 and gradually moves toward the tip of the damper 24. Since the springs 48 and 50 are stretched between the lever tip and the damper tip, the damper 2 is always
4 is in contact with the back surface of the spring 4, so that the springs 48,
The direction of the urging force vector of 50 moves away from the lever rotation shaft 26b as the damper rotates. Therefore,
The moment that rotates the lever 26 gradually increases, and the closing force on the damper 24 also increases as the damper 24 itself rotates. The damper 24 increases as the closing force increases.
The moment that rotates the counterclockwise is also increased, and the damper 24 is closed against the air flow generated by the fan 18. In other words, the urging force of the springs 48 and 50 is set so as to generate a moment larger than the moment of opening the damper 24 generated by the air flow.

In this way, the damper 24 closes the ventilation passage 30 as shown in FIG. Further, when the damper 24 is once closed, the lever 26 becomes a sticking rod and prevents the damper 24 from opening again. Therefore, it is possible to reliably prevent the flame from the room from being blown out from the opening 12 provided with the ventilation fan.

Further, as shown in FIG. 3, two springs 48,
By arranging 50 in an inverted V shape, it is possible to use a spring with a longer free length, and it is possible to achieve the required tension in a wider range of stroke. Of course, if there are no dimensional restrictions, even if a spring is stretched between the lever tip and the vicinity of the center of the damper tip, the required tension can be achieved in a sufficient range. In this case, 1 spring
Since it can be a book, the number of parts and the cost can be reduced.

FIG. 4 shows another embodiment according to the invention. In the present embodiment, the same components as those shown in FIG. 5 are designated by the same reference numerals and the description thereof will be omitted. A characteristic of this embodiment is that a weight 54 is provided on a part of the lever 26. The weight provided on the damper 24 side arm of the lever 26 having a substantially "V" shape generates a force for closing the damper 24 due to its weight. The characteristic feature of the present embodiment is that the moment that the weight 54 rotates the lever 26 increases as the damper 24 closes, and thus the force acting on the damper 24 by the air flow that increases as the damper 24 closes. Can withstand. In the closed state, the lever 26 functions as a sticking rod and does not easily allow the damper 24 to reopen, as in the above-described embodiment shown in FIG.

[0026]

As described above, according to the present invention, when the closing force for closing the damper by the spring is generated, the moment to the lever generated by the biasing force of the spring increases as the damper closes. However, the closing force of the damper increases. Therefore, it is possible to close the damper and close the ventilation passage against the force of opening the damper due to the air flow that increases as the damper closes. Further, when the damper is held in the open state, the closing force of the damper is minimum, and a large force is not applied to the thermal fuse.

If two springs are provided, one is stretched between the right end of the damper and the tip of the lever, and the other is stretched between the right end of the damper and the tip of the lever, the spring is Since the length can be increased, a sufficient stroke can be secured and a required spring tension force can be obtained.

Further, in the case where the weight provided on the lever generates a closing force for closing the damper,
As the damper closes, the weight increases the momentum on the lever. Therefore, it is possible to close the damper and close the ventilation passage against the force of opening the damper due to the air flow that increases as the damper closes.

As described above, according to the present invention, the ventilation passage of the ventilation fan can be surely closed even when the fan is rotating and the airflow is generated, so that the spread of fire in the event of a fire can be prevented.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view when the damper of the embodiment shown in FIG. 1 closes an air passage.

FIG. 3 is a perspective view in which a part of the embodiment shown in FIG. 1 is cut away.

FIG. 4 is a side sectional view of another embodiment according to the present invention.

FIG. 5 is a side sectional view of a conventional device.

FIG. 6 is a side sectional view of another conventional device.

[Explanation of symbols]

 16 Motor 18 Fan 22 Weather Cover 24 Damper 26 Lever 28 Temperature Fuse 30 Ventilation Path 48, 50 Spring 54 Weight

Claims (4)

[Claims] 1. A damper provided rotatably in the ventilation passage and a temperature fuse for holding the damper at a position where the ventilation passage is normally opened, and a temperature inside the ventilation passage is controlled. When the temperature fuse rises, the temperature fuse melts, and the damper is a ventilation fan with a fire damper that closes the ventilation passage, the lever being rotatably provided in the ventilation passage, and the tip of which comes in contact with the rear surface of the damper, A spring that is stretched between the vicinity of the tip of the damper and the vicinity of the tip of the lever, and that has a spring that applies a pressing force to the lever so that the lever tip presses the rear surface of the damper. Therefore, the pressing force by the lever increases, and the ventilation fan with a fireproof damper is characterized. 2. The ventilation fan with a fire damper according to claim 1, wherein a tip of the lever abuts on a rear surface of the damper near a center in a width direction, two springs are provided, and one spring is provided near a tip of the damper. A ventilation fan with a fire damper, which is stretched between a left end and a lever tip, and the other spring is stretched between a right end and a lever tip near the damper tip. 3. A damper provided rotatably in the ventilation passage, and a temperature fuse for holding the damper in a position where the ventilation passage is normally opened, and a temperature inside the ventilation passage is controlled. When the temperature fuse rises, the temperature fuse melts, and the damper is a ventilation fan with a fire damper that closes the ventilation passage, the lever being rotatably provided in the ventilation passage, and the tip of which comes in contact with the rear surface of the damper, A weight provided on the lever, the tip of the lever applying a pressing force for pressing the rear surface of the damper by its own weight, and the pressing force of the lever increases as the damper rotates in the closing direction. A ventilation fan with a characteristic fire damper. 4. A ventilation fan, comprising a damper rotatably provided in the ventilation passage, and a thermal fuse for holding the damper at a position where the ventilation passage is normally opened. A weather cover with a ventilation damper for a ventilation fan that blows off the temperature fuse when the temperature in the passage rises, and the damper closes the ventilation passage.The weather cover is rotatably provided in the ventilation passage and has a tip. A lever that abuts against the rear surface of the damper; and a spring that is stretched between the vicinity of the tip of the damper and the vicinity of the end of the lever, and that applies a pressing force to the lever to press the rear surface of the damper to the lever. A weather cover with a fireproof damper for a ventilation fan, wherein the pressing force of the lever increases as the damper rotates in the closing direction.