JPH0341734B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to the structure of a ceiling ventilation opening having a fire damper that closes in the event of a fire.

[Background Art] A conventional ceiling ventilation opening with a fire damper was constructed as shown in FIG. In other words, a gap b is provided in an opening a in the ceiling, a cylindrical outer frame c is attached along the opening a, a fire damper d that can be opened and closed is placed inside the outer frame c, and the fire damper d is folded. The temperature was maintained at fuse e to ensure that the temperature remained constant. Normally, as shown in Figure 10, the air that enters the room i from the wall f or under the floor h enters the attic j through the opening a, and from the attic j passes through the ventilation opening m in the roof k, and the air is released outdoors. Houses are becoming more ventilated and ventilated. Further, in the event of a fire, the temperature fuse e melts and the fire damper d expands to close the inside of the outer frame c. However, this conventional example has the disadvantage that the opening a is always open to provide ventilation even when ventilation is not necessary.

[Object of the Invention] The present invention has been made in view of the above points, and an object of the present invention is to close the opening so that ventilation is not performed when ventilation is not necessary, and to reduce the amount of ventilation. can be adjusted freely,
Furthermore, to provide a ceiling ventilation opening with a fireproof damper that can be closed with a fireproof damper in the event of a fire even if the opening can be closed or the ventilation amount can be adjusted so as not to prevent ventilation.

[Disclosure of the Invention] The ceiling ventilation opening with a fire damper of the present invention includes an opening 2 provided in a ceiling 1, an outer frame 3 provided along the opening 2, and a lid body 4 of a size capable of closing the opening 2 attached to the opening 2. A female threaded portion 6 is provided on the frame 5 disposed below and constructed between the outer frames 3, and a male threaded portion 8 of a support shaft 7 protruding upward from the lid 4 is screwed into the female threaded portion 6 to close the lid 4. A cylindrical fire damper 9 that is movable up and down and can close the gap between the opening 2 and the lid 4 is disposed within the outer frame 3, and a temperature fuse 10 that melts in the event of a fire and releases support for the fire damper 9. Fire damper 9
is supported on the outer frame 3, and the drawbacks of the conventional example are solved by configuring it as described above. That is, a lid 4 large enough to close the opening 2 is placed below the opening 2, a female thread 6 is provided on the frame 5 installed between the outer frames 3, and the lid 4 is
By screwing the male threaded portion 8 of the support shaft 7, which is provided to protrude upward, into the female threaded portion 6 to make the lid 4 vertically movable, the lid 4 can be moved so as to come into contact with the lower surface of the ceiling 1. This makes it possible to close the opening 2 to prevent ventilation, and also to adjust the vertical position of the lid 4 to adjust the gap between the opening 2 and the lid 4, thereby adjusting the amount of ventilation. Furthermore, a cylindrical fireproof tamper 9 that can close the gap between the opening 2 and the lid body 4 is arranged within the outer frame 3, and a temperature fuse 10 that melts in the event of a fire and releases the support of the fireproof damper 9.
By supporting the fire damper 9 on the outer frame 3, the temperature fuse 10 melts in the event of a fire, the fire damper 9 falls from the outer frame 3, and is blocked to prevent ventilation, making it possible to prevent fires. be.

The present invention will be explained in detail below with reference to Examples.

First, the embodiment shown in FIGS. 1 and 2 will be described.
An opening 2 is provided in the ceiling 1, and an outer frame 3 is attached to the opening 2 along the entire circumference of the opening 2 on the back side of the ceiling. A frame 5 is installed between the upper portions of the outer frame 3, and a female threaded portion 6 is provided at the center of the frame 5. This female threaded portion 6 is a square thread. A lid 4 having a larger diameter than the opening 2 is arranged below the opening 2, and the lower end of a support shaft 7 facing in the vertical direction is fixed to the center of the lid 4 with a screw 11. A male screw portion 8 made of a square screw is provided on the upper outer periphery of the screw 7. The male threaded portion 8 is the female threaded portion 6 mentioned above.
The cover body 4 is screwed into the body, so that the cover body 4 can be moved up and down by rotating the cover body 4. A stopper 12 is provided at the upper end of the support shaft 7 to prevent the support shaft 7 from coming off from the female threaded portion 6. The height H between the lower surface of the ceiling 1 and the upper surface of the lid 4 when the lid 4 is lowered the most is equal to the threading distance L of the male screw portion 8. A cylindrical fire damper 9 is arranged along the inner periphery of the outer frame 3, and a connecting portion 13 extending from the outer frame 3 and a connecting portion 14 extending from the fire damper 9 are arranged on the inner periphery of the outer frame 3. are connected by a temperature fuse 10. This temperature fuse 10
The material melts and is cut when it reaches a predetermined temperature. In this embodiment, the opening 2 is circular, the outer frame 2 and the fire damper 9 are cylindrical, and the lid 4 is circular.
Although the opening 2 is disc-shaped, the opening 2 may be square. When the opening 2 is square, the outer frame 3 and the fire damper 9 have a square tube shape, and the lid 4 has a square plate shape.
Furthermore, the ceiling 1 and the lid 4 are made of fireproof material. In this way, a ceiling ventilation opening with a fire damper is formed, and the lid 4 is normally located below the opening 2, and indoor air flows through the opening 2 from the gap between the lid 4 and the ceiling 1 into the attic. Ventilation and ventilation of the room is carried out. At this time, by rotating the lid 4 and screwing the male threaded part 8 against the female threaded part 66, the lid 4 can be raised and lowered, and the ventilation amount can be adjusted by changing the gap between the ceiling 1 and the lid 4. . In addition, when ventilation is not required, move the lid 4 to the top and
is brought into contact with the lower surface of the ceiling 1 to close the opening 2. In addition, if a fire occurs while ventilation is in place, the flame A and heat of the fire will melt and cut the temperature fuse 10, causing the fire damper 9 to fall under its own weight and open the opening 2 as shown in Figure 2. The gap with the ceiling 1 is closed.

Next, the embodiments shown in FIGS. 3, 4, and 5 will be described. A rod 15 is suspended downward from the outer edge of the frame 5, and a fire damper 9 is provided.
A rod 15 is inserted into a through hole 17 provided in an upper flange 16 so as to project from the inner periphery of the rod 15 so as to be vertically movable. A bulge 18 is provided at the lower end of the rod 15, and when the fire damper 9 is lowered, the bulge 18 does not pass through the through hole 17 and is inserted into the upper flange 16.
is now locked. A compression spring 19 is wound around the outer circumference of the rod 15, and a compression spring 19 is wound between the frame 5 and the upper flange 16.
A compression spring 19 biases the fire damper 9 downward. The fire damper 9 is pushed upward against the compression spring 19, and in this state the through hole 17 and the rod 15 are fixed with a temperature fuse 10. In this embodiment as well, ventilation is carried out in the same manner as in the embodiments shown in FIGS. 1 and 2. Now, if a fire breaks out, flame A
The temperature fuse 10 melts and is cut off at a temperature of 500 mL, the compression spring 19 expands, the fire damper 9 descends, and the gap between the opening 2 and the lid 4 is closed as shown in FIG. be done.

Next, the embodiments shown in FIGS. 6, 7, and 8 will be described. A tension spring 20 wound around the outer circumference of the rod 15 is installed between the upper flange portion 16 and the enlarged portion 18, and biases the fire damper 9 downward so that the fire damper 9 descends. be. A connecting body 22 attached to the frame 5 and a connecting body 23 attached to the upper flange 16 are connected by a temperature fuse 10. In this embodiment, ventilation is carried out in the same manner as in the embodiments shown in FIGS. 1 and 2. If a fire breaks out now, the flame A and temperature will cause a temperature fuse of 10.
is melted and cut, the tension spring 20 contracts, the fire damper 9 descends, and the opening 2 and ceiling 1
The gap between the two is closed.

[Effects of the Invention] As described above, the present invention provides an outer frame along the opening in the ceiling, places a lid body of a size obtained by closing the opening below the opening, and closes the upper part of the outer frame. A female thread is provided on the frame installed between them, and the male thread of the support shaft protruding above the lid is screwed into the female thread to allow the lid to move up and down, so the lid can be rotated and the support shaft The lid can be moved up and down by screwing the male threaded part onto the female threaded part, and the opening can be closed by the lid by moving the lid up so that it touches the lower surface of the ceiling. It can be closed off to prevent ventilation when ventilation is not needed, and by moving the lid up and down, the gap between the ceiling and the lid can be changed, allowing the amount of ventilation to be changed freely. In addition, a cylindrical fire damper that can close the gap between the opening and the lid is placed inside the outer frame, and the fire damper can be removed using a temperature fuse that melts in the event of a fire and releases support for the fire damper. Since it is supported by the frame, the temperature fuse in the event of a fire melts and falls away from the outer frame, closing the gap between the opening and the ceiling, making it possible to prevent fires without ventilation. Even if it is possible to stop the ventilation and adjust the amount of ventilation, it is also fireproof, and even if a fire damper is installed, it does not become bulky and can be made compact.

[Brief explanation of the drawing]

1A and 1B are a sectional view and a plan view of one embodiment of the present invention, FIG. 2 is a sectional view of the same fire damper in an activated state, and FIG. 3 is a sectional view of another embodiment of the same, FIG. 4 is a cross-sectional view of the same fire damper in operation; FIG. 5 is an enlarged cross-sectional view of the main parts of the above; FIG.
Figure 7 is a sectional view of the above fire damper in an activated state, Figure 8 is an enlarged sectional view of the main parts of the above, Figure 9 is a schematic sectional view of the conventional example, and Figure 10 shows the ventilation status of the house. 1 is a ceiling, 2 is an opening, 3 is an outer frame, 4 is a lid, 5 is a frame, 6 is a female threaded part, 7 is a support shaft, 8 is a male threaded part, 9 is a fire damper, 10 is the temperature fuse.

Claims (1)

[Scope of Claims] 1. An outer frame is provided along the opening in the ceiling, a lid body large enough to close the opening is placed with the opening downward, and a female threaded portion is attached to the frame installed between the outer frames. At the same time, the male threaded part of the support shaft protruding upward from the lid body is screwed into the female threaded part so that the lid body can move up and down, and a cylinder is provided within the outer frame that can close the gap between the opening and the lid body. A ceiling ventilation opening with a fire damper, characterized in that the fire damper is supported on an outer frame by a temperature fuse that melts in the event of a fire and releases the support of the fire damper. 2. The ceiling ventilation opening with a fire damper according to claim 1, wherein the fire damper falls under its own weight when the temperature fuse is cut by melting. 3. Claim 1, characterized in that the fire damper is made to fall by the spring force of a compression spring when the temperature fuse is cut by melting.
Ceiling vents with fire dampers as described in section. 4. A ceiling ventilation opening with a fireproof damper according to claim 1, wherein the fireproof damper is caused to fall by the spring force of a tension spring when the temperature fuse is cut by melting.