JPH0330748Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an airtight exhaust damper that opens its opening and closing blades to open the intake opening and exhaust smoke when a fire occurs. It concerns smoke dampers.

Conventionally, as shown in FIG. 1, each chamber 3a, 3b,
3c (hereinafter referred to as intake opening) 4
2 and 3 as smoke exhaust dampers 5... which are installed in... and open and close these intake openings 4...
The structure shown in the figure is known.

Reference numerals 6 and 6 in the figure indicate opening/closing blades (single blade type), and these opening/closing blades 6 are rotatably supported on a pivot shaft 7, and are supported by two biasing members (not shown) in the positive direction (arrowed in the figure). (A direction) and the opposite direction (arrow B direction). The above-mentioned biasing members are assembled so that either one of them works, and normally the opening/closing blade 6 is biased in the forward direction, but in the event of a fire, the locking of the biasing member is switched and the biasing member is biased in the opposite direction. The opening/closing blade 6 is configured to be opened.

In addition, the opening/closing vanes 6 are secured to the inner peripheral surface of the opening/closing vanes 6 on the side of the intake opening 4, and the gap between the inner peripheral surface of the smoke exhaust duct 2 and the opening/closing vanes 6 is reduced to ensure an airtight seal. A wing contact member 8 is attached to improve the performance. As shown in FIG. 3, the wing contact member 8 is formed in a frame shape along the entire inner peripheral surface of the intake opening 4.

In the smoke exhaust damper 5 having the above configuration, if a fire occurs in the chamber 3b shown in FIG. 1, for example,
The exhaust fan 1 is driven by a signal from a smoke detector etc. installed in the chamber 3b, and the locking of the biasing member of the opening/closing blade 6 is switched in the smoke exhaust damper 5 of the chamber 3b only, so that these opening/closing operations are performed. The blade 6 rotates in the direction of arrow B in FIG. 2 to open the intake opening 4.
At this time, the smoke exhaust dampers 5 of the other rooms 3a, 3c... do not operate, and the intake openings 4... of those rooms 3a, 3c... are in a closed state, so the room 3b where the fire occurred
The smoke filling inside can be rapidly exhausted by the exhaust fan 1.

By the way, the above-mentioned conventional smoke exhaust damper has the following drawbacks, and a solution to these problems is desired.

In other words, from the viewpoint of manufacturing cost and manufacturing technology (accuracy), it is necessary to improve the degree of surface finishing of the mutual contact surfaces of the opening/closing blade 6 and the blade contact member 8 to the extent that airtightness can be obtained. It is difficult to reduce the erroneous displacement of the opening/closing blades due to rotation to the extent that the performance can be maintained. Therefore, even when the opening/closing blade 6 is in the closed position, there is some gap between the opening/closing blade 6 and the wing contact member 8. Therefore, exhaust fan 1
When the smoke exhaust damper 5 is activated and exhaust begins, a small amount of air will be taken in (leak air) from the non-operating smoke exhaust damper 5. If the number of smoke exhaust dampers 5 relative to the exhaust fan 1 is small, this is not so much of a problem, but when there are many smoke exhaust dampers 5, such as in a building with many rooms, the total amount of leakage air is so large that it cannot be ignored. This results in a significant decrease in exhaust efficiency.

In addition, when the diameter of the smoke exhaust duct must be reduced due to constraints such as building space, the total exhaust volume also decreases as the diameter decreases, so the exhaust pressure must be increased to prevent the decrease. There is. However, as the exhaust pressure increases, the smoke exhaust damper 5
The amount of leakage air from the pump also increases, further reducing the exhaust efficiency.

This idea was made in view of the above circumstances,
The purpose is to provide a smoke exhaust damper with improved airtightness during non-operation without increasing manufacturing costs. is attached to cover the gap created between the opening/closing blade and the blade contact member.

This invention will be explained below with reference to the drawings. FIGS. 4 and 5 show an example of this invention, and parts common to those in FIGS. 2 and 3 are given the same reference numerals to simplify the explanation. Number 1 in the figure
0 indicates a closing sheet member. This occlusion sheet member 10 is made of stainless steel 0.1~
It is composed of a relatively inexpensive, highly heat resistant, and flexible sheet-like member with a thickness of 0.05 mm, and this wing contact member 8 and It is attached so as to cover one end of the gap between it and the opening/closing blade 6, that is, the inner peripheral side. As shown in the figure, the sheet member 10 may be formed by cutting a single sheet member into a frame shape, and may be provided continuously along the entire periphery of the wing contact member 8, or, for example, Four rectangular sheet members are formed to cover each side of the periphery of the wing contact member 8, and the ends of these four sheet members are overlapped to cover the entire periphery of the wing contact member 8. It may also be provided along the If the occluding sheet member 10 is composed of a plurality of sheet-like members and the ends of each sheet-like member are overlapped with each other as in the latter case, this occluding sheet member 10 will be This is preferable because when the sheet-like members are sucked into the gap, the respective constituent sheet-like members are displaced from each other and come into closer contact with the gap.

According to the smoke exhaust damper with the above structure, when a fire occurs in a certain place (room), the exhaust fan is started and the smoke is exhausted from that place, and the suction force is applied to the smoke exhaust dampers in the remaining rooms. Even if leakage starts from the gap between the opening/closing blade and the blade contact member of these smoke exhaust dampers, the flexible closing sheet member 10 is immediately sucked into the gap and closes the gap, preventing the leakage. can be prevented and the exhaust efficiency can be increased.

In addition, in the above embodiment, the case where this invention is applied to a smoke exhaust damper with a single-winged opening/closing blade structure is shown, but this invention can also be applied to a smoke exhaust damper with other structures such as a double-blade center-hung type opening/closing blade. The same can be applied to

As explained above, the airtight smoke exhaust damper according to this invention has a sealing sheet member with high heat resistance and flexibility attached along the entire periphery of the wing contact member to form a gap between the opening/closing blade and the wing contact member. Since it is designed to cover the duct, it does not increase manufacturing costs, and when negative pressure is generated in the smoke exhaust duct when the duct is not in operation, the negative pressure causes the closing sheet to come into contact with the opening/closing blade. It is attracted to one end of the gap between the opening and closing blades and the wing contact member, and due to its flexibility, it is evenly crimped onto the opening/closing blade and the wing contact member, thereby ensuring airtightness between the opening/closing blade and the wing contact member. It has excellent effects such as being able to maintain the temperature. Improves airtightness.

[Brief explanation of drawings]

Figure 1 is a configuration diagram showing an example of a non-smoke flow path by a smoke exhaust duct, Figures 2 and 3 show conventional smoke exhaust dampers, Figure 2 is a plan cross-sectional view, and Figure 3 is a front view. 4 and 5 show an embodiment of this invention, with FIG. 4 being a plan sectional view and FIG. 5 being a front view. 2...Smoke exhaust duct, 4...Intake opening, 6...
Opening/closing blade, 8... Wing contact member, 10... Closing sheet member.

Claims (1)

[Scope of utility model registration request] An opening/closing vane for opening and closing the intake opening of the smoke exhaust duct is provided so as to be biased and rotatable in both forward and reverse directions, and the opening/closing vane is placed outside the intake opening along the entire inner peripheral surface of the intake opening. In a smoke exhaust damper that is provided with a wing contact member that stops movement in the direction,
An airtight exhaust, characterized in that a heat-resistant flexible closing sheet is attached to the entire periphery of the wing contact member on the intake opening side to cover the gap between the wing contact member and the opening/closing blade from one end side. smoke damper.