JP3368290B2 - Smoke exhaust door in natural smoke exhaust system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a smoke exhaust door in a natural smoke exhaust system.

[0002]

2. Description of the Related Art As a smoke exhaust system of a building, there is a natural smoke exhaust system utilizing the buoyancy of smoke. That is, after the fire, the smoke collected on the upper part of the building is to be released to the outside by opening the smoke exhaust door installed on the upper part. This smoke exhaust door is simply opened and controlled upon detection of a fire.

[0003]

Conventionally, the smoke door in the above-mentioned natural smoke exhaust system is said to be opened immediately after the occurrence of a fire, so that the inside of the building is under a negative pressure compared to the outside. Even if there was, it was opened, and smoke was not discharged due to the inflow of outside air, but on the contrary, it caused a dangerous situation in which it diffused backflow into the building and disturbed the smoke layer. That is, when the outside air is strong or the temperature inside the building is lower than the temperature outside the building (such as during summer cooling).
For example, the pressure difference inside and outside the building is negative (positive pressure in the direction from the inside to the outside of the building) until the smoke is sufficiently accumulated after the fire.
In a room with a high ceiling (dome, large-scale atrium, etc.), the smoke layer temperature that accumulates at the upper part of the room at the time of a fire does not become so high that buoyancy is small, which is particularly remarkable.

As described above, conventionally, since the negative pressure condition is not dealt with, the pressure difference determination device is deficient even when manually controlled, and it is very difficult to open the smoke exhaust door. The present invention has been made in view of the above problems of the prior art, and an object thereof is to open a smoke exhaust door in a natural smoke exhaust system in a positive pressure state without fail. In addition, it is possible to predict the state of the exhaust flow at the time of opening.

[0005]

In order to achieve the above object, a smoke exhaust door in a natural smoke exhaust system according to the present invention has a through hole formed in the door surface, and the through hole has a directivity. The anemometer is installed, and the open control is performed in conjunction or manually based on the positive pressure and negative pressure judgment from the differential pressure measurement by the anemometer.

Alternatively, the shape of the through small hole is adapted to the shape of the door opening when the smoke exhaust door is opened, and the through small hole is provided with a cover adapted to the smoke exhaust door in the open position. .

[0007]

[Function] Since the differential pressure between the inside and outside of the smoke exhaust door is calculated from the flow velocity measured by the directional anemometer installed in the small through hole formed in the door surface to a very small value from the known Osophis equation, If it is opened only when pressure is applied, backflow can be completely blocked. Furthermore, if the through small hole provided in the smoke exhaust door and the cover attached thereto are made to resemble the smoke exhaust door opening and the smoke exhaust door when opened, respectively,
Since the flow of the airflow at the time of opening can be reproduced with a reduced model in this part, the state at the time of opening the smoke exhaust door can be predicted in advance, which can be used as a reference for control correspondence.

[0008]

EXAMPLES Examples will be described with reference to the drawings. Figure 1
In the above, the smoke exhaust door 1 in the natural smoke exhaust system is provided in the opening 3 formed in the upper part of the building 2, and is controlled to be opened by interlocking or manually via an attached smoke exhaust door opening mechanism 4. A small through hole 5 is formed in the smoke exhaust door 1, and a directional anemometer 6 detailed in FIG. 2 is installed therein.

Velocity Vm / sec measured by the anemometer 6
Therefore, the differential pressure ΔP can be detected up to a minute differential pressure by the following Osophis equation.

[0010]

[Equation 1]

However, based on the detection of the buoyancy of smoke, the temperature difference between the inside and outside, and the pressure difference ΔP exhibited according to the outside temperature, the negative pressure is not opened, but only the positive pressure is opened. If so, it is possible to completely prevent backflow, and to achieve perfect smoke emission. This procedure is shown in the flow chart of FIG. As shown in FIG. 2, the through-hole 5 is similar to the front opening 3 and a cover 7 similar to the smoke exhaust door 1 in the open position.
When attached, this part is made into a reduced model of the smoke exhaust door 1, and the property when the smoke exhaust door 1 is open can be predicted with the smoke exhaust door 1 closed.

[0012]

Since the present invention is configured as described above, it has the following effects. (1) Natural smoke can be inexpensively performed without backflow, which is preferable for emergency evacuation. (2) Smoke emission can be performed even under a slight differential pressure, and rapid smoke emission can be expected. (3) According to the second aspect, it is preferable that the state after the smoke exhaust door is opened can be predicted and predicted.

[Brief description of drawings]

FIG. 1 is a sectional view of a smoke exhaust door of the present invention.

FIG. 2 is an enlarged detailed view of an encircled line A portion in FIG.

FIG. 3 is a flow chart of a control procedure of the smoke exhaust door of the present invention.

[Explanation of symbols]

1 smoke door 2 buildings 3 openings 4 Smoke door opening mechanism 5 small holes 6 Anemometer 7 cover

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) A62C 2/00 A62B 13/00

Claims (2)

(57) [Claims] 1. A through small hole is bored in a door surface, and a directional anemometer is installed in this through small hole, and interlocking or interlocking is performed based on positive pressure and negative pressure judgment from differential pressure measurement by the anemometer. A smoke exhaust door in the natural smoke exhaust system, which is characterized by being controlled to open manually. 2. The shape of the through small hole according to claim 1,
A smoke exhaust door in a natural smoke exhaust system characterized in that it is fitted to the shape of the smoke exhaust door when the smoke exhaust door is opened, and a cover is attached to the through hole to match the smoke exhaust door in the open position.