JPH0893346A - Door open obstacle prevention device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an opening obstacle preventing device capable of surely preventing an opening obstacle of a door under a simplified system. [Structure] A damper 2 having an opening / closing mechanism is provided below a door 1 installed in a pressurized smokeproof compartment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening obstacle prevention device for preventing an opening obstacle of a door installed in a portion (pressurized smokeproof compartment) which employs a pressurized smokeproof system.

[0002]

2. Description of the Related Art In a conventional pressurized smoke prevention system, when the system is in operation, even if the door of the part forming the smoke prevention compartment is open, the minimum wind speed for smoke protection should be maintained at that part. Is designed to. On the other hand, when the door is closed, it is necessary to prevent the opening failure due to the excessive differential pressure before and after the door, so set the maximum allowable differential pressure and control the differential pressure so that it is below that value. ing. As described above, in the conventional pressurized smoke prevention system, in order to maintain the pressure, it is necessary to finely control the differential pressure in consideration of the opening / closing state of the door. Specifically, it detects the differential pressure and adjusts the fan for pressurized air supply to control the air volume, or installs a differential pressure damper on the wall facing the outside air to let the supplied air escape to the outside air and control the pressure. I am doing it.

[0003]

However, the pressurized smoke-proof compartment has a large number of doors, and the conditions for setting the opening / closing state of the doors are quite complicated.
Especially when the maximum differential pressure when opening the closed door is a problem, under various conditions, when trying to design the differential pressure to be held between the minimum value and the maximum value as described above, However, the pressure control system becomes quite complicated.

Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to surely prevent a door opening obstacle under a simplified system. To do.

[0005]

In order to achieve the above object, the present invention provides an opening obstacle prevention device for preventing an opening obstacle of a door installed in a pressurized smokeproof compartment, in which the door (1) is provided. A damper (2) having an opening / closing mechanism (A) was provided in the lower part of the. Further, the damper (2) has a plurality of blades (3) rotatably provided at an axial center (B), and the opening / closing mechanism (A) has an axial center (B) of each blade (3). ) Is attached to the upper end of the connecting rod (4) in a swingable manner, and the connecting rod (4) is moved in the vertical direction in conjunction with the swinging movement of the connecting rod (4). And a swing member (5) for rotating the blade (3) about the axis (B). Also, the damper (2)
Is installed on a door whose opening direction is the high pressure direction. The damper (2) is preferably installed on the door (1) between the fire room and the corridor or between the corridor and the staircase.

[0006]

In the present invention, a damper having an opening / closing mechanism is provided below the door installed in the pressurized smoke-proof compartment. In pressurized smoke compartments, open doors due to excessive differential pressure across the door must be prevented if the door is closed. In order to prevent this opening failure, it is necessary to reduce the differential pressure or the resistance at the time of opening due to the differential pressure. Therefore, in the present invention, a mechanism for preventing the opening failure is provided in the door at the site where the opening failure may occur due to excessive pressure. That is, by opening the damper, the pressurized air escapes to reduce the differential pressure, and the opening is formed in the lower portion of the door to reduce the resistance area, and the force required for opening can be reduced. .

On the other hand, in the conventional pressurized smoke prevention system, in order to reduce the differential pressure, the differential pressure before and after the door is detected to control the air volume, so that the system is complicated.
On the other hand, in the present invention, reduction of the differential pressure is performed mechanically by opening / closing the damper, not by electrical control by detecting the differential pressure. As a result, the accuracy of the pressure control system is lower than before, and the system itself is simplified.

The damper has a plurality of blades provided so as to be rotatable about an axis. The opening / closing mechanism has a connecting rod attached to the axial center of each blade, and a swinging member swingably attached to the upper end of the connecting rod. To open the damper, the swinging member may be pushed down. When the oscillating member is pushed down, the connecting rod moves downward in conjunction with this, and each blade rotates about the axis to form an opening. In this way, the damper can be easily opened and closed simply by operating the swing member.

The damper is installed on the door whose opening direction is the high pressure direction. The reason for this is that the door opening obstacle occurs when the door is pushed open in the direction of high pressure (when it is pushed open in the evacuation direction). For example, the damper is installed on the door between the fire room and the corridor or between the corridor and the staircase. In other words, the pressure distribution in the pressurized smoke prevention compartment becomes larger in the order of fire room, corridor, staircase attached room, and staircase. In this case, the space between the fire room and the corridor, or the space between the corridor and the staircase (room with staircase) corresponds to the case where the door is pushed open to the higher pressure side. It is desirable to install a damper on the door.

[0010]

Embodiments of the present invention will be described with reference to the drawings. Figure 1
FIG. 2 is an external view of a door provided with the opening obstacle prevention device of the present invention, and FIG. 2 is a sectional view of the opening obstacle prevention device. A damper 2 having an opening / closing mechanism A is provided below the door 1 installed in the pressurized smokeproof compartment. The damper 2 has a plurality of blades 3 rotatably provided on the axis center B. A connecting rod 4 is attached to each blade 3, and a panic bar 5 is attached to the connecting rod 4. The connecting rod 4 and the panic bar 5 constitute an opening / closing mechanism A. The connecting rod 4 is attached to the axial center B of each blade 3 so as to be movable in the vertical direction (direction of arrow X in FIG. 2). On the other hand, the panic bar 5 is swingably attached (in the direction of the arrow Y in FIG. 2) about the axial center C of the upper end of the connecting rod 4.

To open the damper 2, the panic bar 5 may be pushed down. When the panic bar 5 is pushed down, the connecting rod 4 moves downwards in conjunction with this,
Each blade 3 rotates about the axis B to form the opening D. On the other hand, the panic bar 5 may be pushed up to close the damper 2. When the panic bar 5 is pushed up, the connecting rod 4 moves upward in conjunction with this and the blades 3 or the shaft center B pivot in the opposite direction to close the opening D. In this way, the damper 2 is opened and closed by operating the panic bar 5.

Further, the damper 2 is basically installed on the door 1 whose opening direction is the high pressure direction. This is because the obstacle to open the door 1 occurs when the door is pushed open to the side with higher pressure (when pushed in the evacuation direction). And this damper 2 is between the fire room and the corridor,
Alternatively, it is installed on the door between the corridor and the staircase or staircase annex. This is because the pressure distribution in the pressurized smoke-proof compartment increases in the order of fire room, corridor, staircase annex, and staircase. In the present invention, it is assumed that the doors 1 are pushed open in the evacuation direction, and the damper 2 is provided on these doors 1 to effectively prevent the opening failure.

As described above, by providing the damper 2 having the opening / closing mechanism A, there is no electric part in the drive portion, and the operation is ensured even though the mechanism is simple. In addition, the accuracy of the pressure control system in designing the system for pressurized smoke protection is less than that of conventional systems.

Specifically, regarding the pressure control when designing the pressurized smoke prevention system, in the door 1 having an area of about 2 m ² ,
Generally, when the differential pressure exceeds 10 mmAq, it is generally said that even adults cannot open it, so the maximum differential pressure is 6 to
About 8 mmAq is recommended. However, according to the present invention, it is considered that about 10 to 12 mmAq or more is allowed, so that the pressure control system can be simplified.

Further, it has been confirmed by an experiment that the resistance due to the differential pressure becomes small and the opening of the door 1 becomes easy if a part of the door 1 starts to be opened.
It is considered that the effect of opening the

In the above embodiment, the damper 2 is opened and closed by interlocking the connecting rod 4 with the panic bar 5, but the present invention is not limited to this.
Instead of the above, a lever handle may be used, and the damper 2 may be opened and closed by operating the lever handle. Further, a knob interlocking with the damper 2 may be used, and the damper 2 may be opened and closed by turning the knob.

[0017]

According to the present invention, the opening failure can be prevented more reliably under the differential pressure control with low accuracy and the simplified system.

[Brief description of drawings]

FIG. 1 is an external view of a door provided with an opening obstacle prevention device of the present invention.

FIG. 2 is a cross-sectional view of the opening obstacle prevention device of the present invention.

[Explanation of symbols]

 1 Door 2 Damper 3 Blade 4 Connecting rod 5 Panic bar A Opening / closing mechanism

Claims (4)

[Claims] 1. An opening obstacle prevention device for preventing an opening obstacle of a door installed in a pressurized smoke-proof compartment, wherein a damper having an opening / closing mechanism is provided below the door. Open failure prevention device. 2. The damper has a plurality of blades rotatably provided about an axis thereof, and the opening / closing mechanism is provided with a connecting rod attached to the center of each blade and an upper end of the connecting rod. 2. A swing member that is movably attached and that swings each blade around an axis by moving the connecting rod in the up-down direction in conjunction with the swing operation thereof. Door open obstacle prevention device. 3. The damper is installed on a door whose opening direction is a high pressure direction.
Door opening obstacle prevention device described in. 4. The door opening obstacle preventing device according to claim 3, wherein the damper is installed on a door between the fire room and the corridor or between the corridor and the staircase.