JPH08303162A - Fire shutter - Google Patents

Abstract

PURPOSE: To reduce the cost of an air damper by operating the damper through a wire following a panel when the suspended panel falls and properly resisting the falling of the panel by a sliding member in a cylindrical member. CONSTITUTION: When the temperature fuse of a locking release means 10 blows at the time of a fire, a locking member 8 releases the locking of a winder 7 through a wire 14, and a panel 4 falls by its own weight. A wire 5 discharged from the winder 7 is moved upwards in, a guide frame 1b. The sliding member 21 of an air damper 20 is slid upwards in a cylinder 22 with the movement of the wire 5. A lower chamber parted by the member 21 in the cylinder 22 is decompressed gradually while an upper chamber is pressured gradually, and the compression is increased at the final stage of the lowering of the panel 4, thus lowering the panel 4 comparatively quickly first, then slowly closing an opening section lastly. Accordingly, a structure remarkably simpler than of prior art centrifugal dampers can be formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof shutter, and more particularly to a fireproof shutter that automatically closes when a fire occurs.

[0002]

2. Description of the Related Art Conventionally, in the event of a fire, a predetermined number of panels suspended by wires during normal times are automatically released from the suspended state and dropped by their own weight, thereby opening a shutter. Fireproof shutters are installed at appropriate places indoors to close and prevent fire spread and smoke spread as much as possible. With such a fireproof shutter, if there is no resistance to the panel that falls due to its own weight, the panel will drop at once and it is dangerous.Therefore, a centrifugal brake is interposed in the wire winder. is there.

In this centrifugal brake, a braking member, which rotates in conjunction with a wire pulled by a descending panel, receives a centrifugal force and abuts against an inner peripheral wall of a fixing member having a cylindrical cross section, which causes friction to operate the brake. It is a thing.

[0004]

However, the centrifugal force does not cause the brakes to be overly effective or ineffective against various types of fireproof shutters in which the number of panels used and the total weight differ depending on the installation location and various specifications. Obtaining the brake requires a complicated and precise mechanism, which has been a factor of increasing the cost of the fireproof shutter.

The present invention has been made in view of the above points, and an object of the present invention is to provide a fireproof shutter which is advantageous in cost.

[0006]

In a fireproof shutter according to the present invention, a wire connected to a panel member is wound by a winder and the winder is locked to close the panel member from an opening area to be closed. In order to close the opening area by the panel member when a fire occurs by suspending it above and releasing the lock by the lock releasing means that has reacted to a temperature exceeding the allowable range to drop the panel member. In addition to the conventional fireproof shutter, an air damper is attached as a means for achieving the above object.

The panel members are formed of a refractory material such as a steel plate, and the number of panel members to be used is set according to the size of the opening area.

Further, the closing of the opening region by the panel member is made airtight.

[0009] Generally, the winder has a clutch function in which the lock member automatically locks the rotation in the unwinding direction when winding the wire, but it locks the suspended state of the panel member through the wire. There is no particular limitation as long as it can be maintained.

[0010] Specific examples of the unlocking means for unlocking the winder in response to a temperature exceeding the allowable range include means using a temperature fuse that melts at a high temperature. And the like may be used.

The air damper of the present invention has a sliding member integrally fixed to a part of a wire, a cylindrical member for slidably accommodating the sliding member, and a small hole for passing the wire. And at least one needle valve implanted on the peripheral wall of the cylindrical member, wherein the sliding member keeps the inside of the cylindrical member airtight. It slides.

Here, the cylindrical member is fixed to a frame or the like on the main body side of the fireproof shutter, and the length of the cylindrical member in the longitudinal direction (axial direction) is the length of the wire unwound from the winder by lowering the panel member. It is set to be slightly longer than

The needle valve comprises a main body for defining a path through which air can flow between the inside and the outside of the cylindrical member, and an adjusting member capable of engaging with the main body to narrow the path. is there.

Further, that the sliding member slides inside the cylindrical member while maintaining airtightness means that when the sliding member slides inside the cylindrical member, the sliding member is divided into two chambers by the sliding member. It means that air does not flow from one chamber to the other inside. For such sliding, the sliding member may have a seal ring around it.

[0015]

In the present invention, the air damper is set so that the sliding member fixed to the wire is near the end of the cylindrical member near the winder in the normal state when the panel member is in a suspended state. . When a fire occurs and the lock of the winder is released, the panel member begins to descend due to its own weight, and in conjunction with this, the wire is unwound from the winder. Along with the movement of the wire, the sliding member slides inside the cylindrical member to a side far from the winder while maintaining airtightness. During this sliding, of the two chambers divided by the sliding member inside the cylindrical member, the chamber on the winding machine side is gradually decompressed,
The other chamber is gradually compressed by the sliding member, and the compression of air in the cylindrical member acts as a moderate resistance to the descending panel member. The degree of this compression can be adjusted by a needle valve.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic front view partially showing a fireproof shutter I according to the present invention in an open state, in which an opening area O to be closed in an emergency is hatched for convenience. FIG. 2 is a schematic side view along AA of FIG.
Further, the fireproof shutter I in the closed state is shown in FIG. 3, and the BB side surface of the figure is shown in FIG.

The fireproof shutter I is provided with guide frames 1a and 1b on both left and right sides.
A panel accommodating space 3 for accommodating the panel 4 is set in an area about 1/3 of the upper part between b and the space 3
Is covered by a space wall 3 '. In addition, the lower ends of the guide frames 1a and 1b are connected by a bottom frame 2 that defines a completely lowered position of the panel 4.

Referring to FIG. 2, in panel housing space 3, three panels 4a, 4b, 4c formed of steel plates having a thickness of 1.5 mm or more are arranged so as to overlap front and rear (right and left in FIG. 2). It is housed. In this state, the rear panel 4c is connected to the wire 5 and directly suspended,
The front panel 4a and the center panel 4b are supported by a forwardly extending bottom 4c 'on the rear panel 4c. On the other hand, the wire 5 is wound by a winder 7 installed near the lower end of the right guide frame 1b (shown in perspective) via two pulleys 6a and 6b.

The lower end of the rear surface of the space wall 3 ', the front panel 4a, the upper and lower ends of the central panel 4b, and the rear panel 4c.
Is provided with a bent portion 4 'bent into a U-shape in cross section to engage with an adjacent panel when closed. That is, in the fireproof shutter I, when the rear panel 4c descends and comes into contact with the bottom frame 2 (see FIG. 4), the bent portions 4'between the panels and between the front panel 4a and the space wall 3'are engaged. It is designed so that the panels that are airtight as a result of being combined with each other and that are vertically displaced close to each other in conformity with the area of the opening region O.
The winding machine 7 is a known one in which the rotation in the unwinding direction is always automatically locked by the lock member 8 which receives the bias of the spring (not shown) when winding the wire 5.

The fireproof shutter I is provided with an unlocking means 10 for unlocking the winder 7 in response to a temperature exceeding a predetermined range. This unlocking means 10
As shown in FIG. 5, a rotating member that rotates about a shaft member 13 ′ between a thermal fuse 11 having a cutting portion 11 ′ that melts and cuts at a high temperature and a spring 12 that biases in the contracting direction. It is balanced by interposing 13. Rotating member 1
A wire 14 that is a separate system from the wire 5 that is connected to the panel 4c is connected to 3, and the other end of the wire 14 is directly or indirectly connected to the lock member 8 of the winder 7. The thermal fuse 11 is set so as to enter the opening region O.

Further, the fireproof shutter I is provided with an air damper 20 extending over substantially the entire area of the right guide frame 1b. As shown in a simplified form in FIG. 6, this air damper 20 is a cylindrical sliding member 21 integrally attached to a part of the wire 5 that comes near the winder 7 when the panel is suspended, and this member. A cylinder 22 having an inner diameter corresponding to the diameter of 21 and serving as a cylindrical member fixedly mounted on the frame 1b, and a lid 23 having a small hole 23 'serving as a lid for the upper and lower open ends of the cylinder 22 and through which the wire 5 is passed
And a needle valve 24 implanted on the peripheral wall above the cylinder 22.

The sliding member 21 comprises two rubber O-rings 2.
1'is provided on the outer circumference and slides with the inner circumferential surface of the cylinder 22 while maintaining a seal, that is, airtightness.

The length of the cylinder 22 in the longitudinal direction (axial direction) is slightly longer than the length of the wire 5 delivered from the winder 7 when the panel 4 is dropped.

Further, the needle valve 24 is a cylinder 22.
The main body 24a defines a path 24 'through which air can flow between the inside and the outside of the body, and an adjusting member 24b capable of narrowing the path 24' by being screwed into and out of the main body 24a.

In the normal state in which the panel 4 is suspended, the sliding member 21 is positioned near the end of the cylinder 22 on the winder 7 side, as shown in FIG.

Fireproof shutter I constructed as described above
When using, the panel 4 is normally suspended by the wire 5 to open the opening region O.

Next, the operation of the fireproof shutter I when a fire occurs will be described.

First, the cut portion 11 'of the thermal fuse 11 in the unlocking means 10 is melted by the temperature atmosphere exceeding the allowable range, and the thermal fuse 11 is interrupted. As a result, as shown by the broken line in FIG. 5, the rotating member 13 is released from the balanced state and is pulled by the contracting spring 12, whereby the shaft member 1 is released.
The wire 14 rotates about 3 'and follows the rotation.
The lock member 8 releases the locked state of the winder 7 via. Therefore, the panel 4 is guided by the guide frame 1 by its own weight.
Start to fall along a, 1b.

The wire 5 discharged from the winder 7 when the panel 4 is dropped moves upward in the guide frame 1b. With this movement, the sliding member 21 of the air damper 20 slides upward in the cylinder 22.

At the time of this sliding, the two chambers 25 separated by the sliding member 21 inside the cylinder 22.
Among a and 25b (see FIG. 6), the lower chamber 25a is gradually decompressed, and the upper chamber 25b is pressurized by the sliding member 21 being gradually compressed. This compression is strongest near the final stage of the descent movement of the panel 4, so that the panel 4 initially descends relatively quickly, but at the end slowly closes the open area O (see graph in FIG. 7). In a conventional fireproof shutter using a centrifugal brake, the descent speed of the panel is substantially constant as shown by a broken line in FIG.

Further, by changing the degree of screwing of the adjusting member 24b with respect to the main body 24a of the needle valve 24 and finely adjusting the degree of opening of the path 24 ', the speed at which the sliding member 21, that is, the panel 4 moves, and the change in speed can be changed. It can be as desired as possible.

The needle valve may be installed below the cylinder 22.

[0034]

As described above, in the fireproof shutter according to the present invention, when the suspended panel member falls, the air damper operates via the wire that follows the panel member, and the lid member uses the air damper. The sliding member can give an appropriate resistance to the lowering of the panel member while the internal pressure changes in the sliding member in the cylindrical member approaching the sealed state.

Further, the air damper according to the present invention has a simpler construction than the centrifugal damper and can significantly reduce the cost, and the resistance, that is, the degree of braking can be easily adjusted to a desired value by adjusting the needle valve, so that the specifications are different. It can be applied to any fireproof shutter.

[Brief description of drawings]

FIG. 1 is a partially transparent front view schematically showing a fire protection shutter according to the present invention in an open state.

FIG. 2 is a side view taken along the line AA of FIG.

FIG. 3 is a partially transparent front view schematically showing the fireproof shutter in a closed state.

FIG. 4 is a side view taken along the line BB of FIG.

FIG. 5 is an explanatory diagram of unlocking means.

FIG. 6 is an explanatory cross-sectional view of an air damper.

FIG. 7 is a graph showing changes in the drop velocity of the panel.

[Explanation of symbols]

 I Fire protection damper O Open area 4, 4a, 4b, 4c Panel 5 Wire 7 Winder 8 Lock member 10 Lock release means 11 Thermal fuse 20 Air damper 21 Sliding member 21 'O-ring 22 Cylinder 23 Lid 24 Needle valve 24a Main body 24b adjusting member 24 'path 25a, 25b chamber

Claims (1)

[Claims] 1. A wire connected to a panel member is wound by a winder and the winder is locked to suspend the panel member above an opening area to be closed, which exceeds an allowable range. An air damper attached to the wire in a fireproof shutter in which the opening area is closed by a panel member when a fire occurs by unlocking the lock member that has reacted with temperature to lower the panel member. The air damper has a sliding member integrally fixed to a part of the wire, a cylindrical member slidably housing the sliding member, and a small hole for passing the wire. A lid member serving as a lid at both open ends of the cylindrical member, and at least one needle valve provided on a peripheral wall of the cylindrical member, wherein the sliding member is a cylindrical member; A fireproof shutter characterized by sliding inside the material while maintaining airtightness.