JPS5925401Y2 - Smoke exhaust opening/closing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device that uses pressurized air or pressurized nonflammable gas to open and close a smoke exhaust vent provided in the ceiling of a building in the event of a fire.

Most of the commonly used smoke exhaust opening/closing devices of this type are electric type, and an electric lock is installed on the side of the smoke exhaust opening, and the latch is normally locked to the lid of the sister smoke opening. However, in the event of a fire, the electric lock device is unlatched using an emergency power supply, and the lid is allowed to droop under its own weight, opening the smoke exhaust port.

With this method, in the event of a fire, if the wiring connecting the electric lock device and the emergency power supply breaks down or is short-circuited, it will no longer work, and restoration after normal inspection tests must be done manually.

In view of the above points, the present invention uses a pneumatic cylinder to open and close the lid of the smoke exhaust port.In particular, the lid is opened by its own weight and spring pressure as the pressure gas is discharged, and if the piping is damaged. Even if pressure gas leaks, it will not affect the opening operation in any way.

The above-mentioned pressure gas is discharged by excitation of a solenoid switching valve installed at a location far from the smoke exhaust port to prevent the effects of wiring breakage due to fire, and in case of an emergency, manual switching valve operation is required. This ensures safety and prevents malfunctions due to power outages, etc.

Furthermore, since the opening and closing are performed by the above-mentioned pneumatic cylinder, the return operation after an inspection test is extremely easy.

The structure and operation of the present invention will be described below with reference to embodiments.

In Fig. 1, reference numeral 1 denotes the lid of the smoke exhaust port, which can be freely rotated from a horizontal position to a vertical position around a hinge 1a at the lower edge of the smoke exhaust port, so as to open and close the smoke exhaust port. When the lid 1 is placed in a horizontal position, it is on the same plane as the ceiling and does not spoil the aesthetic appearance.

The smoke exhaust port 2 is attached to the ceiling material 3 as shown in the figure, and is connected to a smoke exhaust duct)-23.

Reference numeral 4 denotes a pneumatic cylinder, whose head side end is rotatably supported by a metal fitting 5a fixed to the smoke exhaust port 2, and whose piston rod end is rotatably supported by a metal fitting 5a fixed to the back surface of the lid 1.
It is rotatably supported on b.

A return spring 4a is provided in the head-side cylinder chamber of this cylinder, and the rod-side cylinder chamber is communicated with a pressure gas source through a flexible tube 6.

Therefore, when pressurized gas (for example, pressurized air or non-flammable pressurized nitrogen gas) is supplied into the tube 6, the piston rod compresses the return spring 4a and retreats, causing the lid 1 to move into the first position.
Move and hold in the horizontal position shown.

When the pressure gas in the tube 6 is released, the return spring 4
The piston begins to move forward due to the force a, and the lid 1 begins to rotate downward.

At this time, the weight of the lid 1 is added to increase the rotational force, and the lid 1 rapidly hangs down to the vertical position shown by the chain line in FIG. 1 and stops.

A wire 8 is attached to the head side end position 4b of the gas pressure cylinder 4, and the other end of the wire is connected to an operation confirmation switch 7 mounted on the inner surface of the smoke exhaust port 2.

This relationship is clearly shown in the enlarged view of FIG.

That is, the wire 8 is fixed to the switch push rod 10,
When the pneumatic cylinder 4 rotates clockwise about the pivot point 9a, the switch push rod 10 is pulled up against the return spring 11, and the limit switch 12 is actuated by the stepped portion 10a of the switch push rod 10. has been done.

Conversely, when the pneumatic cylinder 4 rotates counterclockwise, the switch push rod 10 descends and the limit switch 12 becomes inactive.

FIG. 3 shows a circuit diagram of an embodiment of the present invention, and the overall control mechanism and its operation will be explained using this diagram.

The tube 6 from the pneumatic cylinder 4 is connected to the conduit 6a via a manual switching valve 13 provided adjacent to the conduit 6a.
A is connected to a pressure gas source 15 via a dual solenoid type electromagnetic switching valve 14 installed at a safe location away from the smoke exhaust port.

Solenoids 14a and 14b of this electromagnetic switching valve 14 and the operation confirmation switch 7 are connected to a control panel 16.

The control panel 16 receives a signal from the smoke/heat sensor 9 manual switch, etc., and opens the aforementioned smoke exhaust port cover 1, and at the same time, the operation confirmation switch 7 is activated and the operation confirmation light 17 in the control panel is turned on. It is also configured to drive a smoke evacuation machine.

18 is a relay for interlocking the smoke evacuation device (not shown), 19 is its contact, 20 is a terminal for connecting the smoke evacuation device, 21 is a manual switch, 22 is a terminal for connecting a smoke detector, and 23 is a reset switch. be.

From terminal 22 for connecting smoke detector or manual switch 2
When a signal is input from 1, the solenoid 14b is energized and the electromagnetic switching valve 14 is switched from the position shown in the figure, releasing the pressurized gas in the cylinder chamber to the atmosphere via the pipe 6a, and the smoke exhaust port 2 is opened as described above. It will be released.

At the same time, the operation confirmation switch 7 is activated, the operation confirmation light 17 is lit, and the relay 18 for interlocking the smoke evacuation device is energized, and the contact 19 of the relay for interlocking the smoke evacuation device is activated, and the terminal 20 for connecting the smoke evacuation device is activated. A driving current is sent to the smoke evacuation machine.

If it is necessary to manually open the smoke exhaust port due to a malfunction of a smoke detector or other reasons, the manual switching valve 13 provided near the smoke exhaust port may be switched to remove the pressure gas from the cylinder. It operates in the same way.

Next, we will explain the return operation after opening the smoke exhaust port for a device inspection test such as a fire prevention exercise.

By pressing the return switch 23 on the control panel 16, the solenoid 14a is energized and the electromagnetic switching valve 14 returns to its original state (
3), the cylinder is supplied with air and the lid 1 of the smoke exhaust port 2 returns to the horizontal position on the ceiling surface.

At the same time, the operation confirmation switch 7 is turned off and the operation confirmation light 17 is turned off.

In addition, the relay 18 for interlocking the smoke evacuation machine is demagnetized, the contact 19 of the blade relay for interlocking the smoke evacuation machine is cut off, and the terminal 20 for connecting the smoke evacuation machine
The electrical current is cut off and the smoke extractor stops.

Of course, when the manual switching valve 13 is switched to open the smoke exhaust port 2, the switching valve 13 can be returned to its original state.

By using the present invention having the above structure and function, since no electromagnetic switching valve is placed near the smoke exhaust opening/closing device, it is possible to prevent accidents such as the wires being cut and the smoke exhaust opening not opening in the event of a fire.
Furthermore, since the smoke evacuation system is activated when the electromagnetic switching valve is energized, unnecessary malfunctions do not occur due to power outages or underground continuity accidents.

If the cylinder piping is damaged and pressure gas is discharged,
There is a fail-safe effect in that the smoke exhaust port is always open.

In the event of an electrical system failure such as a solenoid switching valve, emergency operation can be performed using the manual switching valve.

A pneumatic cylinder with a return spring is used to hang the smoke exhaust port lid, so operation is reliable and there are fewer failures.

Further, it has the advantage that recovery after an inspection test can be performed extremely easily by simply pressing a recovery switch on the control panel.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a schematic diagram showing the installed state of the device, FIG. 2 is an enlarged explanatory diagram of the operation confirmation switch portion, and FIG. 3 is an overall circuit diagram. 1...Lid, 2...Smoke exhaust port, 2a...
...Smoke exhaust duct, 4...Pneumatic cylinder, 6
...Tube, 7...Confirmation switch,
13... Manual switching valve, 14... Bent electromagnetic switching valve,
15... Pressure gas source, 16... Control panel, 17...10. Confirmation light, 21...Manual switch, 23...Return switch.

Claims (1)

[Scope of utility model registration request] A lid that rotates around the lower edge of the smoke exhaust port and can be opened and closed freely, a movable end pivoted on the back side of the lid, the other end pivoted on a fixed part, and attached to one cylinder chamber in the direction in which the lid is opened. Compressed non-flammable gas is constantly supplied to a gas pressure cylinder into which a biased spring is inserted and the other cylinder chamber of this cylinder.It is installed at a location away from the smoke exhaust port, and in the event of a fire, it is equipped with a smoke/heat detector and a manual switch. A smoke exhaust opening/closing device comprising: an electromagnetic switching valve that discharges the compressed nonflammable gas in response to an electric signal from a smoke exhaust port; and a manual switching valve that is disposed near the smoke exhaust vent and manually discharges the compressed nonflammable gas.