JPH028223B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a smoke evacuation device with a fire prevention function.

[Conventional technology]

Traditionally, smoke exhaust vents were installed at the entrance of smoke exhaust ducts to exhaust smoke generated during a fire to the outside without filling the building, and smoke exhaust dampers were installed in the middle of the smoke exhaust ducts. is publicly known. Generally, this type of smoke evacuation device normally closes partition plates such as smoke evacuation vents and damper blades, and when a fire occurs, switches a solenoid valve or operates a manual valve based on smoke detection or heat (temperature) detection. The partition plate is opened and the generated smoke is discharged to the outside to protect people from suffocation due to smoke.

[Problem to be solved by the invention]

However, because conventional smoke exhaust systems are configured to leave the partition plate open in the event of a fire, there is a problem in that the smoke exhaust duct acts as a chimney, increasing the number of fires. There is a problem in that the heat and fire resistance of smoke ducts is limited, and the ducts act as fire propagation paths and encourage the spread of fire.
Additionally, the smoke evacuation device may be exposed to high temperatures and malfunction may occur.

The present invention has been made in view of the above circumstances, and is capable of opening a partition plate in the event of a fire to perform a smoke evacuation function, and automatically reliably closing the partition plate again in a situation where the fire has progressed. The technical challenge is to provide a smoke evacuation device that exhibits fire prevention functions.

[Means to solve the problem]

The technical means for solving the above technical problem is a partition plate provided at any position of the smoke exhaust duct;
A first spring acting on the first piston to open the partition plate is provided in a first cylinder portion into which a first piston having a first piston rod connected to the partition plate is fitted so as to move forward and backward; 1
A second cylinder chamber is provided with a first cylinder chamber into which compressed air acting on the first piston is supplied and discharged against a spring, and a second piston having the first cylinder portion as a second piston rod is fitted in the second piston so as to be freely retractable. A second spring that acts on the second piston to actuate the first piston rod and close the partition plate is provided in the cylinder portion, and a compression force that acts on the second piston against the second spring. a cylinder device including a second cylinder chamber through which air is supplied and discharged; a switching valve connected to the first cylinder chamber; and a temperature of a smoke exhaust duct connected to the second cylinder chamber set in advance. It consists of a temperature-sensitive switching valve that switches when the temperature rises above a temperature-sensitive switching valve; and an air source connected to the switching valve and the temperature-sensitive switching valve. Supplying compressed air to the first cylinder chamber and the second cylinder chamber and closing the partition plate,
When a fire occurs, the switching valve is switched to communicate the first cylinder chamber to the atmosphere and the first spring opens the partition plate, and when the fire progresses and the temperature-sensitive switching valve is activated, the second cylinder chamber is communicated to the atmosphere. and closing the partition plate with a second spring.

[Effect]

According to the above technical means, under normal conditions, compressed air is supplied from the air source to the first cylinder chamber and the second cylinder chamber through the switching valve and the temperature-sensitive switching valve, and compressed air is supplied to the first cylinder chamber and the second cylinder chamber to resist the first spring and the second spring. to close the partition plate. In the event of a fire, the switching valve is opened to exhaust smoke, only the first cylinder chamber is communicated with the atmosphere, the compressed air in the first cylinder chamber is released into the atmosphere, and the partition plate is opened by the spring force of the first spring. When the fire progresses further and the temperature-sensitive switching valve is activated, the temperature-sensitive switching valve switches to connect the second cylinder chamber to the atmosphere and release the compressed air in the second cylinder chamber to the atmosphere, causing the spring of the second spring to Force closes the partition again. Further, by using the first cylinder portion as the second piston rod, a single cylinder device can perform the smoke exhaust function of opening the partition plate and the fire prevention function of closing the partition plate.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be explained based on an illustrated embodiment in which the present invention is applied to a smoke exhaust damper.

Fig. 1a shows an outline of a smoke exhaust duct, 1 is a smoke exhaust duct, and a flange 2 is attached to the middle part of the duct 1.
A damper frame 3 is provided through the damper frame 3, and the frame 3 is provided with a driving rotation shaft 4 and a driven rotation shaft 4'.
Damper blades 5, 5' are fixed to both rotating shafts 4, 4' as partition plates, protrusions 6, 6' are provided on these damper blades 5, 5', and connecting members 7 are connected to pins 8, 8'. This allows the damper blades 5, 5' to be interlocked by being attached to the protrusions 6, 6'. The damper frame 3 is provided with a mounting plate 10, one end of the drive rotation shaft 4 projects from the mounting plate 10, and a damper lever 11 is fixed to the projecting portion. Reference numeral 12 denotes a support member to which a cylinder device 20, which will be described later, is attached.The support member 12 is rotatably attached to the mounting plate 10 by a pin 13, and the tip of the first piston rod 35 of the cylinder device 20 is attached to the pin 15. It is connected to the damper lever 11 by.

Here, the cylinder device 20 will be explained based on FIG. 4. Main body 21 having an inner hole 21a
A front cover 22 is attached to the front end of the main body 21, and a rear cover 23 is attached to the rear end of the main body 21. Further, a second piston 24 having an intermediate hole 24a is fitted into the inner hole 21a of the main body 21 so as to be able to move forward and backward. A piston rod 25 is provided. Said second
A second spring 26 that presses the second piston 24 forward (leftward in the figure) is inserted between the piston 24 and the rear lid 23, and the second spring 26 is inserted against the second spring 26.
A second cylinder chamber 27 through which compressed air acting on the piston 24 is supplied and discharged is formed between the second piston 24 and the front lid 22, and a supply and discharge hole 28 communicating with the second cylinder chamber 27 is formed in the front. A hole is provided in the lid 22. Thus, the second cylinder portion 29 is configured.

Furthermore, the inner hole 25 of the second piston rod 5
A first piston 34 is fitted into the first piston 34 so that it can move forward and backward, and a first piston rod 35 is provided on the first piston 34. The first piston rod 35 passes through the front wall 32 and projects to the outside, and its tip end is connected to the damper lever 11 as described above. Said first
A first spring 36 is inserted between the piston 34 and the front wall 32 to press the first piston 34 rearward (rightward in the figure), and a throttle plug 40 is provided at the tip in the center of the rear lid 23. The distal end thereof is connected to the second piston 24.
A supply/discharge pipe 38 that can be penetrated is provided protrudingly into the inner hole 24a of the
A first cylinder chamber 37 is connected between the first piston 34 and the supply/discharge pipe 38 and is connected to the supply/discharge pipe 38 and receives and discharges compressed air that acts on the first piston 34 against the first spring 36. to form. Thus, the first cylinder portion 39 is configured.

Note that 38a is a stopper provided at the tip of the supply/discharge pipe 38, and restricts the amount of rearward movement of the second piston 24. Also, 30 is a spring guide,
31 is a retaining ring.

The UT port of the electromagnetic directional switching valve 50 is connected to the supply/discharge pipe 38 in the cylinder device 20 having the above configuration, and the IN port of the switching valve 50 is connected to the manual switching valve 5.
1 OUT port of the manual switching valve 51.
The IN port is connected to an air source 52. In the normal state, the electromagnetic directional switching valve 50 is in the A position, the manual switching valve 51 is in the E position, and the first
Compressed air is supplied to the cylinder chamber 37, the electromagnetic directional switching valve 50 is switched to the B position by a smoke detection signal from a smoke detector (not shown), and the manual switching valve 51 is switched to the B position by a lever 51a. Switch to F position by operating . Incidentally, both the switching valves 50, 5
1 is not limited to what is illustrated.

The supply/discharge hole 28 of the cylinder device 20 is connected to an OUT port of a temperature-sensitive switching valve 60, which will be described later, and an IN port of the temperature-sensitive switching valve 60 is connected to the air source 52.

Here, the temperature-sensitive switching valve 60 will be explained based on FIG. 8. 61 is a main body having an inner hole 62; 63 is a piston slidably fitted into the inner hole 62;
4 is a lid attached to one end of the main body 61, and 65 is a stopper. Reference numeral 66 denotes a tube provided at the other end of the main body 61 so as to communicate with the inner hole 62, and an attachment 69 to which a lid 67 is bonded with a temperature fuse 68 such as solder is screwed into the tube 66. 70 is an IN port provided on the main body 61, 7
1 is an OUT port, 72 is a discharge hole, and 73
is an annular groove provided on the outer periphery of the central portion of the piston 63, and in the state shown in the figure, the IN port 70 communicates with the OUT port 71 via the annular groove 73.
74 is a throttle hole that communicates between the valve chamber 75 provided in the piston 63 and the annular groove 73, and 76 is a throttle hole that communicates the valve chamber 77 provided in the piston 63 with the annular groove 7.
This is a throttle hole that communicates with 3. The temperature-sensitive switching valve 60 having such a configuration is attached to the damper frame 3 and the mounting plate 10 by its threaded portion 78 such that the attachment 69 is located within the smoke exhaust duct 1. The normal state of the temperature-sensitive switching valve 60 is shown in FIG. 1b using graphical symbols. When the temperature in the smoke exhaust duct 1 rises and the temperature fuse 68 melts, the switching valve 60 is activated, that is, the compressed air in the valve chamber 75 flows out through the tube body 66 and is caused by the throttle holes 74 and 76. In order to create a pressure difference between the valve chamber 75 and the valve chamber 77, the piston 63 moves in the direction of arrow H. This switched state is shown graphically in FIG. 3b. The temperature fuse 68 is determined in consideration of the fire resistance and heat resistance of the smoke exhaust duct 1.

Next, the operation of the smoke exhaust damper having the above structure will be explained.

First, in normal times (no fire), Figure 1a,
As shown in Fig. b, the electromagnetic directional switching valve 50 is at the A position, the manual switching valve 51 is at the E position, and the temperature-sensitive switching valve 60 is at the C position. While retracting the two-piston rod 25, the compressed air is transferred to the first cylinder chamber 3.
7 to advance the first piston rod 35 (see FIG. 5), and close the damper vanes 5, 5' as shown in FIG. 1a.

When a fire occurs (when a fire occurs), the electromagnetic directional switching valve 50 is switched to the B position based on the smoke detection signal, or the manual switching valve 51 is switched to the F position by operating the lever 51a, and the damper blades 5,
5' open (Figure 2a). That is, when the electromagnetic directional switching valve 50 is switched to the B position or the manual switching valve 51 is switched to the F position, the compressed air in the first cylinder chamber 37 is discharged and the first piston 34 is released, the first piston rod 35 is moved forward by the first spring 3.
The damper blade 5 retreats due to the backward pressing force of 6.
5' is opened. Therefore, smoke exhaust duct 1
The smoke exhaust function is achieved by opening the door. At this time, compressed air continues to be supplied to the second cylinder chamber 27 via the temperature-sensitive switching valve 60, and the second piston 24 maintains its normal state.

If the fire progresses further and the temperature inside the smoke exhaust duct 1 rises above a predetermined set value and the temperature fuse 68 of the temperature-sensitive switching valve 60 melts, the temperature-sensitive switching valve 60
is switched to the D position as shown in FIG. 3b, and the damper vanes 5, 5' are closed again. (Fig. 3a) That is, when the temperature-sensitive switching valve 60 is switched to the D position, the compressed air in the second cylinder chamber 27 is discharged and presses the second piston 24 in the rearward direction, as shown in Fig. 7. In order to release the force, the second piston rod 25
moves forward due to the forward pressing force of the second spring 26, and at the same time the first piston rod 35 moves forward to close the damper vanes 5, 5' again. The smoke exhaust duct 1 is then closed again and exhibits its fire prevention function.

In other words, the smoke exhaust damper as explained above normally closes the smoke exhaust duct, and when a fire occurs, it opens the smoke exhaust duct based on smoke detection to perform the smoke exhaust function, and if the fire progresses further, the smoke exhaust duct closes. When the internal temperature rises, the smoke exhaust duct is closed again based on temperature detection, providing a fire prevention function.

In the embodiments of the present invention, this smoke exhaust device was applied to a smoke exhaust damper, but in the event of a fire, the smoke exhaust device of the present invention opens the normally closed smoke exhaust vent and turns the temperature-sensitive switching valve on. Needless to say, the present invention can be applied to a smoke exhaust port configured to close again upon activation (temperature detection).

〔Effect of the invention〕

As is clear from the above description, the smoke evacuation device of the present invention has both the smoke evacuation function and the fire prevention function, and according to the smoke evacuation device, when a fire occurs, the first The switching valve connected to the cylinder chamber operates to open the partition plate and perform the smoke exhaust function, and when the fire progresses, the temperature-sensitive switching valve connected to the second cylinder chamber of the cylinder device automatically operates. The partition plate can be closed to provide fire protection function.
This has the advantage of preventing the spread of fire through the smoke exhaust duct after people have safely evacuated. Moreover, in this smoke evacuation device, the cylinder device is controlled by the air pressure supplied from the air source and operated by the first and second springs, so the opening and closing operation of the partition plate is reliable in an emergency. moreover,
This smoke exhaust system has a single cylinder device that performs the smoke exhaust function of opening the partition plate and the fire prevention function of re-closing the partition plate, making installation in the smoke exhaust duct very easy and maintenance management possible. It also has the advantage of being easy to use.

[Brief explanation of drawings]

Fig. 1a is an explanatory diagram showing an embodiment of the smoke evacuation device according to the present invention, Fig. 1b is an explanatory diagram showing an outline of the temperature-sensitive switching valve in Fig. 1a, and Fig. 2a is an explanatory diagram showing the same embodiment. Fig. 2b is an explanatory drawing showing the outline of the temperature-sensitive switching valve in Fig. 2a, Fig. 3a is an explanatory drawing showing the fire prevention function of the same embodiment, Fig. 3b is an explanatory diagram schematically showing the temperature-sensitive switching valve in FIG. 3a,
FIG. 4 is a sectional view of the cylinder device in the same embodiment, FIGS. 5 to 7 are explanatory views of the operation of the cylinder device, and FIG. 8 is a sectional view of the temperature-sensitive switching valve in the same embodiment. DESCRIPTION OF SYMBOLS 1... Smoke exhaust duct, 5, 5'... Damper blade (partition plate), 20... Cylinder device, 24... Second piston, 25... Second piston rod, 26... Second spring, 27... Second cylinder chamber, 29... Second cylinder part, 34...first piston, 35...first piston rod, 36...first spring, 37...first cylinder chamber,
39...first cylinder part, 50...electromagnetic directional control valve,
51...Manual switching valve, 52...Air source, 60...Temperature-sensitive switching valve.

Claims (1)

[Claims] 1. A partition plate installed at any position in the smoke exhaust duct;
A first spring acting on the first piston to open the partition plate is provided in a first cylinder portion into which a first piston having a first piston rod connected to the partition plate is fitted so as to move forward and backward; 1
A second cylinder chamber is provided with a first cylinder chamber into which compressed air acting on the first piston is supplied and discharged against a spring, and a second piston having the first cylinder portion as a second piston rod is fitted in the second piston so as to be freely retractable. A second spring that acts on the second piston to actuate the first piston rod and close the partition plate is provided in the cylinder portion, and a compression force that acts on the second piston against the second spring. a cylinder device including a second cylinder chamber through which air is supplied and discharged; a switching valve connected to the first cylinder chamber; and a temperature of a smoke exhaust duct connected to the second cylinder chamber set in advance. a temperature-sensitive switching valve that switches when the temperature rises above a temperature-sensitive switching valve; and an air source connected to the switching valve and the temperature-sensitive switching valve; Supplying compressed air to the first cylinder chamber and the second cylinder chamber and closing the partition plate,
When a fire occurs, the switching valve is switched to communicate the first cylinder chamber to the atmosphere and the first spring opens the partition plate, and when the fire progresses and the temperature-sensitive switching valve is activated, the second cylinder chamber is communicated to the atmosphere. A smoke evacuation device characterized in that the partition plate is closed by a second spring.