JPH11125456A - Double-duty pressure-releasing dumper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide fire-proofing and pressure releasing functions to one dumper. SOLUTION: When a temperature fuse 28 is fused due to fire while blades is fully open, a driving device 21 is turned off, releasing locking of a driving shaft 22, and opening/closing blades 2 and 3 are turned in the closing direction by means of a counter weight 18 and they are brought into contact with stoppers 14 and 15 vertically, thereby blocking a distribution route 1a. In this case, the driving shaft 22 is turned in accordance with the rotation of a rotary shaft 4. When the indoor pressure increases due to emission of extinguishing gas, the blades 2 and 3 are turned to be opened against the moment of the counter weight 18 by means of the gas pressure, so that the indoor pressure is released. While the blades 2 and 3 are turned for pressure releasing, the rotary force of rotary shaft 4 to the driving shaft 22 is stopped by the idle clearance of a floating joint 23, so that the blades are turned securely and smoothly for opening without resistance of the driving device 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper having both a fire prevention (smoke prevention) function and a pressure-reducing function.

[0002]

2. Description of the Related Art As a damper for opening and closing an air flow passage,
Fire (smoke) dampers and pressure relief dampers are known.

The fire prevention damper is provided with an opening and closing blade which can be freely opened and closed in a casing in which a flow passage is formed. When a signal is output from a fire or smoke detection sensor, the opening and closing blade which has been open is closed by closing the fire. To prevent the spread of fire and the outflow of smoke,
It is provided in a general ventilation opening.

When the indoor pressure rises above a predetermined pressure due to the release of a high-pressure fire extinguishing gas or the like, the relief pressure damper opens and closes an opening / closing blade provided in a flow passage of a casing by a pressure difference between the inside and outside of the room to open the room. The pressure is reduced, and is provided at the pressure relief port.

[0005]

In a semiconductor integrated circuit manufacturing plant or the like, a large amount of purified air is always sent into a room and discharged from a ventilating port, thereby preventing obstacles due to dust and the like generated in the room. ing. The conventional fire prevention damper and pressure relief damper have only a single function as described above. Therefore, in order to take fire prevention and fire extinguishing (pressure reduction) measures in the above-described clean room, computer room, communication machine room, and the like. In this method, a pressure relief port must be provided in addition to the ventilation port, and a fire prevention damper and a pressure relief damper must be provided in these ports, so that the equipment cost is high and maintenance and inspection are troublesome.

An object of the present invention is to provide a dual-purpose pressure-reducing damper capable of reducing equipment costs. It is another object of the present invention to provide a dual-purpose pressure relief damper that can be easily maintained and inspected. It is another object of the present invention to provide a dual-purpose pressure relief damper having a simple structure and high operation reliability.

[0007]

In order to achieve at least one of the above-mentioned objects, the present invention is directed to a casing having a flow passage formed therein and a casing having a rotary shaft supported by a bearing of the casing. An opening / closing blade that is provided in the flow passage so as to be openable and closable and abuts a closing stopper to close the flow passage; a biasing means provided to bias the opening / closing blade in a closing direction; A driving device for rotating the drive shaft to the open position in the on state to hold the open / close blade in the open state, and for freely rotating the drive shaft by the rotation shaft in the off state. And a configuration including:

In the above means, when the drive device is turned on, the drive shaft rotates to the open position to hold the open / close blade in the open state. Therefore, the air in the room flows freely through the flow passage to the outside of the room. In the state of the opening and closing blade, when the driving device is turned off to freely rotate the drive shaft, the opening and closing blade rotates in the closing direction together with the drive shaft by the urging force of the urging means, and contacts the closing stopper. Close the flow passage. In this state, the flow passage is blocked by the opening and closing blades,
In the case of fire, combustion gas and smoke are prevented from leaking out of the room.

As described above, when the indoor pressure increases due to the release of the fire-extinguishing gas into the closed chamber, the opening and closing blades open and rotate due to the pressure difference between the indoor and the outdoor to open the flow passage and lower the indoor pressure. For this reason, destruction of the chamber due to gas pressure is prevented. When the open / close blade is opened and rotated, the floating joint makes the rotary shaft of the open / close blade move freely, and does not transmit the rotational force to the drive shaft. It will open smoothly.

In the above-mentioned dual-purpose pressure relief damper, the floating joint is formed by forming an insertion tooth protruding in one of a drive shaft and a rotation shaft in the axial direction thereof and a floating gap between the insertion tooth. The drive shaft and the rotary shaft may be provided with a pair of engagement teeth provided on the other of the drive shaft and the rotary shaft so as to protrude in the axial direction thereof. In this case, the structure of the floating joint is simplified, and failure is unlikely to occur. Further, the floating angle of the floating joint can be set to approximately 90 degrees (claim 3). In this case, even if the pressure suddenly increases, the pressure can be quickly released. Further, the urging means can be a counterweight (claim 4). Again, the structure is simpler,
Failures are less likely to occur.

[0011]

Embodiments of the present invention will be described with reference to the drawings. 1 to 5 show an embodiment of the present invention, and reference numeral 1 denotes a casing. Casing 1
Is formed in a square cylindrical shape and has a flow passage 1a. A pair of upper and lower opening and closing blades 2 and 3 are supported in bearings 6 and 7 of the casing 1 so as to be openable and closable in a flow passage 1 a of the casing 1. A wind direction plate 9 is fixed horizontally between the two.

Rotating arms 10 and 11 are attached to the rotating shafts 4 and 5, respectively.
(FIG. 2) is mounted, and each pivot arm 10, 11 is connected to each other by a pair of parallel links 12, 12 pinned to them. The rotating arms 10 and 11 and the parallel links 12 and 12 link the rotation of the pair of opening and closing blades 2 and 3 with each other. Each of the opening and closing blades 2 and 3 includes a closing stopper 14 provided on the casing 1 and the wind direction plate 9,
15 in a vertical state to close the flow passage 1a, and rotate horizontally to fully open the flow passage 1a. Rotation is prevented.

A counterweight 18 and a lift adjusting weight 19 are attached to one end of each of the rotating shafts 4 and 5. A drive shaft 22 of a drive device 21 is connected to the other end of the rotating shaft 4 via a floating joint 23, and a limit switch 24 is provided on the other end of the rotating shaft 5.

The counterweight 18 includes the opening / closing blades 2 and 3
Is biased to rotate in the closing direction, and constitutes biasing means. The lift adjusting weight 19 adjusts the lift generated in each of the opening and closing blades 2 and 3 by the flowing air, and the limit switch 24 detects the retraction pressure rotation of the opening and closing blades 2 and 3 and outputs a signal. is there. The counterweight 18 and the lift adjusting weight 19 are covered with a cover 25 together with the parallel link 12 and the like.
And the limit switch 24 are fixed to the outer surface of the casing 1.

Here, the floating joint 23 will be described.
The floating joint 23 is provided at the position of the diameter of the drive shaft 22.
2 and the insertion teeth 22a (FIGS. 4 and 5) protruding in the axial direction, and the rotating shaft 4 are formed with floating gaps g, g of the inserting teeth 22a so as to be symmetric with respect to the center of the rotating shaft 4. It comprises a pair of engaging teeth 4a, 4a protruding in the axial direction. The relative rotation between the rotary shaft 4 and the drive shaft 22 is free by the floating angle of the insertion teeth 22a in the floating gaps g. The floating angle of the floating joint 23 in the figure is 90 degrees.

A balance weight 27 is attached to the upstream end of each of the opening and closing blades 2 and 3, and an inspection port 1b is provided at a lower portion of the casing 1. Reference numeral 28 denotes a thermal fuse, and when the thermal fuse is blown by heat, the driving device 21 is turned off.

Next, the operation of the above-described dual-purpose pressure relief damper according to the present invention will be described. The dual-use pressure relief damper is used by being attached to a pressure relief port that also functions as a ventilation port. FIGS. 1 to 3 and 6 show a state in which the drive shaft 22 is opened and rotated by the drive device 21 which is turned on, and the opening and closing blades 2 and 3 are held in a fully opened state. Ventilation is provided.

When a fire occurs in the above-described ventilation state and the thermal fuse 28 is blown by heat, the drive unit 21 which has fixed the drive shaft 22 at the open position until then is turned off and the drive shaft 22 is fixed. Solve. For this reason, each of the opening and closing blades 2 and 3 rotates in the closing direction by the action of the counterweight 18, and abuts the closing stoppers 14 and 15 in a vertical state to block the flow passage 1a (see FIGS. 7 and 8). . At this time, the drive shaft 22 inserts the insertion teeth 22a into the engagement teeth 4a, 4
Since it is pushed in the circumferential direction by a, it rotates according to the rotation of the rotating shaft 4.

When the opening and closing blades 2 and 3 are closed, the combustion gas and smoke generated by the fire do not flow out of the room through the flow passage 1a, thereby preventing the spread of fire or the like.

When the indoor pressure exceeds a predetermined pressure due to the release of fire-extinguishing gas into the fire chamber, the opening and closing blades 2 and 3 open and rotate clockwise in FIG. 8 against the moment of the counterweight 18 due to the gas pressure. And reduce the indoor pressure. The evacuating operation of the opening and closing blades 2 and 3 prevents the chamber from being destroyed due to gas pressure. The above-described retraction rotation of the opening and closing blades 2 and 3 is detected by the limit switch 24.

When the open / close blades 2 and 3 rotate counterclockwise in FIG. 8, the transmission of the rotational force of the rotary shaft 4 to the drive shaft 22 is cut off by the floating gaps g and g of the floating joint 23. The opening and closing blades 2 and 3 open and rotate accurately and smoothly at the set pressure without receiving the resistance of the driving device 21 side. Opening and closing blades 2, 3
Is possible from the closed state to the fully opened state, and it is possible to cope with a sudden increase in pressure.

When the driving device 21 is turned on after the extinguishing of the fire, the driving shaft 22 rotates clockwise by 90 degrees in FIG. 8 to hold the opening and closing blades 2 and 3 in the fully opened state. The ON command to the drive device 21 is transmitted even when the opening / closing blades 2 and 3 are in a half-open state as shown in FIG. 9 or in a fully-open state as shown in FIG. It can be output regardless of the moving position. In the case of the half-open state in FIG. 9, the drive shaft 22 rotates the rotation shaft 4 after the insertion teeth 22 a touch the engagement teeth 4 a and 4 a of the rotation shaft 4 after loosening. In the case of the fully open state in FIG. 10, the drive shaft 22 simply rotates by 90 degrees to fix the open / close blades 2 and 3 in the fully open position at that position.

Although an electric motor is used for the drive device 21 in the figure, an actuator such as an electromagnet or a cylinder can be used, and the type and specific structure are arbitrary. Therefore, “on” and “off” in this specification do not necessarily mean “energized” and “switch off”. The number of facilities of the opening and closing blades 2 and 3 can be arbitrarily set to one or three or more.

Further, a spring or the like can be used as the urging means 18. A smoke sensor or a temperature sensor may be used in place of the thermal fuse 28 for turning off the driving device 21. The cross-sectional shape of the casing 1 can be, for example, a circle other than a square. The rotation angle of the drive shaft 22 and the floating angle of the floating joint 23 are not limited to 90 degrees, but may be smaller or larger. Although the number of rotation stages of the drive shaft 22 in the figure is one, it can be two or more stages. In this case, the opening degree of the opening and closing blades 2, 3 can be adjusted as necessary. Becomes

[0025]

As described above, the present invention provides a casing having a flow passage formed therein, a rotating shaft supported by a bearing of the casing, and a rotatable shaft provided in the flow passage of the casing. An opening / closing blade that closes the flow passage by contacting the opening / closing blade, an urging means provided to urge the opening / closing blade in the closing direction, and a drive shaft connected to the rotation shaft by a floating joint. A drive device for rotating the drive shaft to an open position to hold the open / close blades in an open state, and a drive device for allowing the drive shaft to rotate freely by the rotary shaft in an off state; And a pressure relief function, so that one air circulation port is provided in a symmetrical chamber,
It is only necessary to equip this with a combined pressure-reducing damper. Therefore, equipment costs can be kept low, and maintenance and inspection are easy. Also, even if it becomes necessary to add pressure relief equipment to a room equipped with ventilation equipment, the ventilation pressure of the ventilation equipment is used as it is and this dual pressure relief damper is attached to it, and a new pressure relief port is installed. Formation can be avoided.

In the above-mentioned dual-purpose relief damper, the floating joint is formed by forming an insertion tooth protruding in one of the drive shaft and the rotation shaft in the axial direction thereof and a floating gap between the insertion tooth. If the drive shaft and the rotation shaft are provided with a pair of engagement teeth protruding in the axial direction on the other of the drive shaft and the rotation shaft, the structure of the floating joint is simplified and the breakdown is less likely to occur, so that the operation reliability is improved. I do. In addition, when the floating angle of the floating joint is set to approximately 90 degrees, the pressure can be reduced by rotating the open / close blades to near the fully open position, thereby improving the pressure reducing function. Also, when the urging means is a counterweight, the structure is simplified and a failure hardly occurs, so that the operation reliability is improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a combined pressure relief damper according to the present invention.

FIG. 2 is a right side view of the combined pressure-reducing damper of FIG. 1 with a cover and a part of a casing broken at the same position.

FIG. 3 is a left side view of the combined pressure-reducing damper of FIG. 1;

FIG. 4 is an external view showing an example of a floating joint.

FIG. 5 is an external view of the floating joint in a separated state.

FIG. 6 is a view of a floating joint holding an opening and closing blade in a fully opened state.

FIG. 7 is a view of the floating joint when the opening and closing blade is rotating open.

FIG. 8 is a view of the floating joint when the open / close blade is in a closed state.

FIG. 9 is a view of a floating joint when the opening / closing vane rotates by a pressure of about 45 degrees.

FIG. 10 is a view of the floating joint when the open / close blade has been rotated to the fully opened state;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Casing 1a Flow path 2, 3 Opening / closing blade 4, 5 Rotating shaft 4a Engaging teeth 6, 7 Bearing 14, 15 Closing stopper 18 Counterweight (biasing means) 21 Drive 22 Drive shaft 22a Insertion picture 23 Floating joint g Idling gap

Claims (4)

[Claims] 1. A casing having a flow passage formed therein, and an opening / closing vane which is rotatably provided in a flow passage of the casing with a rotation shaft supported by a bearing of the casing and which abuts a closing stopper to close the flow passage. A biasing means provided by biasing the open / close blades in the closing direction; and a drive shaft connected to the rotary shaft by a floating joint, wherein the drive shaft is rotated to an open position in an on state to provide the drive shaft. A drive device for holding the open / close blades in an open state and a drive device for freely rotating the drive shaft by the rotation shaft in an off state. 2. The floating joint includes an insertion tooth provided on one of a drive shaft and a rotation shaft so as to protrude in the axial direction thereof.
2. The dual-purpose escapement according to claim 1, further comprising a pair of engaging teeth provided on the other of the drive shaft and the rotary shaft so as to protrude in the axial direction thereof by forming a floating gap between the insertion teeth. Pressure damper. 3. The dual-purpose pressure-reducing damper according to claim 1, wherein the floating angle of the floating joint is substantially 90 degrees. 4. The dual-purpose relief pressure damper according to claim 1, wherein said urging means is a counterweight.