JP3385255B2 - Damper control device for closing exhaust duct - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling a damper for closing an exhaust duct provided in a fire extinguishing section provided with a gas fire extinguishing system. Recently, an inert gas fire extinguishing system using an inert gas such as argon or nitrogen which is highly safe for humans as a fire extinguishing agent gas has been proposed and put into practical use. Have been. A fire extinguisher compartment equipped with this type of gas-based fire extinguishing equipment generally has a sealed structure so that the extinguishing agent gas released does not flow out of the fire extinguisher compartment, and an exhaust gas provided in the fire extinguisher compartment. The duct is provided with a closing damper. [0004] Since the closing damper is closed when the fire extinguishing agent gas is released, the pressure in the fire extinguishing target compartment is significantly increased due to the extinguished extinguishing gas, and the fire extinguishing target compartment is opened. There is a risk of damaging buildings and other structures. Conventionally, in order to cope with this problem, separately from a damper for closing an exhaust duct, a pressure relief damper for discharging air in a fire extinguishing target section corresponding to the amount of extinguishing agent gas released is provided. It is located in the fire extinguishing area. However, in existing buildings and the like, there is a problem that it is difficult to install the pressure relief damper due to restrictions on the installation position of the pressure relief damper. The exhaust duct closing damper control device according to the present invention controls the closing damper so as to also have the function of a pressure relief damper, thereby eliminating the need for a pressure relief damper. In addition to avoiding the difficulty of installing a pressure relief damper, this control device can be installed near the closing damper irrespective of the location of the gas storage container, making the entire device compact and requiring extra piping. Less and cheaper. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view showing the entire apparatus, and FIG. 2 is a vertical sectional side view showing the operation valve of FIG. In the drawing, reference numeral 1 denotes a pipe extending from a gas storage container (not shown) of a fire extinguishing system, 2 denotes an injection head arranged in a fire extinguishing section 3 by a pipe 1, and 4 denotes an exhaust gas provided in the fire extinguishing section 3. A duct 5 is a closing damper (piston damper) provided in the exhaust duct 4, 6 is a high-pressure container that can be filled with a fire extinguishing agent gas, 7 is an operating valve provided at the mouth of the high-pressure container 6, 8 is an operating valve 7 A filling port which communicates with the inside of the container through the inlet side 9a of the valve passage 9 at all times, and is connected to the pipe 1 by a branch pipe 10. 11 is a filter provided on the pipe 1 side of the branch pipe 10, 12 is a check valve provided on the filling port 8 side of the branch pipe 10, and 13 is a valve body for opening and closing the valve hole 9b of the valve passage 9 of the operating valve 7. , Are pressed in the closing direction by the control pressure from the control gas port 14. 15 is a filter 11 of the branch pipe 10
A connection pipe 16 connects the space between the control valve 12 and the control gas port 14, and a connection pipe 16 connects the outlet side 9 c of the valve passage 9 of the operating valve 7 to the piston of the closing damper 5. Now, when a fire occurs in the fire extinguishing target section 3,
The fire extinguishing equipment is operated, and the extinguishing agent gas is released from the injection head 2. At this time, since the closing damper 5 is open, in the fire extinguishing target section 3, air is discharged from the exhaust duct 4 together with the release of the fire extinguishing agent gas, and the concentration of the fire extinguishing agent gas in the fire extinguishing target section 3 becomes a predetermined value. It is possible to prevent the pressure in the fire extinguishing target section 3 from rising due to the release of the fire extinguishing agent gas. On the other hand, simultaneously with the release of the fire extinguishing agent gas,
The fire extinguishing agent gas in the inside passes through a filter 11 and a check valve 12 through a branch pipe 10 and is filled into a high-pressure vessel 6 through a filling port 8. That is, in this high-pressure vessel 6, the control pressure (equivalent to the filling pressure) is applied to the valve body 13 from the control gas port 14 through the connection pipe 15, and the valve hole 9b is closed. Will be filled. When the pressure in the pipe 1 becomes lower than a certain pressure, the control pressure of the control gas port 14 communicating with the pipe 1 through the branch pipe 10 and the connecting pipe 15 becomes lower than the predetermined pressure. 13, the valve hole 9b is opened, and the filling pressure activates the piston of the closing damper 5 from the outlet side 9c through the connecting pipe 16, whereby the closing damper 5 is closed. The constant pressure is set, for example, as follows. That is, the ratio between the control pressure of the operation valve 7 and the filling pressure is set to "1:
When the control pressure becomes 1/6 of the charging pressure, the valve hole 9b is opened and the closing damper 5 is closed. The control device for the closing damper 5 configured as described above can be installed near the closing damper 5 irrespective of the installation position (place) of the gas storage container of the fire extinguishing equipment. The whole device becomes compact, and as a result, extra piping and the like are shortened and reduced, resulting in low cost.
When the operating valve 7 configured as described above is used, the setting of the constant pressure is easy and reliable, and the reliability is improved. As described above, according to the present invention, since the closing damper is controlled so as to have the function of the relief pressure damper, the relief pressure damper is provided. And the control device can be installed near the closing damper irrespective of the location of the gas storage container, making the whole device compact and extra. The effect that less piping is required and the cost is reduced can be obtained.

[Brief description of the drawings] FIG. 1 is a schematic diagram showing a first embodiment of the present invention. FIG. 2 is a vertical sectional side view showing the operation valve of FIG. 1; [Explanation of symbols] 1 Piping 2 Injection head 3 Fire extinguishing target compartment 4 Exhaust duct 5 Damper for closing 6 High pressure vessel 7 Working valve 8 Filling port 9 Valve passage 9a Entrance side 9b Valve hole 9c Exit side 10 Branch pipe 11 Filter 12 Check valve 13 Valve 14 Control gas port 15 Connecting pipe 16 Connection pipe

Claims (1)

(57) [Claims 1] A closing damper is opened when gas is released from a gas fire extinguishing system, and a part of the released gas is temporarily filled in a high-pressure container when the gas is extinguished. An exhaust duct for closing the damper for closing by operating a piston of a closing damper (piston damper) with the gas charged in the high-pressure container when the pressure in the pipe falls below a certain pressure; Closing damper control device.