JP2002303373A - Passage selector apparatus for fire extinguishing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a passage selector apparatus for a fire extinguishing system, in which leakage from a seal portion is prevented by synergetic effect of a seal body on a closing face of a movable closing member and pressure applied on the seal body, rotations of the movable closing member is facilitated to prevent damage or abrasion of the seal body at a time of rotating because the pressure is not applied for the seal body at a time of moving the movable closing member. SOLUTION: The passage selector apparatus comprises: a casing 8 having three openings 8a-8c respectively communicating to the upstream and downstream of a primary pipe connected with a fire extinguisher storage container and a secondary pipe connected with a section to be extinguished; the movable closing member 9 which reciprocates over the three openings 8a-8c in a non-pressure state to close a side of one of the openings while the movable closing member 9 is play-fitted in the casing 8 by a rotational supporting shaft 11 with a clearance in an all arc direction, and of which section is in an approximately partially semicircular shape; and the seal body 10 formed by coating applied on the closing face 9a of the movable closing member 9. When the pressure is applied on the primary pipe, the movable closing member 9 is pressed by the pressure to a closing direction by the clearance to move to a closing position, and the movable closing member 9 keeps airtightness at the closing position by the seal body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an apparatus for switching a flow path to a plurality of secondary pipes connected to a fire extinguishing section, wherein a primary pipe provided from a fire extinguishing agent storage container is always in a non-pressure state. The present invention relates to the flow path switching device of a fire extinguishing system in which one or a plurality of primary pipings are arranged in series.

[0002]

2. Description of the Related Art A conventional fire extinguishing system of this type will be described with reference to an inert gas fire extinguishing system shown in FIG. FIG. 3 is a schematic diagram showing the entire fire extinguishing system.

In the drawing, 1 is a fire extinguisher storage container storing an inert gas, 2 is a container valve mounted on the fire extinguisher storage container 1, 3 is a connecting pipe, 4 is a collecting pipe (primary pipe), 5 is a collecting pipe. A plurality (four in the drawing, A to D) arranged in series in 4
, A plurality of flow switching devices (6 in the drawing, A to E)
The fire extinguishing section 7 has a plurality of nozzles (not shown) connecting the nozzle (not shown) of the fire extinguishing section 6 and the flow path switching device 5 (in the drawing, 5).
Main pipe (secondary pipe). The flow switching device 5 is always in a position where the upstream side and the downstream side of the collecting pipe (primary pipe) 4 communicate with each other.
Is closed at a position where the upstream side of the collecting pipe 4 and the main pipe (secondary pipe) 7 communicating with the fire extinguishing section 6 communicate with each other.

At this time, the piping of the fire extinguishing system is in a non-pressure state. When a fire is sensed in the fire extinguishing target section 6 (A), the flow path switching device 5 (A) is first activated and switched by the activation gas released by the activation signal, and then the container valve 2 is opened. The inert gas released under reduced pressure into the collecting pipe 4 is radiated from the flow path switching device 5 (A) to the fire extinguishing target section 6 (A) through the main pipe 7 to extinguish the fire.

Alternatively, when a fire is detected in the fire extinguishing target section 6 (B), the starting gas released by the starting signal causes
First, the channel switching device 5 (B) is activated and switched,
Next, the container valve 2 is opened. The inert gas released under reduced pressure into the collecting pipe 4 passes through the flow path switching device 5 (A) and enters the downstream side of the collecting pipe 4.
The fire is radiated from (B) through the main pipe 7 to the fire extinguishing target section 6 (B) and extinguishes the fire.

[0006]

Since the flow path switching device 5 in such a fire extinguishing system is of a three-port flow path switching type usually called a three-way valve, a ball valve is usually used. However, when the inert gas is released, the pressure applied to the ball valve is high (10 Mpa), so that the seal portion leaks, the pressure of the released gas decreases, and the inert gas is released to unnecessary portions. There is a problem that the rotation of the ball is not smooth because the ball is pressed against the valve seat to prevent the leakage.

[0007]

SUMMARY OF THE INVENTION A flow switching device for a fire extinguishing system according to the present invention has been made in order to solve such a problem, and has a sealing member on a closing surface of a movable closing member and a pressure for pressing the sealing member. The leakage of the seal portion is suppressed by the synergistic effect of the above, and no pressure is applied during the movement of the movable closing member. Therefore, the rotation of the movable closing member is facilitated, and the seal body is prevented from being damaged or worn during the rotation.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS.
FIG. 2 will be described. 1 is a longitudinal side view, and FIG. 2 is FIG.
FIG. 2 is a cross-sectional view taken along the line II of FIG. 2, and the entire system will be described using the same reference numerals as those of the above-described conventional inert gas fire extinguishing system.

In the drawing, reference numeral 8 denotes a housing having three ports 8a, 8b, 8c for connecting the upstream and downstream sides of the collecting pipe (primary pipe) 4 and the main pipe (secondary pipe) 7, respectively. 8
A movable closing member which is reciprocatingly moved over the mouths 8a, 8b, 8c and closes one mouth side thereof, and has a substantially partial moon-shaped cross section;
Reference numeral 10 denotes a sealing body formed by coating a closing surface 9a of the movable closing member 9 with a material capable of withstanding pressure, such as plastic or rubber, 11 denotes a rotating support shaft of the movable closing member 9, 1
Reference numeral 2 denotes a shaft locking hole that holds one end of the rotation support shaft 11 with a clearance 13, and 14 denotes a driving member that rotates the other end of the rotation support shaft 11 with the clearance 13.
Although not shown, it is rotated by an actuator.

In the state shown in the figure, since the pipe portion is in a non-pressure state, the movable closing member 9 is in a state with some play in the housing 8 without being pressed against the inner surface of the housing 8 by the clearance 13. Therefore, in this loosely fitted state, when the rotation of the movable closing member 9 is switched by driving the rotation supporting shaft 11 by the actuator, the sealing body 10
Can be easily rotated without being caught in the mouth 8c or strongly rubbing the inner surface of the housing 8 during this movement.

Next, in the state shown in the drawing, when an inert gas enters the port 8a from the upstream side of the collecting pipe (primary pipe) 4, the pressure of the inert gas is applied to the back surface of the movable closing member 9. Due to the pressure, the movable closing member 9 causes the clearance 13
The sealing body 10 is pressed against the inner surface of the separation housing 8 to maintain the airtightness of the sealing body 10.

As described above, when the movable closing member 9 is formed to have a substantially partial cross section in the cross section, the movable closing member 9 can be processed by conventional processing without special processing, thereby being easy and inexpensive.
Further, since the sealing body 10 can be applied to the entire closing surface 9a of the movable closing member 9 by coating, the entire surface of the closing surface 9a becomes a sealing surface, and unlike the partial seals such as the packing and the O-ring, a large and stable seal. The effect is obtained.

[0013]

As described above, according to the present invention, the leakage of the seal portion is suppressed by the synergistic effect of the sealing body on the closing surface of the movable closing member and the pressure for pressing the sealing body, and the movable closing member is moved. At this time, no pressure is applied, so that the rotation of the movable closing member is facilitated and the effect of preventing the seal body from being damaged or worn during the rotation can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II in FIG.

FIG. 3 is a schematic diagram showing the entire conventional fire extinguishing system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire extinguisher storage container 2 Container valve 4 Primary piping 6 Fire extinguishing section 7 Secondary piping 8 Housing 8a Housing opening 8b Housing opening 8c Housing opening 9 Movable closing member 9a Closing surface 10 Seal body 11 Rotation support Shaft 12 Shaft locking hole 13 Clearance 14 Drive member

Continued on front page F-term (reference) 2E189 BA03 BA07 BB06 BB08 BD06 MA05 MA07 MB03 3H053 AA02 AA22 BA04 BA22 3H067 AA12 AA23 CC02 CC23 DD03 DD12 EA01 FF17

Claims (1)

[Claims] A primary pipe lined from a fire extinguishing agent storage container is always in a non-pressure state, and one or more flow path switching devices for a plurality of secondary pipe lines leading to a fire extinguishing target section are provided in the primary pipe line. In the flow switching device of a fire extinguishing system in which a plurality of fire extinguishing systems are arranged in series, a housing having three ports communicating with the upstream and downstream of the primary pipe and the secondary pipe, respectively, A movable closing member having a substantially partial cross-section that reciprocates in the non-pressure state over the three ports and closes one side thereof while being loosely fitted with a clearance in a circumferential direction by a rotation support shaft; A sealing body formed by applying a coating to a closing surface, and the movable closing member is pushed in a closing direction by the clearance by a pressure applied to the primary pipe, and the sealing body is closed at the closed position. Flow channel switching device of the extinguishing system, characterized in that so as to retain more air-tightness.