JP2004248751A - Wet type flowing water detector with emergency shutdown function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flowing water detector which can maintain a shut down condition by shutting down the supply of water to a secondary side piping when a valve disc of the flowing water detector happens to open during the non-fire period. <P>SOLUTION: The inside of the flowing water detector 3 is divided into primary and secondary sides I and II by a partition 8 having a communication port 9. A valve disc 10 freely slidable along the inner wall of a valve box is placed on the secondary side II of the communication port 9 and a control chamber 15 formed of the valve disc 10 and the inner wall of the valve box is made to communicate with the primary and secondary sides I and II. A conductively closed electromagnetic valve 21 is provided between the control chamber 15 and the secondary side II and an orifice 20 and a check valve 19 are provided between the primary side I and the control chamber 15 while a flowing water detection means is arranged. Upon the actuation of a sprinkler head 4, the electromagnetic valve 21 is closed when no fire signal is sent from a fire alarm 5 to put the valve disc 10 on a valve seat or when the signal of a pressure switch PS disposed on the secondary side II or the signal from the flowing water detection means are outptted, the electromagnetic valve 21 is kept closed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a flowing water detection device installed in a wet sprinkler facility in which fire extinguishing water is filled in a pipe to which a sprinkler head is connected.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a sprinkler fire extinguishing system including a closed type sprinkler head, a wet sprinkler system in which fire-extinguishing water is filled in a pipe in which the sprinkler head is installed is generally used. In addition, there are dry-type sprinkler equipment that fills the pipe with gas for the purpose of preventing freezing, and pre-actuated sprinkler equipment that sprays fire-extinguishing water when both the sprinkler head and the fire detector operate.
[0003]
Wet sprinkler equipment (hereinafter referred to as "sprinkler equipment") is more economical in terms of cost than the other two. However, if the sprinkler head receives a shock other than during a fire and releases water, the room will be flooded and water damage will occur.
[0004]
Therefore, in the running water detection device installed in the above sprinkler equipment, the one provided with a shut-off means for closing the flow path of the fire extinguishing water to the pipe in which the sprinkler is installed by operating the water discharge stop switch, so-called secondary pipe. (For example, see Patent Document 1).
[0005]
FIG. 4 shows a running water detection device and sprinkler equipment configured based on Patent Document 1 described above. The running water detecting device 51 is an automatic opening / closing valve having a lift valve structure in which a bottomed cylindrical valve body 56 slides along the inner wall of the valve box. The primary side I is connected to a water source, and the secondary side II is connected to the sprinkler head 55.
[0006]
The open / close state of the valve body 56 is monitored by detecting the movement of the valve body 56 due to the opening / closing of the valve body 56 by a limit switch 54 provided at the tip of an elevating shaft protruding from the valve body 56 to the outside of the valve box. The space formed by the inside of the valve body 56 and the inner wall of the valve box, the primary side and the secondary side are communicated by a pipe 58, and the space between the space of the pipe 58 and the secondary side II is always present. An open solenoid valve 52 is provided.
[0007]
When the sprinkler head 55 provided on the secondary side II malfunctions, the solenoid valve 52 is closed and the internal space of the valve body 56 is filled with fire water on the primary side I so that the valve body 56 is closed. The seat is seated to shut off the water supply to the secondary side II.
[0008]
Although the closing of the solenoid valve 52 is operated by a push button switch in Patent Document 1, in FIG. 4, the closing of the solenoid valve 52 is determined by a fire signal from the fire detector 53 and a valve open signal from the limit switch 54. ing.
[0009]
More specifically, the electromagnetic valve 52 is closed when there is no signal from the fire detector 53 when the limit switch 54 outputs the valve open signal. When the sprinkler head 55 operates in a fire, the fire extinguishing water in the secondary side II flows out of the sprinkler head 55, so that the pressure in the secondary side II is reduced and the valve body 56 of the flowing water detecting device 51 is opened.
[0010]
When the valve body 56 of the flowing water detecting device 51 is opened, the limit switch 54 operates, and outputs a valve opening signal to the signal control device 57. At this time, if there is a fire signal from the fire detector 53 connected to the signal control device 57, the fire extinguishing water is supplied from the primary side I to the secondary side II while maintaining the state as it is, and the fire extinguishing is performed from the sprinkler head 55. Spray water to control and suppress fires.
[0011]
When the sprinkler head 55 malfunctions, when the limit switch 54 operates and outputs a valve opening signal to the signal control device 57, there is no fire signal from the fire detector 53, so the electromagnetic valve 52 is closed. When the valve body 56 is seated on the valve seat, the supply of fire-extinguishing water to the secondary side II is stopped to prevent water damage.
[0012]
In addition to the above, a normally open motor-operated valve 61 is installed in series with a flowing water detection device 62 on a pipe extending from a water source to the sprinkler head 55 as shown in FIG. There is a sprinkler facility that starts the valve 61 when a running water detection signal accompanying the operation of the sprinkler head 55 is received and there is no fire signal from the fire detector 53 (for example, see Patent Document 2).
[0013]
[Patent Document 1]
Japanese Patent Publication No. 35-16346 (page 1-2, FIG. 1)
[Patent Document 2]
Japanese Patent Application Laid-Open No. 10-5365 (Pages 3-7, FIGS. 1, 5)
[0014]
[Problems to be solved by the invention]
However, in the sprinkler equipment shown in FIG. 4, the sprinkler head 55 malfunctioned and the fire extinguishing water on the secondary side II flowed out, so that the fire extinguishing water in the secondary side II was depressurized and the valve body 56 was opened. At this time, since the fire signal from the fire detector 53 is not output, the solenoid valve 52 is closed. However, when the solenoid valve 52 is closed, the valve body 56 moves in a direction of sitting on the valve seat, and the valve of the limit switch 54 is closed. The open signal disappears.
[0015]
When the valve opening signal of the limit switch 54 is lost, the solenoid valve 52 returns to the open state, the valve body 56 is opened again, and the opening and closing operation of the valve body 56 is repeated, and the fire extinguishing water to the secondary side II Supply could not be completely shut off.
[0016]
In view of the above, the present invention has been made in view of the above problems, and aims to provide a water flow detection device that can shut off water supply to a secondary side pipe when a valve element of the water flow detection device is opened during a non-fire, and can maintain the cutoff state. I have.
[0017]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is an on-off valve provided in fire extinguishing equipment, wherein a primary side chamber whose inside is connected to a water supply side and a secondary side chamber connected to a sprinkler head side. A communication port is provided in the partition, and a slidable valve element is mounted on the secondary side of the communication port along the inner wall of the valve box. The formed control room communicates with the primary side and the secondary side, and an electromagnetic valve that closes when energized is provided between the control room and the secondary side, and between the primary side and the control room, An orifice having a smaller diameter than the valve seat diameter of the solenoid valve, and a check valve that prevents backflow to the primary side is provided, and in a flowing water detecting device having flowing water detecting means capable of detecting a phenomenon caused by operation of a sprinkler head, When the sprinkler head is activated, the spring When there is no fire signal from a fire detector provided near the head, the solenoid valve is closed and the valve body can be seated on a valve seat, and a pressure reduction signal of a pressure switch provided on the secondary side or running water detection. This is a running water detection device that keeps the electromagnetic valve closed when a signal is output from the means, and releases the electromagnetic valve from being closed by a fire signal from a fire detector.
[0018]
According to a second aspect of the present invention, in the running water detecting device having the above-mentioned configuration, the running water detecting means has a shaft protruding from the valve body to the outside of the valve box, and is provided with a limit switch provided at a tip of the shaft. 2. The running water detecting device according to claim 1, wherein the opening and closing of the valve body can be detected, and the operation of the sprinkler head is determined using a valve opening signal by the operation of the limit switch.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a system diagram of a sprinkler facility provided with a flowing water detection device according to an embodiment of the present invention. FIG. 2 is a sectional view of the flowing water detecting device provided in FIG. 1, and FIG. 3 is an operation flow of the flowing water detecting device of the present invention.
[0020]
As shown in FIG. 1, the sprinkler equipment provided with the flowing water detection device of the present invention includes a water source 1, a water supply device 2, a flowing water detection device 3, a sprinkler head 4, a fire detector 5, a signal control device 6, a pressure switch PS, Consists of
[0021]
The water source 1 is a water tank for storing fire extinguishing water, and the water supply device 2 is a device for pumping fire extinguishing water from the water source 1 to the pipe 7 and supplying it to the sprinkler head 4 connected to the pipe 7. At the time of warning, the pipe 7 is filled with fire extinguishing water up to the end sprinkler head 4. In addition, it is also possible to use domestic water supply equipment instead of the water source 1 and the water supply device 2.
[0022]
As shown in FIG. 2, the flowing water detecting device 3 has an interior of the valve box which is partitioned by a partition 8 into a primary chamber I and a secondary chamber II, and the partition 8 communicates with the primary chamber I and the secondary chamber II. 9 are drilled.
[0023]
A bottomed cylindrical valve body 10 is mounted on the valve seat with the secondary chamber II side of the communication port 9 as a valve seat. The upper portion of the valve body 10 has a flange shape, the side surface of the flange is slidable along the inner wall of the valve box, a horizontal groove is engraved on the side surface of the flange, and a ring-shaped watertight member is formed in the horizontal groove. 11 are provided.
[0024]
A limit switch 13 is provided near the tip of a shaft 12 provided to protrude from the valve body 10 to the outside of the valve box. The limit switch 13 can detect vertical movement caused by opening and closing of the valve body 10.
[0025]
More specifically, the limit switch 13 has a b-contact that is turned on when an object is separated from the actuator, and the actuator is always in contact with the plate P urged by the resilient body.
[0026]
When the valve body 10 is opened, the shaft 12 also moves upward, and the plate P in contact with the actuator is pushed by the shaft 12 and moves away from the actuator, so that the limit switch 13 is turned on, and a valve opening signal is sent to the signal control device 6. Send.
[0027]
A space is formed in the upper part of the valve body 10 by the inner wall of the valve box and the lid 14, and this space is defined as a control room 15. A resilient body 16 is provided between the valve body 10 and the lid 14, and urges the valve body 10 toward the valve seat.
[0028]
The control room 15 has a connection port 17 leading to the outside, and a pipe 18 leading to the primary chamber I and the secondary chamber II is connected to the connection port 17. A check valve 19 through which water can flow from the primary chamber I side to the control chamber 15 and an orifice 20 are installed in an area 18A between the primary chamber I and the control chamber 15 of the pipe 18, and An electromagnetic valve 21 which is always open and closes when energized is provided in the space 18B up to the secondary chamber II.
[0029]
The diameter of the orifice 20 is smaller than the valve seat diameter of the solenoid valve 21.
[0030]
The solenoid valve 21 is connected to the signal control device 6 and can be opened and closed by a signal from the signal control device 6. It is preferable that the solenoid valve 21 has a simple mechanism and a highly reliable direct acting type. In addition, a valve having a structure in which the internal valve body is closed when power is supplied is used.
[0031]
The valve body of the solenoid valve 21 is always open due to the structure in which the valve body is closed at the time of energization. There will be no hindrance to fire fighting activities by the sprinkler equipment installed.
[0032]
The sprinkler head 4 has a heat-sensitive operating mechanism that supports the valve body inside, and the heat-sensitive operating mechanism is operated by the heat of fire to open the valve body, and the inside of the pipe connected to the secondary side II The fire water is sprayed.
[0033]
The fire detector 5 detects a fire based on the heat or smoke of the fire, and outputs a fire signal. Preferably, the fire detector 5 is of a type that operates faster than the sprinkler head 4.
[0034]
The signal control device 6 receives the valve opening signal of the flowing water detection device 3 and the fire signal of the fire detector 5, and outputs a start signal of the water supply device 2 according to each signal state, or is provided in the flowing water detection device 3. The opening and closing of the solenoid valve 21 is controlled.
[0035]
The pressure switch PS is provided on a pipe connected to the secondary chamber II of the flowing water detection device 3, and monitors the pressure of the fire extinguishing water filled in the pipe. When the pressure of the fire extinguishing water falls below a predetermined value, a pressure reduction signal is output from the pressure switch PS to the signal control device 6.
[0036]
Next, the operation of the sprinkler equipment provided with the above-mentioned flowing water detecting device will be described with reference to FIG.
[0037]
When a fire occurs, the fire detector 5 operates and outputs a fire signal to the signal control device 6. When the sprinkler head 4 operates following the operation of the fire detector 5, fire extinguishing water in the pipe connected to the secondary side chamber II blows out from the sprinkler head 4.
[0038]
The pressure in the pipe connected to the secondary chamber II is reduced by the operation of the sprinkler head 4, and the supply amount of the fire extinguishing water from the primary chamber I to the control chamber 15 is restricted by the orifice 20. Regarding the force applied to the valve body 10, the pressure applied from the primary side chamber I exceeds the pressure in the control chamber 15 and the force of the resilient body 16, the valve body 10 moves slightly in the opening direction, and the flow rate corresponding to the operation of the sprinkler head flows. The fire water flows from the primary room I to the secondary room II.
[0039]
When the valve body 10 is opened, the shaft 12 also moves upward, pushes up the plate P, turns on the limit switch 13, and outputs a valve opening signal to the signal control device 6.
[0040]
When receiving the valve opening signal from the limit switch 13, the signal control device 6 activates the water supply device 2 and pumps out fire extinguishing water from the water source 1 if the fire signal from the fire detector 5 is output, Fire extinguishing water is supplied to a sprinkler head 4 provided in a pipe connected to the secondary side chamber II.
[0041]
When the water supply device 2 is started, pressurized fire extinguishing water is sent from the pipe 7 through the primary side chamber I, and the valve body 10 moves to the fully open position. The fire extinguishing water is sprayed from the sprinkler head 4 to suppress and extinguish the fire.
[0042]
Subsequently, a case where the sprinkler head 4 malfunctions other than during a fire will be described.
[0043]
When the sprinkler head 4 operates, the valve body 10 of the flowing water detecting device 3 opens to the extent that the flow amount corresponding to the operation of the sprinkler head flows, as described above, and the limit switch 13 outputs a valve opening signal to the signal control device 6.
[0044]
In addition, since the fire extinguishing water in the pipe connected to the secondary side chamber II flows out of the sprinkler head 4 by the operation of the sprinkler head 4, the pressure switch PS detects the reduced pressure of the fire extinguishing water and sends the pressure to the signal control device 6. Output a signal.
[0045]
At that time, since the fire signal is not input from the fire detector 5 to the signal control device 6, the signal control device 6 closes the solenoid valve 21, maintains the state, and sends the fire extinguishing water of the primary room I to the control room 15. Inflow.
[0046]
When the fire extinguishing water flows into the control chamber 15, the valve body 10 slides downward and is seated on the valve seat, and the valve opening signal disappears, but since the pressure reducing signal is continuously output from the pressure switch PS, The closed state of the solenoid valve 21 is maintained, the flow of water from the primary side chamber I to the secondary side chamber II is cut off, and damage to water damage due to malfunction of the sprinkler head 4 is reduced.
[0047]
When the solenoid valve 21 is closed, the solenoid valve 21 is kept closed, or the solenoid valve 21 is closed so as to notify a manager or the like of the pressure reduction of the fire extinguishing water in the pipe connected to the secondary side chamber II to prompt the recovery of the flowing water detection device. It is also possible to output a water cutoff alarm or a secondary side decompression alarm.
[0048]
When the fire detector 5 is operated with the solenoid valve 21 closed, the power supply to the solenoid valve 21 is immediately stopped and the solenoid valve 21 is opened to open the valve body 10 and the sprinkler head 4. Can be supplied with fire extinguishing water.
[0049]
Instead of the valve opening signal described as the flowing water detecting means for detecting the phenomenon caused by the operation of the sprinkler head 4 in the above-described embodiment, for example, an operation signal from the sprinkler head described in JP-A-2-209164. Or a pressure reduction signal from a pressure reduction switch provided in a pipe to which the sprinkler head is connected.
[0050]
In addition, instead of the shaft 12 and the limit switch 13 of the flowing water detecting device described in the above embodiment, a hole is formed in the valve seat surface to communicate with the outside, and a pressure switch is connected to the hole, and the valve body 10 is opened. Thus, it is also possible to detect the pressure of the water flowing into the hole and generate a valve opening signal.
[0051]
Alternatively, it is also possible to use a signal from a flowing water detecting device provided separately from the flowing water detecting device of the present invention.
[0052]
【The invention's effect】
As described above, according to the present invention, the closed state of the electromagnetic valve provided in the flowing water detecting device having the above-described configuration is determined by the signal of the pressure switch provided on the secondary side or the output of the signal from the flowing water detecting means. In this case, when the sprinkler head malfunctions, the water supply to the sprinkler head can be cut off and maintained, and the water damage can be reduced.
[Brief description of the drawings]
FIG. 1 is a system diagram of a sprinkler equipment provided with a flowing water detecting device of the present invention. FIG. 2 is a cross-sectional view of the flowing water detecting device of the present invention at the time of caution. FIG. 3 is an operation flow of the flowing water detecting device of the present invention. [4] System diagram of conventional water detection device and sprinkler equipment [Fig. 5] System diagram of sprinkler equipment of Patent Document 2 [Description of symbols]
Reference Signs List 3 running water detection device 4 sprinkler head 5 fire detector 10 valve body 12 shaft 13 limit switch 15 control room 21 solenoid valve PS pressure switch

Claims (2)

An on-off valve provided in a fire extinguishing system, in which a primary chamber connected to a water supply side and a secondary chamber connected to a sprinkler head side are separated by a partition wall, and a communication port is provided in the partition wall. A slidable valve element is placed on the secondary side of the communication port along the inner wall of the valve box,
A control chamber formed by the valve body and the inner wall of the valve box communicates with the primary side and the secondary side, and an electromagnetic valve that closes when energized is provided between the control chamber and the secondary side,
Between the primary side and the control chamber, an orifice having a smaller diameter than the valve seat diameter of the solenoid valve and a check valve for preventing backflow to the primary side are provided.
In a flowing water detecting device having flowing water detecting means capable of detecting a phenomenon caused by operation of a sprinkler head,
When the sprinkler head is operated, if there is no fire signal from a fire detector provided near the sprinkler head, the solenoid valve is closed and the valve body can be seated on the valve seat, and the pressure provided on the secondary side When there is output of a pressure reduction signal of a switch or a signal from flowing water detecting means, the closed state of the electromagnetic valve is maintained, and the closing of the electromagnetic valve is released by a fire signal of a fire detector, apparatus. In the flowing water detection device having the above-described configuration, the valve body has a shaft protruding outside the valve box as the flowing water detecting means, and the opening and closing of the valve body can be detected by a limit switch provided at the tip of the shaft. 2. The running water detecting device according to claim 1, wherein the operation of the sprinkler head is determined using a valve opening signal caused by the operation of the limit switch.

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