JP2005334672A - Fire extinguishing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To discharge a foaming water solution promptly after the outbreak of fire by draining extra water at the outbreak of fire to shorten the discharge time of water from a fire extinguishing head. <P>SOLUTION: In this fire extinguishing equipment comprising a mixer 14 and an undiluted solution tank 16 storing a foaming undiluted solution, a prevention valve 17 is provided between the mixer and the undiluted solution tank to control so that the foaming undiluted solution does not flow out of the undiluted solution tank when no fire breaks out. Secondary side piping 27 of a water flow detector 10 is provided with a closed type fire extinguishing head 28, and the piping is filled with water when monitoring. In case of a fire, water is discharged from the fire extinguishing head, and then the foaming water solution is discharged. Primary piping 11 of the water flow detector is provided with a normally closed remote opening valve 36 opened for a fixed time in case of the fire, to drain water in the piping. Water filled in the piping is replaced with the foaming water solution. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fire extinguishing facility that extinguishes a fire.

Conventionally, foam-type fire extinguishing facilities are generally widely provided in underground parking lots of buildings. This is because it is suitable for oil fires caused by gasoline and oil in vehicles. In the foam fire-extinguishing equipment, the foam solution stored in the stock solution tank and the water from the water source are mixed to produce a foam aqueous solution, and the foam aqueous solution is filled in the pipe at the time of warning. In the event of a fire, the foam aqueous solution is discharged from the foam head as a fire extinguishing head in the state of an aqueous solution or foamed into a foam shape and discharged (for example, see Patent Document 1).
JP2001-573

  By the way, in the summer of a parking lot or the like, the temperature is very high, the liquid in the pipe expands, and the sensing head may explode. In addition, the vehicle may come into contact with the piping and the sensing head and damage the head, and the foam aqueous solution may flow out to the outside despite a fire. When this aqueous foam solution flows out, there are some which are not so good for the environment due to their physical properties.

  Therefore, it is conceivable to fill the pipe with water from the environmental point of view. In such a fire extinguishing facility, excess water is drained in the event of a fire to reduce the time that water is discharged from the fire extinguishing head, so that the foam aqueous solution is discharged within about 10 minutes after the fire occurs. The purpose is to do.

  The present invention has been made in order to solve the above-described problems. A flowing water detector, a primary pipe connected to a primary side of the flowing water detector, and provided with a water source on a proximal end side, and the flowing water detector. In the fire extinguishing equipment having a secondary side pipe connected to the secondary side of the pipe and a secondary side pipe provided with a fire extinguishing head, the primary side pipe or the secondary side pipe is provided with a normally closed remote release valve that opens for a certain time in the event of a fire It is provided and drains the water in the piping. In addition, the apparatus includes a mixer having a water source connected to the base end via a pipe, and a stock tank connected to the mixer and storing the foam stock solution. It is characterized by substituting with an aqueous solution.

  In the present invention, a normally open remote opening valve that is opened for a certain time in the event of a fire is provided on the base end side of the secondary side pipe, so that the water enclosed in the primary side pipe can be quickly drained during normal times. It is possible to quickly discharge water from the fire extinguishing head as a fire extinguishing agent using a foam aqueous solution having a higher fire extinguishing performance than water.

  In addition, since a normally closed blocking valve that opens in the event of a fire is provided between the mixer and the stock solution tank, only water flows out from the fire extinguishing head during a non-fire. Therefore, it is possible to prevent the foam extinguishing agent from flowing into the protective compartment when it is not a fire. Normally, only water from the water source is sealed in the primary side pipe and the secondary side pipe so that the aqueous foam solution is not mixed in the pipe. Even if the fire extinguisher head breaks out and breaks, no foam extinguishers will flow out. Therefore, fire extinguishing equipment that is good for the environment can be constructed.

Embodiment 1
FIG. 1 shows a system diagram of a fire extinguishing facility according to Embodiment 1 of the present invention. In FIG. 1, 10 is a water flow detector installed for each protection section. A pipe connected to the primary side based on the flowing water detector 10 is referred to as a primary side pipe 11, and a pipe connected to the secondary side is referred to as a secondary side pipe 27. In a normal monitoring state, the primary side pipe 11 and the secondary side pipe 27 are filled with water. In the figure, the black valve is normally closed and the white valve is normally open.

  As the flowing water detector 10, for example, an NS valve disclosed in JP-A-7-108069 is used. Here, the NS valve has two functions in addition to the flowing water detection function for detecting the flowing water phenomenon accompanying the pressure drop in the pipe. One is a pressure-regulating / filling function that regulates the inside of the secondary side pipe 27 to a predetermined pressure. Another function is a valve function (opening), and this valve (not shown) is controlled to open in the event of a fire. In the following description, the flowing water detector 10 is also referred to as an NS valve.

  Reference numeral 11 denotes a primary side pipe, and a water tank (not shown) and a pump 13 as a water source are provided on the base end side to constitute a pressurized water supply apparatus. A mixer 14 is provided in the middle of the primary side pipe 11. A stock solution tank 16 is connected to the mixer 14 via a pipe 15. The mixer 14 mixes the foam stock solution stored in the stock solution tank 16 and the water from the water tank to produce a foam aqueous solution having a predetermined concentration.

  In the first embodiment, the mixing method is a pressure proportioner method in which water is fed into the stock solution tank 16 from the water tank side via a water feed pipe, and the foam stock solution in the tank 16 is pressurized and discharged. There are several types of methods, for example, a so-called venturi proportioner method may be used. In this case, when the water from the water tank pumped by the pump 13 passes through the mixer 14, the mixer 14 sucks the foam stock solution in the stock solution tank 16 by the venturi action.

  The pipe 15 is provided with a raw liquid blocking valve 17 (hereinafter also referred to as a blocking valve), a liquid feeding check valve 18 and a liquid feeding gate valve 19 from the mixer 14 side, and is manually operated in parallel with the raw liquid blocking valve 17. A stock solution blocking valve 17C is provided. This blocking valve 17 is normally closed and is opened in the event of a fire. In the drawing, the blocking valve 17 is shown in the case where it is provided in a pipe 15 provided between the mixer 14 and the stock solution tank 16, but this blocking valve 17 is a water supply pipe connecting the stock solution tank 16 and the water tank side. May be provided. The liquid feeding check valve 18 is provided to prevent the water in the equipment piping from flowing into the stock solution tank 16 when the pressure balance is unstable, such as at the initial startup of the equipment. Further, when such a piping system is used, the differential pressure before and after the stock solution blocking valve 17 becomes 0 when the equipment is started up, so that the torque required to open and close the blocking valve 17 is small, and manual operation is facilitated.

  In the first embodiment, the mixer 14, the pipe 15, the raw liquid tank 16, the raw liquid blocking valves 17, 17C, the liquid feeding check valve 18, and the liquid feeding gate valve 19 are housed in one tank unit TU. By providing this tank unit TU in the existing sprinkler fire extinguishing equipment, it becomes possible to switch the sprinkler fire extinguishing equipment to a fire extinguishing equipment using foaming chemicals. A blocking valve may be configured by providing a three-way valve between a pipe branched from the liquid feeding pipe and the mixer 14 and connecting the three-way valve to the raw liquid outlet of the raw liquid tank 16.

  A manual valve 21 that is normally closed is branched from the secondary side of the mixer 14 of the primary pipe 11. The valve 21 is an aqueous solution collection port, which is opened at the time of inspection or the like, and is used for collecting the foam aqueous solution mixed by the mixer 14. The aqueous solution collection port 21 may be constituted by a three-way valve, and a fixed orifice is provided to restrict the flow rate. Further, a water stop valve 22 that is normally opened is provided on the secondary side of the valve 21 of the primary side pipe 11.

  Reference numeral 23 denotes a pressure air tank connected to the primary side pipe 11 for maintaining the inside of the pipes 11 and 27 at a predetermined pressure. Reference numeral 24 denotes a jack pump connected to the pressure air tank 23, which is a smaller pump than the pump 13. Reference numeral 25 denotes a basin connected to the pump 13.

  Next, the secondary side of the flowing water detection device (vessel) 10 (NS valve) will be described. The secondary pipe 27 is provided with a plurality of closed fire extinguishing heads 28. An auxiliary water spigot 29 is provided at the end of the secondary side pipe 27. The auxiliary water spigot 29 protects the place where the fire extinguishing head 28 is difficult to install, such as a staircase or an electric room. By opening the built-in valve and extending the hose, water or foam solution can be discharged from the nozzle at the tip. . The auxiliary water spigot 29 may be provided not in the end of the secondary side pipe 27 but in the middle.

  A fire detector 30 is provided in the protective section where the fire extinguishing head 28 is installed. The fire detector 30 is connected to a fire receiver 32 via a signal line, and the fire receiver 32 is connected to a fire extinguishing system control panel 33 (hereinafter referred to as a control panel) via a signal line. The control panel 33 is connected to the flowing water detector 10, the blocking valve 17, and a remote opening valve 36, which will be described later, via signal lines. When the fire detector 30 is operated, the control panel 33 receives a transfer signal from the fire receiver 32 and controls the main valve, the blocking valve 17 and the remote release valve 36 of the NS valve 10 to open. To do. The control panel 33 has a built-in timer, and controls the remote release valve 36 to be closed when a predetermined time has elapsed since the remote release valve 36 was opened.

  Reference numeral 34 denotes a quick drainage part provided by branching from the primary side pipe 11. The rapid drainage section 34 includes a constant flow valve 35 and a remote opening valve 36. The constant flow valve 35 is for making the flow rate flowing in the pipe constant, and an orifice may be used. An example of the constant flow valve 35 will be described. If the pump 13 has a water supply capacity of about 500 L / min and the water discharge from the fire extinguishing head 38 is discharged at 100 L / min, the flow rate of the constant flow valve 35 is 400 L / min. Is set.

  The remote opening valve 36 is normally a closed valve. When the remote opening valve 36 is opened, the water in the primary side pipe 11 is drained to the outside via a drain pipe (not shown) or returned to the water tank via a pipe (not shown). It is. The remote opening valve 36 is controlled by the control panel 33 so that it is opened only for a certain period of time in the event of a fire and is closed after the certain period of time has elapsed.

  Here, the fixed time is the time required for draining the water sealed in the primary side pipe 11 in the event of a fire, in other words, the pump 13 is activated and the aqueous foam solution mixed in the mixer 14 is secondary side. This is the time it takes to be sent to the pipe 27, that is, the time required for the water in the primary side pipe 11 to be replaced with the foam aqueous solution. This time is a value that is appropriately changed depending on conditions such as the position where the quick drainage unit 34 is provided, the pipe diameter, and the pipe length. Note that a pilot valve 36C is connected to the remote opening valve 36, and the pilot valve 36C is opened, and the cylinder chamber of the remote opening valve 36 is opened by depressurizing or pressurizing.

  This fire extinguishing equipment drives the pump 13 at the initial stage to supply water from the water tank to the primary side pipe 11 side. At this time, the blocking valve 17 is closed. In this way, the aqueous foam solution does not flow into the secondary side of the primary side pipe 11 and the flowing water detector 10, that is, the secondary side pipe 27, and only the water from the water source is sealed. A state where only water is filled is maintained.

  A case where a fire occurs in such a fire extinguishing facility will be described. When a fire occurs in the protected area, the fire detector 30 is first activated to send a fire signal to the fire receiver 32. The fire receiver 32 transmits a fire signal to the control panel 33. Here, the control panel 33 performs control so that the main valve of the NS valve 10 is opened.

  Subsequently, when the fire extinguishing head 28 is operated, the pressurized water in the secondary side pipe 27 is released. Then, the water flow detector 10 detects the pressure reduction or the water flow in the pipe 27 and outputs a water flow signal to the control panel 33. Here, the fire signal and the running water signal are input to the control panel 33. By inputting these two signals, the control panel 33 determines the occurrence of a fire, outputs an opening signal, and opens the blocking valve 17 and the remote opening valve 36. Moreover, the water in the secondary side pipe 27 is discharged from the fire extinguishing head 28, the pressure in the primary side pipe 11 is reduced, and the pressure switch (not shown) of the pressure air tank 23 detects the pressure drop, whereby the pump 13 is activated. Is done.

  When the pump 13 is activated, the water in the water tank is pumped to the mixer 14 side. Further, this water is supplied from the primary side pipe 11 to the stock solution tank 16 through the water supply pipe. The foam stock solution pushed out from the tank 16 flows into the mixer 14 through the open blocking valve 17. In the mixer 14, a foam aqueous solution having a predetermined concentration is generated, and the foam aqueous solution is supplied to the secondary side pipe 27 side. In this way, the foam aqueous solution passes through the water flow detector 10 and is discharged from the fire extinguishing head 28 to extinguish the fire.

  Next, the operation of the remote opening valve 36 of the quick drain part 34 will be described. For example, in the case of a vehicle fire in a parking area or the like, it is desirable to quickly discharge a foam aqueous solution suitable for an oil fire from the fire extinguishing head 28 to increase the fire extinguishing efficiency. However, in the fire extinguishing equipment of this embodiment, when monitoring from an environmental standpoint, since the pipes 11 and 27 are filled with water, it is necessary to drain this water first. Therefore, in the event of a fire, the remote release valve 36 is opened, the excess water is drained, the time for water to be discharged from the fire extinguishing head 28 is shortened, and the foam aqueous solution is discharged within about 10 minutes after the fire occurs. So that

  When the remote opening valve 36 is opened by the opening signal from the control panel 33, the water in the primary side pipe 11 is pumped by the pump 13 and drained. After a certain period of time has elapsed, a foam aqueous solution having a predetermined concentration is generated from the mixer 14, and after the water in the primary side pipe 11 is replaced with the foam aqueous solution, the remote release valve 36 is closed. Since the flow rate drained by the constant flow valve 35 is limited, water is discharged from the fire extinguishing head 28 with a sufficient amount of water even when drained.

  If the remote opening valve 36 is not opened when the fire extinguishing head 28 is operated, only the water is discharged from the fire extinguishing head 28 for a certain period of time, so the fire extinguishing efficiency is not sufficient. Thus, by providing the remote release valve 36 in this way, it becomes possible to drain the water enclosed in the primary side pipe 11 in a normal state quickly, and the fire extinguishing performance is higher than that of the water quickly from the fire extinguishing head 28. The aqueous foam solution can be discharged as a fire extinguisher.

  By the way, at the initial stage of the fire, since the secondary side pipe 27 is filled with water, water is discharged from the fire extinguishing head 28. At this time, it is preferable that water is discharged from the fire extinguishing head 28 at a high pressure (about 4 kg / cm @ 2). This is because even an oil fire has the effect of sufficiently suppressing or preventing the spread of the fire by spraying and discharging water at a high pressure. As described above, in the present fire extinguishing equipment, the pipes 11 and 27 are filled with water at the time of monitoring, and after the water is discharged from the fire extinguishing head 28 in the event of a fire, the aqueous foam solution is discharged. Instead of spraying water at high pressure, the water spray density from the fire extinguishing head 28 may be increased to about 8 L / min · m 2 by narrowing the mounting pitch interval of the fire extinguishing head 28. This will prevent the spread of

  Next, a case where the fire extinguishing head 28 is damaged due to an unexpected accident or the like will be described. In this case, water in the secondary side pipe 27 flows out from the damaged fire extinguishing head 28. Here, the NS valve 10 is provided with a bypass pipe (not shown) that connects the primary side and the secondary side, and the pressure adjustment and filling function of the secondary side pipe 27 is performed through this pipe. Therefore, although the main valve of the NS valve 10 is closed, the water in the primary side pipe 11 flows to the secondary side pipe 27 through this bypass pipe.

  However, since the fire detector 30 is not operating, the blocking valve 17 remains closed, and the blocking valve 17 prevents the foam aqueous solution from flowing out to the secondary side pipe 27 side. Accordingly, since only water flows out from the fire extinguishing head 28, it is possible to prevent the fire extinguishing agent from flowing out into the protective compartment during a non-fire (when no fire). Thus, in the fire extinguishing equipment of this embodiment, the control panel 33 and the blocking valve 17 are controlled so that the foam stock solution does not flow out of the stock solution tank 16 except during a fire.

  As described above, during normal monitoring, only the water from the water source is sealed in the primary side pipe 11 and the secondary side pipe 27 so that the aqueous foam solution is not mixed in the pipes 11 and 27. In the event of a fire, no foam will flow out. Therefore, fire extinguishing equipment that is good for the environment can be constructed.

  In this fire extinguishing equipment, a case will be described in which it is tested (inspected) whether a foam aqueous solution having a predetermined concentration is generated by the mixer 14. In this case, first, the water stop valve 22 is closed, the blocking valve 17C is manually opened, and the aqueous solution collection port 21 is further opened. Then, the pump 13 or the jack pump 24 is activated, and a predetermined amount of the foam aqueous solution flowing out from the aqueous solution sampling port 21 is collected using a measuring device, and it is measured whether the concentration is a predetermined concentration. Thereafter, the stop valve 17C is closed, the pump 13 is operated until there is no foam stock remaining on the secondary side of the stop valve 17C, the aqueous solution collection port 21 is closed, and finally the stop valve 22 is opened.

  By providing such an aqueous solution sampling port 21, it is possible to test whether an appropriate foam aqueous solution is generated without causing a large amount of the foam stock solution to flow outside. Moreover, since the water stop valve 22 is closed at the time of a test, since the foam aqueous solution does not enter the secondary side pipe 27 and the primary side pipe 11, the state where only water is sealed in the normal pipes 11 and 27 is maintained. be able to.

  Next, a method of measuring the aqueous solution replacement time until the water in the pipes 11 and 27 is changed to the foam aqueous solution will be described. For example, the stock solution tank 16 is replaced with a tank containing colored water (inspection solution) only during the test. Then, the valve of the auxiliary water spigot 29 is opened to create the same state as when the fire extinguishing head 28 is opened in the event of a fire. An opening signal is output from the control panel 33 to the NS valve 10 and the remote opening valve 36.

  In this way, colored water and water are mixed by the mixer 14, and water is forcibly drained from the rapid drainage section 34. When a predetermined time elapses, colored water comes out from the nozzle of the auxiliary sprinkler 29 and the remote opening valve 36, so that the replacement time can be measured respectively. Further, a terminal test valve may be provided in place of the auxiliary water sprinkler 29, and the time until the test liquid is released from the terminal test valve may be measured. Here, colored water is used as the test solution, but the inside of the piping may be cleaned using a pipe cleaning solution. Alternatively, a test tank containing a test solution may be permanently installed as equipment, and the test blocking valve provided between the test tank and the mixer 14 may be opened only during the test.

  There are two types of inspection (test) of fire extinguishing equipment: a test using a fire extinguishing agent (foam aqueous solution) and a test not using a fire extinguishing agent (water discharge test). The control may be changed. For example, since the water discharge test confirms that water is discharged normally, the blocking valve 17 is not opened even if there is a flow signal during the water discharge test. In addition, since the interlock test is for confirming whether the valve is normally interlocked and opened by a signal, control is performed so that the blocking valve 17 is opened by a flowing water signal during the interlock test. This control pattern can be registered in the control panel 33. At the time of this interlocking test, the water stop valve 22 or the liquid supply gate valve 19 is closed so that the foam stock solution in the tank 16 does not flow to the secondary side pipe 27 side.

Embodiment 2
Another embodiment of the rapid drainage unit 34 will be described. Although a timer is built in the control panel 33 to control the opening time of the remote opening valve 36, it may be as follows. An electrical conductivity meter, a saccharimeter, or a refractive index measuring device is provided at an appropriate portion of the quick drainage section 34 or the pipes 11 and 27. Since the aqueous foam solution and water have different electrical conductivity, sugar content, or refractive index, if these instruments are installed in the pipes 11 and 27, it can be detected that the water has been replaced with the aqueous foam solution in the event of a fire. When it is detected that the aqueous foam solution has been replaced, the remote opening valve 36 is controlled to close.

  In a small-scale facility having only one flowing water detector 10 as shown in FIG. 1, the water in the secondary side pipe 27 is immediately replaced with the foam aqueous solution in the event of a fire. Low. On the other hand, for example, in the case of a 10-story building where a fire occurs on the 9th floor portion, the primary side pipe 11 is long, so the necessity of providing the quick drainage section 34 is increased. In this case, the rapid drainage section 34 is provided at the uppermost portion of the rising main pipe (primary pipe) called a soot pipe.

  In the case of this 10-story building, for example, the rapid drainage section 34 is operated only in the case of a fire on the fourth floor or higher, and the rapid drainage section 34 is not operated in a fire on the first to third floors below it. It is also possible to change the time during which the remote release valve 36 is opened for each fire occurrence floor. Further, the quick drainage 34 may be installed at the end of the secondary pipe 27, the farthest pipe on the primary side of the flowing water detector 10, or the like. Further, the remote opening valve 36 may be controlled to be opened immediately when the fire detector 30 is operated. In this way, it is possible to discharge the foam aqueous solution almost simultaneously with opening of the fire extinguishing head 28.

Embodiment 3
Another embodiment of the stock solution blocking valve 17 will be described. The blocking valve 17 may be always opened. In this case, when the water flow detector 10 is operated and a water flow signal is generated, if the fire signal from the fire detector 30 is not generated, the control panel 33 closes the opened stop valve 17. Control. In addition to the pump 13 for pumping the water in the water tank, if another pump is prepared and the water supply pipe is eliminated so that water is supplied into the stock solution tank 16 only in the event of a fire, a blocking valve is provided. 17 may not be provided. If the fire is not an oil fire but a normal fire, the fire may be extinguished with water without opening the stop valve 17. By providing the blocking valve 17 in this way, it is possible to select fire extinguishing with water or extinguishing with an aqueous foam solution according to the fire state.

Other Embodiments The present invention is characterized by the blocking of the stop valve 17, the quick drain 34, and the water in the pipe at normal times. Therefore, since other elements of the fire extinguishing equipment are not particularly limited, this point will be described.

  In the first embodiment, a case where a closed type head such as a sprinkler head is used as the fire extinguishing head 28 has been described. However, a closed type foam head or an open type head may be used. Moreover, although the special flowing water detector called NS valve 10 was used, a normal pre-acting valve may be used, and an electric valve and a flowing water detector may be provided separately.

  Further, as a fire extinguishing equipment, a wet pre-actuated equipment is taken as an example, but the secondary side pipe 27 may be a dry type, and a valve that is opened only by decompression in the pipe 27 is used instead of the pre-actuated type. The present invention may be applied to a normal sprinkler fire extinguishing equipment or a foam fire extinguishing equipment using a simultaneous opening valve. In this case, since the fire detector 30 is not necessary, the opening of the blocking valve 17 and the remote opening valve 36 is based on the assumption that a fire has occurred when the flowing water signal of the flowing water detector 10 is generated. Control to release.

  A fire determination switch may be provided in the control panel 33, and when the fire determination switch is pressed, the control may be performed in the same manner as when a fire signal is received from the fire detector 30. That is, when the fire determination switch is pressed and a running water signal is generated, the blocking valve 17 is opened and the remote opening valve 36 is opened. Further, when the line of the fire detector 30 is disconnected or fails, a failure signal is output from the fire receiver 32 to the control panel 33. When this failure signal is received, the control panel 33 opens the blocking valve 17 and the remote release valve 36 even if there is no fire signal.

  In addition, as in Japanese Patent Laid-Open No. 10-24119, in a facility in which the sprinkler fire extinguishing equipment and the foam fire extinguishing equipment are combined with one pump, even if the fire detector on the sprinkler fire extinguishing equipment side reports, Control is performed so that the remote opening valve 36 is not opened.

  It should be noted that although only the water is enclosed in the pipes 11 and 27, for example, in cold districts, the water in the secondary side pipes may freeze, so the check is not made on the base end side of the secondary side pipes 27. A valve may be provided, and antifreeze may be sealed on the secondary side of the check valve.

  In the present invention, since a normally closed blocking valve that opens in the event of a fire is provided between the mixer and the stock solution tank, only water flows out from the fire extinguishing head during a non-fire. Therefore, it is possible to prevent the foam extinguishing agent from flowing into the protective compartment when it is not a fire. Normally, only water from the water source is sealed in the primary side pipe and the secondary side pipe so that the aqueous foam solution is not mixed in the pipe. Even if the fire extinguisher head breaks out and breaks, no foam extinguishers will flow out. Therefore, fire extinguishing equipment that is good for the environment can be constructed.

  In addition, a normally open remote release valve that opens for a certain period of time in the event of a fire is provided on the base end side of the secondary pipe, so that the water enclosed in the primary pipe can be drained quickly during normal operation. From the fire extinguishing head, an aqueous foam solution having a fire extinguishing performance higher than water can be quickly discharged as a fire extinguishing agent.

It is a systematic diagram of the fire extinguishing equipment of Embodiment 1 of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Flowing water detector (NS valve), 11 Primary side piping, 14 Mixer, 16 Stock solution tank, 17 Stop valve, 21 Aqueous solution sampling port, 27 Secondary side piping, 28 Fire extinguishing head,
30 Fire detector, 32 Fire receiver, 33 Control panel, 34 Quick drain, 35 Constant flow valve, 36 Remote open valve, tt

Claims (4)

A water flow detector, a primary pipe connected to the primary side of the water flow detector and provided with a water source on the base end side, and a secondary connected to the secondary side of the water flow detector and provided with a fire extinguishing head In fire extinguishing equipment with side piping,
A fire extinguishing system, characterized in that the primary side pipe or the secondary side pipe is provided with a normally closed remote release valve that opens for a certain period of time in the event of a fire to drain water in the pipe. The pipe is equipped with a quick drainage unit consisting of a remote release valve that is opened in the event of a fire and a constant flow valve provided on the primary side of the remote release valve, and drains the water in the pipe to the outside through the drainage pipe. Fire extinguishing equipment characterized by that. A mixer with a water source connected to the base end via a pipe and a stock tank connected to the mixer and storing the foam stock solution, and the pipe is filled with water for monitoring and fire The fire extinguishing equipment according to claim 1 or 2, wherein water filled in the pipe is sometimes replaced with an aqueous foam solution. The fire extinguishing equipment according to claim 3, wherein a blocking valve is provided between the mixer and the stock solution tank so that the foam stock solution does not flow out of the stock solution tank except during a fire.

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