JP2007054142A - Inspection device of closed type foam extinguishing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inspection device of closed type foam extinguishing equipment capable of easily and efficiently inspecting the foaming performance and mixing rate, etc., of a foam extinguishing chemical in a short time by a small number of people. <P>SOLUTION: A foam extinguishing chemical inspection unit 35 is provided on the secondary side of a mixing device in the closed type foam extinguishing equipment. The foam extinguishing chemical inspection unit 35 comprises: a branching port 36 branched and connected to the middle of a water supply main pipe 12 for taking out a foam solution from the water supply main pipe 12; an orifice 37 for reducing the pressure of the foam solution taken out to the branching port; a valve 38 for regulating the discharge amount of the foam solution on the downstream side of the orifice; a pressure gauge 39 for measuring a discharge pressure; a foam head 41 attached to the discharge port of the valve 38 for which a water discharge port is opened without being provided with a thermosensitive decomposition part; a foam scattering prevention cover 42 for preventing the scattering of foam discharged from the foam head; and a foam gathering container for collecting the foam discharged from the foam head 41. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a foam extinguishing agent inspection device for a closed-type foam extinguishing facility.

  Conventionally, as a closed-type foam fire extinguishing equipment, a pressurized water supply apparatus that pressurizes and supplies fire extinguishing water to a water supply main, and is installed in the middle of the water supply main. Is installed in the middle of the water supply branch branchedly connected to the water supply main pipe, and when the foam aqueous solution from the mixing apparatus flows into the water supply branch, the flow of the foam aqueous solution is detected. And a closed-type foam head equipped with a thermal decomposition part that is attached to a branch pipe branched from the secondary side of the water flow detection device and decomposes by heat in the event of a fire to open the water outlet. Some are provided (see, for example, Patent Document 1).

  In this type of closed-type foam fire extinguishing equipment, in order to check the foam expansion ratio of the water film-forming foam and 25% reduction time, one of the closed-type foam heads already installed in the branch pipe After removing the thermal decomposition part and replacing the foam head with the water outlet opened, the pump was activated to release the foam from the foam head, and the foam sample collector installed diagonally below the foam head The bubbles that flowed down after falling into a measuring cylinder were collected in a measuring cylinder, and the foaming ratio, 25% reduction time, mixing concentration performance of the mixing device, and the like were measured.

Foaming ratio is a measure of the ratio of the final foam volume to the original foam aqueous solution volume before aeration. The internal volume is 1,000 ml and the weight of a graduated graduated cylinder is measured in advance. Measure up to and calculate according to the following formula.
Foaming ratio = 1,000 ml / total weight excluding graduated cylinder weight (g)

The 25% reduction time of foam is the time required to reduce the amount of aqueous foam solution reduced from the collected foam to 25% of the total amount of aqueous foam contained in the foam in the graduated cylinder, expressed in minutes and seconds. Measure by the following method.
The measurement is performed with a sample for measuring the expansion ratio, and the net weight of the foam sample is divided into four equal parts to obtain a 25% volume (unit: ml) of the foam aqueous solution contained in the foam. In order to know the time required for this amount to be reduced, place the graduated cylinder on a flat table and use a measuring line that makes it easy to separate the liquid that accumulates at the bottom of the graduated cylinder from bubbles within a certain period of time. taking measurement.
An example of the measurement is as follows.
Now, if the net weight of the foam sample is 200 grams, 1 gram is converted to 1 ml,
25% capacity value = 200 ml / 4 = 50 ml
The time to become 50 (ml) is measured.

  The mixing concentration performance of the mixing device is confirmed by comparing the refractive index measured in advance with 1 to 5% water film foam extinguishing agent and the measured refractive index of the foam aqueous solution released at the time of inspection. To do.

JP 2001-573 A

  However, in the above inspection method, one of the closed-type foam heads already installed in the branch pipe in a certain fire prevention area is replaced with a foam head that has been opened by removing the thermal decomposition part. Since it is necessary to reattach the closed foam head, it takes a lot of time and labor for setting and recovery work until the start of inspection, and a lot of workers are required, and piping from the mixing device to the foam head Since the process is long, it takes a long time from the start of the pump to the release of the foam, a large amount of foam fire extinguishing agent is required, and there is a problem that a lot of work is required for the post-treatment after the inspection by scattering of the radiation foam.

  The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to easily and easily check the foam extinguishing ratio, 25% reduction time, mixing concentration performance of the mixing apparatus, etc. An object of the present invention is to provide an inspection apparatus for a closed-type foam fire extinguishing system that can be efficiently performed in a short time.

  The present invention includes a pressurized water supply device that pressurizes and supplies fire-extinguishing water to the water supply main, and is installed in the middle of the water supply main, and the fire-extinguishing water from the pressurized water supply device and the foam stock solution are mixed in a predetermined ratio. And a flowing water detection device that is installed in the middle of the water supply branch branchedly connected to the water supply main pipe and detects the flow of the foam aqueous solution when the foam aqueous solution flows from the mixing device in the water supply branch. A closed-type foam head, which is attached to a branch pipe branched from the secondary side of the flowing water detection device, and has a thermal-sensitive decomposition section that is decomposed by heat at the time of a fire to open a water outlet. In a fire extinguishing facility, a foam extinguishing agent inspection unit that takes out and discharges the foam aqueous solution from the mixing device to a secondary side of the mixing device from the middle part of the water supply main, and collects and inspects the released foam aqueous solution. It is characterized by having It is intended.

As one suitable aspect, the inspection apparatus of the closed-type foam fire extinguishing equipment by this invention can provide the said foam fire extinguishing agent inspection unit between the said mixing apparatus and a flowing water detection apparatus.
The foam fire-extinguishing agent check unit includes a branch port that is branched and connected in the middle of the water supply main, and an orifice that reduces the pressure of the foam aqueous solution extracted from the branch port. A valve that regulates the amount of foam aqueous solution released downstream, a pressure gauge that measures the discharge pressure, a foam head that is attached to the discharge part of the valve and does not have a thermal decomposition part and has a water outlet, and is released from this foam head. A foam scattering prevention cover for preventing the foam from scattering, and a foam collecting container for collecting the foam released from the foam head.

  According to the inspection apparatus for a closed-type foam fire extinguishing apparatus of the present invention, since the foam fire-extinguishing agent inspection unit is provided on the secondary side of the mixing device, the inside of a certain fire prevention area as in the conventional foam extinguishing agent inspection operation described above. One of the closed foam heads already installed in the branch pipe is replaced with a foam head that has been opened by removing the thermal decomposition part, and after inspection, the troublesome task of reattaching the closed foam head is omitted. It was possible to reduce the time and labor required for the setting work and the recovery until the start of the inspection, and the number of workers, and the foam fire extinguishing agent could be easily and efficiently checked in a short time, and with a small number of people.

  If a foam extinguishing agent inspection unit is installed between the mixing device and the flowing water detection device, the piping process from the mixing device to the foam extinguishing agent inspection unit will be shortened, so the time until the foam aqueous solution is released during the inspection will be shortened. This shortens the inspection time and reduces the amount of foam used during inspection.

  The foam extinguishing agent inspection unit is branched and connected in the middle of the water main, a branch port for taking out the aqueous foam solution from the water main, an orifice for reducing the pressure of the aqueous foam solution taken out to the branch port, and a downstream side of the orifice. A valve that regulates the amount of foam aqueous solution released, a pressure gauge that measures the discharge pressure, a foam head that is attached to the valve's discharge part and does not have a thermal decomposition part, and that opens the water outlet. It is possible to easily and reliably measure the foaming performance of foam aqueous solution and the mixing ratio of foam extinguishing agent by providing a foam collection prevention cover that prevents foam scattering and a foam collection container that collects foam released from the foam head. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an inspection apparatus for closed-type foam fire extinguishing equipment according to the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration diagram of a closed-type foam fire extinguishing system, FIG. 2 is a longitudinal front view showing an example of a closed-type foam head used in the closed-type foam fire-extinguishing equipment in a closed state, and FIG. FIG. 4 is a plan view of the bubble extinguishing agent inspection unit, FIG. 5 is a side view of the bubble extinguishing agent inspection unit, and FIG. 6 is an internal front view of the bubble extinguishing agent inspection unit in a normal state. 7 is an internal front view at the time of inspection of the foam extinguishing agent inspection unit.

  The closed-type foam fire-extinguishing equipment according to the present invention is a closed-type foam fire-extinguishing equipment in which a large number of closed-type foam heads 1 are installed in a fire prevention area A such as a self-propelled parking lot as shown in FIG. This closed-type foam fire extinguishing equipment itself is publicly known, and includes a water storage tank 3 for storing fire-extinguishing water, a pressurized water supply device 4, a foam stock solution tank 5, a mixing device 6, a flowing water detection device (automatic alarm valve) 7, a fire extinguisher. A pump control panel 8, a fire extinguishing system control panel (fire receiver) 9 and the like are provided.

  In FIG. 1, the pressurized water supply device 4 includes a water pump 10 and a motor 11 that drives the water pump 10. The water pump 10 sucks fire water from the water storage tank 3, pressurizes the sucked fire water, and supplies the water main 12. To pump. The motor 11 of the water pump 10 is started and stopped by the fire extinguishing pump control panel 8. A priming tank 13 is installed at a predetermined height near the water pump 10, and a priming water supply pipe 14 is connected from the priming tank 13 to the discharge side of the water pump 10. The expelling tank 13 is provided with a water level sensor 15, and a water level detection signal from the water level sensor 15 is applied to the fire extinguishing pump control panel 8, so that the fire extinguishing pump control panel 8 generates a full water alarm (upper limit alarm) and a water decrease alarm (lower limit alarm). It is configured to output.

  The fire pump control panel 8 is connected to a fire extinguishing system control panel (fire receiver) 9 so as to receive a running water detection signal from the running water detection device 7 and send an activation signal to the pressurized water feeding device 4.

  In the piping system from the pressurized water supply device 4 to the primary side of the flowing water detection device 7, the foamed aqueous solution is prepared by mixing the pressure-extinguishing water from the pressurized water supply device 4 and the foam stock solution from the foam stock solution tank 5 at a predetermined ratio. The mixing device 6 such as a pressure proportioner system is installed. The mixing device 6 is configured such that a mixer 27 is installed in a piping system from the pressurized water supply device 4 to the primary side of the flowing water detection device 7 so that the aqueous foam solution flows through the mixer 27 at all times.

  A water supply branch pipe 16 is branched and connected from the middle of the water supply main pipe 12, and when the foam aqueous solution from the mixing device 6 flows into the water supply branch pipe 16, the flow of the foam aqueous solution is detected. A running water detection device 7 for issuing a fire alarm is connected. On the secondary side of the flowing water detection device 7, a branch pipe 17 connected to the fire prevention area A where the closed type foam head 1 is installed is branched and connected.

  Downward and upward closed type foam heads 1 are attached to the branch pipe 17, and each closed type foam head 1 is, for example, disclosed in JP 2001-573A, JP 2001-340481, JP 2001-46543, JP-A-7-31691 and the like are described here, and only one example will be described here. For example, the closed-type foam head 1 shown in FIG. 2 includes a foam head main body 20 having a connection port 18 and a water discharge port 19 connected to the branch pipe 17, a valve 21 for closing the water discharge port 19, and a valve 21 in a normal state. A foam head main body 20 which is pressed against the water discharge port 19 and decomposes or dissolves by heat at the time of a fire to release the state of pressing against the valve to open the water discharge port 19 and is composed of a glass valve or a fusible link. The support frame 24 is integrally formed to form an upper opening 23 that surrounds the water outlet 19 and takes in air when the foam aqueous solution is discharged from the water outlet 19, and supports the thermal decomposition part 22. And a deflector 25 that is supported in a hanging manner at the bottom of the support frame 24 and diffuses the foam aqueous solution discharged from the water outlet 19.

  In the normal state, the pressurized foam aqueous solution filled up to the inside of the connection port 18 of the foam head main body 20 is blocked by the valve 21. Therefore, when a fire occurs and the heat of the fire reaches a certain temperature or more, the thermal decomposition unit 22 is decomposed or dissolved by the fire heat, and the pressing state against the valve 21 is released. With this release, the valve 21 is pushed forward from the water outlet 19 by the pressure of the aqueous foam solution, and the water outlet 19 is fully opened. The foam aqueous solution discharged from the opened water discharge port 19 takes in air from the upper open port 23, foams, collides with the deflector 25, and is uniformly dispersed and diffused around.

  When a fire occurs in the fire prevention area A where the closed foam head 1 is installed, the above foam fire extinguishing equipment heats the closed foam head 1 in the vicinity of the fire position and releases the aqueous foam solution. An activation signal is sent to the pressure water supply device 4, the pressure water supply device 4 is activated, and the foam aqueous solution flows from the mixer 27 to the closed type foam head 1 through the flowing water detection device 7.

  A gate valve 32 is provided in the middle of the water supply main pipe 12 between the primary side of the mixing device 6 and the pressurized water supply device 4, and a pressure air tank 33 is branched and connected to the secondary side of the gate valve 32. The internal pressure of the water supply main pipe 12 is always maintained at a constant pressure. When a fire occurs in the fire prevention area A where the closed type foam head 1 is installed, the closed type foam head 1 in the vicinity of the fire position senses heat and releases the aqueous foam solution, so that the pressure in the water supply main pipe 12 and the water supply branch pipe 16 is increased. The pressure switch 34 provided in the pressurized air tank 33 detects this pressure drop. A detection signal from the pressure switch 34 is sent to the fire pump control panel 8, and the fire pump control panel 8 activates the pressurized water supply device 4.

  In the above closed-type foam fire extinguishing equipment, as shown in FIG. In addition, the foam aqueous solution from the mixing device 6 is taken out from the middle portion of the water supply main pipe 12 and discharged, and the discharged foam aqueous solution is collected to obtain the expansion ratio, 25% reduction time, the mixing concentration performance of the mixing device 6 and the like. It is characterized by providing a foam extinguishing agent inspection unit 35 for inspection.

  Specifically, as shown in FIGS. 3 to 7, the foam fire-extinguishing agent checking unit 35 is branched and connected in the middle of the water supply main pipe 12 to take out the aqueous foam solution from the mixing device 6 from the water supply main pipe 12. , An orifice 37 for reducing the pressure of the foam aqueous solution taken out to the branch port 36, a valve 38 for regulating the discharge amount of the foam aqueous solution downstream of the orifice 37, a pressure gauge 39 for measuring the discharge pressure, and a discharge portion of the valve 38 40, a foam head 41 which is not provided with a thermal decomposition part and has a water outlet, a foam splash prevention cover 42 which prevents the foam head 41 from scattering, and a foam which is emitted from the foam head 41 are collected. A bubble collecting container (not shown) such as a graduated graduated cylinder is provided.

  As shown in FIGS. 6 and 7, the branch port 36 for taking out the aqueous foam solution from the middle portion of the water supply main pipe 12 is connected to the middle of the water supply main pipe 12 on the secondary side of the mixing device 6 via a flange 44. It is provided at an intermediate portion of the horizontal pipe portion 45. A manually open / close valve 38 that regulates the amount of foam aqueous solution discharged to the branch port 36 is attached to the branch port 36. Normally, as shown in FIG. During plugging and inspection, the plug 46 is removed, and the foam head 41 is screwed into the discharge portion 40 as shown in FIG. The foam head 41 is not provided with a thermal decomposition part, and the water outlet is opened. At the time of inspection, since radiation is emitted from only one foam head 41, the pressure is reduced between the branch port 36 and the valve 38 so that it is within the foam head radiation pressure range (0.35 to 0.60 MPa). Orifice 37 is incorporated. A pressure gauge 39 for measuring the discharge pressure is attached to the valve 38.

  As shown in FIGS. 3 to 6, the foam extinguishing agent inspection unit 35 is an inspection box comprising a box main body 47 that is open at the front and lower sides, and a cover 48 that closes the front and lower sides of the box main body 47. 49. The box body 47 is attached to the horizontal pipe portion 45 with a band 50 and a bolt 51. In the inspection box 49, the cover 48 is normally fastened and fixed to the box main body 47 with special screws 52 and bolts 53 so that the internal foam extinguishing agent inspection unit 35 is not accidentally touched from the outside. The special screws 52 and bolts 53 are loosened to remove the cover 48 so that the box body 47 can be opened. As shown in FIG. 6, the foam scattering prevention cover 42 is suspended from a horizontal pipe portion 45 by a fastening member 54 such as a chain or a hook in a check box 49 as shown in FIG. 45, and the fastening member 54 is wound around the valve 38 as shown in FIG. 7, so that the outer periphery of the discharge portion 40 of the valve 38 is securely connected.

Next, an example of a procedure for using the foam extinguishing agent inspection unit 35 will be described.
First, the cover 48 of the inspection box 49 is removed. Next, after confirming that the valve 38 is closed, the plug 46 of the valve 38 is removed, and the foam head 41 is screwed into the discharge part 40 of the valve 38 as shown in FIG. Next, the fastening member 54 of the foam scattering prevention cover 42 is removed from the horizontal pipe portion 45, and the fastening member 54 is wound around the valve 38 as shown in FIG.
Then, after starting the water pump 10, the valve 38 is opened until the pressure reaches a predetermined pressure while looking at the pressure gauge 39, and the foamed foam discharged from the foam scattering prevention cover 42 is removed from the foam collection container (internal volume 1, 000 ml, graduated measuring cylinder). After collecting the bubbles, the valve 38 is closed and the water pump 10 is stopped. The method for measuring and inspecting the foam expansion ratio, the 25% reduction time of the collected bubbles, and the mixed concentration performance of the mixing device 6 is the same as the method described above (see the description of [0003] to [0005]).
After the inspection is completed, the foam scattering prevention cover 42 and the foam head 41 are removed from the valve 38, and the plug 46 is screwed into the discharge portion 40 of the valve 38 as shown in FIG. In a state where the foam head 41 is still attached to the valve 38, the foam head 41 interferes with the attachment of the cover 48 so that the cover 48 cannot be attached. As shown in FIG. 6, the bubble scattering prevention cover 42 is suspended from the horizontal pipe portion 45 by a fastening member 54.
Finally, as shown in FIGS. 3 to 5, after covering the cover 48, the box body 47 is fastened and fixed with a special screw 52 or a bolt 53, and the process ends.

  The foam extinguishing agent checking unit 35 may be provided in the middle of the water supply main pipe 12 on the secondary side of the mixing device 6, but instead, the secondary side of the mixing device 6 is normally used. It is also possible to provide only the branch port 36 in the middle of the water supply main pipe 12 and connect the foam extinguishing agent inspection unit 35 to the branch port 36 at the time of inspection.

It is a block diagram of the closed-type foam fire extinguishing equipment which shows one Example of this invention. It is a vertical front view which shows an example of the closed type foam head used for the closed type foam fire-extinguishing equipment in a closed state. It is a front view of the foam fire extinguishing agent check unit of the closed type foam fire extinguishing equipment. It is a top view of the foam extinguishing agent inspection unit. It is a side view of the foam extinguishing agent inspection unit. It is an internal front view in the normal time of the foam extinguishing agent inspection unit. It is an internal front view at the time of the inspection of the foam extinguishing agent inspection unit.

Explanation of symbols

1 Closed-type foam head 4 Pressurized water supply device 6 Mixing device 7 Flowing water detection device (automatic alarm valve)
DESCRIPTION OF SYMBOLS 12 Water supply main pipe 16 Water supply branch pipe 17 Branch pipe 22 Thermal decomposition part 35 Foam extinguishing agent check unit 36 Branch opening 37 Orifice 38 Valve 39 Pressure gauge 41 Foam head 42 Foam scattering prevention cover

Claims (3)

A pressurized water feeding device that pressurizes and feeds the fire-extinguishing water to the water supply main, and a mixing device that is installed in the middle of the water feeding main and mixes the fire-extinguishing water from the pressurized water feeding device and the foam stock solution in a predetermined ratio; A flowing water detection device installed in the middle of a water supply branch branchedly connected to the water supply main pipe, and detecting the flow of the foam aqueous solution when the foam aqueous solution flows from the mixing device in the water supply branch; and the flow detection In a closed-type foam fire extinguisher equipped with a closed-type foam head, which is attached to a branch pipe branched from the secondary side of the device, and has a thermal-sensitive decomposition section that is decomposed by heat at the time of a fire to open a water outlet,
A foam fire extinguishing agent inspection unit is provided on the secondary side of the mixing apparatus to take out and discharge the foam aqueous solution from the mixing apparatus from the middle part of the water supply main, and collect and inspect the discharged foam aqueous solution. An inspection device for a closed-type foam fire extinguishing system, characterized in that.   The closed-type foam fire extinguishing equipment inspection apparatus according to claim 1, wherein the foam fire-extinguishing chemical inspection unit is provided between the mixing device and the flowing water detection device. The foam extinguishing agent inspection unit is branched and connected in the middle of the water supply main, a branch port for taking out the foam aqueous solution from the water supply main, an orifice for reducing the pressure of the foam aqueous solution taken out to the branch port, and a downstream of the orifice A valve that regulates the amount of foam aqueous solution released on the side, a pressure gauge that measures the discharge pressure, a foam head that is attached to the discharge part of the valve and does not have a thermal decomposition part, and that opens the water outlet, foam released from this foam head The inspection apparatus of the closed-type foam fire-extinguishing apparatus of Claim 1 or 2 provided with the foam collection container which extract | collects the foam | spatter scattering prevention cover which prevents dispersion | spreading, and the foam discharge | released from the said foam head.

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