JP2003164542A - Foam fire-extinguishing facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the water loss of a foam fire-extinguishing facility. <P>SOLUTION: A thermosensible opening joint is installed on the secondary side, and two to four opening heads are installed on the secondary side of the thermosensible opening joint. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam fire extinguishing system mainly installed in a parking lot. 2. Description of the Related Art A foam fire extinguishing system comprises a simultaneous opening valve provided for each fire compartment, a plurality of open-type foam heads installed on the secondary side of the simultaneous opening valve, and activation means for the simultaneous opening valve. Fire extinguishing equipment including a plurality of sensing heads or fire detectors. When a fire occurs, a foam extinguishing agent mixed to a predetermined concentration is discharged by a mixer to extinguish a fire, and the fire extinguishing equipment is widely installed mainly for parking lots. [0003] In the event of a fire, the foam extinguishing system opens the simultaneous release valve in response to a fire signal from a fire detector or a sensing head, and foam extinguishing agents are released from all open foam heads installed in the fire compartment. . [0004] By the way, in the conventional foam fire extinguishing equipment, when a fire occurs, as described above, the foam extinguishing agent is radiated to the whole area of the fire protection compartment, so that it is an unnecessary point other than the fire source. Even extinguishing agents are released. [0005] When the fire compartment is a parking lot, the foam which is parked in a place other than the fire source may be sprayed with the foam. At this time, if the foam on the automobile is not thoroughly washed, secondary damage may occur such that the painted surface of the automobile and the foam may cause a chemical change and discolor the painted surface of the automobile. is there. [0006] Further, in the foam fire extinguishing equipment, a simultaneous opening valve must be installed for each fire compartment, and in a fire area, the fire must be radiated to the entire area. There has been a problem that the capacity of the tank and the water storage tank and the discharge amount of the pump increase, resulting in an increase in the cost of the entire equipment. Further, when a sensing head is used as the fire sensing means, a piping system for the sensing head must be installed in addition to the piping system for the foam head, which further increases equipment costs. SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a fire extinguishing system capable of minimizing the amount of radiation of the foam and the accompanying loss and reducing the equipment cost. [0009] The inventor of the present invention has only to install a heat-sensitive opening joint, which is a gate valve for radiating 2 to 4 aqueous foam solutions, between the flowing water detecting device and the foam head. The present invention was completed by paying attention to. The present invention relates to a foam extinguishing system for emitting foam from a foam head when a fire occurs, an open foam head connected to an end of a secondary branch pipe, and a water supply source connected to a primary end. A stock solution tank for supplying foam, a mixer for mixing the chemical and fire-extinguishing water, a pressurized water supply device that pressurizes and sends fire-extinguishing water from the water supply source to the secondary end, and separates the primary and secondary sides A running water detection device that generates a fire alarm when a fire occurs, a gate valve that separates a branch pipe of the open type head from the primary side, and a heat-sensitive release joint that has a heat-sensitive decomposition unit that detects heat of the fire and opens the gate valve. It is a foam fire extinguishing facility characterized by comprising. The radiation area of the fire extinguishing agent can be reduced by making the radiation area of the foam extinguisher small by the heat-sensitive open joint, and radiation to the area other than the fire source is prevented. Further, by using the heat-sensitive open joint of the sensing head, the piping system, which conventionally required two systems of the sensing head and the foam head, can be changed to the open type head only. Next, an embodiment of a foam fire extinguisher according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a foam fire extinguishing system of the present invention. The foam fire extinguishing equipment of the present invention comprises a water supply source 1 connected to a primary end for constantly storing fire extinguishing water, and pressurizing supply means for pressurizing and sending fire extinguishing water from the water supply source to a foam head. A certain pump 2, a stock tank 3 for foam fire extinguishing agent for constantly storing foam fire extinguishing agent, a mixer 4 for mixing foam extinguishing agent and fire extinguishing water to a predetermined concentration, a primary side and a secondary side, A flowing water detection device 5 that generates a fire alarm when it occurs, a gate valve that separates the branch pipe of the open head and the secondary pipe of the flowing water detection device, and a thermal decomposition unit that detects the heat of the fire and opens the gate valve. The structure includes a heat-sensitive open joint 6 having a sensing head 11 and an open-type foam head 7 for emitting a fire extinguishing agent to a predetermined water discharge area when a fire occurs. A primary pipe 8 extends from the water supply source 1 to the flowing water detecting device 5, a secondary piping 9 extends from the flowing water detecting device 5 to the thermal opening joint 6, and a branch pipe 10 extends from the thermal opening joint 6 to the foam head. . The interior of the flowing water detecting device 5 is partitioned into a primary side chamber and a secondary side chamber, and a partition valve is installed at the partitioned opening. The primary side pipe 8 is connected to the primary side chamber. Foam head 7 is installed in the secondary chamber of running water detector 5.
A secondary pipe 9 to which a heat-sensitive release joint 6 for branching off is attached is attached. The thermal release joint 6 is disclosed in Japanese Patent Application No. 2000-35.
7078, Japanese Patent Laid-Open No. 10-108917,
It is widely known in publications such as 154,664 and the like, and is publicly known. The interior of the heat-sensitive release joint 6 is partitioned into a primary side and a secondary side, and a partition valve is installed at the partitioned opening. Sensing head installed on the thermal release joint 6
Numeral 11 has a thermosensitive decomposition section which is decomposed by a fire and opens the gate valve. The primary side of the heat-sensitive opening joint 6 is installed in the secondary side pipe 9 of the flowing water detecting device 5, and the secondary side is connected to the bubble head 7.
Is connected. Here, as the foam head 7, a foam head having a foaming means for foaming a foam for extinguishing a foam with a suction means of air or the like or a screen will be shown as a representative example.
Even if a radiating device having no foaming means is used like a normal sprinkler head, there is essentially no substitute for its effect. With the above configuration, the sensing line of the sensing head, which is required in the conventional foam fire extinguishing equipment, becomes unnecessary by installing the thermal opening joint 6 integrated with the sensing head. Next, the operation of the foam fire extinguishing system of the present invention in the event of a fire will be described. When a fire occurs in the section where the foam fire extinguishing equipment is installed, the heat-sensitive opening joint 6 installed near the fire source detects the fire, and the thermosensitive decomposition portion of the internal sensing head 11 operates. Then, the gate valve of the thermal opening joint 6 is opened, and the foam extinguishing agent filled in the secondary side pipe 9 flows out of the communication opening of the thermal opening joint 6 to the branch pipe 10 and is attached to the tip of the branch pipe 10. Is released from the foam head 7 that is being used. When water flows from the primary side 8 to the secondary side 9, a pressure switch (not shown), which is a delay mechanism of the water flow detecting device 5, is activated, and a fire alarm is generated. The area where the foam is discharged is only the protective section of the foam head 7 connected to the thermal opening joint 6, so that the conventional foam extinguishing equipment has 10 to 12 radiating sections. Since only two to four foam heads need to be radiated, the amount of foam fire extinguishing agent radiated can be reduced to a very small amount. When the fire is not suppressed by the operation of one thermal opening joint, the other thermal opening joint operates and emits a foam, so that the spread of fire can be prevented. Next, a case where the sensing head 11 of the heat-sensitive release joint malfunctions will be described. When the sensing head 11 is activated due to an external impact or the like, the emission of the foam extinguishing agent is limited to only two to four foam heads installed at the end of the thermal opening joint 6 to which the activated sensing head 11 is connected. Can be suppressed. For this reason, unlike the conventional foam extinguishing equipment, the foam extinguishing agent is not radiated to the whole area of one section, so that damage can be minimized. According to the foam extinguishing system of the present invention, when a fire occurs, the fire extinguishing agent can be radiated only to the vicinity of the fire source. Loss can be prevented. In addition, the simultaneous opening valve provided for each fire compartment is not required, and the radiation compartment is reduced, so that the pipe diameter is reduced, and the cost of the entire equipment can be suppressed. Further, by using the heat-sensitive release joint, the sensing line of the sensing head, which is conventionally provided alongside the foam head, becomes unnecessary, and the piping cost and the installation cost can be reduced. As a result, the foam fire-extinguishing equipment of the present invention can provide a foam fire-extinguishing equipment having excellent features such as minimizing the radiation amount of the foam fire-extinguishing agent and the accompanying loss and reducing the equipment cost.

[Brief description of the drawings] FIG. 1 is a system diagram of the foam fire extinguishing equipment of the present invention. [Explanation of symbols] 1 water supply source 2 Pressurized water supply means 3 Foam stock solution tank 4 Mixer 5 Running water detector 6 Thermal opening joint 7 Foam head 8 Primary side piping 9 Secondary side piping 10 Branch pipe 11 Sensing head of thermal opening joint

Claims (1)

Claims: 1. An open foam head connected to an end of a secondary branch pipe and connected to a primary end in a foam fire extinguishing system for emitting foam from a foam head when a fire occurs. A water supply source, a stock solution tank for supplying a foam fire-extinguishing agent, a mixer for mixing the foam and the fire-extinguishing water, A running water detector that separates the primary and secondary sides and generates a fire alarm when a fire occurs, a gate valve that separates the branch pipe of the open head from the primary side, and a thermosensitive decomposition unit that detects the heat of the fire and opens the gate valve A foam fire extinguishing facility characterized by comprising a heat-sensitive opening joint having