JPS6348287Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to improvements in dry and wet foam fire extinguishing equipment used in buildings, parking lots, factories, plant equipment, etc.

Conventionally, foam fire extinguishing equipment is configured as shown in Figure 1. In dry foam fire extinguishing equipment, a dry alarm valve is used as the alarm valve 1, and the secondary side of the alarm valve 1 is connected to the primary side of the simultaneous release valve 3. Also, relatively low pressure pressurized air is enclosed in the conduit leading to the closed sprinkler head 10 for fire detection.

In addition, in the wet foam fire extinguishing system, pressurized water is filled in the conduit from the secondary side of the alarm valve 1 to the primary side of the simultaneous release valve 3 and the closed sprinkler hatch 10.

When the closed sprinkler head 10 opens due to heat in the event of a fire and pressurized air or pressurized water is released from the sprinkler head 10, the simultaneous release valve 3
The valve opens, which allows pressurized air to flow in the dry type, and
In the wet type, when pressurized water is released from the foam head 5 and the secondary pressure of the alarm valve 1 decreases, the alarm valve 1 opens to supply a foam mixture of foam stock solution and water to the foam head 5 and release foam. Notify.

By the way, in such foam fire extinguishing equipment, since a foam release test is performed at the time of completion or periodic inspection, some of the foam mixture remains in the piping after the test is completed.

This remaining foam mixture solidifies over time and adheres to the pipe wall, or provides appropriate humidity within the pipe to promote a reaction between the pipe and air, thereby gradually corroding the pipe. The products produced in this manner are produced not only in the dry method but also in the wet method, but are particularly noticeable in the dry method where the pipes exposed to the air are long.

During a test or in the event of a fire, when the simultaneous release valve 3 opens and pressurized air or pressurized water flows out, this pressurized air (flow rate of several tens to several
100 m/sec) or stripped from the pipe wall and transported by pressurized water (flow velocity of several to 10 m/sec).
When it reaches the foam head, it becomes clogged, inhibiting foam generation, reducing the amount of foaming, and causing irregularities in the discharged shape.

In view of the above, the purpose of this invention is to prevent the foam head of a foam fire extinguishing system from becoming clogged with corrosion products generated in the piping.

In this invention, a product collector is provided at the tip of the straight pipe section of the secondary pipe line of the simultaneous release valve, and the product in the pipe line is collected by this collector.

This invention regarding dry foam fire extinguishing equipment is shown in Figures 2 and 3.
To explain based on the figure, 1 is a dry alarm valve, 2 is a main pipe, 3a, 3b are simultaneous release valves, 4a, 4b are branch pipes, 4c, 4d, 4e, 4f are straight pipe parts, 5
6 is a foam head, 6 is a product collector, 7 is an air relief valve, 8 is a discharge valve, 9 is a sprinkler line, and 10 is a closed sprinkler head.

In this dry foam fire extinguishing equipment, when the closed type sprinkler head 10 is operated and opened due to a test or a fire, the pressurized air in the sprinkler pipe 9 is released and the open valve 3a is opened all at once, and the primary side of the open valve 3a is opened. Pressurized air flows out to the secondary side of the open valve 3a at a speed of several tens to several hundreds of meters/sec.

Due to this outflowing air flow, the products 4S that have been solidified or deposited in the main pipe 2 and the branch pipe 4a due to solidification or corrosion are peeled off and carried to the collector 6 along with the air flow as shown in FIG. In the collector 6, pressurized air escapes to the outside through the air relief valve 7 and only the product 4S is collected. Then, when the air pressure in the main pipe 2 decreases, the alarm valve 1 opens and a foam mixture of the foam concentrate and water is supplied, and this mixture is supplied to the foam head 5 and the collector 6. The liquid generates and releases bubbles.

Further, in the collector 6, the air release valve 7 is closed by the foam mixture that has flowed in, thereby preventing leakage of the foam mixture.

After the test is finished or after the fire is extinguished, the supply of the foam mixture is first stopped, and the discharge valve 8 is opened to inject water into the collector 6 from the main pipe 2 or the branch pipe 4a.
The collected products are discharged from the discharge valve 6, and the inside of the collector 6 is cleaned.

The product collector 6 may be installed at either the tips of the straight pipe sections 4c, 4e or the tips of the straight pipe sections 4d, 4f, or the simultaneous release valves 3a, 3b.
The gas to be sealed in the secondary side of ... and in the sprinkler pipe line 9 may be a nonflammable gas such as nitrogen gas other than pressurized air. Although not shown,
In wet foam fire extinguishing equipment, the products deposited on the pipes are peeled off by a stream of pressurized water and transported to the product collector 6, and then treated in the same manner as in dry foam fire extinguishing equipment. Note that the primary side of the simultaneous release valve 3 and the sprinkler head pipe line 9 may be filled with a pressurized foam mixture other than pressurized water.

In this invention, a product collector is installed at the tip of the straight pipe section of the secondary pipe line of the simultaneous release valve, so products such as solids and corrosive substances generated in the pipe do not flow to the foam head. , all flow straight toward the collector, preventing clogging of the foam head by products. Moreover, since the present invention has the above-mentioned configuration,
When implementing the present invention by modifying existing foam fire extinguishing equipment, it is easy to implement the present invention because it is only necessary to install a product collector at the tip of the straight pipe section of the secondary pipe provided in each foam discharge section of the equipment. can be implemented.

[Brief explanation of the drawing]

FIG. 1 is a piping system diagram of a conventional example, FIG. 2 is a piping system diagram of an embodiment of the present invention, and FIG. 3 is an enlarged sectional view of the main part of FIG. 3... Simultaneous release valve, 4c, 4f... Straight pipe section, 5
... foam head, 6 ... product collector, 7 ... air relief valve, 8 ... discharge valve.

Claims (1)

[Claims for Utility Model Registration] 1. Pressurized fluid is supplied to the primary side, and a pipe line leading to the foam head 5 is connected to the secondary side, and the valve is opened under the control of a heat-sensitive device to supply the pressurized fluid to the secondary side. An air release valve 7 is installed at the tip of the straight pipe portions 4c and 4f of the pipe connected to the secondary side of the simultaneous release valve 3 that flows out to the side.
and a product collector 6 with a discharge valve 8 for product discharge. 2. The foam fire extinguishing equipment according to claim 1, wherein the pressurized fluid is pressurized air. 3. The foam fire extinguishing equipment according to claim 1, wherein the pressurized fluid is a pressurized liquid.