JP2003245370A - Powder fire extinguishing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a powder fire extinguishing equipment wherein a required pressure in a powder storage tank can be a pressure being sufficient to feed out a powdery fire extinguishing agent from a powder storage tank to a two- fluid mixing apparatus, and an inexpensive system can be realized because the pressure-resistant grades of the powder storage tank, a discharging valve and a selecting valve can be lowered. <P>SOLUTION: A pressurized gas enters the powder storage tank 1, and when the inside of the powder storage tank 1 is pressurized, the discharging valve 3 is opened by a constant pressure action, and the powdery fire extinguishing agent flows in piping 5, passes through the selecting valve 6, and is emitted from a jetting head 7 for this powder fire extinguishing equipment. In such a powder fire extinguishing equipment, the two-fluid mixing apparatus 9 is provided on the secondary side of the selecting valve 6, and a pressure value of the pressurized gas for mixing which is introduced into the two-fluid mixing device 9 is selected. Thus, a pressure on the primary side is set to be as small as possible based on a specified pressure on the secondary side. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressurized powder fire extinguishing system. 2. Description of the Related Art A conventional general fire extinguishing system of this type will be described with reference to FIG. In FIG. 2, 1 is a powder storage tank, 2 is a pressurized gas container, 3 is a discharge valve, 4 is a constant-pressure actuator, 5 is a pipe, 6 is three selection valves provided on the pipe 5, and 7 is three The jet heads 8 arranged respectively in the protection compartments (not shown) are activation units for activating the pressurized gas container 2 and the selection valve 6. Now, when a fire detector (not shown) detects a fire, a starting gas is emitted from the starting unit 8 and the pressurized gas container 2 is opened, and the pressurized gas enters the powder storage tank 1.
When pressurized, the discharge valve 3 is operated by the constant pressure operation of the constant pressure operation device 4.
Is opened, and the powder extinguisher flows through the pipe 5. Then, the fire extinguishing agent is radiated from the injection head 7 through the selection valve 6 which is opened by a signal from the activation unit 8. [0004] Since this kind of conventional powder fire extinguishing equipment is constructed as described above, an amount of the powder fire extinguishing agent specified by the Fire Service Law is supplied from the injection head 7 in the protective compartment. In order to discharge at a radiation pressure higher than the specified pressure, the piping 5
It is necessary to increase the pressure in the powder storage tank 1 (pressure released from the tank) in consideration of pressure loss and the like.
Therefore, it is necessary to design the powder storage tank 1, the discharge valve 3, and the selection valve 6 to be enough to withstand the high pressure, and there is a problem that an expensive system is required. [0005] The powder fire extinguishing equipment according to the present invention has been made to solve such problems.
By providing a two-fluid mixing device on the secondary side of the selection valve,
The required pressure in the powder storage tank should be sufficient to deliver the required powder fire extinguishing agent from the powder storage tank to the two-fluid mixing device, and lower the pressure resistance grade of the powder storage tank, discharge valve, and selection valve. And an inexpensive system is realized. An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram showing the entire system.
In the figure, the same or corresponding parts as those of the conventional one are denoted by the same reference numerals, and description thereof is omitted. In FIG. 1, reference numeral 9 denotes a two-fluid mixing device provided on the secondary side of each selection valve 6, 10 denotes a pressurized mixing gas container for sending a pressurized mixing gas to each two-fluid mixing device 9, Reference numeral 11 denotes an on-off valve provided in each of the two-fluid mixing devices 9, which is opened by the starting unit 8 in synchronism with the opening of the selection valve 6 and sends the pressurized gas for mixing to the two-fluid mixing device 9. Now, in the two-fluid mixing device 9, a discharge pressure higher than a specified pressure required to discharge the amount of the powder fire extinguishing agent specified by the Fire Service Law is required at the injection head 7 side. After that, the required powder fire extinguishing agent from the powder storage tank 1 is set to the minimum pressure required to be sent out to the two-fluid mixing device 9, and the pressure difference is replenished by pressurizing with the mixing pressurized gas. In this way, the powder extinguishing agent sent from the powder storage tank 1 to the two-fluid mixing device 9 is pressurized by the mixing pressurized gas in the part of the two-fluid mixing device 9 and is sent to the injection head 7 side. It is discharged at a discharge pressure equal to or higher than a required prescribed pressure, and is discharged as it is from the ejection head 7 at a radiation pressure higher than the prescribed pressure. Accordingly, since the pressure between the powder storage tank 1 and the two-fluid mixing device 9 is kept low, the pressure resistance grade of the powder storage tank 1, the discharge valve 3 and the selection valve 6 between them can be kept low. . As described above, according to the present invention, since the two-fluid mixing device is provided on the secondary side of the selection valve, the powder fire extinguishing agent which requires the required pressure in the powder storage tank is used. A pressure sufficient for sending from the storage tank to the two-fluid mixing device is sufficient, and the pressure storage grade of the powder storage tank, the discharge valve and the selection valve can be reduced, and an effect of realizing an inexpensive system can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of an entire system showing an embodiment of the present invention. FIG. 2 is a schematic diagram showing the entire conventional system. [Description of Signs] 1 Powder storage tank 2 Pressurized gas container 3 Release valve 4 Constant pressure operating device 5 Piping 6 Selection valve 7 Injection head 8 Starting unit 9 Two-fluid mixing device 10 Mixing pressurized gas container 11 Opening / closing valve

Claims (1)

Claims 1. A pressurized gas enters a powder storage tank, and when pressurized, a discharge valve opens by a constant pressure operation, and a powder fire extinguisher flows through a pipe and is injected through a selection valve. In the powder fire extinguishing equipment radiated from the head, a two-fluid mixing device is provided on the secondary side of the selection valve, and the specified secondary side is selected by selecting the pressure value of the mixing pressurized gas introduced into the two-fluid mixing device. Powder fire extinguishing equipment characterized in that the primary pressure is set as small as possible with respect to the pressure.