JP3198352B2 - Overflow prevention device for fire extinguishing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire extinguishing liquid overflow prevention device when starting a fire extinguishing system.

[0002]

2. Description of the Related Art In a fire extinguishing system, a fire extinguishing solution pipe is designed to rapidly flow water into the pipe in the event of a fire. It is not normal and complete fire extinguishing performance cannot be obtained.
There is also a risk of accidents caused by water hammer in piping.

[0003] This will be described with reference to the drawings of the apparatus of the present invention. In the foam fire extinguishing equipment of FIG. 1, a valve V is provided in the pipe 1 on the way. Water is always filled from the pump P to the valve V, and the pipes after the valve V are empty. When a fire occurs, the valve V opens and water is rushed to the pipe 1, the foam stock solution is sucked and mixed from the injection pipe 12 on the way, and the foam fire extinguishing liquid is emitted from a nozzle (not shown) at the end of the pipe 1. It has become. However, the diameter of the piping is large near the mixing section of the foam concentrate, and a large amount of liquid passes at a time, and the fire extinguishing ability is reduced due to the poor mixing ratio of the foam concentrate, and various devices provided in the pipe are damaged by a water hammer. Failure to do so may cause a failure. Therefore, conventionally, a differential pressure detecting device that electrically acts on a pipe and an electric valve that is driven by the electric signal are provided to control the flow rate of the pipe to prevent an overflow.

[0004]

In such an apparatus, a control panel having a complicated electric circuit is used to use electricity, and the panel needs to have an explosion-proof structure. There was a disadvantage that the construction period was long.

The present invention has been made in view of the above problems, and has as its object to provide a device which is constituted entirely by mechanical devices and which solves the above-mentioned disadvantages.

[0006]

Means for Solving the Problems (1) In the apparatus of the present invention,
Will be described with reference to FIG. The control valve 7 drives the flow rate of the fire extinguishing liquid supply pipe 1 by the piston device 6 and the control valve 4 drives the valve 5 by a differential pressure generated by the liquid flow of the pipe 1. The piston 6a of the piston device 6
Of the pipe 1 is applied to one side of the
The other side is connected to the valve portion 5a of the control valve 4, and opens the valve 5 of the control valve 4 in accordance with the differential pressure of the fire extinguishing liquid supply liquid flow of the pipe 1, and the liquid on the other side of the piston 6a is discharged. This is a device that discharges from the valve portion 5a of the control valve 4, drives the piston device 6, and controls the control valve 7 to prevent the pipe 1 from flowing over.

The device (2) of the invention (see FIG. 2 of the embodiment)
In the (1) device of the invention, the liquid flow in the pipe 1 is caused to act on one side of the piston 6a of the piston device 6 through the valve portion 5a of the control valve 4, and the difference in the flow of the fire extinguishing liquid supply liquid in the pipe 1 The valve 5a of the control valve 4 is opened according to the pressure, the piston device 6 is driven, and the control valve 7 is controlled to prevent the pipe 1 from flowing excessively.

[0008]

In the apparatus of (1) of the present invention, when a fire occurs, the pump P operates to open the valve V, and water is rapidly sent to the pipe 1. The pipe 1 is provided with an orifice 13,
There is a difference in water pressure before and after the orifice 13. The pressure outlets 2 and 3 are provided before and after the orifice 13, and the pressure water enters the front and rear chambers of the drive unit 4a of the control valve 4 through the conduits 8 and 9, and the differential pressure causes the valve 5 to close the valve unit 5a. Opening, and because of the pressurized water acting on one side of the piston 6, the fluid, eg oil, previously contained on the other side of the piston 6 a passes through the conduit 11
It is discharged from the opened valve portion 5a. The adjustment valve 7 is gradually opened by the movement of the piston 6a to control the liquid flow rate.

In the apparatus (2) of the present invention, the control valve 4 opens the valve 5 by the differential pressure of the water in the pipe 1. When the valve 5 is opened, the pressure water in the pipe 1 is supplied to the valve section 5a by the conduit 10a. Since the pressure water is guided, the pressure water presses one side of the piston 6a through the conduit 11a, and drives the piston 6a to drive the control valve 7
Gradually open to limit the liquid flow.

In any of the devices, when the differential pressure across the orifice increases, the valve 5 closes, the piston device stops, and the control valve also stops. After that, when the liquid is filled in the pipe, the flow rate of the pipe decreases, so that the differential pressure across the orifice decreases, the valve 5 opens, and the control valve opens. , The predetermined flow rate is always maintained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A foam concentrate injection pipe 12 is connected to a pipe 1 at a position behind an orifice 13. An orifice 14 is provided for adjusting the mixing ratio of the foam concentrate.

In the control valve 4, the driving part 4a is a diaphragm and the valve 5 is connected to the shaft 4b. A spring 16 is provided on the back of the shaft 4b by abutting a piston 15, and the valve 5 is always closed.

An opening 20 is provided between the piston 15 and the driving section 4.
It is open and guides the pressure water in the pipe 1 to the piston 15. The spring 17 is a spring for adjusting opening and closing of the valve 5 of the control valve. When the valve V is always closed, the spring 16 overcomes the spring 17 and closes the valve portion 5a of the control valve. Then, the valve V is opened, and a pressure higher than the set pressure acts on the right chamber of the piston 15 from the control valve opening 20, the piston 15 overcomes the spring 16 and moves to the left in the figure, and the valve 5 of the control valve The opening and closing are performed by the balance between the force of the spring 17 and the differential pressure acting on the drive unit 4a.

[0014]

The apparatus according to the present invention controls the excessive flow of the extinguishing liquid which suddenly flows when the fire extinguishing apparatus is started, so that in the foam fire extinguishing equipment, the mixing ratio of the raw foam liquid to the water is made normal and the perfect fire extinguishing performance is obtained. Demonstrate. In addition, it is a device that can be installed safely without damage to piping and other equipment due to the water hammer. Further, the apparatus does not use electricity, has a simple mechanical configuration, and can be provided at a low cost with simple handling.

[Brief description of the drawings]

FIG. 1 is a piping diagram showing an embodiment of an overflow prevention device according to the present invention 1. FIG.

FIG. 2 is a piping diagram showing one embodiment of an overflow prevention device according to Invention 2.

Claims (2)

(57) [Claims] 1. A control valve for driving a valve with a differential pressure generated by a liquid flow in a fire extinguishing liquid supply pipe, and a control valve for driving a flow rate of the pipe by a piston device, and one side of a piston of the piston device. The hydraulic pressure of the pipe is acted on, the other side of the piston is connected to the valve portion of the control valve, the valve of the control valve is opened according to the pressure difference of the fire extinguishing liquid supply liquid flow of the pipe,
An overflow prevention device for a fire extinguishing system, wherein the liquid on the other side of the piston is discharged from a valve portion of the control valve to drive a piston device, and a flow rate of the liquid in the pipe is controlled by a control valve. 2. The control valve and the control valve according to claim 1, wherein a liquid flow of the pipe is made to act on one side of a piston of a piston device through a valve portion of the control valve to supply a fire extinguishing liquid to the pipe. An overflow prevention device for a fire extinguishing system, characterized in that a valve of a control valve is opened according to a differential pressure of a liquid flow, a piston device is driven, and a liquid flow rate of the pipe is controlled by a control valve. Overflow prevention device for fire extinguishing equipment.