KR20030033233A - form proportioning system - Google Patents

Abstract

The present invention relates to a foam liquid injection system of a fire truck, comprising: a water tank (21) containing water, a foam tank (22) containing foam liquid, a pump (23) for pumping a mixed liquid of water or foam liquid, and the pump Water discharged to the waterproof port 24 side in the foam liquid injection system including a waterproof port 24 for injecting a mixture of water or foam liquid supplied by 23 and a chemical liquid mixing device 25 for mixing water and foam liquid / A chemical liquid operation valve 24a installed in the foam liquid supply line 23a to lower the pressure in the line 23a; A pressure sensor 29 for detecting a pressure difference between the water / foam liquid supply line 23a; An automatic water supply valve 28 for opening and closing a flow path of the water supply line 25 for supplying water to the chemical liquid mixing device 25; A foam automatic main valve 27 for opening and closing the flow path of the foam liquid supply line 22a for supplying the foam liquid to the chemical liquid mixing device 25; Water / foam liquid supply line by including a control unit 30 for mixing the water and foam liquid by opening and closing the automatic water supply valve 28 and the foam automatic main valve 27 in response to the signal detected by the pressure sensor 29 By opening and closing the flow path of the water supply line and the foam liquid supply line by using the difference in the internal waterproof pressure of the water pipe, there is an effect that can easily manipulate the foam liquid spray directly while eliminating the disadvantage of the foam liquid spray system by wire or wireless.

Description

Form proportioning system

The present invention relates to a spraying system for a fire fighting foam liquid, and more particularly, by generating a pressure difference in a discharge line connected to a waterproof port and opening and closing the foam liquid supply line using the pressure difference to perform foam liquid spraying. The present invention relates to a foam liquid ejecting system for easily performing a foam liquid ejecting operation.

In general, a fire truck is a command vehicle that leads the entire fire brigade's activities at an accident site, a pump car for extinguishing a fire in the event of a fire, a tank car supplying water to a pump car, and a fire brigade to enter a large high-rise building. It is divided into a ladder truck to rescue lives, a rescue truck equipped with various safety tools required for lifesaving, a chemical fire truck, and the like.

Among these, chemical fire engines are mainly used when water or simple chemicals cannot be extinguished. Water tanks, foam tanks, and water pumps are installed, and foam tanks and water tanks are connected to the foam pump and water to the water pump. It is configured to be supplied, and the foam liquid and water supplied to the water pump are discharged to the foam drain through the foam waterproof line while being properly mixed.

An example of such a water / foam liquid system will be described with reference to FIG. 1, a water tank 1, a water pump 2 connected to the water tank 1 to pump water into a pump discharge line 3, and The water discharge port is connected to the pump discharge line (3) by the water waterproof line (5) and the water control valve (4) is installed so that the water pumped by the water pump (2) is injected when the water control valve (4) is opened. (6), and the pump discharge line (3) is connected to one end and the foam waterproofing line (7) is connected to the other end and opened when the water waterproofing line (5) is closed to open water or foam liquid in the pump discharge line (3). Foam proportional inlet 11 with automatic proportional valve 15 leading to the foam waterproofing line 7, foam waterproofing port 8 connected to the foam waterproofing line 7, and sprayed with foam liquid, and foam liquid valve 10. In the pressure tank (13) connected to the automatic proportional valve (15) by the form, and the automatic proportional valve (15) by the foam pipe 12, the water supply valve (13a) is installed A foam mixer 16 connected to the sea water pump 2 and a foam liquid mixed between the foam mixer 16 and the water pump 2 and mixed with water in the foam mixer 16 are supplied to the water pump 2. It is composed of a foam mixture liquid discharge line 14 to be supplied to.

However, the water / foam liquid injection system configured as described above has the effect of mixing the mixing amount of the water and the foam liquid at a constant ratio, but in order to perform the foam liquid injection, more personnel are required to operate the foam liquid valve other than the fire extinguisher for the first time. There is a problem done.

In addition, in order to solve this problem, a method of operating the foam liquid valve by wire or wireless has been proposed, but in the case of a wired line, it is cumbersome for the worker to move the work position remotely and there is a risk of disconnection. There are various problems, such as malfunctioning in a basement where it is far away or the signal does not reach.

On the other hand, since the foam liquid spraying operation includes chemicals, it is possible to contaminate the extinguishing work environment by the extinguishing water, so the work must be carried out selectively. have.

The object of the present invention devised in view of such a problem is to make it possible to selectively operate the water spray and foam liquid spray by a single mandatory water.

Another object of the present invention is to accurately perform the operation of the foam liquid injection even if the work position of the water pipe is far from the fire truck.

Still another object of the present invention is to improve the efficiency of firefighting operations because the operation of the foam liquid injection can be performed quickly.

1 is a circuit diagram of a foam liquid injection system according to the prior art.

2 is a circuit diagram of a foam liquid injection system according to the present invention.

3 is a block diagram of a control unit applied to the present invention.

(Explanation of symbols for the main parts of the drawing)

21; Water tank 22; Foam tank

22a; Foam liquid supply line 23; Pump

23a; Water / foam liquid supply line 23b; Water supply line

23c; Bypass line 24; Waterproof

25; Chemical liquid mixing apparatus 25a; Mixed Liquid Supply Line

26; Relief valve 27; Foam Automatic Main Valve

28; Automatic water valve 29; Pressure sensor

30; Control unit 31; Amplification circuit

32; Binary counter 33; Relay

The present invention for achieving the above object is a water tank containing water, a foam tank containing the foam liquid, a pump for pumping a mixed liquid of water or foam liquid, and spraying the mixed liquid of water or foam liquid supplied by the pump A foam liquid dispensing system having a waterproof port and a chemical liquid mixing device for mixing water and foam liquid, comprising: a chemical liquid operation valve installed at a water / foam liquid supply line connecting the pump and the waterproof port to lower pressure in the line, and the water / foam liquid Open and close the flow path of the pressure sensor for detecting the pressure difference in the supply line, the automatic water supply valve for opening and closing the flow path of the water supply line for supplying water to the chemical liquid mixing device, and the foam liquid supply line for supplying the foam liquid to the chemical liquid mixing device. And a control unit for opening and closing the automatic water supply valve and the automatic form main valve based on the signal detected by the pressure sensor. To configure.

The control unit comprises an amplifying circuit, a binary counter for counting the signal amplified by the amplification circuit, and an electromagnetic relay for opening and closing the form automatic main valve and the automatic water supply valve by operating a relay by the signal counted in the binary counter. desirable.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

In an embodiment of the present invention, the water tank 21 and the foam tank 22 as shown in FIG. 2 are connected to the pump 23 by the water supply line 21a and the foam liquid supply line 22a, The pump 23 is connected to a waterproof port 24 such as a pipe window or a water spray by a water / foam liquid supply line 23a.

The chemical liquid mixing device 25 is installed on the foam liquid supply line 22a, and the chemical liquid mixing device 25 is connected to the water supply line 23b connected to the pump 23 so that the foam liquid supplied from the foam liquid supply line 22a is provided. And water supplied from the water supply line 23b is mixed so that the mixed liquid supply line 25a flows into the pump 23 side, and the water / foam liquid supply line 23a is bypassed to the mixed liquid supply line 25a. Bypass line 23c is connected and installed as much as possible. The relief valve 26 is provided in the bypass line 23c.

A foam automatic main valve 27 is installed in the foam liquid supply line 22a, and an automatic water supply valve 28 is installed in the water supply line 23b to open and close the flow path on each line.

The pressure sensor 29 is installed in the water / foam liquid supply line 23a connected to the waterproof port 24, and the pressure sensor 29 is connected to the controller 30, and the controller 30 is a foam automatic main valve ( 27) and automatic water supply valve (28).

As shown in FIG. 3, the controller 30 includes an amplifying circuit 31 to which a voltage output from the pressure sensor 29 is input, and a binary counter 32 counting a signal amplified by the amplifying circuit 31. And an electromagnetic relay 33 for opening and closing the form automatic main valve 27 and the automatic water supply valve 28 by operating the relays 41 and 42 according to the signal counted by the binary counter 32. .

The water / foam liquid supply line 23a flowing into the waterproof port 24 is provided with a chemical liquid operation valve 24a for adjusting the pressure of the water / foam liquid supply line 23a, and the check valve in the foam liquid supply line 22a. In check valve 22b is provided. The chemical liquid actuating valve 24a is preferably installed at a position convenient to operate the water port 24 or the water pipe 24 adjacent to the water port 24.

The present invention constituted as described above is water-proofing port or water spray through the water / foam liquid supply line (23a) by the pump 23 to the water supplied through the water supply line (21a) of the water tank 21 during the water spray Sprayed through 24. At this time, the pressure in the water / foam liquid supply line (23a) is at least 80bar to a maximum of 120bar.

The controller 30 sets the binary counter 32 by the initial set signal so that the output + Q is generated as a high voltage. In this case, the electromagnetic relay 33 is not driven so that the switches 41 and 42 Is opened, the foam automatic main valve 27 and the automatic water supply valve 28 are kept in a closed state. When the chemical liquid operation valve 24a provided in the waterproof port 24 is opened to perform the foam liquid injection, the water / When the water discharge pressure of the foam liquid supply line 23a is lowered to 80 bar or less and the pressure sensor 29 detects a low pressure of the water / foam liquid supply line 23a and a signal is input to the controller 30, the controller 30 Amplifies the input detection signal by the amplifier 31 and applies it to the input terminal of the binary counter 32. Therefore, the output + Q of the binary counter 32 outputs a low level voltage. Since the electromagnetic relay 33 is driven and the switches 41 and 42 are connected, the form automatic main valve 27 When power is supplied to the water supply valve 28 to open, the foam liquid of the foam tank 22 is supplied and the water is supplied through the water supply line 23b to mix the water and the foam liquid mixed in the chemical liquid supply device 25. It is discharged to the waterproof port 24 through the supply line 25a and the water / foam liquid supply line 23a.

Even if the chemical liquid operation valve 24a is closed after the foam liquid injection is performed, the foam automatic main valve 27 and the automatic water supply valve 28 continue to be opened to perform fire extinguishing by the foam liquid.

In the case where the foam liquid is sprayed and the water spray is to be performed again, the chemical liquid actuating valve 24a is opened again to lower the pressure in the water / foam liquid supply line 23a. The pressure drop is detected by the pressure sensor 29. Since the input to the control unit 30, the output + Q of the binary counter 32 of the control unit 30 again outputs a high level voltage so that the electromagnetic relay 33 is not driven and the switches 41 and 42 are opened. Therefore, the form automatic main valve 27 and the automatic water supply valve 28 is closed so that the foam liquid is no longer supplied, so that only the waterproofing is performed.

In this state, when the chemical liquid operation valve 24a is closed, the pressure of the water / foam liquid supply line 23a is increased, but the output of the pressure sensor 29 is high, but the amplification circuit 31 of the controller 30 has a low output. Since the low state becomes high, the output + Q of the binary counter 32 remains high, and the form automatic main valve 27 and the automatic water supply valve 28 are continuously closed. The state is maintained.

As described above, the foam liquid injection system according to the present invention solves the disadvantage of the foam liquid spray system by wire or wireless by opening and closing the flow path of the water supply line and the foam liquid supply line using the internal waterproof pressure of the water / foam liquid supply line. While the water pipe can be directly operated by direct injection of the foam liquid has the effect of enabling a quick, accurate fire extinguishing.

Claims (2)

A water tank 21 in which water is stored, a foam tank 22 in which foam liquid is stored, a pump 23 for pumping a mixed liquid of water or foam liquid, and a mixed liquid of water or foam liquid supplied by the pump 23 In the foam liquid injection system comprising a waterproof port 24 for spraying a, and a chemical liquid mixing device 25 for mixing water and foam liquid, A chemical liquid operation valve 24a installed in the water / foam liquid supply line 23a discharged to the waterproof port 24 to lower the pressure in the line 23a; A pressure sensor 29 for detecting a pressure difference between the water / foam liquid supply line 23a; An automatic water supply valve 28 for opening and closing a flow path of the water supply line 25a for supplying water to the chemical liquid mixing device 25; A foam automatic main valve 27 for opening and closing a flow path of the foam liquid supply line 22a for supplying the foam liquid to the chemical liquid mixing device 25; The control unit 30 for mixing the water and the foam liquid in the chemical liquid mixing device 25 by opening the automatic water supply valve 28 and the foam automatic main valve 27 by the signal detected by the pressure sensor 29 Form liquid injection system including. The method of claim 1, The control unit 30 has an amplification circuit 31 to which the signal of the pressure sensor 29 is input, a binary counter 32 for counting the signal amplified by the amplification circuit 31, and the binary counter ( Water / foam liquid injection, characterized in that consisting of an electromagnetic relay 33 for opening and closing the form automatic main valve 27 and the automatic water supply valve 28 by operating the relay (41) (42) by the signal counted in 32) system.