CN202892720U - Compressed air foam fire-extinguishing apparatus - Google Patents

Abstract

The utility model is a compressed air foam fire extinguishing device. The water pump is provided with a pressure regulating valve. The connecting pipeline is connected to the foam generator, and the common connecting pipeline is equipped with a flow sensor, whose output signal is connected to the foam pump through the flow controller, and the gas buffer tank and the gas inlet of the foam generator are connected in turn with a pressure reducing valve and a flow regulator. Valve, solenoid valve and second one-way valve, the fire alarm system controls the solenoid valve, the main foam delivery pipe is connected to the fixed pipe network in a specific protection place, and each pipe end of the fixed pipe network is provided with a foam nozzle. This device utilizes the structure of the foam generator, and is equipped with flow and pressure control components in its air and liquid circuits, so that the foam generator can work in the best state, and the compressed air foam output at the end has uniform and stable foam, foaming The multiple and foam state can be adjusted, and the fire extinguishing efficiency is high.

Description

Compressed air foam fire extinguishing device

technical field

The utility model belongs to a fire extinguishing system, in particular to a compressed air foam fire extinguishing device.

Background technique

In recent years, with the improvement of people's living standards year by year, the number of urban car ownership has doubled. In order to solve the problem of vehicle storage, more and more underground parking garages and three-dimensional garages have been built in various places. Since the car itself is a flammable solid material, and there are a large amount of flammable and explosive gasoline and lubricating oil in the fuel tank and the car lubrication system, once a fire occurs, the fire will spread rapidly and form a large area of combustion, and the fire situation is very complicated. It is difficult for the system to extinguish it in time and effectively, so it is easy to cause major economic property losses.

Foam fire extinguishing system is a fire extinguishing system commonly used to extinguish Class A, B, and C liquid fires. In GB50067 "Code for Garage Fire Protection", foam sprinkler fire extinguishing system has been listed as an optional fire extinguishing system.

The existing foam sprinkler fire extinguishing system usually adopts the following two foam generation methods: (1) adopts the air-breathing foam nozzle, and the foam solution is transported in the pipeline, and the negative pressure is generated by the jet of the foam solution at the outlet of the foam nozzle, thereby Inhale air to form foam. (2) It adopts non-air-breathing foam nozzle without air suction port, and its spray mode is similar to that of a sprinkler or water mist nozzle, and is mainly used in the aqueous film-forming foam-water spray system.

The foam produced by the above-mentioned first foam generation method has a very low expansion ratio, low foam stability, and the foam state cannot be adjusted. In addition, the gas temperature in the actual fire scene is generally high, and the high-temperature gas in the fire field will be seriously affected by the foam nozzle outlet. fire extinguishing effect. The foam produced by the above-mentioned second foam generation method is very poor in stability, extremely low in expansion ratio, and the state of the foam cannot be adjusted, so the advantages of foam fire extinguishing technology cannot be fully utilized. Therefore, the existing foam sprinkler fire extinguishing system is more and more difficult to meet the current increasingly complex fire situation.

Compressed air foam fire extinguishing technology is a highly efficient foam fire extinguishing technology developed at the end of last century. Compared with the traditional negative pressure foam fire extinguishing technology, the compressed air foam produced by the positive pressure method has the characteristics of finer and more uniform foam structure and higher foam stability, so that the advantages of foam fire extinguishing technology can be fully utilized and the fire extinguishing efficiency can be greatly improved. In addition, compressed air foam has the characteristics of low frictional resistance and controllable expansion ratio, and the appropriate expansion ratio and foam state can be adjusted according to different protection objects. However, the current compressed air foam fire extinguishing system has complex structure, high operation and maintenance requirements, and is mainly used in mobile fire extinguishing equipment such as fire trucks. At present, there is no compressed air foam automatic fire extinguishing system for specific places such as garages, hangars, and warehouses. device.

Contents of the invention

The purpose of this utility model is to overcome the above-mentioned deficiencies existing in the existing foam sprinkler fire extinguishing system and provide a foam sprinkler system with high foam stability, adjustable foam state, high fire extinguishing efficiency, simple structure and low cost, which is specially used for garages and airplanes. Compressed air foam fire extinguishing devices in fixed places such as warehouses.

The utility model adopts the following technical solutions to achieve the above object: the compressed air foam fire extinguishing device includes a water pump, a foam liquid storage tank, a foam pump, an air compressor and a gas buffer tank thereof, a foam generator and a foam nozzle, and is characterized in that the The outlet of the water pump is provided with a pressure regulating valve, and the outlet pipeline of the foam liquid storage tank is connected with a stop valve, a foam pump and a first one-way valve in sequence, and the pressure adjustment valve at the outlet of the water pump and the outlet pipeline of the foam liquid storage tank The outlet of the first one-way valve is provided with a common connection pipeline connected to the liquid inlet of the foam generator, and the common connection pipeline is provided with a flow sensor, whose output signal is connected to a flow controller, and the electric current output by the flow controller The signal is connected to the flow control input end of the foam pump, and a pressure reducing valve, a flow regulating valve, a solenoid valve and a second one-way valve are sequentially connected between the gas buffer tank outlet of the air compressor and the gas inlet of the foam generator. The automatic control input end of the solenoid valve is connected to the fire alarm system, and the foam outlet of the foam generator is connected to the foam main delivery pipe, which is connected to the fixed pipe network for conveying compressed air foam in a specific protective place, and the fixed pipe network Each pipe end is provided with a foam nozzle.

The utility model can also take the following technical measures:

The pressure regulating valve provided at the outlet of the water pump is a pressure regulating valve or a manual regulating valve, and a backflow regulating valve is provided between the outlet and the inlet of the water pump provided with the manual regulating valve.

The water pump adopts a fire-fighting centrifugal pump, and the water outlet pressure is 0.4-1.6Mpa.

The foam pump adopts a gear pump, a diaphragm pump, a plunger pump or a metering pump, and the pressure of the foam liquid is 0.4-2.0Mpa.

The flow sensor adopts a liquid turbine flow sensor, an electromagnetic flow sensor or a vortex flow sensor.

The air compressor adopts a screw air compressor or a vane air compressor, and the air supply pressure range is 0.5-1.6Mpa.

The foam nozzles at each pipe end of the fixed pipe network are arranged symmetrically with the end of the fire extinguishing foam main delivery pipe as the center.

The foam nozzles are in groups of four, each two foam nozzles in the group are respectively provided with connecting branch pipes, the midpoint of the two connecting branch pipes is provided with a third-level connecting pipe, and the midpoint of each group of third-level connecting pipes A second-stage communicating pipe is provided, and the midpoint of each second-stage communicating pipe is provided with a first-stage communicating pipe, and the midpoint of the first-stage communicating pipe is connected to the end of the foam main conveying pipe.

The beneficial effects and advantages of the utility model are: the compressed air foam fire extinguishing device makes full use of the structure of the foam generator, and is equipped with components such as flow control and pressure control in its air circuit and liquid circuit, so that the foam generator can work In the best state, the final output of compressed air foam has the characteristics of uniform and stable foam, adjustable expansion ratio and foam state, and high fire extinguishing efficiency, thus overcoming the shortcomings of the existing foam spray technology. The utility model has the outstanding advantages of high foam liquid/water mixing precision, simple and reasonable structure, low cost, and low operation and maintenance requirements, and can be widely used for fire protection in places with complex fire conditions such as garages, hangars, and road tunnels.

Description of drawings

Accompanying drawing 1 is the structure diagram of embodiment 1 of the utility model.

Accompanying drawing 2 is the structure diagram of embodiment 2 of the utility model.

Marks in the figure: 1 water pump, 2 pressure regulating valve, 3 water pressure gauge, 4 foam liquid storage tank, 5 stop valve, 6 foam pump, 7 first one-way valve, 8 flow controller, 9 flow sensor, 10 air compression machine, 11 gas buffer tank, 11-1 safety pressure relief valve, 11-2 gas pressure gauge, 12 pressure reducing valve, 13 flow regulating valve, 14 solenoid valve, 15 second one-way valve, 16 foam generator, 17 foam Main conveying pipe, 18 foam nozzle, 19 connecting branch pipe, 20 third level connecting pipe, 21 second level connecting pipe, 22 first level connecting pipe, 23 manual regulating valve, 24 manual return regulating valve.

Detailed ways

Below in conjunction with embodiment and accompanying drawing thereof further illustrate the utility model.

Example 1 shown in Figure 1, the outlet of water pump 1 is provided with a pressure regulating valve, that is, a pressure regulating valve 2 and a water pressure gauge 3, and the outlet pipeline of foam liquid storage tank 4 is connected with a stop valve 5, a foam pump 6 and a first unit in sequence. Directional valve 7, the outlet of the pressure regulating valve 2 at the outlet of the water pump and the outlet of the first one-way valve 7 in the outlet pipeline of the foam liquid storage tank are provided with a common connection pipeline connected to the liquid inlet of the foam generator 16, and the common connection pipe The road is provided with a flow sensor 9, the output signal of which is connected to the flow controller 8, and the electrical signal output by the flow controller 8 is connected to the flow control input end of the foam pump 6.

Between the outlet of the gas buffer tank 11 of the air compressor 10 and the gas inlet of the foam generator 16, a pressure reducing valve 12, a flow regulating valve 13, a solenoid valve 14 and a second one-way valve 15 are sequentially connected, and the gas buffer tank 11 is also provided with Safety relief valve 11-1 and air pressure gauge 11-2. The automatic control input end of the solenoid valve is connected to the fire alarm system.

The foam outlet of the foam generator 16 is connected with a foam main conveying pipe 17, which is connected with a fixed pipe network for conveying compressed air foam in a specific protective place, and each pipe end of the fixed pipe network is provided with a foam nozzle 18.

Embodiment 1 The foam nozzles 18 at each pipe end of the fixed pipe network are arranged symmetrically with the end of the fire-extinguishing foam main delivery pipe 17 as the center. Specifically, four foam nozzles 18 are used as a group, and each two foam nozzles in the group are respectively arranged between two foam nozzles. There are connecting branch pipes 19, the midpoint of the two connecting branch pipes is provided with a third-level connecting pipe 20, the midpoint of each group of third-level connecting pipes 20 is provided with a second-level connecting pipe 21, and the midpoint of each second-level connecting pipe 21 A first-stage communication pipe 22 is provided, and the midpoint of the first-stage communication pipe 22 is connected to the end of the main foam delivery pipe 17 . The arrangement and connection of foam sprayer 18 can guarantee that the foam pressure of its spraying is consistent

The water pump 1 of embodiment 1 adopts a fire-fighting centrifugal pump, and the water outlet pressure is 0.4-1.6Mpa. The foam pump 6 adopts a gear pump, a diaphragm pump, a plunger pump or a metering pump, and the foam liquid pressure is 0.4Mpa-2.0Mpa.

The flow sensor 9 of Embodiment 1 adopts a liquid turbine flow sensor, an electromagnetic flow sensor or a vortex flow sensor.

The air compressor of embodiment 1 adopts screw type air compressor or vane type air compressor, and the air supply pressure range is 0.5～1.6Mpa.

In addition, the foam generator 16 of Embodiment 1 adopts a foam gun mixer, such as CFAS-001. Foam nozzle 18 adopts closed foam nozzle or open foam nozzle, and the model of open foam nozzle is CAF-25.

As shown in Figure 2 in Example 2, the outlet of the water pump 1 is provided with a pressure regulating valve, that is, a manual regulating valve 23 , and a backflow regulating valve 24 is provided between the outlet and the inlet of the water pump 1 . The manual adjustment valve 23 cooperates with the return flow adjustment valve 24 to accurately adjust the outlet pressure of the water pump 1 and keep it stable.

The other structures of Embodiment 2 are the same as those of Embodiment 1 and will not be repeated here.

The working process of the utility model is briefly described below: daily, the air compressor is in the power-on operation state to ensure that there is a certain pressure of gas in the gas buffer tank and the gas pipeline. When a fire breaks out in a specific protected area, the fire detection controller and its fire detectors installed in the specific protected area will start the water pump to start water supply, and the flow controller will start the foam pump according to the flow signal transmitted by the flow sensor, and adjust the speed of the foam pump Control the injection amount of foam liquid, make the foam liquid and water mix according to the set ratio, and the foaming ratio can be adjusted arbitrarily from 6-40. The foam liquid and water are mixed in proportion and sent to the foam generator. At the same time, the fire detection controller and its fire detector control the solenoid valve to make the high-pressure gas flow into the foam generator, and the compressed air foam output by the foam generator passes through the main delivery pipe. And the fixed pipe network is sent to each foam nozzle to spray to the protection area for fire protection. The utility model can set the water pump to start automatically according to the fire extinguishing and protection requirements in the specific protection area.

Claims (8)

1. compressed air foam fire-extinguishing apparatus, comprise water pump, foam liquid tank, foam pump, air compressor and gas buffer tank thereof, foam producer and foam nozzle, it is characterized in that: described exit of pump is provided with pressure-regulating valve, described foam liquid tank export pipeline is connected with stop valve in turn, foam pump and the first check valve, the outlet of the first check valve in the pressure-regulating valve of described exit of pump and the foam liquid tank export pipeline is provided with the shared connecting line that is connected in the foam producer liquid-inlet, described shared connecting line is provided with flow sensor, its output signal is connected in flow controller, the signal of telecommunication of described flow controller output is connected in foam pump flow-control input, be connected with pressure-reducing valve in turn between the gas buffer tank outlet of described air compressor and the foam producer gas feed, flow control valve, magnetic valve and the second check valve controlled manually or automatically, the automatic control input end of described magnetic valve is connected in fire alarm system, described foam producer foam outlet is connected with the foam main feedline, main feedline is connected with the fixedly pipe network of the conveying compressed-air foam in specific protection place, and fixedly each pipe end of pipe network is provided with foam nozzle.

2. extinguishing device according to claim 1, it is characterized in that: the pressure-regulating valve of described exit of pump setting is pressure regulator valve or manual modulation valve, arranges between its outlet of water pump of manual modulation valve and the entrance and is provided with manual return valve.

3. extinguishing device according to claim 1 is characterized in that: described water pump adopts the fire-fighting centrifugal pump, and discharge pressure is 0.4～1.6Mpa.

4. extinguishing device according to claim 1 is characterized in that: described foam pump adopts gear pump or membrane pump or plunger displacement pump or measuring pump, and foam solution pressure is 0.4～2.0Mpa.

5. extinguishing device according to claim 1 is characterized in that: described flow sensor employing liquid turbine flow sensor or electromagnetic flow transducer or vortex flow sensors.

6. extinguishing device according to claim 1 is characterized in that: described air compressor adopts screw air compressor or sliding-vane air compressor, and the supply gas pressure scope is 0.5～1.6Mpa.

7. extinguishing device according to claim 1, it is characterized in that: the foam nozzle of described each pipe end of fixedly pipe network is arranged symmetrically with centered by fire foam main feedline end.

8. extinguishing device according to claim 7, it is characterized in that: described foam nozzle is take four as one group, be respectively equipped with the connection arm between per two foam nozzles in the group, two mid points that are communicated with arm are provided with third level communicating pipe, each mid point of organizing third level communicating pipe is provided with second level communicating pipe, the mid point of each second level communicating pipe is provided with first order communicating pipe, and the mid point of first order communicating pipe is connected with foam main feedline end.

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