Compressed air foam fire extinguishing system

Abstract

The utility model discloses a compressed air foam fire extinguishing system which comprises a fire monitor and a control cabinet, one end of the fire monitor is connected with a third connecting pipe, the third connecting pipe is provided with an electromagnetic valve electrically connected with the control cabinet, and the compressed air foam fire extinguishing system further comprises a compressed air foam generating assembly. The compressed air foam generating assembly comprises a premixed liquid storage tank, a high-pressure gas cylinder and a gas-liquid mixing device, the high-pressure gas cylinder and a pressure reducing valve on the high-pressure gas cylinder are arranged on one side of the premixed liquid storage tank, a pressure transmitter is connected to the first connecting pipe, a flow transmitter is connected to the second connecting pipe, and the gas-liquid mixing device is connected to the premixed liquid storage tank. And the gas-liquid mixing device is connected to the third connecting pipe. According to the novel air foam fire extinguishing system, foam and gas can be mixed in advance through the arranged premixed liquid storage tank, mixing is conducted again after mixing, a better mixing effect is conveniently achieved, and the gas and the foam can be better combined through the arranged gas-liquid mixing device, so that the good mixing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fire extinguishers, in particular to a compressed air foam fire extinguishing system. Background Art

[0002] In recent years, explosive and vicious fires have frequently occurred in places such as power transformers, highway tunnels, and petrochemical oil terminals in my country, especially large oil-immersed power transformers. Once a fire occurs, it is very easy to form splash fires and three-dimensional flowing fires at the same time. The traditional sprinkler fire extinguishing system has a dispersed spray of fire extinguishing agent with low intensity, and it cannot suppress explosive splash fires. Only the fixed fire cannon fire extinguishing system can effectively extinguish the source of the fire and prevent the spread of the fire by concentrating the fire extinguishing agent at a high intensity on the fire site. The ordinary water cannon system not only has a long spraying time, a large amount of water consumption, and high power consumption of fire-fighting equipment, but also has a low fire extinguishing efficiency and is not easy to quickly extinguish the fire and prevent the spread. Therefore, the combination of advanced and efficient fire extinguishing agents and fire cannon system technology is the best solution to solve the fire protection problems in the above-mentioned places.

[0003] Compressed air foam is called the second generation of foam. It appeared internationally in the 1990s and is currently used in my country's main fire trucks. Developed countries have already adopted fixed system firefighting robots and automatic compressed air foam fire cannon fire extinguishing systems in traffic tunnels. This project actively absorbs advanced international firefighting technology and standard experience, determines the design parameters of the system through real fire extinguishing test research, and completes the "Technical Regulations for Compressed Air Foam Fire Cannon Fire Extinguishing Systems", which provides a technical basis for the engineering design, construction and acceptance of the fire extinguishing system;

[0004] According to the search of publication number CN113577608A, a compressed air foam fire extinguishing device can be tested by directly closing the second valve and opening the first valve without external equipment during testing, so that the performance of the compressor and the valve can be tested. The air is directly discharged into the environment, and the test is simple. Through the design of the third valve, during the test, the third valve, the fourth valve, the water pump, the fifth valve, and the water tank form a closed loop, and the entire water circuit test can be completed inside the device without external equipment and without wasting water.

[0005] Although this equipment achieves the effect of saving money, it adopts a direct mixing method when mixing foam and gas during use without prior mixing, resulting in poor mixing effect, so that the foam fire extinguishing effect is not very good. Utility Model Content

[0006] 1. Technical problems to be solved

[0007] The purpose of the utility model is to provide a compressed air foam fire extinguishing system. By setting a premixed liquid storage tank, the foam and gas can be mixed in advance, and then mixed again to achieve a better mixing effect. By setting a gas-liquid mixing device, the gas can be better combined with the foam to achieve a good mixing effect.

[0008] 2. Technical solution

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a compressed air foam fire extinguishing system, comprising a fire monitor and a control cabinet, one end of the fire monitor is connected to a third connecting pipe, and the third connecting pipe is provided with an electromagnetic valve electrically connected to the control cabinet, characterized in that it also includes a compressed air foam generating component, the compressed air foam generating component includes a premixed liquid storage tank, a high-pressure gas cylinder and a gas-liquid mixing device, one side of the premixed liquid storage tank is provided with a high-pressure gas cylinder and a pressure reducing valve on the high-pressure gas cylinder, the outer side of the premixed liquid storage tank is provided with a gas-liquid mixing device, a hose for communication is provided between the premixed liquid storage tank and the high-pressure gas cylinder, a second connecting pipe for communication is provided between the premixed liquid storage tank and the gas-liquid mixing device, a first connecting pipe with one end connected to the hose and the other end threadedly connected to the gas-liquid mixing device is provided on the gas-liquid mixing device, a pressure transmitter is connected to the first connecting pipe, a flow transmitter is connected to the second connecting pipe, and the gas-liquid mixing device is connected to the third connecting pipe.

[0010] Furthermore, a stirring part is provided inside the gas-liquid mixing device, and the stirring part includes a stirring rod and a motor installed on the outer wall of the gas-liquid mixing device, and one end of the stirring rod is connected to the output end of the motor.

[0011] Furthermore, a plurality of dispersion pipes are provided at the inner bottom of the gas-liquid mixing device, one end of each dispersion pipe is connected to a gas distribution pipe, and the gas distribution pipe is connected to the first connecting pipe.

[0012] Furthermore, a liquid inlet is provided at the connection between the gas-liquid mixing device and the second connecting pipe, one end of the liquid inlet is threadedly connected to the second connecting pipe, and the other end passes through the shell of the gas-liquid mixing device and is fixedly connected to the gas-liquid mixing device.

[0013] Furthermore, a fixed plate and a telescopic rod passing through the fixed plate are provided in the liquid inlet, one end of the telescopic rod is connected to an anti-backflow plate, and a telescopic spring is sleeved on the outer wall of the telescopic rod, one end of which is against the fixed plate and the other end is against the anti-backflow plate.

[0014] 3. Beneficial effects

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] (1) In this solution, the gas-liquid mixing device can be used to introduce gas into the foam in advance for pre-mixing, and then mixed again to achieve a fully mixed effect; the stirring part can be used to mix the incoming foam and gas, thereby achieving a good gas-liquid mixing effect and improving the fire extinguishing effect of the foam;

[0017] (2) In this scheme, multiple gas distribution pipes are set up to form multiple airways when the gas enters, thereby achieving a good air intake effect; the anti-backflow structure is set up to increase the pressure inside the gas-liquid mixing device when the gas enters, thereby blocking the mixed liquid and gas, avoiding backflow, and improving the mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the internal structure of the utility model;

[0019] Figure 2 For this utility model Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0020] Figure 3 It is a schematic diagram of the work flow structure of the utility model.

[0021] In the figure: 1. premix liquid storage tank; 2. high-pressure gas cylinder; 3. pressure reducing valve; 4. hose; 5. first connecting pipe; 6. pressure transmitter; 7. second connecting pipe; 8. flow transmitter; 9. gas-liquid mixing device; 10. third connecting pipe; 11. fire monitor; 12. control cabinet; 13. stirring rod; 14. dispersion pipe; 15. gas distribution pipe; 16. liquid inlet; 17. fixed plate; 18. anti-backflow plate; 19. telescopic rod; 20. telescopic spring. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Embodiment 1

[0024] See also Figure 1-Figure 3, this embodiment provides the following technical solutions; a compressed air foam fire extinguishing system, including a fire monitor 11 and a control cabinet 12, one end of the fire monitor 11 is connected to a third connecting pipe 10, the third connecting pipe 10 is provided with an electromagnetic valve electrically connected to the control cabinet 12, and also includes a compressed air foam generating component, the compressed air foam generating component includes a premixed liquid storage tank 1, a high-pressure gas cylinder 2 and a gas-liquid mixing device 9, one side of the premixed liquid storage tank 1 is provided with a high-pressure gas cylinder 2 and a pressure reducing valve 3 on the high-pressure gas cylinder 2, the outer side of the premixed liquid storage tank 1 is provided with a gas-liquid mixing device 9, a hose 4 for communication is provided between the premixed liquid storage tank 1 and the high-pressure gas cylinder 2, a second connecting pipe 7 for communication is provided between the premixed liquid storage tank 1 and the gas-liquid mixing device 9, a first connecting pipe 5 is provided on the gas-liquid mixing device 9, one end of which is connected to the hose 4 and the other end is threadedly connected to the gas-liquid mixing device 9, and the first connecting pipe 5 is connected to a pressure transmitter 6. The second connecting pipe 7 is connected with a flow transmitter 8, and the gas-liquid mixing device 9 is connected with the third connecting pipe 10; a stirring part is arranged inside the gas-liquid mixing device 9, and the stirring part includes a stirring rod 13 and a motor installed on the outer wall of the gas-liquid mixing device 9, and one end of the stirring rod 13 is connected to the output end of the motor; a plurality of dispersion pipes 14 are arranged at the inner bottom of the gas-liquid mixing device 9, and one end of the dispersion pipe 14 is connected with a gas distribution pipe 15, and the gas distribution pipe 15 is connected to the first connecting pipe 5; through the arranged gas-liquid mixing device 9, the gas can be introduced into it in advance for pre-mixing, and then mixed again to achieve a fully mixed effect; through the arranged stirring part, the incoming foam and gas can be mixed, so as to achieve a good gas-liquid mixing effect and improve the fire extinguishing effect of the foam; through the arranged multiple gas distribution pipes 15, multiple airways can be formed when the gas enters, so as to achieve a good air intake effect.

[0025] See also Figure 2 A liquid inlet 16 is provided at the connection between the gas-liquid mixing device 9 and the second connecting pipe 7, one end of the liquid inlet 16 is threadedly connected to the second connecting pipe 7, and the other end passes through the shell of the gas-liquid mixing device 9 and is fixedly connected to the gas-liquid mixing device 9; a fixed plate 17 and a telescopic rod 19 passing through the fixed plate 17 are provided in the liquid inlet 16, one end of the telescopic rod 19 is connected to an anti-backflow plate 18, and a telescopic spring 20 is sleeved on the outer wall of the telescopic rod 19, one end of which is against the fixed plate 17 and the other end is against the anti-backflow plate 18; the anti-backflow structure can increase the internal pressure of the gas entering the gas-liquid mixing device 9, block the mixed liquid and gas, avoid backflow, and improve the mixing effect.

[0026] Specifically, firstly, gas is introduced into the hose 4 through the high-pressure gas cylinder 2, and the hose 4 enters the premixed liquid storage tank 1, and the gas and foam are premixed. After premixing, the bubbles are introduced into the gas-liquid mixing device 9, and the gas is continued to be introduced, and the motor is started. The motor drives the stirring rod 13 to rotate to stir the gas and foam. The bubbles introduced at this time are prevented from backflowing through the anti-backflow plate 18. The first connecting pipe 5 introduces the gas into the gas-liquid mixing device 9 through the dispersion pipe 14 and the gas distribution pipe 15 to complete the gas filling. After mixing again, the bubbles enter the fire monitor 11 through the third connecting pipe 10 to complete the spraying. The control cabinet 12 is set to control the pressure reducing valve 3, the pressure transmitter 6, the flow transmitter 8 and the electromagnetic valve. When the liquid is introduced, the anti-backflow plate 18 is forced to move under the action of pressure, and the material body enters the gas-liquid mixing device 9 through the liquid inlet 16. At this time, the anti-backflow plate 18 generates a pulling force on the telescopic spring 20. When the force disappears, the anti-backflow plate 18 returns to its original position to avoid backflow.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A compressed air foam fire extinguishing system, comprising a fire monitor (11) and a control cabinet (12), wherein one end of the fire monitor (11) is connected to a third connecting pipe (10), and the third connecting pipe (10) is provided with an electromagnetic valve electrically connected to the control cabinet (12), characterized in that: The invention also comprises a compressed air foam generating assembly, the compressed air foam generating assembly comprising a premixed liquid storage tank (1), a high-pressure gas cylinder (2) and a gas-liquid mixing device (9), one side of the premixed liquid storage tank (1) is provided with a high-pressure gas cylinder (2) and a pressure reducing valve (3) on the high-pressure gas cylinder (2), the outer side of the premixed liquid storage tank (1) is provided with a gas-liquid mixing device (9), a hose (4) for communication is provided between the premixed liquid storage tank (1) and the high-pressure gas cylinder (2), a second connecting pipe (7) for communication is provided between the premixed liquid storage tank (1) and the gas-liquid mixing device (9), the gas-liquid mixing device (9) is provided with a first connecting pipe (5) having one end connected to the hose (4) and the other end threadedly connected to the gas-liquid mixing device (9), the first connecting pipe (5) is connected to a pressure transmitter (6), the second connecting pipe (7) is connected to a flow transmitter (8), and the gas-liquid mixing device (9) is connected to the third connecting pipe (10).

2. The compressed air foam fire extinguishing system according to claim 1, characterized in that: The gas-liquid mixing device (9) is provided with a stirring portion inside, the stirring portion comprising a stirring rod (13) and a motor mounted on the outer wall of the gas-liquid mixing device (9), one end of the stirring rod (13) being connected to the output end of the motor.

3. The compressed air foam fire extinguishing system according to claim 1, characterized in that: A plurality of dispersion pipes (14) are arranged at the inner bottom of the gas-liquid mixing device (9), one end of each dispersion pipe (14) is connected to a gas distribution pipe (15), and the gas distribution pipe (15) is connected to the first connecting pipe (5).

4. The compressed air foam fire extinguishing system according to claim 1, characterized in that: A liquid inlet (16) is provided at the connection between the gas-liquid mixing device (9) and the second connecting pipe (7); one end of the liquid inlet (16) is threadedly connected to the second connecting pipe (7), and the other end passes through the shell of the gas-liquid mixing device (9) and is fixedly connected to the gas-liquid mixing device (9).

5. The compressed air foam fire extinguishing system according to claim 4, characterized in that: A fixed plate (17) and a telescopic rod (19) penetrating the fixed plate (17) are arranged in the liquid inlet (16); one end of the telescopic rod (19) is connected to an anti-backflow plate (18); and a telescopic spring (20) is sleeved on the outer wall of the telescopic rod (19), one end of which abuts against the fixed plate (17) and the other end of which abuts against the anti-backflow plate (18).

Images