Nitrogen foam fire extinguishing system

Abstract

The utility model discloses a nitrogen foam fire extinguishing system, which relates to the technical field of fire fighting equipment and comprises a foam stock solution storage tank, a foaming stirring device, a gas-liquid mixing device, a nitrogen storage tank and a spraying device, the foaming stirring device is provided with a first liquid inlet, a second liquid inlet and a foam liquid outlet, one end of the gas-liquid mixing device is provided with an inlet end, and the other end of the gas-liquid mixing device is provided with an outlet end. A gas inlet pipe is arranged on one side of the inlet end of the gas-liquid mixing device, the foam stock solution storage tank is connected with the first liquid inlet through a first input pipeline, the second liquid inlet is connected with a fire-fighting water source through a second input pipeline, and the foam liquid outlet is connected with the inlet end through a foam liquid input pipeline. The nitrogen storage tank is connected with the gas inlet pipe through a gas input pipeline, the outlet end of the nitrogen storage tank is connected with the spraying device through a foam liquid output pipeline, and the problems that the fire extinguishing effect is reduced and the fire extinguishing speed is reduced when compressed air is adopted for foaming in an existing foam fire extinguishing system are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fire fighting equipment, in particular to a nitrogen foam fire extinguishing system. Background Art

[0002] The foam fire extinguishing system is a common fire extinguishing equipment, usually used to extinguish liquid fires. It releases foam liquid to form a layer of foam film covering the surface of the fire, blocking the contact between the flame and oxygen, thereby extinguishing the fire. The foam fire extinguishing system can effectively deal with flammable liquid fires, such as oil fires, solvent fires, etc. The foam fire extinguishing system usually consists of a foam liquid storage tank, a pump, a pipeline system, a nozzle, etc. When a fire occurs, the pump sends the foam liquid into the pipeline system, and the foam liquid is released through the nozzle to form a foam film covering the surface of the fire.

[0003] The foam fire extinguishing system in the prior art mainly foams by injecting compressed air, and finally forms foam for spraying. However, since air contains oxygen, the compressed air compressed by the compressor also contains oxygen, and the presence of oxygen will reduce the fire extinguishing effect and slow down the fire extinguishing speed when extinguishing the fire. Therefore, the foam fire extinguishing system in the prior art has the problem that the fire extinguishing effect and the fire extinguishing speed will be reduced when using compressed air for foaming.

[0004] In the invention with application number: CN202111456442.3 and publication number: CN114100029B, a compressed air foam fire extinguishing system is disclosed, including a foam mixture processing mechanism, a compressed air supply device, a foam generating device and a fire fighting pipe network. Although it can achieve the purpose of fire extinguishing, it still has the problem of reducing the fire extinguishing effect and slowing down the fire extinguishing speed when using compressed air for foaming. Utility Model Content

[0005] Based on this, in order to solve the above problems, the utility model proposes a nitrogen foam fire extinguishing system, which solves the problem that the current foam fire extinguishing system reduces the fire extinguishing effect and slows down the fire extinguishing speed when using compressed air for foaming.

[0006] The technical solution of the utility model is:

[0007] A nitrogen foam fire extinguishing system comprises a foam stock liquid storage tank, a foaming stirring device, a gas-liquid mixing device, a nitrogen storage tank and a spraying device, wherein the foaming stirring device is provided with a first liquid inlet, a second liquid inlet and a foam liquid outlet, the gas-liquid mixing device is provided with an inlet end at one end and an outlet end at the other end, and a gas inlet pipe is provided on one side of the inlet end of the gas-liquid mixing device;

[0008] The foam stock liquid storage tank is connected to the first liquid inlet through a first input pipeline, and the first input pipeline is provided with a first solenoid valve, a first metering pump and a first one-way valve in sequence. The second liquid inlet is connected to a fire water source through a second input pipeline, and the second input pipeline is provided with a second one-way valve, a second metering pump and a second solenoid valve in sequence. The foam liquid outlet is connected to the inlet end through a foam liquid input pipeline, and the foam liquid input pipeline is provided with a third solenoid valve, an input pump and a third one-way valve in sequence.

[0009] The nitrogen storage tank is connected to the gas inlet pipe through a gas input pipeline, on which a pressure reducing valve, a gas solenoid valve and a gas one-way valve are arranged in sequence. The outlet end is connected to the spray device through a foam liquid output pipeline, on which an output ball valve and an output pump are arranged.

[0010] Preferably, the gas-liquid mixing device includes an entry portion, a connecting portion and an outlet portion which are connected in sequence, and a gas-liquid flow channel is provided in the entry portion, the connecting portion and the outlet portion, an air intake pipe is provided on one side of the entry portion, one end of the air intake pipe is arranged in the gas-liquid flow channel of the entry portion, and the other end passes through the entry portion and is fixedly connected to the entry portion, the inlet end is arranged at one end of the entry portion, and the outlet end is arranged at one end of the outlet portion, and the gas inlet pipe is connected to the end flange of the air intake pipe passing through one end of the entry portion.

[0011] Preferably, a mixing barrier is provided in the gas-liquid mixing device, one end of the mixing barrier is located in the connecting part and is threadedly connected to the connecting part, and the other end is located in the outlet part, a gas-liquid mixing flow channel is provided in the mixing barrier, the gas-liquid mixing flow channel passes through one end of the mixing barrier located in the connecting part and is connected to the gas-liquid flow channel, and a plurality of gas-liquid outlet grooves are provided at one end of the mixing barrier located in the outlet part, and the plurality of gas-liquid outlet grooves are connected to the gas-liquid mixing flow channel.

[0012] Preferably, the foaming stirring device includes a stirring tank body, a stirring component, a mounting bracket and a driving component. The stirring tank body is arranged on the mounting bracket. A accommodating cavity is provided in the stirring tank body. The stirring component is arranged in the accommodating cavity and passes through the stirring tank body at both ends. The stirring component is rotatably connected to the stirring tank body. The driving component is arranged on one side of the stirring tank body and is cooperated with one end of the stirring component for driving the stirring component.

[0013] Preferably, the first liquid inlet and the second liquid inlet are arranged on the top of the stirring tank body and are communicated with the containing cavity.

[0014] Preferably, the foam liquid outlet is arranged at the bottom of the stirring tank body and is communicated with the containing cavity.

[0015] Preferably, the stirring assembly includes a stirring shaft and a plurality of stirring members fixedly arranged on the stirring shaft. The two ends of the stirring shaft respectively pass through the two sides of the stirring tank body and are rotatably connected to the stirring tank body. The driving assembly is cooperated with one end of the stirring shaft to drive the stirring shaft to rotate.

[0016] Preferably, four mounting planes are provided at one end of the stirring shaft located in the accommodating cavity, and the stirring element includes a pair of connecting plates and a stirring rod. The pair of connecting plates are respectively arranged on both sides of the stirring shaft and are coordinated with two of the mounting planes. The stirring rod passes through one end of the pair of connecting plates and is fixedly connected to the pair of connecting plates. The other end of the pair of connecting plates is fixed by a pair of fixing bolts. The stirring rod and the pair of fixing bolts are coordinated with the other two mounting planes, and paddles are fixed at both ends of the stirring rod.

[0017] Preferably, it further comprises a mounting base, the mounting bracket is arranged on the mounting base, a mounting frame body is arranged on the mounting base, and the mounting frame body is arranged in coordination with the mounting bracket and is located on one side of the mounting bracket.

[0018] Preferably, the driving assembly includes a driving motor and a gear reversing box, which are cooperatively arranged on a mounting frame, and the driving motor is connected to one end of the stirring shaft passing through the stirring tank body through the gear reversing box to drive the stirring shaft to rotate.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] When in use, the foam stock liquid stored in the foam stock liquid storage tank enters the foaming stirring device through the first input pipeline and the first liquid inlet, the fire water source enters the foaming stirring device through the second input pipeline and the second liquid inlet, the foam stock liquid and the fire water source are mixed in the foaming stirring device to form foam liquid; the foam liquid enters the gas-liquid mixing device through the foam liquid input pipeline, the nitrogen in the nitrogen storage tank enters the gas-liquid mixing device through the gas input pipeline and the gas inlet pipe, the nitrogen is mixed with the foam liquid through the gas-liquid mixing device to form nitrogen foam, the mixed nitrogen foam enters the spraying device through the foam liquid output pipeline, and the nitrogen foam is sprayed to the fire scene through the spraying device to complete the fire extinguishing. Using nitrogen instead of compressed air solves the problem that the current foam fire extinguishing system reduces the fire extinguishing effect and slows down the fire extinguishing speed when using compressed air for foaming. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a nitrogen foam fire extinguishing system described in an embodiment of the utility model;

[0022] Figure 2 The structure of the gas-liquid mixing device described in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0023] Figure 3 The structure of the gas-liquid mixing device described in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0024] Figure 4 It is a schematic cross-sectional structure diagram of the gas-liquid mixing device described in the embodiment of the utility model;

[0025] Figure 5 It is a partial structural schematic diagram of the gas-liquid mixing device described in the embodiment of the utility model;

[0026] Figure 6 It is a structural schematic diagram of the foaming and stirring device described in the embodiment of the utility model;

[0027] Figure 7 This is a schematic diagram of the partial structure of the foaming and stirring device described in the embodiment of the utility model. Figure 1 ;

[0028] Figure 8 This is a schematic diagram of the partial structure of the foaming and stirring device described in the embodiment of the utility model. Figure 2 ;

[0029] Description of reference numerals:

[0030] 10-foam stock liquid storage tank, 100-first liquid inlet, 101-second liquid inlet, 102-foam liquid outlet, 103-inlet end, 104-outlet end, 105-gas inlet pipe, 106-first input pipeline, 107-first solenoid valve, 108-first metering pump, 109-first one-way valve, 110-second input pipeline, 111-fire water source, 112-second one-way valve, 113-second metering pump, 114-second solenoid valve, 115-foam liquid input pipeline, 116-third solenoid valve, 117-input pump, 118-third one-way valve, 119-gas input pipeline, 120-pressure reducing valve, 121-gas solenoid valve, 122-gas one-way valve, 123-foam liquid output pipeline, 124-output ball valve, 125-output pump, first manual valve 126, second manual Valve 127, the third manual valve 128, 20-foaming stirring device, 200-stirring tank body, 201-stirring component, 202-mounting bracket, 203-driving component, 204-accommodating cavity, 205-stirring shaft, 206-stirring member, 207-mounting plane, 208-connecting plate, 209-stirring rod, 210-fixing bolt, 211-paddle, 212-driving motor, 213-gear reversing box, 30-gas-liquid mixing device, 300-entry part, 301-connecting part, 302-outlet part, 303-gas-liquid flow channel, 304-air inlet pipe, 305-mixing blocking member, 306-gas-liquid mixing flow channel, 307-gas-liquid outlet tank, 40-nitrogen storage tank, 50-spraying device, 500-spraying water cannon, 501-foam generator, 60-mounting base, 600-mounting frame. DETAILED DESCRIPTION

[0031] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0032] Example:

[0033] like Figure 1 As shown, in order to solve the above problems, the present embodiment discloses a nitrogen foam fire extinguishing system, comprising a foam stock liquid storage tank 10, a foaming stirring device 20, a gas-liquid mixing device 30, a nitrogen storage tank 40 and a spraying device 50, the foaming stirring device 20 is provided with a first liquid inlet 100, a second liquid inlet 101 and a foam liquid outlet 102, the gas-liquid mixing device 30 is provided with an inlet end 103 at one end and an outlet end 104 at the other end, and a gas inlet pipe 105 is provided on one side of the inlet end 103 of the gas-liquid mixing device 30;

[0034] The foam stock liquid storage tank 10 is connected to the first liquid inlet 100 through a first input pipeline 106, and the first input pipeline 106 is provided with a first solenoid valve 107, a first metering pump 108 and a first check valve 109 in sequence. The second liquid inlet 101 is connected to a fire water source 111 through a second input pipeline 110, and the second input pipeline 110 is provided with a second check valve 112, a second metering pump 113 and a second solenoid valve 114 in sequence. The foam liquid outlet 102 is connected to the inlet end 103 through a foam liquid input pipeline 115, and the foam liquid input pipeline 115 is provided with a third solenoid valve 116, an input pump 117 and a third check valve 118 in sequence.

[0035] The nitrogen storage tank 40 is connected to the gas inlet pipe 105 through a gas input pipeline 119, on which a pressure reducing valve 120, a gas solenoid valve 121 and a gas one-way valve 122 are provided in sequence. The outlet end 104 is connected to the spray device 50 through a foam liquid output pipeline 123, on which an output ball valve 124 and an output pump 125 are provided.

[0036] When in use, the foam stock liquid stored in the foam stock liquid storage tank 10 enters the foam stirring device 20 through the first input pipe 106 and the first liquid inlet 100, and the fire water source 111 enters the foam stirring device 20 through the second input pipe 110 and the second liquid inlet 101. The foam stock liquid and the fire water source 111 are mixed in the foam stirring device 20 to form foam liquid; the foam liquid enters the gas-liquid mixing device 30 through the foam liquid input pipe 115, and the nitrogen in the nitrogen storage tank 40 enters the gas-liquid mixing device 30 through the gas input pipe 119 and the gas inlet pipe 105. The nitrogen is mixed with the foam liquid through the gas-liquid mixing device 30 to form nitrogen foam. The mixed nitrogen foam enters the spraying device 50 through the foam liquid output pipe 123, and the nitrogen foam is sprayed to the fire scene through the spraying device 50 to complete the fire extinguishing. The use of nitrogen instead of compressed air solves the problem that the current foam fire extinguishing system uses compressed air for foaming, which reduces the fire extinguishing effect and slows down the fire extinguishing speed.

[0037] Among them, the first solenoid valve 107, the first metering pump 108 and the first one-way valve 109 control the flow of the foam stock solution to ensure a stable supply of the foam stock solution; the second one-way valve 112, the second metering pump 113 and the second solenoid valve 114 control the flow of the fire water source 111 to dilute and adjust the concentration of the foam stock solution; the pressure reducing valve 120, the gas solenoid valve 121 and the gas one-way valve 122 control the flow of nitrogen and play a role in reducing the nitrogen pressure; the output ball valve 124 and the output pump 125 control the flow of the mixed nitrogen foam.

[0038] Preferably, a first manual valve 126 is provided on the first input pipeline 106 , and the first manual valve 126 is arranged at one end of the first solenoid valve 107 .

[0039] Preferably, a second manual valve 127 is provided on the second input pipeline 110 , and the second manual valve 127 is arranged at one end of the second solenoid valve 114 .

[0040] Preferably, a third manual valve 128 is provided on the gas input pipeline 119 , and the third manual valve 128 is arranged between the pressure reducing valve 120 and the gas solenoid valve 121 .

[0041] like Figures 2 to 5 As shown, in order to facilitate mixing nitrogen with foam liquid to form nitrogen foam, this embodiment is modified on the basis of the above embodiment. The difference from the above embodiment is that the gas-liquid mixing device 30 includes an inlet portion 300, a connecting portion 301 and an outlet portion 302 which are connected in sequence, and a gas-liquid flow channel 303 is provided in the inlet portion 300, the connecting portion 301 and the outlet portion 302. An air inlet pipe 304 is provided on one side of the inlet portion 300. One end of the air inlet pipe 304 is arranged in the gas-liquid flow channel 303 of the inlet portion 300, and the other end passes through the inlet portion 300 and is fixedly connected to the inlet portion 300. The inlet end 103 is arranged at one end of the inlet portion 300, and the outlet end 104 is arranged at one end of the outlet portion 302. The gas inlet pipe 105 is connected to the end flange of the air inlet pipe 304 passing through one end of the inlet portion 300.

[0042] Preferably, the diameter of the gas-liquid flow channel 303 in the connecting portion 301 is smaller than the diameters of the entrance portion 300 and the outlet portion 302. The entrance portion 300 and the outlet portion 302 are both variable diameter structures, and the diameter of the end of the entrance portion 300 and the outlet portion 302 connected to the connecting portion 301 is smaller than the end away from the connecting portion 301.

[0043] When in use, nitrogen enters the gas-liquid flow channel 303 of the gas-liquid mixing device 30 through the gas inlet pipe 105 and the air inlet pipe 304, and then mixes with the foam liquid to form nitrogen foam during the flow process, thereby achieving mixing of nitrogen and foam liquid.

[0044] In order to further mix the nitrogen and the foam liquid, a mixing blocker 305 is provided in the gas-liquid mixing device 30. One end of the mixing blocker 305 is located in the connecting portion 301 and is threadedly connected to the connecting portion 301, and the other end is located in the outlet portion 302. A gas-liquid mixing flow channel 306 is provided in the mixing blocker 305. The gas-liquid mixing flow channel 306 penetrates one end of the mixing blocker 305 located in the connecting portion 301 and is connected to the gas-liquid flow channel 303. A plurality of gas-liquid outlet grooves 307 are provided at one end of the mixing blocker 305 located in the outlet portion 302, and the plurality of gas-liquid outlet grooves 307 are connected to the gas-liquid mixing flow channel 306.

[0045] When in use, the nitrogen gas and the foam liquid pass through the gas-liquid mixing channel 306 and the gas-liquid outlet groove 307, so that the nitrogen gas and the foam liquid are further mixed to form nitrogen foam.

[0046] like Figures 6 to 8 As shown, in order to facilitate the mixing of the foam concentrate and the fire water source 111 in proportion and then stirring and foaming to produce a diluted foam liquid, this embodiment is modified on the basis of the above embodiment. The difference from the above embodiment is that the foaming and stirring device 20 includes a stirring tank body 200, a stirring component 201, a mounting bracket 202 and a driving component 203. The stirring tank body 200 is arranged on the mounting bracket 202. A accommodating cavity 204 is arranged in the stirring tank body 200. The stirring component 201 is arranged in the accommodating cavity 204, and both ends pass through the stirring tank body 200. The stirring component 201 is rotatably connected to the stirring tank body 200. The driving component 203 is arranged on one side of the stirring tank body 200, and is matched with one end of the stirring component 201 to drive the stirring component 201.

[0047] Preferably, the first liquid inlet 100 and the second liquid inlet 101 are arranged on the top of the stirring tank 200 and communicate with the accommodating cavity 204 .

[0048] Preferably, the foam liquid outlet 102 is disposed at the bottom of the stirring tank 200 and communicated with the accommodating cavity 204 .

[0049] Preferably, the stirring assembly 201 includes a stirring shaft 205 and a plurality of stirring members 206 fixedly arranged on the stirring shaft 205. The two ends of the stirring shaft 205 respectively pass through the two sides of the stirring tank body 200 and are rotatably connected to the stirring tank body 200. The driving assembly 203 is cooperatively arranged with one end of the stirring shaft 205 for driving the stirring shaft 205 to rotate.

[0050] Preferably, four mounting planes 207 are provided at one end of the stirring shaft 205 located in the accommodating cavity 204, and the stirring member 206 includes a pair of connecting plates 208 and a stirring rod 209. The pair of connecting plates 208 are respectively arranged on both sides of the stirring shaft 205 and are coordinated with two of the mounting planes 207. The stirring rod 209 passes through one end of the pair of connecting plates 208 and is fixedly connected to the pair of connecting plates 208. The other end of the pair of connecting plates 208 is fixed by a pair of fixing bolts 210. The stirring rod 209 and the pair of fixing bolts 210 are coordinated with the other two mounting planes 207. Paddle blades 211 are fixed at both ends of the stirring rod 209.

[0051] The stirring member 206 is configured as a structure of a pair of connecting plates 208 and a stirring rod 209, and one end of the pair of connecting plates 208 is fixed by the stirring rod 209, and the other end of the pair of connecting plates 208 is fixed by a pair of fixing bolts 210, which can facilitate the installation and removal of the stirring member 206. At the same time, paddles 211 are provided at both ends of the stirring rod 209, which can facilitate the mixing and stirring of the foam stock solution and the fire water source 111 for foaming.

[0052] like Figure 8 As shown, preferably, it further includes a mounting base 60 , the mounting bracket 202 is disposed on the mounting base 60 , a mounting frame 600 is disposed on the mounting base 60 , and the mounting frame 600 is matched with the mounting bracket 202 and is located on one side of the mounting bracket 202 .

[0053] The installation base 60 can facilitate the installation of the foaming and stirring device 20 , and the installation frame 600 can facilitate the installation of the driving component 203 .

[0054] Preferably, the driving assembly 203 includes a driving motor 212 and a gear reversing box 213, which are cooperatively arranged on the mounting frame 600. The driving motor 212 is connected to one end of the stirring shaft 205 passing through the stirring tank body 200 through the gear reversing box 213, and is used to drive the stirring shaft 205 to rotate.

[0055] The gear reversing box 213 adopts a gear reversing box 213 or a gear commutator in the prior art that can realize the function of the utility model, and is used to drive the power output by the output shaft of the motor 212 to reverse, thereby driving the stirring shaft 205.

[0056] When in use, the gear reversing box 213 is driven by the driving motor 212, which in turn drives the stirring shaft 205 to rotate, thereby driving the stirring rod 209 and the paddle 211 on the stirring shaft 205 to rotate, thereby completing the mixing and foaming of the foam concentrate and the fire water source 111.

[0057] Preferably, the sprinkler device 50 can be a fire-fighting water cannon.

[0058] like Figure 1 As shown, in another embodiment, in order to further produce denser nitrogen foam, this embodiment is modified on the basis of the above embodiment, and the difference from the above embodiment is that the spray device 50 includes a spray water monitor 500 and a foam generator 501, the foam generator 501 is connected to the foam liquid output pipeline 123, and the spray water monitor 500 is connected to the foam generator 501. The spray water monitor 500 can be a fire water monitor.

[0059] Working principle of this utility model:

[0060] When in use, the foam liquid stored in the foam liquid storage tank 10 enters the foaming and stirring device 20 through the first input pipe 106 and the first liquid inlet 100, and the fire water source 111 enters the foaming and stirring device 20 through the second input pipe 110 and the second liquid inlet 101. The foam liquid and the fire water source 111 are mixed in the foaming and stirring device 20 to form foam liquid; the foam liquid enters the gas-liquid mixing device 30 through the foam liquid input pipe 115, and the nitrogen in the nitrogen storage tank 40 enters the gas-liquid mixing device 30 through the gas input pipe 119 and the gas inlet pipe 105. The nitrogen is mixed with the foam liquid through the gas-liquid mixing device 30 to form nitrogen foam. The mixed nitrogen foam enters the spraying device 50 through the foam liquid output pipe 123, and the nitrogen foam is sprayed to the fire scene through the spraying device 50 to complete the fire extinguishing.

[0061] The above-mentioned embodiments only express the specific implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A nitrogen foam fire extinguishing system, characterized in that: The invention comprises a foam stock liquid storage tank (10), a foaming stirring device (20), a gas-liquid mixing device (30), a nitrogen storage tank (40) and a spraying device (50); the foaming stirring device (20) is provided with a first liquid inlet (100), a second liquid inlet (101) and a foam liquid outlet (102); one end of the gas-liquid mixing device (30) is provided with an inlet end (103) and the other end is provided with an outlet end (104); and one side of the inlet end (103) of the gas-liquid mixing device (30) is provided with a gas inlet pipe (105); The foam stock liquid storage tank (10) is connected to the first liquid inlet (100) through a first input pipeline (106), and the first input pipeline (106) is provided with a first electromagnetic valve (107), a first metering pump (108) and a first non-return valve (109) in sequence. The second liquid inlet (101) is connected to a fire water source (111) through a second input pipeline (110), and the second input pipeline (110) is provided with a second non-return valve (112), a second metering pump (113) and a second electromagnetic valve (114) in sequence. The foam liquid outlet (102) is connected to the inlet end (103) through a foam liquid input pipeline (115), and the foam liquid input pipeline (115) is provided with a third electromagnetic valve (116), an input pump (117) and a third non-return valve (118) in sequence. The nitrogen storage tank (40) is connected to the gas inlet pipe (105) through a gas input pipeline (119), and a pressure reducing valve (120), a gas solenoid valve (121) and a gas check valve (122) are sequentially arranged on the gas input pipeline (119). The outlet end (104) is connected to the spray device (50) through a foam liquid output pipeline (123), and an output ball valve (124) and an output pump (125) are arranged on the foam liquid output pipeline (123).

2. A nitrogen foam fire extinguishing system according to claim 1, characterized in that: The gas-liquid mixing device (30) comprises an inlet portion (300), a connecting portion (301) and an outlet portion (302) which are connected in sequence. A gas-liquid flow channel (303) is provided in the inlet portion (300), the connecting portion (301) and the outlet portion (302). An air intake pipe (304) is provided on one side of the inlet portion (300). One end of the air intake pipe (304) is arranged in the gas-liquid flow channel (303) of the inlet portion (300), and the other end passes through the inlet portion (300) and is fixedly connected to the inlet portion (300). The inlet end (103) is arranged at one end of the inlet portion (300), and the outlet end (104) is arranged at one end of the outlet portion (302). The gas inlet pipe (105) is flange-connected to the end of the air intake pipe (304) passing through one end of the inlet portion (300).

3. A nitrogen foam fire extinguishing system according to claim 2, characterized in that: A mixing blocker (305) is provided in the gas-liquid mixing device (30), one end of the mixing blocker (305) is located in the connecting portion (301) and is threadedly connected to the connecting portion (301), and the other end is located in the outlet portion (302), a gas-liquid mixing flow channel (306) is provided in the mixing blocker (305), the gas-liquid mixing flow channel (306) penetrates one end of the mixing blocker (305) located in the connecting portion (301) and is connected to the gas-liquid flow channel (303), and a plurality of gas-liquid outlet grooves (307) are provided at one end of the mixing blocker (305) located in the outlet portion (302), and the plurality of gas-liquid outlet grooves (307) are connected to the gas-liquid mixing flow channel (306).

4. A nitrogen foam fire extinguishing system according to claim 1 or 3, characterized in that: The foaming and stirring device (20) comprises a stirring tank body (200), a stirring component (201), a mounting bracket (202) and a driving component (203); the stirring tank body (200) is arranged on the mounting bracket (202); a containing cavity (204) is arranged in the stirring tank body (200); the stirring component (201) is arranged in the containing cavity (204) and has two ends passing through the stirring tank body (200); the stirring component (201) is rotatably connected to the stirring tank body (200); and the driving component (203) is arranged on one side of the stirring tank body (200) and is arranged in cooperation with one end of the stirring component (201) for driving the stirring component (201).

5. A nitrogen foam fire extinguishing system according to claim 4, characterized in that: The first liquid inlet (100) and the second liquid inlet (101) are arranged at the top of the stirring tank (200) and are in communication with the containing cavity (204).

6. A nitrogen foam fire extinguishing system according to claim 5, characterized in that: The foam liquid outlet (102) is arranged at the bottom of the stirring tank (200) and is communicated with the containing cavity (204).

7. A nitrogen foam fire extinguishing system according to claim 6, characterized in that: The stirring assembly (201) comprises a stirring shaft (205) and a plurality of stirring members (206) fixedly arranged on the stirring shaft (205); two ends of the stirring shaft (205) respectively penetrate two sides of the stirring tank body (200) and are rotatably connected to the stirring tank body (200); and a driving assembly (203) is arranged in cooperation with one end of the stirring shaft (205) for driving the stirring shaft (205) to rotate.

8. A nitrogen foam fire extinguishing system according to claim 7, characterized in that: One end of the stirring shaft (205) located in the accommodating cavity (204) is provided with four mounting planes (207); the stirring member (206) comprises a pair of connecting plates (208) and a stirring rod (209); the pair of connecting plates (208) are respectively arranged on both sides of the stirring shaft (205) and are arranged in cooperation with two of the mounting planes (207); the stirring rod (209) passes through one end of the pair of connecting plates (208) and is fixedly connected to the pair of connecting plates (208); the other end of the pair of connecting plates (208) is fixed by a pair of fixing bolts (210); the stirring rod (209) and the pair of fixing bolts (210) are arranged in cooperation with the other two mounting planes (207); and paddles (211) are fixedly arranged at both ends of the stirring rod (209).

9. A nitrogen foam fire extinguishing system according to claim 8, characterized in that: It also includes a mounting base (60), the mounting bracket (202) is arranged on the mounting base (60), a mounting frame (600) is arranged on the mounting base (60), and the mounting frame (600) is arranged in coordination with the mounting bracket (202) and is located on one side of the mounting bracket (202).

10. A nitrogen foam fire extinguishing system according to claim 9, characterized in that: The driving assembly (203) comprises a driving motor (212) and a gear reversing box (213). The driving motor (212) and the gear reversing box (213) are cooperatively arranged on the mounting frame (600). The driving motor (212) is connected to one end of the stirring shaft (205) penetrating the stirring tank body (200) through the gear reversing box (213) to drive the stirring shaft (205) to rotate.

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