A foam fire extinguishing device with air-liquid premixing type for micro fire truck with compressed air source

Abstract

The application discloses a foam fire extinguishing device with air-liquid premixing type and compressed air source for a micro fire truck, and relates to the technical field of fire-fighting equipment. The foam fire extinguishing device comprises a box body, a foam agent storage cylinder, a pre-pressing cylinder, a pressure compensation pushing electric cylinder and a pressure increasing assembly. The foam agent storage cylinder is provided with an installation inner recess chamber, and the pressure increasing assembly is installed in the installation inner recess chamber, so that noise is reduced and space is saved. The pressure increasing assembly drives a plurality of permanent magnetic pushing columns and a pressure increasing piston to reciprocate through a plurality of electromagnetic driving sleeves, compressed air is generated, and the compressed air is input into the pre-pressing cylinder through a pressure guide pipe, a converging pressure pipe and a tee pipe. The pre-pressing cylinder is used for pressure accumulation and pressure stabilization, and the pressure compensation pushing electric cylinder can push a pressure compensation piston plate to rapidly compensate pressure. Compressed gas enters the foam agent storage cylinder through a pressure delivery pipe, pushes foam agent mixed liquid to be sprayed out, and fire extinguishing is realized.

Description

Technical Field

[0001] This invention relates to the field of fire-fighting equipment technology, specifically to a gas-liquid premixed foam fire extinguishing device with a built-in compressed air source for a mini fire truck. Background Technology

[0002] Existing mini fire trucks, limited by their size, load capacity, and internal installation space, typically cannot be equipped with large compressed air cylinders, air compressors, or complex mechanical supercharging transmission mechanisms. If a pre-pressurized air tank is used as the power source for foam spraying, the tank remains pressurized for extended periods when the vehicle is parked in high-temperature environments or traveling on bumpy roads, posing a safety hazard. If a regular small compressor is used for temporary air supply, the arrival time of the mini fire truck at the fire scene is uncertain. When the fire source is close, the compressor has limited time to build up pressure, which can lead to insufficient spray pressure in the foam mixture, affecting initial fire extinguishing efficiency.

[0003] When ordinary air is directly used as compressed gas into the foaming agent storage container, dust, fibers, and particulate impurities in the air may enter the pressurization piston chamber, causing piston wear, jamming, or poor sealing of the one-way valve, affecting the long-term reliability of the device. At the same time, ordinary air contains a high proportion of oxygen. While its main function is to provide propulsion when compressed gas propels the foaming agent mixture towards the ignition source, a high oxygen content may adversely affect the combustion environment near the ignition source. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides the following technical solution: a gas-liquid premixed foam fire extinguishing device with a built-in compressed air source for a mini fire truck, comprising a housing, a foam agent storage cylinder disposed inside the housing, and a pressurizing air supply mechanism disposed on the foam agent storage cylinder; the foam agent storage cylinder is provided with an installation recess recessed into the foam agent storage cylinder, and the pressurizing air supply mechanism is disposed within the installation recess; the pressurizing air supply mechanism includes a shell fixedly installed within the installation recess, and a pre-compression cylinder, a pressure compensation push cylinder, and a mounting base are fixedly installed within the shell via support ribs; a pressure-controlled pressure device is provided in the pre-compression cylinder via a sliding seal. A pressure compensation piston plate is fixedly connected to the end of the telescopic rod of a pressure compensation push cylinder, which is used to push the pressure compensation piston plate to compress the gas in the pre-compression cylinder. The pre-compression cylinder is equipped with a pressure discharge nozzle and a pressure inlet nozzle. Two pressure boosting components are installed in the mounting base, and both pressure boosting components are connected to the pressure inlet nozzle through a three-way pipe. A pressure delivery pipe is fixedly connected to the pressure discharge nozzle. The pressure delivery pipe passes through the mounting recess and extends to the top of the inner wall of the foaming agent storage cylinder, and is used to deliver compressed gas into the foaming agent storage cylinder. A loading and unloading pipe is provided at the bottom of the foaming agent storage cylinder, and a valve is provided at the end of the loading and unloading pipe.

[0005] Preferably, both the pressure discharge nozzle and the pressure inlet nozzle are equipped with one-way valves; the one-way valve in the pressure inlet nozzle is used to allow the gas output from the pressurization component to enter the pre-pressurization cylinder in one direction, and the one-way valve in the pressure discharge nozzle is used to allow the compressed gas in the pre-pressurization cylinder to enter the pressure delivery pipe in one direction, so as to avoid the backflow of gas pressure in the foaming agent storage cylinder.

[0006] Preferably, the end of the housing away from the pressure outlet forms an air intake end, and an air filter and a carbon molecular sieve are fixedly installed on the air intake end; the air filter is located on the outside, and the carbon molecular sieve is located between the air filter and the housing, so that the outside air first passes through the air filter to remove dust and particulate impurities, and then passes through the carbon molecular sieve to adsorb and filter the oxygen in the air, thereby reducing the oxygen content of the gas entering the pressurization component.

[0007] Preferably, the booster assembly includes a booster seat and an electromagnetic drive sleeve bracket, which are fixedly fitted to the inner wall of the mounting base. The booster seat has multiple booster piston chambers arranged in a rectangular array, each chamber containing a slidably sealed booster piston. Each booster piston chamber has an exhaust port and an intake port at its bottom. An exhaust pipe connects to the exhaust port, and an intake pipe connects to the intake port. Both the exhaust pipe and the intake pipe are equipped with one-way valves. The intake pipe draws in air treated by an air filter and a carbon molecular sieve, and the exhaust pipe discharges compressed air from the booster piston chamber.

[0008] Preferably, all exhaust pipes on each of the booster components are connected to pressure guide pipes, the pressure guide pipes are connected to manifold pressure pipes, and the manifold pressure pipes are connected to tee pipes; multiple rows of exhaust pipes are provided on the same booster component, each row of exhaust pipes is connected to a corresponding pressure guide pipe, and multiple pressure guide pipes are connected to the manifold pressure pipes together to collect the compressed air discharged from multiple booster piston chambers and deliver it to the pre-compression cylinder.

[0009] Preferably, the electromagnetic drive sleeve bracket has the same number of electromagnetic drive sleeves as the pressurizing piston chamber, and a permanent magnet push column is slidably inserted into the axial center of each electromagnetic drive sleeve; each permanent magnet push column is coaxially fixed with the corresponding pressurizing piston. The electromagnetic drive sleeve is used to generate an axially changing magnetic field after a periodically changing current is applied, and the axially changing magnetic field drives the permanent magnet push column to reciprocate along the axial direction of the electromagnetic drive sleeve, thereby driving the pressurizing piston to reciprocate and compress air in the pressurizing piston chamber.

[0010] Preferably, the permanent magnet push column and the electromagnetic drive sleeve are in a clearance fit, and lubricating oil is provided at their mating surfaces to reduce the frictional resistance of the permanent magnet push column during reciprocating motion and to reduce mechanical wear between the electromagnetic drive sleeve and the permanent magnet push column.

[0011] Preferably, the housing is fixedly installed on the mini fire truck, and the side of the housing is provided with an openable maintenance door panel, which is provided with a breathable mesh screen; after the maintenance door panel is closed on the housing, the position of the maintenance door panel corresponds to the position of the installation recess, so that external air can enter the area where the installation recess is located through the breathable mesh screen and be drawn in by the pressurization component.

[0012] Preferably, the top of the foaming agent storage cylinder is provided with an exhaust nozzle, and a valve is provided at the exhaust nozzle; the exhaust nozzle is used to discharge the original gas in the foaming agent storage cylinder when foaming agent mixture is injected into the foaming agent storage cylinder, and the loading and unloading pipe is used to inject foaming agent mixture into the foaming agent storage cylinder and to connect to the fire extinguishing nozzle during fire extinguishing.

[0013] Compared with the prior art, the present invention has the following advantages: (1) The present invention sets the outer shell in the recessed installation chamber of the foam agent storage cylinder, so that the noise and vibration generated by the pressurizing component during operation can be absorbed and weakened by the foam agent storage cylinder and the foam agent mixture inside. Compared with the structure in which the pressurizing component is directly exposed, this arrangement saves the internal space of the box and reduces the operating noise, which is beneficial for the deployment and on-site use of mini fire trucks in narrow spaces; (2) The present invention sets a pre-pressurization cylinder between the foam agent storage cylinder and the pressurizing component. The compressed gas output by the pressurizing component first enters the pre-pressurization cylinder to collect and equalize the pressure, and then enters the foam agent storage cylinder through the pressure delivery pipe. This can buffer the pressure pulsation generated by the reciprocating motion of multiple booster pistons, making the air pressure rise in the foam agent storage cylinder more stable, reducing the problems of inconsistent foam spray, intermittent spraying, and unstable spray distance; (3) The present invention is equipped with a pressure compensation push cylinder and a pressure compensation piston plate. When the mini fire truck is close to the fire source and the preparation time is short, the pressure compensation push cylinder can push the pressure compensation piston plate to compress the gas in the pre-compression cylinder, accelerating the pressure build-up speed in the pre-compression cylinder. This can make up for the problem of insufficient working time of the booster component, so that the device can still quickly form foam spray pressure in the short distance rapid arrival scenario, improving the initial fire extinguishing response capability; (4) The present invention adopts multiple booster piston chambers and multiple booster pistons arranged in parallel. Each booster piston is only responsible for compressing a small volume of air, and the corresponding electromagnetic drive sleeve only needs to output a small magnetic force to complete the drive. Multiple small booster units work simultaneously or alternately and then collect compressed air at the pressure guide pipe and the manifold pressure pipe to achieve an overall boosting effect by superimposing the quantity, thereby reducing the power, heat generation and structural volume of a single drive component; (5) In this invention, an air filter and a carbon molecular sieve are sequentially set at the air inlet end of the outer shell. The air filter first intercepts dust, fibers and particulate impurities, reducing the impurities from entering the booster piston chamber and causing piston wear, jamming or poor sealing of the one-way valve; the carbon molecular sieve further reduces the oxygen content of the incoming gas, making the compressed gas entering the foam agent storage cylinder more suitable for fire extinguishing spray scenarios and reducing the combustion-supporting effect on the fire source. Attached Figure Description

[0014] Figure 1 This is an installation diagram of the present invention mounted on a mini fire truck.

[0015] Figure 2 This is a schematic diagram of the box structure of the present invention.

[0016] Figure 3 This is a schematic diagram of the foaming agent storage cylinder structure of the present invention.

[0017] Figure 4 This is a schematic diagram of the internal structure of the outer shell of the present invention.

[0018] Figure 5 This is a schematic diagram of the pre-compression cylinder structure of the present invention.

[0019] Figure 6 This is a schematic diagram showing the installation location of the booster component of the present invention.

[0020] Figure 7 This is a schematic diagram of the booster assembly structure of the present invention.

[0021] Figure 8 This is a cross-sectional view of the booster assembly structure of the present invention.

[0022] Figure 9 For the present invention Figure 8 Schematic diagram of the structure at point A in the middle.

[0023] In the diagram: 101-Outer shell; 102-Pre-compression cylinder; 103-Pressure discharge nozzle; 104-Pressure inlet nozzle; 105-T-connector; 106-Support rib; 107-Pressure compensation actuator; 108-Pressure compensation piston plate; 109-Mounting base; 110-Pressure delivery pipe; 111-Exhaust nozzle; 112-Loading / unloading pipe; 113-Installation recess; 114-Carbon molecular sieve; 115-Air filter element; 116-Foaming agent storage. Cylinder; 201-Boosting base; 202-Boosting piston; 203-Boosting piston chamber; 204-Permanent magnet push column; 205-Electromagnetic drive sleeve bracket; 206-Electromagnetic drive sleeve; 207-Pressure guide pipe; 208-Combination pressure pipe; 209-Exhaust port; 210-Air inlet; 211-Exhaust pipe; 212-Air inlet pipe; 301-Box body; 302-Maintenance door panel; 303-Ventilable screen; 304-Mini fire truck. Detailed Implementation

[0024] The following is in conjunction with the appendix Figures 1-9 The technical solution of the present invention will be further illustrated through specific embodiments.

[0025] This invention provides a gas-liquid premixed foam fire extinguishing device with a built-in compressed air source for a mini fire truck. It includes a foam agent storage cylinder 116 installed inside a housing 301. The foam agent storage cylinder 116 has a recessed mounting chamber 113 (the noise from the pressurizing component can be effectively absorbed by the foam agent storage cylinder 116 and its internal liquid, reducing operating noise). A housing 101 is fixedly installed inside the mounting chamber 113. A pre-compression cylinder 102, a pressure-compensating electric cylinder 107, and a mounting base 109 are fixedly installed inside the housing 101 via supporting ribs 106. The inner wall of the pre-compression cylinder 102 is provided with a sliding seal. A pressure-compensating piston plate 108 is provided, which is fixedly installed at the end of the telescopic rod of the pressure-compensating push cylinder 107 (there are at least three pressure-compensating push cylinders 107); the pre-compression cylinder 102 is also provided with a pressure discharge nozzle 103 and a pressure inlet nozzle 104; two pressure boosting components are provided inside the mounting base 109, and the two pressure boosting components are connected to the pressure inlet nozzle 104 through a three-way pipe 105; a pressure delivery pipe 110 is fixedly connected to the pressure discharge nozzle 103, and the pressure delivery pipe 110 extends through the mounting recess 113 to the top of the inner wall of the foaming agent storage cylinder 116; a loading and unloading pipe 112 is provided at the bottom of the foaming agent storage cylinder 116, and a valve is provided at the end of the loading and unloading pipe 112. Both the pressure discharge nozzle 103 and the pressure inlet nozzle 104 are provided with one-way valves to guide the directional flow of gas at the pressure discharge nozzle 103 and the pressure inlet nozzle 104. A carbon molecular sieve 114 and an air filter element 115 are fixedly installed at the end of the housing 101 away from the pressure relief nozzle 103, wherein the carbon molecular sieve 114 is disposed between the air filter element 115 and the housing 101.

[0026] The booster assembly includes a booster seat 201 fixedly fitted to the inner wall of the mounting base 109 and an electromagnetic drive sleeve bracket 205. The booster seat 201 has multiple booster piston chambers 203 arranged in a rectangular array (the rectangular array can accommodate more booster piston chambers 203). Each booster piston chamber 203 has a booster piston 202 slidably sealed on its inner wall. Each booster piston chamber 203 has an exhaust port 209 and an air inlet 210 at its bottom. An exhaust pipe 211 and an air inlet pipe 212 are fixedly connected to the exhaust port 209 and air inlet 210, respectively. A one-way valve is installed in both the exhaust pipe 211 and the air inlet pipe 212. All exhaust pipes 211 on each booster assembly are connected to a pressure guide pipe 207, which is connected to a three-way pipe 105 via a manifold pressure pipe 208. Each booster assembly has multiple rows of exhaust pipes 211, and each row of exhaust pipes 211 corresponds to a pressure guide pipe 207. All pressure guide pipes 207 on the booster assembly are connected to the manifold pressure pipe 208. The same number of electromagnetic drive sleeves 206 as the booster piston chamber 203 are fixedly installed inside the electromagnetic drive sleeve bracket 205. A permanent magnet push column 204 that magnetically engages with the electromagnetic drive sleeve 206 is slidably inserted at the axial position of each electromagnetic drive sleeve 206. Each permanent magnet push column 204 is coaxially fixed with the corresponding booster piston 202.

[0027] The electromagnetic drive sleeve 206 is an axial electromagnetic drive component mounted on the electromagnetic drive sleeve bracket 205, and has a coil structure inside or circumferentially positioned therein. The permanent magnet push column 204 is slidably inserted into the axial center of the electromagnetic drive sleeve 206, and is coaxially fixed with the corresponding booster piston 202. When current is applied to the electromagnetic drive sleeve 206, it generates a magnetic field in its axial direction. This magnetic field interacts with the magnetic field of the permanent magnet push column 204, thereby generating an axial thrust or pull force on the permanent magnet push column 204. In actual operation, the electromagnetic drive sleeve 206 can generate a periodically changing axial magnetic field by controlling the direction, duration, or magnitude of the current applied. When the direction or intensity of the magnetic field changes, the direction and magnitude of the magnetic force on the permanent magnet push column 204 also change, allowing the permanent magnet push column 204 to reciprocate axially at the axial center of the electromagnetic drive sleeve 206. Since the permanent magnet push column 204 is coaxially fixed with the booster piston 202, the reciprocating motion of the permanent magnet push column 204 directly drives the booster piston 202 to slide back and forth within the booster piston chamber 203. Because multiple booster pistons 202 and multiple booster piston chambers 203 are arranged in parallel, each booster piston 202 is only responsible for compressing a small volume of air. The corresponding electromagnetic drive sleeve 206 only needs to output a small magnetic force to complete the drive, eliminating the need for a high-power single electromagnetic drive component. After multiple small booster units work simultaneously or alternately, the compressed air converges at the pressure guide pipe 207 and the manifold pressure pipe 208, achieving an overall boosting effect through the superposition of their numbers. This structure reduces the power requirement and heat generation of a single drive component and also helps to reduce the size of the booster assembly, making it suitable for installation and use in the confined space of a miniature fire truck.

[0028] The use of electromagnetic drive sleeve 206 and permanent magnet push column 204 to drive booster piston 202 eliminates the need for additional complex transmission mechanisms such as crank, connecting rod, and cam, reducing the number of mechanical transmission components and making the booster assembly more compact, suitable for installation in the limited on-board space of mini fire truck 304; the start-stop and drive frequency of electromagnetic drive sleeve 206 can be adjusted electronically, making it easy to adjust the booster speed according to the pressure changes in pre-compression cylinder 102.

[0029] The housing 301 is fixedly mounted on the mini fire truck 304. A maintenance door 302, which can be opened, is provided on the side of the housing 301. A breathable mesh screen 303 is installed on the maintenance door 302. When the maintenance door 302 is closed on the housing 301, its position is aligned with the recessed mounting chamber 113. An exhaust nozzle 111 is provided on the top of the foam agent storage cylinder 116, and a valve is installed at the exhaust nozzle 111.

[0030] To use, open the maintenance door 302, then connect the pipe to the loading / unloading pipe 112. Open both the vent 111 and the valves at the loading / unloading pipe 112, then inject the foaming agent mixture into the foaming agent storage tank 116 until the desired liquid level is reached. Then close both the valves at the loading / unloading pipe 112 and the vent 111, and finally close the maintenance door 302. Since there is no pre-stored pressure in the foaming agent storage tank 116 and the pre-pressurization tank 102, there is no risk of explosion due to pre-stored pressure under high external temperatures and bumpy road conditions. During fire extinguishing, the electromagnetic drive sleeve 206 in the pressurization assembly is activated. The electromagnetic drive sleeve 206 generates magnetic force, driving the permanent magnet push column 204 to reciprocate (the permanent magnet push column 204 and the electromagnetic drive sleeve 206 are in clearance fit, and the mating surfaces are lubricated). The permanent magnet push column 204 drives the pressurization piston 202 to reciprocate within the pressurization piston chamber 203. As the pressurization piston 202 reciprocates, the cavity volume inside the pressurization piston chamber 203 continuously increases and decreases, resulting in pressurization. The pressure inside the piston chamber 203 changes. When the pressure inside the booster piston chamber 203 decreases, external air is drawn into the booster piston chamber 203 through the intake pipe 212. (The end of the outer casing 101 furthest from the exhaust port 103 serves as the intake end of the booster assembly. The air filter 115 and the carbon molecular sieve 114 are both located at this intake end, with the carbon molecular sieve 114 positioned between the air filter 115 and the outer casing 101. With this arrangement, external air must pass through the air filter 115 before entering the inner casing 101.) Air filter 115 intercepts dust, fibers, and particulate impurities in the air, preventing them from entering the booster piston chamber 203 and causing wear, jamming, or poor sealing of the one-way valve. The pre-filtered air then passes through carbon molecular sieve 114, which adsorbs and filters oxygen, reducing the oxygen content of the gas entering the booster assembly. The treated gas is then drawn into the booster piston chamber 203 through intake pipe 212. The compressed gas entering the foaming agent storage cylinder 116... The reduced oxygen content reduces the combustion-supporting effect when sprayed near the fire source, making the foam agent mixture more suitable for fire extinguishing scenarios when pushed out by compressed gas. At this time, the one-way valve inside the exhaust pipe 211 prevents air flow at the exhaust pipe 211. When the pressure inside the booster piston chamber 203 increases, the air drawn into the booster piston chamber 203 is pushed out. At this time, the air enters the pressure guide pipe 207 through the exhaust pipe 211. At this time, the one-way valve set in the intake pipe 212 prevents air flow at the intake pipe 212.Finally, the pressurized air is guided into the pre-compression cylinder 102 through the manifold pressure pipe 208, the tee pipe 105, and the pressure inlet 104, creating pre-pressure inside the pre-compression cylinder 102. The pressure is then guided through the pressure outlet 103 and the pressure delivery pipe 110 to the foam agent storage cylinder 116, creating air pressure inside the foam agent storage cylinder 116. This process continues until the mini fire truck 304 arrives at the fire scene. If the fire source is close, the mini fire truck 304 will have a short travel distance and preparation time. In this case, the pressure compensation actuator 107 needs to be activated. The extension rod of the pressure compensation actuator 107 drives the pressure compensation piston plate 108 to press into the pre-compression cylinder 102, increasing the pressure inside the pre-compression cylinder 102 at a faster rate to compensate for the insufficient pressurization time of the pressurization component. The pre-compression cylinder 102 is equipped with a pressure sensor to determine the internal air pressure and select whether to activate the pressure compensation actuator 107 for pressure compensation. If the pressure is within the required range, the actuator 107 does not need to be activated. If the fire source is far away, the mini fire truck 304 will have a longer travel distance and sufficient preparation time, so the actuator 107 does not need to be activated, and the pressurization component has enough time to pressurize the pre-compression cylinder 102 to the required pressure value. Finally, the fire extinguishing nozzle is connected to the loading and unloading pipe 112, and the fire extinguishing foam is sprayed out from the loading and unloading pipe 112 under the pressure inside the foam agent storage tank 116 (the valve needs to be opened), spraying the foam onto the fire source to extinguish the fire. The purpose of setting up the pre-compression cylinder 102 is to pre-store pressure, ensuring a continuous and stable supply of air pressure from the pressure delivery pipe 110 to the foam agent storage tank 116, and preventing discontinuous air pressure caused by directly connecting the pressurization component to the inside of the foam agent storage tank 116. The pre-compression cylinder 102 is not simply a connecting pipe, but rather an intermediate pressure storage, stabilization, and replenishment structure located between the pressurizing assembly and the foaming agent storage cylinder 116. Since the pressurizing piston 202 in the pressurizing assembly is a reciprocating component, a single pressurizing piston chamber 203 will exhibit periodic pressure changes during intake and exhaust. Even if multiple pressurizing piston chambers 203 operate simultaneously, pressure pulsations may occur. If the pressurizing assembly is directly connected to the foaming agent storage cylinder 116, compressed air will enter the foaming agent storage cylinder 116 intermittently or in a fluctuating manner, easily leading to unstable pressure build-up within the foaming agent storage cylinder 116, thus affecting the continuity of the subsequent foaming agent mixture sprayed from the loading / unloading pipe 112. Therefore, a pre-compression cylinder 102 is installed between the pressurizing assembly and the foaming agent storage cylinder 116. The compressed air generated by the pressurizing assembly first enters the pre-compression cylinder 102 through the tee pipe 105 and the inlet nozzle 104, forming a certain pre-stored pressure within the pre-compression cylinder 102. The pre-compression cylinder 102 buffers the pulsating airflow discharged from the pressurization assembly, allowing the gas discharged from multiple pressurization piston chambers 203 to first converge and equalize within the pre-compression cylinder 102 before being continuously delivered to the foam agent storage cylinder 116 via the pressure discharge nozzle 103 and the pressure delivery pipe 110. This ensures a more stable pressure rise within the foam agent storage cylinder 116, preventing issues such as fluctuating pressure, intermittent spraying, or unstable spray distance during foam agent mixture injection. Simultaneously, the pressure compensation piston plate 108 and pressure compensation actuator 107 can compensate for insufficient pre-compression time, ultimately achieving continuity and stability in the fire extinguishing foam injection.

Claims

1. A gas-liquid premixed foam fire extinguishing device with a built-in compressed air source for a mini fire truck, characterized in that: It includes a housing (301), a foaming agent storage cylinder (116) disposed inside the housing (301), and a pressurized gas supply mechanism disposed on the foaming agent storage cylinder (116); The foaming agent storage cylinder (116) is provided with an installation recess (113) that is recessed into the inside of the foaming agent storage cylinder (116), and the pressurized air supply mechanism is provided in the installation recess (113). The pressurized air supply mechanism includes an outer shell (101) fixedly installed in the mounting recess (113). A pre-pressurization cylinder (102), a pressure compensation push electric cylinder (107), and a mounting base (109) are fixedly installed in the outer shell (101) through a support rib (106). The pre-compression cylinder (102) is provided with a sliding seal pressure compensation piston plate (108). The pressure compensation piston plate (108) is fixedly connected to the end of the telescopic rod of the pressure compensation push cylinder (107). The pressure compensation push cylinder (107) is used to push the pressure compensation piston plate (108) to compress the gas in the pre-compression cylinder (102). The pre-compression cylinder (102) is provided with a pressure discharge nozzle (103) and a pressure inlet nozzle (104). The mounting base (109) is provided with two pressure boosting components. Both pressure boosting components are connected to the pressure inlet nozzle (104) through a three-way pipe (105). A pressure delivery pipe (110) is fixedly connected to the pressure discharge nozzle (103). The pressure delivery pipe (110) passes through the installation recess (113) and extends to the top of the inner wall of the foaming agent storage cylinder (116) for delivering compressed gas into the foaming agent storage cylinder (116). The bottom of the foaming agent storage cylinder (116) is provided with a loading and unloading pipe (112), and a valve is provided at the end of the loading and unloading pipe (112).

2. The gas-liquid premixed foam fire extinguishing device with a built-in compressed air source for a mini fire truck according to claim 1, characterized in that: Both the pressure discharge nozzle (103) and the pressure inlet nozzle (104) are equipped with one-way valves; The one-way valve in the inlet nozzle (104) is used to allow the gas output from the pressurization component to enter the pre-pressurization cylinder (102) in one direction, and the one-way valve in the outlet nozzle (103) is used to allow the compressed gas in the pre-pressurization cylinder (102) to enter the pressure delivery pipe (110) in one direction, so as to avoid the backflow of gas pressure in the foaming agent storage cylinder (116).

3. The gas-liquid premixed foam fire extinguishing device with a built-in compressed air source for a mini fire truck according to claim 1, characterized in that: The end of the outer shell (101) away from the pressure outlet (103) forms an air inlet, and an air filter (115) and a carbon molecular sieve (114) are fixedly installed on the air inlet. The air filter (115) is located on the outside, and the carbon molecular sieve (114) is located between the air filter (115) and the outer shell (101). This allows the outside air to pass through the air filter (115) to remove dust and particulate impurities, and then pass through the carbon molecular sieve (114) to adsorb and filter the oxygen in the air, thereby reducing the oxygen content of the gas entering the pressurization assembly.

4. A gas-liquid premixed foam fire extinguishing device with a built-in compressed air source for a mini fire truck according to claim 3, characterized in that: The booster assembly includes a booster seat (201) and an electromagnetic drive sleeve bracket (205), which are fixedly fitted to the inner wall of the mounting base (109). The pressurizing seat (201) has multiple pressurizing piston chambers (203) arranged in a rectangular array, and each pressurizing piston chamber (203) is provided with a pressurizing piston (202) in a sliding seal. Each of the pressurized piston chambers (203) has an exhaust port (209) and an air inlet (210) at its bottom. An exhaust pipe (211) is connected to the exhaust port (209), and an air inlet pipe (212) is connected to the air inlet (210). A one-way valve is provided in both the exhaust pipe (211) and the air inlet pipe (212). The intake pipe (212) is used to draw in air that has been treated by the air filter (115) and the carbon molecular sieve (114), and the exhaust pipe (211) is used to discharge the compressed air in the booster piston chamber (203).

5. A gas-liquid premixed foam fire extinguishing device with a built-in compressed air source for a mini fire truck according to claim 4, characterized in that: All exhaust pipes (211) on each of the aforementioned booster components are connected to pressure guide pipes (207), which are connected to manifold pressure pipes (208), which are connected to tee pipes (105); Multiple exhaust pipes (211) are provided on the same booster assembly. Each exhaust pipe (211) is connected to a pressure guide pipe (207). Multiple pressure guide pipes (207) are connected to a manifold pressure pipe (208) to collect the compressed air discharged from multiple booster piston chambers (203) and deliver it to the pre-compression cylinder (102).

6. A gas-liquid premixed foam fire extinguishing device with a built-in compressed air source for a mini fire truck according to claim 4, characterized in that: The electromagnetic drive sleeve bracket (205) is fixedly installed with the same number of electromagnetic drive sleeves (206) as the pressurizing piston chamber (203), and a permanent magnet push column (204) is slidably inserted into the axial position of each electromagnetic drive sleeve (206). Each of the permanent magnet push column (204) is coaxially fixed with the corresponding booster piston (202). The electromagnetic drive sleeve (206) is used to generate an axially changing magnetic field after a periodically changing current is applied, and the axially changing magnetic field drives the permanent magnet push column (204) to reciprocate along the axial direction of the electromagnetic drive sleeve (206), thereby driving the booster piston (202) to reciprocate and compress air in the booster piston chamber (203).

7. A gas-liquid premixed foam fire extinguishing device with a built-in compressed air source for a mini fire truck according to claim 6, characterized in that: The permanent magnet push column (204) and the electromagnetic drive sleeve (206) are in clearance fit, and lubricating oil is provided at the mating surface of the two to reduce the frictional resistance of the permanent magnet push column (204) during reciprocating motion and reduce the mechanical wear between the electromagnetic drive sleeve (206) and the permanent magnet push column (204).

8. A gas-liquid premixed foam fire extinguishing device with a built-in compressed air source for a mini fire truck according to claim 1, characterized in that: The box (301) is fixedly installed on the mini fire truck (304). The side of the box (301) is provided with an openable maintenance door (302), and the maintenance door (302) is provided with a breathable mesh (303). After the maintenance door panel (302) is closed on the housing (301), the position of the maintenance door panel (302) corresponds to the position of the installation recess (113), so that external air can enter the area where the installation recess (113) is located through the breathable mesh (303) and be drawn in by the pressurization component.

9. A gas-liquid premixed foam fire extinguishing device with a built-in compressed air source for a mini fire truck according to claim 1, characterized in that: The top of the foaming agent storage cylinder (116) is provided with an exhaust nozzle (111), and a valve is provided at the exhaust nozzle (111); The vent (111) is used to discharge the original gas in the foam agent storage cylinder (116) when foam agent mixture is injected into the foam agent storage cylinder (116), and the loading and unloading pipe (112) is used to inject foam agent mixture into the foam agent storage cylinder (116) and to connect to the fire extinguishing nozzle during fire extinguishing.

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