Switching device for fire extinguishing agent

Abstract

The invention belongs to the technical field of fire extinguishing apparatuses, and particularly relates to a switching device for a fire extinguishing agent. The device mainly comprises an outer cylinder, an inner cylinder, a liquid phase pipeline and a foam branch, the outer cylinder is divided into a front separated cylinder body and a rear separated cylinder body which are connected through a soft telescopic pipe, and a foam extinguishing agent is stored in the outer cylinder; the inner cylinder is inserted from the rear end opening of the outer cylinder; the rear separation barrel can slide back and forth on the outer side wall surface of the inner barrel; a liquid phase pipeline is respectively inserted from the outer cylinder and the inner cylinder; wherein the liquid-phase pipelines can be telescopically adjusted along with the movement of the separation barrel, so that the two liquid-phase pipelines can be butted and separated; the foam branch is arranged between the outer cylinder and a liquid phase pipeline of the outer cylinder, and a valve is arranged on the liquid phase pipeline; the inner cylinder is also provided with an air inlet connected with an external air pump; a foam extinguishing agent is arranged in the outer cylinder, and foam can be instantly generated for emergency fire extinguishing after switching; when a firefighter extinguishes a fire, the fire extinguishing agent can be flexibly switched according to the type of a fire source on a fire scene and the type of surrounding combustible materials, and fire extinguishing and rescue actions are carried out.

Description

Technical Field

[0001] The invention belongs to the technical field of fire-fighting equipment, and in particular relates to a switching device for a fire-extinguishing agent. Background Art

[0002] In recent years, the lithium battery industry has achieved vigorous development. A large number of lithium batteries have been used in emerging technology industries such as electric passenger vehicles and energy storage power stations, contributing to the low-carbon and green transformation of the global economy. With the vigorous development of the lithium battery industry, its fire safety has become one of the pain points restricting the development of the industry. Lithium batteries are prone to thermal runaway under external impact, heat, overcharging and other factors. The progress of thermal runaway is often accompanied by a large amount of smoke and heat emissions, which can easily induce large-scale combustion. Lithium battery fires are difficult to extinguish and have a high risk of re-ignition. In the process of fighting lithium battery fires, the internationally common practice is to use a large amount of water for cooling. Existing studies have shown that compressed air foam can also play a role in extinguishing lithium battery fires. The use of compressed air foam is a more water-saving fire extinguishing method, especially in the face of large fires or fires with poor water supply conditions. This advantage will be more prominent. Therefore, the flexible switching of water / foam fire extinguishing agents is of great significance to improving the efficiency of fighting lithium battery fires.

[0003] Regarding the switching device of the fire extinguishing agent, the switching device of the water / foam fire extinguishing agent is mainly used. The patent (application number: 202322592099.6) provides two fire extinguishing agent cylinders and two gun heads, and realizes the switching of foam fire extinguishing agent and water through pipeline switching; the patent (application number: 201320020284.1) provides the use of negative pressure suction foaming generated by the jet, and when the negative pressure suction valve is closed, the water jet can be realized, thereby realizing the switching of the two fire extinguishing agents. The existing technical solutions require the use of two fire extinguishing agent nozzles and different pipeline systems, or the foaming is carried out by the negative pressure suction generated by the foam mixed liquid jet. The whole system is relatively complicated, and the foaming effect of the negative pressure suction foaming is poor. The quality of the foam often has a great impact on its fire extinguishing effect. Therefore, in order to solve the above problems, the present invention provides a positive pressure foam / water switching device based on compressed air. The device shares a set of pipeline systems, reduces the complexity of the system, improves the foaming effect, and helps to improve the efficiency of firefighting and rescue personnel in complex scenes. Summary of the invention

[0004] The object of the present invention is to provide a switching device which is easy to operate and can quickly switch between water / foam fire extinguishing agents.

[0005] The fire extinguishing agent switching device provided by the present invention comprises an outer cylinder, an inner cylinder, a liquid phase main pipeline, a foam branch pipeline, a liquid phase rear pipeline and a fixed bracket; The outer cylinder has a closed front end and an open rear end, and is divided into a front and rear separation cylinder, which are connected by a soft telescopic tube, and the distance between the front and rear separation cylinders can be adjusted as the soft telescopic tube is extended and contracted; the outer cylinder stores a foam fire extinguishing agent; The inner cylinder is inserted into the rear end opening of the outer cylinder in a sealed manner, and the rear end of the inner cylinder is exposed from the outer cylinder; the inner cavity of the inner cylinder and the inner cavity of the outer cylinder are connected; the rear separation cylinder can slide back and forth on the outer wall surface of the inner cylinder; The liquid phase main pipeline is inserted into the outer cylinder from the front end of the front separation cylinder and is fixedly connected to the front separation cylinder; the liquid phase rear pipeline is inserted from the rear end of the inner cylinder and is fixedly connected to the inner cylinder; the external port of the liquid phase main pipeline is connected to the fire sprinkler, and the external port of the liquid phase rear pipeline is connected to the external water pump; A soft telescopic tube is provided in the middle section of the liquid phase main pipeline, which can adjust the length of the liquid phase main pipeline; the internal port of the liquid phase main pipeline and the internal port of the liquid phase rear pipeline (i.e., the port at one end in the outer cylinder) are located opposite to each other, and the internal ports can be connected and separated by telescoping the liquid phase main pipeline; The rear section of the liquid phase main pipeline at the soft telescopic tube is used as a movable pipeline and is fixedly connected to the inner side of the rear separation cylinder of the outer cylinder through a bracket, so that the liquid phase main pipeline can be driven to expand and contract by moving the rear separation cylinder to control the docking and separation of the liquid phase main pipeline and the liquid phase rear pipeline; when the soft telescopic tube is in the unfolded state (i.e., the distance between the front and rear separation cylinders is the largest), the liquid phase main pipeline and the liquid phase rear pipeline are in a sealed docking state; One end of the foam branch is arranged at the front end of the front separation cylinder of the outer cylinder and communicates with the inner cavity of the outer cylinder; the other end of the foam branch is connected to and penetrates the liquid phase main line; The liquid phase main line is provided with a switch valve; the switch valve is located behind the connection point between the foam branch line and the liquid phase main line (that is, between the connection point between the foam branch line and the liquid phase main line and the outer cylinder); The inner cylinder is also provided with an air inlet at the rear end thereof, and the air inlet is connected to an external gas supply device; The fixed bracket is used to support the entire switching device, and is divided into front and rear supporting legs. The front supporting leg is fixedly connected to the front separation cylinder of the outer cylinder, and the rear supporting leg is fixedly connected to the rear end of the inner cylinder; the fixed bracket is fixed to the ground or platform.

[0006] In the present invention, a metal mesh screen for foaming is provided in the outer cylinder and / or the inner cylinder between the air inlet and the foam branch, and a through hole is provided in the center of the metal mesh screen for the liquid phase main line to pass through.

[0007] In the present invention, the metal mesh screen is replaceable, and a plurality of metal mesh screens can be provided. Metal mesh screens with different mesh specifications can be provided according to the foaming requirements.

[0008] In the present invention, the internal port of the liquid phase main pipeline is in a bell-mouth shape, and a sealing silicone is provided on the inner wall of the bell-mouth. After the internal port of the liquid phase rear pipeline is inserted into the internal port of the liquid phase main pipeline, it can fit tightly on the sealing silicone, which can further improve the sealing effect of the liquid phase; because of the bell-mouth-shaped pipe opening expansion design, it is convenient for the liquid phase rear pipeline to automatically correct the alignment when docking, and it can be docked to the liquid phase main pipeline more accurately.

[0009] In the present invention, the switch valve is an electrically controlled valve, and is further provided with a linkage control switch, which is connected to the switch valve via a main control panel arranged outside the outer tube, and the switch valve can be controlled to open and close automatically via the linkage control switch.

[0010] In the present invention, the linkage control switch is a light sensor, which is embedded on the outer surface of the inner tube and located near the edge of the rear separation cylinder of the outer tube, and is connected to the main control board outside the outer tube through a line; When the rear separation cylinder is pulled backward, the liquid phase main pipeline and the liquid phase rear pipeline are separated, and the rear separation cylinder blocks the light sensor, which excites and sends a signal to the main control board, and the main control board controls the electric control valve to close. When the rear separation cylinder is pushed forward, the rear separation cylinder leaves the light sensor, and the main control board controls the electric control valve to open. This linkage control makes it easier for firefighters to speed up operations and form a one-step quick switch.

[0011] In the present invention, a handle for facilitating pulling of the rear separation cylinder is provided on the rear separation cylinder.

[0012] In the present invention, there are a plurality of air inlets which are arranged around the surface of the outer cylinder at equal intervals.

[0013] In the present invention, the soft telescopic tube adopts a conventional plastic metal telescopic tube on the market.

[0014] When the present invention is used, the device is placed near the fire source, the liquid phase rear pipeline is connected to the external fire water source through a hose, and the liquid phase main pipeline is connected to a conventional fire sprinkler through a hose; the rear separation cylinder is pulled to the end, the liquid phase main pipeline and the liquid phase rear pipeline are sealed and connected, the fire sprinkler valve is opened, and the fire water source is directly sprayed from the liquid phase rear pipeline through the liquid phase main pipeline and out of the fire sprinkler to perform water-based fire extinguishing; When the fire source cannot be extinguished by water but requires foam extinguishing, the fire extinguishing agent needs to be switched. At this time, the rear end needs to supply a foam mixture, which enters the outer cylinder through the liquid phase rear pipeline and mixes with the compressed air entering from the air inlet in the outer cylinder, thereby foaming through the metal mesh screen. Under the continuous push of compressed air and the mixed liquid, the foam mixture flows through the foam branch pipe to the liquid phase main pipeline to carry out foam fire extinguishing.

[0015] In addition, there is a pre-set foam fire extinguishing agent in the outer cylinder of the device. In an emergency situation, such as when using water-based fire extinguishing, firefighters suddenly find that there are special flammable materials on the scene that cannot be extinguished by water-based fire extinguishing. They can close the switch valve on the liquid phase main line, push the rear separation cylinder forward, separate the liquid phase main line and the liquid phase rear line, and water directly enters the outer cylinder and the inner cylinder to mix with the prefabricated foam fire extinguishing agent in the outer cylinder; open the external gas supply device, inject compressed gas into the inner cylinder, the gas blows the foam mixed liquid in the outer cylinder and the inner cylinder to surge, and passes through the internal metal mesh screen for full foaming, and then, under the blowing of gas, the foamed foam fire extinguishing liquid flows to the front end of the liquid phase main line through the foam branch; open the fire sprinkler valve, and the foam fire extinguishing liquid is sprayed out from the fire sprinkler for temporary emergency foam fire extinguishing, which buys time for subsequent replacement of the foam mixed liquid with a good ratio.

[0016] In addition, the device can also be used to conduct fire extinguishing efficiency experiments of multiple types of fire extinguishing agents within the laboratory to improve the efficiency when switching fire extinguishing agents. The metal mesh screen inside the device can improve the foaming effect, avoiding the installation of traditional foaming devices, and effectively improving the integration of the system.

[0017] The present invention facilitates firefighters to flexibly switch fire extinguishing agents according to the type of fire source and surrounding combustibles at the fire scene to carry out fire extinguishing and rescue work. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the cut-away internal structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the interface between the liquid phase main pipeline and the liquid phase rear pipeline.

[0021] Figure 4 Schematic diagram of the sealing rubber ring at the opening position of the inner and outer cylinders.

[0022] Numbers in the figure: 1 is the outer cylinder, 2 is the inner cylinder, 3 is the liquid phase main pipeline, 4 is the front separation cylinder, 5 is the rear separation cylinder, 6 is the plastic metal telescopic tube, 7 is the liquid phase rear pipeline, 8 is the foam branch, 9 is the fixed bracket, 10 is the mobile pipeline, 11 is the inner supporting connecting rod, 12 is the switch valve, 13 is the air inlet, 14 is the metal mesh screen, and 15 is the handle. DETAILED DESCRIPTION

[0023] The fire extinguishing agent switching device of the present invention comprises an outer cylinder 1, an inner cylinder 2, a liquid phase main line 3, a liquid phase rear line 7, a foam branch line 8 and a fixed bracket; the outer cylinder 1, the inner cylinder 2, the liquid phase main line 3, the liquid phase rear line 7, the foam branch line 8 and the fixed bracket 9 can all be made of stainless steel metal material (or high-strength plastic material); The outer cylinder 1 is cylindrical, with a closed front end and an open rear end, and is divided into a front separation cylinder 4 and a rear separation cylinder 5. The front and rear separation cylinders are connected by a conventional plastic metal telescopic tube 6 on the market, and the distance between the front and rear separation cylinders can be adjusted as the plastic metal telescopic tube 6 is extended and contracted; a certain amount of foam fire extinguishing agent is stored in the outer cylinder 1; The inner cylinder 2 is cylindrical, and the inner cylinder 2 is inserted from the rear end opening of the outer cylinder 1 to closely fit the inner wall of the rear separation cylinder body 5 of the outer cylinder 1. There is a large contact surface between the inner and outer cylinders. In order to ensure that the contact surfaces of the two still have a good sealing effect during movement, sealing rubber rings are provided at the opening positions of the inner and outer cylinders. The cross-section of the sealing rubber ring can be designed to be a right-angled triangle, and the contact sliding surfaces of the inner and outer side walls of the outer cylinder 1 and the inner cylinder 2 are provided with waterproof grease to ensure that the rear separation cylinder body 5 can slide smoothly back and forth on the outer side wall surface of the inner cylinder under waterproof conditions; the rear end of the inner cylinder 2 exposes the outer cylinder 1; the inner cavity of the inner cylinder 2 and the inner cavity of the outer cylinder 1 are connected; the specific method is shown in Figure 4 As shown; The liquid phase main pipeline 3 is inserted into the outer cylinder 1 from the front end face of the front separation cylinder 4 and is fixedly connected by welding and sealing; the liquid phase rear pipeline 7 is inserted from the rear end face of the inner cylinder 2 and is also fixedly connected by welding and sealing; the external port of the liquid phase main pipeline 3 is connected to a conventional fire sprinkler, and the external port of the liquid phase rear pipeline 7 is connected to an external water pump; The middle section of the liquid phase main pipeline 3 is also provided with a small-sized plastic metal telescopic tube 6, which can adjust the length of the liquid phase main pipeline 3; the internal port of the liquid phase main pipeline 3 and the internal port of the liquid phase rear pipeline 7 (i.e., the port at one end in the outer cylinder) are opposite to each other, and the two internal ports are connected and separated by telescoping the liquid phase main pipeline 3; wherein: The internal port of the liquid phase main pipeline 3 is in a bell-mouth shape, and a sealing silicone is provided on the inner wall of the bell-mouth. After the internal port of the liquid phase rear pipeline 7 is inserted into the internal port of the liquid phase main pipeline 3, it can fit tightly on the sealing silicone. Because of the bell-mouth-shaped pipe opening expansion design, it is convenient for the liquid phase rear pipeline to automatically correct the alignment when docking, and dock with the liquid phase main pipeline more accurately. Figure 3 shown.

[0024] In addition, the internal port of the liquid phase rear pipeline 7 can also be designed to be a contraction mouth shape that matches the bell-mouth shape, which can increase the port contact area and improve the sealing and waterproof effect.

[0025] The liquid phase main pipeline 3 is at the rear section of the plastic metal telescopic tube 6, as a movable pipeline 10, and is fixedly connected to the inner side of the rear separation cylinder 5 of the outer cylinder 1 through several inner supporting connecting rods 11, so that the movable pipeline 10 can be driven to move by moving the rear separation cylinder 5, that is, the expansion and contraction of the liquid phase main pipeline 3, so as to control the docking and separation of the liquid phase main pipeline 3 and the liquid phase rear pipeline 7; when the plastic metal telescopic tube 6 is in the unfolded state (that is, the distance between the front and rear separation cylinders is the largest), the liquid phase main pipeline 3 is in the longest state, and can be in a sealed docking state with the liquid phase rear pipeline 7; One end of the foam branch 8 is arranged at the front end of the front separation cylinder 4 of the outer cylinder 1 and communicates with the inner cavity of the outer cylinder 1; the other end of the foam branch 8 is connected to and penetrates the front end of the liquid phase main line 3; The liquid phase main line 3 is provided with a switch valve 12; the switch valve 12 is located behind the connection point between the foam branch line 8 and the liquid phase main line 3, that is, between the connection point between the foam branch line 8 and the liquid phase main line 3 and the outer cylinder; when the switch valve 12 is closed, the liquid can flow from the rear end of the liquid phase main line 3 through the foam branch line 8 to the external port of the liquid phase main line 3; The inner cylinder 2 is also provided with an air inlet 13 at the rear end thereof, and the air inlet 13 is connected to the air pump of the external gas supply device through a hose to provide high-pressure compressed gas injection; there are four air inlets, which are arranged around the cylindrical surface of the outer cylinder at equal intervals and are located after the docking point of the liquid phase main pipeline 3 and the liquid phase rear pipeline 7; in this way, the gas can enter the outer cylinder 1 from all angles, which helps to improve the uniformity of foaming, and the number of required air inlets can be flexibly selected according to the foam multiple required on site. If high-multiple foam is required, the air inlet can be fully opened for air supply, and vice versa; when necessary, the air inlet can also be used as a liquid inlet for injecting foam stock to ensure temporary emergency foam supply; In the inner cylinder 2, a circular metal mesh screen 14 for foaming is provided in front of the connection point between the liquid phase main pipeline 3 and the liquid phase rear pipeline 7, and a through hole is provided in the center of the metal mesh screen 14 for the liquid phase main pipeline 3 to pass through; the metal mesh screen 14 is replaceable, and 2 to 3 metal mesh screens 14 can be provided. According to the needs of foaming, metal mesh screens 14 with different mesh specifications can be provided and replaced.

[0026] The rear separation cylinder 5 is provided with a handle 15 for pulling the rear separation cylinder.

[0027] The fixed bracket 9 is used to support the entire switching device, and is divided into front and rear support legs. The front support leg is fixedly connected to the front separation cylinder 4 of the outer cylinder 1, and the rear support leg is fixedly connected to the rear end of the inner cylinder 2. The fixed bracket 9 is fixed to the ground or platform. During operation, since the outer cylinder is designed to be separated, the outer cylinder 5 needs to be supported by the inner cylinder 2, so the entire fixed bracket 9 is required to be fixed and cannot be adjusted; here: The front separation cylinder 4 is fixedly connected to the liquid phase main pipeline 3, and the external port of the liquid phase main pipeline 3 is connected to the hose of the fire sprinkler, which needs to be fixed firmly and immovably; The inner cylinder 2 and the liquid phase rear pipeline 7 are also fixedly connected, the external port of the liquid phase rear pipeline 7 is connected to the hose of the external water pump, and the air inlet of the inner cylinder 2 is connected to the hose of the external gas supply device, which also needs to be fixed firmly and immovable to ensure the operation stability; Therefore, the fixed bracket 9 is preferably configured to be fixedly connected to the front separation cylinder 4 of the outer cylinder 1 and the inner cylinder 2, and the rear separation cylinder 5 in the middle section is designed as a movable telescopic adjustment component.

[0028] The switch valve 12 is an electrically controlled valve, and is further provided with a light sensor and a main control board. The light sensor is embedded on the outer surface of the inner tube 2 and is located near the edge of the rear separation cylinder 5 of the outer tube 1. It is connected to the main control board through a line, and the main control board is also connected to the electrically controlled valve; the main control board can be fixedly set in a control box preset on the outside of the outer tube; when the rear separation cylinder 5 is pulled backward, the liquid phase main pipeline 3 and the liquid phase rear pipeline 7 are separated, and the rear separation cylinder 5 blocks the light sensor, and the light sensor is stimulated to send a signal to the main control board, and the main control board controls the electrically controlled valve to close. When the rear separation cylinder is pushed forward, the rear separation cylinder leaves the light sensor, and the main control board controls the electrically controlled valve to open; such linkage control facilitates firefighters to speed up operations and form a one-step quick switch.

[0029] When the present invention is used, the device is placed near the fire source, the liquid phase rear pipeline is connected to the external fire water source through a hose, and the liquid phase main pipeline is connected to a conventional fire sprinkler through a hose; the rear separation cylinder is pulled to the end, the liquid phase main pipeline and the liquid phase rear pipeline are sealed and connected, the fire sprinkler valve is opened, and the fire water source is directly sprayed from the liquid phase rear pipeline through the liquid phase main pipeline and out of the fire sprinkler to perform water-based fire extinguishing; When the fire source cannot be extinguished by water and needs to be extinguished by foam, the fire extinguishing agent needs to be switched. At this time, the rear end needs to supply a foam mixture, which enters the outer cylinder through the liquid phase rear pipeline and mixes with the compressed air entering the air inlet in the outer cylinder, thereby foaming through the metal mesh screen. Under the continuous push of the compressed air and the mixture, the foam mixture flows through the foam branch pipe to the liquid phase main pipeline to perform foam fire extinguishing; Among them, the foam mixture is produced in the following way: during the transportation of water by the fire pump, negative pressure is generated through the foam proportioning mixer to suck in the foam fire extinguishing agent and mix to form a foam mixture. After the liquid phase main pipeline and the liquid phase rear pipeline are disconnected, the foam mixture enters the device through the liquid phase rear pipeline, the switch valve of the liquid phase main pipeline is closed, and compressed air is injected into the outer cylinder through the air inlet of the inner cylinder at the same time, thereby generating compressed air foam, which is fully foamed through the internal metal mesh screen. Under the continuous push of compressed air and mixed liquid, the foam flows to the liquid phase main pipeline through the foam branch pipe to carry out foam fire extinguishing.

[0030] In addition, there is a pre-set foam fire extinguishing agent in the outer cylinder of the device. In an emergency situation, for example, when using water-based fire extinguishing, firefighters suddenly find that there are special flammable materials on the scene (such as new energy vehicles, car accident scenes, certain fuel oils, chemical materials, power batteries, etc. on the scene) that cannot be simply extinguished with water-based fire. The switch valve on the liquid phase main line can be closed, and the rear separation cylinder can be pushed forward. The liquid phase main line and the liquid phase rear line are separated, and water directly enters the outer cylinder and the inner cylinder to mix with the foam fire extinguishing agent pre-stored in the outer cylinder; the external gas supply device is opened, and compressed gas is injected into the inner cylinder. The gas blows the foam mixed liquid in the outer cylinder and the inner cylinder to surge, and it is fully foamed through the internal metal mesh screen. Then, under the blowing of the gas and the push of the liquid phase, the foam flows to the front end of the liquid phase main line through the foam branch; the fire sprinkler valve is opened, and the foam fire extinguishing liquid is sprayed out from the fire sprinkler to carry out temporary emergency foam fire extinguishing; time is gained for subsequent replacement of the foam mixed liquid with a good ratio. It is worth mentioning that the air inlet can also be used as a liquid inlet for temporary filling of foam fire extinguishing agent concentrate. When the foam concentrate is continuously supplied, the emergency foam supply can also be guaranteed to be uninterrupted.

[0031] In addition, the present invention can also be miniaturized and used to carry out fire extinguishing efficiency experiments of water / foam and other liquid phase fire extinguishing agents to improve the efficiency and accuracy of experimental research.

[0032] Although the above methods are illustrated and described as a series of structures for simplicity of explanation, it should be understood and appreciated that these methods are not specifically limited because according to one or more embodiments, some structures may occur in different orders and / or concurrently with other actions from those illustrated and described herein or not illustrated and described herein but understandable to those skilled in the art.

[0033] The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A switching device for a fire extinguishing agent, characterized in that: It includes an outer cylinder, an inner cylinder, a liquid phase main pipeline, a foam branch pipeline, a liquid phase rear pipeline and a fixed bracket; The outer cylinder has a closed front end and an open rear end, and is divided into a front and rear separation cylinder, which are connected by a soft telescopic tube, and the distance between the front and rear separation cylinders can be adjusted as the soft telescopic tube is extended and contracted; the outer cylinder stores a foam fire extinguishing agent; The inner cylinder is inserted into the rear end opening of the outer cylinder in a sealed manner, and the rear end of the inner cylinder is exposed from the outer cylinder; the inner cavity of the inner cylinder and the inner cavity of the outer cylinder are connected; the rear separation cylinder can slide back and forth on the outer wall surface of the inner cylinder; The liquid phase main pipeline is inserted into the outer cylinder from the front end of the front separation cylinder and is fixedly connected to the front separation cylinder; the liquid phase rear pipeline is inserted from the rear end of the inner cylinder and is fixedly connected to the inner cylinder; the external port of the liquid phase main pipeline is connected to the fire sprinkler, and the external port of the liquid phase rear pipeline is connected to the external water pump; A soft telescopic tube is provided in the middle section of the liquid phase main pipeline, which can adjust the length of the liquid phase main pipeline; the internal port of the liquid phase main pipeline and the internal port of the liquid phase rear pipeline are located opposite to each other, and the internal ports can be connected and separated by telescoping the liquid phase main pipeline; The rear section of the liquid phase main pipeline at the soft telescopic tube is used as a movable pipeline and is fixedly connected to the inner side of the rear separation cylinder of the outer cylinder through a bracket, so that the liquid phase main pipeline can be driven to expand and contract by moving the rear separation cylinder to control the docking and separation of the liquid phase main pipeline and the liquid phase rear pipeline; when the soft telescopic tube is in an unfolded state, the liquid phase main pipeline and the liquid phase rear pipeline are in a sealed docking state; One end of the foam branch is arranged at the front end of the front separation cylinder of the outer cylinder and communicates with the inner cavity of the outer cylinder; the other end of the foam branch is connected to and penetrates the liquid phase main line; The liquid phase main line is provided with a switch valve; the switch valve is located after the connection point between the foam branch line and the liquid phase main line; The inner cylinder is also provided with an air inlet at the rear end thereof, and the air inlet is connected to an external gas supply device; The fixed bracket is used to support the entire switching device, and is divided into front and rear supporting legs. The front supporting leg is fixedly connected to the front separation cylinder of the outer cylinder, and the rear supporting leg is fixedly connected to the rear end of the inner cylinder; the fixed bracket is fixed to the ground or platform.

2. The fire extinguishing agent switching device according to claim 1, characterized in that: A metal mesh screen for foaming is provided in the outer cylinder and / or the inner cylinder, between the air inlet and the foam branch, and a through hole is provided in the center of the metal mesh screen for the liquid phase main line to pass through.

3. The fire extinguishing agent switching device according to claim 2, characterized in that: The metal mesh screen is replaceable, and a plurality of metal mesh screens can be provided. Metal mesh screens with different mesh specifications can be provided according to the foaming requirements.

4. The fire extinguishing agent switching device according to claim 1, characterized in that: The internal port of the liquid phase main pipeline is in a bell-mouth shape, and a sealing silicone is provided on the inner wall of the bell-mouth. After the internal port of the liquid phase rear pipeline is inserted into the internal port of the liquid phase main pipeline, it can fit tightly on the sealing silicone.

5. The fire extinguishing agent switching device according to claim 1, characterized in that: The switch valve is an electrically controlled valve, and is further provided with a linkage control switch, which is connected to the switch valve via a main control panel arranged outside the outer tube, and the switch valve can be controlled to open and close automatically via the linkage control switch.

6. The fire extinguishing agent switching device according to claim 5, characterized in that: The linkage control switch is a light sensor, which is embedded on the outer surface of the inner tube and located near the edge of the rear separation cylinder of the outer tube, and is connected to the main control board outside the outer tube through a line; When the rear separation cylinder is pulled backward, the liquid phase main pipeline and the liquid phase rear pipeline are separated, and the rear separation cylinder blocks the light sensor. The light sensor is stimulated to send a signal to the main control board, and the main control board controls the electric control valve to close. When the rear separation cylinder is pushed forward, the rear separation cylinder leaves the light sensor, and the main control board controls the electric control valve to open.

7. The fire extinguishing agent switching device according to claim 1, characterized in that: The rear separation cylinder is provided with a handle for facilitating pulling of the rear separation cylinder.

8. The fire extinguishing agent switching device according to claim 1, characterized in that: There are a plurality of air inlets which are arranged around the surface of the outer cylinder at equal intervals.

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