Liquid nitrogen fireproof system of charging station

Abstract

The utility model relates to the technical field of charging stations, in particular to a liquid nitrogen fire prevention system of a charging station. A charging pile is arranged in the charging box, a charging wire is installed on the side wall of the charging pile, the end of the charging wire is connected with an automobile, a liquid nitrogen system is installed around the exterior of the charging box, and an exhaust system is installed at the top end of the charging box. The side wall of the charging box is provided with an electric door, and the top in the charging box is provided with a smoke sensor. The smoke sensor is used for detecting the abnormal smoke concentration and immediately transmitting a signal to the central control system, after the signal is received, the electrically operated gate is immediately closed, the air outlet is subjected to vacuum adsorption through the vacuum pump, and after five seconds, the liquid nitrogen system is started to work to cool and extinguish the automobile from all directions. As the liquid nitrogen has extremely low temperature, the liquid nitrogen can quickly absorb a large amount of heat, so that the temperature around a fire source is quickly reduced, and flames are effectively extinguished.

Description

Technical Field

[0001] The utility model relates to the technical field of charging stations, and specifically to a liquid nitrogen fire prevention system for charging stations. Background Technique

[0002] Electric vehicles are currently the most popular, energy-saving and environment-friendly green travel vehicles. The chargers supporting electric vehicles often require 7-8 hours for a single charge. Once there is no power during driving, the riders will be in an embarrassing situation. According to investigations, at least 5 out of 10 electric vehicle users have encountered electric vehicle breakdowns. Electric vehicle quick charging stations can be set up beside street shops, street communities, newspaper kiosks, bicycle storage sheds, lottery ticket betting points, etc., just like gas stations for cars. With the popularization of charging stations, electric vehicle users no longer have to worry about running out of power halfway and no longer dare not travel far due to insufficient battery power;

[0003] However, the interior of charging stations is often enclosed. Lithium batteries may cause thermal runaway due to abnormal conditions such as internal short circuits and overcharging during charging or use. In this case, the battery will quickly heat up and generate a large amount of heat and combustible gases, which are extremely likely to cause a fire. Smoke and harmful gases cannot be discharged in time, posing a greater threat to personnel and equipment. Traditional fire extinguishing methods such as dry powder or water often have limited effects when dealing with lithium battery fires and may even exacerbate the fire. In view of this, we propose a liquid nitrogen fire prevention system for charging stations. Content of the Utility Model

[0004] The purpose of the utility model is to provide a liquid nitrogen fire prevention system for charging stations to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides a liquid nitrogen fire prevention system for charging stations, including a charging box. A charging pile is arranged inside the charging box. A charging wire is installed on the side wall of the charging pile. The end of the charging wire is connected to a vehicle. The charging wire is used to charge the vehicle. A liquid nitrogen system is installed around the outside of the charging box. An exhaust system is installed on the top of the charging box;

[0006] An electric door is installed on the side wall of the charging box. The electric door is used to close the charging box. A smoke sensor is arranged at the top inside the charging box. The smoke sensor is used to detect the safety situation inside the charging box.

[0007] As a further improvement of this technical solution, the liquid nitrogen system includes a nitrogen storage tank for storing liquid nitrogen. A vacuum adiabatic infusion pipe is installed on the outer wall of the nitrogen storage tank for transporting liquid nitrogen. A gas-liquid separator is installed at the output end of the vacuum adiabatic infusion pipe. Among them, the gas-liquid separator is used to separate the gas and liquid in the liquid nitrogen.

[0008] As a further improvement of the present technical solution, the vacuum insulated infusion tube is respectively arranged on the side wall and the top of the nitrogen storage box, and the end of the vacuum insulated infusion tube passes through the charging box to the inside.

[0009] As a further improvement of the present technical solution, the exhaust system includes a vacuum pump and an air storage tank. The vacuum pump is used for vacuum adsorption. A delivery pipe is connected between the top of the vacuum pump and the side wall of the air storage tank.

[0010] As a further improvement of the technical solution, an exhaust port is opened at the top of the charging box, and the exhaust port is connected to the bottom end of the vacuum pump, and the exhaust port is used to exhaust smoke.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] When an accident occurs at a charging station in an independent space, the smoke sensor will immediately detect abnormal smoke concentration and transmit the signal to the central control system. After receiving the signal, the electric door will be closed immediately, and the exhaust port will be vacuumed by a vacuum pump. Then 5 seconds later, the liquid nitrogen system will start working to cool the car from all directions to extinguish the fire. Since liquid nitrogen has an extremely low temperature, it can quickly absorb a large amount of heat, so that the temperature around the fire source will drop rapidly, thereby effectively extinguishing the flame. At the same time, liquid nitrogen can also evaporate and spread rapidly, and achieve the effect of suffocation and fire extinguishing by physically isolating the oxygen in the air, which can effectively prevent the spread of fire and avoid greater losses and damage. Liquid nitrogen is a colorless, odorless, non-toxic fire extinguishing medium. It will not cause secondary pollution to the environment during the fire extinguishing process. It will evaporate quickly after the fire is extinguished, and there is no need to clean up residual fire extinguishing agents, reducing the difficulty and cost of subsequent processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a schematic cutaway diagram of the overall structure of the utility model;

[0015] Figure 3 It is a schematic cross-sectional view of the overall structure of the utility model.

[0016] The meaning of each number in the figure is:

[0017] 100, charging box; 101, electric door; 102, charging pile; 1020, charging cable; 103, car; 104, smoke sensor; 105, exhaust vent;

[0018] 200, liquid nitrogen system; 201, nitrogen storage tank; 2010, vacuum insulated infusion tube;

[0019] 300. Exhaust system; 301. Vacuum pump; 302. Gas storage tank; 3010. Delivery pipe. Detailed implementation mode

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] Electric vehicles are currently the most popular, energy-saving and environmentally friendly green travel vehicles. The chargers supporting electric vehicles often require 7-8 hours for a single charge. Once there is no power during driving, the rider will be in an embarrassing situation. According to investigations, at least 5 out of 10 electric vehicle users have encountered electric vehicle breakdowns. Electric vehicle quick charging stations can be set up beside street shops, street communities, newspaper kiosks, bicycle storage sheds, lottery ticket sales points, etc., just like gas stations for cars 103. With the popularization of charging stations, electric vehicle users will no longer be troubled by running out of power halfway and will no longer dare not travel far due to insufficient battery power.

[0022] Please refer to Figures 1-3 As shown, this embodiment provides a liquid nitrogen fire prevention system for a charging station, including a charging box 100. Inside the charging box 100, there is a charging pile 102. A charging wire 1020 is installed on the side wall of the charging pile 102. The end of the charging wire 1020 is connected to a vehicle 103. The charging wire 1020 is used to charge the vehicle 103. Considering that the interior of a charging station is often enclosed, lithium batteries may cause thermal runaway due to abnormal conditions such as internal short circuits and overcharging during charging or use. In this case, the battery will quickly heat up and generate a large amount of heat and combustible gases, which are extremely likely to cause a fire. Smoke and harmful gases cannot be discharged in time, posing a greater threat to personnel and equipment. Traditional fire extinguishing methods such as dry powder or water often have limited effects in dealing with lithium battery fires and may even exacerbate the fire. Therefore, specifically as follows: A liquid nitrogen system 200 is installed around the outside of the charging box 100, and an exhaust system 300 is installed at the top of the charging box 100; An electric door 101 is installed on the side wall of the charging box 100. The electric door 101 is used to enclose the charging box 100. A smoke sensor 104 is arranged at the top inside the charging box 100. The smoke sensor 104 is used to detect the safety situation inside the charging box 100.

[0023] The improvement of this embodiment lies in:

[0024] By using the smoke sensor 104 to detect abnormal smoke concentration and immediately transmit the signal to the central control system, after receiving the signal, the electric door 101 will be immediately closed, and the exhaust port 105 will be vacuum adsorbed by the vacuum pump 301. Then, 5 seconds later, the liquid nitrogen system 200 will start working to cool down the car 103 from all directions to extinguish the fire. Since liquid nitrogen has an extremely low temperature, it can quickly absorb a large amount of heat, so that the temperature around the fire source is rapidly reduced, thereby effectively extinguishing the flames.

[0025] Specifically, the liquid nitrogen system 200 includes a nitrogen storage tank 201, which is used to store liquid nitrogen. A vacuum insulated infusion pipe 2010 is installed on the outer wall of the nitrogen storage tank 201, and the vacuum insulated infusion pipe 2010 is used to transport liquid nitrogen. A gas-liquid separator is installed at the output end of the vacuum insulated infusion pipe 2010, wherein: the gas-liquid separator is used to separate the gas and liquid in the liquid nitrogen, and the vacuum insulated infusion pipe 2010 is respectively arranged on the side wall and the top of the nitrogen storage tank 201, and the end of the vacuum insulated infusion pipe 2010 passes through the charging box 100 to the inside;

[0026] When liquid nitrogen reaches the gas-liquid separator through the vacuum insulated infusion pipe 2010, the gaseous nitrogen and liquid nitrogen are separated by physical principles such as gravity, and the gaseous nitrogen is discharged into the atmosphere through the vacuum pipeline, while the pure liquid nitrogen continues to go to the next link through the vacuum insulated infusion pipe 2010. The pure liquid nitrogen reaches the positions of the charging pile 102 and the car 103 through the vacuum insulated infusion pipe 2010, and is evenly sprayed on the fire source through a specific nozzle. After completing the fire extinguishing task, the liquid nitrogen system 200 will stop spraying and automatically reset to prepare for the next emergency.

[0027] In order to discharge the smoke inside the enclosed space, the exhaust system 300 includes a vacuum pump 301 and a gas tank 302. The vacuum pump 301 is used for vacuum adsorption. A delivery pipe 3010 is connected between the top of the vacuum pump 301 and the side wall of the gas tank 302. An exhaust port 105 is opened at the top of the charging box 100. The exhaust port 105 is connected to the bottom of the vacuum pump 301 and is used to discharge smoke.

[0028] Utilizing the principle of hot air rising, the smoke rises to the exhaust port 105, and the vacuum pump 301 is started to maintain a stable negative pressure environment, adsorbing the smoke and harmful gases and transporting them to the inside of the gas storage tank 302 through the delivery pipe 3010. When the adsorption state needs to be released, the vacuum pump 301 is stopped and the vacuuming is no longer continued.

[0029] When the liquid nitrogen fire prevention system of the utility model charging station is in specific use, the smoke sensor 104 is a device that can sense the smoke concentration in the air and issue an alarm. It can quickly detect the presence of smoke in the initial stage of a fire. When a fire or an accident occurs, the smoke sensor 104 will immediately detect the abnormal smoke concentration and transmit the signal to the central control system. Subsequently, the control system will trigger the closing instruction of the electric door 101 to ensure that the fire source or harmful gas will not spread to other areas. At the same time, it can also prevent new oxygen from entering and reduce the possibility of the fire spreading. After receiving the smoke signal, the controller will control the exhaust system 300 to start. The use of the vacuum pump 301 helps to more quickly reduce the oxygen concentration in the space, which helps to extinguish the fire because the flame needs oxygen to maintain combustion. Thus, the oxygen in the space can be quickly discharged through the exhaust port 105. Five seconds after the electric door 101 is closed and the exhaust port 105 starts working, the liquid nitrogen system 200 starts to work. The temperature of the liquid nitrogen is very low, which can quickly reduce the temperature of the vehicle 103 and the charging pile 102, thus extinguishing the fire. At the same time, the low temperature also helps to prevent other batteries from catching fire due to high temperature.

[0030] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art of this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection claimed by the utility model is defined by the appended claims and their equivalents.

Claims

1. A liquid nitrogen fire prevention system for a charging station, comprising a charging box (100), wherein a charging pile (102) is arranged inside the charging box (100), a charging line (1020) is installed on a side wall of the charging pile (102), an end of the charging line (1020) is connected to a car (103), and the charging line (1020) is used to charge the car (103), characterized in that: A liquid nitrogen system (200) is installed around the outside of the charging box (100), and an exhaust system (300) is installed on the top of the charging box (100); An electric door (101) is installed on the side wall of the charging box (100), and the electric door (101) is used to close the charging box (100). A smoke sensor (104) is arranged at the top of the interior of the charging box (100), and the smoke sensor (104) is used to detect the safety situation inside the charging box (100).

2. The liquid nitrogen fire protection system for a charging station according to claim 1, characterized in that: The liquid nitrogen system (200) comprises a nitrogen storage box (201), the nitrogen storage box (201) being used to store liquid nitrogen; a vacuum insulated liquid infusion pipe (2010) being installed on the outer wall of the nitrogen storage box (201), the vacuum insulated liquid infusion pipe (2010) being used to transport liquid nitrogen; a gas-liquid separator being installed at the output end of the vacuum insulated liquid infusion pipe (2010), wherein the gas-liquid separator is used to separate gas and liquid in the liquid nitrogen.

3. The liquid nitrogen fire protection system for a charging station according to claim 2, characterized in that: The vacuum insulated liquid infusion pipe (2010) is respectively arranged on the side wall and the top of the nitrogen storage box (201), and the end of the vacuum insulated liquid infusion pipe (2010) passes through the charging box (100) to the inside.

4. The liquid nitrogen fire protection system for a charging station according to claim 1, characterized in that: The exhaust system (300) comprises a vacuum pump (301) and an air storage tank (302); the vacuum pump (301) is used for vacuum adsorption; a delivery pipe (3010) is connected between the top of the vacuum pump (301) and the side wall of the air storage tank (302).

5. The liquid nitrogen fire protection system for a charging station according to claim 1, characterized in that: An exhaust port (105) is provided at the top of the charging box (100), and the exhaust port (105) is connected to the bottom of the vacuum pump (301). The exhaust port (105) is used to exhaust smoke.

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