Electric vehicle charging pile with fire extinguishing and flame-retardant structure

Abstract

The application belongs to the technical field of charging piles, and particularly relates to an electric vehicle charging pile with a fire extinguishing and flame retarding structure, which comprises a cabinet body, heat dissipation through-slots are arranged in an array on the left and right side walls of the cabinet body, fire extinguishing spray plates for storing phase-change fire extinguishing agents are symmetrically arranged in the cabinet body, the two fire extinguishing spray plates form a sealed chamber for mounting electrical appliances, heat dissipation plates are arranged on the outer sides of the two fire extinguishing spray plates, the heat dissipation plates can drive the fire extinguishing spray plates to release fire extinguishing agents by gravity under pressure in a fire, traction ropes are arranged in the cabinet body to keep the two heat dissipation plates in a suspended state, a cutting assembly for cutting the traction ropes is arranged in the cabinet body, and a fire condition monitoring assembly for controlling the cutting assembly is arranged in the sealed chamber; the above-mentioned structure cooperation enables the charging pile to release phase-change fire extinguishing agents in time in a fire to extinguish the fire and retard the flame.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of charging piles, in particular to an electric vehicle charging pile with a fire extinguishing and flame-retardant structure. BACKGROUND

[0002] A charging pile, also known as an electric vehicle charging station or an electric vehicle power supply device, is a device that provides electric energy for electric vehicles, enabling electric vehicles to store enough electric energy to support their operation. During the operation of the charging pile, the internal charging modules and IGBT (Insulated Gate Bipolar Transistor) power devices generate a large amount of heat. If the heat is not dissipated in time, it can cause the components to overheat and age, and even cause safety accidents such as short circuits and spontaneous combustion.

[0003] However, the existing charging piles have the following technical solutions for heat dissipation and fire prevention, but all have obvious limitations: 1. Deficiency of the heat dissipation scheme The existing charging piles generally rely on a combination of air cooling and filter screen dust prevention: by opening a heat dissipation channel in the cabinet, air flow is driven by a fan to carry away heat, and a filter screen is used to block external dust. However, this scheme is prone to be clogged by dust over time, resulting in a decrease in the flow rate of the heat dissipation channel and a decrease in the heat dissipation efficiency. The filter screen needs to be frequently disassembled and cleaned. At the same time, the negative pressure generated by the fan operation can cause small dust particles to penetrate the filter screen and accumulate on the surface of the circuit board and the heat sink, forming a heat conduction barrier and increasing the probability of circuit short circuit and contact oxidation.

[0004] Therefore, the application provides an electric vehicle charging pile with a fire extinguishing and flame-retardant structure. SUMMARY

[0005] To compensate for the deficiencies of the prior art and solve the technical problem of the existing charging pile in the background art, which is difficult to reconcile between heat dissipation efficiency, dust prevention reliability, and fire extinguishing timeliness.

[0006] The technical scheme adopted by the present application to solve its technical problems is: the electric vehicle charging pile with fire extinguishing and flame-retardant structure, comprising a cabinet body, the left and right side walls of the cabinet body are provided with arrayed heat dissipation grooves, the cabinet body is symmetrically provided with fire extinguishing spray plates for storing phase change fire extinguishing agent, and the fire extinguishing spray plates are made of heat-conducting composite material, two fire extinguishing spray plates form a sealed chamber for installing electrical appliances, the outer sides of the two fire extinguishing spray plates are provided with heat dissipation plates, and the heat dissipation plates can slide along the height direction of the fire extinguishing spray plates, which can drive the fire extinguishing spray plates to release fire extinguishing agent by the gravity of the heat dissipation plates under pressure in case of fire, traction ropes are arranged in the cabinet body to keep the two heat dissipation plates in a suspended state, the cabinet body is provided with a cutting assembly for cutting the traction ropes, and the sealed chamber is provided with a fire condition monitoring assembly for controlling the cutting assembly.

[0007] Further, the fire extinguishing spray plate comprises a hollow heat-conducting partition plate, the heat-conducting partition plate is uniformly provided with spray holes on the side facing the sealed chamber, and the spray holes are provided with paraffin plugs, a piston plate is slidably arranged in the heat-conducting partition plate in the horizontal direction, and a lever is hinged to the side of the heat-conducting partition plate away from the spray holes, one end of the lever abuts against the piston plate, and the other end of the lever extends below the heat dissipation plate.

[0008] Further, the heat-conducting partition plate is provided with a heat-conducting framework, and the heat-conducting framework is provided with a plurality of accommodating holes for storing phase change fire extinguishing agent, and a plunger rod is integrally formed on one side of the piston plate and matched with the accommodating holes.

[0009] Further, the port outside the spray hole is provided with a liquid distribution net plate, and the liquid distribution net plate is threadedly connected with the heat-conducting partition plate.

[0010] Further, the phase change fire extinguishing agent is perfluorohexone liquid, and the perfluorohexone liquid is added with 5-10% expanded graphite by mass fraction, and the particle diameter of the expanded graphite is 50-100 μm.

[0011] Further, the heat dissipation plate comprises a counterweight plate, the upper end of the counterweight plate is fixedly connected with the traction rope, the lower end of the counterweight plate is provided with an opening slot for clamping the outer side of the extended end of the lever, the front and rear sides of the counterweight plate are uniformly provided with heat dissipation fins, the outer side of the upper part of the heat-conducting partition plate is provided with a guide sliding groove, and the upper part of the counterweight plate is provided with a guide block matched with the guide sliding groove.

[0012] Further, the cross section of the heat dissipation fin is corrugated, and the corrugation directions of adjacent heat dissipation fins are opposite.

[0013] Further, the cutting assembly comprises a mounting seat, a cutting plate, an elastic sheet and an electromagnetic pulling rod, the mounting seat is fixed to the inner top of the cabinet and located between the two fire extinguishing spray plates, one end of the cutting plate is rotationally connected with the mounting seat through a rotating shaft, and the other end is a free end and corresponds to the middle position of the traction rope; one end of the elastic sheet is fixed to the mounting seat, and the other end abuts against the inner side wall of the cutting plate, so as to make the elastic force of the cutting plate blade part away from the traction rope, the electromagnetic pulling rod for driving the blade part to cut the traction rope is installed on the mounting seat, and the electromagnetic pulling rod is electrically connected with the fire monitoring assembly.

[0014] Further, the fire monitoring assembly comprises temperature sensors and a flame detector, the temperature sensors are uniformly arranged in the sealed chamber, the flame detector is fixed to the top center of the sealed chamber, and the temperature sensors and the flame detector are connected in series and electrically connected with the control end of the cutting assembly.

[0015] The beneficial effects of the present application are as follows:

[0016] 1. The electric vehicle charging pile with fire extinguishing and flame-retardant structure disclosed by the present application is fully sealed and dustproof, and dust intrusion is eliminated, the electrical elements are packaged in the sealed chamber through the two fire extinguishing spray plates made of heat-conducting composite material, the cabinet only retains the outer heat dissipation chamber, heat dissipation of the electrical elements is realized through heat conduction and dissipation of the fire extinguishing spray plates, and the problems of circuit short circuit and high thermal resistance of the heat dissipation fins caused by dust accumulation are avoided.

[0017] 2. The electric vehicle charging pile with fire extinguishing and flame-retardant structure disclosed by the present application has a mechanical structure of falling driving of the self-weight of the heat dissipation plate and release of the phase-change fire extinguishing agent of the fire extinguishing spray plate, and does not need external power supply, so that even if the charging pile is powered off due to fire, the fire can still be reliably triggered, and the power failure problem of the traditional electrically driven fire extinguishing system is solved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described below with reference to the drawings.

[0019] Figure 1 is a perspective view of the present application;

[0020] Figure 2 is a front view of the present application;

[0021] Figure 3 is Figure 2 a cross-sectional structure schematic view at A-A in the present application;

[0022] Figure 4 is Figure 3 a local enlarged view at B in the present application;

[0023] Figure 5 is a half-perspective view of the fire extinguishing spray plate in the present application;

[0024] Figure 6yes Figure 5 Enlarged view of a section at point C;

[0025] Figure 7 This is a half-sectional perspective view of the fire extinguishing spray plate in Embodiment 2 of the present invention;

[0026] Figure 8 yes Figure 7 Enlarged view of a section at point D;

[0027] Figure 9 This is a three-dimensional view of the heat-conducting skeleton in Embodiment 2 of the present invention.

[0028] In the diagram: 1. Cabinet; 2. Fire extinguishing spray plate; 3. Heat sink plate; 4. Traction rope; 5. Sealed chamber; 6. Receiving hole; 7. Liquid distribution mesh plate; 8. Mounting base; 9. Cut-off plate; 10. Spring; 11. Electromagnetic traction rod; 12. Temperature sensor; 13. Flame detector; 20. Thermally conductive baffle; 21. Paraffin plug; 22. Piston plate; 23. Lever; 24. Thermally conductive frame; 25. Plunger rod; 30. Counterweight plate; 31. Heat dissipation fins; 32. Guide block. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0030] Example 1: As Figures 1-2 As shown, the electric vehicle charging pile with fire extinguishing and flame retardant structure of this invention includes a cabinet 1. The left and right side walls of the cabinet 1 are provided with arrayed heat dissipation slots. The cabinet 1 is symmetrically provided with fire extinguishing spray plates 2 for storing phase change fire extinguishing agents. The fire extinguishing spray plates 2 are made of thermally conductive composite material. The two fire extinguishing spray plates 2 form a sealed chamber 5 for installing electrical appliances in the cabinet 1, avoiding the problems of short circuits and increased thermal resistance of heat sinks caused by dust accumulation.

[0031] like Figures 2-4As shown, the cabinet 1 is arranged with a traction rope 4 that makes the two heat dissipation plates 3 in a suspended state, the cabinet 1 is provided with a cutting assembly for cutting the traction rope 4, the cutting assembly includes a mounting seat 8, a cutting plate 9, a spring piece 10 and an electromagnetic pulling rod 11, the mounting seat 8 is fixed to the top of the cabinet 1 and located between the two fire extinguishing spray plates 2, one end of the cutting plate 9 is rotatably connected with the mounting seat 8, the other end is a free end and corresponds to the middle position of the traction rope 4, one end of the spring piece 10 is fixed to the mounting seat 8, the other end abuts the inner side wall of the cutting plate 9, for the elastic force of the cutting plate 9 blade part away from the traction rope 4, the electromagnetic pulling rod 11 for driving the cutting plate 9 to cut the traction rope 4 is installed on the mounting seat 8, and the electromagnetic pulling rod 11 is electrically connected with the fire monitoring assembly, the occurrence of fire is monitored through the fire monitoring assembly, the electromagnetic pulling rod 11 is controlled to be turned on by the power supply circuit, so that the electromagnetic pulling rod 11 is powered to pull down the cutting plate 9, so that the cutting plate 9 deforms by pressing the spring piece 10, and the blade part cuts the traction rope 4, so that the two heat dissipation plates 3 respectively slide downward under the action of their own weight.

[0032] As shown in Figure 2 , Figure 5 and Figure 6 , the outer side of the two fire extinguishing spray plates 2 is provided with a heat dissipation plate 3, and the heat dissipation plate can slide along the height direction of the fire extinguishing spray plate 2, which can drive the fire extinguishing spray plate 2 to release fire extinguishing by gravity when fire occurs, wherein the fire extinguishing spray plate 2 includes a hollow heat-conducting partition plate 20, the heat-conducting partition plate 20 is uniformly provided with spray holes on the side facing the sealed chamber 5, and the spray holes are provided with paraffin plugs 21, the heat-conducting partition plate 20 is slidably provided with a piston plate 22 in the horizontal direction, and the heat-conducting partition plate 20 is hingedly provided with a lever 23 away from the spray hole, one end of the lever 23 abuts against the piston plate 22, the other end of the lever 23 extends below the heat dissipation plate 3, the configuration plate 30 of the heat dissipation plate 3 presses the extended end of the lever 23, thereby making the other end of the lever 23 push the piston plate 22 to push the liquid phase-change fire extinguishing agent stored in the heat-conducting partition plate 20, so that the phase-change fire extinguishing agent pushes out the paraffin plug 21 and is discharged from the spray hole, the sprayed phase-change fire extinguishing agent absorbs the heat of the fire point and quickly vaporizes, at the same time, the vaporization generates a fire-retardant component that avoids reignition, and compared with the traditional dry powder fire extinguishing, the fire-retardant does not need to clean the electrical elements, which is convenient for later maintenance and recovery.

[0033] As shown in Figure 2 , the sealed chamber 5 is provided with a fire monitoring assembly for controlling the cutting assembly, and the fire monitoring assembly is designed to be composed of a temperature sensor 12 and a flame detector 13, the temperature sensor 12 is uniformly arranged in the sealed chamber 5, and the flame detector 13 is fixed to the top center of the sealed chamber 5, and the temperature sensor 12 and the flame detector 13 are connected in series and electrically connected with the control end of the cutting assembly, so that the judgment of fire is more accurate and the error of single fire monitor is avoided.

[0034] As Figure 4 and Figure 6 As shown in the figure, the nozzle outer side port is provided with a distribution net plate 7, and the distribution net plate 7 is threadedly connected with the heat conduction partition plate 20, so that the liquid phase change extinguishing agent released during extinguishing is sprayed more uniformly.

[0035] In the implementation process, it is found that the heat conduction efficiency of the phase change extinguishing agent is low, so the perfluorohexanone liquid is selected as the phase change extinguishing agent, and 5-10% of the expanded graphite by mass is added into the perfluorohexanone liquid, and the particle diameter of the expanded graphite is controlled within the range of 50-100 μm, so as to improve the heat conduction efficiency of the perfluorohexanone liquid as the extinguishing agent by the expanded graphite.

[0036] As Figure 2 and Figure 5 As shown in the figure, the heat dissipation plate 3 includes a counterweight plate 30, the upper end of the counterweight plate 30 is fixedly connected with the traction rope 4, and the lower end of the counterweight plate 30 is provided with an opening groove for clamping the outer side of the extended end of the lever 23, the front and rear sides of the counterweight plate 30 are uniformly provided with heat dissipation fins 31, the outer side upper part of the heat conduction partition plate 20 is provided with a guide sliding groove, and the upper part of the counterweight plate 30 is provided with a guide block 32 matched with the guide sliding groove, the heat is radiated to the adjacent heat dissipation fins 31 through the heat conduction partition plate 20, the area of heat exchange with air is increased to improve the heat dissipation efficiency, and the extinguishing power during fire is driven by the self-weight of the counterweight plate 30.

[0037] The transverse section of the heat dissipation fin 31 is designed as a corrugated shape, and the corrugated directions of the adjacent heat dissipation fins 31 are opposite, so that when the natural wind enters the heat dissipation cavity through the cabinet heat dissipation through slot, the corrugated heat dissipation fin 31 changes the airflow direction, generates “vortex flow” from the originally smooth airflow, forcibly breaks the air boundary layer on the heat dissipation surface, and makes the high-temperature air (close to the heat dissipation plate) and the low-temperature air (from the outside) quickly mix to accelerate heat exchange.

[0038] Example two: as Figures 7-9 shown, compared with example one, another embodiment of the present application is:

[0039] In the implementation process, it is found that the heat conduction efficiency of the perfluorohexanone liquid as the phase change extinguishing agent is low, in order to solve the above problem, the heat conduction skeleton 24 is increased in the heat partition plate 20, and a plurality of containing holes 6 for storing the phase change extinguishing agent are arranged on the heat conduction skeleton 24, and the plunger rod 25 matched with the containing hole 6 is integrally formed on one side of the piston plate 22, so as to improve the heat conduction efficiency of the two sides of the heat conduction partition plate 20 by increasing the heat conduction skeleton 24 and the plunger rod 25.

[0040] Working principle: in normal working state, the inner cavity of the cabinet 1 is divided into two heat dissipation chambers and a sealed chamber 5 for installing electrical elements by the fire extinguishing spray plate 2, the heat generated by the electrical elements is absorbed by the inner side of the heat-conducting partition plate 20 of the fire extinguishing spray plate 2 and is transmitted to the outer side of the heat-conducting partition plate 20 through the liquid phase change fire extinguishing agent, at the same time, the air outside the cabinet 1 of the charging pile enters the heat dissipation chamber through the heat dissipation channel, the air is disturbed after contacting the heat dissipation fins 31 of the heat dissipation plate 3, so that the heat transfer between the air and the outer side of the heat-conducting partition plate 20 is more rapid and uniform, the heat dissipation efficiency of the heat dissipation plate 3 is improved, at the same time, the heat-conducting partition plate 20 is used to avoid the aging phenomenon caused by the contact between dust in the air and the electrical elements, and the contradiction between heat dissipation and dust prevention in the traditional air cooling heat dissipation is solved.

[0041] When a fire occurs, the temperature sensor 12 detects the abnormal temperature of the fire point in the sealed chamber 5, and the flame detector 13 detects the fire point, so that the electromagnetic pull rod 11 is powered to pull down the cutting plate 9, the cutting plate 9 is deformed under the pressure of the spring 10, and the cutting edge part cuts the traction rope 4, so that the two heat dissipation plates 3 slide downward under the action of their own weight, the configuration plate 30 of the heat dissipation plate 3 presses the extension end of the lever 23, and then the other end of the lever 23 pushes the piston plate 22 to push the liquid perfluoroketone liquid stored in the heat-conducting partition plate 20, so that the perfluoroketone liquid pushes the paraffin plug 21 out and releases and discharges from the spray hole, and the distribution net plate 7 is used to make the sprayed perfluoroketone liquid cover a larger and more uniform area, the sprayed perfluoroketone liquid absorbs the heat of the fire point and quickly gasifies, and the gasification generates the flame-retardant component of fluorocarbon free radical.

[0042] The above front, rear, left, right, top and bottom are based on the drawings of the specification Figure 1 As a standard, the side facing the observer is defined as the front, the left side of the observer is defined as the left, and the like.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application.

[0044] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An electric vehicle charging pile with a fire-extinguishing and flame-retardant structure, comprising a cabinet (1), wherein the left and right side walls of the cabinet (1) are provided with arrayed heat dissipation slots, characterized in that: The cabinet (1) is symmetrically provided with fire extinguishing spray plates (2) for storing phase change fire extinguishing agents. The fire extinguishing spray plates (2) are made of thermally conductive composite material. The two fire extinguishing spray plates (2) form a sealed chamber (5) for installing electrical appliances in the cabinet (1). The two fire extinguishing spray plates (2) are provided with heat dissipation plates (3) on the outside. The heat dissipation plates can slide along the height direction of the fire extinguishing spray plates (2). In case of fire, the fire extinguishing spray plates (2) can be released to extinguish the fire by the downward pressure of the heat dissipation plates (3). The cabinet (1) is provided with traction ropes (4) that make the two heat dissipation plates (3) suspended. The cabinet (1) is provided with a cutting component for cutting the traction ropes (4). The sealed chamber (5) is provided with a fire monitoring component for controlling the cutting component. The fire extinguishing spray plate (2) includes a hollow heat-conducting baffle (20). The heat-conducting baffle (20) has spray holes evenly opened on the side facing the sealed chamber (5), and a paraffin plug (21) is provided in the spray hole. A piston plate (22) is slidably provided in the heat-conducting baffle (20) along the horizontal direction. A lever (23) is hinged on the side of the heat-conducting baffle (20) away from the spray hole. One end of the lever (23) abuts against the piston plate (22), and the other end of the lever (23) extends to the bottom of the heat dissipation plate (3).

2. The electric vehicle charging pile with a fire-extinguishing and flame-retardant structure according to claim 1, characterized in that: The heat-conducting baffle (20) is provided with a heat-conducting skeleton (24), and the heat-conducting skeleton (24) is provided with a plurality of receiving holes (6) for storing phase change extinguishing agents. The piston plate (22) has a plunger rod (25) integrally formed on one side that is adapted to the receiving hole (6).

3. The electric vehicle charging pile with a fire-extinguishing and flame-retardant structure according to claim 2, characterized in that: The outer port of the nozzle is provided with a liquid distribution mesh plate (7), and the liquid distribution mesh plate (7) is threadedly connected to the heat-conducting partition plate (20).

4. The electric vehicle charging pile with a fire-extinguishing and flame-retardant structure according to claim 3, characterized in that: The phase change extinguishing agent is perfluorohexanone liquid, and the perfluorohexanone liquid contains 5-10% by mass of expanded graphite with a particle diameter of 50-100μm.

5. The electric vehicle charging pile with a fire-extinguishing and flame-retardant structure according to claim 4, characterized in that: The heat dissipation plate (3) includes a counterweight plate (30). The upper end of the counterweight plate (30) is fixedly connected to the traction rope (4), and the lower end of the counterweight plate (30) has an opening groove for locking onto the outside of the extension end of the lever (23). Heat dissipation fins (31) are evenly arranged on the front and rear sides of the counterweight plate (30). A guide groove is provided on the upper part of the outer side of the heat-conducting partition plate (20), and a guide block (32) adapted to the guide groove is provided on the upper part of the counterweight plate (30).

6. The electric vehicle charging pile with a fire-extinguishing and flame-retardant structure according to claim 5, characterized in that: The cross-section of the heat dissipation fins (31) is corrugated, and the corrugation directions of adjacent heat dissipation fins (31) are opposite.

7. The electric vehicle charging pile with a fire-extinguishing and flame-retardant structure according to claim 1, characterized in that: The cutting component includes a mounting base (8), a cutting plate (9), a spring (10), and an electromagnetic traction rod (11). The mounting base (8) is fixed to the top of the cabinet (1) and is located between two fire extinguishing spray plates (2). One end of the cutting plate (9) is rotatably connected to the mounting base (8) through a rotating shaft, and the other end is a free end corresponding to the middle position of the traction rope (4). One end of the spring (10) is fixed to the mounting base (8), and the other end abuts against the inner side wall of the cutting plate (9) to make the cutting edge of the cutting plate (9) move away from the elastic force of the traction rope (4). The mounting base (8) is equipped with an electromagnetic traction rod (11) for driving the cutting edge to cut the traction rope (4), and the electromagnetic traction rod (11) is electrically connected to the fire monitoring component.

8. The electric vehicle charging pile with a fire-extinguishing and flame-retardant structure according to claim 1, characterized in that: The fire monitoring component includes a temperature sensor (12) and a flame detector (13). The temperature sensor (12) is evenly distributed in the sealed chamber (5), and the flame detector (13) is fixed at the top center of the sealed chamber (5). The temperature sensor (12) and the flame detector (13) are connected in series and electrically connected to the control terminal of the connection cutoff component.

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