A built-in overheat fire extinguishing protection device for charging pile

Abstract

The application belongs to the technical field of charging pile safety protection, and discloses a built-in overheat fire extinguishing protection device for charging pile, which comprises a fixing frame and an extension frame installed at the bottom of the fixing frame, a plurality of independent accommodating cavities are formed on the extension frame, the accommodating cavities are used for fixing fire extinguishing assemblies, the fire extinguishing assembly comprises a fire extinguishing agent storage box and a triggering device, a spraying opening is formed on the fire extinguishing agent storage box, a baffle for closing the spraying opening is slidably connected at the spraying opening, the triggering device comprises a fixed plate and a thermal element, one end of the thermal element is installed on the fixed plate, the adjustable extension frame is arranged, a plurality of independent accommodating cavities are formed on the extension frame, the horizontal and vertical spans can be flexibly adjusted according to the internal space size of the charging pile, the fire extinguishing assemblies are respectively installed in the accommodating cavities, the independent protection of a plurality of potential overheating areas in the charging pile can be realized, and the fire extinguishing coverage is more accurate.

Description

Technical Field

[0001] This invention belongs to the field of charging pile safety protection technology, specifically relating to a built-in overheat fire extinguishing protection device for charging piles. Background Technology

[0002] With the increasing popularity of new energy vehicles, the frequency of use and distribution density of charging piles, as the core equipment for replenishing the energy of electric vehicles, are continuously increasing. During long-term operation, problems such as aging of internal electronic components, short circuits, or overloads can easily lead to internal overheating and even fires. Currently, fire protection measures for charging piles mostly involve installing fire extinguishers or fire extinguishing pads inside. However, existing fire extinguishing devices are mostly fixed structures, large in size, and difficult to adapt to the compact internal space of charging piles; moreover, their fixed installation positions cannot be flexibly adjusted to cover potential heat sources in different areas. Furthermore, existing fire extinguishing triggering mechanisms are often complex in structure and slow in response, making it difficult to quickly and effectively release extinguishing agents in the early stages of a fire, leading to the spread of the fire and causing greater property damage. Summary of the Invention

[0003] In view of this, in order to solve the problems mentioned in the background art, the purpose of the present invention is to provide a built-in overheat fire extinguishing protection device for charging piles.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A built-in overheat fire extinguishing protection device for charging piles includes: Fixture; A telescopic frame is installed at the bottom of the fixed frame; the telescopic frame has multiple independent receiving cavities. A fire extinguishing assembly is fixed in the receiving cavity; the fire extinguishing assembly includes a fire extinguishing agent storage box and a triggering device, the fire extinguishing agent storage box is provided with a spray nozzle and a baffle that can slide to open and close the spray nozzle, and the triggering device includes a fixing plate and a thermal element connected between the fixing plate and the baffle. The thermal element is constructed as follows: When the internal temperature of the charging pile is below a threshold, it maintains the prefabricated configuration to provide the baffle with a first driving force to slide and close the spray nozzle. When the internal temperature of the charging pile exceeds a threshold, thermal deformation occurs, which provides a second driving force for the baffle to slide and open the spray nozzle.

[0005] Preferably, the extinguishing agent storage box has a cuboid structure, and when the extinguishing agent storage box is installed on the telescopic frame, the spray nozzle faces downward.

[0006] Preferably, the telescopic frame includes multiple horizontal fixing rods and multiple vertical fixing rods, each of the vertical fixing rods passing vertically through each of the horizontal fixing rods. Each horizontal fixing rod and each vertical fixing rod includes an outer sleeve and an inner sliding rod. The inner sliding rod is inserted into the outer sleeve and can slide relative to it. Multiple receiving cavities are respectively formed around the intersection of each of the horizontal fixing rods and the vertical fixing rods.

[0007] Preferably, each of the inner slide rods is provided with a fixing groove, and the telescopic frame also includes four connecting rods. The connecting rods are fixed to the inner slide rods through the fixing grooves on adjacent sides, and the four connecting rods are connected to each other to close the outer edge of the outermost receiving cavity.

[0008] Preferably, the connecting rod has multiple threaded holes on its inner side and both sides of the outer sleeve and the inner slide rod, and the extinguishing agent storage box also has threaded holes; the device further includes a fixing ring and a spring hook, the fixing ring being screwed onto the connecting rod, the outer sleeve, the inner slide rod and the extinguishing agent storage box respectively through the threaded holes; the spring hook is connected between the fixing ring located on the connecting rod, the outer sleeve or the inner slide rod and the fixing ring located on the extinguishing agent storage box, for fixing the extinguishing agent storage box in the receiving cavity.

[0009] Preferably, the fixing plate includes two horizontal fixing plates and two vertical fixing plates, the two horizontal fixing plates and the two vertical fixing plates are connected in a surrounding manner, and the thermal element is fixedly installed on the vertical fixing plate.

[0010] Preferably, the inner sides of both transverse fixing plates are equipped with outer ball bearing slide rails, and the two sides of the baffle are equipped with inner ball bearing slide rails. The baffle is slidably connected between the two transverse fixing plates through the cooperation of the outer ball bearing slide rails and the inner ball bearing slide rails.

[0011] Preferably, the outer ball slide rail has rolling element grooves along its length, and the inner ball slide rail has circulating rolling element channels corresponding to the rolling element grooves. Multiple rolling elements are installed in the rolling element channels, and the inner ball slide rail slides relative to the outer ball slide rail by the rolling elements rolling in the rolling element grooves.

[0012] Preferably, U-shaped fixing frames are installed on both sides of the fixing frame, and multiple mounting holes are evenly opened on the horizontal end of the U-shaped fixing frame along its length direction. The mounting holes are used to fix the fixing frame to the top of the charging pile by fasteners, so as to install the fixing frame on the top of the charging pile.

[0013] Preferably, the bottom of the fixed frame is provided with a dovetail groove, and the top of the telescopic frame is equipped with a dovetail slider that cooperates with the dovetail groove. The telescopic frame is detachably installed on the fixed frame through the sliding cooperation between the dovetail slider and the dovetail groove.

[0014] Compared with the prior art, the present invention has the following advantages: (1) The present invention is equipped with an adjustable telescopic frame, which forms multiple independent accommodating cavities. The horizontal and vertical spans can be flexibly adjusted according to the internal space size of the charging pile. By installing fire extinguishing components in each accommodating cavity, the independent protection of multiple potential overheated areas inside the charging pile can be achieved, making the fire extinguishing coverage more precise.

[0015] (2) The present invention uses a thermal element as a triggering device. When the internal temperature of the charging pile rises to a preset threshold, the thermal element is heated and deformed to generate displacement, which drives the baffle to automatically open the spray port to release the fire extinguishing agent. The device does not require an external power supply or complex control circuit, and has a fast response speed and high reliability.

[0016] (3) The present invention uses a fixing ring and a spring hook to detachably fix the fire extinguishing agent storage box in the receiving cavity of the telescopic frame, which makes installation, maintenance and replacement more convenient; at the same time, the spray nozzle of the fire extinguishing agent storage box is set downward, which can use gravity to assist the fire extinguishing agent to spray out, thereby improving the fire extinguishing efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the horizontally installed fire extinguishing assembly of the present invention; Figure 2 This is a schematic diagram of the vertical installation structure of the fire extinguishing component of the present invention; Figure 3 This is a schematic diagram of the telescopic frame of the present invention; Figure 4 This is a schematic diagram of the transverse fixing rod of the present invention; Figure 5 This is a schematic diagram of the fire extinguishing component of the present invention; Figure 6 This is a schematic diagram of the fire extinguishing agent storage box of the present invention with the spray nozzle in the closed state; Figure 7 This is a schematic diagram of the fire extinguishing agent storage box of the present invention with the spray nozzle in the open state; Figure 8 This is an exploded view of the fire extinguishing component of the present invention; Figure 9 This is a schematic diagram of the sliding fit between the outer ball bearing slide rail and the inner ball bearing slide rail of the present invention. Figure 10 for Figure 9 Enlarged view of point A; In the diagram: 1-Fixed frame; 11-U-shaped fixed frame; 2-Telescopic frame; 21-Accommodation cavity; 22-Horizontal fixed rod; 221-Outer sleeve; 222-Inner slide rod; 223-Fixed groove; 23-Vertical fixed rod; 24-Connecting rod; 3-Firing assembly; 31-Firing agent storage box; 311-Spray nozzle; 312-Baffle; 32-Triggering device; 321-Fixed plate; 3211-Horizontal fixed plate; 3212-Vertical fixed plate; 322-Thermosensitive element; 4-Fixed ring; 5-Spring hook; 6-Outer ball bearing slide rail; 61-Rolling element groove; 7-Inner ball bearing slide rail; 71-Circulating rolling element channel; 72-Rolling element. Detailed Implementation

[0019] To further understand the content of this invention, a detailed description of the invention is provided in conjunction with the accompanying drawings and embodiments. The structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art, and are not intended to limit the implementation conditions of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention. It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein.

[0020] Please see Figure 1 and Figure 3As shown, the present invention provides the following technical solution: a built-in overheat fire extinguishing protection device for charging piles, including a fixed frame 1 and a telescopic frame 2 installed at the bottom of the fixed frame 1. The telescopic frame 2 can flexibly adjust the horizontal coverage of the fire extinguishing component 3 according to the layout density and position of the electrical components inside the charging pile. The fixed frame 1 has a rectangular structure, and U-shaped fixed frames 11 are symmetrically installed on the left and right poles of the fixed frame 1. The opening of the U-shaped fixed frame 11 is set downward. This inverted structure design can effectively avoid electrical components or wiring channels that may exist on the top of the charging pile, and avoid interference during installation. The horizontal end of the U-shaped fixed frame 11 is evenly provided with multiple mounting holes along its length. The mounting holes are used to fix the device to the top of the charging pile with fasteners, such as bolts, so that the entire device can be installed on the inner top wall of the charging pile or other suitable positions.

[0021] Regarding the specific structure of telescopic frame 2: please refer to... Figure 1 and Figure 2 As shown, the telescopic frame 2 includes two horizontal fixing rods 22 and two vertical fixing rods 23. The two vertical fixing rods 23 pass vertically through the two horizontal fixing rods 22, forming a grid-like skeleton structure. The two horizontal fixing rods 22 and the two vertical fixing rods 23 each include an outer sleeve 221 and inner sliding rods 222 set at both ends of the outer sleeve 221. The inner sliding rods 222 are inserted into the outer sleeve 221 and can slide with damping relative to the outer sleeve 221. By adjusting the extension length of the inner sliding rods 222, the horizontal and vertical dimensions of the telescopic frame 2 can be changed to adapt to the internal space of different models of charging piles. There is no need to customize different sized brackets for different models of charging piles. The two horizontal fixing rods 22 and the two vertical fixing rods 23 are cross-connected to form nine independent receiving cavities 21. Each receiving cavity 21 is roughly rectangular.

[0022] In one executable embodiment, reference is made to... Figure 3 and Figure 4 As shown, in order to strengthen the edge structure of the telescopic frame 2 and close the outermost receiving cavity 21, each inner slide rod 222 is provided with a fixing groove 223. The telescopic frame 2 also includes four connecting rods 24. The connecting rods 24 are fixed to the inner slide rods 222 through the fixing grooves 223 on the adjacent side, and the four connecting rods 24 are connected to each other and abut against each other, thereby closing the outer edge of the outermost receiving cavity 21.

[0023] In one executable embodiment, reference is made to... Figure 1 , Figure 3 and Figure 4As shown, each receiving cavity 21 is used to fix a set of fire extinguishing components 3. The fire extinguishing components 3 are fixed in the receiving cavity 21 as follows: multiple threaded holes are opened on the inner side of the connecting rod 24 and on both sides of the outer sleeve 221 and the inner slide rod 222. Threaded holes are also opened on the fire extinguishing components 3. As shown in the figure, the fire extinguishing components 3 have two threaded holes on both sides. At the same time, this fire extinguishing device also includes a fixing ring 4 and a spring hook 5. The fixing ring 4 is a ring with a threaded fixing rod, which is screwed onto the connecting rod 24, the outer sleeve 221, the inner slide rod 222 and the fire extinguishing components 3 through the threaded holes. The spring hook 5 is an elastic hook-shaped piece with hooks connected to both ends. The length of the fixing ring 4 can be prepared according to different lengths of fixing ring 4 as needed, so as to adjust the position of the fire extinguishing components 3 installed in the receiving cavity 21. For example, when the fixing ring 4 on one side is longer than the fixing ring on the other side, the installation position of the fire extinguishing components 3 in the receiving cavity 21 is closer to the side with the shorter fixing ring 4.

[0024] Continue to refer to Figure 1 , Figure 3 and Figure 4 As shown, in this embodiment, when the fire extinguishing assembly 3 needs to be horizontally fixed in the receiving cavity 21, four fixing rings 4 are screwed onto the outer sleeve 221 of the horizontal fixing rod 22 and the connecting rod 24 opposite to the horizontal fixing rod 22 or the outer sleeve 221 of another horizontal fixing rod 22. At the same time, anti-loosening nuts are installed on the contact surface of the threaded connection to prevent loosening. Then, the four fixing rings 4 are fixed on both sides of the fire extinguishing assembly 3. Then, four spring hooks 5 are connected to the fire extinguishing agent storage box 31 and the connecting rod 24, and the outer sleeve 221 of the horizontal fixing rod 22 and the outer sleeve 221 of another horizontal fixing rod 22, thus completing the horizontal fixing of the fire extinguishing assembly 3.

[0025] In another executable embodiment, when the charging pile is large and the length of the telescopic frame 2 needs to be extended to match the larger fire extinguishing component 3, in order to adapt to the length of the charging pile, the inner sliding rod 222 is pulled out from the outer sleeve 221 to a suitable length, and then four fixing rings 4 are screwed onto the outer sleeve 221 and inner sliding rod 222 of the transverse fixing rod 22 and the connecting rod 24 opposite to the transverse fixing rod 22 or the outer sleeve 221 and inner sliding rod 222 of another transverse fixing rod 22. At this time, the two fixing rings 4 located on the transverse fixing rod 22 are respectively installed on the outer sleeve 221 and inner sliding rod 222. Then, the four fixing rings 4 are fixed on both sides of the fire extinguishing component 3, and the fire extinguishing component 3 is hooked to the fixing rings 4 on the transverse fixing rod 22 and the connecting rod 24 by four spring hooks 5.

[0026] In this embodiment, reference Figure 1 , Figures 3-5As shown, one end of the spring hook 5 is hooked onto the fixing ring 4 located on the connecting rod 24, the outer sleeve 221 or the inner slide rod 222, and the other end is hooked onto the fixing ring 4 located on the fire extinguishing assembly 3. The fire extinguishing assembly 3 is detachably fixed in the receiving cavity 21 by the pulling force of the spring hook 5. When the fire extinguishing assembly 3 needs to be replaced, the spring hook 5 can be removed.

[0027] In another executable embodiment, when vertical fixation is required within the receiving cavity 21, the fixing principle is the same as the horizontal fixing principle, and the effect after fixation is as follows: Figure 2 As shown, it will not be elaborated further here.

[0028] In the above embodiments, during the operation of the charging pile, the internal fan or relay may generate slight vibrations. If a rigid connection is used, long-term vibration can easily lead to loosening of the threaded connection or fatigue of the storage box structure. However, the spring hook 5 used in this embodiment can absorb vibration energy by its own elastic deformation, play a role in buffering and shock absorption, and ensure that the fire extinguishing agent storage box 31 remains stable in the vibration environment.

[0029] In one executable embodiment, such as Figures 6-8 As shown, the fire extinguishing assembly 3 includes an extinguishing agent storage box 31 and a triggering device 32. The threaded holes described in the above embodiments on the fire extinguishing assembly 3 are all located on the body of the extinguishing agent storage box 31. The extinguishing agent storage box 31 has a cuboid structure and is pre-filled with extinguishing agents such as dry powder or aerosol. When using liquid extinguishing agents such as heptafluoropropane as the filling extinguishing agent, the extinguishing agent storage box 31 needs to be a high-pressure storage box, and the sealing of the extinguishing agent storage box 31 must be ensured to prevent the heptafluoropropane from being used. In case of alkane leakage, a spray nozzle 311 is provided at the bottom. Two sets of baffles 312 are slidably connected to the spray nozzle 311. The two sets of baffles 312 are arranged at different heights, that is, the bottom of one baffle 312 and the top of the other baffle are on the same horizontal plane to avoid interference when moving. Each set of baffles 312 includes a horizontal baffle and a vertical baffle. The horizontal baffle is used to close the spray nozzle 311. When the extinguishing agent storage box 31 is installed on the telescopic frame 2, the spray nozzle 311 faces the potential fire area below.

[0030] In a further executable embodiment, in order to reduce the friction of the two side baffles 312 during relative sliding, the surfaces of the two side baffles 312 are smooth and flat. At the same time, in order to further reduce the friction, guide rails (not shown in the drawings) can be provided on the contact surfaces of the two side baffles 312 to ensure that the two side baffles 312 can slide smoothly relative to each other.

[0031] In one executable embodiment, reference continues to... Figures 6-8As shown, the triggering device 32 includes a fixing plate 321 and thermal elements 322. The fixing plate 321 includes two horizontal fixing plates 3211 and two vertical fixing plates 3212. The two horizontal fixing plates 3211 and the two vertical fixing plates 3212 are connected to form a rectangular frame. Six thermal elements 322 are installed on the inner side of each vertical fixing plate 3212. The other end of the thermal elements 322 is installed on the vertical baffle of the baffle 312. The thermal elements 322 are made of shape memory alloy or a material sensitive to thermal expansion coefficient and are configured to... When the internal temperature of the charging pile rises to a preset threshold, such as 150°C, it deforms and elongates due to heat, thereby pushing the baffles 312 on both sides to slide towards each other, opening the spray nozzles 311 that were blocked by the baffles 312 on both sides. The extinguishing agent is automatically sprayed out under the action of gravity. Since the hot air rises when a fire occurs, the extinguishing agent can penetrate the rising hot air more effectively when sprayed from top to bottom, quickly covering the fire source below. This significantly improves the utilization efficiency of the extinguishing agent and the speed of fire extinguishing, and avoids the problem of uneven diffusion or blind spots of the extinguishing agent that may be caused by side or upward spraying.

[0032] In this embodiment, in order to ensure sufficient elasticity, the number of thermal elements 322 and the elastic coefficient can be set according to the size of the fire extinguishing agent storage box 31, so that the target elasticity is 1.5-2 times the resistance, ensuring performance margin, so that the baffle 312 can be pushed open smoothly to open the spray nozzle 311 to complete the fire extinguishing operation.

[0033] In one executable embodiment, such as Figure 9 and Figure 10 As shown, in order to achieve smooth sliding of the baffle 312, the inner sides of the two transverse fixed plates 3211 are equipped with ball outer slide rails 6, and the two sides of the baffle 312 are equipped with ball inner slide rails 7. The ball outer slide rails 6 have rolling element grooves 61 opened vertically along their length. The ball inner slide rails 7 are provided with circulating rolling element channels 71 corresponding to the rolling element grooves 61 on both the upper and lower sides. Multiple rolling elements 72, such as steel balls, are symmetrically installed in the circulating rolling element channels 71. When the thermal element 322 pushes the baffle 312, the ball inner slide rails 7 roll in the rolling element grooves 61 through the rolling elements 72 and slide relative to the ball outer slide rails 6, thereby achieving low friction and high reliability linear motion.

[0034] In another feasible embodiment, the bottom of the fixed frame 1 is provided with a dovetail groove, and the top of the telescopic frame 2 is equipped with a dovetail slider (not shown in the figure) that cooperates with the dovetail groove. The telescopic frame 2 is detachably installed on the fixed frame 1 through the sliding cooperation between the dovetail slider and the dovetail groove. When it is necessary to inspect the internal circuit of the charging pile or replace the telescopic frame 2 of different specifications to adapt to the new protection requirements, the operator only needs to slide the telescopic frame 2 horizontally to remove it from the fixed frame 1 without disassembling the top fixed frame 1 or using additional tools, which significantly reduces the maintenance difficulty and operation time. At the same time, for charging piles of different widths or internal layouts, it is only necessary to replace the telescopic frame 2 with one of the corresponding size or internal cavity distribution and slide it into the standard fixed frame 1 to complete the deployment. There is no need to re-drill or modify the top of the charging pile, which realizes the flexible configuration effect of one frame for multiple uses.

[0035] Based on the charging pile built-in overheat extinguishing protection device described in any of the above embodiments, the present invention provides a charging pile built-in overheat extinguishing protection method, the specific steps of which are as follows: S1 device installation, adaptation and commissioning: First, invert the U-shaped fixing frames 11 on both sides of the fixing frame 1 onto the inner top wall of the charging pile. Secure the fixing frame 1 to the top of the charging pile by passing bolts or other fasteners through the mounting holes at the horizontal ends of the U-shaped fixing frames 11. According to the internal space dimensions of the charging pile and the distribution of electrical components, adjust the extension length of the inner sliding rods 222 of the horizontal fixing rods 22 and vertical fixing rods 23 of the telescopic frame 2 within the outer sleeve 221 so that the horizontal and vertical spans of the telescopic frame 2 are adapted to the internal space of the charging pile, and each receiving cavity 21 corresponds to the potential overheating areas such as power modules and wiring terminals inside the charging pile. Fix the four connecting rods 24 to the outermost inner sliding rod 222 of the telescopic frame 2 through the fixing grooves 223 on the inner sliding rods 222, so that the four connecting rods 24 are connected to each other and abut against each other, sealing the outer edge of the outermost receiving cavity 21. Slide the dovetail slider at the top of the telescopic frame 2 into the dovetail groove at the bottom of the fixing frame 1 to complete the detachable connection between the telescopic frame 2 and the fixing frame 1.

[0036] Subsequently, based on the protection requirements of each potential overheated area, fire extinguishing components 3 are installed in the corresponding receiving cavities 21. During installation, the fixing rings 4 are first screwed into the threaded holes of the connecting rods 24, outer sleeves 221, or inner sliding rods 222 around the receiving cavity 21, and simultaneously screwed into the threaded holes of the fire extinguishing agent storage box 31. Then, the fixing rings 4 on the telescopic frame 2 and the fixing rings 4 on the fire extinguishing agent storage box 31 are connected by spring hooks 5. The fire extinguishing agent storage box 31 is fixed in the receiving cavity 21 by the pulling force of the spring hooks 5, and the spray nozzles 311 of the fire extinguishing agent storage box 31 are ensured to face the potential overheated area below. The fire extinguishing components 3 can be installed horizontally or vertically according to the actual space requirements. After installation, the connection of each spring hook 5 is checked to ensure that the fire extinguishing agent storage box 31 remains stable under the vibration generated by the operation of the charging pile.

[0037] S2 is in normal standby mode: When the charging pile is operating normally, the internal temperature is lower than the preset deformation threshold of the thermal element 322. The thermal element 322 maintains its prefabricated configuration, providing the first driving force for the baffle 312 to slide and close the spray port 311, so that the baffle 312 tightly covers the spray port 311 of the fire extinguishing agent storage box 31, and the fire extinguishing agent storage box 31 is in a sealed state. At this time, the baffle 312 is stably maintained in the closed position through the cooperation of the inner ball slide rail 7 on both sides and the outer ball slide rail 6 on the inner side of the transverse fixed plate 3211. At the same time, the spring hook 5 absorbs the slight vibration generated by the operation of the fan and relay inside the charging pile by its own elastic deformation, avoiding loosening of the threaded connection or structural fatigue of the fire extinguishing agent storage box 31, and the device is continuously in the overheat protection standby state.

[0038] S3 Overheat Trigger and Automatic Fire Extinguishing: When a potentially overheated area inside the charging pile experiences an abnormal temperature rise due to aging electronic components, short circuits, or overloads, and the temperature of this area reaches the preset deformation threshold of the thermal element 322, the thermal element 322 of the corresponding fire extinguishing component 3 in the receiving cavity 21 undergoes thermal deformation and elongates, providing a second driving force for the baffle 312 to slide and open the spray nozzle 311. Under the thrust of the thermal element 322, the inner slide rails 7 of the ball bearings on both sides of the baffle 312 pass through the rolling elements 72 in the circulating rolling element channel 71 in the rolling element grooves of the outer slide rail 6. The 61 rolls internally, causing the baffle 312 to slide smoothly towards each other along the horizontal fixed plate 3211, quickly opening the spray nozzle 311 at the bottom of the extinguishing agent storage box 31; the extinguishing agent is sprayed from top to bottom under its own gravity, penetrating the rising hot airflow in the early stage of the fire, accurately covering the fire source below, and achieving independent fire extinguishing of the overheated area; since the extinguishing components 3 in each containment chamber 21 are independent of each other, only the extinguishing components 3 in the overheated area are triggered, while the extinguishing components 3 in other areas remain in standby state, achieving precise zonal fire extinguishing and avoiding unnecessary waste of extinguishing agent.

[0039] S4 fire extinguishing device recovery: After the fire is extinguished, a comprehensive safety inspection is carried out inside the charging pile. After confirming that there is no risk of reignition, the device is restored and maintained. During maintenance, simply remove the spring hook 5 connecting the extinguishing agent storage box 31 and the telescopic frame 2 in the corresponding receiving cavity 21 to remove the used extinguishing agent storage box 31 from the receiving cavity 21. After replacing it with a new extinguishing agent storage box 31 pre-filled with extinguishing agent, fix it back into the original receiving cavity 21 using the fixing ring 4 and the spring hook 5 to quickly restore the overheat extinguishing protection function of the area. If it is necessary to repair or replace the telescopic frame 2 with a different specification to adapt to the new protection requirements, the telescopic frame 2 can be slid horizontally so that the dovetail slider at the top of the telescopic frame 2 slides out of the dovetail groove at the bottom of the fixing frame 1. The entire disassembly and replacement of the telescopic frame 2 can be completed without disassembling the top fixing frame 1.

[0040] The above-mentioned fire extinguishing method is based entirely on the structural features of the charging pile's built-in overheat fire extinguishing protection device. It fully leverages the device's technical advantages, such as flexible adaptation to different charging pile internal spaces, independent zone protection, fast response of pure thermal triggering, high efficiency of gravity-assisted fire extinguishing, and convenient disassembly and maintenance. It can achieve rapid, accurate, and reliable protection against overheating fires inside the charging pile.

[0041] In the description of this invention, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A built-in overheat fire extinguishing protection device for charging piles, characterized in that, include: Fixture (1); Telescopic frame (2) is installed at the bottom of the fixed frame (1); multiple independent receiving cavities (21) are formed on the telescopic frame (2). Fire extinguishing assembly (3) is fixed in the receiving cavity (21); the fire extinguishing assembly (3) includes a fire extinguishing agent storage box (31) and a triggering device (32). The fire extinguishing agent storage box (31) is provided with a spray nozzle (311) and a baffle (312) that can slide to open and close the spray nozzle (311). The triggering device (32) includes a fixing plate (321) and a heat-sensitive element (322) connected between the fixing plate (321) and the baffle (312). The thermistor (322) is constructed as follows: When the internal temperature of the charging pile is below a threshold, the prefabricated configuration is maintained to provide the baffle (312) with a first driving force to slide and close the spray nozzle (311); When the internal temperature of the charging pile exceeds the threshold, thermal deformation occurs to provide a second driving force for the baffle (312) to slide open the spray nozzle (311).

2. The built-in overheat fire extinguishing protection device for a charging pile according to claim 1, characterized in that: The fire extinguishing agent storage box (31) has a cuboid structure, and when the fire extinguishing agent storage box (31) is installed on the telescopic frame (2), the spray nozzle (311) faces downward.

3. The built-in overheat fire extinguishing protection device for a charging pile according to claim 1, characterized in that: The telescopic frame (2) includes multiple horizontal fixing rods (22) and multiple vertical fixing rods (23). Each of the vertical fixing rods (23) passes vertically through each of the horizontal fixing rods (22). Both the horizontal fixing rods (21) and the vertical fixing rods (22) include an outer sleeve (221) and an inner slide rod (222). The inner slide rod (222) is inserted into the outer sleeve (221) and can slide relative to it. Multiple receiving cavities (21) are formed around the intersection of each of the horizontal fixing rods (22) and the vertical fixing rods (23).

4. The built-in overheat fire extinguishing protection device for a charging pile according to claim 3, characterized in that: Each of the inner slide bars (222) is provided with a fixing groove (223). The telescopic frame (2) also includes four connecting rods (24). The connecting rods (24) are fixed to the inner slide bars (222) through the fixing grooves (223) on the adjacent side, and the four connecting rods (24) are connected to each other to close the outer edge of the outermost receiving cavity (21).

5. A built-in overheat fire extinguishing protection device for a charging pile according to claim 4, characterized in that: Multiple threaded holes are provided on the inner side of the connecting rod (24), the outer sleeve (221), and both sides of the inner slide rod (222). Threaded holes are also provided on the extinguishing agent storage box (31). The device also includes a fixing ring (4) and a spring hook (5). The fixing ring (4) is screwed onto the connecting rod (24), the outer sleeve (221), the inner slide rod (222), and the extinguishing agent storage box (31) through the threaded holes. The spring hook (5) is connected between the fixing ring (4) located on the connecting rod (24), the outer sleeve (221), or the inner slide rod (222) and the fixing ring (4) located on the extinguishing agent storage box (31), and is used to fix the extinguishing agent storage box (31) in the receiving cavity (21).

6. The built-in overheat fire extinguishing protection device for a charging pile according to claim 1, characterized in that: The fixing plate (321) includes two horizontal fixing plates (3211) and two vertical fixing plates (3212). The two horizontal fixing plates (3211) and the two vertical fixing plates (3212) are connected in a closed manner, and the thermal element (322) is fixedly installed on the vertical fixing plate (3212).

7. A built-in overheat fire extinguishing protection device for a charging pile according to claim 6, characterized in that: The inner sides of the two transverse fixing plates (3212) are each equipped with a ball bearing outer slide rail (6), and the two sides of the baffle (312) are each equipped with a ball bearing inner slide rail (7). The baffle (312) is slidably connected between the two transverse fixing plates (3211) through the cooperation of the ball bearing outer slide rail (6) and the ball bearing inner slide rail (7).

8. A built-in overheat fire extinguishing protection device for a charging pile according to claim 7, characterized in that: The outer ball slide rail (6) has a rolling element groove (61) along its length direction. The inner ball slide rail (7) has a circulating rolling element channel (71) corresponding to the rolling element groove (61). The rolling element channel (71) contains a plurality of rolling elements (72). The inner ball slide rail (7) slides relative to the outer ball slide rail (6) by the rolling elements (72) rolling in the rolling element groove (61).

9. A built-in overheat fire extinguishing protection device for a charging pile according to claim 1, characterized in that: Both sides of the fixing frame (1) are equipped with U-shaped fixing frames (11). The horizontal end of the U-shaped fixing frame (11) is evenly provided with multiple mounting holes along its length. The mounting holes are used to fix the fixing frame (1) to the top of the charging pile through fasteners.

10. A built-in overheat fire extinguishing protection device for a charging pile according to claim 1, characterized in that: The bottom of the fixed frame (1) is provided with a dovetail groove, and the top of the telescopic frame (2) is provided with a dovetail slider that cooperates with the dovetail groove. The telescopic frame (2) is detachably installed on the fixed frame (1) through the sliding cooperation between the dovetail slider and the dovetail groove.

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