Wall-mounted waterproof charging gun for new energy automobile

Abstract

The invention provides a wall-mounted waterproof charging gun for a new energy automobile, and relates to the technical field of waterproof charging guns, the wall-mounted waterproof charging gun comprises a charging pile, a charging wire is arranged at the lower end of the charging pile, a charging gun body is arranged at the end of the charging wire, the charging pile is mounted on a wall in a wall-mounted manner, a hook is mounted on the wall, and the charging gun body is connected with the charging pile. According to the charging gun, the deformation mechanism composed of the heat conduction ring, the first metal layer and the second metal layer is arranged in the disconnecting mechanism, heat conduction silicone grease is coated among the heat conduction ring, the first metal layer and the second metal layer to strengthen heat transfer, and bending force generated by differential expansion of the double metal layers is utilized to drive the clamping pin to rotate; the trigger spring releases elastic potential energy so that the charging gun body and the gun head can be rapidly separated to achieve automatic power off, the problems of part burning, insulation failure and the like caused by high temperature are effectively avoided, and the safety of a charging system and a new energy automobile battery is guaranteed from the two aspects of active power off and passive heat dissipation.

Description

Technical Field

[0001] This invention belongs to the field of waterproof charging gun technology, and more specifically, relates to a wall-mounted waterproof charging gun for new energy vehicles. Background Technology

[0002] With the increasing popularity of new energy vehicles, wall-mounted charging guns have become the mainstream charging equipment in scenarios such as home garages and community parking lots due to their advantages such as saving ground space and convenient installation. However, the wall-mounted waterproof charging guns currently on the market for new energy vehicles still have many technical defects in actual use, making it difficult to balance safety, stability, and compatibility. Currently, wall-mounted waterproof charging guns have been found to have at least the following technical problems: 1. Existing wall-mounted waterproof charging guns mostly rely on traditional overload protection devices (such as fuses) for safety protection. However, fuses have a slow response speed and can only passively melt and cut off the power after a serious overload or short circuit occurs in the circuit. They cannot monitor the internal temperature changes of the charging gun in real time. When the internal temperature of the charging gun rises due to problems such as poor contact of the contacts or aging of the circuit (such as exceeding the 65°C safety threshold), the fuse often fails to trigger in time, which can easily cause the internal insulation layer of the charging gun to melt, the metal contacts to burn, and even cause a fire. At the same time, existing equipment lacks a matching heat dissipation structure. Under high temperature conditions, heat accumulation further aggravates the risk of component damage and seriously threatens the safety of the charging system and the batteries of new energy vehicles.

[0003] 2. During charging, if a new energy vehicle moves unexpectedly (due to user error, vehicle electrical and mechanical failure, or environmental and external interference), it will exert lateral or longitudinal pulling force on the charging gun. The existing charging gun body and head connection structure is mostly rigid (such as threaded connection, snap-fit ​​fixation), lacking an emergency structure that can be quickly separated. When the pulling force is applied, the rigid connection cannot be disconnected in time, which can easily lead to the charging cable breaking, the wall-mounted charging pile falling off the wall, or the internal circuitry of the charging gun being pulled and deformed. Although some devices have a separation structure, it requires manual triggering and cannot respond automatically in the event of a sudden pulling force, further increasing the equipment maintenance cost and safety hazards. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a wall-mounted waterproof charging gun for new energy vehicles. This addresses the issue that when the internal temperature of the charging gun rises due to poor contact or aging wiring (e.g., exceeding the 65°C safety threshold), the fuse often fails to trigger in time, easily causing the internal insulation layer of the charging gun to melt, the metal contacts to burn, and even leading to a fire.

[0005] A wall-mounted waterproof charging gun for new energy vehicles includes a charging pile, a charging cable at the lower end of the charging pile, and a charging gun body at the end of the charging cable. The charging pile is wall-mounted, and a hook is installed on the wall for placing the charging gun body and the charging gun head. Metal contacts are provided on the opposite surfaces of the charging gun body and the charging gun head. The charging gun body and the charging gun head are energized through contact between the two metal contacts. A disconnection mechanism is provided on the charging gun body and the metal contacts, and a deformation mechanism is provided inside the disconnection mechanism for opening the disconnection mechanism.

[0006] Preferably, the disconnection mechanism includes a fixed circular plate, which is fixedly mounted on the charging gun body. A rotating ring is rotatably sleeved on the fixed circular plate. Four locking pins are fixedly mounted at equal intervals on the side end of the rotating ring. The four locking pins are all L-shaped. A first fixing block is fixedly mounted on the charging gun head. The first fixing block has four spherical grooves at equal intervals on its circumference. Each spherical groove of the first fixing block contains a metal ball. A second fixing block is fixedly mounted on the charging gun body.

[0007] Preferably, four pull rods are slidably mounted on the second fixing block, and a sliding ring is fixedly mounted between the left ends of the four pull rods. The sliding ring has four rectangular through holes equidistant from each other on its circumference. The four rectangular through holes of the sliding ring correspond to four locking pins respectively. The four pull rods are fixedly mounted on four metal spheres respectively. A spring is sleeved on the surface of each of the four pull rods. The spring is located between the second fixing block and the first fixing block.

[0008] Preferably, the deformation mechanism includes a heat-conducting ring, which is press-fitted into the inner wall of the charging gun body. Four second metal layers are fixedly installed at equal intervals on the circumferential surface of the heat-conducting ring. A first metal layer is fixedly installed on the side end of each second metal layer. The first metal layer is in contact with the snap-fit ​​pin. Thermal grease is provided between the second metal layer, the first metal layer and the heat-conducting ring.

[0009] Compared with the prior art, the present invention has the following beneficial effects: In this invention, by setting a deformation mechanism consisting of a heat-conducting ring, a first metal layer (with a low coefficient of thermal expansion), and a second metal layer (with a high coefficient of thermal expansion) within the disconnection mechanism, and coating the three with thermally conductive silicone grease to enhance heat transfer, not only can the bending force generated by the differential expansion of the bimetallic layer drive the locking pin to rotate when the internal temperature of the charging gun body reaches a set threshold (e.g., 65°C), triggering the spring to release elastic potential energy and quickly separate the charging gun body from the gun head to achieve automatic power-off, but also the thermal conductivity of the heat-conducting ring and the bimetallic layer can be used to simultaneously dissipate heat inside the gun body, effectively avoiding problems such as component burnout and insulation failure caused by high temperature, thus ensuring the safety of the charging system and the new energy vehicle battery from both active power-off and passive heat dissipation aspects.

[0010] In this invention, a metal sphere is embedded in the spherical groove of the first fixing block of the charging gun head, and the metal sphere is fixedly connected to the pull rod of the charging gun body. When the car moves unexpectedly during charging and generates a pulling force exceeding the threshold, the metal sphere can detach from the spherical groove. Combined with the elastic force of the spring, the charging gun body and the gun head are quickly separated. This not only avoids the pulling force being transmitted to the wall-mounted charging pile, causing it to loosen, fall off, or the charging cable to break, thus reducing equipment maintenance costs, but also prevents the risk of leakage caused by damage to the internal circuitry of the charging gun due to forced pulling, thereby improving emergency safety during use.

[0011] In this invention, the L-shaped locking pin of the disconnecting mechanism engages with the rectangular through hole of the sliding ring, and the pre-tightening effect of the compressed spring on the charging gun body and the gun head ensures that the metal contacts of the two are always tightly fitted during normal charging. This avoids poor contact or detachment of the contacts due to slight vibration or minor vehicle displacement, ensuring stable transmission of charging current. It not only prevents local heat loss caused by poor contact and extends the service life of the charging gun contacts, but also avoids the impact of charging interruption on the charging efficiency and lifespan of new energy vehicle batteries, thus improving charging reliability.

[0012] In this invention, the charging pile is wall-mounted and hooks are installed on the wall to hold the charging gun body and head. On the one hand, it does not occupy ground space, which is especially suitable for scenarios with limited space such as community garages and family courtyards, thus optimizing the site layout. On the other hand, it can store the charging gun body and head in an orderly manner, avoiding problems such as shell wear, charging cable tangling and knotting caused by random placement, or metal contact contamination and water ingress caused by water accumulation or debris on the ground. This extends the overall service life of the equipment and improves the convenience of use.

[0013] In this invention, by designing a deformation mechanism that allows precise control of the trigger temperature through parameter adjustment (such as using a bimetallic layer composed of brass and nickel-iron alloy, and correcting the trigger temperature by changing the thickness ratio of the two metal layers, the effective length, or the position of the toggle block), it is possible to ensure that the bimetallic layer only triggers the disconnection action at the set safe temperature threshold. This avoids false triggering caused by ambient temperature fluctuations (such as high-temperature garages in summer), ensuring normal charging needs, and can also respond accurately when a real high-temperature fault occurs, avoiding safety hazards caused by untimely triggering, and improving the adaptability and safety of the device in different usage scenarios. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the charging gun body structure of the present invention; Figure 3 This is a schematic diagram of the charging gun head structure of the present invention; Figure 4 This is a schematic diagram of the first fixing block structure of the present invention; Figure 5 This is a schematic diagram of the sliding ring structure of the present invention; Figure 6 This is a schematic diagram of the fixed circular plate structure of the present invention; Figure 7 This is a schematic diagram of the heat-conducting ring structure of the present invention; Figure 8 This is a schematic diagram of the rotating ring structure of the present invention; Figure 9 This is the present invention. Figure 7 Enlarged schematic diagram of the structure at point A; Figure 10 This is the present invention. Figure 8 Enlarged schematic diagram of the structure at point B.

[0015] In the diagram, the correspondence between the component names and the attached drawing numbers is as follows: 1. Charging gun body; 2. Metal contact; 3. Charging gun head; 4. First fixing block; 5. Spherical groove; 6. Metal ball; 7. Pull rod; 8. Spring; 9. Second fixing block; 10. Sliding ring; 11. Rectangular through hole; 12. Fixing circular plate; 13. Rotating ring; 14. Snap-fit ​​pin; 15. Heat-conducting ring; 16. First metal layer; 17. Second metal layer; 19. Charging pile; 20. Charging cable; 21. Hook. Detailed Implementation

[0016] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0017] Please see Figure 1 - Figure 10 This invention provides a wall-mounted waterproof charging gun for new energy vehicles, including a charging pile 19, a charging cable 20 at the lower end of the charging pile 19, a charging gun body 1 at the end of the charging cable 20, and a charging gun head 3 at the side end of the charging gun body 1. The charging pile 19, the charging cable 20, the charging gun body 1 and the charging gun head 3 together form a charging assembly that can charge new energy vehicles. Moreover, the charging pile 19 is wall-mounted on a wall, and a hook 21 is installed on the wall for placing the charging gun body 1 and the charging gun head 3.

[0018] Metal contacts 2 are provided on the opposite surfaces of the charging gun body 1 and the charging gun head 3. The charging gun body 1 and the charging gun head 3 are connected by two metal contacts 2 to achieve power supply. The charging gun body 1 and the metal contacts 2 are provided with a disconnection mechanism that can cut off the power when exposed to high temperature. The disconnection mechanism is provided with a deformation mechanism for opening the disconnection mechanism.

[0019] like Figure 4 , Figure 5 , Figure 6As shown in Figure 10, the disconnection mechanism includes a fixed circular plate 12, which is fixedly mounted on the charging gun body 1. A rotating ring 13 is rotatably sleeved on the fixed circular plate 12. Four locking pins 14 are fixedly mounted at equal intervals on the side circumference of the rotating ring 13. The four locking pins 14 are all L-shaped. Since the rotating ring 13 can rotate on the fixed circular plate 12, and the locking pins 14 on the rotating ring 13 can be adjusted in position according to the rotation of the rotating ring 13, it is convenient for subsequent rotation operations.

[0020] A first fixing block 4 is fixedly installed on the charging gun head 3. Four spherical grooves 5 are equidistantly opened on the first fixing block 4. A metal ball 6 is placed in each spherical groove 5 of the first fixing block 4. Since the metal ball 6 is spherical, and most of the spherical area of ​​the metal ball 6 is within the spherical groove 5 of the first fixing block 4, the metal ball 6 will not be pulled out of the spherical groove 5 under normal pulling force. Therefore, when the car moves while charging and is subjected to strong pulling force, the metal ball 6 can be pulled out of the spherical groove 5. At this time, the charging gun head 3 and the charging gun body 1 are completely separated, thereby avoiding further damage to the charging pile 19.

[0021] A second fixing block 9 is fixedly installed on the charging gun body 1. Four pull rods 7 are slidably installed through the second fixing block 9. A sliding ring 10 is fixedly installed between the left ends of the four pull rods 7. Four rectangular through holes 11 are equidistantly opened on the circumference of the sliding ring 10. The four rectangular through holes 11 of the sliding ring 10 correspond to four locking pins 14 respectively. When the sliding ring 10 and the rotating ring 13 are in the installed closed state, the L-shaped edges of the four locking pins 14 will be locked into the four rectangular through holes 11 of the sliding ring 10, thereby completing the fixation of the sliding ring 10. The four pull rods 7 are fixedly installed on four metal balls 6 respectively. Springs 8 are sleeved on the surface of each of the four pull rods 7. The springs 8 are located between the second fixing block 9 and the first fixing block 4. When the sliding ring 10 and the rotating ring 13 are in the installed closed state, the four springs 8 are in the compressed state. Therefore, when the sliding ring 10 and the rotating ring 13 are separated, the charging gun head 3 can be separated from the charging gun body 1 under the elastic action of the four springs 8.

[0022] like Figure 7 , Figure 8 and Figure 9As shown, the deformation mechanism includes a heat-conducting ring 15, which is made of thermally conductive metal. The heat-conducting ring 15 is press-fitted into the inner wall of the charging gun body 1. Four second metal layers 17 are fixedly installed equidistantly on the circumferential surface of the heat-conducting ring 15. A first metal layer 16 is fixedly installed on the side end of each second metal layer 17. The first metal layer 16 is attached to the locking pin 14. Thermal grease is provided between the second metal layers 17 and the first metal layers 16 and the heat-conducting ring 15. Since the heat-conducting ring 15 is installed inside the charging gun body 1 and is made of thermally conductive metal, the average temperature inside the charging gun body 1 can be collected. When the internal temperature reaches a certain value (e.g., 65°C), because the second metal layers 17 and the first metal layers 16 are tightly bonded together by welding and lamination of two metal layers with significantly different coefficients of thermal expansion, the second metal layers 17 and the first metal layers 16 will be heated simultaneously as a whole when heated. The second metal layer 17, with a high coefficient of thermal expansion, will expand to a longer extent, while the first metal layer 16, with a low coefficient of thermal expansion, will expand to a shorter extent. Since the second metal layer 17 and the first metal layer 16 are tightly bonded together, they cannot expand freely on their own. Ultimately, they will bend towards the side of the first metal layer 16, which has a low coefficient of thermal expansion. This means that the second metal layer 17, which has a large expansion amount, is restricted and can only release its deformation by bending. When the first metal layer 16 and the second metal layer 17 bend due to expansion, they can drive the locking pin 14 to rotate. When the locking pin 14 rotates to completely coincide with the rectangular through hole 11 opened in the sliding ring 10, under the elastic force of the four springs 8, the charging gun head 3 and the charging gun body 1 are separated instantly, thereby completing the power-off. Furthermore, since the heat-conducting ring 15, the second metal layer 17, and the first metal layer 16 set in the charging gun body 1 are all made of heat-conducting materials, they can dissipate heat while the high-temperature warning power-off is in effect.

[0023] The triggering temperature of the second metal layer 17 and the first metal layer 16 is determined by the difference in thermal expansion coefficients and geometric dimensions of the two metal layers. Therefore, if triggering at 65°C is required, a combination of brass and nickel-iron alloy can be used. By adjusting the thickness ratio of the two metal layers (e.g., 0.2 mm for the brass layer and 0.3 mm for the nickel-iron layer), the bimetallic strip can generate sufficient bending (≥2 mm) at 65°C to drive the locking pin 14 to rotate. The second metal layer 17 and the first metal layer 16 are placed in a constant temperature environment of 25°C (simulating room temperature) to ensure that they are not bent. If there is a deviation, the fixing screw compensation piece is finely adjusted. The second metal layer 17 and the first metal layer 16 are placed in a constant temperature oil bath and heating table at 65°C. After holding at this temperature for 30 minutes, it is checked whether the bending amount can drive the locking plate to fully unlock. If the deviation is >2°C, the triggering temperature is corrected by changing the effective length of the second metal layer 17 and the first metal layer 16 (e.g., cutting the edge) or adjusting the position of the toggle block.

[0024] Within this device: Charging gun body 1: One of the core components of charging. Its end is connected to the charging pile 19 via the charging cable 20. Its side end is matched with the charging gun head 3. The inner wall is fitted with a heat-conducting ring 15. The surface is fixed with a second fixing block 9 and a fixing circular plate 12. The surface opposite to the charging gun head 3 is provided with metal contacts 2 for carrying current transmission and installing disconnection and deformation mechanisms.

[0025] Metal contacts 2: There are two sets, which are respectively located on the opposite sides of the charging gun body 1 and the charging gun head 3. When the two sets of contacts are in contact, current can be conducted. They are the key components for the charging gun body 1 to transmit electrical energy to the charging gun head 3, ensuring stable current transmission during the charging process.

[0026] Charging gun head 3: Used in conjunction with charging gun body 1, one end is used to connect to the charging interface of new energy vehicles, and the other end has a first fixing block 4 fixed on its surface, and a metal contact 2 is provided on the opposite side of the charging gun body 1. By docking and separating with the charging gun body 1, the charging can be controlled to start and stop.

[0027] First fixing block 4: It is fixedly installed on the side of the charging gun head 3 near the charging gun body 1. Four spherical grooves 5 are equidistantly opened around the circumference, which serve as the mounting carrier for the metal ball 6. The spherical grooves 5 restrict the normal displacement of the metal ball 6 and provide a support point for one end of the spring 8.

[0028] Spherical grooves 5: Four of them are formed on the first fixing block 4 and are equidistant from each other on the circumference. Metal balls 6 are placed in the grooves. Under normal conditions, the position of the metal balls 6 can be fixed. When subjected to a pulling force exceeding the threshold, the metal balls 6 are allowed to detach, realizing the emergency separation of the charging gun head 3 from the charging gun body 1.

[0029] Metal spheres 6: Four spheres are embedded in the spherical grooves 5. One end is fixedly connected to the pull rod 7. Under normal conditions, the spherical grooves 5 limit the connection to ensure stable docking between the charging gun body 1 and the charging gun head 3. When the external force exceeds the limit, the spheres can be dislodged from the spherical grooves 5 to trigger emergency disconnection.

[0030] Pull rod 7: There are four in total. They pass through the second fixed block 9 and can slide. The left end is fixed to the sliding ring 10 and the right end is fixed to the metal ball 6. They can transmit the displacement of the sliding ring 10 and the force on the metal ball 6, and at the same time provide a mounting carrier for the spring 8.

[0031] Spring 8: It is sleeved on the surface of the pull rod 7 and located between the second fixed block 9 and the first fixed block 4. During normal charging, it is in a compressed state (stores elastic potential energy). When the disconnection mechanism is unlocked, it releases potential energy to push the first fixed block 4 (and the charging gun head 3) to separate from the charging gun body 1.

[0032] The second fixing block 9 is fixedly installed on the side of the charging gun body 1 near the charging gun head 3. It has four through holes for the pull rod 7 to slide, serving as a sliding guide structure for the pull rod 7 and providing another support point for the spring 8, thus limiting the deformation direction of the spring 8.

[0033] Sliding ring 10: Fixed to the left end of the four pull rods 7, with four rectangular through holes 11 equidistant from each other around the circumference. It is locked by engaging the rectangular through holes 11 with the locking pin 14. When unlocking, it moves synchronously with the pull rods 7, causing the charging gun head 3 to disengage from the charging gun body 1.

[0034] Rectangular through holes 11: Four of them are formed on the sliding ring 10 and correspond one-to-one with the locking pins 14. Under normal conditions, the L-shaped locking pins 14 are inserted to fix the sliding ring 10. When the locking pins 14 rotate and coincide with the through holes, the sliding ring 10 can move freely.

[0035] Fixed circular plate 12: It is fixedly installed on the charging gun body 1 and located on the side of the sliding ring 10 away from the charging gun head 3. The outer ring is fitted with a rotating ring 13 to provide rotational support for the rotating ring 13 and limit the axial displacement of the rotating ring 13.

[0036] Rotating ring 13: Rotatably sleeved on fixed circular plate 12, with four locking pins 14 fixed at equal intervals on the side circumference. It can rotate around fixed circular plate 12. By rotating, the locking pins 14 are adjusted to achieve locking and unlocking of sliding ring 10.

[0037] Card pin 14: L-shaped structure, four in total, fixed to the side of rotating ring 13. Under normal conditions, it is inserted into rectangular through hole 11 to lock sliding ring 10. After being rotated by deformation mechanism, it is disengaged from through hole and unlocked and disconnected.

[0038] Thermal ring 15: Made of thermally conductive metal, it is fixed to the inner wall of the charging gun body 1 by interference fit. It can collect the average internal temperature of the charging gun body 1 in real time and transfer heat to the first metal layer 16 and the second metal layer 17 through thermal grease, while also serving as an auxiliary heat dissipation function.

[0039] First metal layer 16: A metal layer with a low coefficient of thermal expansion, there are four of them and they are fixed to the side of the second metal layer 17. They are attached to the locking pin 14. When heated, due to the difference in expansion between the first metal layer 16 and the second metal layer 17, the first metal layer 16 bends to one side along with the second metal layer 17, causing the locking pin 14 to rotate.

[0040] Second metal layer 17: A metal layer with a high coefficient of thermal expansion. There are four of them, which are fixed to the circumferential surface of the heat-conducting ring 15 and are closely attached to the first metal layer 16 (welding + lamination). When heated, the expansion amount is greater than that of the first metal layer 16, which pushes the bimetallic layer to bend. It is the core driving component of the deformation mechanism.

[0041] Working principle: Step 1: First, fix the charging pile 19 to the wall using a wall-mounted structure. Simultaneously, install hooks 21 at corresponding positions on the wall for placing the charging gun body 1 and charging head 3 when not in use, forming the basic installation layout. The charging gun body 1 is connected to the charging pile 19 via a charging cable 20, forming a complete charging assembly. At this time, the disconnecting mechanism is in a "closed pre-tightened" state: the fixed circular plate 12 is fixed to the charging gun body 1, and the rotating ring 13 is sleeved on the fixed circular plate 12 and can rotate freely. Four L-shaped locking pins 14 on its side end engage with the rectangular through holes 11 of the sliding ring 10, locking the sliding ring 10. The sliding ring 10 is fixedly connected to four pull rods 7, and the other end of each pull rod 7 is connected to a metal ball 6, which is embedded in the charging... The first fixing block 4 of the electric gun head 3 is in the spherical groove 5, and the spring 8 between the second fixing block 9 and the first fixing block 4 is in a compressed state, storing elastic potential energy for subsequent disconnection action. The deformation mechanism (heat-conducting ring 15, first metal layer 16, second metal layer 17) is in a standby state at room temperature: the heat-conducting ring 15 is fixed to the inner wall of the charging gun body 1 by interference fit, and can collect the average temperature inside the gun body in real time; the first metal layer 16 (low coefficient of thermal expansion) and the second metal layer 17 (high coefficient of thermal expansion) are tightly bonded by welding and lamination, and thermal grease is applied between the two and the heat-conducting ring 15 to enhance heat transfer. At room temperature, the bimetallic layer does not bend, and the first metal layer 16 remains in contact with the locking pin 14 and does not trigger rotation.

[0042] Step 2: When charging a new energy vehicle, remove the charging gun body 1 and charging gun head 3 from the hook 21. Manually push the charging gun head 3 towards the charging gun body 1 so that the metal contacts 2 on their opposite sides are fully engaged. After the metal contacts 2 make contact, the current is conducted from the charging pile 19 through the charging cable 20 to the charging gun body 1, and then through the metal contacts 2 to the charging gun head 3, ultimately inputting into the new energy vehicle battery to achieve stable charging. During this process, the locking pin 14 of the disconnecting mechanism always locks the rectangular through hole 11 of the sliding ring 10, and the spring 8 remains compressed, ensuring that the charging gun body 1 and the charging gun head 3 are firmly connected, preventing the contacts from disengaging due to slight vibrations during charging. Step 3: If a short circuit or overload occurs during charging, the internal temperature of the charging gun body 1 will rise. The heat-conducting ring 15 (made of heat-conducting metal) will quickly collect the temperature and transfer the heat to the first metal layer 16 and the second metal layer 17 through the thermal grease. When the temperature rises to a set threshold (e.g., 65°C), because the coefficient of thermal expansion of the second metal layer 17 is much higher than that of the first metal layer 16, the two will expand differentially after being heated: the second metal layer 17 needs to expand a longer length, while the first metal layer 16 expands less. Since the two metal layers are tightly bonded, they cannot expand independently, and eventually the whole thing bends towards the first metal layer 16 (bending amount ≥ 2mm). When the two metal layers bend, they drive the latches that are attached to them. Pin 14 rotates synchronously (rotating ring 13 rotates on fixed circular plate 12 along with locking pin 14). When locking pin 14 rotates to completely overlap with the rectangular through hole 11 of sliding ring 10, the locking state of sliding ring 10 is released. At this time, the compressed spring 8 instantly releases its elastic potential energy, pushing the first fixed block 4 (fixed to charging gun head 3) to move away from charging gun body 1. At the same time, the pull rod 7 drives sliding ring 10 to move synchronously, so that charging gun head 3 and charging gun body 1 are quickly separated, metal contact 2 is disengaged, and automatic power-off is achieved. Meanwhile, heat-conducting ring 15 and bimetallic layer continue to play a heat-conducting role, assisting the charging gun body 1 in heat dissipation and avoiding continuous damage to components due to high temperature. Step 4: If the new energy vehicle moves unexpectedly during charging, the resulting pulling force acts on the connection between the charging gun head 3 and the charging gun body 1. The metal sphere 6 is mostly embedded in the spherical groove 5 of the first fixing block 4, maintaining stability under normal slight pulling force. However, when the pulling force exceeds the safety threshold, the metal sphere 6 will detach from the spherical groove 5. After the metal sphere 6 detaches, the connection between the charging gun head 3 and the pull rod 7 fails. Under the combined action of the elasticity of the spring 8 and the pulling force, the charging gun head 3 and the charging gun body 1 quickly separate, the metal contact 2 disconnects, and charging is terminated. This design prevents the pulling force from being transmitted to the charging pile 19, preventing the charging pile 19 from becoming loose or damaged, or the charging cable 20 from breaking. Step 5: After charging stops (whether automatically or in an emergency), retrieve the charging gun body 1 and charging gun head 3 and temporarily store them at the hook 21. If charging is required again, manually push the charging gun head 3 towards the charging gun body 1 so that the metal ball 6 is re-embedded into the spherical groove 5. At the same time, push the sliding ring 10 to compress the spring 8 until the locking pin 14 on the rotating ring 13 re-engages into the rectangular through hole 11 of the sliding ring 10, thus completing the reset of the disconnection mechanism. If the disconnection was previously due to high temperature, wait for the internal temperature of the charging gun body 1 to drop to room temperature (e.g., 25°C), the first metal layer 16 and the second metal layer 17 to return to a flat state, and the locking pin 14 to return to the initial locking position. At this time, the metal contact 2 can be re-engaged and the charging gun enters the standby state.

[0043] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A wall-mounted waterproof charging gun for new energy vehicles, comprising a charging pile (19), wherein the lower end of the charging pile (19) is provided with a charging cable (20), and the end of the charging cable (20) is provided with a charging gun body (1). The charging pile (19) is wall-mounted on a wall, and a hook (21) is installed on the wall for placing the charging gun body (1) and the charging gun head (3). Its features are, The charging gun body (1) and the charging gun head (3) are provided with metal contacts (2) on their opposite sides. The charging gun body (1) and the charging gun head (3) are connected by two metal contacts (2) to achieve power supply. The charging gun body (1) and the metal contacts (2) are provided with disconnection mechanisms. The disconnection mechanism is provided with a deformation mechanism for opening the disconnection mechanism.

2. The wall-mounted waterproof charging gun for new energy vehicles as described in claim 1, characterized in that, The disconnection mechanism includes a fixed circular plate (12), which is fixedly installed on the charging gun body (1), and a rotating ring (13) is rotatably sleeved on the fixed circular plate (12).

3. The wall-mounted waterproof charging gun for new energy vehicles as described in claim 2, characterized in that, The rotating ring (13) has four locking pins (14) fixedly installed at equal intervals on its side circumference, and the four locking pins (14) are all L-shaped.

4. The wall-mounted waterproof charging gun for new energy vehicles as described in claim 3, characterized in that, A first fixing block (4) is fixedly installed on the charging gun head (3). Four spherical grooves (5) are equidistantly opened on the first fixing block (4). Each spherical groove (5) opened on the first fixing block (4) contains a metal ball (6).

5. A wall-mounted waterproof charging gun for new energy vehicles as described in claim 4, characterized in that, A second fixing block (9) is fixedly installed on the charging gun body (1), and four pull rods (7) are slidably installed through the second fixing block (9).

6. The wall-mounted waterproof charging gun for new energy vehicles as described in claim 5, characterized in that, A sliding ring (10) is fixedly installed between the left ends of the four pull rods (7). The sliding ring (10) has four rectangular through holes (11) equidistant from each other on its circumference. The four rectangular through holes (11) of the sliding ring (10) correspond to the four locking pins (14) respectively.

7. A wall-mounted waterproof charging gun for new energy vehicles as described in claim 6, characterized in that, The four pull rods (7) are respectively fixedly installed on the four metal spheres (6), and springs (8) are sleeved on the surface of the four pull rods (7). The springs (8) are located between the second fixing block (9) and the first fixing block (4).

8. The wall-mounted waterproof charging gun for new energy vehicles as described in claim 7, characterized in that, The deformation mechanism includes a heat-conducting ring (15), which is press-fitted into the inner wall of the charging gun body (1).

9. A wall-mounted waterproof charging gun for new energy vehicles as described in claim 8, characterized in that, The heat-conducting ring (15) has four second metal layers (17) fixedly installed at equal intervals around its circumference, and a first metal layer (16) is fixedly installed on the side end of each second metal layer (17).

10. A wall-mounted waterproof charging gun for new energy vehicles as described in claim 9, characterized in that, The first metal layer (16) is attached to the card pin (14), and thermal grease is provided between the second metal layer (17) and the first metal layer (16) and the thermal ring (15).

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