Heat dissipation type vehicle-mounted charger with multiple safety protection

Abstract

The invention discloses a heat dissipation type vehicle-mounted charger with multiple safety protection. The heat dissipation type vehicle-mounted charger comprises an outer shell, a chip, a spring contact, a supporting block, an adjusting mechanism, a positioning mechanism and a heat dissipation mechanism. The chip performs electric energy conversion, regulation and control; the spring contact is in circuit connection with the chip through a spring; the two supporting blocks are distributed on the outer wall of the insertion end of the outer shell and can get away from and get close to the center of the outer shell. The adjusting mechanism comprises an adjusting ring, the bottom of the adjusting ring protrudes downwards to form a limiting ring, and the limiting ring is designed to be different in thickness. The adjustable supporting block adapts to different cigarette lighter connector inner diameters, and stable fixing is achieved; the positioning mechanism controls meshing of tooth claws and annular tooth grooves through buttons, and mistaken rotation is prevented; the heat dissipation mechanism comprises a plurality of heat dissipation through holes, opening and closing of the through holes can be achieved by rotating an adjusting ring, the heat dissipation effect is guaranteed, and dust is prevented from entering. The cigarette lighter connector has multiple safety protection functions, and is reasonable in structure, efficient in heat dissipation, stable in fixation and suitable for cigarette lighter connectors of various vehicle types.

Description

Technical Field

[0001] This invention belongs to the field of automotive charging accessory technology, specifically relating to a heat-dissipating onboard charger with multiple safety protections. Background Technology

[0002] A car charger is an electronic device that draws power from the car's cigarette lighter socket or 12V power outlet, converting the car battery's 12V DC power into a 5V DC power output using a USB standard voltage to charge devices such as mobile phones, tablets, and navigation systems. Car chargers require safety features, such as short-circuit protection, overcurrent protection, and overvoltage protection for the internal chips—these are mature technologies. Additionally, the casing is typically made of flame-retardant materials or a metal shell to further enhance safety.

[0003] Car charger plugs are often smaller than the inner diameter of the cigarette lighter socket to accommodate different car models. However, since cigarette lighter sockets vary in size, this can lead to loosening. To address this issue, two design solutions are generally used: 1. Side wall springs: Multiple curved metal springs are designed on the side wall of the cylindrical body of the car charger. These springs are slightly convex outward in their natural state. When the car charger is inserted into the cigarette lighter socket, the inner wall of the socket will squeeze these springs, causing them to contract inward. After the springs are compressed, they will generate a continuous and strong outward expansion force. This force will press against the inner wall of the cigarette lighter socket, generating static friction, thus enabling the car charger to adapt to various cigarette lighter sockets, such as the patented fast heat dissipation and cooling car charger (CN216290276U).

[0004] 2. The design of the spring pin: There are multiple metal pins with springs on the side wall of the cylindrical body of the car charger. The function of this pin is to press firmly against the inner wall of the cigarette lighter interface. The spring pin provides an outward pressure to realize the positioning of the car charger to adapt to various cigarette lighter interfaces, such as the patented car charger connector plug (CN118336453B).

[0005] However, the above-mentioned fixing methods are difficult to achieve a stable fixing effect. After frequent plugging and unplugging, the elastic compression effect will weaken. Especially when the vehicle is moving, vibration and bumps can easily cause the car charger to loosen and rotate in the cigarette lighter interface. This will directly affect the charging stability. More seriously, poor contact will generate electric sparks and local high temperatures, which are potential safety hazards.

[0006] On the other hand, to improve durability and safety, vehicle chargers are generally designed for heat dissipation. Currently, some designs incorporate their own casing, such as an overall aluminum alloy thermal conductive material, but this can lead to high overall temperatures for the vehicle charger, causing overheating or abnormally hot contact with the user. Other designs use heat dissipation holes, such as the vehicle charger with heat dissipation function (CN118399118B), but dust can enter the vehicle charger through the heat dissipation holes, affecting heat dissipation and normal use.

[0007] Therefore, it is necessary to design a heat-dissipating vehicle charger with multiple safety protections to solve the above problems. Summary of the Invention

[0008] This invention provides a multi-layered, heat-dissipating car charger with adjustable support blocks to adapt to different cigarette lighter interface inner diameters for stable fixation; a positioning mechanism controls the engagement of the toothed claw with the annular toothed groove via a button to prevent accidental rotation; and a heat dissipation mechanism includes multiple heat dissipation through holes, which can be opened and closed by rotating the adjustment ring, ensuring both heat dissipation and preventing dust from entering, thus solving the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a heat-dissipating vehicle charger with multiple safety protections, including a housing, the housing being an overall cylindrical structure; A chip, installed inside a casing, performs electrical energy conversion and regulation. The chip is positioned and mounted in the housing by a fixing module, with at least upper and lower fixing modules for overall chip positioning; a USB interface is provided on the upper fixing module; The spring contact is located at the center of the bottom of the housing and presses firmly against the electrode contact at the bottom of the cigarette lighter interface. The spring contact is connected to the chip circuit through the spring. Support blocks, two support blocks are distributed on the outer wall of the insertion end of the outer shell, and the outer shell is provided with receiving grooves for the support blocks to move away from or closer to the center of the outer shell; The adjustment mechanism includes an adjustment ring fitted on the outer wall of the outer shell. The bottom of the adjustment ring protrudes downwards and has a limit ring. The limit ring is designed with different thicknesses, gradually increasing in thickness from the middle to both ends. The top of the support block is equipped with a limiting head, which forms a limiting groove facing inward. The limiting ring can be fitted into the limiting groove. In this way, by rotating the adjusting ring and further by the limiting ring of different thickness against the inner wall of the limiting head, the support block can be adjusted outward.

[0010] Preferably, it also includes a positioning mechanism for positioning after the adjustment ring is rotated and adjusted. The positioning mechanism includes a round cover fitted on the top of the outer shell, the inner side of the top of the round cover abutting against the upper fixing module of the chip, and a through hole provided at the center of the top of the round cover; the bottom end of the round cover is fixedly connected to the adjustment ring. The positioning mechanism also includes a positioning ring disposed on the outer wall of the outer shell. The outer edge of the positioning ring is provided with an annular ring, and the inner side of the annular ring forms an annular tooth groove. There is a gap between the outer wall of the outer shell and the inner wall of the round cover. The outer shell is provided with a convex ring that abuts against the inner wall of the round cover. The positioning ring is located in the cavity formed between the upper and lower convex rings, the outer shell and the round cover. The outer wall of the positioning ring does not contact the inner wall of the round cover. The convex ring is used for the upper and lower limit of the round cover. A button is provided on the round cover. The button includes a button handle that passes through the round cover. The diameter of the button head is larger than the diameter of the button handle. The outer wall of the round cover is provided with a groove for the button head to be received. A strong compression spring is fitted on the outer wall of the button handle and located in the groove. The end of the button handle located inside the round cover is provided with a toothed claw that engages with the annular toothed groove. During this process, the strong compression spring presses the button head outward to make the toothed claw engage with the annular toothed groove. The strong compression prevents the round cover from rotating relative to the outer shell. Both the positioning ring and the button are made of high-hardness wear-resistant alloy material.

[0011] Preferably, the outer wall of the round cover and the adjusting ring are fixedly connected by a locking mechanism; the round cover is made of high hardness and wear-resistant material, and the adjusting ring is made of high hardness and wear-resistant alloy; multiple positioning holes are evenly distributed on the outer edge of the adjusting ring, and a positioning outer hole corresponding to the positioning hole is provided on the inner wall of the bottom end of the round cover. A compression spring and a positioning pin are installed in the positioning hole, and the positioning pin is locked between the positioning hole and the positioning outer hole under the compression of the compression spring.

[0012] Preferably, the round cover is made of high-hardness, wear-resistant PPSU plastic; the outer shell is made of aluminum alloy.

[0013] Preferably, a heat dissipation mechanism is also provided between the round cover and the outer shell; it includes a first heat dissipation through hole connecting the inside and outside of the outer shell, and multiple first heat dissipation through holes are arranged circumferentially at intervals. The lower convex ring and adjustment ring of the outer shell are also provided with corresponding second and third heat dissipation through holes. When the second and third heat dissipation through holes intersect, the inside and outside of the outer shell are connected to the external airflow through the heat dissipation through holes.

[0014] Preferably, the heat dissipation holes of the adjusting ring are evenly spaced around the center of the adjusting ring; the heat dissipation holes on the lower convex ring are also evenly spaced in the same number, and the gap length between the heat dissipation holes on the lower convex ring can completely block the heat dissipation holes on the adjusting ring.

[0015] Preferably, a tension spring is provided on the inner side of the support block, and the support block is provided with a groove for connecting the end of the tension spring and is welded and fixed. The other end of the tension spring is welded and fixed to the inner wall of the receiving groove. The depth of the receiving groove is greater than the maximum thickness of the limiting ring.

[0016] Preferably, a heat dissipation channel is provided inside the support block, with one end of the heat dissipation channel penetrating the inner side of the support block and the other end penetrating the lower end of the support block, and a fourth heat dissipation hole is provided in the outer shell, penetrating the interior and the receiving groove.

[0017] Preferably, when the support block retracts inward to the minimum circular radius, the lower end of the heat dissipation channel is completely located within the receiving groove and is blocked.

[0018] Preferably, a fixed long groove is provided on the outside of the support block, and an anti-slip silicone strip is fixedly installed in the fixed long groove. The anti-slip silicone strip is made of high temperature resistant silicone material and is inserted into the fixed long groove of the support block. The fixed long groove has a structure that is larger inside and smaller at the opening, that is, it gradually narrows from the inside to the outside.

[0019] Compared with the prior art, the beneficial effects of the present invention are: 1. The adjustable support block provides stable support against the inner wall of the cigarette lighter socket, which can accommodate different sizes of cigarette lighter sockets. At the same time, it will not cause the car charger to loosen or rotate in the cigarette lighter interface during vehicle vibration and bumps, ensuring stable and safe charging.

[0020] 2. The toothed pawl engagement mechanism, controlled by a button, prevents the adjusting ring from rotating accidentally, ensuring stability during use.

[0021] 3. The outer shell is made of aluminum alloy, and the round cover is made of wear-resistant and heat-insulating plastic, which ensures heat dissipation and prevents scalding.

[0022] 4. The heat dissipation vents can be opened or closed, ensuring efficient heat dissipation while preventing dust from entering the interior and extending service life.

[0023] 5. The support block has a built-in heat dissipation channel to enhance heat dissipation, especially for heat sources such as chips and spring contacts. The heat dissipation channel can be opened or closed to ensure efficient heat dissipation and prevent dust from entering the interior, thus extending the service life.

[0024] 6. The adjustable support block and anti-slip silicone strip design ensure a tight fit with the cigarette lighter interface, preventing loosening and rotation, improving stability and safety, and providing multiple electrical protection functions for safety and reliability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the front cross-sectional structure of the present invention; Figure 2 This is a top view of the structure of the present invention; Figure 3 This is a bottom view of the adjustment ring and limiting ring structure of the present invention; Figure 4 for Figure 1 A magnified structural diagram at point A; Figure 5 This is a schematic diagram of the annular toothed groove and toothed claw meshing structure of the present invention; Figure 6 for Figure 1 A magnified structural diagram at point B; Figure 7This is a schematic diagram of the convex ring and the second heat dissipation through hole structure of the present invention; Figure 8 This is a side view of the structure of the present invention; Figure 9 This is a side view of the support block structure of the present invention.

[0026] In the diagram: 1. Outer shell; 2. Chip; 201. Fixing module; 202. USB interface; 3. Spring contact; 4. Support block; 401. Receiving groove; 402. Limiting head; 403. Tension spring; 404. Heat dissipation channel; 405. Fourth heat dissipation hole; 5. Adjustment ring; 501. Limiting ring; 502. Positioning hole; 503. Compression spring; 504. Positioning post; 505. Small hole; 6. Round cover; 7. Positioning ring; 701. Annular ring; 702. Annular toothed groove; 703. Convex ring; 8. Button; 801. Button handle; 802. Strong compression spring; 803. Toothed claw; 9. First heat dissipation through hole; 10. Second heat dissipation through hole; 11. Third heat dissipation through hole; 12. Anti-slip silicone strip. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1-3 This invention provides a heat-dissipating car charger with multiple safety protections, including a housing 1. The housing 1 has an overall cylindrical structure, which is compatible with most cigarette lighter round sockets on the market. Its head diameter is larger than its bottom diameter, which facilitates the design of interface space for connecting multiple USB connectors of charging devices.

[0029] Chip 2, installed inside housing 1, performs power conversion and regulation. It is designed with overvoltage protection to prevent the car charger from outputting excessive voltage and burning out the charging equipment; overcurrent protection to prevent the output current from being too large and exceeding the capacity of the equipment and cables; and short circuit protection to immediately cut off the power when a short circuit occurs at the output terminal to prevent the fuse from burning out or causing danger. Chip 2 is positioned and installed inside the housing 1 by fixing module 201. At least upper and lower fixing modules 201 are provided for overall positioning of chip 2. The shape of the fixing module 201 is designed according to the requirements, as long as it can achieve the positioning of chip 2 inside the housing 1. The material is high temperature resistant plastic. In this embodiment, the lower fixing module 201 is limited by the lower part of the gradually shrinking inner wall of the housing 1, while the upper fixing module 201 is positioned above the subsequently installed round cover. A USB interface 202 is provided on the upper fixing module 201 for connecting the USB connector of an external charging device.

[0030] Spring contact 3 is installed at the bottom center of housing 1, tightly pressing against the electrode contact at the bottom of cigarette lighter interface. Spring contact 3 is connected to the circuit of chip 2 through spring. Through its stretchable and pressure-bearing characteristics, it adapts to the cigarette lighter interface of various car models, maintaining a tight, stable, and uninterrupted electrical connection, and providing a reliable return path for current.

[0031] Support blocks 4 are distributed on the outer wall of the insertion end of the outer shell 1. In this embodiment, two support blocks 4 are set on both sides. The outer shell 1 is provided with a receiving groove 401 corresponding to the support block 4. The receiving groove 401 is used to move the support block 4 away from or closer to the center of the outer shell 1, so as to realize the expansion and contraction adjustment of the diameter of the circle where the outer wall of the support block 4 is located, thereby making adaptive expansion and contraction adjustment to provide stable support according to different inner diameters of the cigarette lighter socket.

[0032] The adjustment mechanism is used to control the support block 4 to move away from and closer to the center of the outer shell 1. It includes an adjustment ring 5 fitted on the outer wall of the outer shell 1. The bottom of the adjustment ring 5 protrudes downwards and a limit ring 501 is provided. The limit ring 501 is designed with different thicknesses. The limit ring 501 gradually thickens from the middle position to both ends and has a hollow shuttle-shaped structure in the middle. The top of the support block 4 is provided with a limiting head 402, which forms a limiting groove facing inward. The limiting ring 501 can be fitted into the limiting groove. By rotating the adjusting ring 5 and further by the limiting ring 501 pressing against the inner wall of the limiting head 402 with different thicknesses, the support block 4 can be adjusted outward. Thus, it can first enter the cigarette lighter socket with a small diameter, and then after rotation and adjustment, the support block 4 can be pressed against the inner wall of the cigarette lighter socket for stable support.

[0033] Please see Figure 1 , Figure 4 , Figure 5 As a further embodiment, it also includes a positioning mechanism for positioning the adjustment ring 5 after rotation adjustment. The positioning mechanism includes a round cover 6 fitted on the top of the outer shell 1. The inner side of the top of the round cover 6 abuts against the upper fixing module 201 of the chip 2. A through hole is provided at the center of the top of the round cover 6, which exposes the USB interface 202 of the fixing module 201 without interfering with its use. The bottom of the round cover 6 is fixedly connected to the adjusting ring 5, so that rotating the round cover 6 can further complete the rotation adjustment of the adjusting ring 5. Marks are set on the round cover 6 so that the rotation position of the round cover 6 can be determined. This is a conventional design and will not be described in the accompanying drawings. The positioning mechanism also includes a positioning ring 7 disposed on the outer wall of the outer shell 1. An annular ring 701 is disposed downward on the outer edge of the positioning ring 7. An annular tooth groove 702 is formed on the inner side of the annular ring 701. There is a gap between the outer wall of the outer shell 1 and the inner wall of the round cover 6. The outer shell 1 is provided with a protruding ring 703 that abuts against the inner wall of the round cover 6. The positioning ring 7 is located in the cavity formed between the upper and lower protruding rings 703, the outer shell 1 and the round cover 6. The outer wall of the positioning ring 7 does not contact the inner wall of the round cover 6. The protruding ring 703 is used for upper and lower limit of the round cover 6. A button 8 is provided on the round cover 6. The button 8 includes a button handle 801 that passes through the round cover. The diameter of the button head is larger than the diameter of the button handle 801. The outer wall of the round cover 6 is provided with a groove for the button head to be received. A strong compression spring 802 is sleeved on the outer wall of the button handle 801 and located in the groove. The end of the button handle 801 located inside the round cover 6 is provided with a toothed claw 803 that meshes with the annular toothed groove 702. During this process, the strong compression spring 802 presses the button head outward to make the toothed claw 803 mesh with the annular toothed groove 702. The strong compression prevents the round cover 6 from rotating relative to the outer shell 1. When it is necessary to rotate the round cover 6, the button 8 is pressed forcefully to make the toothed claw 803 fully disengage from the annular toothed groove 702. After releasing, the toothed claw 803 falls back into the annular toothed groove 702 to mesh, similar to the structure of a planetary gear. Both the positioning ring 7 and the button 8 are made of high-hardness wear-resistant alloy material, which maintains stability after long-term use.

[0034] Please see Figure 6 As a further embodiment, the round cover 6 and the outer wall of the adjusting ring 5 are fixedly connected by a locking mechanism, which ensures the stability of the connection between the round cover 6 and the adjusting ring 5, and further realizes the upper and lower limit of the round cover 6 on the outer shell 1 through the adjusting ring 5. The round cover 6 is made of high-hardness wear-resistant material, and the adjusting ring 5 is made of high-hardness wear-resistant alloy; Multiple positioning holes 502 are evenly distributed on the outer edge of the adjusting ring 5. The inner wall of the bottom end of the round cover 6 is provided with positioning outer holes corresponding to the positioning holes 502. The positioning holes 502 are equipped with compression springs 503 and positioning pins 504. The positioning pins 504 are locked between the positioning holes 502 and the positioning outer holes under the compression of the compression springs 503. The chamfered head of the positioning pins 504 facilitates entry into the positioning outer holes. Furthermore, in order to facilitate unlocking, the outer wall of the positioning outer holes is also provided with small holes 505, which can be used to push the positioning pins 504 completely back into the positioning holes 502 through the pin-shaped component to achieve unlocking. This ensures the stability of the connection between the round cover 6 and the adjusting ring 5.

[0035] As a further embodiment, the round cover 6 is made of a high-hardness, wear-resistant plastic material, such as PPSU, which has the characteristics of high temperature resistance, high durability and impact resistance. Meanwhile, plastic has a low thermal conductivity, which can prevent overheating and burning your hands; The outer casing 1 is made of aluminum alloy, which ensures that the overall heat dissipation is still good.

[0036] Please see Figure 1 , Figure 6 As a further embodiment, in order to enhance the heat dissipation effect, a heat dissipation mechanism is also provided between the round cover 6 and the outer shell 1; It includes a first heat dissipation hole 9 connecting the inside and outside of the outer shell 1. Multiple first heat dissipation holes 9 are arranged circumferentially. The lower convex ring 703 and the adjustment ring 5 of the outer shell 1 are also provided with corresponding second heat dissipation holes 10 and third heat dissipation holes 11. When the second heat dissipation hole 10 and the third heat dissipation hole 11 intersect, the inside and outside of the outer shell 1 are connected to the external airflow through the heat dissipation holes, so that the external airflow can quickly remove the heat inside the outer shell 1 through the heat dissipation holes. With the thermally conductive material of aluminum alloy, efficient heat dissipation is achieved.

[0037] Please see Figure 1 , Figure 3 , Figure 6 , Figure 7 As a further embodiment, considering that dust can easily enter the heat dissipation vents when not in use, causing dust to accumulate quickly inside the housing 1, the heat dissipation vents can be sealed when not in use. Specifically, the heat dissipation holes of the adjusting ring 5 are evenly spaced around the center of the adjusting ring; the heat dissipation holes on the lower convex ring 703 are also evenly spaced in the same number, and the gap between the heat dissipation holes on the lower convex ring 703 can completely block the heat dissipation holes on the adjusting ring 5. That is, when the adjusting ring 5 is rotated until the heat dissipation holes are completely blocked by the gap of the lower convex ring 703, the heat dissipation holes are completely sealed, so that dust cannot enter when not in use.

[0038] Please see Figure 1 As a further embodiment, a tension spring 403 is provided on the inner side of the support block 4, preferably two at the top and bottom. The support block 4 is provided with a groove for connecting the end of the tension spring 403 and is welded and fixed. The other end of the tension spring 403 is welded and fixed to the inner wall of the receiving groove. In this way, the tension of the tension spring 403 ensures that the inner wall of the limiting head 402 of the support block 4 is always in close contact with the outer wall of the limiting ring 501 when the adjusting ring 5 is rotated and adjusted. The depth of the receiving groove 401 is greater than the maximum thickness of the limiting ring 501, so that when the adjusting ring 5 is rotated for adjustment, the support block 4 will never leave the receiving groove 401, thus ensuring stability during the adjustment process.

[0039] Please see Figure 1As a further embodiment, a heat dissipation channel 404 is provided inside the support block 4. One end of the heat dissipation channel 404 extends through the inner side of the support block 4, and the other end extends through the lower end of the support block 4. The outer shell 1 is provided with a fourth heat dissipation hole 405 that extends through the interior and the receiving groove 401. The fourth heat dissipation hole 405 and the heat dissipation channel 404 form another channel that extends through the inside and outside of the outer shell 1, so that the external air exchanges heat with the internal heat sources, especially the spring contact 3 and the chip 2, and dissipates heat quickly.

[0040] As a further embodiment, when the support block 4 retracts inward to the minimum radius of the circle, the lower end of the heat dissipation channel 404 is completely located in the receiving groove and is blocked. In this way, when not in use, the heat dissipation channel is closed and dust cannot enter.

[0041] Please see Figure 8 , Figure 9 As a further embodiment, a fixed elongated groove is provided on the outside of the support block 4, and an anti-slip silicone strip 12 is fixedly installed in the fixed elongated groove. The anti-slip silicone strip 12 is made of high-temperature resistant silicone and is inserted into the fixed elongated groove of the support block 4. The fixed elongated groove has a structure that is wider at the inside and narrower at the outside, that is, it gradually narrows from the inside to the outside. In this way, the anti-slip silicone strip 12 will not fall off when it is inserted into the groove. At the same time, the outer end of the anti-slip silicone strip 12 protrudes from the fixed elongated groove. In this way, when the support block 4 is adjusted outward, the anti-slip silicone strip 12 provides a better anti-slip effect when it comes into contact with the cigarette lighter socket. At the same time, the anti-slip silicone strip 12 can be slightly elastically compressed after being squeezed, which can make up for the small gaps in the rotation adjustment of the support block 4. For example, when the toothed claw 803 meshes with the annular toothed groove 702, there will still be a small adjustment gap between the adjacent teeth, which cannot achieve stepless adjustment. The anti-slip silicone strip 12 can fully make up for this gap and achieve stepless adjustment, realize the stable and safe control of the support block 4, and at the same time avoid scratching the cigarette lighter socket.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heat-dissipating vehicle charger with multiple safety protections, comprising a housing (1), characterized in that, The outer shell (1) is a cylindrical structure as a whole; Chip (2) is installed inside the outer casing (1) to perform electrical energy conversion and regulation; The chip (2) is positioned and installed inside the outer shell (1) by the fixing module (201). At least the upper and lower fixing modules (201) are set to position the chip (2) as a whole; a USB interface (202) is set on the upper fixing module (201). The spring contact (3) is installed at the bottom center of the outer casing (1) and presses tightly against the electrode contact at the bottom of the cigarette lighter interface. The spring contact (3) is connected to the chip (2) circuit through the spring. Support blocks (4), two support blocks (4) are distributed on the outer wall of the insertion end of the outer shell (1), and the outer shell (1) is provided with a receiving groove (401) corresponding to the support block (4). The receiving groove (401) is used for the support block (4) to move away from and closer to the center of the outer shell (1); The adjustment mechanism includes an adjustment ring (5) fitted on the outer wall of the outer shell (1). The bottom of the adjustment ring (5) protrudes downwards and a limiting ring (501) is provided. The limiting ring (501) is designed with different thicknesses and gradually thickens from the middle position to both ends. The support block (4) is provided with a limiting head (402) at the top, forming a limiting groove facing inward. The limiting ring (501) can be fitted into the limiting groove. In this way, by rotating the adjusting ring (5) and further by the limiting ring (501) abutting against the inner wall of the limiting head (402) with different thicknesses, the support block (4) can be adjusted outward.

2. The heat-dissipating vehicle charger with multiple safety protections according to claim 1, characterized in that, It also includes a positioning mechanism, which is used for positioning the adjustment ring (5) after rotation adjustment. It includes a round cover (6) fitted on the top of the outer shell (1). The inner side of the top of the round cover (6) abuts against the upper fixing module (201) of the chip (2). A through hole is provided at the center of the top of the round cover (6). The bottom end of the round cover (6) is fixedly connected to the adjustment ring (5). The positioning mechanism also includes a positioning ring (7) disposed on the outer wall of the outer shell (1). An annular ring (701) is disposed on the outer edge of the positioning ring (7). An annular tooth groove (702) is formed on the inner side of the annular ring (701). There is a gap between the outer wall of the outer shell (1) and the inner wall of the round cover (6). The outer shell (1) is provided with a protrusion (703) that abuts against the inner wall of the round cover (6). The positioning ring (7) is located in the cavity formed between the upper and lower protrusions (703), the outer shell (1) and the round cover (6). The outer wall of the positioning ring (7) does not contact the inner wall of the round cover (6). The protrusion (703) is used for the upper and lower limit of the round cover (6). A button (8) is provided on the round cover (6). The button (8) includes a button handle (801) that passes through the round cover. The diameter of the head end of the button (8) is larger than the diameter of the button handle (801). The outer wall of the round cover (6) is provided with a groove for the head end of the button to be accommodated. The outer wall of the button handle (801) is fitted with a strong compression spring (802) located in the groove. The end of the button handle (801) located inside the round cover (6) is provided with a toothed claw (803) that meshes with the annular toothed groove (702). During this period, the strong compression spring (802) presses the head end of the button outward so that the toothed claw (803) meshes with the annular toothed groove (702). The strong compression prevents the round cover (6) from rotating relative to the outer shell (1). The positioning ring (7) and the button (8) are both made of high hardness wear-resistant alloy material.

3. A heat-dissipating vehicle charger with multiple safety protections according to claim 2, characterized in that, The outer wall of the round cover (6) and the adjusting ring (5) are fixedly connected by a locking mechanism; the round cover (6) is made of high hardness and wear-resistant material, and the adjusting ring (5) is made of high hardness and wear-resistant alloy; multiple positioning holes (502) are evenly distributed on the outer edge of the adjusting ring (5), and the inner wall of the bottom end of the round cover (6) is provided with positioning outer holes corresponding to the positioning holes (502). The positioning holes (502) are filled with compression springs (503) and positioning pins (504). The positioning pins (504) are locked between the positioning holes (502) and the positioning outer holes under the compression of the compression springs (503).

4. A heat-dissipating vehicle charger with multiple safety protections according to claim 2, characterized in that, The round cover (6) is made of high-hardness wear-resistant PPSU plastic; the outer shell (1) is made of aluminum alloy.

5. A heat-dissipating vehicle charger with multiple safety protections according to claim 2, characterized in that, A heat dissipation mechanism is also provided between the round cover (6) and the outer shell (1); it includes a first heat dissipation through hole (9) connecting the inside and outside of the outer shell (1), and multiple first heat dissipation through holes (9) are arranged circumferentially. The lower convex ring (703) and the adjustment ring (5) of the outer shell (1) are also provided with corresponding second heat dissipation through holes (10) and third heat dissipation through holes (11). When the second heat dissipation through hole (10) and the third heat dissipation through hole (11) intersect, the inside and outside of the outer shell (1) are connected to the external airflow through the heat dissipation through hole.

6. A heat-dissipating vehicle charger with multiple safety protections according to claim 5, characterized in that, The heat dissipation holes of the adjustment ring (5) are evenly spaced around the center of the adjustment ring; the heat dissipation holes on the lower convex ring (703) are also evenly spaced in the same number, and the gap length between the heat dissipation holes on the lower convex ring (703) can completely block the heat dissipation holes on the adjustment ring (5).

7. A heat-dissipating vehicle charger with multiple safety protections according to claim 1, characterized in that, A tension spring (403) is provided on the inner side of the support block (4). The support block (4) is provided with a groove for connecting the end of the tension spring (403) and is welded and fixed. The other end of the tension spring (403) is welded and fixed to the inner wall of the receiving groove (401). The depth of the receiving groove (401) is greater than the maximum thickness of the limiting ring (501).

8. A heat-dissipating vehicle charger with multiple safety protections according to claim 7, characterized in that, A heat dissipation channel (404) is provided inside the support block (4). One end of the heat dissipation channel (404) passes through the inside of the support block (4) and the other end passes through the lower end of the support block (4). The outer shell (1) is provided with a fourth heat dissipation hole (405) that passes through the interior and the receiving groove (401).

9. A heat-dissipating vehicle charger with multiple safety protections according to claim 8, characterized in that, When the support block (4) retracts inward to the minimum radius of the circle, the lower end of the heat dissipation channel (404) is completely located in the receiving groove and is blocked.

10. A heat-dissipating vehicle charger with multiple safety protections according to claim 1, characterized in that, The support block (4) has a fixed long groove on the outside, and an anti-slip silicone strip (12) is fixedly installed in the fixed long groove. The anti-slip silicone strip (12) is made of high temperature resistant silicone material and is inserted into the fixed long groove of the support block (4). The fixed long groove has a structure with a large inner opening and a small outer opening.

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