Power adapter with external heat dissipation device

Abstract

The utility model discloses a power adapter with an external heat dissipation device, and relates to the technical field of power adapters. The power adapter with the external heat dissipation device comprises a main body, the outer surface of the main body is sleeved with a heat dissipation cover, the outer surface of the main body is sleeved with a protective cover, the outer surface of the main body is sleeved with a rubber sleeve, the top of the protective cover is provided with a top plate, and the top plate is provided with an insertion groove matched with the main body. The side, away from the displacement rod, of the fixing block is attached to one side of the communicating groove, at the moment, a second spring enables the distance, located on the top of the fixing block, of the sliding rod to be long, meanwhile, two limiting blocks extend into second limiting grooves, away from the displacement rod, in the second fixing plate on the same side, and the fixing block cannot drive the second sliding rod to move towards the displacement rod. Through the mode, the top plate can be mounted and dismounted by controlling the sliding rod and the fixed block, so that the dismounting convenience of the mechanism is improved as much as possible, and the practicability of the device is improved as much as possible.

Description

Technical Field

[0001] The utility model relates to the technical field of power adapters, in particular to a power adapter with an external heat dissipation device. Background Art

[0002] A power adapter is a power supply conversion device for small portable electronic devices and electronic appliances. It is generally composed of a housing, transformer, inductor, capacitor, control IC, PCB board and other components. Its working principle is to convert AC input into DC output. It can be divided into wall-mounted and desktop types according to the connection method. It is widely used in security cameras, set-top boxes, routers, light bars, massagers and other equipment.

[0003] For example, a Chinese utility model patent for a power adapter with an external heat dissipation device, with publication number: CN216356494U, includes a power adapter main body, a heat dissipation cover is provided on the outside of the power adapter main body, a protective cover is provided on the outside of the heat dissipation cover, a top plate is provided on the top of the power adapter main body, and a rubber sleeve is provided between the heat dissipation cover and the protective cover and near the bottom. Although the above technology solves the problem that the heat can be guided on the outside of the power adapter main body by providing the heat dissipation cover and the top plate, and the heat is quickly dissipated through the heat sink and the heat dissipation ribs, thereby avoiding the problem of heat accumulation inside the power adapter causing the electronic components to burn out, it still exists in the actual use process. When the top plate is installed, the top plate is limited by the card block and the matching card slot. However, when it needs to be disassembled, since the length of the top plate is fixed and the shape of the heat dissipation cover is also fixed, it is relatively inconvenient to disassemble the top plate, which reduces the practicality of the device and increases the work intensity of disassembly as much as possible. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art and to provide a power adapter with an external heat dissipation device, which can solve the problem that, when the top plate is installed, the top plate is limited by the card block and the matching card slot, but when it needs to be disassembled, the length of the top plate is fixed and the shape of the heat dissipation cover is also fixed, so it is inconvenient to disassemble the top plate, which reduces the practicability of the device and increases the workload of disassembly.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a power adapter with an external heat dissipation device, comprising a main body, a heat dissipation cover is provided on the outer surface of the main body, a protective cover is provided on the outer surface of the main body, a rubber cover is provided on the outer surface of the main body, a top plate is provided on the top of the protective cover, an insertion groove matching the main body is provided on the top plate, the top plate is arranged to be hollow, two second fixing plates are fixedly connected to the bottom wall of the top plate, a second sliding rod is arranged between the two second fixing plates, the bottom of the second sliding rod is slidably connected to the bottom of the inner wall of the top plate, a first limiting mechanism is arranged on the second sliding rod, a displacement rod and a second displacement rod are arranged in the top plate, and the sides opposite to the second displacement rod are arranged to be tilted. The inclined plane, the side of the second sliding rod close to the displacement rod is set in a triangular trapezoidal shape, a fixing plate is set on the side opposite to the displacement rod and the second displacement rod, the bottom of the fixing plate is fixedly connected to the inner wall of the top plate, the two fixing plates are fixedly connected on the opposite sides with fixing rods, the side of the front fixing rod close to the second displacement rod slides into the interior of the second displacement rod, the side of the rear fixing rod close to the displacement rod slides into the interior of the displacement rod, a spring is fixedly connected between the displacement rod and the fixing plate and between the second displacement rod and the fixing plate, the spring movably sleeve is arranged on the outside of the fixing rod, the displacement rod and the side of the second displacement rod close to the second sliding rod are fixedly connected with a moving rod, and four second limiting mechanisms are set at the bottom of the top plate.

[0006] Preferably, the first limiting mechanism includes a fixed block, the bottom of which is fixedly connected to the top surface of the second sliding rod, a connecting groove is provided on the top plate, the connecting groove connects the inside of the top plate with the outside, and the connecting groove extends from the top of the fixed block and is slidably connected to the connecting groove.

[0007] Preferably, a sliding rod is provided on the top of the fixed block, a cavity is opened inside the second sliding rod, the bottom of the sliding rod slides through the interior of the fixed block and extends into the cavity, a fixing ring is fixedly sleeved on the outer surface of the bottom end of the sliding rod, a second fixing rod is fixedly connected to the bottom of the inner wall of the cavity, the other end of the second fixing rod slides through the interior of the sliding rod, a second spring is fixedly connected between the sliding rod and the inner wall of the cavity, and the second spring is movably sleeved on the outside of the second fixing rod.

[0008] Preferably, two stabilizing blocks are fixedly connected between the inner walls on both sides of the cavity, and the two stabilizing blocks are respectively arranged on both sides of the fixing ring. A sliding groove is provided on the stabilizing block, and a limiting block is slidably connected in the sliding groove. Two second limiting grooves matching the limiting blocks are provided on the opposite sides of the two second fixing plates.

[0009] Preferably, a rotating rod is rotatably connected between the two limit blocks and the fixing ring, and opposite sides of the two limit blocks slide through the interior of the second sliding rod and extend into the second limit groove on the same side.

[0010] Preferably, four of the second limiting mechanisms are arranged in a circular array at the bottom of the sliding plate, and the second limiting mechanism includes a sliding plate, which is arranged at the bottom of the top plate, the sliding plate is parallel to the four through grooves, the top of the sliding plate contacts and slides with the bottom surface of the top plate, and a connecting plate is slidably connected in the four through grooves.

[0011] Preferably, the four connecting plates extend into the interior of the top plate on one side away from the sliding plate, and are fixedly connected to the bottom surfaces of the two moving rods, the displacement rod and the second displacement rod on the same side, and the other side of the connecting plate extends out of the through groove and is fixedly connected to the top surface of the sliding plate on the same side.

[0012] Preferably, the other sides of the four sliding plates are fixedly connected to a limiting plate, and the protective cover is provided with a limiting groove matching the limiting plate.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. A power adapter with a heat dissipation device on the outside, when the top plate is not installed, the side of the fixed block away from the displacement rod is in contact with the side of the connecting groove. At this time, the second spring makes the sliding rod located at a longer distance from the top of the fixed block. At the same time, the two limit blocks respectively extend into the second limit grooves away from the displacement rod on the second fixed plate on the same side, and the fixed block cannot drive the second sliding rod to move in the direction of the displacement rod. Through the above method, the installation and disassembly of the top plate can be achieved by controlling the sliding rod and the fixed block, which maximizes the convenience of the mechanism during disassembly and increases the practicality of the device.

[0015] 2. For a power adapter with a heat dissipation device on the outside, after the shell is installed, the first limiting mechanism is used to enable the second limiting mechanism to operate, and the top plate is limited so that it cannot be separated from the protective cover. When the top plate needs to be installed, the first limiting mechanism is contacted to make the second sliding rod slide, and the two second fixed plates limit the sliding position of the second sliding rod. In the above manner, the stability of the mechanism during use can be maximized through the limiting block and the second limiting groove, the limiting plate and the limiting groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0017] Figure 1 This is a schematic diagram of the overall structure of a power adapter with an external heat dissipation device according to the utility model;

[0018] Figure 2 This is a schematic diagram of the external structure of the power adapter body of the utility model;

[0019] Figure 3 This is a cross-sectional view of the overall structure of the protective cover of the utility model;

[0020] Figure 4 This is a schematic diagram of the overall structure of the top plate of the utility model;

[0021] Figure 5 This is a schematic cross-sectional view of the interior of the top plate of the utility model;

[0022] Figure 6 This is a schematic diagram of the bottom structure of the top plate of the utility model;

[0023] Figure 7 This is an exploded schematic diagram of the sliding rod connection structure of the utility model;

[0024] Figure 8 It is a schematic cross-sectional view of the interior of the sliding rod of the utility model.

[0025] : Illustration symbols: 1. rubber sleeve; 2. protective cover; 3. top plate; 4. sliding rod; 5. fixed block; 6. connecting groove; 7. insertion groove; 8. heat dissipation cover; 9. main body; 10. limiting groove; 11. fixing rod; 12. fixing plate; 13. displacement rod; 14. second displacement rod; 15. spring; 16. moving rod; 17. second fixing plate; 18. second sliding rod; 19. through groove; 20. sliding plate; 21. limiting plate; 22. second limiting groove; 23. limiting block; 24. second fixing rod; 25. second spring; 26. fixing ring; 27. rotating rod; 28. stabilizing block; 29. ​​connecting plate. DETAILED DESCRIPTION

[0026] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0027] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present utility model, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0030] See also Figure 1-8The utility model provides a technical solution: a power adapter with an external heat dissipation device, including a main body 9, a heat dissipation cover 8 is sleeved on the outer surface of the main body 9, a protective cover 2 is sleeved on the outer surface of the main body 9, a rubber sleeve 1 is sleeved on the outer surface of the main body 9, a top plate 3 is arranged on the top of the protective cover 2, an insertion slot 7 adapted to the main body 9 is opened on the top plate 3, the top plate 3 is arranged to be hollow, two second fixing plates 17 are fixedly connected to the bottom wall of the top plate 3, a second sliding rod 18 is arranged between the two second fixing plates 17, the bottom of the second sliding rod 18 is slidably connected to the bottom of the inner wall of the top plate 3, a first limiting mechanism is arranged on the second sliding rod 18, and a position limit mechanism is arranged in the top plate 3. The shift rod 13 and the second shift rod 14, and the side opposite to the shift rod 13 and the second shift rod 14 are both set as inclined surfaces, and the side of the second sliding rod 18 close to the shift rod 13 is set as a triangular trapezoidal shape, and the trapezoidal inclined surface matches the inclined surfaces of the shift rod 13 and the second shift rod 14, and the shift rod 13 and the second shift rod 14 are both provided with a fixing plate 12 on the opposite side of the second shift rod 14, and the bottom of the fixing plate 12 is fixedly connected to the inner wall of the top plate 3, and the two fixing plates 12 are fixedly connected to the opposite sides of the two fixing plates 12. The front side fixing rod 11 slides through the inside of the second shift rod 14 on the side close to the second shift rod 14, and the rear side fixing rod 11 slides through the side close to the shift rod 13 The spring 15 is inserted into the displacement rod 13, and the displacement rod 13 and the fixed plate 12 are fixedly connected with the second displacement rod 14 and the fixed plate 12. The spring 15 is movably sleeved on the outside of the fixed rod 11. The displacement rod 13 and the second displacement rod 14 are fixedly connected with the moving rod 16 on one side close to the second sliding rod 18. Four second limiting mechanisms are arranged at the bottom of the top plate 3. After the shell is installed, the second limiting mechanism is operated through the first limiting mechanism to limit the top plate 3 so that it cannot be separated from the protective cover 2. When the top plate needs to be installed, the first limiting mechanism is contacted to make the second sliding rod 18 slide, and the two second fixed plates 17 are used to limit the second sliding rod 18. The sliding position of the rod 18 is limited. When the triangular trapezoidal side on the second sliding rod 18 contacts the inclined surface formed by the displacement rod 13 and the second displacement rod 14, the second sliding rod 18 pushes the displacement rod 13 and the second displacement rod 14 to move synchronously to the opposite side. When the displacement rod 13 and the second displacement rod 14 move, the moving rod 16 fixedly connected on the same side is driven to move synchronously, and the spring 15 on the same side is forced to contract. At the same time, the fixed rod 11 on the same side limits the displacement rod 13 and the second displacement rod 14. When the displacement rod 13 and the second displacement rod 14 move to the appropriate position, the second limiting mechanism is driven to limit the top plate 3. When the top plate needs to be removed, this step is performed in reverse.

[0031] Furthermore, the first limiting mechanism includes a fixed block 5, the bottom of which is fixedly connected to the top surface of the second sliding rod 18, a connecting groove 6 is provided on the top plate 3, the connecting groove 6 connects the inside of the top plate 3 with the outside, and the connecting groove 6 extends from the top of the fixed block 5 and is slidably connected to the connecting groove 6;

[0032] Further, a sliding rod 4 is provided on the top of the fixed block 5, a cavity is provided inside the second sliding rod 18, the bottom of the sliding rod 4 slides through the interior of the fixed block 5 and extends into the cavity, a fixing ring 26 is fixedly sleeved on the outer surface of the bottom end of the sliding rod 4, a second fixing rod 24 is fixedly connected to the bottom of the inner wall of the cavity, the other end of the second fixing rod 24 slides through the interior of the sliding rod 4, a second spring 25 is fixedly connected between the sliding rod 4 and the inner wall of the cavity, and the second spring is movably sleeved on the outside of the second fixing rod 24;

[0033] Furthermore, two stabilizing blocks 28 are fixedly connected between the inner walls on both sides of the cavity. The two stabilizing blocks 28 are respectively arranged on both sides of the fixing ring 26. A sliding groove is provided on the stabilizing block 28, and a limiting block 23 is slidably connected in the sliding groove. Two second limiting grooves 22 matching the limiting blocks 23 are provided on the opposite sides of the two second fixing plates 17.

[0034] Furthermore, a rotating rod 27 is rotatably connected between the two limit blocks 23 and the fixing ring 26, and the opposite sides of the two limit blocks 23 slide through the interior of the second sliding rod 18 and extend into the second limit groove 22 on the same side. When the top plate 3 is not installed, the side of the fixing block 5 away from the displacement rod 13 fits the side of the connecting groove 6. At this time, the second spring 25 makes the sliding rod 4 located at a longer distance from the top of the fixing block 5. At the same time, the two limit blocks 23 extend into the second limit groove 22 away from the displacement rod 13 on the second fixing plate 17 on the same side, respectively, and make the fixing block 5 unable to drive the second sliding rod 18 to move in the direction of the displacement rod 13. When installing the top plate 3, first cover the top plate 3 at a suitable position on the top of the protective cover 2, and then press the sliding rod 4 downward to locate one end of the sliding rod 4 in the cavity, drive the fixing ring 26 to move downward, and compress the second spring 25. At this time, the second fixed rod 24 limits the sliding rod 4. When the fixed ring 26 moves downward, the two limiting blocks 23 are driven by the two rotating rods 27 to slide into the second sliding rod 18 along the sliding groove on the stabilizing block 28 into the second sliding rod 18. When sliding to a suitable position, the restriction on the second sliding rod 18 is released, and then the fixed block 5 is pushed to make the second sliding rod 18 move horizontally in the direction of the displacement rod 13 and the second displacement rod 14. When moving to a suitable position, the limiting block 23 slides into the second limiting groove 22 on the second fixed plate 17 close to the displacement rod 13, and the second limiting mechanism works synchronously to limit the top plate 3.

[0035] Furthermore, four second limiting mechanisms are arranged in a circular array at the bottom of the sliding plate 20, and the second limiting mechanism includes a sliding plate 20, which is arranged at the bottom of the top plate 3, and the sliding plate 20 is parallel to the four through grooves 19. The top of the sliding plate 20 contacts and slides with the bottom surface of the top plate 3, and a connecting plate 29 is slidably connected in the four through grooves 19.

[0036] Furthermore, one side of the four connecting plates 29 away from the sliding plate 20 respectively extends into the interior of the top plate 3 and is fixedly connected to the bottom surfaces of the two moving rods 16, the displacement rod 13 and the second displacement rod 14 on the same side, and the other side of the connecting plate 29 extends out of the through slot 19 and is fixedly connected to the top surface of the sliding plate 20 on the same side;

[0037] Furthermore, the other sides of the four sliding plates 20 are fixedly connected to the limiting plates 21, and the protective cover 2 is provided with limiting grooves 10 that match the limiting plates 21. When the displacement rod 13 and the second displacement rod 14 move horizontally in opposite directions, the moving rod 16 on the same side is synchronously driven to move horizontally relatively, so that the four connecting plates 29 synchronously drive the four sliding plates 20 to move toward the side close to the protective cover 2. When the fixed block 5 moves to a suitable position, the limiting plates 21 on the four sliding plates 20 slide into the matching limiting grooves 10. At this time, the first limiting mechanism prevents the second sliding rod 18 from moving, and the sliding plate 20 will not fall off the limiting grooves 10, so as to fix the top plate 3. When disassembly is required, the first limiting mechanism is released, and when the fixed block 5 moves to a suitable position, the sliding plate 20 slides out of the limiting grooves 10, and the restriction on the top plate 3 is released.

[0038] Working principle: when the housing is installed and used, the second limiting mechanism is activated through the first limiting mechanism to limit the top plate 3 so that it cannot be separated from the protective cover 2. When the top plate needs to be installed, the first limiting mechanism is contacted to make the second sliding rod 18 slide, and the two second fixed plates 17 limit the sliding position of the second sliding rod 18. When the triangular trapezoidal side of the second sliding rod 18 contacts the inclined surface formed by the displacement rod 13 and the second displacement rod 14, the second sliding rod 18 pushes the displacement rod 13 and the second displacement rod 14 to move synchronously to the opposite side. When the displacement rod 13 and the second displacement rod 14 move, the moving rod 16 fixedly connected on the same side is driven to move synchronously, and the spring 15 on the same side is forced to contract. At the same time, the fixed The fixed rod 11 limits the displacement rod 13 and the second displacement rod 14. When the displacement rod 13 and the second displacement rod 14 move to the appropriate position, the second limiting mechanism is driven to limit the top plate 3. When the top plate needs to be removed, the operation steps are reversed. When the top plate 3 is not installed, the side of the fixing block 5 away from the displacement rod 13 is in contact with the side of the connecting groove 6. At this time, the second spring 25 makes the sliding rod 4 located at a longer distance from the top of the fixing block 5. At the same time, the two limiting blocks 23 extend into the second limiting groove 22 away from the displacement rod 13 on the second fixing plate 17 on the same side, and the fixing block 5 cannot drive the second sliding rod 18 to move in the direction of the displacement rod 13. When installing the top plate 3, first cover the top plate 3 at a suitable position on the top of the protective cover 2, and then The sliding rod 4 is pressed downward so that one end of the sliding rod 4 is located in the cavity, driving the fixing ring 26 to move downward, and compressing the second spring 25. At this time, the second fixing rod 24 limits the sliding rod 4. When the fixing ring 26 moves downward, the two limiting blocks 23 are driven by the two rotating rods 27 to slide into the second sliding rod 18 along the sliding groove on the stabilizing block 28 into the second sliding rod 18. When sliding to a suitable position, the restriction on the second sliding rod 18 is released, and then the fixing block 5 is pushed to make the second sliding rod 18 move horizontally in the direction of the displacement rod 13 and the second displacement rod 14. When moving to a suitable position, the limiting block 23 slides into the second limiting groove 22 on the second fixing plate 17 close to the displacement rod 13, and the second The limiting mechanism works to limit the top plate 3. When the displacement rod 13 and the second displacement rod 14 move horizontally in opposite directions, the moving rod 16 on the same side is synchronously driven to move horizontally relative to each other, so that the four connecting plates 29 synchronously drive the four sliding plates 20 to move toward the side close to the protective cover 2. When the fixed block 5 moves to the appropriate position, the limiting plates 21 on the four sliding plates 20 slide into the matching limiting grooves 10. At this time, the first limiting mechanism prevents the second sliding rod 18 from moving, and the sliding plate 20 will not fall off the limiting grooves 10, thereby fixing the top plate 3. When disassembly is required, the first limiting mechanism is released. When the fixed block 5 moves to the appropriate position, the sliding plate 20 slides out of the limiting grooves 10, thereby releasing the restriction on the top plate 3.

[0039] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A power adapter with an external heat dissipation device, comprising a main body (9), characterized in that: The outer surface of the main body (9) is sleeved with a heat dissipation cover (8), the outer surface of the main body (9) is sleeved with a protective cover (2), the outer surface of the main body (9) is sleeved with a rubber cover (1), a top plate (3) is arranged on the top of the protective cover (2), an insertion groove (7) adapted to the main body (9) is opened on the top plate (3), the top plate (3) is arranged to be hollow, two second fixing plates (17) are fixedly connected to the bottom wall of the top plate (3), a second sliding rod (18) is arranged between the two second fixing plates (17), the bottom of the second sliding rod (18) is slidably connected to the bottom of the inner wall of the top plate (3), a first limiting mechanism is arranged on the second sliding rod (18), a displacement rod (13) and a second displacement rod (14) are arranged in the top plate (3), the sides of the displacement rod (13) and the second displacement rod (14) opposite to each other are arranged as inclined surfaces, a side of the second sliding rod (18) close to the displacement rod (13) is arranged in a triangular trapezoidal shape, and the displacement rod (13) is arranged in a triangular trapezoidal shape. A fixing plate (12) is provided on the side opposite to the displacement rod (13) and the second displacement rod (14); the bottom of the fixing plate (12) is fixedly connected to the inner wall of the top plate (3); the two fixing plates (12) are fixedly connected to fixing rods (11) on the sides facing each other; the side of the front fixing rod (11) close to the second displacement rod (14) slides into the interior of the second displacement rod (14); the side of the rear fixing rod (11) close to the displacement rod (13) slides into the interior of the displacement rod (13); a spring (15) is fixedly connected between the displacement rod (13) and the fixing plate (12) and between the second displacement rod (14) and the fixing plate (12); the spring (15) is movably sleeved on the outside of the fixing rod (11); the sides of the displacement rod (13) and the second displacement rod (14) close to the second sliding rod (18) are fixedly connected to a moving rod (16); and four second limiting mechanisms are provided at the bottom of the top plate (3).

2. A power adapter with an external heat dissipation device according to claim 1, characterized in that: The first limiting mechanism comprises a fixed block (5), the bottom of the fixed block (5) being fixedly connected to the top surface of the second sliding rod (18), a connecting groove (6) being provided on the top plate (3), the connecting groove (6) allowing the inside of the top plate (3) to communicate with the outside, and the top of the fixed block (5) extending out of the connecting groove (6) and being slidably connected to the connecting groove (6).

3. A power adapter with an external heat dissipation device according to claim 2, characterized in that: A sliding rod (4) is arranged on the top of the fixed block (5), a cavity is opened inside the second sliding rod (18), the bottom of the sliding rod (4) slides through the interior of the fixed block (5) and extends into the cavity, a fixing ring (26) is fixedly sleeved on the outer surface of the bottom end of the sliding rod (4), a second fixing rod (24) is fixedly connected to the bottom of the inner wall of the cavity, the other end of the second fixing rod (24) slides through the interior of the sliding rod (4), a second spring (25) is fixedly connected between the sliding rod (4) and the inner wall of the cavity, and the second spring is movably sleeved on the outside of the second fixing rod (24).

4. The power adapter with an external heat dissipation device according to claim 3, characterized in that: Two stabilizing blocks (28) are fixedly connected between the inner walls of both sides of the cavity. The two stabilizing blocks (28) are respectively arranged on both sides of the fixing ring (26). A sliding groove is provided on the stabilizing block (28), and a limiting block (23) is slidably connected in the sliding groove. Two second limiting grooves (22) matching the limiting blocks (23) are provided on the opposite sides of the two second fixing plates (17).

5. The power adapter with an external heat dissipation device according to claim 4, characterized in that: A rotating rod (27) is rotatably connected between the two limit blocks (23) and the fixing ring (26), and opposite sides of the two limit blocks (23) slide through the interior of the second sliding rod (18) and extend into the second limit groove (22) on the same side.

6. The power adapter with an external heat dissipation device according to claim 1, characterized in that: Four of the second limiting mechanisms are arranged in a circular array at the bottom of the sliding plate (20), the second limiting mechanism comprising a sliding plate (20), the sliding plate (20) being arranged at the bottom of the top plate (3), the sliding plate (20) being parallel to the four through grooves (19), the top of the sliding plate (20) being in contact with and sliding on the bottom surface of the top plate (3), and four connecting plates (29) being slidably connected in the four through grooves (19).

7. The power adapter with an external heat dissipation device according to claim 6, characterized in that: The four connecting plates (29) extend into the interior of the top plate (3) on one side away from the sliding plate (20) and are fixedly connected to the bottom surfaces of the two moving rods (16), the displacement rod (13) and the second displacement rod (14) on the same side. The other side of the connecting plate (29) extends out of the through slot (19) and is fixedly connected to the top surface of the sliding plate (20) on the same side.

8. The power adapter with an external heat dissipation device according to claim 7, characterized in that: The other sides of the four sliding plates (20) are all fixedly connected to a limiting plate (21), and a limiting groove (10) matching the limiting plate (21) is provided on the protective cover (2).

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