Composite heat-conducting PCB (printed circuit board)

Abstract

The invention relates to the technical field of circuit boards, in particular to a composite heat-conducting PCB (printed circuit board), which comprises a substrate for bearing an electronic component, and further comprises a heat-conducting plate mechanism, a heat-conducting plate, a heat-conducting plate, a heat-conducting plate and a heat-conducting plate, the heat conduction layer is made of a silicone grease material and smeared between the heat conduction plate mechanism and the substrate, and the length and the width of the heat conduction layer are the same as those of the substrate; the conveying pump unit, the coil pipe and the column body with the cavity groove form a circulation pipeline with the closed head and tail, reciprocating motion of the piston is used for driving heat conduction oil to enter the pipe body through the first short pipe, one-way flowing of a medium is ensured through the one-way assembly, and after the heat conduction oil flows through the coil pipe to absorb heat, U-shaped heat release is conducted through the cavity groove of the column body; meanwhile, the heat exchange area is enlarged through the through holes, heat absorption and heat release relay points are formed, the overall heat conduction efficiency is improved, and the problems that the bottom of a traditional PCB is smooth and the heat dissipation path is single are solved.

Description

Technical Field

[0001] This invention relates to the field of circuit board technology, specifically to a composite thermally conductive PCB circuit board. Background Technology

[0002] A PCB (Printed Circuit Board) is a substrate used for electrical connections in electronic products. It carries components such as resistors and capacitors and enables signal transmission. When electronic products are running, the PCB generates heat due to the current flowing through it. This heat accumulates on the PCB, and if the heat continues to accumulate, it may cause component failure. Therefore, many electronic products have built-in fans to actively cool the PCB by blowing air through it. This airflow removes the heat, ensuring stable circuit operation and extending the life of the device.

[0003] When PCB circuit boards are used for heat dissipation, the top of the circuit board is covered with a large number of electronic components, which are distributed at different heights and in an disorderly manner. Some electronic components near the fan are relatively tall, which can easily obstruct the airflow to the shorter electronic components located in the same straight line. This causes the heat of these electronic components to be transferred to the surface of the circuit board. However, because the bottom area of ​​the circuit board is smooth, it is difficult for the airflow to stay, resulting in a small effective airflow area and low heat dissipation efficiency. To compensate for this defect, the fan power needs to be increased to enhance the airflow and ensure the heat dissipation effect. However, high power operation will significantly increase the energy consumption of electronic products. Summary of the Invention

[0004] The purpose of this invention is to provide a composite thermally conductive PCB circuit board to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a composite thermally conductive PCB circuit board, comprising a substrate for supporting electronic components, and further comprising: The heat-conducting plate mechanism has a built-in circulation pipeline for the flow of cooling medium and a pump set for driving the flow of cooling medium. The thermal conductive layer is made of silicone grease and is applied between the thermal conductive plate mechanism and the substrate. The length and width of the thermal conductive layer are the same as those of the substrate.

[0006] Preferably, the heat-conducting plate mechanism includes: The heat-conducting plate is made of a copper plate with the same length and width as the substrate, and the heat-conducting plate is fixed to the substrate. A groove is formed on one side of the bottom of the heat-conducting plate body; The coil is located inside the heat-conducting plate. The coil has a meandering design in some parts and is made of copper for the cooling medium to flow inside. A delivery pump unit is disposed inside the groove, the delivery pump unit is connected to the coil and is used to drive the flow of cooling medium inside the coil; The heat-conducting column unit penetrates the heat-conducting plate and the coil. The number of heat-conducting column units is several rows and is designed in a stepped shape to increase the air-receiving area at the bottom of the heat-conducting plate.

[0007] Preferably, the delivery pump unit includes: A tube body is disposed inside the groove, and a collar is fixed to the outside of the tube body; The first short pipe is connected to the pipe body and the coil respectively. The other side of the pipe body is also connected to the second short pipe, and the other end of the second short pipe is connected to the coil. The first short pipe, the pipe body, the second short pipe and the coil form a circulation pipeline. Two sets of unidirectional components are respectively located inside the first short tube and the second short tube. The unidirectional components are designed to open only in one direction. The movable rod is slidably connected to the inner wall of the collar, and a miniature roller is bolted to the end of the movable rod away from the tube body; The piston is fixed to the movable rod and slidably connected to the inner wall of the tube. A power assembly, partially located on the outside of the groove, is used to drive the movable rod to reciprocate back and forth. An elastic component applies a spring force to the movable rod.

[0008] Preferably, the unidirectional component consists of a ring body and a rotating cover. There are two sets of ring bodies, which are respectively fixed inside the first short tube and the second short tube. The rotating cover is hinged to the ring body. The rotating cover located inside the first short tube can only be opened towards the inside of the tube, and the rotating cover located inside the second short tube can only be opened towards the direction away from the inside of the tube.

[0009] Preferably, the rotating cover is circular in design and its outer diameter is larger than the inner diameter of the ring.

[0010] Preferably, the power assembly includes: The first rotating column is rotatably connected to the inside of the groove. An elliptical wheel is fixed on the surface of the first rotating column. The elastic component applies elastic force to the movable rod to make the micro roller and the elliptical wheel contact each other. The second rotating column is rotatably connected to the inside of the groove, and the first rotating column and the second rotating column are connected by gear transmission. The third rotating column is also rotatably connected to the inside of the groove, and the third rotating column is connected to the second rotating column through a gear transmission. The turntable is bolted to the surface of the third rotating column; The blades, in number, are fixed to the surface of the turntable.

[0011] Preferably, the blades distributed on the side of the turntable surface away from the second rotating column are located outside the groove, and the bottom of the blades is flush with the bottom of the heat-conducting plate.

[0012] Preferably, the elastic component consists of a short rod, a circular plate, a compression spring, and a sliding hole. The circular plate is bolted to the surface of the movable rod, the short rod is fixed to the inner wall of the groove, the sliding hole is opened on the surface of the circular plate, and the short rod is slidably connected to the inner wall of the sliding hole. The two ends of the compression spring are in contact with the circular plate and the ring, respectively.

[0013] Preferably, the heat-conducting column unit consists of a column, a cavity, and a through hole. There are several columns, and the columns pass through the heat-conducting plate and the coil in sequence. The cavity is U-shaped and is opened inside the column. The inlet and outlet of the cavity are located inside the coil. The through hole is opened on the surface of the column.

[0014] Preferably, the column is made of copper, and the length of the column gradually increases towards the side away from the groove, with several rows of the column being staggered among each other.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The delivery pump unit in this invention forms a closed-loop circulation pipeline with the coil and the grooved column. The reciprocating motion of the piston drives the heat transfer oil to enter the pipe through the first short pipe. The unidirectional component ensures unidirectional flow of the medium. After the heat transfer oil absorbs heat through the coil, it releases heat in a U-shape through the groove of the column, avoiding the attenuation of heat absorption effect over a long path. At the same time, the through hole expands the heat exchange area, forming a heat absorption and release relay point, improving the overall heat conduction efficiency and solving the problem of smooth bottom and single heat dissipation path of traditional PCBs.

[0016] 2. In this invention, the power component drives the turntable to rotate via wind power through blades, which in turn drives the elliptical wheel to rotate through gear transmission. With the cooperation of the compression spring in the elastic component, the miniature roller alternately contacts the long and short radius ends of the elliptical wheel, pushing the movable rod to reciprocate, thus achieving the mechanical drive of the piston. This allows the delivery pump unit to circulate and transport the medium. This design directly utilizes the wind energy generated by the internal fan of the electrical equipment as a power source, eliminating the need for additional power consumption. Compared with the traditional heat dissipation solution that requires an independent pump group, this significantly reduces the energy consumption of the equipment. At the same time, the blades are exposed outside the grooves, which avoids wind dispersion, ensures stable rotation of the turntable, and improves the reliability of power transmission.

[0017] 3. The columns in this invention adopt a stepped distribution design, that is, the length increases towards the side away from the groove, to avoid the long columns in the front row blocking the airflow to the rear row. Moreover, the staggered distribution of the columns forms air duct gaps, which, together with the through holes on the surface of the columns, generates a turbulence effect, prolongs the air residence time and increases the effective airflow area. In addition, combined with the U-shaped heat exchange path of the cavity, it achieves dual heat dissipation enhancement of forced convection and heat conduction, improving the cooling effect on the circuit board itself without increasing the power of the blower fan. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure in this invention; Figure 2 This is a schematic diagram showing the substrate, heat-conducting layer, and heat-conducting plate mechanism after they are separated from each other in this invention. Figure 3 This is a bottom view in this invention; Figure 4 This is a side oblique view in the present invention; Figure 5 This is a cross-sectional view of the heat-conducting plate in this invention; Figure 6 This is a schematic diagram of the coil structure in this invention; Figure 7 This is a schematic diagram of the structure of the power component and the elastic component in this invention; Figure 8 This is a cross-sectional view of the tube body, the first short tube, the second short tube, and the collar in this invention; Figure 9 This is a schematic diagram of the structure of the column and its surface in this invention; Figure 10 This is a cross-sectional view of the column in this invention.

[0019] In the diagram: 100, substrate; 200, heat-conducting layer; 300, heat-conducting plate mechanism; 310, heat-conducting plate body; 320, groove; 330, delivery pump unit; 331, pipe body; 331a, collar; 332, first short pipe; 333, second short pipe; 334, unidirectional assembly; 334a, ring body; 334b, rotating cover; 335, piston; 336, power assembly; 336a, first rotating column; 336b, ellipse 336c, Second rotating column; 336d, Third rotating column; 336e, Blade; 336f, Turntable; 337, Elastic component; 337a, Short rod; 337b, Circular plate; 337c, Compression spring; 337d, Sliding hole; 338, Miniature roller; 339, Movable rod; 340, Coil; 350, Heat-conducting column unit; 351, Column; 352, Cavity; 353, Through hole; 360, Side ear. Detailed Implementation

[0020] 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.

[0021] Please see Figures 1-10 As shown, a composite thermally conductive PCB circuit board includes a substrate 100 for carrying electronic components, a thermally conductive plate mechanism 300 and a thermally conductive layer 200. The thermally conductive plate mechanism 300 has a built-in circulation pipeline for the flow of cooling medium and a pump group for driving the flow of cooling medium. The thermally conductive layer 200 is made of silicone grease and is applied between the thermally conductive plate mechanism 300 and the substrate 100. The length and width of the thermally conductive layer 200 are the same as the length and width of the substrate 100.

[0022] Specifically, the heat-conducting plate mechanism 300 includes a heat-conducting plate body 310, a groove 320, a coil 340, a delivery pump unit 330, and a heat-conducting pillar unit 350. The heat-conducting plate body 310 is made of a copper plate with the same length and width as the substrate 100. The heat-conducting plate body 310 and the substrate 100 are fixed to each other by screws. Threaded holes are opened at the edge of the heat-conducting plate body 310, and holes are opened at the edge of the substrate 100 for the screws to pass through, thus fixing the heat-conducting plate body 310 and the substrate 100 to each other. A thermally conductive layer 200 of silicone grease is applied between the substrate 100 and the heat-conducting plate body 310. The groove 320 is opened on one side of the bottom of the heat-conducting plate body 310. The coil 340 is set inside the heat-conducting plate body 310. The coil 340 has a meandering design in some parts, and the coil 340 is made of copper and is used for the flow of cooling medium inside. The heat-conducting pillar unit 350 penetrates the heat-conducting plate body 310 and the coil 340.

[0023] A delivery pump unit 330 is disposed inside the groove 320. The delivery pump unit 330 is connected to the coil 340 and is used to drive the flow of cooling medium inside the coil 340. Further, the delivery pump unit 330 includes a pipe body 331, a first short pipe 332, a one-way assembly 334, a movable rod 339, a piston 335, a power assembly 336, and an elastic assembly 337. The pipe body 331 is disposed inside the groove 320, and a collar 331a is fixed to the outside of the pipe body 331. The first short pipe 332 is interconnected with both the pipe body 331 and the coil 340. The other end of the pipe body 331... A second short tube 333 is also connected to one side, and the other end of the second short tube 333 is connected to the coil 340. The first short tube 332, the tube body 331, the second short tube 333 and the coil 340 form a circulation pipeline. The first short tube 332, the tube body 331 and the second short tube 333 are made of plastic to reduce the weight of the entire circuit board. The movable rod 339 is slidably connected to the inner wall of the collar 331a. A miniature roller 338 is bolted to the end of the movable rod 339 away from the tube body 331. The piston 335 is fixed to the movable rod 339 and slidably connected to the inner wall of the tube body 331.

[0024] Two sets of one-way components 334 are respectively disposed inside the first short tube 332 and the second short tube 333. Each one-way component 334 is designed to open only in one direction. Furthermore, each one-way component 334 consists of a ring body 334a and a rotating cover 334b. Two sets of ring bodies 334a are respectively fixed inside the first short tube 332 and the second short tube 333. The rotating cover 334b ​​is hinged to the ring body 334a. The rotating cover 334b ​​is located inside the first short tube 332. The rotating cover 334b ​​can only be opened towards the inside of the tube body 331. The rotating cover 334b ​​located inside the second short tube 333 can only be opened towards the direction away from the inside of the tube body 331, ensuring that the cooling medium flows in the direction of the first short tube 332 → tube body 331 → second short tube 333. The rotating cover 334b ​​is circular and its outer diameter is larger than the inner diameter of the ring body 334a, ensuring that the rotating cover 334b ​​can completely cover the inner side of the ring body 334a after it is attached to the ring body 334a.

[0025] The power assembly 336, partially located outside the groove 320, drives the movable rod 339 to reciprocate. Further, the power assembly 336 includes a first rotating column 336a, a second rotating column 336c, a third rotating column 336d, a turntable 336f, and a blade 336e. The first rotating column 336a is rotatably connected to the interior of the groove 320. An elliptical wheel 336b is fixed to the surface of the first rotating column 336a. The elastic component 337 applies elastic force to the movable rod 339, causing the miniature roller 338 to contact the elliptical wheel 336b. The second rotating column 336c is rotatably connected to the interior of the groove 320. The first rotating column 336a and the second rotating column 336c are connected via gear transmission. Similarly, the third rotating column 336d is rotatably connected to the interior of the groove 320. The third rotating column 336d and the second rotating column 336c are connected via gear transmission. The rotating disk 336f is bolted to the surface of the third rotating column 336d. Several blades 336e are fixed to the surface of the rotating disk 336f. The blades 336e distributed on the surface of the rotating disk 336f away from the second rotating column 336c are located outside the groove 320. The bottom of the blades 336e is flush with the bottom of the heat-conducting plate 310. When the wind blows, the blades 336e that protrude from the outside of the groove 320 are blown by the wind and move continuously, driving the rotating disk 336f to rotate stably. This prevents all the blades 336e from being affected by the wind at the same time and causing the rotating disk 336f to remain stationary. The rotating disk 336f, blades 336e, first rotating column 336a, second rotating column 336c, third rotating column 336d, elliptical wheel 336b and gears used for transmission are all made of plastic, which reduces weight and makes it easier to move in the wind.

[0026] The elastic component 337 applies a spring force to the movable rod 339. Further, the elastic component 337 comprises a short rod 337a, a circular plate 337b, a compression spring 337c, and a sliding hole 337d. The circular plate 337b is bolted to the surface of the movable rod 339. The short rod 337a is fixed to the inner wall of the groove 320. The sliding hole 337d is formed on the surface of the circular plate 337b, and the short rod 337a is slidably connected to the inner wall of the sliding hole 337d. The compression spring 337c... The ends are in contact with the circular plate 337b and the ring 334a respectively. The force of the compression spring 337c is applied to the surface of the movable rod 339 through the circular plate 337b, causing the miniature roller 338 to fit against the surface of the elliptical wheel 336b. Moreover, as the circular plate 337b moves back and forth with the movable rod 339, it can slide along the surface of the short rod 337a through the sliding hole 337d, increasing the motion stability of the circular plate 337b and the movable rod 339.

[0027] The heat-conducting plate body 310 also has side lugs 360 with holes welded on its side for screws or bolts to pass through and fix the entire circuit board to the inside of the electronic product.

[0028] The heat-conducting column units 350 are arranged in several rows in a stepped design to increase the airflow area at the bottom of the heat-conducting plate 310. Furthermore, each heat-conducting column unit 350 consists of a column 351, a cavity 352, and a through hole 353. Several columns 351 are present, passing through the heat-conducting plate 310 and the coil 340. The cavity 352 is U-shaped and located inside the column 351, with its inlet and outlet ends located inside the coil 340. The through hole 353 is located on the surface of the column 351. The column 351 is made of copper, and its length gradually increases towards the side furthest from the groove 320. Figure 4 (Perspective), several rows of columns 351 are staggered among each other ( Figure 3 (From the perspective) Due to the obstruction of the column 351, the coil 340 is divided into a passage extending to the bottom of the heat-conducting plate 310 by multiple columns 351 and the U-shaped cavity 352, which expands the air receiving area. At this time, the first short pipe 332, the pipe body 331, the second short pipe 333, the coil 340 and the cavity 352 form a closed circulation pipeline.

[0029] During the production of this circuit board, heat-conducting oil is first injected into the interior of pipes such as tube 331 and coil 340 as a cooling medium. During installation, the side of the circuit board with the long column 351 needs to be away from the fan. During the operation of the electronic device, the heat of the substrate 100 is transferred to the copper heat-conducting plate 310 through the heat-conducting layer 200. The fan blows towards the circuit board, and the wind drives the blades 336e to move, thereby driving the turntable 336f and the third rotating column 336d to rotate. Through gears, the second rotating column 336c and the first rotating column 336a are driven to rotate, thereby causing the elliptical wheel 336b to rotate. The long radius end and the short radius section of the elliptical wheel 336b alternately contact the micro roller 338, thereby driving the movable rod 339 and the piston 335 to reciprocate. When the piston 335 moves towards the first tube 331, the tube 331... The internal volume decreases (inside the side away from the movable rod 339), squeezing the internal heat transfer oil. This causes the heat transfer oil to push open the rotating cover 334b ​​located inside the second short tube 333. Meanwhile, the rotating cover 334b ​​located inside the first short tube 332 closes with the ring body 334a to prevent the heat transfer oil from flowing back from inside the first short tube 332. When the piston 335 moves away from the first tube body 331, the internal volume of the tube body 331 increases. The heat transfer oil inside the coil 340 enters the interior of the tube body 331 through the first short tube 332. At the same time, the rotating cover 334b ​​inside the second short tube 333 closes with the ring body 334a. The piston 335 reciprocates, transporting the heat transfer oil through the coil 340 → multiple cavities 352 → coil 340 → first short tube 332 → tube body 331 → second short tube 333 → coil 340. The heat transfer oil flows in this manner.

[0030] Heat from the heat-conducting plate 310 is transferred to the internal coil 340, where it is absorbed by the heat-conducting oil. Simultaneously, as the heat-conducting oil passes through the column 351, it enters the cavity 352 and undergoes a U-shaped motion. When the air blows towards the bottom of the circuit board, it passes around the periphery of the column 351. The heat-conducting oil exchanges heat with the periphery through the column 351, increasing the heat exchange effect. Furthermore, through holes 353 are provided on the surface of the column 351, close to the cavity 352, further increasing the heat exchange area. When air passes through the center of the through holes 353, it can stay within the narrow holes for a longer period, increasing the heat exchange time. The heat-conducting oil then returns to the inside of the coil 340 through the other side of the cavity 352 to absorb heat again. In this way, the heat-conducting oil absorbs heat inside the coil 340 while simultaneously releasing heat as it descends into the cavity 352, preventing heat conduction. In situations where the heat absorption effect decreases due to the continuous flow of oil inside the long coil 340, the cooperation of multiple pillars 351 and grooves 352 below the heat-conducting plate 310 serves as a relay point to maintain the heat absorption effect of the heat-conducting oil. At the same time, the pillars 351 are staggered, allowing air to pass through the gaps between them. Some pillars 351 obstruct the airflow, creating turbulence and increasing the airflow residence time to ensure sufficient heat exchange. The pillars 351 are designed in a stepped shape away from the fan, further preventing the long pillars 351 in the front row from blocking the pillars 351 in the back row. In summary, the heat conduction and heat exchange effect of the circuit board is greatly improved, ensuring improved cooling effect on the circuit board itself without increasing the power of the blower fan, saving energy. At the same time, the power used to drive the flow of the cooling medium comes from the air blown out by the fan, eliminating the need for an additional power source and further reducing energy consumption.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] 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 composite thermally conductive PCB circuit board, comprising a substrate (100) for carrying electronic components, characterized in that, Also includes: The heat-conducting plate mechanism (300) has a built-in circulation pipeline for the flow of the cooling medium and a pump set for driving the flow of the cooling medium. The thermal conductive layer (200) is made of silicone grease and is applied between the thermal conductive plate mechanism (300) and the substrate (100). The length and width of the thermal conductive layer (200) are the same as those of the substrate (100).

2. The composite thermally conductive PCB circuit board according to claim 1, characterized in that, The heat-conducting plate mechanism (300) includes: The heat-conducting plate (310) is made of a copper plate with the same length and width as the substrate (100), and the heat-conducting plate (310) and the substrate (100) are fixed to each other; A groove (320) is formed on one side of the bottom of the heat-conducting plate (310); A coil (340) is disposed inside the heat-conducting plate (310). The coil (340) has a meandering design in some parts and is made of copper and is used for the flow of cooling medium inside. A delivery pump unit (330) is disposed inside the groove (320). The delivery pump unit (330) is connected to the coil (340) and is used to drive the flow of cooling medium inside the coil (340). A heat-conducting column unit (350) penetrates the heat-conducting plate (310) and the coil (340). The number of heat-conducting column units (350) is several rows and is designed in a stepped shape to increase the air-receiving area at the bottom of the heat-conducting plate (310).

3. A composite thermally conductive PCB circuit board according to claim 2, characterized in that, The delivery pump unit (330) includes: A tube body (331) is disposed inside the groove (320), and a collar (331a) is fixed to the outside of the tube body (331). The first short pipe (332) is connected to the pipe body (331) and the coil (340) respectively. The other side of the pipe body (331) is also connected to the second short pipe (333), and the other end of the second short pipe (333) is connected to the coil (340). The first short pipe (332), the pipe body (331), the second short pipe (333) and the coil (340) form a circulation pipeline. Two sets of unidirectional components (334) are respectively disposed inside the first short tube (332) and the second short tube (333). The unidirectional components (334) are designed to open in only one direction. The movable rod (339) is slidably connected to the inner wall of the collar (331a), and a miniature roller (338) is bolted to the end of the movable rod (339) away from the tube body (331). The piston (335) is fixed to the movable rod (339) and slidably connected to the inner wall of the tube (331); A power assembly (336), partially located outside the groove (320), is used to drive the movable rod (339) to reciprocate back and forth. The elastic component (337) applies elastic force to the movable rod (339).

4. A composite thermally conductive PCB circuit board according to claim 3, characterized in that, The unidirectional component (334) consists of a ring (334a) and a rotating cover (334b). There are two sets of rings (334a) which are fixed inside the first short tube (332) and the second short tube (333), respectively. The rotating cover (334b) is hinged to the ring (334a). The rotating cover (334b) located inside the first short tube (332) can only be opened towards the inside of the tube (331), and the rotating cover (334b) located inside the second short tube (333) can only be opened towards the direction away from the inside of the tube (331).

5. A composite thermally conductive PCB circuit board according to claim 4, characterized in that, The rotating cover (334b) is circular and its outer diameter is larger than the inner diameter of the ring (334a).

6. A composite thermally conductive PCB circuit board according to claim 3, characterized in that, The power assembly (336) includes: The first rotating column (336a) is rotatably connected to the inside of the groove (320). An elliptical wheel (336b) is fixed on the surface of the first rotating column (336a). The elastic component (337) applies elastic force to the movable rod (339) to make the miniature roller (338) and the elliptical wheel (336b) come into contact with each other. The second rotating column (336c) is rotatably connected to the inside of the groove (320), and the first rotating column (336a) and the second rotating column (336c) are connected by gear transmission; The third rotating column (336d) is also rotatably connected to the inside of the groove (320), and the third rotating column (336d) and the second rotating column (336c) are connected by gear transmission; The turntable (336f) is bolted to the surface of the third rotating column (336d); The blades (336e) are numerous and fixed to the surface of the turntable (336f).

7. A composite thermally conductive PCB circuit board according to claim 6, characterized in that, The blades (336e) distributed on the side of the turntable (336f) away from the second rotating column (336c) are located outside the groove (320), and the bottom of the blades (336e) is flush with the bottom of the heat-conducting plate (310).

8. A composite thermally conductive PCB circuit board according to claim 3, characterized in that, The elastic component (337) consists of a short rod (337a), a circular plate (337b), a compression spring (337c), and a sliding hole (337d). The circular plate (337b) is bolted to the surface of the movable rod (339). The short rod (337a) is fixed to the inner wall of the groove (320). The sliding hole (337d) is opened on the surface of the circular plate (337b), and the short rod (337a) is slidably connected to the inner wall of the sliding hole (337d). The two ends of the compression spring (337c) are in contact with the circular plate (337b) and the ring (334a), respectively.

9. A composite thermally conductive PCB circuit board according to claim 2, characterized in that, The heat-conducting column unit consists of a column (351), a cavity (352), and a through hole (353). There are several columns (351). The columns (351) pass through the heat-conducting plate (310) and the coil (340) in sequence. The cavity (352) is U-shaped and is opened inside the column (351). The inlet and outlet of the cavity (352) are located inside the coil (340). The through hole (353) is opened on the surface of the column (351).

10. A composite thermally conductive PCB circuit board according to claim 9, characterized in that, The column (351) is made of copper, and the length of the column (351) gradually increases towards the side away from the groove (320), and the columns (351) are staggered among each other.

Images