A central fixed heat dissipation device and electronic equipment

Abstract

This invention relates to the field of piezoelectric fan technology, and more particularly to a center-fixed heat dissipation device and electronic device. The device includes: a housing comprising an air inlet cover and an air outlet plate, with an air cavity formed between the air inlet cover and the air outlet plate; an air inlet hole on the air inlet cover and an air outlet hole on the air outlet plate; a support base fixed to the side of the air outlet plate facing the air cavity; a circular fan blade, with its center fixed to the support base; and a piezoelectric ceramic, fitted and fixed to the center of the fan blade on the side away from the support base, used to drive the vibration of the fan blade. The fan blade is configured to be center-fixed, and driven by the piezoelectric ceramic from the center to the edge to reciprocate, thereby drawing in air through the air inlet hole and compressing the air before expelling it through the air outlet hole. This invention, through its center-fixed circular structure, allows the peripheral area of ​​the fan blade to be in a free state, forming a uniformly open air inlet and outlet channel, increasing the gas inlet and outlet cross-section, and improving the airflow of the piezoelectric fan and the energy utilization rate of the piezoelectric ceramic.

Description

Technical Field

[0001] This invention relates to the field of piezoelectric fan technology, and more particularly to a centrally fixed heat dissipation device and electronic equipment. Background Technology

[0002] A piezoelectric fan is a miniature fan that uses the piezoelectric effect to drive airflow. Its core principle is that the piezoelectric material deforms under the excitation of an external electric field, which in turn drives the fan blades or other components connected to it to vibrate mechanically, thus promoting airflow and playing a role in heat dissipation or ventilation. Piezoelectric fans have advantages such as simple structure, small size, fast response and low power consumption. They are mainly used in smartphones, laptops, medical equipment and wearable devices.

[0003] In the prior art, such as Chinese utility model patent CN219865369U disclosed on October 20, 2023, a piezoelectric fan, a heat sink, and an electronic device, which includes a blower cavity whose volume changes due to piezoelectric ceramics. The blower cavity is connected to the outside through a flow channel. It also includes flexible plates disposed at both ends of the blower cavity and piezoelectric ceramics fixed on the flexible plates. The piezoelectric ceramics drive the flexible plates to vibrate along the axial direction of the blower cavity, thereby increasing or decreasing the volume inside the blower cavity, thereby enabling external airflow to be drawn into the blower cavity or discharged outside the blower cavity to dissipate heat from nearby heat sources.

[0004] However, the inventors discovered that the circular flexible plate of this type of piezoelectric fan has its edges fixed, and during operation, the stress is concentrated at the fixed edges. This structure severely reduces the amount of tensile deformation of the piezoelectric ceramics adhered to the surface of the flexible plate after being excited. Consequently, the flexible plate cannot fully utilize the energy generated by the deformation of the piezoelectric ceramics, resulting in a smaller amplitude of the flexible plate and a lower air volume of the piezoelectric fan. Summary of the Invention

[0005] In view of at least one of the above technical problems, the present invention provides a centrally fixed heat dissipation device and electronic device, which adopts structural improvements to improve the energy utilization efficiency and air volume of the piezoelectric ceramic of the piezoelectric fan.

[0006] According to a first aspect of the present invention, a center-fixed heat dissipation device is provided, comprising:

[0007] The housing includes an air inlet cover and an air outlet plate, with an air cavity formed between the air inlet cover and the air outlet plate. The air inlet cover has an air inlet hole that connects the outside to the air cavity, and the air outlet plate has an air outlet hole that connects the air cavity to the outside.

[0008] A support base is fixed on the side of the air outlet plate facing the air cavity and is located at the center of the air outlet plate;

[0009] The fan blade is circular, and the center of the fan blade is fixedly connected to the support base. The fan blade is deformable, and the height of the support base is not less than the maximum amplitude of the edge of the fan blade.

[0010] Piezoelectric ceramic is attached and fixed to the center of the fan blade on the side away from the support base, and is used to drive the vibration of the fan blade;

[0011] The fan blades are configured to be fixed at the center and driven by the piezoelectric ceramic to reciprocate from the center to the edge, so as to draw in air from the air inlet and compress the air to discharge it from the air outlet.

[0012] Furthermore, the air inlet is located at the center of the air inlet cover, the air outlet is arranged in a circumferential array on the air outlet plate, and the air outlet is located near the edge of the air outlet plate.

[0013] Furthermore, the air intake cover includes a top cover and an annular cylinder connected to the top cover at one end, and the air outlet plate is connected to the other end of the annular cylinder or the inner wall near the other end of the annular cylinder wall.

[0014] Furthermore, the air inlet of the air inlet cover has an air inlet duct extending toward the air cavity, the other end of the air inlet duct abutting against the piezoelectric ceramic or fan blade, and the side wall of the air inlet duct has an air guide channel with internal and external openings, the air guide channel is radially arranged, and the opening size on the side facing the air cavity is larger than the opening size on the side facing the inside of the air guide duct.

[0015] Furthermore, the fan blades are evenly distributed with a number of radially opened slits along the circumferential direction, and the length of the radial slits is less than the radius of the fan blades, so that the fan blades form a number of fan-shaped blades.

[0016] Furthermore, the piezoelectric ceramic is ring-shaped, and the piezoelectric ceramic is divided into fan-shaped ceramics that correspond one-to-one with the fan-shaped pieces.

[0017] Furthermore, an annular groove is provided on the side of the fan blade facing the air outlet plate. The annular groove is located near the outer edge of the fan blade and is positioned opposite to the air outlet.

[0018] Furthermore, reinforcing ribs are evenly distributed along the circumference inside the annular groove. The reinforcing ribs are arranged radially and start from the outer wall of the annular groove and extend toward the center.

[0019] Furthermore, both the piezoelectric ceramic and the fan blade are arranged in a ring shape and are coaxially aligned. A connecting post or a connecting piece covering both sides of the hollow space is connected between them. The connecting post or one of the connecting pieces is fixedly connected to the support base.

[0020] Furthermore, the support base has a sheet-like or columnar structure, and the columnar structure is a straight column, a frustum-shaped structure that is thicker at the top and thinner at the bottom, a bowl-shaped structure, or an inverted T-shaped structure in the axial section;

[0021] According to a second aspect of the invention, an electronic device is also provided, comprising a centrally fixed heat dissipation device as described in any one of the first aspects.

[0022] The beneficial effects of the present invention are as follows: The present invention fixes the center position of the fan blade by supporting the base, thereby releasing the degree of freedom around the fan blade. Compared with the prior art, under the same excitation conditions, the amplitude of the fan blade can be increased by 2 to 3 times, thereby increasing the gas inlet and outlet volume and the air volume. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the centrally fixed heat dissipation device in an embodiment of the present invention;

[0025] Figure 2 As described in the embodiments of the present invention Figure 1 Sectional view along line AA in the middle;

[0026] Figure 3 This is a schematic diagram of the exploded structure of the centrally fixed heat dissipation device in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the amplitude simulation structure of edge-fixed fan blades in the existing technology;

[0028] Figure 5 This is a simulation diagram of the amplitude of the fan blades of the centrally fixed heat dissipation device in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of another air intake cover in an embodiment of the present invention;

[0030] Figure 7 As described in the embodiments of the present invention Figure 6 Schematic diagram of the BB-direction cross-section structure in the middle;

[0031] Figure 8 This is a schematic diagram of the structure of a fan blade and piezoelectric ceramic in an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of another fan blade and piezoelectric ceramic structure in an embodiment of the present invention;

[0033] Figure 10 This is a market constraint for one structure of the fan blade in an embodiment of the present invention;

[0034] Figure 11 As described in the embodiments of the present invention Figure 2 A magnified schematic diagram of the structure at point C in the diagram;

[0035] Figure 12 This is a schematic diagram of the explosive decomposition of the hollow piezoelectric ceramic, the fan blade, and the connecting column in an embodiment of the present invention;

[0036] Figure 13 This is a schematic diagram of the explosive decomposition of the hollow piezoelectric ceramic, the fan blade, and the connecting piece in an embodiment of the present invention;

[0037] Figure 14 This is a schematic diagram of the connection structure between the sheet-like support base and the fan blade in an embodiment of the present invention;

[0038] Figure 15 This is a simulation diagram of the maximum amplitude of the fan-shaped support edge in an embodiment of the present invention;

[0039] Figure 16 This is a schematic diagram of the connection structure between the straight column support base and the fan blade in an embodiment of the present invention;

[0040] Figure 17 This is a simulation diagram of the maximum amplitude of the fan blade edge of the straight column support in an embodiment of the present invention;

[0041] Figure 18 This is a schematic diagram of the connection structure between the frustum-shaped support and the fan blade in an embodiment of the present invention;

[0042] Figure 19 This is a simulation diagram of the maximum amplitude of the fan-shaped support edge in an embodiment of the present invention;

[0043] Figure 20 This is a schematic diagram of the connection structure between the bowl-shaped support and the fan blade in an embodiment of the present invention;

[0044] Figure 21 This is a simulation diagram of the maximum amplitude of the fan-shaped support edge in an embodiment of the present invention;

[0045] Figure 22 This is a schematic diagram of the connection structure between the inverted T-shaped support and the fan blade in an embodiment of the present invention;

[0046] Figure 23 This is a simulation diagram of the maximum amplitude of the fan blade edge of the inverted T-shaped support in an embodiment of the present invention.

[0047] Explanation of reference numerals in the attached drawings: 1. Shell; 11. Air inlet cover; 111. Air inlet hole; 11a. Top cover; 11b. Annular cylinder; 112. Air inlet duct; 112a. Air guide channel; 12. Air outlet plate; 121. Air outlet hole; 13. Air cavity; 2. Support base; 3. Fan blade; 31. Radial slot; 32. Fan-shaped blade; 33. Annular groove; 34. Reinforcing rib; 4. Piezoelectric ceramic; 41. Fan-shaped ceramic; 42. Connecting column; 43. Connecting piece. Detailed Implementation

[0048] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0049] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0051] like Figures 1 to 3 The center-fixed heat dissipation device shown includes a housing 1, a support base 2, fan fins 3, and piezoelectric ceramic 4. Please refer to [reference needed] for details. Figure 2 and Figure 3 In an embodiment of the present invention, the housing 1 includes an air inlet cover 11 and an air outlet plate 12, forming an air cavity 13. The air inlet cover 11 has an air inlet hole 111 communicating with the outside and the air cavity 13, and the air outlet plate 12 has an air outlet hole 121 communicating with the air cavity 13 and the outside. The secret cavity formed between the air inlet cover 11 and the air outlet plate 12 provides a vibration space for the fan blades 3. In an embodiment of the present invention, as shown... Figure 2 and 3As shown, the support base 2 is fixed on the side of the air outlet plate 12 facing the air cavity 13 and is located at the center of the air outlet plate 12; the fan blade 3 is circular and the center of the fan blade 3 is fixed to the support base 2. The fan blade 3 is deformable and the height of the support base 2 is not less than the maximum amplitude of the edge of the fan blade 3; the piezoelectric ceramic 4 is attached and fixed to the center of the side of the fan blade 3 away from the support base 2 and is used to drive the vibration of the fan blade 3.

[0052] In an embodiment of the present invention, the fan blade 3 is configured to be fixed at the center and driven by the piezoelectric ceramic 4 to reciprocate from the center to the edge, so as to draw in air from the air inlet 111 and compress the air to discharge it from the air outlet 121. That is, driven by the piezoelectric ceramic 4, when the fan blade 3 is pressed down, outside air enters into the air chamber 13 through the air inlet 111, and the air between the fan blade 3 and the air outlet plate 12 is compressed and discharged through the air outlet 121. Through the continuous reciprocating motion of the fan blade 3, air is continuously drawn into the air chamber 13 from the air inlet 111 and then discharged from the air outlet 121, thereby realizing heat exchange near the heat source, that is, taking away the hot air and bringing in the cold air.

[0053] Please refer to the details. Figure 4 and Figure 5 Under the same excitation conditions and structural dimensions, simulation comparisons show that the maximum amplitude of the circular structure with fixed edges is ±18 µm. In contrast, the amplitude of the fan blade 3 with a fixed center structure can reach ±45 µm, more than twice that of the former, thus effectively improving the airflow efficiency. In the above embodiment, the center position of the fan blade 3 is fixed by the support base 2, thereby releasing the degrees of freedom around the fan blade 3. Compared with the prior art, under the same excitation conditions, the amplitude of the fan blade 3 can be increased by 2 to 3 times, thereby increasing the gas inlet and outlet volume and the airflow.

[0054] Based on the above embodiments, in some embodiments of the present invention, such as Figure 3 As shown, the air inlet 111 is located at the center of the air inlet cover 11, and the air outlets 121 are arranged in a circumferential array on the air outlet plate 12, with the air outlets 121 located near the edge of the air outlet plate 12. By placing the air inlet 111 at the center, the air flow is made smoother, and the air entry stroke is lengthened to the maximum extent, thereby reducing air leakage when the fan blades 3 flip up.

[0055] In some embodiments of the present invention, the specific structure of the housing 1 is as follows: Figure 2 and Figure 6As shown, the air intake cover 11 includes a top cover 11a and an annular cylinder 11b connected to the top cover 11a at one end. The air outlet plate 12 is connected to the other end of the annular cylinder 11b or the inner wall near the other end of the annular cylinder 11b. That is, in the embodiment of the present invention, the air intake cover 11 has an inverted barrel-shaped structure. With this structural form, the connection between the air outlet plate 12 and the annular cylinder 11b can form an air cavity 13 structure. Of course, it should be noted that the air intake cover 11 can be set at the top or at the bottom, and those skilled in the art can set it as needed.

[0056] Please continue to refer to Figure 6 In some embodiments of the present invention, to further suppress gas overflow, the air inlet cover 11 has an air inlet duct 112 extending toward the air chamber 13 at the air inlet hole 111. In some embodiments of the present invention, the inner diameter of the air inlet duct 112 is not smaller than the air inlet hole 111. The other end of the air inlet duct 112 abuts against the piezoelectric ceramic 4 or the fan blade 3. The side wall of the air inlet duct 112 has an air guide channel 112a that is open inside and out. With this arrangement, outside air first enters into the air inlet duct 112 from the outside in the axial direction, and then enters into the air chamber 13 through the air guide channel 112a provided on the air inlet duct 112. Since the cross-sectional area of ​​the air guide channel 112a provided on the air inlet duct 112 is relatively small, it can increase the resistance to gas overflow from the air inlet duct 112 to a certain extent, thereby reducing gas overflow. In addition, please refer to Figure 6 and Figure 7 In an embodiment of the present invention, the air guide channel 112a is radially arranged, and the opening size on the side facing the air cavity 13 is larger than the opening size on the side facing the inner side of the air guide duct. For example... Figure 7 As shown in the embodiment of the present invention, the flow direction of the air guide channel 112a is perpendicular to the axial direction of the air inlet duct 112, thereby causing the gas to change direction by 90 degrees after entering the air inlet duct 112. This directional improvement can increase the resistance to gas overflow. In addition, the air guide channel 112a is narrow inside and wide outside, i.e. Figure 7 The fan-shaped structure shown further increases the resistance to gas overflow. This structural design allows more air to be compressed and discharged, thereby increasing the air volume of the piezoelectric fan.

[0057] Please refer to Figure 8 In an embodiment of the present invention, in order to further increase the vibration amplitude of the fan blade 3 edge, the fan blade 3 is provided with a plurality of radially opened radial slots 31 evenly distributed along the circumferential direction. The length of the radial slots 31 is less than the radius of the fan blade 3, so that the fan blade 3 forms a plurality of fan-shaped blades 32. By opening the radial slots 31, the resistance of the fan blade 3 during vibration can be further reduced, and the overall rigidity of the fan blade 3 during edge-slapping fanning can also be reduced, thereby allowing the amplitude of the fan blade 3 to be further increased.

[0058] Based on the above embodiments, when the circular piezoelectric ceramic 4 contracts, the surrounding area contracts towards the center, causing stress concentration at the center. This concentrated stress hinders the deformation of the piezoelectric ceramic 4, resulting in energy loss. In the embodiments of the present invention, such as... Figure 9 As shown in the figure, the piezoelectric ceramic 4 is ring-shaped and divided into fan-shaped ceramics 41 that correspond one-to-one with the fan-shaped plates 32. The ring-shaped structure makes the piezoelectric ceramic 4 hollow in the middle. With this structure, the stress in the middle is no longer concentrated, which can maximize the deformation of the piezoelectric ceramic 4 and further improve the vibration of the fan plates 32.

[0059] Please continue to refer to Figure 10 and Figure 11 In an embodiment of the present invention, to further increase the air volume, an annular groove 33 is provided on the side of the fan blade 3 facing the air outlet plate 12. The annular groove 33 is located near the outer edge of the fan blade 3 and is positioned opposite to the air outlet 121. The annular groove 33 increases the volume within the air cavity 13, and the structure of the annular groove 33 being positioned opposite to the air outlet 121 allows more air to be forced into the air outlet 121, reducing gas leakage. Furthermore, the annular groove 33 weakens the rigidity of the edge of the fan blade 3, thereby further increasing the oscillation amplitude of the fan blade 3. It should be noted that in an embodiment of the present invention, the air outlet 121 being positioned opposite to the annular groove 33 means that the air outlet 121 is also arranged in a circular pattern and positioned directly opposite the annular groove 33. It can be positioned in the middle of the annular groove 33, or as shown in the diagram. Figure 11 The annular groove 33 is positioned on both sides as shown in the diagram. This structural design allows for the compression and discharge of more gas.

[0060] Please continue to refer to Figure 10 In an embodiment of the present invention, reinforcing ribs 34 are evenly distributed along the circumferential direction within the annular groove 33. The reinforcing ribs 34 are radially arranged, starting from the outer wall of the annular groove 33 and extending towards the center. By providing the reinforcing ribs 34, the fan blades 3 can be prevented from turning outward at the annular groove 33, thereby reducing gas leakage.

[0061] Please refer to Figure 12 and Figure 13In the embodiments of the present invention, both the piezoelectric ceramic 4 and the fan-shaped plate 3 are arranged in a ring shape and are coaxially aligned. A connecting post 42 or a connecting piece 43 covering both sides of the hollow portion is connected between them. The connecting post 42 or one of the connecting pieces 43 is fixedly connected to the support base 2. It should be noted that the term "hollow" here also includes the fan-shaped plate 32 structure mentioned above. The specific beneficial effects have been described in detail above and will not be repeated here.

[0062] In embodiments of the present invention, the specific structural form of the support base 22 is varied, for example, the support base 2 is shaped as follows: Figure 14 The sheet-like structure shown, such as Figure 15 The figure shown is a simulation diagram of the maximum amplitude of the edge of the fan blade 3 connected to it;

[0063] In embodiments of the present invention, the support base 2 can also be a columnar structure, specifically as follows: Figure 16 The straight columnar structure shown in the figure Figure 17 This is a simulation diagram of the maximum amplitude at the edge of the fan blade 3 connected to it; it can also be as follows: Figure 18 The frustum-shaped structure shown is thicker at the top and thinner at the bottom. Figure 19 This is a simulation diagram of the maximum amplitude of the edge of the fan blade 3 connected to it; it can also be as follows: Figure 20 The bowl-shaped structure shown here is also thicker at the top and thinner at the bottom, but with a curved wall in the middle for a smooth transition. Figure 21 This is a simulation diagram of the maximum amplitude of the edge of the fan blade 3 connected to it; it can also be as follows: Figure 22 The axial cross-section shown is an inverted T-shaped structure. Figure 23 This is a simulation diagram of the maximum amplitude of the edge of the fan blade 3 connected to it; by comparison, it can be found that the plate-shaped support base has a simple structure, high support strength, and an amplitude of ±60 µm; the frustum-shaped support base, through the transition design of the edge flexible gradient, is conducive to the fan blade forming a continuous vibration mode, and the maximum amplitude is also close to ±60 µm.

[0064] In an embodiment of the present invention, an electronic device is also provided, which includes the aforementioned centrally fixed heat dissipation device. It should be noted that the electronic device can be a mobile phone, tablet, laptop, wearable device, medical device, etc. During installation, the centrally fixed heat dissipation device is positioned near a heat source, such as a CPU, GPU, or other processors that generate significant heat, or a power supply. The fan blades 3 are used to circulate air, thereby achieving the effect of expelling hot air and blowing in cool air.

[0065] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A central fixed heat dissipating device, characterized in that, include: The housing includes an air inlet cover and an air outlet plate, with an air cavity formed between the air inlet cover and the air outlet plate. The air inlet cover has an air inlet hole that connects the outside to the air cavity, and the air outlet plate has an air outlet hole that connects the air cavity to the outside. A support base is fixed on the side of the air outlet plate facing the air cavity and is located at the center of the air outlet plate; The fan blade is circular, and the center of the fan blade is fixedly connected to the support base. The fan blade is deformable, and the height of the support base is not less than the maximum amplitude of the edge of the fan blade. Piezoelectric ceramic is attached and fixed to the center of the fan blade on the side away from the support base, and is used to drive the vibration of the fan blade; The air intake cover includes a top cover and an annular cylinder connected to the top cover at one end. The air outlet plate is connected to the inner wall of the other end of the annular cylinder or near the other end of the annular cylinder wall. The air inlet cover has an air inlet duct extending toward the air cavity at the air inlet hole. The other end of the air inlet duct abuts against the piezoelectric ceramic or fan blade. The side wall of the air inlet duct has an air guide channel that is open inside and out. The air guide channel is radially arranged, and the opening size on the side facing the air cavity is larger than the opening size on the side facing the inside of the air inlet duct. The fan blades are configured to be fixed at the center and driven by the piezoelectric ceramic to reciprocate from the center to the edge, so as to draw in air from the air inlet and compress the air to discharge it from the air outlet.

2. The centrally fixed heat dissipation device according to claim 1, characterized in that, The air inlet is located at the center of the air inlet cover, and the air outlets are arranged in a circumferential array on the air outlet plate, with the air outlets located near the edge of the air outlet plate.

3. The centrally fixed heat dissipation device according to claim 1, characterized in that, The fan blades have several radially opened slits evenly distributed along the circumference, and the length of the radial slits is less than the radius of the fan blades, so that the fan blades form several fan-shaped pieces.

4. The centrally fixed heat dissipation device according to claim 3, characterized in that, The piezoelectric ceramic is ring-shaped and is divided into sector ceramics that correspond one-to-one with the sector-shaped pieces.

5. The centrally fixed heat dissipation device according to claim 1, characterized in that, An annular groove is also provided on the side of the fan blade facing the air outlet plate. The annular groove is located near the outer edge of the fan blade and is positioned opposite to the air outlet.

6. The centrally fixed heat dissipation device according to claim 5, characterized in that, The annular groove is also provided with reinforcing ribs evenly distributed along the circumference. The reinforcing ribs are arranged radially and start from the outer wall of the annular groove and extend toward the center.

7. The center-fixed heat dissipation device according to claim 1, 3, or 5, characterized in that, Both the piezoelectric ceramic and the fan blade are arranged in a ring shape and are coaxially aligned. A connecting post or a connecting piece covering both sides of the hollow space is connected between them. The connecting post or one of the connecting pieces is fixedly connected to the support base.

8. The central fixed heat dissipating device according to claim 1, characterized in that, the support seat is in a sheet shape or a column shape, the column shape being a straight column shape, a circular truncated cone shape with a wide upper part and a narrow lower part, a bowl shape, or an inverted T-shaped structure in axial cross section.

9. An electronic device, comprising: The central fixed heat dissipating device according to any one of claims 1 to 8.

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