Electromagnetically-driven efficient heat dissipation equipment

Abstract

The utility model relates to the technical field of heat dissipation of electronic equipment, in particular to electromagnetic-driven efficient heat dissipation equipment, which comprises a base, a vibrating plate, a driving assembly and a magnetic cover cap, the vibrating plate divides a cavity formed by the base and the magnetic cover cap into a first air chamber and a second air chamber, and the first air chamber and the second air chamber are communicated with each other. An air outlet hole and an air inlet hole are formed in the base and the magnetic cover respectively; fan blades are arranged on the vibration plate, the driving assembly is arranged in the cavity and comprises magnetic steel, a flexible circuit board and a coil electrically connected with the flexible circuit board, the coil is arranged on the fan blades, and the magnetic steel is arranged on the magnetic cover cap and arranged on the inner ring of the magnetic cover cap corresponding to the coil. According to the scheme, the structural design of the piezoelectric fan can continue to be used, the driving mode of the fan blades is converted into electromagnetic driving from piezoelectric driving, based on the electromagnetic induction principle, the voice coil, the magnetic steel, the fan blades, the air outlet plate and other multi-layer assemblies are combined, large-amplitude driving of the fan blades to vibrate under low voltage is achieved, and therefore the air outlet amount and the heat dissipation efficiency of the heat dissipation equipment are improved.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation technology for electronic devices, and in particular to an electromagnetically driven high-efficiency heat dissipation device. Background Technology

[0002] Against the backdrop of rapid iteration in 5G communication and microelectronics technology, mobile terminal devices are continuously evolving towards higher integration and miniaturization, and their heat dissipation requirements are also increasing. Piezoelectric-driven ultrathin fans, as the current mainstream active heat dissipation devices, achieve fan blade vibration through the inverse piezoelectric effect, and have the characteristics of short response time and low power consumption. However, due to limitations in material physical properties and driving principles, piezoelectric fans suffer from problems such as excessively high driving voltage, easy fatigue of piezoelectric ceramics, and low airflow due to small amplitude, resulting in unsatisfactory heat dissipation effects.

[0003] Therefore, this invention proposes a novel ultra-thin fan based on electromagnetic drive, aiming to improve the overall performance of the fan by optimizing the drive method. Utility Model Content

[0004] This invention provides an electromagnetically driven high-efficiency heat dissipation device, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An electromagnetically driven high-efficiency heat dissipation device includes a base and a vibrating plate, a driving assembly and a magnetic cover disposed thereon. The vibrating plate divides the cavity formed by the base and the magnetic cover into a first air chamber and a second air chamber that are interconnected. An air outlet and an air inlet are respectively provided on the base and the magnetic cover.

[0007] A fan blade is provided on the vibrating plate, and the driving assembly is provided in the cavity, including a magnet, a flexible circuit board and a coil electrically connected thereto. The coil is provided on the fan blade, and the magnet is provided on the magnetic cover and is arranged in its inner ring corresponding to the coil.

[0008] Furthermore, the base includes a base plate and a jet plate disposed thereon, a first groove is provided on the side of the jet plate facing the vibrating plate, a through hole is provided in the first groove, and a guide groove is provided on the base plate.

[0009] The first groove, together with the vibrating plate, forms the second air chamber. The fan blade is correspondingly arranged with the first groove. The guide groove is connected to the second air chamber through the through hole and extends to the edge of the bottom plate to form the air outlet with the edge of the jet plate.

[0010] Furthermore, multiple through holes are evenly arranged along the length of the guide groove.

[0011] Furthermore, a second groove is provided on the side of the fan blade facing the jet plate, the second groove is provided corresponding to the through hole, and the air inlet is offset from the fan blade.

[0012] Furthermore, two fan blades are symmetrically arranged on the vibrating plate. The fan blades are embedded in the vibrating plate, and a U-shaped slot is formed between the fan blades and the vibrating plate. The first air chamber communicates with the second air chamber through the U-shaped slot.

[0013] Furthermore, an installation groove is provided on the vibrating plate between the two fan blades, the installation groove extending along the axis of symmetry of the two fan blades to both sides of the vibrating plate, and the flexible circuit board is disposed in the installation groove.

[0014] Furthermore, the air inlet is located between the two fan blades and extends along the length of the axis of symmetry of the two fan blades.

[0015] Furthermore, multiple air inlets are provided along the symmetrical axis of the two fan blades.

[0016] Furthermore, the two coils on the two fan blades are symmetrically arranged, and the magnets are symmetrically arranged on both sides of the air inlet.

[0017] Furthermore, a third groove is provided on the side of the fan blade near the mounting groove, and multiple third grooves are provided along the length direction of the mounting groove.

[0018] The beneficial effects of this utility model are as follows:

[0019] This application solution can adopt the structural design of a piezoelectric fan, but converts the driving method of the fan blades from piezoelectric drive to electromagnetic drive. Based on the principle of electromagnetic induction, it combines multiple components such as voice coil, magnet, fan blades and air outlet plate to achieve low voltage and large amplitude, thereby improving the air volume and heat dissipation efficiency of the heat dissipation equipment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the electromagnetically driven high-efficiency heat dissipation device in this utility model;

[0022] Figure 2This is a top view of the electromagnetically driven high-efficiency heat dissipation device in this utility model;

[0023] Figure 3 This is a bottom view of the structure of the electromagnetically driven high-efficiency heat dissipation device in this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the vibrating plate and its upper driving assembly in this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the bottom plate and the upper jet plate of this utility model;

[0026] Figure 6 This is a cross-sectional structural diagram of the electromagnetically driven high-efficiency heat dissipation device of this utility model.

[0027] Reference numerals: 1. Base; 11. Air outlet; 12. Base plate; 121. Guide groove; 13. Jet plate; 131. First groove; 132. Through hole; 2. Vibrating plate; 21. Fan blade; 22. Second groove; 23. U-shaped slot; 24. Mounting groove; 25. Third groove; 3. Drive assembly; 31. Magnet; 32. Flexible circuit board; 33. Coil; 4. Magnetic cover; 41. Air inlet; 5. Cavity; 51. First air chamber; 52. Second air chamber. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0029] 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.

[0030] 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 herein 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.

[0031] Currently, piezoelectric fans used in electronic devices typically require high driving voltages (80-120Vpp) to generate sufficient amplitude and achieve the desired airflow. This increases the power consumption and power requirements of the electronic devices, and limits their application range. This application, based on the principle of electromagnetic induction, combines the interaction between a voice coil and a magnet 31 to convert electrical signals into mechanical vibrations, thereby driving airflow.

[0032] Specifically, such as Figures 1 to 6 The electromagnetically driven high-efficiency heat dissipation device shown includes a base 1 and a vibrating plate 2, a drive assembly 3, and a magnetic cover 4 disposed thereon. The vibrating plate 2 divides the cavity 5 formed by the base 1 and the magnetic cover 4 into a first air chamber 51 and a second air chamber 52 that are interconnected. An air outlet 11 and an air inlet 41 are respectively provided on the base 1 and the magnetic cover 4. A fan blade 21 is provided on the vibrating plate 2. The drive assembly 3 is disposed in the cavity 5 and includes a magnet 31, a flexible circuit board 32, and a coil 33 electrically connected thereto. The coil 33 is disposed on the fan blade 21, the magnet 31 is disposed on the magnetic cover 4, and the coil 33 is disposed in its inner ring.

[0033] In the specific implementation process, the heat dissipation device receives an electrical signal and drives the fan blade 21 on the vibrating plate 2 to vibrate, causing the gas in the first air chamber 51 to flow to the second air chamber 52, pushing the air inlet 41 to draw in air, and expelling the gas from the air outlet 11; wherein, the coil 33 is made of copper wire and placed in the constant magnetic field generated by the magnet 31, and receives alternating current from an external power source through the flexible circuit board 32. When the current passes through the coil 33, according to Ampere's law, the current in the coil 33 and the magnetic field will interact, causing the coil 33 to be subjected to a force perpendicular to the current and the magnetic field, thereby pushing the coil 33 to vibrate up and down in the magnetic field; and the coil 33 is fixedly connected to the fan blade 21. When the coil 33 vibrates, it will further transmit the vibration to the fan blade 21, thereby pushing the fan blade 21 to vibrate up and down, causing the air in the cavity 5 to start flowing, and pushing the airflow out from the air outlet 11.

[0034] Among them, the drive component 3 receives an electrical signal from an external power source. This alternating current represents the frequency and intensity of the electrical signal. The frequency of the electrical signal determines the vibration frequency of the fan blade 21, while the intensity of the current determines the amplitude of the fan blade 21.

[0035] The proposed solution can adopt the structural design of a piezoelectric fan, but the driving method of the fan blade 21 is changed from piezoelectric drive to electromagnetic drive. Currently, due to the limitations of the physical properties of piezoelectric ceramics, the amplitude of the driven fan blades in the current piezoelectric fan structure is mostly between 10-100 micrometers, resulting in a low air volume. Dielectric breakdown and stress concentration occur at the junction of the piezoelectric ceramic and the metal substrate under a voltage of 80-120Vpp.

[0036] The electromagnetically driven high-efficiency heat dissipation device disclosed in this application only requires the application of a low-voltage alternating current (1-5Vpp). When the current passes through the coil 33, it generates an alternating magnetic field. Under the interaction between the alternating magnetic field and the magnet 31 on the magnetic cover 4, the coil 33 vibrates, which in turn drives the fan blades 21 on the vibrating plate 2 to vibrate, causing the gas around the fan blades to be disturbed. This causes the gas near the heat source to be discharged from the air outlet 11, thus achieving the purpose of heat dissipation.

[0037] Theoretical calculations show that, under the same power consumption (input power 1W), the driving force output by electromagnetic drive (0.48N) is at least four times that of piezoelectric drive (0.12N), and the amplitude can reach 500 micrometers. Therefore, compared with piezoelectric drive fans, electromagnetic drive fans have a significantly larger air volume and a significant heat dissipation advantage.

[0038] In this embodiment, as Figure 2 and Figure 5 As shown, the base 1 includes a base plate 12 and a jet plate 13 disposed thereon. A first groove 131 is provided on the side of the jet plate 13 facing the vibrating plate 2. A through hole 132 is provided in the first groove 131. A guide groove 121 is provided on the base plate 12. The first groove 131 cooperates with the vibrating plate 2 to form a second air chamber 52. The fan blade 21 is correspondingly disposed with the first groove 131. The guide groove 121 is connected to the second air chamber 52 through the through hole 132 and extends to the edge of the base plate 12 to cooperate with the edge of the jet plate 13 to form an air outlet 11.

[0039] Multiple through holes 132 are evenly arranged along the length of the guide groove 121. A second groove 22 is provided on the side of the fan blade 21 facing the jet plate 13, and the second groove 22 is corresponding to the through holes 132. The air inlet 41 is offset from the fan blade 21.

[0040] When the fan blade 21 is pressed down, the first air chamber 51 forms a low-pressure zone, allowing gas to be drawn in through the air inlet 41. The airflow in the second air chamber 52 flows into the guide groove 121 through the through hole 132, and after being accelerated by the guide groove 121, it is discharged from the air outlet 11, forming a fixed jet. There is a height difference between the edge of the second groove 22 on the fan blade 21 and the plane of the fan blade 21, which increases the reverse flow path of the gas from the through hole 132 to the U-shaped groove. The design of the second groove 22 will cause the airflow to form a local vortex in the second groove 22 when it attempts to flow back into the first air chamber 51 from the second air chamber 52. The vortex energy dissipation reduces the backflow speed. The misalignment of the air inlet 41 and the fan blade 21 can also further prevent gas backflow.

[0041] In this embodiment, two fan blades 21 are symmetrically arranged on the vibrating plate 2. The fan blades 21 are embedded in the vibrating plate 2, and a U-shaped slot 23 is formed between the fan blades 21 and the vibrating plate 2. The first air chamber 51 is connected to the second air chamber 52 through the U-shaped slot 23. Two coils 33 on the two fan blades 21 are symmetrically arranged, and magnets 31 are symmetrically arranged on both sides of the air inlet 41. The symmetrical distribution of the coils 33 on both sides of the magnets 31 of the two fan blades 21 counteracts the vibration inertial torque and reduces the risk of structural resonance.

[0042] Furthermore, a mounting groove 24 is provided on the vibrating plate 2 between the two blades 21. The mounting groove 24 extends along the axis of symmetry of the two blades 21 to both sides of the vibrating plate 2, and the flexible circuit board 32 is disposed within the mounting groove 24. A third groove 25 is provided on the side of the blade 21 near the mounting groove 24, and multiple third grooves 25 are provided along the length of the mounting groove 24. The third grooves 25 are evenly distributed along the length of the mounting groove 24, thereby improving the vibration degree of freedom of the blade 21 by weakening the local stiffness.

[0043] The air inlet 41 is located between the two blades 21 and extends along the length of the axis of symmetry of the two blades 21. Multiple air inlets 41 are provided along the axis of symmetry of the two blades 21. The air inlet 41 is staggered from the two blades 21, increasing the path for gas in the second air chamber 52 to flow back through the first air chamber 51 to the air inlet 41, further preventing backflow.

[0044] The electromagnetically driven high-efficiency heat dissipation device disclosed in this application utilizes electromagnetic drive to improve product lifespan and reduce manufacturing costs. Compared to the short lifespan of piezoelectric driven fans, which stems from the triple coupling effect of intrinsic material fatigue, high-voltage heat loss, and mechanical stress concentration, the electromagnetic drive solution extends fan lifespan by eliminating piezoelectric material deformation (no mechanically deformable parts and pure electromagnetic drive) and reducing drive voltage. Furthermore, it avoids the use of high-cost piezoelectric ceramic materials and special adhesives, making the fan's manufacturing cost more competitive.

[0045] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An electromagnetically driven high-efficiency heat dissipation device, characterized in that, It includes a base (1) and a vibrating plate (2), a drive assembly (3) and a magnetic cover (4) disposed thereon. The vibrating plate (2) divides the cavity (5) formed by the base (1) and the magnetic cover (4) into a first air chamber (51) and a second air chamber (52) that are interconnected. An air outlet (11) and an air inlet (41) are respectively provided on the base (1) and the magnetic cover (4). A fan blade (21) is provided on the vibrating plate (2). The driving assembly (3) is provided in the cavity (5) and includes a magnet (31), a flexible circuit board (32) and a coil (33) electrically connected thereto. The coil (33) is provided on the fan blade (21), and the magnet (31) is provided on the magnetic cover (4) and is provided in its inner ring corresponding to the coil (33).

2. The electromagnetically driven high-efficiency heat dissipation device according to claim 1, characterized in that, The base (1) includes a base plate (12) and a jet plate (13) disposed thereon. A first groove (131) is provided on the side of the jet plate (13) facing the vibrating plate (2). A through hole (132) is provided in the first groove (131). A guide groove (121) is provided on the base plate (12). The first groove (131) cooperates with the vibrating plate (2) to form the second air chamber (52). The fan blade (21) is correspondingly arranged with the first groove (131). The guide groove (121) is connected to the second air chamber (52) through the through hole (132) and extends to the edge of the bottom plate (12) to cooperate with the edge of the jet plate (13) to form the air outlet (11).

3. The electromagnetically driven high-efficiency heat dissipation device according to claim 2, characterized in that, Multiple through holes (132) are uniformly arranged along the length of the guide groove (121).

4. The electromagnetically driven high-efficiency heat dissipation device according to claim 2, characterized in that, A second groove (22) is provided on the side of the fan blade (21) facing the jet plate (13), the second groove (22) is provided corresponding to the through hole (132), and the air inlet (41) is offset from the fan blade (21).

5. The electromagnetically driven high-efficiency heat dissipation device according to any one of claims 2 to 4, characterized in that, Two fan blades (21) are symmetrically arranged on the vibrating plate (2). The fan blades (21) are embedded in the vibrating plate (2), and a U-shaped slot (23) is formed between the fan blades (21) and the vibrating plate (2). The first air chamber (51) is connected to the second air chamber (52) through the U-shaped slot (23).

6. The electromagnetically driven high-efficiency heat dissipation device according to claim 5, characterized in that, An installation groove (24) is provided on the vibration plate (2) between the two fan blades (21). The installation groove (24) extends along the axis of symmetry of the two fan blades (21) to the two sides of the vibration plate (2). The flexible circuit board (32) is disposed in the installation groove (24).

7. The electromagnetically driven high-efficiency heat dissipation device according to claim 5, characterized in that, The air inlet (41) is located between the two fan blades (21) and extends along the length of the axis of symmetry of the two fan blades (21).

8. The electromagnetically driven high-efficiency heat dissipation device according to claim 7, characterized in that, The air inlet (41) has multiple holes arranged along the axis of symmetry of the two fan blades (21).

9. The electromagnetically driven high-efficiency heat dissipation device according to claim 7, characterized in that, The two coils (33) on the two fan blades (21) are symmetrically arranged, and the magnets (31) are symmetrically arranged on both sides of the air inlet (41).

10. The electromagnetically driven high-efficiency heat dissipation device according to claim 6, characterized in that, A third groove (25) is provided on the side of the fan blade (21) near the mounting groove (24), and multiple third grooves (25) are provided along the length direction of the mounting groove (24).

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