WO2021121181A1

WO2021121181A1 - Heat dissipation apparatus and electronic device

Info

Publication number: WO2021121181A1
Application number: PCT/CN2020/136078
Authority: WO
Inventors: 陈蓬勃; 宋功发
Original assignee: 维沃移动通信有限公司
Priority date: 2019-12-20
Filing date: 2020-12-14
Publication date: 2021-06-24
Also published as: CN110933918B; CN110933918A

Abstract

Disclosed are a heat dissipation apparatus and an electronic device. The heat dissipation apparatus comprises: a first magnetic member; a swing assembly, wherein the swing assembly comprises a base and a vane, and a first end of the vane is connected to the base, and a second end of the vane is suspended; and a second magnetic member, wherein the second magnetic member is arranged on the vane and is adjacent to the second end of the vane; the first magnetic member and the second magnetic member are oppositely disposed at an interval; and the magnetism of at least one of the first magnetic member and the second magnetic member is changeable, such that the second end of the vane swings under the magnetic action of the first magnetic member and the second magnetic member.

Description

Heat sink and electronic equipment

Cross-references to related applications

This application claims the priority of Chinese Patent Application No. 201911329060.7 filed in China on December 20, 2019, the entire content of which is incorporated herein by reference.

Technical field

The present invention relates to the field of heat dissipation technology, in particular to a heat dissipation device and electronic equipment.

Background technique

With the continuous development of science and technology, people have higher and higher requirements for the performance of electronic devices, resulting in increasing power consumption of the entire electronic device. Therefore, it is necessary to propose a more efficient heat dissipation improvement plan.

Nowadays, the natural heat dissipation method is commonly used. This kind of heat dissipation method has extremely limited capacity and is far from meeting the heat dissipation requirements of electronic devices. In order to solve this problem, a small fan can be installed inside the electronic device, and air cooling can be used to dissipate heat.

However, during the operation of the fan, the fan blade rotates around the bearing, and friction is generated between the components, which causes severe wear of the bearing and reduces the reliability of the heat sink. At the same time, external impurities enter the gap between the fan blade and the bearing, and the fan may be blocked, causing the fan to stop working. Long-term blocking may cause the fan to heat and burn and shorten the service life of the heat sink.

Summary of the invention

The invention discloses a heat dissipation device and electronic equipment to solve the problems of low reliability and short service life of the heat dissipation device.

In order to solve the above problems, the present invention adopts the following technical solutions:

A heat dissipation device, including:

The first magnetic piece;

A swing assembly, the swing assembly includes a base and a blade, a first end of the blade is connected to the base, and a second end of the blade is suspended;

A second magnetic member, the second magnetic member is disposed on the blade and adjacent to the second end of the blade;

The first magnetic member and the second magnetic member are arranged at intervals and opposite to each other. The magnetic properties of at least one of the first magnetic member and the second magnetic member are variable, so that the first magnetic member The second end of the blade swings under the action of the magnetic force of the second magnetic member and the second magnetic member.

An electronic device includes a heating device and the above-mentioned heat dissipation device, and the blade of the heat dissipation device is arranged adjacent to the heating device.

The technical scheme adopted by the present invention can achieve the following beneficial effects:

In the heat dissipating device disclosed in the present invention, under the magnetic force of the first magnetic member and the second magnetic member, the blade swings out of the wind, which replaces the way the fan rotates around the bearing, and eliminates the friction caused by the relative rotation of the fan blades and the bearing. The bearing wear problem has improved the reliability of the heat sink. In addition, the blade swings out of the wind. There are no relatively rotating parts, so there is no gap between the relatively rotating parts. External impurities will not affect the swing of the blades, so there will be no locked rotor. The resulting burn-out of the heat dissipation device prolongs the service life of the heat dissipation device.

Description of the drawings

The drawings described here are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and the description thereof are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

FIG. 1 is a schematic structural diagram of a heat dissipation device disclosed in Embodiment 1 of the present invention;

Fig. 2 is a top view of the heat sink shown in Fig. 1;

3 is a schematic diagram of the structure of the coil module in the heat sink shown in FIG. 1;

4 is a schematic diagram of the structure of the heat dissipation device disclosed in the second embodiment of the present invention;

Fig. 5 is a top view of the heat sink shown in Fig. 4;

6 is a schematic diagram of the structure of the heat dissipation device disclosed in the third embodiment of the present invention;

FIG. 7 is a schematic diagram of the structure of the heat dissipation device disclosed in the fourth embodiment of the present invention;

Fig. 8 is an exploded schematic diagram of the heat dissipation device shown in Fig. 7;

Fig. 9 is an exploded schematic diagram of the heat dissipation device disclosed in the fifth embodiment of the present invention;

FIG. 10 is a schematic diagram of the structure of the heat dissipation device disclosed in the sixth embodiment of the present invention.

Description of reference signs:

100-first magnetic part, 200-swing assembly, 210-base, 220-blade, 221-first end, 222-second end, 230-second magnetic part, 231-coil module, 231a-permeability Sheet, 231b-silica gel, 231c-coil, 240-connection part, 300-heat conduction sheet, 400-air duct shell, 410-air inlet, 420-heat pipe, 500-dust-proof net, 600-heat sink, 700-heating Device, 800-support seat.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be described clearly and completely below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The technical solutions disclosed in the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 to 2, the embodiment of the present invention discloses a heat dissipation device, and the disclosed heat dissipation device can be applied to electronic equipment. The heat dissipation device may specifically include a first magnetic member 100, a swing assembly 200, and a second magnetic member 230. The swing assembly 200 may include a base 210 and a blade 220. The first end 221 of the blade 220 may be a fixed end. The two ends 222 may be free ends, and the second end 222 may be suspended. The first end 221 of the blade 220 is connected to the base 210, and the second magnetic member 230 is disposed on the blade 220 and is adjacent to the second end 222 of the blade 220. Specifically, the first end 221 of the blade 220 is connected to the base 210 through the connecting portion 240. 210 is connected, and the base 210 can be connected with the heating device 700. The first magnetic member 100 and the second magnetic member 230 are spaced apart and the positions of the two are opposite, that is, the first magnetic member 100 and the second magnetic member 230 are in corresponding positions, and the two can be arranged face to face or separated by the blade 220. Open, as long as the magnetic fields of the two can interact. The magnetism of at least one of the first magnetic member 100 and the second magnetic member 230 is variable, where the magnetic variable may include the magnitude and direction of the magnetic force, so as to be between the first magnetic member 100 and the second magnetic member 230 Produce a changing magnetic effect.

When the first magnetic member 100 and the second magnetic member 230 interact, a magnetic force can be generated to drive the second end 222 of the blade 220 away from the first magnetic member 100, or close to the first magnetic member 100, so that the blade 220 continues to swing back and forth. This produces high-speed airflow to cool down the electronic equipment. That is, the heat dissipation device can swing the second end 222 of the blade 220 under the magnetic force of the first magnetic member 100 and the second magnetic member 230, thereby driving the entire blade 220 to swing, and the area formed by the blade 220 after swinging is similar to a fan shape. area. Specifically, the first magnetic member 100 may be directly disposed on other structures (such as a housing) of the electronic device, or the heat dissipation device further includes a support base 800 on which the first magnetic member 100 is disposed.

Compared with the original way that the fan rotates around the bearing to dissipate heat, the way that the blade 220 swings out of the wind in the embodiment of the present invention eliminates the problem of bearing wear caused by the relative rotation of the fan blade and the bearing, and improves the performance of the heat sink. reliability. In addition, the blade 220 swings out of the wind. There are no relatively rotating parts, so there is no gap between the relatively rotating parts. External impurities will not affect the swing of the blade 220, so there will be no problems. The burning of the radiating device caused by the blocking of rotation extends the service life of the radiating device. In addition, the way that the blades 220 swing back and forth to blow out the wind, compared with the traditional axial flow fan, reduces the eddy current noise and improves the user experience.

In an optional embodiment, the heat dissipation device further includes a thermally conductive sheet 300 connected to the side of the base 210 that faces away from the blade 220. The thermally conductive sheet 300 is suitable for connecting the heating device 700 so that the base 210 can conduct heat conduction. The sheet 300 is connected with the heating device 700 to reduce the contact thermal resistance when the heating device 700 conducts heat to the base 210, thereby improving the heat dissipation efficiency of the heat sink. Further, the material of the thermal conductive sheet 300 can be set to materials with good thermal conductivity, such as thermal conductive gel and thermal conductive silicone grease, but are not limited to these materials. In actual design, suitable materials can be selected according to requirements.

The first magnetic member 100 and the second magnetic member 230 may both be configured as electromagnets, or only one may be an electromagnet, and the other may be a permanent magnet. After the electromagnet is energized, the first magnetic member 100 and the second magnetic member 230 can interact to generate a magnetic force. At this time, mutual repulsive force or mutual attraction force can be generated between the two to force the blade 220 to swing. By changing the magnitude and direction of the current, the magnitude and direction of the magnetic field can be changed, so that the amplitude and magnitude of the swing of the blade 220 are changed, so as to realize the process of reciprocating swing of the blade 220 out of the wind. Optionally, considering that only one of the first magnetic member 100 and the second magnetic member 230 is set as an electromagnet, the swing action of the blade 220 can be more conveniently realized. Therefore, in the embodiment of the present invention, it is preferable that the first magnetic member 100 is a permanent magnet. The second magnetic member 230 is an electromagnet; or, the first magnetic member 100 is an electromagnet, and the second magnetic member 230 is a permanent magnet, so as to reduce the cost and power consumption of the electronic device.

Furthermore, as shown in FIG. 3, the above-mentioned electromagnet may include a coil module 231, and the coil module 231 may be adhered to the blade 220 by a thermally conductive glue, or directly welded to the blade 220. The coil module 231 includes a magnetic sheet 231a, silica gel 231b, and a coil 231c. The magnetic sheet 231a is connected to the coil 231c through the silica gel 231b. The wire of the coil module 231 can be led to the base 210 along the blade 220, and then connected to The circuit board forms an electromagnet when it is energized. When the coil 231c is energized, the first magnetic member 100 and the second magnetic member 230 act to destroy the force balance of the blade 220, forcing the second end 222 of the blade 220 to swing, and by continuously changing the direction of the current, the first The action of the magnetic member 100 and the second magnetic member 230 can generate forces in different directions, and drive the second end 222 of the blade 220 to move in different directions, thereby continuously swinging back and forth to generate high-speed airflow to cool the electronic device. Further, the input current may be a half-sine wave current, and the swing frequency and swing amplitude of the blade 220 can be adjusted by changing the frequency and voltage of the input current.

In the embodiment of the present invention, the second magnetic member 230 is disposed on the blade 220 and adjacent to the second end 222 of the blade 220. Specifically, as shown in FIGS. 4 to 5, the number of the second magnetic member 230 may be only one. The second magnetic member 230 is disposed on one side of the blade 220. At this time, the thickness of the swing assembly 200 is relatively small. In another embodiment, the number of second magnetic members 230 can be set to at least two, and each second magnetic member 230 is located on both sides of the second end 222 of the blade 220. Of course, when the number of second magnetic members 230 is When there are at least two, each second magnetic member 230 may also be located on one side of the second end 222. At least two second magnetic members 230 are provided on the blade 220, which can make the magnetic force generated between the first magnetic member 100 and the second magnetic member 230 stronger, so that the blade 220 has a larger swing amplitude and better heat dissipation effect. Each second magnetic member 230 is located on both sides of the second end 222 of the blade 220, so that the second magnetic member 230 can be more evenly distributed, and the magnetic force generated between the first magnetic member 100 and the second magnetic member 230 is also It can be more evenly distributed, so as to improve the stability of the blade 220 when it swings.

Further, the number of the first magnetic member 100 can be set to at least two, and each first magnetic member 100 is respectively arranged on both sides of the second magnetic member 230. When the heat dissipation device does not need to work, the blade 220 is affected by the first magnetic member on both sides. The magnetic force of a magnetic member 100 balances the forces on both sides and maintains a static state. When the heat dissipation device in the embodiment of the present invention is installed in an electronic device, the electronic device may frequently move or bump. At this time, the blade 220 is in a state of balanced force and will not easily swing. Therefore, the heat dissipation device is Increased reliability.

As shown in FIG. 6, in an embodiment, when the installation space permits, the number of the blade 220 and the first magnetic member 100 is at least two, and the first end 221 of each blade 220 is connected to the base 210. Each blade 220 is provided with a second magnetic member 230, and each first magnetic member 100 is provided corresponding to the second end 222 of each blade 220, respectively. When the second magnetic member 230 interacts with the corresponding first magnetic member 100, at least two blades 220 swing at the same time to generate a high-speed airflow to cool the electronic device, thereby improving the heat dissipation efficiency of the heat sink. Further, when the number of the blade 220 and the first magnetic member 100 is two, the angle formed between the two blades 220 may be 180°; when the number of the blade 220 and the first magnetic member 100 is three, the relative The angle formed between adjacent blades 220 may be 120°; when the number of blades 220 and the first magnetic member 100 is four, the angle formed between adjacent blades 220 may be 90°. Specifically, when designing the structure of the heat dissipation device, a suitable number can be selected according to the heat dissipation requirement and the installation space.

In the embodiment of the present invention, optionally, the blade 220 in the heat dissipation device can be configured as a heat conducting blade. When the first magnetic member 100 and the second magnetic member 230 interact, the blade 220 swings to generate high-speed airflow to dissipate heat. It can also conduct heat, so that the wind flowing through the blade 220 basically has no loss of wind speed and air volume, so the heat dissipation efficiency is higher. In addition, since there is no need to provide an additional heat sink, the space occupied by the entire heat sink is also reduced. Specifically, the blade 220 may be made of a metal with good thermal conductivity and flexibility, such as copper.

Further, the base 210 can also be made of a thermally conductive material. The base 210 is connected to the heating device 700. The heating device 700 conducts heat to the base 210 and then from the base 210 to the blade 220. The blade 220 swings to generate a high-speed airflow. Heat dissipation. Specifically, the base 210 may be made of metal such as aluminum and copper. Furthermore, in order to reduce the thermal resistance between the blade 220 and the base 210, the blade 220 and the base 210 need to maintain good contact, and the blade 220 can be fixed on the base 210 by cold fitting, welding or other methods. .

In order to improve the reliability of the heat dissipating device and avoid friction caused by frequent contact between the blade 220 and other structural parts during the swing process, there is a gap between the blade 220 and the plane where the base 210 is located. When the second magnetic member 230 acts to drive the blade 220 to swing, the blade 220 does not contact the base 210, and there is no contact between the structural members, and friction will not be generated to damage the components, thereby improving the reliability of the heat dissipation device.

As shown in Figs. 7-8, in the embodiment of the present invention, the heat dissipation device may also be provided with an air duct shell 400. The air duct shell 400 is provided with an air inlet 410. When the blade 220 swings, air enters from the air inlet 410 to ensure The air pressure inside the air duct shell 400 is stable, and at least one air outlet is opened on the air duct shell 400 so that the heat can be discharged in time. The air duct shell 400 may be arranged as an integral structure, or the air duct shell 400 may have a cover plate and a base, and the base and the cover plate of the air duct shell 400 are combined to form the entire heat dissipation air duct. The swing assembly 200 and the first magnetic member 100 are both arranged in the air duct shell 400. At this time, the heat dissipation device becomes an independent heat dissipation system. There is no need to rely on other structures of electronic equipment to form an air duct. The air duct shell 400 relies on its own air flow. The channel structure can achieve a good heat dissipation effect.

Specifically, the base of the air duct housing 400 can be integrally formed with the base 210. At this time, the first magnetic member 100 does not need to be installed on the support base 800, but the first magnetic member 100 is set on the base of the air duct housing 400. can. The base of the air duct shell 400 can use the same material with good heat conductivity as the base 210, so that the heat conduction effect of the air duct shell 400 is better. Further, the base of the air duct housing 400 may be connected to the heating device 700 through the heat conducting sheet 300, so as to reduce the contact thermal resistance, thereby improving the heat dissipation efficiency.

Further, the embodiment of the present invention may further define the structure of the air duct shell 400. Specifically, the direction in which the second end 222 of the blade 220 extends to the first end 221 is defined as the first direction, and the first direction is The cross section of the air duct shell 400 is vertical, and in the first direction, the cross-sectional area of the air duct shell 400 gradually decreases, that is, the volume of the air duct shell 400 gradually decreases in the first direction, so that the heat is dissipated. The space occupied by the device in the electronic equipment is reduced. Since the swing mode of the blade 220 is that the first end 221 is fixed and the second end 222 swings, the movement space required by the second end 222 is larger, and the movement space required by the first end 221 is smaller. The movement trajectory of the entire blade 220 is It is distributed in a fan shape in the direction opposite to the first direction, so the cross-sectional area of the air duct shell 400 gradually decreases in the first direction, which can just meet the movement space required when the blade 220 swings, which not only ensures the structure of the heat dissipation device It is compact and can save installation space.

In the embodiment of the present invention, the position of the air inlet 410 may be set at a position opposite to the base 210. When the blade 220 swings to cool the heating element 700 of the electronic device, the airflow at the air inlet 410 can also provide air cooling and heat dissipation. Since the base 210 is connected to the heating device 700, the distance between the air inlet 410 and the heating device 700 is small, which can dissipate heat more quickly and improve the heat dissipation efficiency of the heat sink.

As shown in Figures 7-8, in order to prevent external impurities from entering the air duct shell 400 and causing damage to the structural parts of the heat dissipation device, a dust-proof net 500 can be installed at the air inlet 410, which can block External impurities enter the air duct shell 400, thereby improving the reliability of the heat dissipation device.

As shown in FIG. 9, in the embodiment of the present invention, in order to improve the heat dissipation efficiency of the heat dissipation device, a plurality of heat dissipation fins 600 may be arranged adjacent to the second end 222 of the blade 220, and the heat dissipation fins 600 are arranged at intervals. Specifically, the heat dissipation fin 600 may be arranged on the base of the air duct shell 400, which is close to the second end 222 of the blade 220, and the addition of the heat dissipation fin 600 further improves the heat dissipation efficiency of the heat dissipation device.

Further, when the heat conducting sheet 300 is provided, the heat dissipation device mainly has two heat dissipation paths: one is that the heating device 700 conducts heat through the heat conducting sheet 300 to the base of the air duct shell 400, and then to the blade 220, which is generated by the swing of the blade 220 High-speed airflow dissipates heat; the second is that the heating device 700 conducts heat to the base of the air duct shell 400 through the heat conducting sheet 300, and then to the heat dissipation fin 600, and then dissipates heat through the high-speed airflow generated by the blade 220.

Furthermore, as shown in FIG. 10, in the embodiment of the present invention, the heat pipe 420 can be embedded in the air duct shell 400, or the whole or part of the air duct shell 400 can be set as a temperature equalizing plate, or the air duct shell 400 The heat pipe 420 is buried inside, and the air duct shell 400 is entirely or partially arranged as a uniform temperature plate. These three solutions can improve the heat exchange efficiency of the heat sink. Preferably, the embodiment of the present invention is provided with the heat pipe 420 and the uniform temperature plate at the same time, so as to achieve higher heat exchange efficiency.

The embodiment of the present invention also discloses an electronic device. The electronic device includes a heating device 700 and the heat dissipation device described in any of the above embodiments. The blade 220 of the heat dissipation device is arranged adjacent to the heating device 700. When the second end of the blade 220 swings At this time, the heat dissipation of the heating device 700 can be realized.

The electronic device disclosed in the embodiment of the present invention may be a smart phone, a tablet computer, an e-book reader, or a wearable device. Of course, the electronic device may also be other devices, which is not limited in the embodiment of the present invention.

The above embodiments of the present invention focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the conciseness of the text, here is No longer.

The foregoing descriptions are merely embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

A heat dissipation device, including:

The first magnetic piece;

A swing assembly, the swing assembly includes a base and a blade, a first end of the blade is connected to the base, and a second end of the blade is suspended;

A second magnetic member, the second magnetic member is disposed on the blade and adjacent to the second end of the blade;

The first magnetic member and the second magnetic member are arranged at intervals and opposite to each other. The magnetic properties of at least one of the first magnetic member and the second magnetic member are variable, so that the first magnetic member The second end of the blade swings under the action of the magnetic force of the second magnetic member and the second magnetic member.
The heat dissipation device according to claim 1, further comprising a thermally conductive sheet, the thermally conductive sheet is connected to a side of the base away from the blade, and the thermally conductive sheet is suitable for connecting a heating device.
The heat dissipation device according to claim 1, wherein the first magnetic member is an electromagnet, and the second magnetic member is a permanent magnet; or, the first magnetic member is a permanent magnet, and the second magnetic member is a permanent magnet. It is an electromagnet.
The heat dissipation device according to claim 1, wherein the number of the second magnetic member is at least two, and each of the second magnetic members is located on both sides of the second end; or, the second magnetic member Located on one side of the second end.
The heat dissipation device according to claim 1, wherein the number of the blade and the first magnetic member are both at least two, the first end of each blade is connected to the base, and each blade Each of the second magnetic parts is provided, and each of the first magnetic parts is arranged corresponding to the second end of each of the blades.
The heat dissipation device according to claim 1, wherein the number of the first magnetic member is at least two, and each of the first magnetic members is disposed on both sides of the second magnetic member.
The heat dissipation device according to claim 1, wherein the blade is a thermally conductive blade.
The heat dissipation device according to claim 1, further comprising an air duct shell, the air duct shell is provided with an air inlet, and the swing assembly and the first magnetic member are both arranged in the air duct shell.
8. The heat dissipation device according to claim 8, wherein the air inlet is opposite to the base.
The heat dissipation device according to claim 8, further comprising a dust-proof net, the dust-proof net being arranged at the air inlet.
The heat dissipation device according to claim 8, wherein the air duct shell is provided with a heat pipe; and/or, the air duct shell includes a uniform temperature plate.
The heat dissipation device according to claim 8, wherein the direction in which the second end extends to the first end is a first direction, and in the first direction, the cross-sectional area of the air duct housing gradually decreases Small, wherein the cross section is perpendicular to the first direction.
The heat dissipation device according to claim 1, further comprising a plurality of heat dissipation fins, the plurality of heat dissipation fins are adjacent to the second end of the blade, and each of the heat dissipation fins are arranged at intervals.
An electronic device, comprising a heating device and the heat dissipation device according to any one of claims 1-13, and the blade of the heat dissipation device is arranged adjacent to the heating device.