Heat dissipation device and portable electronic equipment

Abstract

The invention provides a heat dissipation device which is used for heat dissipation of portable electronic equipment, the portable electronic equipment comprises a control mainboard and a back shell, a heating source is arranged on the side, facing the back shell, of the control mainboard, the heat dissipation device comprises an air guide frame capable of conducting heat, a fan and a radiator, and the air guide frame is provided with an air inlet and an air outlet which are communicated with an inner cavity of the air guide frame. The radiator and the fan are both contained in an inner cavity of the air guide frame, the fan directly faces the air inlet, the radiator is closer to the air outlet compared with the fan, the air guide frame is connected to the back shell and stacked on the heating source, the orthographic projection of the radiator on the control mainboard covers the heating source, the back shell is provided with an air inlet hole and an air outlet groove which are spaced from each other, and the air inlet is communicated with the air inlet hole. The air outlet communicates with the air outlet groove. The invention further provides the portable electronic equipment provided with the heat dissipation device.

Description

Technical Field

[0001] The present invention relates to the field of heat dissipation of electronic equipment, and in particular to a heat dissipation device and a portable electronic equipment provided with the heat dissipation device. Background Art

[0002] Existing portable electronic devices such as mobile phones generally use graphite sheets or heat spreaders for passive heat dissipation. The heat generated by the heat-generating devices such as chips or batteries inside the mobile phone during operation is often transferred to the mobile phone screen, frame, back cover and other parts through heat dissipation materials such as graphite, VC, and thermal conductive gel; these parts dissipate heat into the air through natural convection with the air and heat radiation to the environment. With the increase in power consumption of electronic devices such as chips in mobile phones and high-power charging of batteries, the power consumption of mobile phones continues to increase. The existing passive heat dissipation capacity is limited and cannot meet the heat dissipation needs of mobile phones, resulting in significant temperature rise of the mobile phone, affecting performance and thermal experience. In order to improve the passive heat dissipation effect, some mobile phones use micro fans for active air cooling. The active air cooling can drive the external cold air medium to take away the heat inside the portable electronic device, which has a good heat dissipation effect; however, the heat transfer resistance of the heat source of the existing active heat dissipation device to the fan is large, which affects the efficiency of active air cooling. Summary of the invention

[0003] The present application provides a heat dissipation device with good heat dissipation efficiency, and a portable electronic device provided with the heat dissipation device.

[0004] The present application provides a heat dissipation device for dissipating heat for a portable electronic device, the portable electronic device comprising a control mainboard and a back shell, the control mainboard being provided with a heat source on a side facing the back shell, the heat dissipation device comprising a heat-conducting air guide frame, a fan and a radiator, the air guide frame having an air inlet and an air outlet connected to an inner cavity thereof, the radiator and the fan being both accommodated in the inner cavity of the air guide frame, the fan being directly opposite to the air inlet, the radiator being closer to the air outlet than the fan, the air guide frame being connected to the back shell, the air guide frame being stacked on the heat source, the radiator having an orthographic projection on the control mainboard covering the heat source, the back shell being provided with air inlet holes and air outlet slots spaced apart from each other, the air inlet being connected to the air inlet holes, and the air outlet being connected to the air outlet slots.

[0005] The present application also provides a portable electronic device, which includes a middle frame, a back shell, a control mainboard, and a heat dissipation device; the back shell covers the back of the middle frame, the control mainboard is arranged between the middle frame and the back shell, a heat source is arranged on the side of the control mainboard facing the back shell, and the heat dissipation device includes a heat-conducting air guide frame, a fan and a radiator, the air guide frame has an air inlet and an air outlet connected to its inner cavity, the radiator and the fan are both accommodated in the inner cavity of the air guide frame, the fan faces the air inlet, and the radiator is closer to the air outlet than the fan, the air guide frame is connected to the back shell, the air guide frame is stacked on the heat source, the positive projection of the radiator on the control mainboard covers the heat source, the back shell is provided with air inlet holes and air outlet slots spaced apart from each other, the air inlet is connected to the air inlet, and the air outlet is connected to the air outlet slot; the air guide frame of the heat dissipation device is arranged between the back shell and the control mainboard, and the radiator of the heat dissipation device faces the heat source.

[0006] The heat source of the portable electronic device of the present invention is attached to the heat-conducting air guide frame, the fan and the radiator are contained in the inner cavity of the air guide frame, the radiator faces the heat source, the air inlet of the air guide frame faces the fan, the air inlet is connected to the air inlet, the air outlet of the air guide frame is connected to the air outlet slot, the heat generated by the operation of the heat source can be directly transferred to the radiator through the air guide frame, and the fan can draw outside air from the air inlet through the radiator when it is running, and the outside air is discharged from the air outlet slot after heat exchange with the radiator. Since the heat generated by the operation of the heat source is only transferred to the radiator through the air guide frame, the physical distance from the heat source to the radiator is reduced, the heat transfer thermal resistance is reduced, and the air cooling and heat dissipation efficiency of the heat dissipation device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the implementation. Obviously, the drawings described below are some implementations of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0008] Figure 1 It is a schematic diagram of the three-dimensional structure of the portable electronic device in the first embodiment of the present application.

[0009] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of a portable electronic device from another perspective.

[0010] Figure 3 yes Figure 1 Schematic diagram of the three-dimensional structure explosion of the portable electronic device.

[0011] Figure 4 yes Figure 2Schematic diagram of the three-dimensional structure explosion of the portable electronic device.

[0012] Figure 5 yes Figure 4 The three-dimensional structure of the portable electronic device is further decomposed into a schematic diagram.

[0013] Figure 6 yes Figure 5 The three-dimensional structure of the portable electronic device is further decomposed into a schematic diagram.

[0014] Figure 7 yes Figure 6 The three-dimensional structure of the portable electronic device is further decomposed into a schematic diagram.

[0015] Figure 8 yes Figure 6 An enlarged view of section VIII in FIG.

[0016] Fig. 9 yes Figure 7 Magnified view of section IX in FIG.

[0017] Fig.10 yes Figure 6 A partial three-dimensional cross-sectional enlarged view of the heat dissipation device in FIG.

[0018] Fig.11 yes Fig.10 Schematic diagram of the three-dimensional structure explosion of the heat dissipation device.

[0019] Fig.12 yes Figure 2 A three-dimensional cross-sectional view of a portable electronic device in FIG.

[0020] Fig.13 yes Fig.12 A cross-sectional view of a portable electronic device in FIG.

[0021] Fig.14 It is a schematic cross-sectional structure diagram of a portable electronic device in the second embodiment of the present application.

[0022] Main markings:

[0023] 100, portable electronic device; 20, middle frame; 21, front; 22, first positioning cavity; 23, back; 24, second positioning cavity; 26, battery positioning cavity; 27, isolation strip; 30, back shell; 32, air inlet; 322, dustproof frame; 324, air guide ring; 34, air outlet slot; 342, inlet; 344, outlet; 40, control motherboard; 42, heat source; 421, heat-generating electronic device; 423, shielding cover; 60, heat dissipation device; 62, air guide frame; 620, air inlet ;621, air guide part;6210, air guide cavity;6212, first air guide plate;6214, second air guide plate;6215, first side plate;6216, end plate;625, air outlet part;6250, air outlet cavity;6252, first air outlet plate;6254, second air outlet plate;6255, second side plate;626, air outlet;65, fan;66, heat spreader;67, radiator;672, heat sink;674, fin;675, ventilation slot;70, battery;80, display screen. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In addition, the following descriptions of the various embodiments are made with reference to the attached drawings to illustrate specific embodiments that the present application may be implemented in. Directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set on..." should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] Please also read Figures 1 to 5The portable electronic device 100 in the first embodiment of the present invention comprises a middle frame 20, a back shell 30, a control mainboard 40, a heat dissipation device 60, a battery 70 and a display screen 80. The heat dissipation device 60 is used to dissipate heat for the portable electronic device 100. The display screen 80 is arranged at the front part of the middle frame 20, and the back shell 30 covers the back of the middle frame 20. The control mainboard 40 and the battery 70 are arranged between the middle frame 20 and the back shell 30. A heat source 42 is arranged on the side of the control mainboard 40 facing the back shell 30; the heat dissipation device 60 comprises a heat-conducting air guide frame 62, a fan 65 and a radiator 67. The control mainboard 40 is electrically connected to the display screen 80, the battery 70 and the fan 65, and the control mainboard 40 controls the display screen 80 and the fan 65. 5 and other electronic devices; the air guide frame 62 has an air inlet 620 and an air outlet 626 connected to its inner cavity, the radiator 67 and the fan 65 are both accommodated in the inner cavity of the air guide frame 62, the fan 65 is opposite to the air inlet 620, the radiator 67 is closer to the air outlet 626 than the fan 65, the air guide frame 62 is arranged between the back shell 30 and the control main board 40, the air guide frame 62 is connected to the back shell 30, the air guide frame 62 is stacked on the heat source 42, the radiator 67 is opposite to the heat source 42, specifically, the positive projection of the radiator 67 on the control main board 40 covers the heat source 42, the back shell 30 is provided with air inlet holes 32 and air outlet slots 34 spaced apart from each other, the air inlet 620 is connected to the air inlet holes 32, and the air outlet 626 is connected to the air outlet slot 34. When the portable electronic device 100 is working, the heat generated by the operation of the heat source 42 on the control mainboard 40 is transferred to the radiator 67 through the air guide frame 62. When the fan 65 is running, it can draw outside air from the air inlet 32 ​​and the air inlet 620 through the radiator 67. The outside air is discharged from the air outlet 626 and the air outlet slot 34 after heat exchange with the radiator 67.

[0028] It should be noted that the heat dissipation device 60 is installed on a portable electronic device, and the heat dissipation device 60 is used to dissipate heat for the portable electronic device. The portable electronic device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, a smart watch, a VR head-mounted display, a smart wearable device, etc., and the back shell of the portable electronic device is provided with a lens module decoration portion. The "connection" in the description of the embodiment of the present invention includes two situations: direct connection and indirect connection. For example, the connection between A and B includes direct connection between A and B or connection through a third element C or more other elements. The connection also includes two situations: integrated connection and non-integrated connection. The integrated connection means that A and B are formed and connected as one, and the non-integrated connection means that A and B are formed and connected as a non-integrated.

[0029] The heat source 42 of the portable electronic device 100 of the present invention is attached to the heat-conducting air guide frame 62, the fan 65 and the heat sink 67 are accommodated in the inner cavity of the air guide frame 62, the heat sink 67 faces the heat source 42, the air inlet 620 of the air guide frame 62 faces the fan 65, the air inlet 620 is connected to the air inlet hole 32, and the air outlet 626 of the air guide frame 62 is connected to the air outlet slot 34. The heat generated by the operation of the heat source 42 can be directly transferred to the heat sink 67 through the air guide frame 62, and the fan 65 can draw outside air from the air inlet hole 32 through the heat sink 67 when it is running. The outside air is discharged from the air outlet slot 34 after heat exchange with the heat sink 67. Since the heat generated by the operation of the heat source 42 is only transferred to the heat sink 67 through the air guide frame 62, the physical distance for the heat generated by the heat source 42 to be transferred to the heat sink 67 is reduced, the heat transfer resistance is reduced, and the air cooling and heat dissipation efficiency of the heat dissipation device 60 is improved.

[0030] like Figure 3 , Figure 6 and Figure 7 As shown, the middle frame 20 has a front side 21 and a back side 23. The front side 21 of the middle frame 20 is provided with a first positioning cavity 22, and the display screen 80 is positioned in the first positioning cavity 22; the back side 23 of the middle frame 20 is provided with a second positioning cavity 24 and a battery positioning cavity 26, and the second positioning cavity 24 is located at one end of the middle frame 20. The second positioning cavity 24 of the middle frame 20 and the battery positioning cavity 26 are provided with an isolation strip 27, the control mainboard 40 is positioned in the second positioning cavity 24, and the battery 70 is positioned in the battery positioning cavity 26. The middle frame 20 is made of a hard material with heat conductivity. Optionally, the middle frame 20 can be made of, but not limited to, aluminum alloy, stainless steel or titanium alloy.

[0031] The heat source 42 includes a heat generating electronic device 421 and a shielding cover 423 covering the heat generating electronic device 421, and the shielding cover 423 is made of a heat-conducting shielding material. The heat dissipation device 60 also includes a heat spreader 66, and the heat spreader 66 is clamped by the air guide frame 62 and the heat source 42; specifically, the heat spreader 66 is clamped by the shielding cover 423 and the air guide frame 62, thereby improving the efficiency of heat conduction from the heat source 42 to the air guide frame 62. The shielding cover 423 can be made of, but not limited to, tinplate, stainless steel, phosphor copper / brass nickel-plated material, or nickel silver; the heat spreader 66 can be, but not limited to, a copper sheet, a stainless steel sheet, or a pure titanium sheet. Optionally, the heat generating electronic device 421 and the shielding cover 423 are connected by a thermally conductive adhesive.

[0032] like Figure 8-Figure 11As shown, the air guide frame 62 includes an air guide portion 621 and an air outlet portion 625, the air guide portion 621 has an air guide cavity 6210, the air outlet portion 625 has an air outlet cavity 6250, the fan 65 and the heat sink 67 are accommodated in the air guide cavity 6210, the air inlet 620 is located at the air guide portion 621, the air outlet 626 is located at one end of the air outlet portion 625 away from the air guide portion 621, the air guide cavity 6210 is connected to the air outlet cavity 6250 to form an air outlet channel, and the air outlet channel is connected to the external air outside the portable electronic device 100. The air guide frame 62 is made of a hard material with heat conductivity, and the air guide frame 62 can be made of, but not limited to, aluminum alloy, stainless steel, or titanium alloy. Specifically, the air guide portion 621 includes a first air guide plate 6212 and a second air guide plate 6214 spaced in parallel, two first side plates 6215 and an end plate 6216, the two first side plates 6215 are respectively connected to the first air guide plate 6212 and the second air guide plate 6214 on opposite sides, the end plate 6216 is connected to the first air guide plate 6212, the second air guide plate 6214 and one end of the two first side plates 6215 facing away from the air outlet portion 625, the first air guide plate 6212, the second air guide plate 6214, the two first side plates 6215 and the end plate 6216 form an air guide cavity 6210; in this embodiment, the first air guide plate 6212, the second air guide plate 6214, the first side plate 6215 and the end plate 6216 are all rectangular plates, and the air guide cavity 6210 is a rectangular cavity. The air inlet 620 is located at one end of the second air guide plate 6214 away from the air outlet 625, that is, the air inlet 620 is located at one end of the second air guide plate 6214 close to the end plate 6216; the first air guide plate 6212 is attached to the heat source 42; specifically, the first air guide plate 6212 is attached to the shielding cover 423; the radiator 67 is clamped by the first air guide plate 6212 and the second air guide plate 6214, preferably, the first air guide plate 6212, the second air guide plate 6214 and the two first side plates 6215 all contact the radiator 67.

[0033] Optionally, the air outlet portion 625 is an arc-shaped air outlet tube that is bent toward one end away from the air guide portion 621, one end of the arc-shaped air outlet tube is connected to the air guide portion 621, and the other end of the arc-shaped air outlet tube is connected to the back shell 30, and the end of the arc-shaped air outlet tube that is away from the air guide portion 621 is arranged around the air outlet groove 34, and the air outlet is located at the end of the arc-shaped air guide tube that is away from the air guide portion 621. Specifically, the air outlet portion 625 includes a first air outlet plate 6252, a second air outlet plate 6254 and two second side plates 6255 which are spaced apart in parallel. The two second side plates 6255 are respectively connected to the first air outlet plate 6252 and the second air outlet plate 6254 on opposite sides. The first air outlet plate 6252, the second air outlet plate 6254 and the two second side plates 6255 form an air outlet cavity 6250. The first air outlet plate 6252 is connected between an end of the first air guide plate 6212 away from the end plate 6216 and the back shell 30. The second air outlet plate 6254 is connected between an end of the second air guide plate 6214 away from the end plate 6216 and the back shell 30. The two second side plates 6255 are respectively connected between an end of the two first side plates 6215 away from the end plate 6216 and the back shell 30. The air guide cavity 6210 is connected to the air outlet cavity 6250. In this embodiment, the second side plate 6255 is an inclined plate, the first air outlet plate 6252 and the second air outlet plate 6254 are both arc-shaped plates, one side of the first air outlet plate 6252 is sealed and connected to the end of the first air guide plate 6212 away from the end plate 6216, the first air outlet plate 6252 is bent away from the first air guide plate 6212 and is sealed and connected to the back shell 30; one side of the second air outlet plate 6254 is sealed and connected to the end of the second air guide plate 6214 away from the end plate 6216, the second air outlet plate 6254 is bent away from the end plate 6216, and the second air outlet plate 6254 is bent away from the end plate 6216. One end away from the second air guide plate 6214 is bent and sealed to the back shell 30; one end of the two second side panels 6255 is respectively sealed to the end of the two first side panels 6215 away from the end plate 6216, the second side panels 6255 are bent toward the end away from the first side panel 6215 and sealed to the back shell 30, and the air outlet cavity 6250 is an arc-shaped cavity bent toward the end away from the air guide cavity 6210. When the wind generated by the fan 65 is running, it will flow out obliquely toward the end away from the air inlet 620 after passing through the air outlet cavity 6250.

[0034] In other embodiments, the heat sink 67 , the air guide portion 621 , and the air outlet portion 625 may be integrally formed of a thermally conductive material.

[0035] Optionally, the heat sink 67 includes a heat sink 672 and a plurality of fins 674 spaced apart from each other, the plurality of fins 674 being disposed on the heat sink 672, and each two adjacent fins 674 forming a ventilation slot 675. When the heat sink 67 is accommodated in the air guide cavity 6210, the heat sink 672 is attached to the first air guide plate 6212, the side of the fin 674 facing away from the heat sink 672 contacts the second air guide plate 6214, and the two opposite fins 674 of the heat sink 67 contact the two first side plates 6215 respectively. The heat sink 67 is made of a high thermal conductivity metal material, which may be, but is not limited to, stainless steel, aluminum alloy, copper alloy, or rare earth alloy.

[0036] like Figure 8-Figure 9 and Fig.12 As shown, the air outlet slot 34 of the back shell 30 is an arc-shaped slot that bends toward the side away from the air inlet hole 32. The air outlet slot 34 has an inlet 342 that passes through the surface of the back shell 30 facing the air guide frame 62, and the air outlet slot has an outlet 344 that passes through the surface of the back shell 30 facing away from the air guide frame 62. The inlet 342 is closer to the air inlet hole 32 than the outlet 344. When the wind generated by the operation of the fan 65 passes through the air outlet slot 34, it will flow out obliquely toward the end away from the air inlet hole 32 to prevent the hot air flowing out of the air outlet slot 34 from flowing back to the air inlet hole 32. In this embodiment, the air inlet hole 32 and the air outlet slot 34 are close to the lens module of the portable electronic device. Optionally, the back shell 30 is provided with a dustproof frame 322 in the air inlet hole 32. The surface of the back shell 30 facing the air guide frame 62 is provided with an air guide ring 324 around the air inlet hole 32.

[0037] like Figure 1-Figure 6 and Figure 12-13As shown, when assembling the portable electronic device 100, the display screen 80 is installed in the first positioning cavity 22 of the middle frame 20, so that the display screen 80 is fixedly connected to the middle frame 20; the control mainboard 40 is installed in the second positioning cavity 24, so that the heat source 42 is located on the side of the control mainboard 40 away from the display screen 80; the battery 70 is installed in the battery positioning cavity 26, the heat spreader 66 is attached to the shielding cover 423 and the battery 70, the air guide frame 62 is connected to the inner side of the back shell 30, and the air guide ring 324 is sealed and connected to the air guide portion 621 around the air inlet 620. The air inlet is connected to the air inlet hole 32, and the end of the air outlet portion 625 facing away from the air guide portion 621 is sealed and connected to the back shell 30 around the air outlet slot 34, so that the air outlet cavity 6250 is connected to the air outlet slot 34, that is, the inner cavity (i.e., the air duct) of the air guide frame 62 is sealed and does not exchange gas with the inside of the portable electronic device 100; the back shell 30 is installed on the back side 23 of the middle frame 20, so that the air guide frame 62 is attached to the heat spreader 66 facing the shielding cover 423, so that the positive projection of the radiator 67 on the control main board 40 covers the heat generating electronic device 421. The air inlet 32 ​​of the portable electronic device 100 is close to the air inlet of the fan 65. The working mode of the fan 65 is to take in air from the air inlet 32 ​​of the back shell 30 and to discharge air from the air outlet 34 of the back shell 30. The running direction of the airflow generated by the fan 65 is: the air inlet 32 ​​of the back shell 30 of the portable electronic device 100 → the air inlet of the fan 65 → the air outlet of the fan 65 → the air guide cavity 6210 → the heat sink 67 → the air outlet 626 → the air outlet 34 of the back shell 30. It can be understood that in actual design, different shapes of the air guide frame 62, the heat sink 67, the air inlet 32 ​​and the air outlet 34 can also be designed according to the characteristics of the product and ID.

[0038] Optionally, the air guide frame 62 can be fixedly connected to the back shell 30 by gluing or riveting. The heat spreader 66 and the shielding cover 423 are connected by thermal conductive adhesive, and / or the heat spreader 66 and the air guide frame 62 are connected by thermal conductive adhesive to further improve the heat conduction efficiency.

[0039] When the portable electronic device 100 is in use, the heat generated by the heat source 42 is conducted to the air guide frame 62 through the shielding cover 423 and the heat spreader 66, and then to the radiator 67; the heat spreader 66 has a temperature equalizing function to improve the efficiency of heat conduction to the air guide frame 62; at the same time, the fan 65 is operated to provide gas power to draw the outside air into the air inlet 32 ​​of the back shell 30, such as Fig.13As shown by the arrows, the outside air is then discharged from the air outlet slot 34 through the air guide cavity 6210, the ventilation slot 675 of the heat sink 67 and the air outlet cavity 6250; when the outside air passes through the ventilation slot 675, the outside air exchanges heat with the heat sink 67 and then is discharged from the air outlet slot 34 through the air outlet cavity 6250; thus, the heat generated during the operation of the portable electronic device 100 is quickly transferred to the surrounding outside air, reducing the temperature of the heat source 42 and the surface temperature of the portable electronic device 100. Since the air outlet slot 34 is an arc-shaped slot, the wind generated by the operation of the fan 65 passes through the air outlet slot 34 and flows out obliquely to the end away from the air inlet hole 32 and away from the air inlet hole 32, which can prevent the hot air flowing out of the air outlet slot 34 from flowing back to the air inlet hole 32, thereby improving the heat dissipation efficiency.

[0040] When the portable electronic device 100 is in a call or video call, the fan 65 needs to be turned off to avoid affecting the normal operation of the portable electronic device 100. Therefore, part of the heat generated by the heat source 42 of the portable electronic device 100 during operation is transferred to the air guide frame 62 and the radiator 67 through the shielding cover 423 and the heat spreader 66, and then transferred to the back shell 30. The outer surface of the back shell 30 exchanges heat with the outside air and dissipates it in a natural heat dissipation manner; the other part of the heat is transferred to the display screen 80 through the middle frame 20. The outer surface of the middle frame 20 and the light-emitting surface of the display screen 80 exchange heat with the outside air and dissipate it in a natural heat dissipation manner. Since there is no additional air layer on the heat transfer path where the heat generated by the heat source 42 is transferred to the back shell 30, the thermal resistance is small. Therefore, the portable electronic device 100 has a strong natural heat dissipation capacity.

[0041] The heat source 42 of the portable electronic device 100 of the present application is placed on a side close to the back shell 30, and the positive projection of the radiator 67 on the control main board 40 covers the heat source 42, which reduces the physical distance from the heat source 42 to the radiator 67, and reduces the heat transfer resistance on the heat transfer link from the heat generated by the operation of the heat source 42 to the radiator 67, so that the total thermal resistance is minimized, and the heat transfer path of the outside air sucked by the fan 65 is shorter, so the heat dissipation efficiency of the portable electronic device 100 is better. Secondly, when the fan 65 is turned off, there is no additional air layer on the heat transfer path from the heat generated by the operation of the heat source 42 to the back shell 30, so the natural heat dissipation capacity of the portable electronic device 100 will not deteriorate, which improves the natural heat dissipation capacity of the portable electronic device 100; the heat spreader 66 conducts the heat generated by the heat source 42 for heat spread, and even if the fan 65 is not turned on, it can have a good passive heat dissipation effect. In addition, the air inlet 32 ​​and the air outlet slot 34 are both designed on the back shell 30. The air outlet direction can be controlled by the shape of the air outlet cavity 6250 of the air outlet portion 625 to avoid the backflow problem from the air inlet 620, thereby improving the heat dissipation efficiency.

[0042] In other embodiments, the heat dissipation device 60 can be extended to other usage scenarios, such as applying the heat dissipation device 60 to electronic products such as laptop computers and PADs for heat dissipation. The CPU and GPU of existing laptop computers generate heat during operation, which is mainly transferred to the heat dissipation fins near the fan through VC or heat pipes, and the heat is taken away by the heat dissipation fins through the working wind of the fan. In this structure, the heat source such as the CPU and GPU can be placed on one side close to the radiator, and the radiator can be placed directly opposite the heat source, that is, the radiator is in a projection position directly opposite the heat source, thereby reducing the heat transfer thermal resistance to achieve the effect of quickly dissipating the heat source.

[0043] like Fig.14 As shown, the structure of the portable electronic device 100a of the second embodiment of the present application is similar to the structure of the portable electronic device 100 of the first embodiment, and the difference is that: the shape of the air outlet portion 625a of the portable electronic device 100a is different from the shape of the air outlet portion 625 in the first embodiment; specifically, the air outlet portion 625a is an inclined air outlet tube inclined toward the side away from the air guide portion 621, one end of the inclined air outlet tube is sealed to the air guide portion 621, and the other end of the inclined air outlet tube is sealed to the back shell 30, and the end of the inclined air outlet tube facing away from the air guide portion 621 is sealed and surrounded by the back shell 30 around the air outlet groove 34a, and the air outlet is located at the end of the inclined air outlet tube facing away from the air guide portion 621, and the air outlet groove 34a is connected to the air outlet cavity 6250. In this embodiment, the first air outlet plate 6252 and the second air outlet plate 6254 of the air outlet portion 625a are both inclined plates. One side of the first air outlet plate 6252 is sealed and connected to the end of the first air guide plate 6212 away from the fan 65. The first air outlet plate 6252 is inclined toward the end away from the first air guide plate 6212 and is sealed and connected to the back shell 30. One side of the second air outlet plate 6254 is sealed and connected to the end of the second air guide plate 6214 away from the fan 65. The second air outlet plate 6254 is inclined toward the end away from the second air guide plate 6214. The ends of the two second side panels are respectively sealed and connected to the ends of the two first side panels away from the fan 65, and the second side panels are inclined toward the end away from the first side panels and are sealed and connected to the back shell 30. The air outlet cavity 6250 is an inclined cavity inclined toward the end away from the air guide cavity 6210, and the air outlet slot 34a is an inclined slot inclined toward the side away from the air inlet 32. The inclination angle of the inclined cavity is similar to the inclination angle of the inclined slot. In this embodiment, the inclination angle of the inclined cavity is equal to the inclination angle of the inclined slot. When the wind generated by the operation of the fan 65 passes through the air outlet cavity 6250, it flows out from the air outlet slot 34a toward the end away from the air inlet 620, so as to avoid the hot air flowing out of the air outlet slot 34a from flowing back to the air inlet 32, thereby improving the heat dissipation efficiency.

[0044] The beneficial effects of the portable electronic device 100a of the second embodiment of the present application are similar to the beneficial effects of the portable electronic device 100 of the first embodiment, and are not described separately here.

[0045] The above is an implementation of the embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A heat dissipation device for dissipating heat for a portable electronic device, the portable electronic device comprising a control mainboard and a back shell, the control mainboard having a heat source disposed on a side facing the back shell, characterized in that: The heat dissipation device includes a heat-conducting air guide frame, a fan and a radiator, the air guide frame has an air inlet and an air outlet connected to its inner cavity, the radiator and the fan are both accommodated in the inner cavity of the air guide frame, the fan is directly opposite to the air inlet, and the radiator is closer to the air outlet than the fan, the air guide frame is connected to the back shell, the air guide frame is stacked on the heat source, the radiator's orthographic projection on the control main board covers the heat source, the back shell is provided with air inlet holes and air outlet slots spaced apart from each other, the air inlet is connected to the air inlet, and the air outlet is connected to the air outlet slot.

2. The heat dissipation device according to claim 1, characterized in that: The heat dissipation device further includes a heat spreader, and the heat spreader is clamped by the air guide frame and the heat source.

3. The heat dissipation device according to claim 1, characterized in that: The air guide frame includes an air guide portion and an air outlet portion, the air guide portion has an air guide cavity, the air outlet portion has an air outlet cavity, the fan and the radiator are accommodated in the air guide cavity, the air inlet is located in the air guide portion, the air outlet is located at one end of the air outlet portion away from the air guide portion, and the air guide cavity is connected to the air outlet cavity to form an air outlet channel.

4. The heat dissipation device according to claim 3, characterized in that: The air outlet portion is an arc-shaped air outlet tube bent toward one end away from the air guide portion, one end of the arc-shaped air outlet tube is connected to the air guide portion, the other end of the arc-shaped air outlet tube is connected to the back shell, the end of the arc-shaped air outlet tube facing away from the air guide portion is surrounded by the air outlet groove, and the air outlet is located at the end of the arc-shaped air guide tube facing away from the air guide portion.

5. The heat dissipation device according to claim 3, characterized in that: The air outlet portion is an inclined air outlet tube inclined toward a side away from the air guide portion, one end of the inclined air outlet tube is connected to the air guide portion, the other end of the inclined air outlet tube is connected to the back shell, the end of the inclined air outlet tube facing away from the air guide portion is surrounded by the air outlet groove, and the air outlet is located at the end of the inclined air outlet tube facing away from the air guide portion.

6. The heat dissipation device according to claim 4 or 5, characterized in that: The air outlet slot of the back shell is an inclined slot or an arc-shaped slot, and the air outlet slot has an inlet passing through the back shell and facing the surface of the air guide frame, and the air outlet slot has an outlet passing through the back shell and away from the surface of the air guide frame, and the inlet is closer to the air inlet than the outlet.

7. The heat dissipation device according to claim 3, characterized in that: The air guide portion includes a first air guide plate and a second air guide plate spaced in parallel, two first side plates and an end plate, the two first side plates are respectively connected to opposite sides of the first air guide plate and the second air guide plate, the end plate is connected to the first air guide plate, the second air guide plate and one end of the two first side plates facing away from the air outlet portion, the first air guide plate, the second air guide plate, the two first side plates and the end plate form the air guide cavity, the first air guide plate is attached to the heat source, the air inlet is located at an end of the second air guide plate away from the air outlet portion, and the radiator is clamped by the first air guide plate and the second air guide plate.

8. The heat dissipation device according to claim 7, characterized in that: The air outlet portion includes a first air outlet plate, a second air outlet plate and two second side plates spaced in parallel, the two second side plates are respectively connected to the opposite sides of the first air outlet plate and the second air outlet plate, the first air outlet plate, the second air outlet plate and the two second side plates form the air outlet cavity, the first air outlet plate is connected between one end of the first air guide plate facing away from the end plate and the back shell, the second air outlet plate is connected between one end of the second air guide plate facing away from the end plate and the back shell, and the two second side plates are respectively connected between one end of the two first side plates facing away from the end plate and the back shell.

9. The heat dissipation device according to claim 8, characterized in that: The second side plate is an inclined plate, and the first air outlet plate and the second air outlet plate are both inclined plates or arc-shaped plates.

10. A portable electronic device, characterized in that: The portable electronic device comprises a middle frame, a back shell, a control mainboard, and a heat dissipation device as described in any one of claims 1 to 9; the back shell covers the back of the middle frame, the control mainboard is arranged between the middle frame and the back shell, a heat source is provided on the side of the control mainboard facing the back shell, the air guide frame of the heat dissipation device is arranged between the back shell and the control mainboard, and the radiator of the heat dissipation device is directly facing the heat source.

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