WO2015117336A1

WO2015117336A1 - Heat radiation device

Info

Publication number: WO2015117336A1
Application number: PCT/CN2014/087220
Authority: WO
Inventors: 吴典锋
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-07-17
Filing date: 2014-09-23
Publication date: 2015-08-13
Also published as: CN204014385U

Abstract

A heat radiation device (10). The device (10) comprises a shell (11), a fan (12), a first fixing bracket (13) for fixing the fan (12), a first air opening (14) and a second air opening (15), wherein the fan (12) is fixed to a bottom plane of the shell (11) via the first fixing bracket (13); the second air opening (15) is located at one side of the bottom plane of the shell (11) to which the first fixing bracket (13) is fixed; and the first air opening (14) is located at the other side of the bottom plane of the shell (11).

Description

Heat sink

Technical field

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

Background technique

In the process of implementing the technical solutions of the embodiments of the present application, at least the following technical problems exist in the related technologies:

With the increase in the rate of mobile broadband terminals using Long Term Evolution (LTE) and Wifi, the power of these mobile broadband terminals, especially box products and mobile routing products, is more than 10w, even more than 20w, the motherboard temperature And surface temperature has become a key issue for such products.

At present, the solution to this problem is to increase the size of the whole machine and increase passive heat dissipation measures such as heat sinks. However, with the increase of power consumption, increasing the size of the whole machine can not effectively avoid the problem of overheating of the main board, and with the increasing size of the whole machine, the related passive cooling measures can not meet the overheating of mobile broadband products. The problem.

However, for the above problems, there is no effective solution to the related art.

Summary of the invention

In view of this, the embodiments of the present invention provide a heat dissipating device, which can balance the appearance and cost of the product.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:

An embodiment of the present invention provides a heat dissipating device, the device comprising: a housing, a fan, a first fixing frame for fixing the fan, a first air outlet, and a second air outlet; wherein the fan passes through the first fixing frame Fixed on a bottom plane of the casing, the second tuyere is located on a bottom plane of the casing to fix one side of the first fixing frame, and the first tuyere is located on a bottom plane of the casing Another side.

In the above solution, the outer surface of the bottom plane of the casing is provided with a partition body, and the partition body isolates the second tuyere and the first tuyere from two sides of the bottom plane of the casing.

In the above solution, the plane of the casing other than the bottom plane is a sealing surface.

In the above solution, the second fixing bracket is disposed inside the housing, and the second fixing bracket fixes the vertical main board between the first air outlet and the second air outlet.

In the above solution, the top end of the second fixing frame relative to the bottom plane of the housing is provided with a vent hole.

In the above solution, the upper surface of the bottom plane of the casing is provided with a heat insulation board, and the top end of the heat insulation board is fixed to the lower surface of the horizontally disposed main board, and is disposed on the second fixing frame for fixing the main board. Vents.

In the above solution, the fan is an axial fan or a centrifugal fan.

The embodiment of the present invention provides a heat dissipating device, a housing, a fan, a first fixing frame of the fixed fan, a first air outlet, and a second air outlet; wherein the fan is fixed to the bottom plane of the housing through the first fixing frame, The second tuyere is located on a bottom plane of the housing to fix one side of the first fixing frame, and the first tuyere is located on the other side of the bottom plane of the housing; thereby, the appearance effect of the mobile broadband terminal product can be significantly improved. It achieves the second-level waterproof effect, saves the air duct sealing accessories and brackets, saves the dust-proof net or metal dust-proof net that needs to be increased in the appearance of the opening, reduces the noise, and leaks light, and improves the user experience.

BRIEF abstract

1 is a schematic structural view of a heat dissipating device provided by the present invention;

2 is a schematic structural view of another heat dissipating device provided by the present invention;

FIG. 3 is a schematic structural view of still another heat dissipating device provided by the present invention.

DESCRIPTION OF REFERENCE NUMERALS: 10, heat sink; 11, housing; 12, fan; 13, first mount; 14, first tuyere; 15, second tuyere; 16, spacer; 17, second mount; 18, main board; 19, ventilation holes; 20, heat insulation board, 21, heat sink; 22, gasket.

Preferred embodiment of the invention

In the embodiment of the present invention, the fan is fixed to the bottom plane of the casing through the first fixing bracket, and the second tuyere is located on a bottom plane of the casing to fix the side of the first fixing bracket The first tuyere is located on the other side of the bottom plane of the housing.

The implementation method of the present invention will be described below with reference to the accompanying drawings:

As shown in FIG. 1 , the device 10 provided by the embodiment of the present invention includes: a housing 11 , a fan 12 , a first fixing frame 13 for fixing the fan, a first tuyere 14 , and a second tuyere 15 ; A fixing frame 13 is fixed on a bottom plane of the casing 11, a second tuyere 15 is located on a bottom plane of the casing 11 to fix one side of the first fixing frame 13, and the first tuyere 14 is located on a bottom plane of the casing 11. The other side. The outside of the bottom plane of the casing 11 is provided with a separator 16 for isolating the second tuyere 15 from the first tuyere 14 on both sides of the bottom plane of the casing 11. The plane of the casing 11 other than the bottom plane is a sealing surface. A second fixing frame 17 is disposed inside the casing 11 , and the second fixing frame 17 fixes the vertical main plate 18 between the first tuyere 14 and the second tuyere 15 . A vent hole 19 is provided at a top end of the second fixing frame 17 with respect to the bottom plane of the housing 11. Wherein, the sealing surface is a plane without a tuyere or an opening.

Here, each component in the structure of the heat sink provided by the present invention shown in Fig. 1 will be described.

The housing 11 is composed of a front shell and a rear shell, and may also include a middle shell or other decorative parts;

The main board 18 mainly comprises a main board, a patch device thereof and a shielding cover. For a terminal, the heat generating chip and the device are basically concentrated in the shielding cover of the front and back sides. The main board 18 is assembled in the middle of the housing 11, and divides the housing 11 into two air chambers up and down or left and right; wherein the two air chambers are divided into air passages through which cold air and hot air flow.

The fan 12 may be an axial fan or a centrifugal fan. In the terminal of the horizontal structure of the casing 11, the axial fan is used to reduce the volume. In the terminal 11 of the vertical structure of the casing 11, if the width of the terminal is W Strict requirements, a centrifugal fan placed vertically can be selected to reduce the width W of the terminal. If there is no limit to the width W, an axial fan can be used to reduce the cost.

The first tuyere 14 is located at the bottom plane of the casing 11, and after the terminal is lifted by the spacer 16 and the foot pad (not shown), air is introduced from the gap around the terminal.

The heat sink 21, when the local temperature of the main board 18 is too high, needs to use a heat sink to increase the heat dissipation area, and is fixed on the shield by the thermal adhesive. The heat sink can be changed to a plate shape or canceled to reduce the cost if the power consumption of the whole machine is not large.

The gasket 22, which may be a foam or a backing, is located on the first holder 13 of the fixed fan 12. The air outlet surface of the fan 12 and the casing are sealed by the gasket 22, and the hot air of the air outlet of the fan 12 is ensured to flow out of the second air outlet 15 of the terminal to prevent hot air from flowing back.

The second tuyere 15 is located at the bottom plane of the casing 11, and the hot air flows out through the second tuyere 15, and then blows to the table top, and flows out from the surrounding gap after the whole mat is raised.

In the heat dissipating device provided by the present invention, the second tuyere as the air outlet and the first tuyere as the air inlet are located on the bottom plane of the casing 11, and the screens other than the bottom plane when the terminal is placed on the table can be sufficiently ensured. The surface is sealed and has no heat dissipation holes. It can be waterproofed by IPX2 level while ensuring beautiful appearance. In addition, the second air outlet faces the desktop to ensure that the fan noise is transmitted to the desktop and then reflected by the desktop before being heard by the user, thus reducing the part. noise.

The partition body 16 is located between the first tuyere and the second tuyere to prevent the hot air of the second tuyere from being absorbed by the first tuyere.

The airflow direction formed by the structure of the heat dissipating device of the embodiment of the present invention, the cold airflow turns into a hot airflow from the bottom plane of the casing after being swirled for one week in the casing, which can fully improve the heat uniformity of the surface of the main board and improve the heat dissipation capability of the surface of the casing. To reduce the working time of the fan, the fan works intermittently when the whole machine works. When the temperature of the main board rises to the first threshold, the fan stops working. When the temperature of the main board drops to the second threshold, the fan starts running. In the device of the present invention, after the fan stops working, the heat of the main board is uniform, which can effectively extend the working interval of the fan; wherein, the first threshold is a high temperature threshold, and the second threshold is a low temperature threshold.

In the heat sink of the embodiment of the invention, the housing is isolated to the left by the main board or the second fixing frame The right or upper and lower casings form a natural air duct, which is beneficial to the assembly of the heat sink and the reduction of the cost of the whole machine, avoiding the increase of the air duct baffle and reducing the auxiliary materials entering and exiting the air outlet.

In FIG. 1, the housing 11 of the device 10 is a vertical box type terminal housing including, but not limited to, a front case, a middle case, and a rear case. The fan 12 is fixed inside the casing 11 by a first mount 13 fixed to the bottom plane of the casing 11, providing aerodynamic force to the apparatus 10. The second tuyere 15 is provided on the bottom plane of the casing 11 as the air outlet 15 on one side of the first fixing frame 13 , and the first tuyere 14 is located on the other side of the bottom surface of the casing 11 as the air inlet. The main board 18 is assembled in the middle of the housing 11 through the second fixing frame 17, and the housing 11 is divided into two left and right cavities to form an air flow path; the main board 18 is provided with a heat sink 21 for carrying the heat of the chip on the main board 18. On a larger area of the heat sink, the heat dissipation area is increased, and the heat dissipation efficiency is increased. When the power consumption is small, the heat sink 21 can be removed or changed to a plane to reduce the cost; the first fixing frame 13 is provided with a gasket 22 It is used to seal the fan 12 and the second tuyere 15 to avoid backflow of hot air. A partition 16 is provided on the outer surface of the bottom plane of the casing 11, and the partition 16 is located between the second tuyere 15 and the first tuyere 14 to prevent hot air from the second tuyere 15 from flowing to the first tuyere 14.

The air passage for the fan heat dissipation of the device 10 is constructed by the above structure, wherein the direction of the wind flow is as indicated by an arrow in the figure, and the solid line is hot air. The dotted line is cold wind. The specific flow direction of the wind flow is: the cold air enters the device 10 from the first tuyere 14 and passes through the fins 21 on the left side surface of the main board 18. At this time, the wind flow passing through the fins 21 becomes hot air from the cold air, and the hot air passes through the top of the second fixing frame 17 The remaining venting holes 19, flowing to the cavity on the right side of the device, flow to the fan 12 through the surface on the right side of the main plate 18, and the fan 12 blows hot air from the second tuyere 15, forming a circulation of the cold air on the left side and the hot air on the right side.

Here, the fan 12 can be self-started or stopped according to the temperature of the main board 18. When the temperature of the main board 18 rises to the first threshold, the operation stops, and the operation resumes after the temperature of the main board drops to the second threshold.

In Fig. 1, the second tuyere 15 and the first tuyere 14 are simultaneously provided at the bottom plane of the casing 11, so that the entry of cold air and the outflow of hot air simultaneously pass through the foot pad (not shown) of the casing 11 and the intermediate partition. 16 The raised gap is performed, and the second tuyere 15 and the first tuyere 14 are disposed at the bottom of the casing 11 to facilitate the appearance effect, and the domestic water can be prevented from falling from the top of the device 10 into the first tuyere 14 or the second tuyere 15, Therefore, the damage of the terminal where the device 10 is located is avoided, and the second air outlet 15 can reduce the noise from the bottom plane of the housing; the airflow on both sides of the main board 18 can ensure the heat dissipation of the main board 18 is uniform, and there is no heat dissipation blind zone. The second air outlet 15 is saved to improve the heat dissipation efficiency under the premise of providing an air filter. Further, a hole is formed in the bottom plane of the casing 11 to provide the first tuyere 14 and the second tuyere 15, so that there is no fear of appearance defects such as light leakage, and the user experience is improved.

In the embodiment of the present invention, the fan 12 may be an axial fan or a centrifugal fan. The fan 12 in Fig. 1 is an axial fan, and the hot air is blown along the fan shaft and blown in the same direction, so that the width of the fan 12 limits the width of the terminal where the device 10 is located, but the fan is low in cost. Can be used on terminals that are not sensitive to the width of the whole machine.

As shown in FIG. 2, the axial fan used in the fan 12 is replaced by a centrifugal fan. Since the terminal in which the device shown in FIG. 2 is located is sensitive to the width, on the basis of FIG. 1, the fan 12 uses a centrifugal fan and a fan. 12, the wind is introduced from the left and right sides, and the air is discharged from the bottom at a vertical angle of 90 degrees. The fan 12 is vertically placed in the casing 11, effectively reducing the width occupied by the fan 12, thereby reducing the width of the device and the length of the fan. The width requirement is small.

FIG. 3 illustrates a heat sink device according to an embodiment of the present invention, in which the terminal of the device provided by the embodiment of the present invention is a horizontal box type terminal. Here, the shell 11 of the horizontal box type terminal adopts a horizontal design.

For the device shown in FIG. 3, the main board 18 is placed laterally in the middle of the housing 11, and the upper surface of the bottom surface of the housing 11 is provided with a heat insulating panel 20, and the top end of the heat insulating panel 20 is fixed to the lower surface of the horizontally disposed main board 18, A vent hole 19 is provided in the second fixing frame 17 for fixing the main board 18. As shown in FIG. 3, ventilation holes 19 are respectively provided at both ends of the second fixing frame 17, wherein the two ventilation holes 19 are used for the circulation of cold air and hot air, respectively. The axial fan 12 is located on the right side below the main board 18. The first tuyere 14 is on the left side of the bottom plane of the casing 11, and the fins 21 are located on the chip on the main board 18 where the heat is severe. When the fan 12 When working, the direction of the wind flow is shown by the arrow in the figure, the solid line is hot air, and the dotted line is cold wind. The cold air flows from the first tuyere 14 and flows through the vent hole 19 between the left side of the main board 18 and the casing 11 to the upper surface of the main board through the bottom of the main board 18, and then flows from the left to the right through the fins 21 and the right vent hole 19 to the fan. 12, the air outlet surface of the fan 12 and the casing 11 are separated by a gasket 22, and hot air flows out from the second tuyere 15. The use of an axial fan in the horizontally designed housing 11 not only saves space, but also limits the size of the fan, and has more options to reduce cost and noise.

It should be noted that the difference between FIG. 3 and FIG. 1 is that the heat insulation board 20 is required under the main board 18 inside the casing 11 to prevent air from directly flowing from the bottom of the main board 18 to the fan 12.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Industrial applicability

The embodiment of the invention can significantly improve the appearance effect of the mobile broadband terminal product, achieve the second-level waterproof effect, save the air duct sealing auxiliary material and the bracket, and save the dust-proof net or the metal dust-proof net which needs to be increased in the appearance of the opening, and reduces the Noise, and light leakage, etc., enhance the user experience.

Claims

A heat dissipating device, the device comprising: a housing, a fan, a first fixing frame for fixing the fan, a first air outlet, and a second air outlet;

The fan is fixed to a bottom plane of the casing by the first fixing bracket, and the second tuyere is located at a side of the bottom plane of the casing to fix the first fixing bracket. The first tuyere is located on the other side of the bottom plane of the housing.
The apparatus according to claim 1, wherein an outer portion of a bottom plane of said housing is provided with a spacer, said spacer separating said second tuyere from said first tuyere at a bottom of said housing Both sides of the plane.
The apparatus of claim 1 wherein the plane of the housing other than the bottom plane is a sealing surface.
The device according to claim 1, wherein the inside of the housing is provided with a second fixing bracket, and the second fixing bracket fixes a vertical main board between the first tuyere and the second tuyere.
The apparatus according to claim 4, wherein a vent hole is provided at a top end of said second holder relative to a bottom plane of said housing.
The device according to claim 1, wherein an upper surface of the bottom plane of the casing is provided with a heat insulating plate, and the top end of the heat insulating plate is fixed to a lower surface of the horizontally disposed main board, and the second surface of the main board is fixed Vents are provided on the mounting bracket.
The apparatus of claim 1 wherein the fan is an axial fan or a centrifugal fan.