1. A heat dissipating device, comprising:

the heat pipe (10) is a long strip-shaped hollow pipe body, the interior of the heat pipe (10) is vacuumized and implanted with a liquid working medium, and the inner wall surface of the heat pipe (10) is provided with a capillary structure;

the heat radiating fin group (20) comprises a plurality of heat radiating fins (21) which are stacked mutually;

each heat dissipation fin (21) comprises a main body part (212) and a connecting part (214) formed by extending the main body part (212), the main body parts (212) of two adjacent heat dissipation fins (21) are arranged oppositely and at intervals, an air channel (215) is formed between the two adjacent main body parts (212), and the connecting part (214) forms a through hole (22);

a storage area (23) is formed on the inner wall surface of each through hole (22);

the combination medium (30) is arranged in the storage area (23), the outer wall surface of the heat pipe (10) is combined with the inner wall surface of the through hole (22), the combination medium (30) fixes the radiating fins (21) and the heat pipe (10) integrally, and the combination medium (30) has heat conduction performance;

the reservoir region (23) is formed over the entire length of the inner wall surface of the through-hole (22) in the circumferential direction.

2. The heat dissipating device as claimed in claim 1, wherein the storage region (23) is located at a stacking combination position of two adjacent heat dissipating fins (21), and the combination medium (30) integrally fixes the two adjacent heat dissipating fins (21).

3. The heat sink according to claim 1, wherein the storage region (23) is a chamfered structure formed by recessing a connection portion (214) of the main body portion (212) in a radial direction of the through hole (22).

4. The heat sink according to claim 1, wherein the storage region (23) is formed by bending an end of the connecting portion (214) away from the main body portion (212).

5. The heat sink according to claim 3 or 4, wherein the storage region (23) defines a connection surface (231), and the connection surface (231) is linear in cross section along a plane in which an axis of the through hole (22) is located.

6. The heat sink according to claim 3 or 4, wherein the storage region (23) defines a connection surface (231), and the connection surface (231) has an arc-shaped cross section along a plane in which an axis of the through hole (22) is located.

7. The heat sink as claimed in claim 5, characterized in that the connection surface (231) forms an angle Ɵ with a plane perpendicular to the axial direction of the through-hole (22)₁An included angle Ɵ is formed between the connecting surface (231) and the outer wall surface of the heat pipe (10)₂Said Ɵ₁And Ɵ₂No less than 30 degrees and no greater than 60 degrees.

8. The heat sink according to claim 6, wherein an angle Ɵ is formed between a tangent of one end of the connection surface (231) and a plane perpendicular to the axial direction of the through hole (22)₁An included angle Ɵ is formed between the tangent line at the other end of the connecting surface (231) and the outer wall surface of the heat pipe (10)₂Said Ɵ₁And Ɵ₂No less than 30 degrees and no greater than 60 degrees.

9. The heat sink according to claim 3 or 4, wherein the length of the storage region (23) on the outer circumferential surface of the heat pipe (10) in the axial direction of the through-hole (22) is L1, the length of the connection portion (214) on the outer circumferential surface of the heat pipe (10) is L2, and L1/L2 is not less than 0.3 and not more than 0.6.

10. The heat sink as recited in claim 1, characterised in that the heat fins (21) are made of copper; or the radiating fins (21) are made of aluminum and the through holes (22) are attached to the inner wall surface of the heat pipe (10) and plated with nickel.

11. A method of assembling a heat sink comprising the heat sink of any one of claims 1 to 10, wherein: the combination method comprises the following steps:

step A: stacking and combining a plurality of the radiating fins (21);

and B: filling a bonding medium (30) in the storage area (23) of the radiating fin (21);

and C: combining the outer wall surface of the heat pipe (10) with the inner wall surface of the through hole (22) of the heat radiation fin (21);

step D: and heating the bonding medium (30) to a melting point, and after the bonding medium (30) is cooled, manufacturing the heat dissipation device in which the heat pipe (10) is tightly bonded with the heat dissipation fins (21).

Background

With the development of science and technology, computers are updated more and more quickly, and heat generated by computer heat sources is more and more, so that the requirements on heat dissipation devices are higher and higher.

Conventional heat dissipation devices generally include a heat pipe and a plurality of heat dissipation fins, wherein one end of the heat pipe is thermally connected to a heat source, and the other end of the heat pipe is connected to the heat dissipation fins. At present, the common combination method of the heat pipe and the radiating fin mainly comprises two methods that the heat pipe is directly lapped on the surface of the radiating fin or the radiating fin is perforated so that the heat pipe can penetrate into the radiating fin. The latter not only punches (convex hull) on the radiating fin, but also forms a tin injection hole near the punching position, and tin paste can be injected into the tin injection hole, but the contact area of the heat pipe and the radiating fin can be reduced, and the radiating area of the radiating fin can also be reduced, so that the radiating effect is greatly reduced.

Disclosure of Invention

The invention aims to provide a novel heat dissipation device and a combination method thereof, and aims to solve the problem that the heat dissipation effect of the existing electronic device is poor.

The technical scheme provided by the invention for solving the technical problems is as follows:

a heat dissipation device comprises a heat pipe and a long strip-shaped hollow pipe body, wherein the interior of the heat pipe is vacuumized and implanted with a liquid working medium, and the inner wall surface of the heat pipe is provided with a capillary structure; the radiating fin group comprises a plurality of radiating fins which are stacked mutually; each radiating fin comprises a main body part and a connecting part formed by extending the main body part, the main body parts of two adjacent radiating fins are arranged oppositely and at intervals, an air channel is formed between the two adjacent main body parts, and the connecting part forms a through hole; a storage area is formed on the inner wall surface of each through hole; and the combination medium is arranged in the storage area, the outer wall surface of the heat pipe is combined with the inner wall surface of the through hole, the combination medium fixes the radiating fins and the heat pipe, the combination medium has heat conduction performance, and the storage area is formed on the inner wall surface of the through hole in the full length of the circumferential direction.

Further, the storage area is located at the stacking and combining position of two adjacent heat dissipation fins, and the combining medium integrally fixes the two adjacent heat dissipation fins.

Furthermore, the storage area is a chamfer structure formed by the connection part of the main body part and the connecting part along the radial direction of the through hole in a concave mode.

Furthermore, the storage area is formed by bending one end of the connecting part, which is far away from the main body part.

Furthermore, the storage area is defined with a connecting surface, and the cross section of the connecting surface along the plane of the axis of the through hole is linear.

Furthermore, the storage area is defined with a connecting surface, and the section of the connecting surface along the plane where the axis of the through hole is located is of an arc line shape.

Further, an included angle Ɵ is formed between the connecting surface and a plane perpendicular to the axial direction of the through hole₁The connecting surface and the outer wall surface of the heat pipe form an included angle Ɵ₂Said Ɵ₁And Ɵ₂No less than 30 degrees and no greater than 60 degrees.

Further, an included angle Ɵ is formed between a tangent line of one end of the connecting surface and a plane perpendicular to the axial direction of the through hole₁An included angle Ɵ is formed between the tangent line at the other end of the connecting surface and the outer wall surface of the heat pipe₂Said Ɵ₁And Ɵ₂No less than 30 degrees and no greater than 60 degrees.

Further, in the axial direction of the through hole, the length of the storage area on the outer peripheral surface of the heat pipe is L1, the length of the connecting part on the outer peripheral surface of the heat pipe is L2, and the L1/L2 is not less than 0.3 and not more than 0.6.

Further, the heat dissipation fins are made of copper; or the radiating fins are made of aluminum and the through holes are attached to the inner wall surface of the heat pipe and plated with nickel.

The invention also discloses the following technical scheme:

a method for assembling a heat dissipation device comprises the following steps:

step A: stacking and combining a plurality of the radiating fins;

and B: filling a combination medium in the storage area of the radiating fin;

and C: combining the outer wall surface of the heat pipe with the inner wall surface of the through hole of the radiating fin;

step D: and heating the combination medium to a melting point, and after the combination medium is cooled, manufacturing the heat dissipation device with the heat pipe tightly combined with the heat dissipation fins.

The invention has the beneficial effects that:

compared with the prior art, the heat dissipation device can increase the effective contact area between the heat pipe and the heat dissipation fins, improves the heat dissipation effect and has a good fixing effect.

Drawings

The invention will be further explained with reference to the figures and examples.

Fig. 1 is a perspective view of the heat dissipation device of the present invention.

Fig. 2 is a perspective view of the heat dissipating fin set shown in fig. 1.

Fig. 3 is a front view of the set of heat dissipating fins of fig. 2.

Fig. 4 is a cross-sectional view taken along line a-a of fig. 3.

FIG. 5 is an enlarged view of the structure indicated by the circle B in FIG. 4, with hatching omitted from the storage region for angle indication.

Fig. 6 is a second embodiment of the storage region of the cooling fin set shown in fig. 4.

Fig. 7 is a third embodiment of a storage area of the cooling fin set shown in fig. 4.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In order to explain the technical means of the present invention, the following description will be given by way of specific examples.

Referring to fig. 1 to 5, a first embodiment of a heat dissipation device of the present invention is shown, and the first embodiment is a preferred embodiment of the present application. The heat dissipation device comprises a heat pipe 10 and a long strip-shaped hollow pipe body, wherein the interior of the heat pipe 10 is vacuumized and implanted with a liquid working medium, and the inner wall surface of the heat pipe 10 is provided with a capillary structure; a heat radiation fin group 20 including a plurality of heat radiation fins 21 stacked on each other, each heat radiation fin 21 having a through hole 22, the heat radiation fin 21 passing through the heat pipe 10 through the through hole 22, and the inner wall surface of each through hole 22 forming a storage area 23 along the entire length of the circumferential direction; and the combination medium 30 is arranged in the storage area 23, the outer wall surface of the heat pipe 10 is combined with the inner wall surface of the through hole 22, the combination medium 30 fixes the radiating fin 21 and the heat pipe 10, and the combination medium 30 has heat conduction performance. The heat pipe 10 is L-shaped and has an evaporation end and a condensation end. The evaporation end of the heat pipe 10 is connected to the heat sink 21, and the condensation end is connected to the heat source of the electronic component. The tube body of the heat pipe 10 may be made of copper or aluminum, which has a hollow cavity, and a capillary structure and a working fluid are disposed in the hollow cavity, wherein the capillary structure is made of metal mesh or fiber bundle.

Referring to fig. 4, the bonding medium 30 is solder paste, and the solder paste can be uniformly applied to the storage area 23; the heat dissipation fins 21 are divided into plate-shaped main body portions 212 and connection portions 214 formed by extending the main body portions 212, the main body portions 212 of two adjacent heat dissipation fins 21 are arranged oppositely and at intervals, an air channel 215 is formed between two adjacent main body portions 212, so that air circulates between the main body portions 212, the heat dissipation effect is good, and the connection portions 214 form through holes 22. Each of the heat dissipating fins 21 may be made of a material having a good thermal conductivity, such as copper or aluminum, but when the heat dissipating fins 21 are made of aluminum, the heat dissipating fins 21 need to be surface-treated: the inner wall surface of the heat dissipation fin 21, which is positioned at the through hole 22 and is attached to the heat pipe 10, is plated with a layer of nickel, so that solder paste can be better attached to the heat dissipation fin 21.

In the first embodiment, as shown in fig. 5, the storage area 23 and the heat dissipation fins 21 form a connection surface 231, the connection surface 231 is linear along the section of the plane of the axis of the through hole 22, and the storage area 23 is formed around the outer ring of the heat pipe 10. The storage area 23 is a chamfered structure formed at the connection position of the main body portion 212 and the connection portion 214 along the radial direction of the through hole 22, so that two included angles are formed between the storage area 23 and the connection surface 231, and an included angle Ɵ is formed between the connection surface 231 and a plane perpendicular to the axial direction of the through hole 22₁An included angle Ɵ is formed between the connection surface 231 and the outer wall surface of the heat pipe 10₂Along the axial direction of the through hole 22, the length of the storage area 23 on the outer circumferential surface of the heat pipe 10 is L1, and the length of the heat dissipation fin 21 on the outer circumferential surface of the heat pipe 10 is L2, when Ɵ₁And Ɵ₂The heat pipe 10 and the radiating fins 21 are not less than 30 degrees and not more than 60 degrees, the ratio of L1/L2 is not less than 0.3 and not more than 0.6, the effective contact area of the heat pipe 10 and the radiating fins 21 is large, the bonding strength between the heat pipe 10 and the radiating fins 21 is optimal, and the achieved radiating effect is good.

It should be noted that, since the thermal conductivity of copper is much higher than that of tin, the position of the storage region 23 needs to be considered when designing the welding position of the heat pipe 10 and the heat dissipation fin 21. In the design of the present application, the storage area 23 is formed into a circle to ensure the bonding strength between the heat pipe 10 and the heat dissipating fins 21, and at the same time, the heat transfer between the heat pipe 10 and the heat dissipating fins 21 can be as uniform as possible; in addition, the gap between the inner wall surface of the through hole 22 except the storage area 23 and the outer wall surface of the heat pipe 10 can be designed to be as small as possible, a small amount of the bonding medium 30 is absorbed by a capillary phenomenon to realize bonding (namely, the thickness of the bonding medium 30 in the gap is reduced by reducing the gap), and thus the heat conduction performance between the inner wall surface of the through hole 22 except the storage area 23 and the outer wall surface of the heat pipe 10 is improved; at the same time, only a small amount of the bonding medium 30 is drawn out of the storage region 23 by capillary action without causing a large void in the storage region 23, which further improves the thermal conductivity. The application is verified by multiple experiments, Ɵ₁And Ɵ₂The angle range of (a) and the ratio range of L1/L2 are within the above range (the heat pipe 10 and the radiator fin 21 have sufficient bonding force, and the heat pipe 10 and the radiator fin 21 have a higher level of heat conduction performance, and the heat transfer between the heat pipe 10 and the radiator fin 21 is more uniform). Specifically, the heat dissipation device forms a storage area 23 between at least two heat dissipation fins 21, solder paste is first poured into the storage area 23 by a tin pouring method, and then the condensation end of the heat pipe 10 passes through the through hole 22 of the heat dissipation fin set 20, so that the heat dissipation fins 21 are combined with the heat pipe 10. When the soldering operation starts, the solder paste in the storage area 23 melts due to high temperature, and flows into the gap between the heat pipe 10 and the through hole 22 of the heat sink fin 21 due to capillary force and gravity, so that the heat pipe 10 and the heat sink fin 21 are connected and fixed with each other through the solder paste.

Referring to fig. 6, unlike the first embodiment, the storage area 23 is formed by bending one end of each connecting portion 214 away from each main body portion 212. Similarly, as in the first embodiment, the solder paste is placed in the storage area 23 by a solder dispensing manner, and is melted by high temperature, and the heat dissipation fins 21 and the heat pipe 10 are connected by capillary action and gravity, so that the contact area between the heat dissipation fins and the heat pipe is increased, and the overall heat dissipation effect is improved.

Referring to fig. 7, unlike the first and second embodiments, the connecting surface 231 has an arc-shaped cross section along the plane of the axis of the through-hole 22, and an included angle Ɵ is formed between the tangent line at one end of the connecting surface 231 and the plane perpendicular to the axial direction of the through-hole 22₁An included angle Ɵ is formed between the tangent line at the other end of the connection surface 231 and the outer wall surface of the heat pipe 10₂，Ɵ₁And Ɵ₂No less than 30 degrees and no greater than 60 degrees. During soldering, the solder paste flows and fills the gap between the heat pipe 10 and the through hole 22 of the heat sink fin 21 by capillary force and gravity after being melted at high temperature.

Specifically, after the solder paste is cooled, a solder layer 213 is formed between the heat pipe 10 and the through hole 22 of the heat sink 21, and the heat pipe 10 and the heat sink 21 are tightly bonded together through the solder layer 213.

According to the heat dissipation device, the storage area is arranged between at least two adjacent heat dissipation fins, the combination medium is arranged in the storage area, and when welding is carried out, the fused combination medium flows to the outer surface of the heat pipe rapidly under the action of capillary force and gravity through high-temperature fusion, so that the outer surface of the heat pipe and the heat dissipation fins are connected with each other, the contact is more sufficient, no-welding is not easy to form, and the heat dissipation effect of the heat dissipation device is further improved.

The heat sink disclosed by the invention also has a combination method, which comprises the following steps:

step A: stacking and combining a plurality of radiating fins 21;

and B: filling the storage region 23 of the heat sink 21 with a bonding medium 30;

and C: combining the outer wall surface of the heat pipe 10 with the inner wall surface of the through hole 22 of the heat radiation fin 21;

step D: the bonding medium 30 is heated to a melting point, and after the bonding medium 30 is cooled, the heat sink with the heat pipe 10 tightly bonded to the heat dissipation fins 21 is manufactured.

It should be noted that the through hole 22 in the present application is not particularly limited to a cylindrical through hole, but may be a through hole of other shapes, such as: rectangular parallelepiped shape, polygonal shape, and the like.

In addition, the through holes 22 in the present application may also be formed at the edge positions of the heat dissipation fins 21. For example, the through holes 22 may be designed as through groove structures (not shown) that are open at one side in the stacking direction of the radiator fins 21 and penetrate in the stacking direction of the radiator fins 21. In this embodiment, the heat pipe 10 can be directly assembled into the through hole 22 from the opening position of the through hole 22 from one side of the stacking direction of the heat dissipation fins 21, and the inner wall surface of the through hole 22 is only combined with one half of the outer wall surface of the heat pipe 10, so that two heat dissipation fin sets 20 can be designed and the heat pipe 10 can be clamped along the radial direction of the heat pipe 10 to achieve the combination.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.