WO2013016998A1

WO2013016998A1 - Fin-type heat dissipation device

Info

Publication number: WO2013016998A1
Application number: PCT/CN2012/078097
Authority: WO
Inventors: 丁德亮
Original assignee: 深圳亚锐光电科技有限公司
Priority date: 2011-08-01
Filing date: 2012-07-03
Publication date: 2013-02-07
Also published as: CN202282388U

Abstract

A fin-type heat dissipation device, comprising a base (20), an upper heat equalizing plate (10), a lower heat equalizing plate (50), a plurality of fins (30) and a plurality of hot pipes (40); the base (20) is tubular; the upper heat equalizing plate (10) and the lower heat equalizing plate (50) are respectively fixed at the two ends of the base (20); the fins (30) are fixedly connected to the outer wall of the base (20), and are distributed circumferentially along the outer wall of the base (20); the two ends of the fins (30)are in contact with the upper heat equalizing plate (10) and the lower heat equalizing plate (50)respectively; the two ends of the fins are provided with a flanged edge (32) at the positions in contact with the upper heat equalizing plate (10) and the lower heat equalizing plate (50); the flanged edge (32) presses against the upper heat equalizing plate (10) or the lower heat equalizing plate (50); the fins (30) are stamp-molded; the inner wall of the base is circumferentially provided with a plurality of grooves (21) ; the hot pipes (40) are L-shaped or U-shaped; the hot pipes (40) are fixed in the grooves (21) on the inner wall of the base, and press against the wall surfaces of the grooves; and the ends of the hot pipes (40) closely press against the upper heat equalizing plate (10).

Description

Finned radiator

The utility model relates to a heat dissipation device, in particular to a fin type heat sink. Background technique

Due to its small size and low energy consumption, LEDs are widely used in automotive, traffic signal indication, screen display and lighting. With the development of application requirements, there is an increasing demand for the power of LED lamps, but high-power LEDs have a problem of high heat generation.

It does not affect the illuminating quality and life, and it is necessary to dissipate the heat in time. The existing heat sink often adopts a plate-shaped base and a plurality of fins arranged on the base, and the LED is mounted on the other side of the plate-shaped base opposite to the fin, and the fin-type heat sink is an LED. For heat dissipation, such heat sinks are often made of copper die-cast or aluminum extrusion. Due to the limitation of the processing technology, such heat sinks have the disadvantages of heavy mass waste materials, and the thickness of the fins is relatively large, which affects the heat dissipation efficiency. Utility model content

The technical problem mainly solved by the utility model is to provide a fin type heat sink with light weight and high heat dissipation efficiency.

In order to solve the above technical problem, a technical solution adopted by the present invention is: providing a fin type heat sink, comprising: a base, an upper heat equalizing plate, a lower heat equalizing plate, a plurality of fins, and a plurality of heat pipes; The base is tubular, and the upper and lower heat plates are respectively fixed to the two ends of the base; the fins are fixedly connected with the outer wall of the base, and the fins are circumferentially distributed along the outer wall of the base, and the fins The sheet extends radially from the outer wall of the base, and the two ends of the fin are further in contact with the upper heat equalizing plate and the lower heat equalizing plate, respectively, the two ends of the fin and the upper heat equalizing plate and the lower The portion where the hot plate contacts is provided with a folded edge, the folded edge is attached to the upper heat equalizing plate or the lower heat equalizing plate, and the fin is formed by press forming; the inner wall of the base is provided with a plurality of grooves along the circumferential direction. The heat pipe is L-shaped, one arm of the L-shaped heat pipe is in close contact with the upper heat equalizing plate, and the other arm is fixed in the groove of the inner wall of the base and closely fits the wall surface of the groove.

Wherein, the fin is provided with a plurality of through holes. The fin is provided with a buckle and a card hole on the flange, and the adjacent two fins are connected by the buckle and the card hole.

The fin is soldered and fixed to the outer wall of the base.

Wherein, the material of the fin is aluminum or copper.

Wherein, the material of the base is aluminum or copper.

Wherein, the heat pipe is welded and fixed to the inner wall of the base.

In order to solve the above technical problem, another technical solution adopted by the present invention is: on the basis of the above technical solution, the L-shaped heat pipe is replaced with a U-shaped heat pipe, and the bottom of the U-shaped heat pipe is attached to the upper heat equalizing plate. The other two arms of the U-shaped heat pipe are fixed in the groove of the inner wall of the base and closely fit with the wall surface of the groove.

The utility model has the beneficial effects that: compared with the conventional copper die-casting or aluminum extrusion fin heat sink, in the fin-type heat sink of the present invention, the fins are formed by stamping, and can be made into thin slices. , to reduce the weight of the heat sink, and in the case of the same base, the number of fins can be greatly increased, and the heat dissipation efficiency of the heat sink can be improved; when the heat dissipation efficiency is the same, the heat sink needs less material to be produced. Save material costs and be more environmentally friendly and energy efficient. In the utility model, the heat source is in thermal contact with the upper heat equalizing plate. Since the upper heat equalizing plate is in contact with the fins, the base and the heat pipe, three heat dissipation paths are provided: 1. The heat generated by the heat source passes through the upper heat equalizing plate. Conducted to the flange of the fin, the heat is further transmitted on the fin, and the fin radiates heat; 2. The heat generated by the heat source transmits heat to the susceptor through the upper heat slab, and the pedestal conducts heat to the fin The heat generated by the heat source is transmitted to the heat pipe through the upper heat equalizing plate, and the heat pipe conducts the heat to the susceptor, and the heat of the pedestal is further cooled by the fins. The lower heat equalizing plate is in contact with the fin and the base, and in addition to supporting the function, it can also serve as a heat dissipating component, and the heat conducted from the fin and the base is radiated outward, due to the lower heat plate and the heat source. The farthest distance, therefore, also has a better heat dissipation effect; in addition, a heat source can also be installed at the lower heat equalizing plate end, so that the heat sink can simultaneously dissipate heat for two heat sources. Compared with the prior art heat sink, the finned heat sink of the present invention provides more heat conduction paths, and uses a heat pipe with excellent thermal conductivity as a heat dissipating component, which greatly improves heat dissipation efficiency. The finned heat sink of the present invention is suitable for heat dissipation of high-power LEDs, especially LEDs with a power of more than 100W. DRAWINGS

1 is a perspective view of a finned heat sink of the present invention;

2 is an exploded perspective view of the finned heat sink of the present invention;

3 is a top plan view of the finned heat sink of the present invention;

Figure 4 is a side view of the finned heat sink of the present invention;

Figure 5 is a partial enlarged view of A in Figure 2;

Figure 6 is a partial enlarged view of B in Figure 2.

In the figure: 10, upper heat plate; 20, base; 21, groove; 22, raised structure; 30, fin; 31, through hole; 32, folded edge; 33, buckle; 34, card hole 40, heat pipe; 50, under the hot plate. detailed description

The detailed description of the technical contents, structural features, and the objects and effects of the present invention will be described in detail below with reference to the embodiments.

Referring to FIG. 1 to FIG. 6 , the present invention relates to a fin type heat sink, comprising a base 20 , an upper heat equalizing plate 10 , a lower heat equalizing plate 50 , a plurality of fins 30 , and a plurality of heat pipes 40 ; The base 20 is tubular, and the upper heat equalizing plate 10 and the lower heat equalizing plate 50 are respectively fixed to both ends of the base 20. In the embodiment shown in FIG. 2, the upper heat equalizing plate 10 and the lower heat equalizing plate 50 are provided. Both the base heatsink 10 and the lower heatsink 50 are fixed to the base 20 by other fixing means such as welding, snapping, and the like.

The fins 30 are fixedly connected to the outer wall of the base 20, the fins 30 are circumferentially distributed along the outer wall of the base 20, and the fins 30 extend radially from the outer wall of the base 20, from the view of FIG. In the above view, the fins 30 are distributed in a divergent manner around the susceptor 20, and both ends of the fins 30 are also in contact with the upper and lower heat equalizing plates 10 and 50, respectively, as shown in FIG. The portion where the end portion is in contact with the upper heat equalizing plate 10 is provided with a folded edge 32, and the folded edge 32 is adhered to the upper heat equalizing plate 10 to increase the contact area between the fin 30 and the upper heat equalizing plate 10, and the heat is reduced. Similarly, a portion where the other end portion of the fin 30 is in contact with the lower heat equalizing plate 50 is also provided with a folded edge, and the folded edge is bonded to the lower heat equalizing plate, and the structure of the folded edge at both ends of the fin 30 is the same. The illustration is omitted; the fins 30 are formed by press molding. As shown in FIG. 2 and FIG. 5, the inner wall of the base 20 has a plurality of convex structures 22 in the circumferential direction, and a groove 21 is formed between the convex structures 22, and the groove 21 is matched with the heat pipe 40; One arm of the L-shaped heat pipe 40 is in close contact with the upper heat equalizing plate 10, and the other arm is fixedly disposed in the groove 21 of the inner wall of the base 20 and closely fits the wall surface of the groove 21. In another embodiment, the heat pipe 40 may be U-shaped. The U-shaped heat pipe is composed of two L-shaped heat pipes. The bottom of the U-shaped heat pipe is attached to the upper heat equalizing plate 10, and the other two arms of the U-shaped heat pipe. It is fixed in the groove 21 of the inner wall of the base 20 and is in close contact with the wall surface of the groove 21. In both embodiments, the heat pipe 40 is in surface contact with the upper heat equalizing plate 10 and the susceptor 20, has a large contact area, reduces thermal resistance, and facilitates heat conduction.

Compared with the conventional copper die-casting or aluminum-extruded fin heat sink, in the fin-type heat sink of the present invention, the fins 30 are formed by stamping, and can be made into a thinner sheet to reduce the weight of the heat sink. Moreover, in the case where the susceptor 20 is the same, the number of the fins 30 can be greatly increased, and the heat dissipation efficiency of the heat sink can be improved. When the heat dissipation efficiency is ensured to be the same, the heat sink can be made with less material and material cost. More environmentally friendly and energy efficient. In the present invention, the heat source is in thermal contact with the upper heat equalizing plate 10, and the upper heat equalizing plate 10 uniformly disperses heat thereon, since the upper heat equalizing plate 10 is in contact with the fins 30, the base 20, and the heat pipe 40. Therefore, three heat dissipation paths are provided: 1. The heat generated by the heat source is conducted to the folded edge 32 of the fin 30 through the upper heat equalizing plate 10, and the heat is further conducted on the fin 30, and the fin 30 radiates heat; The heat generated by the heat source transmits heat to the susceptor 20 through the upper heat equalizing plate 10, and the susceptor 20 conducts heat to the fins 30 to dissipate heat; 3. The heat generated by the heat source transmits heat to the heat pipe through the upper heat equalizing plate 10. 40, the heat pipe 40 conducts heat to the susceptor 20, and the heat of the susceptor 20 is further assisted by the fins 30 to dissipate heat. The lower heat equalizing plate 50 is in contact with the fins 30 and the susceptor 20, and in addition to supporting the function, it can also serve as a heat dissipating component, and the heat conducted from the fins 30 and the susceptor 20 is radiated outward, due to the lower The hot plate 50 has the farthest distance from the heat source, so it also has a better heat dissipation effect; in addition, a heat source can also be installed on the lower heat equalizing plate 50 end, so that the heat sink can simultaneously dissipate heat for the two heat sources. Compared with the prior art heat sink, the finned heat sink of the present invention provides more heat conduction paths, and uses a heat pipe with excellent thermal conductivity as a heat dissipating component, which greatly improves heat dissipation efficiency. The finned heat sink of the present invention is suitable for heat dissipation of high-power LEDs, especially LEDs with power above 100W. The heat pipe used in the heat sink of the present invention is a heat transfer element that realizes heat transfer by means of a phase change of its internal working liquid. The heat pipe is composed of a tube shell, a liquid absorbing core and an end cover, and the working liquid absorbs heat and evaporates and flows away. The position of the heat source is condensed into a liquid after cooling, and the liquid is returned to the end near the heat source by the capillary force of the wick, and then absorbs heat and evaporates. The heat pipe has extremely high thermal conductivity, excellent isothermality, heat flow density variability, The heat flow direction is excellent in reversibility, constant temperature, and environmental adaptability. In the present invention, the portion of the heat pipe 40 that closely adheres to the upper heat equalizing plate 10 is an evaporation section, and the working liquid in the heat pipe 40 absorbs heat from the upper heat equalizing plate 10, and the heat pipe 40 is fixed to the inner wall of the base 20. For the condensing section, the working fluid is cooled and heat is conducted to the susceptor 20.

In the above embodiment, the heat pipe 40 and the inner wall of the base 20 may be fixed in various ways, and preferably, may be fixed by welding, firmly fixed, and the contact thermal resistance is small.

Referring to FIG. 1, in an embodiment, a plurality of through holes 31 are formed in the fins 30 to increase heat convection and improve heat dissipation efficiency.

Referring to FIG. 6, in an embodiment, the fins 30 are provided with a buckle 33 and a card hole 34 on the flange 32, and the adjacent fins 30 are connected by the buckle 33 and the card hole 34. The fins 30 are formed in a ring structure by the end-to-end connection of the buckle 33 and the card hole 34 on the flange 32 to facilitate assembly of the heat sink.

Preferably, the fins 30 are soldered and fixed to the outer wall of the base 20, and the connection is firm and the thermal resistance is small. Preferably, in the finned heat sink of the present invention, the material of the fin 30 is selected as aluminum or copper with high heat dissipation efficiency, light weight and easy to be stamped, and of course, the heat dissipation efficiency is high, the quality is light, and the press processing is easy. Other materials required may also be used in the present invention.

Preferably, in the finned heat sink of the present invention, the material of the base 20 is also aluminum or copper, which has good heat dissipation efficiency and small mass, and also has sufficient strength to support the entire heat dissipation and is easy to weld. It is convenient to be welded and fixed to the heat pipe 40 and the fins 30.

The above is only the embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Any equivalent structure or equivalent process transformation made by using the specification and the drawings of the present invention may be directly or indirectly applied to other The related technical fields are all included in the scope of patent protection of the present invention.

Claims

Claim

A finned heat sink, comprising: a base, an upper heat equalizing plate, a lower average heat plate, a plurality of fins, and a plurality of heat pipes;

The base is tubular, and the upper and lower heat plates are respectively fixed at both ends of the base;

The fins are fixedly connected to the outer wall of the base, the fins are circumferentially distributed along the outer wall of the base, and the fins extend radially from the outer wall of the base, and the two ends of the fins are respectively connected to the upper portion The heat equalizing plate is in contact with the lower heat equalizing plate, and a portion of the fin portion contacting the upper heat equalizing plate and the lower uniform heat plate is provided with a folded edge, and the folded edge and the upper uniform heat plate or the lower heat are respectively The plate is pasted, and the fin is formed by stamping;

The inner wall of the base is circumferentially disposed with a plurality of grooves; the heat pipe is L-shaped, one arm of the L-shaped heat pipe is in close contact with the upper heat equalizing plate, and the other arm is fixed to the groove of the inner wall of the base It is in close contact with the wall surface of the groove.

2. The finned heat sink according to claim 1, wherein: the fin is provided with a plurality of through holes.

3. The fin heat sink according to claim 1, wherein: the fin is provided with a buckle and a card hole on the flange, and the adjacent two fins are connected by a buckle and a card hole.

4. The finned heat sink according to claim 1, wherein the fin is soldered to the outer wall of the base.

The finned heat sink according to any one of claims 1 to 4, wherein the fin material is aluminum or copper.

6. The finned heat sink according to claim 1, wherein the base material is aluminum or copper.

The finned heat sink according to claim 1, wherein the heat pipe is welded and fixed to the inner wall of the base.

8. The finned heat sink according to claim 1, wherein: the L-shaped heat pipe is replaced with a U-shaped heat pipe, and a bottom of the U-shaped heat pipe is attached to the upper heat equalizing plate, and a U-shaped heat pipe The other two arms are fixed in the recesses of the inner wall of the base and are in close contact with the wall surface of the recess.