JP2001060788A - Plane type improved heat mobile unit heat sink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cooling capability of an improved heat mobile unit by providing a cutout at least at one portion of the middle of a cylindrical body. SOLUTION: A plane type improve heat mobile unit heat sink A is composed of an L-shaped improved heat mobile unit 1, a fin 15 being provided at a heat radiation part 14 of the improve heat mobile unit 1, and a cylindrical body 16 being provided around the fin 15. The projection part of the L-shaped improved heat mobile unit 1 is an electrical heating element mounting part (heat collection part) 12, and the mounting part 12 is the evaporation part of the working liquid of the heat sink or a heat pipe. A cutout 11 is provided at nearly the center of the cylindrical body 16. Fans 17 and 18 are provided at the upper and lower ends of the cylindrical body 16, respectively, thus providing superior cooling capability, effectively cooling electronic equipment or the like for incorporating heat generation electronic parts or the like, miniaturizing the electronic equipment or the like, reducing weight and cost, or achieving high integration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a good heat transfer type heat sink for efficiently transferring heat such as a flat thermosiphon or a flat heat pipe, and more particularly to cooling of a heat sink suitable for radiating heat from a heating element such as an electronic component. This is an improvement in efficiency.

[0002]

2. Description of the Related Art IPM (Intelligent power module)
Electronic components such as IGBTs and IGBTs (Insulated Gate Bipolar Transistor) generate heat during use, and if they continue to be used in a heat-generating state, their performance deteriorates over time, so they need to be cooled. As shown in FIG. 12, a conventional electronic component is cooled by making a good heat transfer body (hereinafter simply referred to as a good heat transfer body) 1 made of a flat thermosiphon or a flat heat pipe into an L-shape, as shown in FIG.
The downwardly projecting portion (heating element mounting portion) of the character shape is a heating element mounting portion 12 for mounting a heating element 21 such as an electronic component, and the fin 15 extends from the vicinity of the heating element mounting portion 12 to the entire vertical portion (condensing portion) 14. And a heat sink structure in which the fins are surrounded by a cylindrical body 16 and the outside air in the cylindrical body 16 is forcibly circulated by a fan 17 provided above the cylindrical body 16, and a vertical portion, that is, a condensing portion (radiation portion) 14 to cool the heating element mounting portion 12
The heat radiation effect is improved as a configuration for efficiently radiating the heat of the heat generating element 21 attached to the radiator.

A flat thermosyphon seals a working fluid (eg, water, chlorofluorocarbon, etc.) in a flat hermetic container and transfers heat by repeating evaporation and condensation of the working fluid. In addition, the flat heat pipe has a wick provided on a wall surface in a flat airtight container and encloses a working fluid, and the movement of the working fluid by evaporation and condensation is performed by utilizing a capillary phenomenon of the wick. When the heating element is brought into contact with the heating element mounting portion (evaporation section) of such a good heat transfer body, the working fluid evaporates due to the heat from the heating element, and the heating element is cooled by the latent heat of evaporation of the working liquid, while the heating liquid evaporates. The liquefied working fluid is cooled and liquefied in the condenser, and the liquefied working fluid returns to the evaporator again. By repeating such a cycle, the heating element is efficiently cooled.

[0004]

In a conventional flat type good heat transfer type heat sink in which the heating element is cooled by circulating the working liquid, the working liquid condensing section (radiation section) 14 of the good heat transfer body 1 is used.
Circulates outside air in the cylindrical body 16 to cool the
Since the outside air enters from below the cylindrical body 16 and escapes upward, the outside air first passes through the high-temperature portion near the heating element mounting portion. For this reason, the outside air is warmed in this high-temperature part, and further moves through the cylindrical body while being heated by the heat radiation of the working fluid in the condensing part, so that it is gradually warmed by the heat from the heating element 21 and moves upward, Therefore, the cooling efficiency becomes worse as it goes upward. In particular, when the length of the vertical portion is long, the air resistance of the air forcibly passing between the fins increases, and the pressure loss increases, so that the wind speed flowing through the cylindrical body decreases, and the cooling effect is significantly reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an outside air inlet or / and / or the like is provided at an intermediate portion of a cylindrical body.
Alternatively, by providing an exhaust port, and by dispersing the intake of outside air or the discharge of gas in the cylindrical body to a plurality of locations, particularly in the unheated outside air, the heat of the heat radiating portion is effectively eliminated, and the heat radiation effect is improved. An object of the present invention is to provide a flat-type good heat transfer type heat sink. In addition, the length of the radiating fin in the direction in which the wind flows is shorter than the entire length of the radiating portion to reduce the pressure loss in the cylindrical body, thereby improving the heat radiation effect. It is another object of the present invention to provide a flat-type heat-transfer-type heat sink in which the discharge of gas is dispersed to a plurality of locations and the heat radiation effect is improved by shortening the entire length of the heat radiation section.

[0006]

That is, according to the present invention, a radiating fin is provided from the vicinity of a heating element mounting portion of a good heat transfer body comprising a flat thermosiphon or a flat heat pipe to a condensing portion (radiating portion). A tubular body is provided so as to surround the finned good heat transfer body, and in a flat type good heat transfer body type heat sink that cools the good heat transfer body by taking in outside air into the tubular body, an intermediate portion of the tubular body is provided. A flat type good heat transfer body type heat sink characterized in that at least one cutout portion is provided to improve the cooling efficiency of the good heat transfer body.

If a fan is provided at at least one open end of the tubular body or a fan is provided at a cut-out portion in the middle of the tubular body to forcibly circulate the airflow in the tubular body, the cooling efficiency is further improved. improves.

Further, if a fan is provided in at least one opening end of the cylindrical body and a cutout in the middle of the cylindrical body, the outside air not heated from the cutout can be removed from the middle of the cylindrical body. The gas can be taken in and supplied to both ends, or the warmed gas can be forcibly discharged from the middle part, and the cooling time can be effectively controlled by shortening the time that the outside air stays in the cylindrical body.

Further, according to the present invention, a radiating fin is provided from the vicinity of the heating element mounting portion to the condensing portion (radiating portion) of the good heat transfer member comprising a flat thermosiphon or a flat heat pipe. In a flat type good heat transfer body type heat sink in which a cylindrical body is provided so as to surround the body and cools the condensing portion of the good heat transfer body by taking in outside air into the cylindrical body, the length of the radiating fin in the direction of air flow Is shorter than the entire length of the condensing section, and is disposed so as to be shifted toward the condensing section. The cooling effect is improved by being located closer to the condensing section. In the present invention, further effects can be expected by appropriately combining the above-described inventions.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a heat sink of the present invention. In the drawings, the same portions are denoted by the same reference numerals. FIG. 1 is a perspective view showing a first embodiment of a flat type good heat transfer type heat sink of the present invention, wherein A is a flat type good heat transfer type heat sink of the present invention, and the heat sink A is an L-shaped good heat transfer type 1. And a fin 1 provided on the heat radiating portion 14 of the good heat transfer body 1.
5 and a cylindrical body 16 provided so as to surround the fins 15, and the protruding portion of the L-shaped good heat transfer body 1 is a heating element mounting portion (heat collecting portion) 12, and the mounting portion 12 is a heat sink. Alternatively, it becomes an evaporating section for the working fluid in the heat pipe. 11 is a cylindrical body 1
6, a notch provided at the center of the cylindrical body 16 in FIG. Reference numeral 17 denotes a fan provided at the upper end of the cylindrical body 16, and reference numeral 18 denotes a fan provided at the lower end of the cylindrical body 16.

FIGS. 2 to 5 show the flow of the outside air in the cylindrical body 16 by arrows. In the embodiment shown in FIG. 2, the lower fan 18 is operated so that the outside air is fed into the cylindrical body. Let it. In this manner, the outside air sent by the fan 18 enters from the lower side of the cylindrical body and lowers the temperature in the vicinity of the heating element mounting portion. Will be released. On the other hand, the fan 17 provided at the upper end of the tubular body 16 is also operated so that outside air is sent into the tubular body. The outside air sent by operating the fan 17 in this manner is not warmed, but descends from the tip of the heat radiating portion 14 having a relatively low temperature to the middle portion having a high temperature. The outside air that has absorbed the temperature of the heat radiating portion up to the middle portion and cooled the heat radiating portion 14, that is, the warmed outside air, is discharged from the cutout portion 11 of the middle portion. As described above, the cooling efficiency is remarkably improved by dividing the outside air sent into the cylindrical body 16 into two.

FIG. 3 shows a fan 1 provided at the lower end of a cylindrical body 16.
8 is operated to send outside air into the cylindrical body in the same manner as the embodiment shown in FIG. 2, and the fan 17 provided at the upper end of the cylindrical body 16 is operated to discharge the outside air from the cylindrical body. In the example, the gas warmed by the heating element mounting part 12 is discarded outside from the middle notch part 11, and the unheated outside air is supplied from the middle notch part 11 to the upper cylindrical body (heat radiating part 14). As a result, the heat radiation efficiency of the upper heat radiation portion 14 is improved, and the overall heat radiation efficiency is also improved.

FIG. 4 shows a fan 1 provided at the lower end of a cylindrical body 16.
8 is an embodiment in which both the fan 17 provided at the upper end of the cylindrical body 16 is operated so as to discharge the outside air in the cylindrical body. When the fan is operated in this manner, the outside air flows upward from the middle cutout 11. Since unheated outside air is supplied into the tubular body and the lower tubular body and is introduced from the middle, the cooling efficiency is improved both vertically and vertically, and the overall heat dissipation efficiency is also improved.

FIG. 5 shows a fan 1 provided at the lower end of a cylindrical body 16.
8 is operated to discharge the outside air in the cylindrical body, and the fan 17 provided at the upper end of the cylindrical body 16 is operated to send the outside air into the cylindrical body. Even so, the heat radiation effect is improved.

The cooling efficiency is improved even if the fan is provided only at the upper or lower end of the cylindrical body and the flow of the outside air in the cylindrical body without the fan is natural convection. Therefore, the number of fans to be installed can be optimally selected in consideration of the amount of heat generated by the heating element 21 and the size of the heat sink. In addition, the position of the cutout portion and whether the number of the cutout portions 11 is one or plural may be selected at the design stage.

FIG. 6 shows a second embodiment in which a control plate 22 for controlling the flow of outside air is provided in the notch 11 in the embodiment shown in FIG. 1. By providing the control plate 22 in the notch 11 in this manner. By providing a configuration in which the flow of the outside air can be appropriately controlled and the angle of the control plate 22 can be appropriately changed, the cooling efficiency can be controlled to a distribution closer to an ideal.

FIG. 7 shows a third embodiment of the present invention. In this embodiment, the fan 19 is located at the notch 11, and thus the fan 19 is located at the notch 11. The position of the outside air is controlled by the position shown in FIG.
And the cooling efficiency is improved. Although FIG. 7 illustrates an example in which only the fan 19 is provided, it is a matter of course that the intake and exhaust of the outside air can be freely designed in combination with the fans 17 and 18 provided at the upper end and / or the lower end described above.

In the above embodiment, the heat sink in which the fins 15 are provided on one side of the good heat transfer body has been described.
As in the fourth embodiment shown in FIG. 9, the fins 15 can be provided on both sides of the good heat transfer body to have a structure for further improving the heat radiation effect. Further, as in the fifth embodiment shown in FIG. In addition, it is also possible to adopt a configuration in which only the cylindrical body 16 is notched at an intermediate portion thereof and the fin 15 is not cut out. It is also possible to combine various embodiments described in detail above to form an efficient heat sink, and it is possible to design the heat sink to an optimum condition as appropriate depending on the installation location of the heat sink, the heat generating capacity and the size of the heat generating element, and the like.

[0019]

Embodiment 1 A good heat transfer body has a vertical part width of 120 m.
m, a length of 270 mm, a width of a protruding portion (heating element mounting portion) of 93.5 mm, a length of 109 mm, and a fin provided on one side of a flat thermosyphon having a length of 109 mm, and the fin was surrounded as shown in FIG. A heat sink configured to introduce outside air from the middle cutout portion of the cylindrical body was prepared, and a 250 W
And a heating element of 450 W were attached, and the cooling efficiency was measured.

[0020]

COMPARATIVE EXAMPLE 1 An L-shaped heat-transfer body having the same specifications as in Example 1 (vertical portion width: 120 mm, length: 270 mm, projecting portion (heating element mounting portion) width: 93.5 mm, length: 109 mm) Good heat transfer body with fins on one side of a flat thermosyphon
A conventional heat sink having a cylindrical body surrounding the fins as shown in FIG. 12 and a fan provided below the cylindrical body was prepared, and a heating element of 250 W and 450 W was attached to the heating element mounting portion. The cooling efficiency was measured. Table 1 shows the measurement results of the temperature of each part of the heat sink in Example 1 and Comparative Example 1. As is clear from Table 1, the heat efficiency of the heat sink of the present invention is improved by 18% to 23% as compared with the conventional heat sink.

[0021]

[Table 1] Temperature of each part of heating element and heat sink (℃)

As described above, the heat sink of the present invention
Cut out the middle part of the cylindrical body surrounding the good heat transfer body, release the warmed gas in the cylindrical body from the notch, or take in the unheated outside air to cool the good heat transfer body. The configuration makes it possible to improve the cooling efficiency and efficiently radiate heat of electronic devices incorporating heat-generating electronic components and the like. Therefore, it is extremely excellent that the electronic devices can be downsized or highly integrated. This has the effect.

Next, FIG. 10 shows a sixth embodiment of the present invention. In this embodiment, the notch 11 is provided in the middle of the cylindrical body 16 in the first to fifth embodiments. Instead, the length of the fins is shortened and the wind speed of the outside air for cooling the fins is increased, that is, the air flow is increased to improve the cooling effect. In FIG. 10, the length of the fin 15 in the direction in which the outside air flows is shorter than the entire length of the condensing section (heat radiating section) 14, and the terminal on the side of the heating element mounting section 12 is located closer than the center of the heating element mounting section 12. It is provided so as to be located on the upper side. In this way, by shortening the entire length of the fin, and by positioning the terminal on the side of the heating element mounting portion 12 above the center of the heating element mounting portion 12, the introduction of the outside air by the fan 17 causes the air resistance of the fin 15 to be reduced. However, as the fins are shorter, the fins 15 have a smaller pressure loss, that is, the pressure loss due to the fins 15 is smaller, so that the wind speed is increased.

According to claim 6, the heating element mounting portion 12 of the fin 15 is provided.
The reason why the terminal on the side was positioned above the condensing portion from the center of the heating element mounting portion 12 is based on the experimental results shown in Example 2 below.

[Embodiment 2] The width of the vertical portion is 120 m as a good heat transfer body.
m, a length of 280 mm, a width of a protruding portion (heating element mounting portion) of 90 mm, a length of 100 mm, and a fin (fin pitch 4 mm, fin length 210
mm), as shown in FIG. 11 (a), the lower end thereof is located slightly above the center of the heating element mounting section (heat collecting section), that is, located above the condensing section from the center of the heating element mounting section. And the cylindrical body surrounding the fin was mounted. Heating element mounting part (heat collecting part) of heat sink configured in this way
, A heating element of 400 W was attached thereto, and its cooling efficiency was measured.

[0025]

Comparative Example 2 A fin (fin pitch: 4 mm, fin length: 250 mm) was attached to one side of an L-shaped flat thermosyphon having the same size as that of Example 2 as shown in FIG. The tube was mounted so as to be slightly below the center of the portion, and a cylindrical body surrounding the fin was mounted. A 400 W heating element was attached to the heating element attachment portion of the heat sink thus configured, and its cooling efficiency was measured.

[0026]

COMPARATIVE EXAMPLE 3 A fin (fin pitch: 4 mm, fin length: 280 mm) is provided on one side of an L-shaped flat thermosyphon having the same size as that of the embodiment 2, as shown in FIG. And a cylindrical body surrounding the fins. A 400 W heating element was attached to the heating element attachment portion of the heat sink thus configured, and its cooling efficiency was measured.

In Example 2, Comparative Examples 2 and 3, a fan 17 was used.
Was provided at the upper end of the cylindrical body 16 and outside air was forcibly sent into the cylindrical body, and the thermal resistance was measured. Table 2 shows the results.

[Table 2] As shown in Table 2, the heat sink of the present invention exhibited excellent thermal performance.

According to the present invention, as described above, the length of the radiating fins in the direction in which the wind flows is shorter than the entire length of the condensing portion, and the radiating fins are shifted above the condensing portion. Therefore, the cooling efficiency is improved by increasing the amount of air flow, and the temperature of the upper part of the condensing part is higher than that of other parts. Therefore, the present invention has extremely excellent effects such as reduction in size, weight, cost, and high integration of electronic devices and the like.

The present invention has optimum thermal efficiency by designing the combination of the position of the cutout portion provided in the tubular body, the number of cutout portions, the number and position of the fans, and the length of the fins as appropriate. A heat sink can be provided.

[0030]

The heat sink of the present invention is excellent in cooling efficiency, can efficiently radiate heat of electronic equipment incorporating heat-generating electronic parts, etc., and can reduce the size, weight, cost, or cost of electronic equipment. It has extremely excellent effects such as being able to be integrated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a heat sink of the present invention.

FIG. 2 is an explanatory diagram showing an airflow in a heat sink of the present invention.

FIG. 3 is an explanatory view showing an airflow in the heat sink of the present invention.

FIG. 4 is an explanatory diagram showing an airflow in the heat sink of the present invention.

FIG. 5 is an explanatory diagram showing an airflow in the heat sink of the present invention.

FIG. 6 is a perspective view showing a second embodiment of the heat sink of the present invention.

FIG. 7 is a perspective view showing a third embodiment of the heat sink of the present invention.

FIG. 8 is a perspective view showing a fourth embodiment of the heat sink of the present invention.

FIG. 9 is a perspective view showing a fifth embodiment of the heat sink of the present invention.

FIG. 10 is a perspective view showing a sixth embodiment of the heat sink of the present invention.

FIG. 11A is an explanatory view showing a fan attachment position in a sixth embodiment of the heat sink of the present invention.
(B) is an explanatory view of a comparative example embodying the sixth embodiment of the heat sink of the present invention.

FIG. 12 is a perspective view showing a conventional heat sink.

[Explanation of symbols]

 Reference Signs List A Heat sink 1 Good heat transfer body 11 Notch 12 Heating element mounting part (heat collecting part) 14 Heat radiating part (condensing part) 15 Fin 16 Cylindrical body 17 Fan provided at upper end 18 Fan provided at lower end 19 Provided at notched part Fan 21 heating element 22 control board

[Procedure amendment]

[Submission date] June 15, 2000 (2006.1.
5)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 10

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 11

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01L 23/467 H01L 23/46 C

Claims (7)

[Claims] 1. A radiating fin is provided from a portion near a heating element mounting portion (heat collecting portion) to a condensing portion (radiating portion) of a good heat transfer body comprising a flat thermosiphon or a flat heat pipe. A tubular body is provided so as to surround the heat transfer body, and in a flat type good heat transfer body type heat sink that takes in outside air into the tubular body and cools a condensing portion of the good heat transfer body, at least an intermediate portion of the tubular body A flat-type heat-transfer-type heat sink, wherein a notch is provided in one place. 2. A radiating fin is provided from a portion near a heating element mounting portion (heat collecting portion) to a condensing portion (radiating portion) of a good heat transfer body composed of a flat type thermosiphon or a flat type heat pipe. A cylindrical heat sink is provided so as to surround the heat transfer member, and the outside air is taken into the cylindrical member to cool the condensing portion of the heat transfer member. A flat-type heat-transfer-type heat sink, wherein the length is shorter than the entire length of the condensing part, and the length is shifted above the condensing part. 3. A radiating fin is provided from the vicinity of a heating element mounting portion (heat collecting portion) to a condensing portion (radiating portion) of a good heat transfer body comprising a flat thermosiphon or a flat heat pipe. A cylindrical heat sink is provided so as to surround the heat transfer member, and the outside air is taken into the cylindrical member to cool the condensing portion of the heat transfer member. A flat-type heat source, wherein the length is shorter than the entire length of the condensing portion, and the cut portion is shifted above the condensing portion, and a cutout portion is provided in at least one portion of an intermediate portion of the cylindrical body. Mobile heat sink. 4. The flat type good heat transfer according to claim 2, wherein the end of the heat radiation fin on the side of the heating element mounting section is located above the condensing section from the center of the heating element mounting section. Body heat sink. 5. The flat type good heat transfer type heat sink according to claim 1, wherein a fan is provided at at least one opening end of the cylindrical body. 6. The heat sink according to claim 1, wherein a fan is provided in a cutout portion at an intermediate portion of the cylindrical body. 7. The flat mold according to claim 1, wherein a fan is provided in at least one opening end of the cylindrical body and a cutout in an intermediate portion of the cylindrical body. Heat transfer type heat sink.