JPH0613168U - heatsink - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a small and lightweight heat sink having a high heat transfer rate or heat exchange rate. [Structure] The heat sink unit U1 is composed of a substrate 2, a perforated plate 3, and a corrugated fin 10 interposed in an annular shape between them. Then, the corrugated fin 10 is formed with a louver 14, which is substantially perpendicular to a line extending from the mountain portion 11 to the valley portion 12. The Peltier element 20 is mounted between the heat sink units U1 and U2 thus formed so as to be sandwiched from both sides, and the air for heat exchange by the axial fan provided in the perforated plate 3 is blown to the corrugated fins 13 and 13 at substantially right angles.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention comprises a substrate on which an object for heat exchange is mounted in contact, and a corrugated fin for radiating the heat of an object into the air or receiving heat from the air through the substrate, the corrugated fin having a valley portion for the substrate. The present invention relates to a heat sink which is arranged in an annular shape so as to be in contact with, and is configured so that air for heat exchange is blown to the corrugated fin at a substantially right angle, and then exits from the outside of the radius.

[0002]

[Prior art]

 Peltier elements are composed of different types of conductors or semiconductors, and despite their simple structure, they have excellent characteristics such as operating with a direct current of several volts and no moving parts. It is used as a heat sink for cooling heating elements such as lasers. It is also used to cool the atmosphere inside the box that houses the control unit and computer. On the other hand, electronic components used in electronic devices and power equipment, especially semiconductor devices, tend to be highly integrated and have large capacities, and as a result, the amount of heat generated by the devices also increases. Is also used.

A heat sink using a Peltier element has been proposed by the present applicant, for example, in Japanese Utility Model Publication No. 3-37245. This heat sink is roughly composed of a pair of substrates, a corrugated fin provided in an annular shape on the outer surface of these substrates, and an axial fan that blows air to these corrugated fins at a substantially right angle. . Therefore, when a Peltier element is sandwiched between a pair of substrates and a current is passed through the Peltier element, one absorbs heat and the other heats up. Therefore, for example, if the heat absorption side is located inside the box housing the control device, computer, etc., and the heat generation side is located outside the box body, and the air is blown to the corrugated fins by the respective axial fans, the cooling air is generated inside the box. It circulates and the internal computer etc. is cooled. At this time, by dissipating heat from the fins located outside the box, the control device, computer, etc. inside the box can be cooled at a high rate. Also, instead of the Peltier element, a heating element such as an electronic component is attached, and similarly, when the axial fan is activated and air is blown to the corrugated fin, the heat generated in the electronic component is conducted to the corrugated fin from the substrate. Then, the fins dissipate heat into the air.

[0004]

[Problems to be solved by the device]

 Also in the above heat sink, since the corrugated fins are provided on the substrate in an annular shape, when the axial fan is activated, the air hits the fins at a substantially right angle, and the air flows out evenly from the circumferential direction. The heat exchange rate can be obtained. Since the substrate has an axial fan, the heat sink can be made smaller and lighter. However, since the air blown from the axial fan simply flows from the corrugated fins to the valleys and out from the circumferential direction, the heat transfer coefficient may decrease. Therefore, if a corrugated fin with a louver is applied, the flow of air will be disturbed and the heat transfer coefficient can be increased. Since it is formed from the mountain to the mountain, the air flow becomes parallel to the louver, the louver is not utilized, and the characteristic that the corrugated fin is provided in the ring shape on the substrate may not be fully utilized. Therefore, an object of the present invention is to further improve the heat sink as described above and to provide a heat sink having a high heat exchange rate.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a substrate to which an object such as a Peltier element or a semiconductor element that exchanges heat is in contact, and a corrugated fin that radiates or receives the heat of the object into the air through the substrate. The corrugated fins are arranged in an annular shape so that the valleys are in contact with the substrate, and the air for heat exchange is blown to the corrugated fins at a substantially right angle, and then exits from the outside of the radius. The heat sink has a structure in which a louver is formed in the corrugated fin, the louver being substantially perpendicular to a line extending from the peak portion to the valley portion.

[0006]

[Action]

 Electronic components, for example, are attached to the side of the substrate where the corrugated fins are not provided. Then, for example, an axial fan blows air so that the air hits the corrugated fin at a substantially right angle. Then, the air hits the corrugated fin at a substantially right angle, then gradually changes its direction and goes out from the circumference of the corrugated fin to the outside of the radius. At this time, the air flow is disturbed by the louvers formed in the corrugated fins, and the heat of the electronic components is efficiently taken from the corrugated fins. By using a pair of substrates, electronic components can be sandwiched and effective cooling can be performed from both sides. When a Peltier element is attached instead of an electronic component and an electric current is applied, one absorbs heat and the other heats up. Therefore, for example, if the heat absorption side is located inside the box housing the control device, computer, etc., and the heat generation side is located outside the box body, and air is blown to the corrugated fins by, for example, an axial fan, the air will be approximately perpendicular to the corrugated fins. After hitting, the direction is gradually changed and goes out from the circumference of the corrugated fin to the outside of the radius. In this way, the cooling air circulates inside the box, and the computers inside are cooled. By using a pair of substrates, the Peltier element can be sandwiched between the substrates, for example, the heat absorption side is located inside the box housing the control device, computer, etc., and the heat generation side is located outside the box body. When air is blown to the corrugated fins, cooling air circulates inside the box, cooling the computers inside. At this time, by dissipating heat from the fins located outside the box, the control device, computer, etc. inside the box can be cooled at a high rate.

[0007]

【Example】

 Although the present invention can be implemented in various forms, an embodiment in which a Peltier element is sandwiched between circular substrates by using a pair of units and the inside of the box is cooled will be described below. As shown in FIG. 1, one unit U1 of the heat sink according to the present embodiment includes a substrate 2 having a circular planar shape, a perforated plate 3 also having a circular shape, a substrate 2 and a perforated plate 3, as shown in FIG. And a corrugated fin 10 provided between the two.

The corrugated fin 10 is formed of an alloy such as aluminum, like the substrate 2 and the perforated plate 3. Then, as shown in FIG. 2, a cross section including a mountain portion 11, a valley portion 12, and a slope portion 13 connecting the mountain portion 11, and the valley portion 12, The shape is formed to have a substantially wavy shape. A cut is made in the inclined surface portion 13, and a plurality of louvers 14 facing upward are formed on both surfaces of the cut portion by vertically raising the cut portions. The louvers 14 are parallel to the peaks 11 or the valleys 12. The corrugated fin 10 thus formed is bent so as to have a donut shape or an annular shape when seen in a plan view. Then, as shown in FIG. 1, between the substrate 2 and the perforated plate 3, and as shown in FIGS. The valleys 12 are in contact with the substrate 2 and the peaks 11 are in contact with the perforated plate 3 on the outer side, that is, on the outer peripheral portion of the substrate, and are integrated by, for example, brazing. An axial fan 15 is provided on the upper side of the perforated plate 3 by utilizing, for example, the circumferential portion of the perforated plate 3. The other unit U2 of the heat sink S is also configured in the same manner as the unit U1 described above, and therefore, the same members will be denoted by the same reference numerals with a dash "'" and will not be redundantly described.

Next, the operation of the above embodiment will be described. The Peltier element 20 is sandwiched between the units U1 and U2. Since the diameter of the Peltier element 20 is sufficiently smaller than the diameter of the substrates 2, 2 ', although not shown in the figure on the outer peripheral portion of the Peltier element 20, a partition material is sandwiched in the same manner. By utilizing this partition material, the heat absorption side of the Peltier element 20, for example, the unit U 1 is positioned inside the box housing the control device, computer, etc., and the heat generation side of the unit U 2 is positioned outside the box. When the Peltier element 20 is energized and the axial fans 15 and 15 'are activated to blow air to the corrugated fins 10 and 10', the air hits the corrugated fins 10 and 10 'at a substantially right angle, and turns to change the direction. It goes out evenly from the outer periphery of 10 '. Air circulates in the box to form a cooling wind, and the internal control device, computer, etc. are cooled. At this time, heat is radiated to the outside from the corrugated fin 10 'located on the outer side of the box, so that the control device, computer, etc. inside the box can be cooled at a high rate. At this time, when the air blown from the axial flow fans 15 and 15 'hits the corrugated fins 10 and 10' at a substantially right angle, the flow is disturbed by the louvers 14 and 14, so that the heat transfer coefficient is increased. According to the present embodiment, since the corrugated fins 10 and 10 'are bent in an annular shape, the distance between the fins is close to the portion K which is behind the motors 16 and 16' of the axial fan 15 and 15 '. It is narrow and widens as it approaches the outer circumference. Therefore, the air blown from the axial flow fans 15 and 15 'smoothly flows from the center to the outer side of the radius.

When electronic components are attached instead of the Peltier element 20 and the axial fans 15, 15 ′ are driven, it is clear that the heat generated by the electronic components is radiated outside from the corrugated fins 10, 10 ′. Is. The air blown by the axial fans 15, 15 'first strikes the corrugated fins 10, 10' at a right angle, and then changes the flow direction and goes out from the outer periphery of the corrugated fins 10, 10 'to the radius outward. Therefore, the louvers 14 and 14 formed on the slope 13 of the corrugated fins 10 and 10 'are also formed parallel to the mountain portion 11 in the portion close to the mountain portion 11 and correspond to the air flow direction as they approach the valley portion 12. You can also give it an angle. Such an embodiment is shown in FIG. Further, it is clear that the portion K of the axial fan 15 which is to be under the influence of the motor 16 can be implemented either in a hollow state or surrounding the periphery, and further, the units U1 and U2 can be implemented by one unit. . Also, the axial fan 15 can be provided in only one unit.

[0011]

[Effect of device]

 As described above, according to the present invention, the corrugated fins are arranged in an annular shape so that the valleys are in contact with the substrate, the air for heat exchange is blown to the corrugated fins at a substantially right angle, and the corrugated fins are emitted from the outside of the radius. The air flows evenly around the entire circumference, and a high heat exchange rate is obtained. At the same time, a louver is formed on the corrugated fin at a substantially right angle to the line from the peak to the valley, so the temperature boundary layer along the surface of the corrugated fin is destroyed and the heat transfer coefficient is increased. Is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view of a corrugated fin according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view corresponding to the view seen from AA in FIG.

4 is a sectional view taken along line BB in FIG.

FIG. 5 is a sectional view showing a part of another embodiment of the corrugated fin.

[Explanation of symbols]

2 substrate 3 perforated plate 10 corrugated fin 11 valley 13 mountain 14 louver 15 axial fan 20 Peltier element

Claims (1)

[Scope of utility model registration request] 1. A corrugated fin comprising: a substrate to which an object such as a Peltier element or a semiconductor element for heat exchange is attached in contact; and a corrugated fin for radiating or receiving the heat of the object into the air through the substrate. Is a heat sink in which a valley portion is arranged in an annular shape so as to be in contact with the substrate, air for heat exchange is blown to the corrugated fins at a substantially right angle, and then goes out from the outside of the radius. The heat sink characterized in that the corrugated fin is formed with a louver which is substantially perpendicular to a line extending from the mountain portion to the valley portion.