JP2000196272A - Cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To let cooling wind flow efficiently to the vicinity of the center, that is, the boss part of the blower of a heat radiation plate. SOLUTION: A blower 3 is made the so-called suction type where cooling wind is sucked into the blower after flowing on a heat radiation plate 1. Moreover, enough space is made on the side of the heat radiation plate 1 of the boss part of the blower 1. As a result, relative negative pressure is made at the center of the blower so that the cooling wind may flow to the center (boss part) by this negative pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device suitable for cooling a heat generating member such as a microprocessor unit.

[0002]

2. Description of the Related Art Conventionally, as a cooling device for cooling a heat-generating member such as an electronic component, there is known a cooling device as disclosed in Japanese Patent Application Laid-Open No. 8-83873. This has a so-called push-in type blower that uses a blower motor to rotate the blower and blows the cooling air generated by the rotation onto the heat radiation plate.

FIG. 1 schematically shows this conventional example. In this type of blower, the flow velocity decreases as approaching the base of the blower, and almost no wind flows at the central boss 3a of the blower. . In addition, since the motor 7 is disposed on the lower surface of the boss 3a, the presence of the motor 7 prevents cooling air from flowing to the center of the blower.

For this reason, as shown in FIG. 2, when this blower is combined with a heat radiating plate 1,
In the center part 1a of FIG. 1, there is an area a where the cooling air hardly hits.

The heat radiating plate 1 is in contact with a heat-generating member such as the electronic component 10, and the heat-generating member 10 is usually located at the center of the heat radiating plate 1 when assembled. Therefore, the central portion 1a of the heat radiation plate 1, which needs the most cooling, faces the region a where no cooling air is generated as described above, and the cooling efficiency is poor as a whole.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a blower arrangement in which sufficient cooling air flows also in the central portion 1a of the heat radiating plate 1.

[0007]

According to the present invention, a suction type blower is used instead of a conventional push-in type blower.

[0008]

With this configuration, the pressure around the boss portion at the center of the blower is reduced, and as a result, the cooling air can flow around the portion facing the boss. This allows the cooling air to flow to the central portion of the heat radiating plate, that is, the portion facing the boss of the blower, thereby increasing the cooling efficiency of the heat radiating plate.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows a layout in which the blower 3 is of a suction type, and the blower 3 has a cylindrical boss 3a.
A plurality of fans 3b are arranged at equal intervals around the periphery of the fan 3b. The blower 3 has a diameter of 3 to 8c.
It is a small fan of about m. Boss 3 in the center
The motor 5 having a cylindrical shape is provided on the back side of FIG.
Is attached. This motor uses a DC brushless motor having an output of about 1 to 3 watts. The blower 3 is covered by a blower case 4, and a cylindrical portion 4a of the blower case 4 faces the fan 3b, and the cylindrical portion 4a functions as a shroud for guiding cooling air. Further, as a result of the blower 3 being disposed inside the cylindrical portion, a sufficient space 7 is provided on the lower surface of the boss 3a of the blower.
Is formed.

FIG. 4 shows a state where the blower 3 and the blower case and the heat radiating plate 1 are assembled.

The heat radiating plate 1 is made of an aluminum plate having a thickness of about 1 to 5 mm. The blower generates cooling air by the rotation of the fan 3b, and the circumferential speed of the rotation of the fan increases toward the outside in the radial direction. As a result, the cooling air generated by the blower 3 moves to the outer peripheral side as shown in FIG. The higher the wind speed, the faster the wind speed. As a result, the space 7 below the boss 3a of the blower 3 has a relatively negative pressure, so that cooling air flows toward the space 7 below the boss 3a as shown in FIG. The space 7 below the boss 3a has a height of about 2 to 10 mm in this example. That is, as shown in FIG. 4, the cooling air is not sucked only in the outer circumferential direction of the blower, but the boss 3a
Flow to the central portion 1a of the heat dissipation plate facing the heat sink. Therefore, the cooling air flows widely over the upper surface of the heat dissipation plate, and efficient heat dissipation can be performed.

FIG. 5 shows an embodiment in which corrugated fins 2 are attached to a heat radiating plate 1. The corrugated fin 2 is made of an aluminum strip having a thickness of about 0.1 mm, and is brazed to a heat dissipation plate 1 also made of an aluminum alloy. The corrugated fin 2 is formed by cutting and raising a large number of louvers 2a so that cooling air can pass through the inside.

The above-described blower case 4 is thus provided on the upper surface of the corrugated fin 2, that is, the corrugated fin 2
Is attached to a portion on the opposite side of the heat dissipation plate 1 with respect to. Thus, even if the corrugated fins are arranged between the blower case 4 and the heat radiating plate 1, as shown in FIG.
Cooling air can flow into the central portion 1a of the heat radiating plate 1. This is because a large number of louvers 2a are cut and raised in the corrugated fins 2 so that cooling air flows between the louvers satisfactorily and is sucked into the blower 3 side.

In FIG. 5, reference numeral 1d denotes a locking portion bent from the side of the cooling plate to improve the brazing property by positioning the corrugated fin 2 and to cover the outside of the corrugated fin 2.

In this embodiment, the blower case 4 is made of a resin such as saturated polyester or ABS, and the blower case 4 is fixed to the heat radiation plate 1 with screws (not shown) or the like.

[0017]

According to the present invention, the blower is of a suction type in which the wind generated by the blower is sucked into the blower after passing over the radiator plate, and a sufficient space is provided on the radiator plate 1 side of the blower. Since the cooling air is provided, the cooling air for cooling the heat radiation plate can flow to the center of the blower, that is, the position where the boss is arranged. Therefore, it is possible to cool the heat radiation plate widely and efficiently.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a wind speed distribution of a conventional push-in type blower.

FIG. 2 is a sectional view showing a state of cooling air when a conventional push-type blower is used.

FIG. 3 is a sectional view showing a wind speed distribution of the suction type blower of the present invention.

FIG. 4 is a sectional view showing an example in which the blower shown in FIG. 3 is assembled to a heat dissipation plate.

FIG. 5 is an instruction diagram showing a state in which corrugated fins are attached to a heat dissipation plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat dissipation plate 2 Corrugated fin 3 Blower 3a Boss 4 Blower case 4a Shroud 5 Motor

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kazuaki Kafuku 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Corporation (72) Inventor Takaki Okochi 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Denso Corporation F term (reference) 5E322 AA01 AA11 AB11 BA03 BA05 BB03

Claims (6)

[Claims] A heat-dissipating plate which contacts the heat-generating member and receives heat from the heat-generating member; a blower for flowing cooling air on the heat-dissipating plate; a motor arranged at a central portion of the blower for rotating the blower; A blower case that is arranged to cover the blower and guides the wind generated by the blower to the flow along the heat radiating plate, wherein the blower blows the cooling air in the direction along the heat radiating plate, and then sucks into the blower A cooling device, which is arranged so as to be cooled. 2. A heat radiation plate, wherein a corrugated fin is disposed in a thermally coupled state, and the blower is disposed on the opposite side of the heat radiation plate with respect to the corrugated fin. The cooling device according to claim 1, wherein 3. The cooling device according to claim 2, wherein the corrugated fin is formed by cutting and raising a louver through which cooling air can pass. 4. The cooling device according to claim 1, wherein the motor is a DC brushless motor. 5. The cooling device according to claim 1, wherein the motor is disposed at a position opposite to the heat radiating plate with respect to the blower. 6. The cooling device according to claim 2, wherein a space of about 2 to 5 mm is formed between said blower and said corrugated fin.