JP2000097191A - Fan integral with cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fan integral with cooling device used for cooling heating parts such as an MPU in a personal computer and the other electronic device and exhibiting extremely effective cooling action. SOLUTION: In this fan integral with cooling device in which a cooling wind supply opening 7 is formed in a circumferential wall 6 surrounding an impeller 3 in a fan casing 1 and a guide groove 9 leading to the cooling wind supply opening 7 is formed in the inner surface of the circumferential wall 6, cooling wind by the impeller 3 is guided to the supply opening 7 through the cooling wind guide groove 9 formed in the inner surface of the circumferential wall 6 while reducing ventilation resistance, a cooling wind ventilation quantity is increased, a surface area is increased and cooling effect is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan-integrated cooling device for cooling a heat-generating component such as an MPU in a personal computer, other electronic equipment, or the like.

[0002]

2. Description of the Related Art Generally, an MPU (A) is used as a functional component in a small electronic device such as a multifunctional, high-performance personal computer as shown in FIG.
(A) is a local high heat source, so MPU
A cooling device (B) is attached to (A) to dissipate heat generated by the MPU (A) to ensure the safety of the device.

Although a small cooling device (A) is required, a normal heat sink having a radiation fin cannot sufficiently cool the cooling device.
As shown in FIG. 1, a motor unit 2 and an impeller 3 which is driven to rotate by the motor unit 2 are provided in a flat fan casing 1 also serving as a heat sink, and a bottom plate 4 of the fan casing 1 is provided on an upper surface of a heat generating component 5 such as an MPU. A fan-integrated cooling device configured to be joined to a fan is used. Then, the heat of the heat-generating component 5 is guided to the fan casing 1, and the fan casing 1 is forcibly cooled by a heat sink function of the fan casing 1 and a cooling air generated by the rotation of the impeller 3, so that the heat
I'm trying to cool.

[0004]

However, the above-mentioned conventional fan-integrated cooling device has a heating element 5 such as an MPU.
Fan casing 1 that doubles as heat sink
And the heat dissipation of the fan casing 1 and the cooling by forced cooling of the fan casing 1 by the fan, for example, when the heat-generating temperature of the heat-generating component is increased by the operating frequency. Does not provide sufficient cooling, and the heat-generating component and its peripheral components may be thermally degraded or destroyed.

Further, the cooling air generated by the rotation of the impeller 3 hits the inner surface of the peripheral wall 6 surrounding the impeller 3 in the fan casing 1, and the force of the cooling air impinges, as shown in the vector diagram of FIG. Centrifugal force a in the horizontal direction with respect to the impeller surface and suction force b in the vertical direction with respect to the impeller surface
And a strong pressing force d of a three-dimensional vector that is a combination of the rotational force c in the horizontal direction. Therefore, in the conventional configuration in which the cooling air is guided to the outlet 7 only by the peripheral wall 6,
The pressing force d generates a large pulsating flow in the vicinity of the peripheral wall 6 and causes a large ventilation resistance to reduce the ventilation amount, so that it may be difficult to obtain a sufficient ventilation amount for cooling, and a more effective cooling effect is provided. A cooling device has been desired.

The present invention has been made in view of the above problems, and has as its object to provide a fan-integrated cooling device exhibiting an extremely effective cooling action.

[0007]

To achieve the above object, the present invention provides a fan casing which also serves as a heat sink, comprising a motor section and an impeller which is driven to rotate by the motor section. A cooling device that forms a port, forms a cooling air outlet on a part of a peripheral wall surrounding the impeller, and is arranged and joined to an upper surface of a heat-generating component such as an MPU, wherein an inner surface of the peripheral wall surrounding the impeller includes: A cooling device integrated with a fan having a configuration in which a cooling air guide groove reaching a cooling air outlet is formed.

According to the present invention, not only the heat of the heat-generating component is guided to the fan casing to dissipate heat and cool the fan, but also the cooling air from the impeller blows out through the guide groove formed on the inner surface of the peripheral wall surrounding the impeller. The cooling action of the fan-integrated cooling device is further increased by increasing the amount of ventilation and increasing the surface area by the guide groove.

[0009]

DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present invention, a motor casing and an impeller rotatably driven by the motor are provided in a fan casing also serving as a heat sink, and an air suction port is provided at an upper portion of the fan casing. The cooling air outlet is formed in a part of the peripheral wall surrounding the impeller, and one or more stages of cooling air guide grooves reaching the cooling air outlet are formed on the inner surface of the peripheral wall. This cooling device is a fan-integrated cooling device, and has the effect of increasing the amount of cooling air flowing along with the heat radiation and cooling by the fan casing, increasing the surface area of the fan casing in contact with the cooling air, and further increasing the cooling effect.

[0010] According to a second aspect of the present invention, in the fan-integrated cooling device according to the first aspect, the cooling air guide groove is formed substantially parallel to the inner bottom surface of the fan casing. This has the effect that the ventilation resistance of the cooling air is reduced and the cooling effect is further increased.

According to a third aspect of the present invention, in the cooling device integrated with the fan according to the first aspect, the cooling air guide groove has a configuration in which a starting end thereof is located away from the cooling air outlet. The cooling air to be blown out does not return to the cooling air guide groove, and the cooling air is effectively guided and the cooling effect is further increased.

[0012] According to a fourth aspect of the present invention, in the cooling device integrated with a fan according to the first or second or third aspect, the cooling air guide groove is formed such that the depth gradually increases from the start end to the end. This configuration has the effect that the ventilation resistance of the cooling air gradually decreases and is guided effectively, and the cooling effect is further increased.

An embodiment of a fan-integrated cooling device according to the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of a fan-integrated cooling device according to Embodiment 1 of the present invention, and FIG. 2 is a top view of the fan-integrated cooling device. In the drawings, the same components as those of the conventional example shown in FIGS. 4 and 5 are denoted by the same reference numerals as those of the conventional example.

As shown in FIGS. 1 and 2, the fan casing 1 is made of aluminum die-casting having good heat conductivity.
The whole is formed in a rectangular shape and flat, and also serves as a heat sink. A motor unit 2 and an impeller 3 that is driven to rotate by the motor unit 2 are provided in the fan casing 1. An air suction port 8 is formed in an upper portion of the fan casing 1. The cooling air outlet 7 is formed in a part of the peripheral wall 6 surrounding the. Then, the bottom plate 4 of the fan casing 1 is joined to the upper surface of the heat-generating component 5 such as an MPU so as to have a thermal connection.

The first embodiment is characterized in that a cooling air guide groove 9 reaching a cooling air outlet 7 is formed on the inner surface of a peripheral wall 6 surrounding the impeller 3 in the fan casing 1. In the first embodiment, the cooling air guide groove 9 has one stage, but it may have a plurality of stages. The cooling air guide groove 9 is formed in a U-shaped cross section so that ventilation is smooth.

The cooling air guide groove 9 is formed so as to be parallel to the inner bottom of the fan casing 1, and its starting end 9 a is located away from the cooling air outlet 7.
The end 9b is made to communicate with the cooling air outlet 7 by rotating. Further, the cooling air guide groove 9 is arranged such that the end 9a extends from the starting end 9a.
b, the depth is gradually increased.

In the fan-integrated cooling device having the above-described structure, the heat generated by the heat-generating component 5 is transmitted to the fan casing 1 and is radiated by the heat sink function of the fan casing 1 and cooled by the cooling air generated by the rotation of the impeller 2.

Here, the cooling air generated by the rotation of the impeller 3 is applied to the peripheral wall 6 surrounding the impeller 3 by centrifugal force.
The inner wall of the peripheral wall 6 tends to generate ventilation resistance, but the cooling air guide groove 9 formed on the inner surface of the peripheral wall 6 guides the ventilation outlet 7 with reduced ventilation resistance.
The cooling action is further increased due to an increase in the amount of the cooling air flow and an increase in the surface area of the cooling air guide groove 9.

Further, since the cooling air guide groove 9 is formed in parallel with the inner bottom surface of the fan casing 1, the ventilation resistance of the cooling air is reduced, the amount of air flow is increased, and the cooling action is further enhanced. It will be big.

Further, the cooling air guide groove 9 has a starting end 9a.
Is located away from the cooling air outlet 7,
The cooling air blown out from the outlet 7 is cooled by the cooling air guide grooves 9.
The cooling air is effectively guided without returning to the starting end 9a of the cooling air.

Further, the cooling air is supplied to the end 9 of the cooling air guide groove 9.
However, in the first embodiment, the depth of the cooling air guide groove 9 is gradually increased from the start end 9a to the end 9b, so that the pressure of the cooling air is gradually increased. That is, the ventilation resistance is gradually reduced, the cooling air is effectively guided while increasing the amount of cooling air, and the cooling effect is further increased.

In the above-described embodiment, the fan casing 1 is made of aluminum die-cast, but may be made of other metal materials. Alternatively, it may be configured to be connected by another heat conductive member.

[0024]

As is apparent from the above description, according to the present invention, not only the heat of the heat-generating component is guided to the fan casing to radiate and cool the fan, but also the cooling air from the impeller surrounds the impeller. The guide groove formed on the inner surface of the peripheral wall guides the air outlet to the outlet with reduced ventilation resistance,
An increase in the amount of ventilation and an increase in the surface area by the guide groove realize a fan-integrated cooling device having a greater cooling effect, and the effect is great. Furthermore, since the outer shape is the same and the weight is reduced, the weight of the embedded product can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a fan-integrated cooling device according to a first embodiment of the present invention.

FIG. 2 is a top view of the fan-integrated cooling device.

FIG. 3 is a perspective view of a conventional fan-integrated cooling device in use.

FIG. 4 is a cross-sectional view of a conventional fan-integrated cooling device.

FIG. 5 is a top view of the cooling device integrated with a fan.

FIG. 6 is a vector diagram of a cooling wind applied to an inner surface of a peripheral wall in the cooling device integrated with a fan.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fan casing 2 Motor part 3 Impeller 4 Bottom plate 5 Heating component 6 Peripheral wall 7 Blow-out port 8 Air suction port 9 Cooling air guide groove 9a Start end 9b End

Claims (4)

[Claims] 1. A fan casing, which also serves as a heat sink, includes a motor portion and an impeller rotatably driven by the motor portion, an air suction port is formed in an upper portion of the fan casing, and a part of a peripheral wall surrounding the impeller is cooled. A fan-integrated cooling device having a configuration in which an air outlet is formed, wherein one or more cooling air guide grooves reaching the cooling air outlet are formed on the inner surface of the peripheral wall. 2. The fan-integrated cooling device according to claim 1, wherein the cooling air guide groove is formed substantially parallel to an inner bottom surface of the fan casing. 3. A cooling device integrated with a fan according to claim 1, wherein the starting end of the cooling air guide groove is located away from the cooling air outlet. 4. The cooling air guide groove is formed so as to gradually increase in depth from a start end to an end.
4. The cooling device integrated with a fan according to any one of items 2 and 3.