JP2000104697A - Integrated fan cooling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an integrated fan cooling system capable of obtaining sufficient ventilation for cooling and having high fan efficiency. SOLUTION: A gap between the outer boundary of an impeller 5 and the inner boundary surface of a fan-housing recessed part 1 is gradually increased toward the downstream part of air blasting. A gap between the inner boundary of the air inlet port of a casing cover and the outer boundary of an impeller boss part is gradually decreased toward the downstream side of the air blasting. A reflux preventing rib 9 is formed between the blowout port 2 of a fan casing 3 and the upperstream part of the air blasting. Thus, sufficient ventilation is obtained to enhance fan efficiency.

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 In general, small electronic devices such as multi-function, high-performance personal computers are generally used as shown in FIG.
The MPU (A) is used as a functional component, but since the MPU (A) is a local high heat source, the MPU (A)
A cooling device (B) is attached to U (A) to dissipate the heat generated by MPU (A) to ensure the safety of the equipment.

Although the cooling device is required to be small, a normal heat sink having a radiation fin cannot sufficiently cool the cooling device. Therefore, as shown in FIGS. A fan casing 3 having an outlet 2 to which a part of the fan housing recess 1 communicates on one side; an impeller 5 housed together with the motor unit 4 in the fan housing recess 1; And a casing cover 7 having a circular air suction port 6.

More specifically, as shown in FIG. 6, the impeller 5 has a fan housing recess 1 inside the fan housing recess 1.
Accordingly, the gap a between the outer periphery of the impeller 5 and the inner peripheral surface of the fan housing recess 1 is substantially uniform from the upstream portion to the downstream portion.

As shown in FIG. 7, a circular air suction port 6 of the casing cover 7 is also arranged concentrically with the impeller 5, and therefore, a gap b between the inner periphery of the air suction port 6 and the impeller boss 5a. However, that is, the air suction gap is uniform from the upstream portion to the downstream portion. Further, as shown in FIG. 8, the fan housing recess 1 of the fan casing 3 has an inner surface in which a space between the upstream side of the fan and the outlet 2 is continuous.

In the above configuration, by rotating the impeller 5 by the motor unit 4, the air sucked from the air suction port 6 is sent to the inner peripheral surface of the fan housing recess 1 by centrifugal force and from the upstream of the air blowing. The air is blown while being gradually compressed toward the downstream side of the air, and is blown out from the blowout port 2. The blowing is used as cooling air to forcibly cool the fan casing 3 or the heat-generating component to which the heat of the heat-generating component such as the MPU is transmitted.

[0007]

However, in the conventional fan-integrated cooling device, the gap a between the outer periphery of the impeller 5 and the inner peripheral surface of the fan housing recess 1 is evenly distributed from the upstream portion to the downstream portion. And the gap b between the inner periphery of the air suction port 6 and the impeller boss 5a is uniform from the upstream portion to the downstream portion of the blower, so that the cooling air is considerably compressed in the downstream portion of the blower. Despite the flow in a state of being blown, there is a problem in that it is difficult to obtain high fan efficiency because the ventilation resistance in the downstream portion of the ventilation increases.

In FIG. 6, even if the impeller 5 is mounted eccentrically from the center of the fan accommodating recess 1, the gap a is designed to increase gradually from the upstream portion to the downstream portion. However, a large part of the outer periphery of the fan housing recess 1 is provided with an air reservoir, which prevents the pressure from continuously increasing from the upstream portion to the downstream portion.

Also, since the ventilation resistance between the upstream portion of the fan housing concave portion 1 of the fan casing 3 and the outlet 2 is not so large, the cooling air is recirculated from the outlet 2 to the upstream portion of the fan, and the fan efficiency is reduced. Is a bad factor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fan-integrated cooling device that can provide a sufficient airflow and has high fan efficiency, while keeping in mind the above conventional problems.

[0011]

In order to achieve the above-mentioned object, the present invention is directed to a casing, in which a gap between an outer periphery of an impeller and an inner peripheral surface of a fan accommodating recess is gradually increased toward a downstream portion of the air blower. A recirculation preventing rib was formed between the outlet of the fan casing and the upstream of the air blow so that the gap between the inner circumference of the air inlet of the cover and the outer circumference of the impeller boss 5a gradually decreased toward the downstream side of the air blow. The configuration is a fan-integrated cooling device.

According to the present invention, a fan-integrated cooling device with high fan efficiency can be realized.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a fan casing having a circular fan housing recess and a blowout opening on one side of which a part of the fan housing recess communicates; An impeller housed together with the motor unit, and a casing cover superposed on the upper surface of the fan casing and having an air suction port. The gap between the outer periphery of the impeller and the inner peripheral surface of the fan accommodating recess is formed in a downstream portion of the blower. Eccentrically arranged in the fan accommodating recess so as to gradually increase toward the air outlet, and formed so that the gap between the inner periphery of the air suction port of the casing cover and the outer periphery of the impeller boss gradually decreases toward the downstream side of the blower. A fan-integrated cooling device in which a recirculation-preventing rib is formed between the outlet of the fan casing and the upstream portion of the blower, Small ventilation resistance against the cooling air in the wind downstream portion, sufficient large ventilation amount can be obtained in the cooling also without reflux in blowing the upstream of inlet cooling air balloon, has the effect of fan efficiency is improved.

According to a second aspect of the present invention, in the cooling device integrated with a fan according to the first aspect, the return prevention rib is formed inside the casing cover, and the cooling air is blown out. It does not return to the upstream of the blast,
In addition to improving the fan efficiency, it has an effect of facilitating the formation of the recirculation prevention rib.

According to a third aspect of the present invention, in the fan-integrated cooling device according to the first aspect, the fan casing is formed of a metal material having good heat conductivity and also serves as a heat sink. Since the fan casing that has transmitted the heat generated by the heat-generating components radiates heat by the heat sink function and is forcibly cooled by the cooling air, the cooling effect is enhanced.

Hereinafter, an embodiment of a fan-integrated cooling device of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a top view of a fan-integrated cooling device according to Embodiment 1 of the present invention with a casing cover removed, and FIG. 2 is a top view of the fan-integrated cooling device. FIG. 3 is a top view of a fan casing of the fan-integrated cooling device, and FIG. 4 is a sectional view of the fan-integrated cooling device. In each figure, the same components as those of the conventional technology shown in FIGS. 6 to 9 are denoted by the same reference numerals as those of the conventional technology.

As shown in FIGS. 1 to 4, the fan casing 3 is made of an aluminum die-cast having good heat conductivity, is formed in a square shape and flattened as a whole, has a circular fan housing recess 1, and , Also serves as a heat sink. A motor unit 4 and an impeller 4 that is driven to rotate by the motor unit 4 are provided in the fan housing recess 1 of the fan casing 3, and a casing cover having a circular air suction port 6 formed in an upper part of the fan casing 3. 7 are provided. Further, a cooling air outlet 2 is formed in a part of the peripheral wall surrounding the impeller 3 in the fan housing concave portion 1 of the fan casing 3. Then, the bottom plate of the fan casing 3 is joined to the upper surface of the heat-generating component 8 such as an MPU to provide thermal coupling.

The feature of the first embodiment is that, as shown in FIG. 1, the gap between the outer periphery of the impeller 5 and the inner peripheral surface of the fan accommodating recess 1 is a downstream air gap a1, and a middle air section near the downstream air blow section. The relationship of a1>a2>a3> a4, ie, the gap gradually increases toward the downstream side of the blower, as the gap a2, the middle blower gap a3 near the upstream of the blower, and the gap a4 near the outlet of the blower and the uppermost stream of the blower. As shown in FIG. 2, the impeller 5 is eccentrically arranged in the fan housing recess 1, and the inner periphery of the air suction port 6 of the casing cover 7 and the impeller boss 5 a
The gap b between the outer peripheries of the sections is the downstream gap b1
FIG. 3 shows a configuration in which the air intake port 6 is arranged as the air blowing intermediate gap b2 and the air blowing upstream gap b3 such that the relationship of b1 <b2 <b3, that is, the gap gradually decreases toward the air blowing downstream. As shown in the figure, the recirculation prevention rib 9 is formed in the inner bottom portion of the fan casing 3 and between the blowout port 2 and the upstream portion of the blower in the horizontal direction 9a and the vertical direction 9b of the fan housing recess. Although not shown, the reflux preventing ribs may be provided inside the casing cover 7 and also at a portion corresponding to a portion between the blowout port 2 and the upstream portion of the blower. In addition, the reflux prevention rib 9
By connecting the horizontal direction 9a and the vertical direction 9b of the fan accommodating concave portion to form a rib also at the corner of the outer peripheral bottom surface of the fan accommodating concave portion, the recirculation preventing function can be enhanced.

In the fan-integrated cooling device having the above-described structure, the heat generated by the heat-generating component 8 is transmitted to the fan casing 3 and is radiated by the heat sink function of the fan casing 3 and cooled by the cooling air generated by the rotation of the impeller 5.

Here, the cooling air generated by the rotation of the impeller 5 strongly hits the peripheral wall of the fan housing concave portion 1 surrounding the impeller 5 due to the centrifugal force, and further tends to be compressed on the downstream side of the blower. Gap a1> a
2>a3> a4 and the gap b1 <b2 <b3, that is, the gap a gradually increases toward the downstream side of the blower, and the gap b gradually decreases toward the downstream side of the blower. Therefore, the ventilation resistance in the downstream portion of the ventilation is small, and a large amount of cooling air can be obtained. In addition, since the recirculation prevention rib 9 is formed between the outlet 2 and the upstream portion of the air flow, the recirculation of the cooling air is small.

Therefore, since the amount of the cooling air flow increases and there is no recirculation of the cooling air, the fan efficiency is high, and the cooling effect is high.

In the first embodiment, the air suction port 6 of the casing cover 7 is circular. However, the air suction port 6 may have a so-called D-cut shape in which a portion corresponding to the upstream portion of the air blow is cut. Further, although the fusing is formed by aluminum die casting, it may be formed by other materials.

The ribs at the outlet may be omitted.
The addition of the ribs increases the surface area that the cooling air hits, which increases the cooling effect.However, it also becomes a factor that impedes ventilation, so it is necessary to evaluate the cooling effect comprehensively to determine whether to add ribs. I just need.

[0025]

As is apparent from the above description, according to the present invention, the gap between the outer periphery of the impeller and the inner peripheral surface of the fan accommodating recess is gradually increased toward the downstream side of the blower, and the casing is formed. Since the gap between the inner periphery of the air suction port of the cover and the outer periphery of the impeller boss is gradually reduced toward the downstream side of the blower, and a recirculation preventing rib is formed between the outlet of the fan casing and the upstream side of the blower. In addition, a sufficient amount of ventilation for cooling is obtained, and a fan-integrated cooling device with high fan efficiency is realized.
The effect is great.

[Brief description of the drawings]

FIG. 1 is a top view of a fan-integrated cooling device according to a first embodiment of the present invention, with a casing cover removed.

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

FIG. 3 is a top view of the fan casing of the fan-integrated cooling device.

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

FIG. 5 is a perspective view of a conventional fan-integrated cooling device in use.

FIG. 6 is a top view of the conventional fan-integrated cooling device without a casing cover.

FIG. 7 is a top view of the fan-integrated cooling device.

FIG. 8 is a top view of a fan casing of the fan-integrated cooling device.

FIG. 9 is a sectional view of the fan-integrated cooling device.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 fan storage recess 2 outlet 3 fan casing 4 motor unit 5 impeller 5a impeller boss 6 air intake port 7 casing cover 8 heat generating component 9 return prevention rib

Claims (3)

[Claims] 1. A fan casing having a circular fan housing recess and an outlet on one side of which a part of the fan housing recess communicates; an impeller housed in the fan housing recess together with a motor; A casing cover having an air suction port stacked on the upper surface, the impeller is eccentric to the fan housing recess so that the gap between the outer periphery thereof and the inner circumferential surface of the fan housing recess gradually increases toward the downstream side of the blower. And the gap between the inner circumference of the air suction port of the casing cover and the outer circumference of the impeller boss portion is formed so as to gradually decrease toward the downstream side of the air flow, and the gap between the air outlet of the fan casing and the upstream side of the air flow is formed. A cooling device integrated with a fan, wherein a preventing rib is formed. 2. The fan-integrated cooling device according to claim 1, wherein the reflux preventing rib is formed inside the casing cover. 3. The fan-integrated cooling device according to claim 1, wherein the fan casing is formed of a metal material having good heat conductivity, and also serves as a heat sink.