JP2001153090A - Cooling fan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the cooling performance of a cooling fan motor. SOLUTION: A casing 1 is formed of a material excellent in thermal conductivity, and a centrifugal flow fan 2 and a motor 3 are assembled in a recessed part 4 formed in the casing 1. A groove part 11 along the outer peripheral surface of the recessed part 4 is formed on the upper surface of the casing 1, and a cooling body 10 is fitted to the groove part 11. On the other hand a heating body 14 is thermally connected fixedly to the lower surface of the casing 1. Thus a heat generated in the heating body 14 is conducted efficiently to the casing 1, and the cooling performance of the easing 1 is increased by the centrifugal flow fan 2 and cooling body 10 assembled in the easing 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cooling fan motor for cooling a heating element.

[0002]

2. Description of the Related Art In electronic components incorporated in various electric devices, it is essential to cool a heating element that generates heat. Conventionally, as a cooling fan motor for such a heating element, an axial fan that attaches a propeller-type fan to the motor and cools the heating element by blowing air has been known. However, in this type of axial fan, as shown in FIG. 4, there is a possibility that a slack region occurs in the air volume / static pressure characteristics and the cooling performance is reduced.

[0003] In order to improve the cooling performance of the heating element,
Although it is conceivable to incorporate a cooling body into a cooling fan motor, it is structurally difficult to thermally connect the cooling body to the axial fan in the structure of an axial fan with a propeller type mounted on the motor. Cooling performance cannot be expected.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a cooling fan motor having excellent cooling performance.

[0005]

In the cooling fan motor according to the first aspect of the present invention, heat generated by the heat generating element is transmitted to a casing having excellent heat conductivity to exchange heat. Further, since the centrifugal flow fan does not have a slack region in the air volume / static pressure characteristics, the cooling performance does not drop.

Further, in the cooling fan motor according to the second aspect of the present invention, the casing of the cooling fan motor is cooled by the cooling device, so that heat exchange by the casing is efficiently performed, and the cooling performance is further improved.

Furthermore, in the cooling fan motor according to the third aspect of the present invention, since the heating element is fixed to the casing and the cooling device is fixed by the holding portion of the fastening member, the heating element and the cooling device are fixed to the casing by the fastening member. Can be simultaneously fixed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a cooling fan motor according to the present invention will be described below with reference to FIGS. Reference numeral 1 denotes a casing, which is made of, for example, aluminum and aluminum alloy, copper and copper alloy, or a material having excellent heat conductivity such as gold, silver, and magnesium. The casing 1 is formed in a relatively thin square shape, and a centrifugal flow fan 2 and a circular recess 4 for mounting a motor 3 serving as a drive unit of the centrifugal flow fan 2 are provided on the upper surface thereof.
Is formed. The recess 4 has a radially outwardly extending channel 5, which is open on one side of the casing 1.

The centrifugal flow fan 2 is composed of a large number of blade pieces 6 whose sections are curved in an arc shape. Each wing piece 6 is arranged in a cylindrical shape at an interval from each other, and one end of each wing piece 6 is connected to a connecting plate 7, and this connecting plate 7 is connected to a rotor 3 </ b> A of the motor 3. I have. As described above, by attaching the centrifugal flow fan 2 to the motor 3, the centrifugal flow fan 2 is assembled inside the concave portion 4 with the outer periphery thereof being kept at a constant distance from the inner peripheral surface of the concave portion 4. And
By the rotation of the centrifugal flow fan 2 by the motor 3, the inflow air sucked from the front opening 4 </ b> A of the recess 4 is sent to the outside of the casing 1 through the flow path 5.

On the upper surface side of the casing 1, there is formed a recessed groove portion 11 for attaching a cooling body 10 such as a heat pipe as a cooling device thermally connected to the casing 1. . The groove 11 is formed in an arc shape along the outer periphery of the recess 4. Further, a heating element 14 is thermally connected to the back side of the casing 1. The heating element 14 and the casing 1 are fixed by a pair of screws 15 as fastening members, and an insertion hole 16 for the screw 15 is formed in the casing 1 and a screw hole 17 is formed in the heating element 14 at a corresponding position. Have been. Also, the insertion hole 16
Is formed so as to be located at a diagonal corner of the casing 1 and close to the groove portion 11, while the screw 15 penetrates a washer 18 as a holding portion. As a result, when the screw 15 is inserted with the washer 18 interposed therebetween, the washer 18 is interposed between the head 15A of the screw 15 and the casing 1 and the groove 11 is inserted.
The cooling body 10 that projects upward and is fitted into the groove 11 can be held in the casing 1 by the washer 18.

Next, the operation of the above configuration will be described. The heat generated by the heating element 14 is transmitted to the casing 1 having excellent heat conductivity. Then, by the rotation of the centrifugal flow fan 2 by the motor 3, the inflow air sucked from the front opening 4 </ b> A of the recess 4 is blown out of the casing 1 through the flow path 5 of the recess 4. At this time, the inflow wind sucked from the front opening 4A of the recess 4 changes its direction from the vertical direction (the rotation axis direction of the centrifugal fan 2) to the horizontal direction (the radial direction of the centrifugal fan 2). Flows along the inner circumference of the Thereby, the casing 1 is cooled by the airflow K generated in the recess 4 by the rotation of the centrifugal flow fan 2 and the air flowing from the front opening 4A of the recess 4. At the same time, a cooling body 10 is thermally connected to the casing 1, and the cooling body 10
Because the casing 1 is directly cooled by
The heat is efficiently transmitted from the heating element 14 to the casing 1 for heat exchange.

According to the configuration of the above embodiment, the casing 1 of the centrifugal flow fan 2 is made of a material having excellent thermal conductivity such as aluminum, and the heat generated by the heating element 14 which is thermally connected to the casing 1. Is efficiently transmitted to the casing 1 for heat exchange. The casing 1 includes a centrifugal flow fan 2.
, The air flow K generated in the recess 4 by the rotation of the centrifugal fan 2 and the front opening 4A of the recess 4
The casing 1 is cooled by the air flowing from the casing 1.
As shown in FIG. 4, the centrifugal flow fan 2 used for cooling the casing 1 does not have a sagging region in the air flow and static pressure characteristics unlike the axial flow fan, so that the cooling performance does not drop. Further, since the cooling body 10 is thermally connected to the groove 11 formed in the casing 1, the cooling performance of the casing 1 is further improved by the cooling body 10, so that the heat exchange of the heating element 14 by the casing 1 is more efficient. Become Further, since the groove 11 into which the cooling body 10 is fitted is formed along the outer periphery of the concave portion 4, the rotation of the centrifugal flow fan 2 generates an air flow K (centrifugal flow) along the inner peripheral surface of the concave portion 4. Therefore, the cooling performance of the casing 1 is further improved by the cooling by the airflow K (centrifugal flow) and the cooling by the cooling body 10 fitted in the groove 11. Further, since the cooling body 10 fitted into the groove 11 is held by the washer 18 penetrating the screw 15, the casing 1 and the heating element 14 are held by the screw 15.
At the time of fixing, the cooling body 10 can be fixed at the same time by the washer 18 penetrating the screw 15, and the assembling workability is excellent.

Next, the second embodiment of the cooling fan motor of the present invention will be described.
An embodiment will be described with reference to FIGS. In addition,
Portions having the same functions as those of the first embodiment are denoted by the same reference numerals, and description of overlapping portions will be omitted, and only different portions will be described. In the present embodiment, the rotor 3A of the motor 3
And a plurality of connecting pieces in which a plurality of wing pieces 6 are formed in a spoke shape
Connected at 20. These connecting pieces 20 form an inclined portion 21 which is linearly inclined as shown in FIG. 9 (a) or an arc portion which is curved in an arc as shown in FIG. 9 (b).
By forming the link 22, the connecting piece 20 functions as the axial fan 23. Further, a thin flange portion 24 is integrally formed so as to cover the wing piece 6 from the periphery of the front opening 4A of the recess 4 toward the inside.

As described above, in this embodiment, the inclined portion 21 or the arc portion 22 is formed in the spoke-shaped connecting piece 20 for connecting the rotor 3A of the motor 3 and the blade piece 6 of the centrifugal flow fan 2. The connecting piece 20 functions as the axial fan 23. Therefore, by the rotation of the centrifugal flow fan 2, the inflow air sucked from the front opening 4 </ b> A of the concave portion 4 flows along the inner peripheral surface of the concave portion 4 by the large number of blade pieces 6 constituting the centrifugal flow fan 2. The casing 1 is cooled by the airflow K which is blown out of the casing 1 from the passage 5 and flows into the recess 4 and the air flowing from the front opening 4A of the recess 4, and further connects the centrifugal flow fan 2 and the motor 3. Inclined part 21 of piece 20
Alternatively, the air is sucked in the direction of the rotation axis of the centrifugal flow fan 2 by the arc portion 22 and flows toward the bottom of the concave portion 4, so that the cooling performance of the casing 1 is further improved. That is, in the centrifugal flow fan 2, the inflow wind sucked from the front opening 4 </ b> A of the recess 4 changes its direction from the vertical direction (the rotation axis direction of the centrifugal flow fan 2) to the horizontal direction (the radial direction of the centrifugal flow fan 2). While the air flows along the inner peripheral surface of the recess 4, it is difficult for air to flow into the bottom of the recess 4, but the connecting piece
20 functions as the axial fan 23, an air flow K1 is generated in which the air sucked from the front opening 4A of the recess 4 goes to the bottom of the recess 4, and the air flows K1 along the inner peripheral surface of the recess 4 due to the rotation of the centrifugal fan 2. The cooling performance of the casing 1 is improved in combination with the generated airflow K. Also, since the cooling of the casing 1 is mainly performed by the centrifugal flow fan 2, even if the gap t on the suction side, that is, the opening 4A side of the concave portion 4 becomes small, the deterioration of the cooling performance is small and the noise is suppressed. Can be.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments.
Various modifications can be made within the scope of the present invention.
For example, in the first embodiment, the screw 15 is used to fix the heating element 14, but as shown in FIG. 10, the rivet pin 30 is projected from the heating element 14 side to the surface of the casing 1,
The protruding end was crimped to fix the casing 1 and the heating element 14, and further fitted into the groove 11 of the casing 1 by a washer 18 interposed between the crimping portion 30 </ b> A of the rivet pin 30 and the casing 1. The cooling body 10 may be fixed, and the means for fixing the heating element 14 and the casing 1 may be appropriately selected. Furthermore, although the groove 11 into which the cooling body 10 is fitted is formed along the outer periphery of the concave portion 4, it is not always necessary to follow the concave portion 4, and the shape is not limited to the concave shape but may be a semicircular shape. Further, in the second embodiment, the number, shape, and the like of the connecting pieces constituting the axial fan may be appropriately selected.

[0016]

According to the cooling fan motor of the first aspect of the present invention, the heat generated by the heating element is efficiently transmitted to the casing, and the slack region does not occur in the air volume and static pressure characteristics of the centrifugal fan. No drop in cooling performance,
Cooling performance can be improved.

Further, according to the cooling fan motor of the second aspect of the present invention, by cooling the casing of the cooling fan motor by the cooling device, heat exchange by the casing is efficiently performed, and the cooling performance is further improved.

Further, according to the cooling fan motor of the third aspect of the present invention, since the heating element and the cooling device can be simultaneously fixed by the fixing member, the assembling workability is also improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a cooling fan motor according to a first embodiment of the present invention.

FIG. 2 is a side view of the cooling fan motor.

FIG. 3 is a sectional view of the cooling fan motor.

FIG. 4 is a graph comparing the air volume / static pressure characteristics of the centrifugal fan and the axial fan.

FIG. 5 is a plan view of a cooling fan motor according to a second embodiment of the present invention.

FIG. 6 is a sectional view of the centrifugal fan according to the first embodiment;

FIG. 7 is a perspective view of the same centrifugal flow fan.

FIG. 8 is a plan view of the centrifugal flow fan.

9 is a cross-sectional view taken along the line AA of FIG. 8; FIG.
Indicates an inclined connecting piece, and FIG. 9B illustrates an arc-shaped connecting piece.

FIG. 10 is a sectional view showing a modified example of the fastening member of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Centrifugal flow fan 3 Motor (drive part) 4 Concave part 6 Wing piece 10 Cooling body (cooling equipment) 11 Groove part (mounting part) 14 Heating element 15 Screw (fixing member) 18 Washer (holding part)

Claims (3)

[Claims] 1. A vehicle comprising: a casing; a fan disposed in the casing; and a drive unit for driving the fan.
A cooling fan motor, wherein the casing is formed of a good heat conductive material, and the fan is a centrifugal fan in which a number of blade pieces are arranged in a cylindrical shape. 2. The cooling fan motor according to claim 1, wherein the casing is provided with a mounting portion to which a cooling device is thermally connected. 3. The cooling fan according to claim 2, further comprising a fixing member for fixing the casing and the heating element, wherein the fixing member has a holding portion for holding the cooling device in the casing. motor.