JP2003273557A - Axial flow fan motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axial flow fan motor that emits low noise and produces high static pressure. <P>SOLUTION: An axial flow cooling fan motor 1 that is provided within an electronic device which has a builtin heat releasing part in an enclosure is provided with; an electrically-driven motor 2; a blowing member 3 that is rotated in a specified direction by the motor 2 and is provided with a spiral fin 6 on the outside of a rotary driven member 5 whose outer circumference is circular in section; and a case 4 covering at least the rotation area of the fin 6. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axial fan motor for cooling, which is built in electronic equipment such as a computer.

[0002]

2. Description of the Related Art An axial fan motor having an axial fan such as an impeller in a case is generally used for cooling the above-mentioned electronic equipment. The improvement of cooling efficiency by such an axial fan motor is achieved by increasing the static pressure, and the high static pressure is easily realized by using a plurality of stages of impellers and the like. In other words, the blade projected area increases due to the multistage structure of the impeller and the like, and as a result, the amount of wind power sent increases.

[0003]

However, although the method of providing the impeller or the like in a plurality of stages is easy to apply, air interference between the moving blades or the stationary blades in the next stage, for example, air There is a problem that a backflow occurs, and a large noise is generated due to the vibration and the like accompanying it.

The present invention has been made in order to solve the above problems of the prior art, and an object of the present invention is to provide an axial fan motor which produces low static noise and high static pressure.

[0005]

An axial fan motor according to the present invention is an axial fan motor for cooling a heat generating component arranged in an electronic device in which a heat generating component is built in a casing, the electric motor comprising: Is driven to rotate in a certain direction by the electric motor,
It is characterized by further comprising: a blower member provided with a spiral fin on the outer side of a rotary drive member having an outer periphery of a circular cross section; and a case for covering at least a rotation region of the fin.

In the axial fan motor of the present invention, since the blades of the blower member are composed of spiral fins, air is sequentially sent along the fins from the inflow side to the outflow side, and the air flows backward. The noise is low and a high static pressure is obtained.

In the axial fan motor of the present invention, the rotary drive member is formed so that the gap between the rotary drive member and the case is smaller than the outflow side so that the outflow side is narrower than the outflow side. The width can be made to correspond to the above-mentioned gap so that the outflow side is shorter than the inflow side.

In this structure, since the gap between the case and the rotary drive member becomes narrower toward the outflow side, the pressure (static pressure) of the air sent to the outflow side along the spiral fin is high. As a result, the air discharged from the fan motor is easily moved to a long distance, and the cooling efficiency is improved.

In the axial fan motor of the present invention, the rotation driving member has an inner cavity opened at one end side and a base end fixed to a shaft center portion on the other end side in the inner cavity in the axial direction. A support shaft having a distal end extending along the same, and the case is provided with a bearing part connected to a tubular part covering the rotation region of the fin and rotatably supporting the support shaft. Rotatably supporting the support shaft, the electric motor includes a plurality of stator cores arranged around the bearing portion, coils wound around the respective stator cores, and an inner cavity inner wall of the rotation drive member. A plurality of magnets may be arranged in the above.

According to this structure, since the electric motor is provided inside the rotary driving member, the fan motor can be easily miniaturized.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below.

(First Embodiment) FIG. 1 is a front sectional view showing a state in which the axial fan motor of the first embodiment is built in a housing of a personal computer, and FIG.
FIG. 3 is a right side view showing the axial fan motor of the first embodiment, and FIG. 4 is a front view showing the axial fan motor of the first embodiment. FIG.

As shown in FIG. 1, the housing 10 of the personal computer is of a thin type having an air inlet 11 formed on its side surface, and inside the housing 10, a heat-generating component 13 and other electronic components are provided. The mounted substrate 12 mounted is built in, and the axial fan motor 1 of the present embodiment is built in near the air inlet 11.

In this embodiment, the axial fan motor 1 cools the heat-generating component 13 mounted on the mounting board 12, and as shown in FIGS. It has a blower member 3 which is rotationally driven in a fixed direction by the electric motor 2, and a case 4 which rotatably supports the blower member 3 and covers the rotation range of the blower member 3.

The blower member 3 has a bottomed cylindrical rotary drive member 5 having a constant outer diameter over its entire length, and a spiral fin 6 integrally formed on the outer side of the rotary drive member 5. The fins 6 are formed with a constant width L over their entire length, and the spiral direction is determined so that the rotation driving member 5 rotates to blow air to the mounting substrate 12 side. Further, the rotation driving member 5 has an internal cavity 5a whose one end side (right side in FIG. 4) is open, and a cylindrical support shaft 5b is formed inside the internal cavity 5a. This support shaft 5b
Has a tip 5d extending from the base end 5c fixed to the shaft center portion on the other end side (the left side in FIG. 4) in the internal cavity 5a toward the one end side along the axial direction.

The case 4 is provided with a tubular portion 4a that covers the rotation region of the blower member 3, and a side wall 4b provided on one end side (right side in FIG. 4) of the tubular portion 4a and having a plurality of air suction ports 4c formed therein.
And a bearing portion 4d provided on the side of the side wall 4b on the side of the side of the side portion 4a so as to pass on the axis of the side portion 4a. A plurality of connecting portions 4e for connecting to the end portions on the side are provided. The air inlets 11 are formed in the same size and number as the air inlets 4c, and the case 4 is attached to the housing 10 so that the air inlets 11 are aligned with the respective air inlets 11. ing. The cylindrical portion 4a functions as an air inflow side on one end side (right side in FIG. 4) provided with the air suction port 4c and an air outflow side on the other end side (left side in FIG. 4). The opening 4f on the side is directed to the heat generating component 13 of the mounting board 12 and the like.

The bearing portion 4d has a tip end side (left side in FIG. 4).
Is a cylindrical portion with an opening, and the support shaft 5b is inserted into the circular hole in the cylindrical portion.
Is rotatably supported.

The electric motor 2 is provided inside the internal cavity 5a of the rotary drive member 5, and a plurality of stator cores 2a are arranged around the bearing portion 4d and coils 2b wound around each stator core 2a. And a plurality of magnets 2c arranged on the inner wall of the inner cavity 5a of the rotation driving member 5.

The axial fan motor 1 of the first embodiment thus constructed operates as follows. That is, when the coil 2b of the electric motor 2 is energized, the rotation driving member 5 to which the magnet 2c is attached rotates and the fin 6 rotates,
Air flows into the case 4 from the outside through the air inlet 11 and the air suction port 4c. The introduced air is guided in a spiral shape along the fins 6. At this time, since the air sequentially moves along the fins 6 toward the opening 4f (outflow side), the backflow of air does not occur. Therefore, noise is low and high static pressure can be obtained. After that, air flows out from the opening 4f toward the heat-generating component 13 of the mounting board 12 and the like, and the heat-generating component 13 and the like are cooled.

(Second Embodiment) FIG. 5 is a front view showing an axial flow fan motor according to a second embodiment with its case cut away. The same parts as those in FIGS. 2 to 4 are designated by the same reference numerals.

This axial fan motor 1A differs from the first embodiment in that the rotary drive member 5A and the spiral fin 6 are provided.
A is different. The rotation driving member 5A is formed such that the air inflow side (right side in FIG. 5) is gradually smaller in diameter than the outflow side (left side in FIG. 5), and the gap D with the case 4 is formed.
The outflow side is gradually narrower than the inflow side. On the other hand, the fin 6A is formed such that the width dimension L thereof is gradually shorter on the outflow side than on the inflow side so as to correspond to the gap. In addition, inside the rotation driving member 5A, the first
An electric motor is built in like the embodiment.

In the case of the second embodiment, the gap D between the case 4 and the rotary drive member 5A becomes narrower toward the outflow side, so that the air sent to the outflow side along the spiral fins 6A. The pressure increases. For this reason, the air flowing out from the axial fan motor 1A easily moves to a long distance, and the cooling efficiency can be improved.

In the first and second embodiments described above, the length of the spiral fins 6 and 6A is not clearly stated, but the present invention may have any length. However, when viewed from the axial direction of the rotary drive members 5 and 5A, the fins 6 and 6A have an angle of one rotation or more as compared with the case where the fins 6 and 6A are formed at an angle shorter than one rotation of the rotary drive member, that is, an angle smaller than 360 °. That is, it is preferable to form the blade at an arbitrary angle of 360 ° or more because the blade area can be increased and a higher static pressure can be obtained.

In the above-described first and second embodiments, the spiral fins 6 and 6A have a single thread, but the present invention is not limited to this. For example, as shown in FIG. 6, the two fins 6, 6 may be formed in a spiral shape with their angles being different by 180 ° around the axis of the rotary drive member 5 without intersecting each other. Alternatively, although not shown, three or more fins may have a spiral shape with different angles around the axis of the rotary drive member without intersecting each other. When arranging two or more fins in this way, the angles between the adjacent fins do not necessarily have to be uniform, and may be different.

In both the first and second embodiments described above, since the case is provided so as to support the support shaft of the blower member with the bearing portion, the tubular portion that covers the rotation range of the fins is provided. Not only this but the side wall (4b) on the one end side is also provided, the present invention is not limited to this. For example, when adopting a configuration in which the support shaft of the blower member is supported by a bearing portion provided in a member different from the case, the case may be covered only in the region where the fins rotate.

[0026]

As described above in detail, in the case of the present invention, since the blades of the blower member are composed of spiral fins, air is sequentially sent from the inflow side to the outflow side along the fins. Backflow of air does not occur, noise is low, and high static pressure is obtained.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a state in which an axial fan motor according to a first embodiment of the present invention is built in a housing of a personal computer.

FIG. 2 is a front view showing the axial fan motor of FIG. 1 with a case cut away.

FIG. 3 is a right side view of the axial fan motor of FIG.

4 is a vertical cross-sectional view of the axial fan motor of FIG.

FIG. 5 is a vertical sectional view showing an axial fan motor according to a second embodiment of the present invention.

FIG. 6 is a vertical sectional view showing another axial fan motor according to the present invention.

[Explanation of symbols]

1,1A axial fan motor 2 electric motor 3 Blower member 4 cases 5, 5A rotation drive member 6,6A spiral fin 10 Personal computer housing 13 Heat generating parts

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takayuki Kishi             55 Mimizuguchi-cho, Mizuno, Hino-gun, Tottori Prefecture             Honden Electronics Co., Ltd. Tottori Technology             In the development center (72) Inventor Hirotsugu Yokotani             55 Mimizuguchi-cho, Mizuno, Hino-gun, Tottori Prefecture             Honden Electronics Co., Ltd. Tottori Technology             In the development center (72) Inventor Yusuke Yoshida             55 Mimizuguchi-cho, Mizuno, Hino-gun, Tottori Prefecture             Honden Electronics Co., Ltd. Tottori Technology             In the development center F-term (reference) 5E322 BA04 BB02

Claims (3)

[Claims] 1. An axial fan motor for cooling a heat-generating component, which is arranged in an electronic device having a heat-generating component built-in in a casing, comprising: an electric motor and a motor driven to rotate in a certain direction by an outer periphery. An axial flow fan motor comprising: a blower member provided with a spiral fin on the outer side of a rotation driving member having a circular cross section; and a case covering at least a rotation region of the fin. 2. The rotary drive member has an inflow side having a diameter smaller than that of the outflow side so that a clearance between the rotation drive member and the case is narrower on the outflow side than on the inflow side. The axial fan motor according to claim 1, wherein the outflow side is shorter than the inflow side. 3. The rotation driving member has an inner cavity having an opening on one end side, and a tip end side extending in the axial direction from a base end fixed to a shaft center portion on the other end side of the inner cavity. A supporting shaft is provided, and the case is provided with a bearing portion that is connected to a tubular portion that covers a rotation region of the fin and that rotatably supports the supporting shaft, and the bearing portion can rotate the supporting shaft. The electric motor has a plurality of stator cores arranged around the bearing portion, coils wound around the respective stator cores, and a plurality of magnets arranged on the inner wall of the internal cavity of the rotary drive member. The axial fan motor according to claim 1 or 2, further comprising: