JP2003269393A - Axial fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axial fan generating high wind pressure. <P>SOLUTION: This axial fan for electronic equipment is constituted so that a ring-shaped centrifugal blower type impeller 3 is rotatably arranged on a common shaft in a housing 2 having a cylindrical inner peripheral surface 4a by an outer rotor type electric motor 10, air taken in from a suction hole 5 arranged in a suction side end surface of the housing 2 is pressurized by the impeller 3 in an axial flow forming chamber 19 of a hollow cylindrical shape formed of an inner peripheral surface 4a of the housing 2 and an outer peripheral surface 15 of an impeller 3, and is then made to flow to the axial directional air delivery side by the axial flow forming chamber 19, and the pressurized air is delivered outside the housing 2 via an air delivery hole 8 arranged in an air delivery side end surface of the housing 2, and efficiently cools the electronic equipment mounted with a highly integrated electronic element. <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 cooling fan for cooling electronic equipment, and more particularly to an axial cooling fan for cooling highly integrated electronic equipment with high performance.

[0002]

2. Description of the Related Art A conventional axial cooling fan for electronic equipment was originally developed to cool electronic equipment having an electronic tube such as a vacuum tube installed therein, and its impeller is designed to cool air in the axial direction of the cooling fan. Composed of propeller-shaped blades for sending to. The design of this conventional cooling fan is
It must be designed to provide the required airflow to cool the electronics and must generate the required air pressure. However, in such an electron tube type electronic device, since the distance between the internal electronic elements is large and the air flow passage is large, a sufficient air volume can be obtained even if the air pressure is small, so that the air pressure measures are secondary. It was a thing.

Next, even when semiconductor elements have been adopted in electronic equipment, since there is a sufficient space between the mounted electronic elements, a conventional propeller-type axial cooling fan can obtain a required air volume. It was

However, as integrated circuits have been used for electronic elements, and as they have been highly integrated, the distance between electronic elements in electronic equipment has become extremely small, and the path between them has become narrow, resulting in a normal state. Then, there is a problem that air cannot be sufficiently passed. In order to sufficiently pass the air through such a narrow passage, a high air pressure may be generated by the cooling fan. Therefore, in the conventional cooling fan, the space between the outer circumference of the propeller blade and the inner peripheral surface of the fan housing may be reduced to reduce the amount of air flowing backward through this space. Due to the restriction on the shape of the outer peripheral surface, there was a limit to making this interval as small as necessary, and a sufficient wind pressure could not be obtained.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to use a ring-shaped centrifugal blower type impeller as an impeller and to make an air flow passing through a cooling fan into an axial flow. It is an object of the present invention to provide an axial cooling fan for electronic equipment, which can efficiently cool the equipment with a high air pressure and a required air volume.

[0006]

In order to solve such a problem, an axial fan according to the present invention has an electric motor having a rotor which rotates about an axis, a plate-shaped fan, and a central part of the motor. An intake-side end plate having an intake hole penetrating in the thickness direction of the plate shape, and a rim portion having a triangular cross section formed on the outer peripheral portion of the one plate-shaped inner surface, and the plate shape And a discharge side end plate on which the electric motor is attached so that the shaft is perpendicular to the plate shape and a gas discharge hole penetrating in the thickness direction of the discharge plate is formed. A central portion of the disc is attached to the rotor, one face of the disc-shaped member faces the discharge-side end plate with a predetermined gap therebetween, and the disc rotates with the rotor; Is erected on the other surface of the rotary plate and moves circularly with the rotation of the rotary plate. A plurality of blades that respectively radiate the obtained gas in the centrifugal direction and a tubular shape are formed, and one end of the tubular shape supports the peripheral portion of the discharge side end plate, and the other end of the tubular shape of the intake side end plate The peripheral part is supported so that the intake side end plate and the discharge side end plate are parallel to each other, and the electric motor, the rotary plate and a plurality of blades are housed inside the tubular shape, and the plurality of blades and the tubular shape are accommodated. The pressure of the radiated gas between the inner peripheral surface and the intake side end plate is increased, and the gas having the increased pressure is applied to the gas discharge hole through the gap, and the pressure is increased from the gas discharge hole. And a housing for delivering the increased gas as a gas having a flow parallel to the axis. The plurality of blades are arranged at a predetermined interval in the circumferential direction of the rotary plate, and the intake side end plate side of the plurality of blades has an outer diameter outside the plurality of blades that move circularly. A ring-shaped intake-side end plate having a diameter equal to the outer peripheral surface defined by the ends and an inner diameter equal to or larger than the diameter of the inner peripheral surface defined by the inner ends of the plurality of blades may be formed. Also,
The plurality of blades are arranged at a predetermined interval in the circumferential direction of the rotary plate, and a circular rim for reinforcing the plurality of blades is formed on the intake side end plate side of the plurality of blades. It may have been done. Further, each of the blades,
It may be convexly curved in the direction of the circular movement. Also,
Each of the blades may be a flat plate. Further, a protrusion having a mounting hole may be formed on the outer peripheral surface of the one end or the other end of the tubular shape of the housing.

According to the present invention, since the axial fan is constructed as described above, the plurality of blades rotate with the rotation of the rotor, and the gas given from the intake holes is radiated in the centrifugal direction. The radiated gas is compressed between the cylindrical inner peripheral surface of the housing, the plurality of blades, and the intake side end plate to increase the atmospheric pressure. The gas whose atmospheric pressure is increased is converted into an axial flow and discharged from the gas discharge hole. Therefore, the above problem can be solved.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an axial cooling fan for electronic equipment according to the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of an axial cooling fan (hereinafter, simply referred to as a cooling fan) of the present invention.
The cooling fan 1 includes a housing 2, a centrifugal blower type impeller (hereinafter simply referred to as “impeller”) 3 arranged therein, and an outer rotor type electric motor 10 that supports and rotates a central portion thereof. Consists of.

The housing 2 has a cylindrical body 4 having a cylindrical inner peripheral surface 4a, and a ring-shaped intake side having a circular intake hole 5 formed at one end of the body 4. The end plate 6 is fixed. Further, a disk-shaped air discharge side end plate 7 is formed at the other end of the body portion 4, and fan-shaped air discharge holes 8 are formed on the outer peripheral portion thereof by a support web 9 extending in the radial direction so as to be circumferentially spaced. Are placed. As shown in FIGS. 2 to 4, both end plates 6 and 7 are formed in a square shape, and a corner portion (projection) 6a protruding outward from the body portion 4 in the radial direction is formed.
Mounting holes 6b and 7b are formed in each 7a. Therefore, the cooling fan of this embodiment is of a rectangular type.

An outer rotor type electric motor 10 is provided in the center of the housing 2, and a stator 22 of the outer rotor type electric motor 10 is fixed to the center of the inner surface of the air discharge side end plate 7.
A rotor 11 is provided around the circumference of 2.

The impeller 3 is also a disk-shaped end plate 1 on the air discharge side.
2 has a boss portion 13 that extends toward the intake side and is fitted and fixed to the rotor 11 of the electric motor 10 at the center thereof, and has a plurality of blades extending from the outer peripheral portion of the inner surface of the end plate 12 toward the intake side. 14 is projected. As shown in the upper side of FIG. 1, a ring-shaped intake side end plate 20 is provided at the intake end of the blade 14.
Is provided. The inner diameter of the end plate 20 is the same as or slightly smaller than the diameter of the intake hole 5 of the housing 2. Further, the end plate 20 is formed so that the outer surface thereof is extremely close to the inner surface of the intake side end plate 6 of the housing 2, and air between the both surfaces is suppressed as much as possible toward the intake hole. Further, as shown in the lower side of FIG. 1, a circular rim 21 may be provided instead of the end plate 20 in order to reinforce the outer peripheral portion of the intake side end of the blade 14.

As shown in FIG. 4, these blades 14 are arranged at equal intervals in the circumferential direction of the end plate 12, and their outer ends and inner ends are cylindrical outer peripheral surface 15 and cylindrical shape, respectively. The inner peripheral surface 16 is defined, and the diameter of the outer peripheral surface 15 is equal to the outer diameter of the air side end plate 20. These blades 14 are inclined from the outer peripheral surface 15 toward the inner peripheral surface 16 in the rotation direction R of the impeller 3, and at the same time, preferably, the spiral winding which is convexly curved in the rotation direction R (for example,
Part of the ellipse). The shape of this blade 14 is
An appropriate one is selected according to the size of the impeller 14, the size / inclination angle / number of the blades, the desired air pressure, the desired air volume, etc.,
When the wind pressure generating performance may be slightly lowered, each blade 14 may be formed of a flat plate as shown in the lower side of FIG.

A ring-shaped air flow axial flow conversion chamber 19 is formed between the outer peripheral surface 15 of the impeller 3 and the cylindrical inner peripheral surface 4a of the body 4 coaxial therewith, and this is an air discharge side. End plate 7
It is adapted to communicate with the air discharge hole 8 of. In addition, a rim portion 6c having a triangular cross section is formed on the outer peripheral portion of the inner surface of the intake side end plate 6 to restrict air from flowing into the space between the intake side end plates 6 and 20 from the air flow axialization chamber 19. ing.

FIG. 5 shows the air pressure-air flow characteristic curves 17 and 18 of the axial cooling fan of the present invention equipped with a centrifugal blower type impeller and the conventional axial flow cooling fan equipped with a propeller type impeller, respectively, as solid lines. Is indicated by a dotted line. Both impellers have the same dimensions. The units of wind pressure and air volume are usually expressed in millimeters (water column) and cubic meters / minute, respectively. From these characteristics, on the left side of the intersection A of both curves, the cooling fan of the present invention generates a larger wind pressure than the conventional cooling fan for the same air volume, and at the same operating point B, the cooling fan of the present invention. Is larger than the conventional cooling fan (about 2 in the example of FIG. 5).
You can see that the Therefore, it is apparent that the present invention can cool the electronic device with higher efficiency than ever before.

Next, the operation of the cooling fan 1 of this embodiment will be described.

When the cooling fan 1 is used for sending air to an electronic device having an electronic element having an integrated circuit, a bolt is passed through the mounting hole 6b and an air discharge side end plate 7 is provided.
With the inside facing, the corner 6a of the intake side end plate 6 is attached around the attachment hole of the electric device. When the cooling fan 1 draws air from the electronic device and discharges it out of the device, a bolt is passed through the mounting hole 7b so that the intake side end plate 6 is inside and the corner of the air discharge side end plate 7 is located. The portion 7a is attached around the attachment hole of the electric device. In any case, the cooling fan 1 is embedded in the electronic device so that it does not get out of the way by protruding outside the device.

When the electric motor 10 is operated to rotate the impeller 3 in the direction indicated by R in FIG. 4, air is taken in from the intake hole 5 while the blade 14 increases the pressure to a high pressure in accordance with the characteristics shown by the solid line in FIG. It is sent to the outside in the radial direction of 3. The air thus sent out is sent to the axial direction and the air discharge side of the housing 2 in the air flow axial flow chamber 19 around the impeller 3, and is discharged through the air discharge hole 8.

When the cooling fan 1 is used for intake air, it generates a high negative pressure in the equipment and the space between the electronic elements, that is,
Air can be passed through the air passage with a large amount of air to cool these electronic elements sufficiently, and when the cooling fan 1 sends air into an electronic device, a large positive wind pressure is generated in the device. As in the case where negative pressure is applied, the electronic device in the device can be sufficiently cooled.

FIG. 6 shows a second embodiment of the cooling fan of the present invention. This cooling fan 51, except for mounting means,
The cooling fan of the first embodiment has the same structure and operation. The mounting means is the housing 2 in the first embodiment.
Although the mounting holes are formed at the corners of the both end plates of the square shape of the second embodiment, the second embodiment is configured so that the outer peripheral surface of the cylindrical housing 52 is substantially half-shaped on the intake side end and the air discharge side end, respectively. A plurality of circular protrusions 73 and 74 are formed in the circumferential direction of the housing 52 (four at equal intervals in the present embodiment), and mounting holes 75 and 76 are formed in these. It is configured. The outer rotor electric motor 60 and the blade 64 are the same as the outer rotor electric motor 10 and the blade 14 of the first embodiment, respectively.

In the first embodiment described above, the end plates of the housing are square, but they may be other regular polygons or may be general polygons. Furthermore, in the second embodiment, the protrusions 73 and 74 are semi-circular, but they may have other shapes depending on the purpose of attachment. In addition, when the cooling fan is dedicated to intake air or air
The mounting means may be provided only on the air discharge side of the housing or only on the intake side of the housing.

[0022]

As described above, according to the present invention, the gas radiated in the centrifugal direction by the rotation of the plurality of blades is compressed between the inner peripheral surface of the housing and the plurality of blades to increase the pressure. Of the gas having a flow parallel to the rotation axis of the rotor is applied to the gas projecting hole, so that, for example, an electronic device in which an electronic element having an integrated circuit with a high degree of integration is mounted is installed. There is an effect that it can be cooled effectively.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of an axial cooling fan for electronic equipment according to the present invention.

FIG. 2 is a view of the cooling fan of FIG. 1 viewed from an intake side.

FIG. 3 is a view of the cooling fan of FIG. 1 viewed from the air discharge side.

FIG. 4 is a sectional view taken along line 5-5 in FIG.

FIG. 5 is an air pressure-air volume characteristic diagram of the cooling fan of the present invention and a conventional cooling fan.

FIG. 6 is a perspective view of an axial cooling fan for electronic equipment according to a second embodiment of the present invention as seen from an intake side.

[Explanation of symbols]

1 Cooling fan of the first embodiment 2 housing 3 impeller 4 torso 4a Inner surface 5 intake holes 6 Intake end plate of housing 6a Corner (projection) 6b Mounting hole 6c rim part 7 Housing end plate on air discharge side 7a Corner (projection) 7b Mounting hole 8 Air discharge hole 10 Outer rotor motor 11 rotor 12 Impeller air discharge side end plate 14 blade 15 outer peripheral surface 16 Inner surface 17 Wind pressure-air volume characteristics of the cooling fan of the present invention 18 Wind pressure-air volume characteristics of conventional cooling fans 19 Air flow shaft sulfurization chamber 20 Intake side end plate of impeller 21 rim 22 Stator 51 Cooling Fan of Second Embodiment 52 housing 60 Outer rotor motor 64 blade 73 Protrusion 74 Protrusion 75 mounting holes 76 mounting hole R Impeller rotation direction B operating point

Claims (6)

[Claims] 1. An electric motor having a rotor that rotates about an axis, and a plate-shaped one surface that is an inner surface and is formed with an intake hole penetrating in the thickness direction of the plate-shaped in the center thereof. An intake-side end plate having a rim portion with a triangular cross section formed on the outer peripheral portion of the plate, and a plate-shaped gas discharge hole penetrating in the thickness direction of the plate-shaped member; A discharge side end plate to which the electric motor is attached so as to be vertical, and a disc shape, and a center portion of the disc shape is attached to the rotor with a predetermined gap provided in the discharge side end plate. A disk-shaped one surface faces each other, and a rotary plate that rotates together with the rotor is erected on the other disk-shaped surface of the rotary plate, and circularly moves with the rotation of the rotary plate. Cylindrical shape with multiple blades that emit the gas given from the holes in the centrifugal direction. One end of the cylinder supports the peripheral part of the discharge side end plate, and the other end of the cylinder supports the peripheral part of the intake side end plate such that the intake side end plate and the discharge side end plate are parallel to each other. The pressure of the radiated gas between the plurality of blades, the inner peripheral surface of the cylinder, and the intake side end plate, which accommodates the electric motor, the rotary plate, and the plurality of blades inside the cylinder. And a housing for delivering the gas having the increased pressure to the gas discharge hole through the gap, and delivering the gas having the increased pressure from the gas discharge hole as a gas having a flow parallel to the axis. An axial fan characterized by having. 2. The plurality of blades are arranged at a predetermined interval in the circumferential direction of the rotary plate, and the plurality of blades have a plurality of circular outer diameter movements on the intake side end plate side. A ring-shaped intake side end plate having a diameter equal to that of the outer peripheral surface defined by the outer ends of the blades and having an inner diameter not less than the diameter of the inner peripheral surface defined by the inner ends of the plurality of blades. The axial fan according to claim 1. 3. The plurality of blades are arranged at predetermined intervals in the circumferential direction of the rotary plate, and the plurality of blades are provided on the intake side end plate side to reinforce the plurality of blades. The axial flow fan according to claim 1 or 2, wherein a circular rim is formed. 4. The axial fan according to claim 1, wherein each of the blades is convexly curved in the direction of the circular movement. 5. The axial fan according to claim 1, wherein each of the blades is a flat plate. 6. The protrusion according to claim 1, wherein a protrusion having a mounting hole is formed on an outer peripheral surface of one end or the other end of the cylindrical shape of the housing. Axial fan.