JP3640430B2 - Axial fan - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an axial cooling fan for cooling an electronic device, and more particularly to an axial cooling fan for cooling a highly integrated electronic device with high performance.
[0002]
[Prior art]
A conventional axial cooling fan for an electronic device was originally developed to cool an electronic device mounted with an electron tube such as a vacuum tube, and its impeller is used to send air in the axial direction of the cooling fan. It consists of a propeller blade. The design of this conventional cooling fan must be designed so as to obtain an air volume necessary for cooling the electronic equipment, and must generate a wind pressure necessary for that purpose. However, in such an electron tube type electronic device, the interval between the internal electronic elements is large and the air flow path is large, and a sufficient air volume can be obtained even if the wind pressure is low. It was a thing.
[0003]
Next, even when a semiconductor element is adopted in an electronic apparatus, a necessary air volume is obtained by a conventional propeller-type axial flow cooling fan because there is a sufficient interval between mounted electronic elements.
[0004]
However, as integrated circuits are used for electronic elements, and as they become highly integrated, the distance between the electronic elements in the electronic device becomes extremely small, and the passage between them becomes narrow. There is a problem that it cannot be fully passed. In order to sufficiently pass air through such a narrow passage, a high wind pressure may be generated by a cooling fan. For this reason, in the conventional cooling fan, the distance between the outer periphery of the propeller blade and the inner peripheral surface of the fan housing may be reduced to reduce the amount of air flowing back through this interval. Due to restrictions on the shape of the outer peripheral surface, there was a limit to making this interval as small as necessary, and sufficient wind pressure could not be obtained.
[0005]
[Problems to be solved by 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 an axial flow, thereby cooling an electronic device with a high wind pressure. An object of the present invention is to provide an axial flow cooling fan for electronic equipment that can be efficiently performed with an air volume.
[0006]
[Means for Solving the Problems]
In order to solve such a problem, an axial fan according to the present invention has an electric motor having a rotor that rotates about an axis and a plate-like shape, and a central portion thereof penetrates in the thickness direction of the plate-like shape. The electric motor has an intake-side end plate in which an intake hole is formed and a plate-like gas discharge hole penetrating in the thickness direction of the plate-like shape, and the shaft is perpendicular to the plate shape. And a disk-shaped end plate, and a disk-shaped central portion is attached to the rotor so that a predetermined gap is provided between the discharge-side end plate and the disk-shaped one surface is A rotating plate facing and rotating together with the rotor, and the other plate-like surface of the rotating plate are erected, and circularly move with the rotation of the rotating plate, and the gas supplied from the intake holes A plurality of blades each radiating in the centrifugal direction and a cylindrical shape, one end of the cylindrical shape on the discharge side Supporting the periphery of the plate, a peripheral portion of the intake side end plate in the tubular at the other end to the support as the intake-side end plate and said discharge outlet-side end plate are parallel, inwardly of the tubular The pressure of the radiated gas is increased between the plurality of blades, the cylindrical inner peripheral surface, and the intake side end plate while accommodating the electric motor, the rotating plate, and the plurality of blades, and the pressure is increased. gas through the gap provided in the gas discharge hole, characterized in that the gas of increased the pressure from the gas discharge holes and a housing for delivery in the gas with a flow parallel to the axis Axial fan.
The plurality of blades are arranged at predetermined intervals in the circumferential direction of the rotating plate, and the plurality of blades are arranged on the intake side end plate side of the plurality of blades whose outer diameters are circular. A ring-shaped intake side end plate having 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.
The plurality of blades are arranged at predetermined intervals in the circumferential direction of the rotating plate, and a circular rim for reinforcing the plurality of blades is provided on the intake side end plate side of the plurality of blades. May be formed.
The blades may be curved in a convex shape in the direction of the circular motion.
Each of the blades may be a flat plate.
In addition, a protrusion having an attachment hole may be formed on the outer peripheral surface of the cylindrical one end or the other end of the housing.
[0007]
[Action]
According to the present invention, since the axial flow fan is configured 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 emitted gas is compressed between the cylindrical inner peripheral surface of the housing , the plurality of blades, and the intake side end plate, and the atmospheric pressure increases. The gas whose atmospheric pressure is increased is converted into an axial flow and discharged from the gas discharge hole. Therefore, the problem can be solved.
[0008]
【Example】
Embodiments of an axial cooling fan for electronic equipment according to the present invention will be described below with reference to the drawings.
[0009]
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 disposed therein, and an outer rotor type electric motor 10 that supports and rotates a central portion thereof. Consists of.
[0010]
The housing 2 has a cylindrical body portion 4 having a cylindrical inner peripheral surface 4a formed therein, and a ring-shaped intake side end plate 6 in which a circular intake hole 5 is formed at one end of the body portion 4. Is fixed. Further, a disc-shaped air discharge side end plate 7 is formed at the other end of the body portion 4, and a fan-shaped air discharge hole 8 is partitioned at the outer peripheral portion by a support web 9 extending in the radial direction and spaced in the circumferential direction. Is arranged. As shown in FIGS. 2 to 4, both end plates 6 and 7 are both formed in a square shape, and mounting holes 6b and 7b are formed in corners (projections) 6a and 7a projecting radially outward from the body portion 4, respectively. Has been. Therefore, the cooling fan of this embodiment is a rectangular type.
[0011]
An outer rotor type electric motor 10 is provided at the center of the housing 2, and a stator 22 thereof is fixed to the center of the inner surface of the air discharge side end plate 7, and the rotor 11 is provided around the stator 22.
[0012]
The impeller 3 also has a disk-shaped air discharge side end plate 12, and a boss portion 13 that extends to the intake side and is fitted and fixed to the rotor 11 of the electric motor 10 is formed at the center portion of the impeller 3. A plurality of blades 14 are projected from the outer peripheral portion toward the intake side. 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. The end plate 20 has an inner diameter that 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 very close to the inner surface of the intake side end plate 6 of the housing 2, and air flow between both surfaces is suppressed as much as possible. Further, as shown in the lower side of FIG. 1, a circular rim 21 may be provided in place of the end plate 20 in order to reinforce the outer peripheral portion of the intake side end portion of the blade 14.
[0013]
As shown in FIG. 4, these blades 14 are arranged at equal intervals in the circumferential direction of the end plate 12, and the outer end and the inner end thereof are a cylindrical outer peripheral surface 15 and a cylindrical inner periphery, respectively. The 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 in the rotation direction R of the impeller 3 from the outer peripheral surface 15 toward the inner peripheral surface 16, and at the same time, desirably, a spiral spiral curved in a convex shape in the rotation direction R (for example, one of the ellipses). Part). As the shape of the blade 14, an appropriate shape is selected according to the size of the impeller 14, the size / inclination angle / number of blades, the desired wind pressure, the desired air volume, etc. As shown below 4, each blade 14 may be formed of a flat plate.
[0014]
A ring-shaped airflow axial flow 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 that is coaxial with the outer peripheral surface 15, and this is the air discharge side end plate 7. The air discharge holes 8 are communicated with each other. Further, 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 airflow axial flow chamber 19. ing.
[0015]
FIG. 5 shows the air pressure-air flow characteristic curves 17 and 18 of the axial flow cooling fan of the present application equipped with a centrifugal blower type impeller and the axial flow cooling fan equipped with a conventional propeller type impeller, respectively as a solid line and a dotted line. Show. 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, the cooling fan of the present invention generates a larger wind pressure than the conventional cooling fan for the same air volume on the left side from the intersection A of both curves, and the cooling fan of the present invention at the same operating point B. It can be seen that this produces a larger air volume than the conventional cooling fan (about twice in the example of FIG. 5). Therefore, it is clear that the present invention can cool an electronic device with higher efficiency than before.
[0016]
Next, the operation of the cooling fan 1 of this embodiment will be described.
[0017]
When the cooling fan 1 is used to send air into an electronic device having an electronic element having an integrated circuit, a bolt is passed through the mounting hole 6b, and the air discharge side end plate 7 is set to the inside, and the intake side end The corner 6a of the plate 6 is attached around the attachment hole of the electric device. Further, when the cooling fan 1 sucks air from the electronic device and discharges it outside the device, a bolt is passed through the mounting hole 7b, and the corner of the air discharge side end plate 7 is set with the intake side end plate 6 inside. The part 7a is attached around the attachment hole of the electric device. In either case, the cooling fan 1 is embedded in the electronic device and protrudes out of the device so as not to get in the way.
[0018]
When the motor 10 is actuated to rotate the impeller 3 in the direction indicated by R in FIG. 4, air is taken in from the intake hole 5 and is increased to a high pressure according to the characteristics indicated by the solid line in FIG. Send it out in the direction. The air sent out in this way is sent to the axial direction of the housing 2 and to the air discharge side in the air flow axial flow chamber 19 around the impeller 3 and discharged through the air discharge hole 8.
[0019]
When the cooling fan 1 is used for intake, a high negative pressure is generated in the device, and air is passed through a space between the electronic elements, that is, through the air passage with a large air volume, so that these electronic elements are sufficiently cooled. In addition, when the cooling fan 1 sends air into the electronic device, a large positive wind pressure is generated in the device, and this also applies the electronic device in the device as in the case of applying a negative pressure. It can be cooled down.
[0020]
FIG. 6 shows a second embodiment of the cooling fan of the present invention. The cooling fan 51 has the same structure and operation as the cooling fan of the first embodiment except for the attaching means. In the first embodiment, the attachment means is formed by forming attachment holes in the corners of the square end plates of the housing 2, but in the second embodiment, the intake side end of the outer peripheral surface of the cylindrical housing 52 is provided. A plurality of substantially semicircular projections 73 and 74 are formed on the air discharge side end portion, each being spaced apart in the circumferential direction of the housing 52 (in the case of this embodiment, four at equal intervals). The mounting holes 75 and 76 are formed in these. The outer rotor motor 60 and the blade 64 are the same as the outer rotor motor 10 and the blade 14 of the first embodiment, respectively.
[0021]
In the first embodiment, both end plates of the housing are square, but may be other regular polygons or general polygons. Furthermore, in the second embodiment, the protrusions 73 and 74 are semicircular, but other shapes may be used depending on the purpose of attachment. In addition, when the cooling fan is dedicated to intake air or dedicated to air feeding, 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]
【The invention's effect】
As described above, the present invention increases the pressure by compressing the gas radiated in the centrifugal direction by the rotation of the plurality of blades between the inner peripheral surface of the housing and the plurality of blades. Since it is configured to discharge the gas having a flow parallel to the rotation axis of the rotor given to the gas projection hole, for example, it is possible to effectively cool an electronic device in which an electronic element having an integrated circuit with a high degree of integration is mounted. There is an effect.
[Brief description of the drawings]
FIG. 1 is a longitudinal 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 as viewed from the intake side.
3 is a view of the cooling fan of FIG. 1 as viewed from the air discharge side.
4 is a cross-sectional view taken along line 5-5 in FIG.
FIG. 5 is a wind 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 flow cooling fan for electronic equipment according to a second embodiment of the present invention as viewed from the intake side.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cooling fan 2 of 1st Example Housing 3 Impeller 4 trunk | drum 4a Inner peripheral surface 5 Intake hole 6 Intake end plate 6a corner (protrusion) of housing
6b Mounting hole 6c Rim part 7 Air discharge side end plate 7a Corner part (projection) of housing
7b Mounting hole 8 Air discharge hole 10 Outer rotor electric motor 11 Rotor 12 Impeller air discharge side end plate 14 Blade 15 Outer peripheral surface 16 Inner peripheral surface 17 Wind pressure-air volume characteristic 18 of cooling fan of the present invention 18 Wind pressure of conventional cooling fan Airflow characteristics 19 Air flow axis sulfidation chamber 20 Impeller intake side end plate 21 Rim 22 Stator 51 Cooling fan 52 of second embodiment Housing 60 Outer rotor motor 64 Blade 73 Projection 74 Projection 75 Installation hole 76 Installation hole R Rotation of impeller Direction B Working point

Claims (6)

An electric motor having a rotor that rotates about an axis;
An intake side end plate having a plate shape and having an intake hole penetrating in the thickness direction of the plate shape at the center thereof ;
A discharge-side end plate having a plate shape, in which a gas discharge hole penetrating in the thickness direction of the plate shape is formed and the electric motor is attached so that the axis is perpendicular to the plate shape;
A rotating plate that has a disk shape, the disk-shaped central portion is attached to the rotor, and a predetermined gap is provided between the discharge-side end plates and the disk-shaped one surface is opposed to the rotating plate. When,
A plurality of blades standing on the other disk-shaped surface of the rotating plate, circularly moving with the rotation of the rotating plate, and radiating gas given from the suction holes in the centrifugal direction;
It has a cylindrical shape and supports the peripheral portion of the discharge side end plate at one end of the cylindrical shape, and the intake side end plate and the discharge side end plate are parallel to the peripheral portion of the intake side end plate at the other end of the cylindrical shape. supporting so that, the inside of the tubular motor, said radiation between the plurality of blades and the cylindrical inner peripheral surface and the intake side end plate accommodates a rotating plate and a plurality of blades increasing the pressure of the gas that is, the pressure of increased gas through the gap provided in the gas discharge holes, the gas was increased the pressure from the gas discharge holes in the gas with a flow parallel to the axis A housing for delivery;
An axial fan characterized by comprising: The plurality of blades are arranged at a predetermined interval in the circumferential direction of the rotating plate, and on the suction side end plate side of the plurality of blades, the outer ends of the plurality of blades whose outer diameters circularly move 2. A ring-shaped intake side end plate having an inner diameter equal to or greater than a diameter of an inner peripheral surface defined by inner ends of the plurality of blades is formed. The described axial flow fan. The plurality of blades are arranged at a predetermined interval in the circumferential direction of the rotating 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. 3. The axial fan according to claim 1, wherein the axial fan is provided. 4. The axial fan according to claim 1, wherein each blade is curved in a convex shape in the direction of the circular motion. 5. 4. The axial fan according to claim 1, wherein each of the blades is configured by a flat plate. 5. The axial fan according to any one of claims 1 to 5, wherein a projection 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.

Images