JP3030085U - Impeller for cooling fan - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an impeller for a cooling fan, which does not require assembling work of a rotating shaft or balance adjustment and is easy to manufacture a mold. SOLUTION: A disk portion 11 in which a ring-shaped permanent magnet used on the rotor side of a motor is arranged, and the disk portion 11
A plurality of blades 12 that are arranged around the
A rotary shaft 13 located at the center of rotation of the disk portion 11 is integrally formed by injection molding to form a cooling fan impeller.
Was configured. Further, a rim 14 is integrally formed on the disc portion 11, and the rim 14 has a function of positioning the permanent magnet when the permanent magnet is arranged on the disc portion 11, and the free end is deformed to form the permanent magnet. It also has the function of fixing to.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to an impeller for a cooling fan, and more particularly to an impeller for a cooling fan suitable for application to a small cooler for electronic parts.

[0002]

[Prior art]

 Conventionally, a radiator is attached to the electronic components that generate heat during operation, or forced air cooling is performed by a fan. For example, in computers, the central processing unit is the main heat source, and a cooling fan is often used to cool it.

An axial fan is used as such a cooling fan. In an axial fan, an impeller is usually formed by pressing a metal, and a metal rotating shaft is separately attached to the impeller. Further, as another example, there is one in which the impeller is made of a plastic molded product made of, for example, ABS resin. In each case, the impeller also functions as a rotor of a motor for driving the impeller, and therefore, the impeller has, for example, a ring shape that cooperates with a coil of a stator provided in the fan housing. The permanent magnet of is fixed. This permanent magnet is usually attached by an adhesive to the side of the impeller facing the stator coil.

[0004]

[Problems to be solved by the device]

 However, conventional impellers for axial-flow fans require the work of inserting a metal rotary shaft and bonding a ring-shaped permanent magnet later, and moreover, the adhesive coating thickness There is a problem that the balance adjustment is necessary when the rotational balance is lost due to unevenness.

Further, when the impeller is molded by plastic, the blades are inclined with respect to the central axis of the rotating shaft, and adjacent blades overlap in the axial direction in consideration of the work at the time of mold release. There was a problem that it could not do anything and that it was difficult to make molds.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an impeller for a cooling fan, which does not require the work of assembling the rotating shaft and the balance adjustment, and can easily manufacture a mold. To aim.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, according to the present invention, a disk part having a region where ring-shaped permanent magnets are concentrically arranged and fixed to each other, and a centrifugal fan provided on the outer periphery of each disk part are provided. There is provided an impeller for a cooling fan, characterized in that a plurality of constituent blades and a rotating shaft located at the center of rotation of the disk portion are integrally molded.

[0008]

[Embodiment of device]

 Hereinafter, an embodiment of the present invention will be described as an example in which it is applied to a small-sized cooler for electronic parts.

FIG. 1 is a perspective view showing a central longitudinal section of a cooling fan impeller according to the present invention, and FIG. 2 is a plan view of a cooling fan impeller according to the present invention. In these drawings, a cooling fan impeller 10 includes a disk portion 11, a plurality of blades 12 provided at equal intervals on an outer peripheral edge portion of the disk portion 11, and a rotation located at a rotation center of the disk portion 11. And the shaft 13. The rotary shaft 13 is provided only on one surface of the disk portion 11. The blade 12 has an axial length longer than the thickness of the disc portion 11, and one axial end surface 12a thereof is flush with the disc portion 11 on the side where the rotation shaft 13 is not provided, and the rotation shaft 13 is provided. The other axial end surface 12b on the closed side extends from the surface of the disk portion 11. A rim 14 is provided concentrically on the surface of the disk portion 11 on the side where the rotary shaft 13 is provided. The rim 14 has a function of positioning the permanent magnet when the ring-shaped permanent magnet is fixed to the disk portion 11, and a function of fixing the positioned permanent magnet to the disk portion 11 by a method described later. Have Therefore, the length of the rim 14 in the axial direction is set longer than the thickness of the ring-shaped permanent magnet.

The disk portion 11, the blades 12, the rotary shaft 13, and the rim 14 that form the cooling fan impeller 10 are integrally formed by injection molding. The raw material is injected into the mold through an injection port provided at the center of the end surface of the rotary shaft 13 on the side of the disk portion 11. Therefore, the press-fitted raw material spreads in the radial direction from the central portion forming the rotary shaft 13 to the space portion where the blades 12 are formed. As the raw material, polypropylene is preferably used.

Further, the disk portion 11 is provided with a plurality of holes 15 having a relatively small diameter. These holes 15 are arranged at equal intervals on a concentric circle centered on the center of rotation of the rotary shaft 13. Further, these holes 15 depressurize the space surrounded by the disk portion 11 and the blades 12 when the cooling fan impeller 10 is rotationally driven, so that the air for creating a flow of air to this space is generated. It has the function of a passage and the function of narrowing the flow path of the raw material that flows in the radial direction during injection molding and uniformly supplying the raw material to the space where the blades 12 are formed over the entire circumference. Therefore, with respect to the function of the air passage, the inside of each hole 15 is tapered so as to spread along the air flow direction. Also, for the function of the diaphragm, in order not to leave a large gap between the outer peripheries of the adjacent holes 15, a large number of small diameter holes are provided instead of a small number of large diameter holes. .

Next, an example will be shown in which a ring-shaped permanent magnet is fixed to the cooling fan impeller 10 to form a motor rotor. FIG. 3 is a diagram showing an example of installation of a rim on a disc portion.

In this figure, any of the installation examples of the rim is a partial view of the disk portion as seen from the side where the rotary shaft 13 is present, and (A) shows a ring-shaped permanent magnet 16 with its inner and outer circumferences. An example of the case where two rims 14a and 14b are provided on the disk part 11 for positioning from the side is shown, and (B) shows an example of the case where the rim 14a is provided on the disk part 11 on the inner peripheral side of the permanent magnet 16. 9C shows an example in which the disk portion 11 is provided with the rim 14 b on the outer peripheral side of the permanent magnet 16. Here, when the ring-shaped permanent magnet 16 is fixed to the cooling fan impeller 10, these rims 14a and 14b provided in the disk portion 11 serve to position the permanent magnet 16. .

FIG. 4 is a view showing another example of installation of the rim on the disc portion. First, the example of the rim shown in FIG. 3A is a type in which the rim is installed on the inner peripheral side of the permanent magnet 16 shown in FIG. 3B, but it is not particularly limited to this type. Here, the rim 14c does not have a cylindrical shape whose entire circumference is continuous, but shows an example in which at least the free end is discontinuous in the circumferential direction and is formed in a cylindrical shape as a whole. That is, the rim 14c has a cylindrical member 14ca whose entire circumference is continuous on the side of the disk portion 11 and the cylindrical member 14ca as shown in FIG. It is composed of a plurality of rod-shaped members 14cb protruding from the free end. Further, as another configuration example, a plurality of rod-shaped members protruding from the disc portion 11 may be arranged in a circle to form a circumferentially discontinuous rim.

Next, an example of fixing a ring-shaped permanent magnet to the cooling fan impeller 10 will be shown. FIG. 5 is a diagram showing an example of fixing the permanent magnets. This figure is a partial cross-sectional view of the disk portion as seen with the side with the rotating shaft 13 facing upward. (A) to (C) are rims shown in (A) to (C) of FIG. 7 shows an example of fixing the ring-shaped permanent magnet 16 to the cooling fan impeller 10 corresponding to the installation type of No. Here, each of the rim 14a and the rim 14b is formed so that the length in the axial direction is longer than the thickness of the permanent magnet 16.

First, as shown in (A), in the type in which the rims 14a and 14b are provided on the inner and outer circumferences of the permanent magnet 16, the inner peripheral rim 14a has its free end portion radially outward. The rim 14b on the outer circumference side is bent so that its free end portion is bent inward in the radial direction to fix the permanent magnet 16 from both the inner circumference and the outer circumference thereof. Further, in the types shown in (B) and (C) where the rim 14a is on the inner circumference of the permanent magnet 16 and the rim 14b is on the outer circumference, the free end portion of the rim 14a on the inner circumference side is The permanent magnet 16 is fixed to the disk portion 11 of the cooling fan impeller 10 by being bent radially outward and the free end portion of the rim 14b on the outer peripheral side being bent radially inward.

Bending at the free end of the inner rim 14 a or the outer rim 14 b applies heat and pressure in the direction of the permanent magnet 16 to the free end of the rim 14 a to the permanent magnet 16. There are a method of heating and deforming the rim by fusing or using an ultrasonic heater as a heating means, and a method of physical deformation in which the free end of the rim is caulked to be joined to the permanent magnet 16. When the rim has a cylindrical shape as shown in FIG. 3, the permanent magnets 16 are fixed to the cooling fan impeller 10 over the entire circumference of the rim, and as shown in FIG. In the case of such a rim, the permanent magnet 16 is fixed to the cooling fan impeller 10 by being performed over the entire circumference of the rim or by deforming a part of the rim by the above method. I am trying.

Next, an example in which the cooling fan impeller 10 is incorporated in a small-sized cooler for electronic components will be described. FIG. 6 is a view showing an example of use of the impeller for a cooling fan of the present invention.

In this figure, the cooling fan impeller 10 of the present invention is housed in a radiator body 21, and a lid 22 is placed on the radiator body 21 to form a thin compact cooler. The heat sink main body 21 is provided with cooling fins 23 standing upright on four sides, and a stator portion (not shown) of a motor for a cooling fan is installed in the central portion. The cooling fan impeller 10 provided thereon functions as the rotor of the motor for the cooling fan. Therefore, if the motor for the cooling fan is a DC brushless motor, a Hall element for detecting the rotational position and a stator are provided in the stator portion at a position facing the permanent magnet 16 fixed to the impeller 10 for the cooling fan. The coil is installed and the control circuit is installed in another place. Further, as the bearing of the impeller 10 for the cooling fan, it is preferable to use an angular bearing capable of withstanding axial and radial loads.

The lid 22 is provided with a plurality of holes 24 having a relatively large opening area, and these holes 24 form an air suction port. Here, when the cooling fan impeller 10 rotates, the air on the outer periphery of the cooling fan impeller 10 is pushed outward in the radial direction by the centrifugal force generated by the blades 12 of the cooling fan impeller 10. As a result, the air 25 is sucked through the hole 24 provided in the lid 22. Then, the air pressurized by the blades 12 passes through the four fins 23 on all sides and is discharged from the radiator main body 21. At this time, when heat is accumulated in the radiator body 21, heat is exchanged with the air passing through the fins 23, and the radiator body 21 is cooled. Further, since the inner space of the cooling fan impeller 10 is decompressed, a part of the air supplied from the hole 24 of the lid 22 flows in through the hole 15 of the cooling fan impeller 10. .

[0021]

[Effect of device]

 As described above, in the present invention, the number of parts to be assembled can be reduced by using the cooling fan impeller integrally formed including the rotary shaft. In addition, by using a centrifugal fan, the blades can be shaped parallel to the axial direction, making it easier to make molds and producing less wind noise than an axial fan, so the operating noise is quiet. . The air volume is comparable to that of an axial fan, and the air volume can be further increased by making the blades thinner and more. In addition, the ring-shaped permanent magnet is fixed to the cooling fan impeller by deforming the integrally molded rim, so there is no need for gluing or drying, and there is no need to adjust the rotational balance. become.

[Brief description of drawings]

FIG. 1 is a perspective view showing a central longitudinal section of a cooling fan impeller according to the present invention.

FIG. 2 is a plan view of an impeller for a cooling fan according to the present invention.

FIG. 3 is a diagram showing an example of installation of a rim on a disc portion.

FIG. 4 is a diagram showing another example of installation of rims on a disc portion.

FIG. 5 is a diagram showing an example of fixing a permanent magnet.

FIG. 6 is a view showing an example of use of the cooling fan impeller of the present invention.

[Explanation of symbols]

 10 Cooling Fan Impeller 11 Disk Part 12 Blades 13 Rotating Shaft 14 Rim 15 Hole 16 Permanent Magnet 21 Radiator Main Body 22 Lid 23 Fin 24 Hole 25 Air

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H01F 7/02 G06F 1/00 360C

Claims (6)

[Scope of utility model registration request] 1. A disk part having a region where ring-shaped permanent magnets are concentrically arranged and fixed, a plurality of blades provided on the outer periphery of the disk part to form a centrifugal fan, and the disk part. An impeller for a cooling fan, characterized by being integrally formed with a rotation shaft located at the center of rotation of the. 2. The disk portions are arranged on the concentric circles at equal intervals, and each of the disk portions is provided with a plurality of holes tapered so as to spread in the air flow direction. The impeller for a cooling fan according to claim 1. 3. The disk portion is provided with a rim for positioning the ring-shaped permanent magnet on the inner circumference or the outer circumference or the inner circumference and the outer circumference on a concentric circle thereof. Impeller for cooling fan. 4. The fixation of the permanent magnet to the disk portion is
4. The heat treatment or the physical deformation of the inner circumference or outer circumference of the permanent magnet or the entire circumference or a part of the rim positioned on the inner circumference and the outer circumference of the permanent magnet so as to lock the permanent magnet. The cooling fan impeller described. 5. The impeller for a cooling fan according to claim 1, wherein the disk portion, the plurality of blades, and the rotary shaft are formed by injection molding using polypropylene as a raw material. 6. A disk portion, which is concentrically fixed to a ring-shaped permanent magnet, and constitutes a rotor of a motor, a plurality of blades, which are provided on the outer circumference of the disk portion and constitute a centrifugal fan, and the disk portion. A cooler characterized by comprising an impeller integrally formed by injection molding with a rotation shaft located at the center of rotation of.