JPH048143A - Fan - Google Patents

Abstract

PURPOSE:To suppress the occurrence of turbulence by providing a stator inside the barrel of a housing, and providing a rotor magnet, which corresponds to the stator, around an impeller, and holding the periphery of the impeller freely in rotation through a bearing with the barrel of the housing. CONSTITUTION:A circumferential groove 8 is provided at the inside periphery of the barrel 3 of a housing 1, and a stator 4 is provided in this circumferential groove 8. An impeller 2 forms a rotor magnet 6, by so sticking a magnetized annular magnet as to correspond to the stator 4. The periphery of the impeller 2 is held in a rotation-free manner through a bearing 16 with the barrel 3 of the housing 1.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a fan.

[Problems to be solved by conventional technology and invention] Copying machine,
As shown in FIG. 5, a fan used in office equipment such as a word processor has an impeller C consisting of a bowl-shaped base a and a plurality of blades b protruding from its outer peripheral surface.
A rotor magnet d attached to the inner peripheral surface of the bowl-shaped base a of the impeller C, a housing f having a body part e surrounding the outer peripheral side of the blades b, and a cylindrical part g of the housing f. The stator h is fitted externally. That is, the bouncing r consists of the above-mentioned cylindrical part g which is externally fitted onto the rotating shaft 0 via the bearing i, the bowl-shaped part j which is connected to the cylindrical part g and faces the above-mentioned base a, and the bowl-shaped part j. and a support frame k... which connects the body part e and the body part e.

Therefore, since the support frame k is provided at the air passage opening l formed as shown in FIG. Therefore, the length of each blade in the axial direction cannot be made very large, and the area of each blade cannot be made very large.

Therefore, the present invention can suppress the occurrence of turbulent flow and reduce noise, and when compared with a conventional fan with the same external dimensions, the area of each blade part can be made larger than that of a conventional fan. The purpose is to provide fans who can.

[Means to solve the problem]

In order to achieve the above object, the fan according to the present invention has the following features:
A stator part is provided inside the body of the housing, and
A rotor magnet portion corresponding to the stator portion is provided on the outer circumferential portion of the impeller, and the outer circumferential portion of the impeller is rotatably held in the body portion of the housing via a bearing.

[For production]

Since the outer periphery of the impeller is held in the body of the housing, there is no need to hold the impeller in the housing at its shaft. There is no need to provide a cylindrical portion to hold the stator in the center of the body, and furthermore, there is no need to provide a support frame at the air passage opening to hold the cylindrical portion.

Further, since no support frame is provided, the axial length of the blade portion can be increased accordingly. Therefore, the area of each blade becomes large.

〔Example〕

Hereinafter, the present invention will be explained in detail based on drawings showing examples.

1 and 2 show a fan according to the invention, which comprises a housing 1, an impeller 2 installed inside the housing 1, and an inner side of the body 3 of the housing 1. The rotor magnet throat section 6 includes a stator section 4 provided on the outer peripheral section 5 of the impeller 2.

Thus, the housing 1 includes the short cylindrical body portion 3;
Mounting walls 7 each having a substantially triangular shape in plan view are provided at both ends of the body 3 to protrude outward at a pitch of 90°,
The overall external shape is approximately square in plan view. A concave circumferential groove 8 is provided on the inner circumferential surface of the body portion 3, and the concave circumferential groove 8
A stator section 4 is provided at the. In addition, the stator section 4
is a coil 11 wound around an annular stator core 9 and six inwardly protruding teeth 10 of the stator core 9.
The stator core 9 is attached to the concave circumferential groove 8 by means such as adhesive or press fitting.

The impeller 2 also includes a shaft portion 12, five blades 13 protruding from the outer circumferential surface of the shaft portion 12, and five blades 13.
A cylindrical part 14 that connects the outer edges of the cylindrical part 14, and N and S poles are arranged on the outer circumferential surface 15 of the cylindrical part 14 alternately along the circumferential direction.
A rotor magnet part 6 is formed by fixing an annular magnet nod whose poles are magnetized so as to correspond to the stator part 4. In this case, the impeller 2 is made of magnetizable plastic, the cylindrical part 14 is provided with a protrusion corresponding to the stator part 4, and the outer peripheral surface of the protrusion is alternately provided with N poles and N poles along the circumferential direction. It is also possible to form the rotor magnet portion 6 by magnetizing the S pole.

Further, the inner ring 1 of the bearing 16 is provided on the outer peripheral surface 15 of the cylindrical portion 14.
6a is fixed to the inner peripheral surface protrusion 1 of the body 3 of the housing 1.
An outer ring 16b of the bearing 16 is fixed to the bearing 7.

Therefore, the outer circumferential portion 5 of the impeller 2, via the bearing 16,
It is rotatably held by the body 3 of the housing 1, and in this case, there is no need to provide a support frame at the air passage opening 1818. In other words, it is not necessary to make the shaft portion 12 of the impeller 2 large in diameter, and the axial length of each blade 13, as shown in FIG. The area of each section 113 can be increased.

Note that 19 is a mounting hole for mounting this housing 1 to other parts.

Next, FIGS. 3 and 4 show another embodiment, in which case,
A substrate 22 is attached to the bottom surface 21 of the concave circumferential groove 8 of the housing 1, and a planar coil 23 is disposed on the substrate 22.
A stator section 4 is formed.

Further, the impeller 2 includes a shaft portion 12, blades 13 protruding from the outer peripheral surface of the shaft portion 12, and a cylindrical portion 14 connecting the outer peripheral edges of the blades 13. , a circumferential protrusion 24 is provided protrudingly at the center of the outer peripheral surface of the cylindrical portion 14,
A flat magnet is attached to the protruding portion 24 via a rotor yoke 25 to form a rotor magnet portion 6.

Also in this case, the inner ring 16a of the bearing 16 is fixed to the outer peripheral surface 15 of the cylindrical portion 14, and the outer ring 16b of the cough bearing 16 is fixed to the inner peripheral surface protrusion 17 of the body 3 of the housing l. .

Therefore, in this embodiment as well, there is no need to provide a support frame at the air passage opening 1818, and each blade 13...
The area of can be increased.

Note that the present invention is not limited to the above embodiments, and the design may be changed without departing from the gist of the present invention. For example, the number of blades 13 of the impeller 2 may be increased or decreased, and the number of magnetic poles of the rotor magnet portion 6 may be changed. You can freely set it as

[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.

(2) It is possible to omit the support frame for the wind passage opening, which was conventionally provided, making it easier for the wind to pass through, and suppressing the occurrence of turbulence, resulting in extremely low noise.

■ Since the support frame can be omitted, the axial dimension of the blades 13 of the impeller 2 can be increased accordingly, and the area of each blade 13 can be increased accordingly. By doing so, you can make a big difference.

(2) Since the rotor magnet portion 6 is provided on the outer periphery 5 of the impeller 2, the diameter of the rotor magnet portion 6 can be set sufficiently large, making it possible to achieve high torque and high efficiency.

(2) Since the impeller 2 is held at its outer periphery 5 via the bearing 16, it is held securely, the rotational precision of the small fan is high, and the life of the bearing 16 is extended, resulting in excellent durability.

(2) Since the housing 1 has a simple shape, it is easy to assemble and has the advantage of not increasing costs.

[Brief explanation of the drawing]

FIG. 1 is a sectional front view showing an embodiment of the fan of the present invention;
2 is a cross-sectional view taken along the line ■--■ in FIG. 1, FIG. 3 is a plan view showing another embodiment of the present invention, and FIG. 4 is a cross-sectional front view of the fan shown in FIG. 3. FIG. 5 is an enlarged sectional view of the main part of the conventional example, and FIG. 6 is a simplified plan view of the housing. DESCRIPTION OF SYMBOLS 1... Housing, 2... Impeller, 3... Body part, 4... Stator part, 5... Outer peripheral part, 6... Rotor magnet part, 16... Bearing. Figure 1 Figure 3 Figure 4 Figure 6

Claims (1)

[Claims] 1. A stator part 4 is provided inside the body part 3 of the housing 1, and a rotor magnet part 6 corresponding to the stator part 4 is provided on the outer peripheral part 5 of the impeller 2, and the outer peripheral part 5 of the impeller 2 is A fan characterized in that it is rotatably held in the body part 3 of the housing 1 via a bearing 16.