JP2006177309A - Heat radiation structure of fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat radiation structure of a fan capable of cooling the whole motor stored in a boss by flowing-in of a part of driven fluid into the boss when the fan rotates, prolonging service life of the fan, and reducing rattling of the fan by fluid guided into the boss. <P>SOLUTION: This heat radiation structure of the fan is provided with at least an impeller unit, a motor unit, and a fan base. The impeller unit is joined with the fan base, and the motor unit is fitted into the fan base. At least one pillow part is provided on the fan base, and the pillow part forms a ventilation port and a flow passage on the opposite side to the boss provided in the impeller unit to guide a part of fluid driven by rotation of the fan into the boss, radiate heat of the whole motor stored in the boss, and prolong service life of the whole fan. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat dissipation structure for a fan, and in particular, a support base included in a fan is designed to have a size and a shape corresponding to a boss, and a fan impeller rotates to move a fluid, and a part of the fluid is cooled. And a part of the motor is guided into the boss, so that the heat dissipation effect of the entire motor accommodated in the boss is produced.

As shown in FIG. 1, in the known fan assembly structure, the fan includes a fan case 41 and a boss 42, a support base 411 is provided in the fan case 41, and a hollow shaft cylinder 412 is provided in the support base 411. A bearing 413 is installed in the hollow shaft cylinder 412, and a motor stator 43 is installed outside the hollow shaft cylinder 412, and the motor stator 43 is positioned on the support base 411. The boss 42 is a cover that is closed on one side and open on one side. The boss 42 accommodates a cap 44 that is closed on one side and opened on one side. An annular motor rotor 45 is provided on the inner periphery of the cap 44. The boss 42 is provided by forming a plurality of radially arranged blades 421, having a rotating shaft 46 with one end connected to the boss 42 and the cap 44, and another end penetratingly inserted into the bearing 413. The boss 42 and the cap 44 are pivotally mounted on the support base 411. When the motor stator 43 and the motor rotor 45 are excited, the boss 42 and the cap 44 are rotated by the phase change, and at the same time, the blade 421 is rotated to move the fluid to remove heat from the object to be cooled. Do.

The action of the above-mentioned known fan is to pass the fluid through the object to be cooled (not shown in the figure). However, since the operation between the motor stator 43 and the motor rotor 45 also generates heat and the entire cap 44 is covered with the boss 42, the heat exchange rate with the outside world becomes low, and a large amount of heat energy is generated. Is trapped in the cap 44, which not only shortens the life of the fan body but also increases the heat of the entire system. Therefore, it is necessary to improve the drawbacks of the known technology.

In order to solve the above-described drawbacks of the known technology, the main object of the present invention is to provide a heat dissipation structure for a fan. The fan support base is designed to have dimensions and structure corresponding to the boss, and a part of the fluid driven by the rotation of the fan is guided into the boss so that the entire motor accommodated in the boss can dissipate heat. I do.
Another object of the present invention is to reduce fan rattling by using an air flow created by a fluid guided in a boss.

The heat dissipation structure of the fan includes at least an impeller unit, a motor unit, and a fan base. The impeller unit is joined to the fan base, the motor unit is fitted into the fan base, and at least one pillow part is provided on the fan base. The pillow part forms a vent and a flow path on the opposite side of the boss provided in the impeller unit. As a result, a part of the fluid driven by the rotation of the fan is guided into the boss, the entire motor accommodated in the boss is radiated, and the service life of the entire fan can be extended.

When the fan rotates, a part of the fluid to be driven flows into the boss, the entire motor accommodated in the boss is cooled, and the service life of the fan can be extended. Further, the play of the fan is reduced by the fluid guided into the boss.

As shown in FIG. 2, the preferred embodiment of the fan heat dissipation structure of the present invention includes an impeller unit 10, a motor unit 20, and a fan base 30. The impeller unit 10 is composed of an impeller boss 11, a rotating shaft 12, a motor case 13, and a magnet strip 15. The rotating shaft 12 is provided on a shaft base 111 formed at the center of the bottom of the impeller boss 11, and the motor case 13 is disposed on the inner edge of the impeller boss 11. The magnet strip 15 is installed on the inner edge of the motor case 13.

  The motor unit 20 is fitted into the fan base 30, and the motor unit 20 includes an insulating portion 21, a silicon steel piece 22, a circuit board 23, and a coil 24. The silicon steel piece 22 is provided outside the insulating portion 21, The insulating part 21 is surrounded by the silicon steel piece 22. A hollow shaft housing 31 is provided at the center of the fan base 30, the circuit board 23 is disposed between the bottom of the insulating portion 21 and the shaft housing 31, and the rotary shaft 12 is disposed in a housing space formed by the shaft housing 31. A bearing 32 is provided between the outside of the rotating shaft 12 and the shaft housing 31 so that the rotating shaft 12 is supported by the bearing 32 and rotates, and an oil ring R is provided between the bearing 32 and the impeller boss 11.

  The shaft housing 31 is provided with a protruding portion 311 and a stopper 312, one end of the rotating shaft 12 not connected to the impeller boss 11 of the impeller unit 10 is formed in an arc shape, the retainer 14 is tightened, and the protruding portion 311 is attached to the retainer 14. By forming an interference action on the rotating shaft 12, the rotating shaft 12 is prevented from being detached from the shaft housing 31. The fan base 30 has at least one pillow part 33 (one pillow part shown in FIGS. 2 and 4, a plurality of pillow parts shown in FIGS. 3, 5, and 6, and FIG. 7 shows a pillow around the entire fan base 30. The pillow portion 33 of the fan base 30 faces the impeller boss 11 to form a vent 34 and a flow path so that a part of the fluid driven by the rotation of the fan is guided into the boss. In addition, heat can be dissipated to the entire motor housed in the boss, thereby extending the service life of the entire fan and reducing the backlash of the fan by the fluid guided into the impeller boss 11.

1 is a schematic diagram of a known fan heat dissipation structure and example. 1 is a schematic cross-sectional view of a preferred embodiment of the present invention. 2 is a schematic cross-sectional view of another preferred embodiment of the present invention. FIG. 3 is a schematic overhead view of FIG. 2. FIG. 4 is a schematic overhead view of FIG. 3. It is another bird's-eye view schematic of FIG. FIG. 4 is still another overhead view of FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Impeller unit 11 Impeller boss 111 Shaft base 12 Rotating shaft 13 Motor case 14 Retainer 15 Magnet strip 20 Motor unit 21 Insulating part 22 Silicon steel piece 23 Circuit board 24 Coil 30 Fan base 31 Shaft housing 311 Protruding part 312 Stopper 32 Bearing 33 Pillow part 34 Ventilation hole R Oil ring 41 Fan case 411 Support base 412 Hollow shaft cylinder 413 Bearing 42 Boss 421 Blade 43 Motor stator 44 Cap 45 Motor rotor 46 Rotating shaft

Claims (1)

It is a heat dissipation structure for a fan, and it has at least an impeller unit, a motor unit, and a fan base. The impeller unit is joined to the fan base, and the motor unit is fitted into the fan base.
The fan base is provided with at least one pillow part, and the pillow part forms a vent and a flow path on the opposite side of the boss provided in the impeller unit, and a part of the fluid driven by the rotation of the fan inside the boss. A fan heat dissipation structure characterized by extending the service life of the entire fan by guiding heat to the entire motor housed in the boss.

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