JP3056876U - Fan heat dissipation structure - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To provide a low-cost fan heat radiation structure having a good heat radiation effect. SOLUTION: This is a fan radiating structure for radiating heat generated during operation of a fan. The fan radiating structure has a hollow columnar hub portion 2 inserted into a through hole at the center of a motor, and a base 32 of a plastic fan frame. On the other hand, in the bearing sleeve 1 having the bottom 3 covering the surface opposite to the mounting surface of the motor, a plurality of radiating fins 4 are provided on the outer periphery of the bottom 3 of the bearing sleeve 1, and a portion close to the bottom 3 of the hub 2 is substantially hollow. It has a polygonal column shape, and the other parts are roughly hollow cylindrical shapes.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a heat dissipation structure, and particularly to a heat dissipation structure for a fan.

[0002]

[Prior art]

 The radiation structure of commercially available fans is mainly divided into two types. (1) One uses a plastic fan frame with a copper sleeve on the inner edge. (2) The other uses a fan frame made of metal such as aluminum. It is.

[0003]

[Problems to be solved by the invention]

 Plastic fan frames with a copper sleeve on the inner edge are inexpensive, lightweight, and insulative (ie, do not short circuit the substrate). However, since plastic has a poor heat dissipation effect, in a plastic fan frame with a copper sleeve on the inner edge, the heat generated during operation of the bearing is not effectively and effectively dissipated by the copper sleeve alone. Easy to accumulate inside the motor. Therefore, the internal temperature of the motor easily rises and the possibility of breakage increases, resulting in a shortened service life. Therefore, plastic fan frames with a copper sleeve on the inner edge can only be used when the motor speed is low or the output power is low. This is because, in that case, the motor temperature does not become too high due to overheating due to the high-speed operation of the bearing, and the motor can be prevented from being broken. Therefore, the use of plastic fan frames with a copper sleeve on the inner edge is greatly limited.

[0004] Fan frames made of metal materials such as aluminum have been proposed in view of the shortcomings of the plastic fan frames. The advantage of a metal fan frame is that it has a great heat dissipation effect, so the heat generated during operation of the bearing can be guided to and from the fan frame. Therefore, heat is not accumulated inside the motor, and the motor is not broken. Therefore, metal fan frames can be used both when the motor speed is high and when the output power is high. In the case of a metal fan frame, the running motor does not exceed a certain temperature, so there is no concern that the service life of the motor will be shortened. However, the disadvantages of the metal fan frame are its high cost, heavy weight, and short circuit of the board.

The present invention has been made in view of the above-mentioned problems of the conventional fan frame, and has a light weight and a substrate short circuit prevention advantage of a plastic fan frame, and a wonderful fan frame advantage of a metal fan frame. An object of the present invention is to provide a new and improved fan heat dissipation structure having advantages such as a heat dissipation effect and a long service life of the motor.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, the first embodiment of the present invention employs a fan heat dissipation structure for dissipating heat generated when the fan motor operates, which is located at the center of the motor. A bearing sleeve having a substantially hollow columnar hub fitted into the through-hole, a bottom covering a surface of the base of the plastic fan frame opposite to the surface on which the motor is mounted, and the bottom of the bearing sleeve A plurality of heat dissipating fins provided on the outer periphery of the bearing sleeve, and a portion of the hub portion of the bearing sleeve close to the bottom has a substantially hollow polygonal column shape, and the other portions have a substantially hollow cylindrical shape. A fan heat dissipation structure characterized by

In the fan heat radiation structure adopted in the first embodiment, when the motor is operated, heat generated by rotation of the rotating shaft is transmitted to the bottom portion and the heat radiation fin through the hub portion of the bearing sleeve. The heat generated by the rotation of the blades linked to the rotating shaft can be transferred to the outside of the fan. Furthermore, since the fan heat dissipation structure of the present invention has heat dissipation fins, the contact area of the fan with the outside air is enlarged, and the heat dissipation effect is further enhanced. Therefore, the fan heat dissipation structure of the present invention has a better heat dissipation effect than the conventional plastic fan frame in which a copper sleeve is provided inside, and the excessive rise in temperature inside the motor is suppressed and the service life of the motor is extended. It can be longer and have a wider range of applications.

In addition, in the fan heat radiation structure of the present invention, in addition to providing the heat radiation fins, if a part of the plastic fan frame is covered with a metal having high thermal conductivity, it is comparable to the fan of the metal fan frame. Therefore, it is possible to provide a fan that is less expensive than conventional metal fan frame fans and that does not short circuit the board.

The second embodiment of the present invention employs the shaft in the first embodiment so that the bearing inserted into the through hole of the motor does not advance to the center of the through hole. A stepped portion is provided along the circumferential direction at two appropriate places on the inner periphery of the hub portion of the receiving sleeve, and each of the stepped portions is a fan heat dissipating structure locked to the bearing.

[0010] In a third embodiment of the present invention, in the first embodiment of the present invention, a plurality of engaging grooves are provided on the outer periphery of the polygonal columnar portion of the hub portion. It is provided so as to be engaged with a plurality of locking portions on the base of the fan frame, so that the bearing sleeve can be configured not to be detached from the base of the plastic fan frame.

Further, in a fourth embodiment of the present invention, in the first embodiment, the bearing sleeve and the plurality of radiating fins are made of a similar material. Can be made of alloy. Further, as in the fifth embodiment of the present invention, the bearing sleeve and the plurality of radiating fins can be assembled by separate members.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a fan heat radiation structure according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. As shown in FIGS. 1 and 2, the fan heat dissipation structure according to the present embodiment includes a bearing sleeve 1 integrally formed of a metal material such as an alloy of zinc and aluminum, and a plurality of heat dissipation. And fins 4. The bearing sleeve 1 includes a bottom portion 3 and a substantially hollow columnar hub portion 2. The hub portion 2 has a substantially hollow octagonal (octagonal) column shape near the bottom portion 3 and a substantially hollow cylindrical shape at the other portions. Further, a plurality of engagement grooves 5 are provided on the outer periphery of the octagonal columnar portion of the hub 2, and a step 6 and a step 7 are provided on the inner periphery of the hub 2 along the circumferential direction.

Hereinafter, a method of attaching the fan heat radiation structure according to the present embodiment to a motor will be described. As shown in FIG. 4, the hub 2 of the bearing sleeve 1 is inserted into a through hole 33 at the center of the motor. In order to prevent the hub portion 2 from being detached, the plurality of engagement grooves 5 of the hub portion 2 are provided with a plurality of locking portions 36 (enlarged portion B in FIG. 4) provided on the base 32 of the plastic fan frame supporting the motor. ). The bottom 3 of the bearing sleeve 1 covers the surface of the base 32 of the plastic fan frame opposite to the surface on which the motor is mounted. Bearings 31, 31 are respectively inserted from both open ends of the through hole 33, and the bearings 31, 31 are engaged with the step portions 6 and 7 of the hub 2, so that the center of the through hole 33 is formed. Not proceed. Finally, the rotating shaft 39 of the blade 38 is inserted into the through hole 33 so as to hit the bearings 31. FIG. 3 is a perspective view of the entire fan in which the fan structure according to the present embodiment is mounted on a motor. FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3 of the fan to which the fan heat radiation structure according to the present embodiment is applied.

When the motor operates, the heat generated by the rotation of the bearing 31 is transmitted to the bottom 3 and the radiating fins 4 via the hub 2 of the bearing sleeve 1, and the heat is generated by the airflow caused by the rotation of the blade 38. Carry away. The range covered by the bearing sleeve 1 extends from the through hole 33 at the center of the motor to the base 32 of the fan frame, which is different from the case of a plastic fan frame in which a copper sleeve is provided. In the latter case, a copper sleeve is simply provided in the through hole at the center of the motor, and the heat dissipation range is limited to the inside of the motor. On the other hand, the fan heat radiation structure of the present invention does not accumulate heat generated by the rotation of the bearing 31 inside the motor, but is effectively transferred to the outside of the motor. Further, since the fan heat radiation structure of the present invention has the heat radiation fins 4, the heat radiation effect is further enhanced. The fan heat dissipation structure of the present invention has a better heat dissipation effect than the conventional plastic fan frame with a copper sleeve inside, the service life of the motor is longer, and the application range is wider.

[0015] Furthermore, the fan radiating structure of the present invention is obtained by covering a part of the plastic fan frame with a metal having good thermal conductivity and providing radiating fins, instead of replacing the plastic fan frame with a metal fan frame. Its heat dissipation effect is comparable to that of metal fan frames, its cost is lower than that of conventional metal fan frames, and it does not short-circuit the board unlike metal fan frames.

Although the preferred embodiment according to the present invention has been described above, the present invention is not limited to such a configuration. Those skilled in the art can envisage various modifications and alterations within the scope of the technical idea described in the claims of the utility model. It is understood to be included in the scope.

[0017]

[Effect of the invention]

 In the present invention, the heat generated by the operation of the motor is transmitted to the bottom and the radiating fins via the hub of the bearing sleeve, and heat is radiated efficiently. In addition, the heat generated by the airflow generated by the blades linked to the rotating shaft can be carried outside the fan. Therefore, according to the present invention, it is possible to provide a fan having an excellent heat radiation effect, a longer service life of the motor, and a wider application range. Further, according to the present invention, it is possible to provide a fan which is less expensive and lighter than a conventional fan of a metal fan frame, and which does not cause a short circuit of the substrate. Further, in the present invention, if a member having good thermal conductivity such as metal is used for a part of the bearing sleeve, the heat radiation efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a fan heat radiation structure according to an embodiment of the present invention.

FIG. 2 is a perspective view of a fan heat radiation structure according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a state in which a fan heat radiation structure, a fan frame motor, and blades according to the embodiment of the present invention are assembled.

FIG. 4 is a cross-sectional view taken along line AA of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing sleeve 2 Hub part of bearing sleeve 3 Bottom part of bearing sleeve 4 Radiation fin 5 Engagement groove 6, 7 Step part 31 Bearing 32 Base of fan frame 33 Through hole 36 Locking part 38 Blade 39 Rotating shaft

Claims (6)

[Utility model registration claims] 1. A fan heat dissipation structure for dissipating heat generated when a motor of a fan is operated, comprising: a hub portion having a substantially hollow column shape inserted into a through hole at the center of the motor; A bearing sleeve having a bottom portion covering a surface of the base of the plastic fan frame opposite to the surface on which the motor is mounted; and a plurality of radiating fins provided on an outer periphery of the bottom portion of the bearing sleeve; A portion of the hub portion near the bottom portion has a substantially hollow polygonal column shape, and the other portion has a substantially hollow column shape. 2. A stepped portion is provided along the circumferential direction at two suitable places on the inner periphery of the hub portion of the bearing sleeve so that the bearing inserted into the through hole of the motor does not advance to the center of the through hole. 2. The fan radiating structure according to claim 1, wherein the fan radiating structure is engaged with the bearing. 3. A plurality of engagement grooves are provided on an outer periphery of the polygonal columnar portion of the hub portion so as to engage with a plurality of locking portions on a base of the plastic fan frame.
3. The fan radiating structure according to claim 1, wherein the bearing sleeve is not detached from the base of the plastic fan frame. 4. The bearing sleeve and the plurality of radiating fins are formed by integral molding.
The heat dissipating structure of the fan described in (1). 5. The fan radiation structure according to claim 1, wherein the bearing sleeve and the plurality of radiation fins are assembled by separate members. 6. The fan radiating structure according to claim 1, wherein said bearing sleeve and said plurality of radiating fins are made of a metal material.