Minitype cooling fan

Abstract

A minitype cooling fan is used for solving the problem that when a minitype cooling fan is designed in the prior art, it cannot be ensured that the minitype cooling fan has good fan performance. The minitype cooling fan comprises a fan frame, a fan wheel, a circuit board and a stator. The fan wheel, the circuit board and the stator are arranged in the fan frame. The stator is electrically connected with the circuit board so that the fan wheel can be driven to rotate and generate airflow. In the axial direction of the minitype cooling fan, a first largest axial height (A) is achieved between a bottom board of the fan frame and a hub of the fan wheel, a second largest axial height (B) is achieved between the bottom board and the circuit board, the first largest axial height is smaller than or equal to 7 mm, and the ratio of the second largest axial height (B) to the first largest axial height (A) is 0.05-0-.45.

Description

technical field [0001] The invention relates to a cooling fan, in particular to a miniature cooling fan suitable for small electronic products. Background technique [0002] Generally speaking, since the electronic components in electronic products will generate heat during operation, many electronic products have been equipped with cooling fans for a long time. The high-temperature gas is discharged to increase the heat dissipation efficiency of electronic products during operation, so that electronic products can maintain stable operation; Among them, common cooling fans can be roughly divided into radial air gaps according to the air gap between the magnetic element and the stator motor fan 8 (as figure 1 shown) with an axial air gap motor fan 9 (as figure 2 shown) two. [0003] Please refer to figure 1 , as far as the existing radial air gap motor fan 8 is concerned, it generally includes a housing base 81, an impeller 82, a circuit board 83 and a stator 84, and the...

AI Technical Summary

Problems solved by technology

[0005] However, although the above-mentioned existing radial air gap motor fan 8 and axial air gap motor fan 9 are sufficient to provide good heat dissipation effect for early electronic products, the existing radial air gap motor fan 8 and axial air gap motor fan The air-gap motor fans 9 are cooling fans of general size. ) is about 30mm or more, and cannot be applied to small electronic products that meet the current development trend of thinning and lightening

Moreover, when intending to manufacture a miniature fan (the total height of the motor in the axial direction is about 7mm or less) that can be packed into small electronic products, it is not based on the existing radial air gap motor fan 8 or axial air gap The motor fan 9 can be scaled down in equal proportions; it is necessary to consider whether the miniaturization of each component is limited in the process technology, and whether the fabricated components can still achieve the expected performance of the fan after assembly (for example, between the stator and the magnetic element). Whether the magnetic effect of the fan can generate enough rotational torque to drive the fan wheel to rotate relative to the housing and generate the expected air volume) and other factors have made the development of micro fans face great difficulties and challenges

[0006] That is to say, with the development trend of thinner, thinner and high-performance small electronic products, when small electronic products are in operation, the heating temperature of their electronic components will increase, and factors such as limited heat dissipation space will make the heat dissipation of electronic components more efficient. It is not easy, so it is easy to produce unstable performance, affect the reliability of small electronic products, and cause functional characteristics to decline, fail to perform or even crash; therefore, even when making micro fans, it can overcome the limitations of process technology The radial air-gap motor fan 8 or the axial air-gap motor fan 9 are proportionally reduced to make a micro fan, but after the micro fan is assembled into a small electronic product, the amount of driving air produced by the micro fan during operation is not certain Can meet the heat dissipation needs of small electronic products

[0007] In addition, as far as the structure of the existing radial air gap motor fan 8 and axial air gap motor fan 9 is concerned, the circuit board 83 of the existing radial air gap motor fan 8 is fitted on the shaft tube 812 Outer ring peripheral surface, so that there is a space between the bottom of the circuit board 83 and the bottom plate 811, so that the overall axial height of the existing radial air gap motor fan 8 is difficult to reduce; similarly, the axial air gap The stator 94 of the gap motor fan 9 is obtained by winding a coil, and the coil must be wound with a sufficient number of turns to provide an appropriate excitation effect, so the stator 94 must have a certain axial thickness, which also becomes the Reasons why it is difficult to reduce the overall axial height of the existing axial air gap motor fan 9

[0008] Therefore, the structural types of the existing radial air gap motor fan 8 and the axial air gap motor fan 9, as well as the proportional relationship between the components, are not suitable for use as a reference standard for the micro fan, so that the micro fan can During the development process, it is often necessary to use the designer's experience or try and error to carry out the structural design of its components, and to perform repeated fan performance tests until the fan performance meets the specification requirements, which adds a lot of development time and effort. labor

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