cooling fan

Abstract

A cooling fan comprises a fan frame, a stator, a fan wheel and at least one limit part. The fan frame comprises an air inlet and an air outlet. An air flow channel is formed between the air inlet and the air outlet, and a coupling portion is arranged in the air flow channel of the fan frame. The stator is connected into the fan frame. The fan wheel comprises a rotation shaft and a permanent magnet. The rotation shaft is connected with the coupling portion rotatably, the permanent magnet is aligned with the stator, and a plurality of blades are arranged on the peripheral side of the fan wheel. The limit parts are arranged at the position of the air inlet circumference of the fan frame and comprise retaining sheets extending to the top of the blade rotation range of the fan wheel. A guide plane is arranged at one side end of each retaining sheet, so that the fan wheel cannot be separated from the fan frame and can be guided to return to the accurate assembly position.

Description

technical field [0001] The invention relates to a heat dissipation fan, in particular to a heat dissipation fan which can ensure that the fan wheel will not come out arbitrarily. Background technique [0002] Existing cooling fans generally have the function of preventing the fan wheel from falling out, so as to prevent the fan wheel from arbitrarily detaching from the predetermined assembly position of the cooling fan during the process of handling, loading or packaging. [0003] Such as figure 1 As shown, it is the new patent No. M309021 "Micro Fan" in Taiwan, China, which discloses a conventional cooling fan 8, which includes a fan wheel 81, a shell seat 82 and a bottom cover plate 83. The fan wheel 81 is provided with a shaft 811 and a permanent magnet 812; the housing base 82 has an air inlet 821, and the air inlet 821 is provided with an inwardly inclined guide flange 822; the bottom cover plate 83 is combined with the housing The base 82, and the bottom cover 83 has...

AI Technical Summary

Problems solved by technology

[0006] However, when the cooling fan 9 is applied to various electronic products, and the rotation of the fan wheel 92 is used to dissipate heat, if the electronic product shakes due to external force, the fan wheel 92 will easily go outside the fan frame 91. Axial displacement makes the fan wheel 92 and the stop piece 931 of the fan frame 91 form a locking phenomenon, and then the fan wheel 92 cannot rotate smoothly

[0007] For example, since the baffle 931 of the limiting member 93 is not further provided with a structural design for guiding the vane 921, when the heat dissipation fan 9 is applied to mobile electronic products such as mobile phones or notebook computers, if the user When shaking occurs due to the use of this mobile electronic product, if image 3 As shown, even if the fan wheel 92 can be stopped by the catch 931 when it wants to break away from the fan frame 91, only the end edge of the blade 921 of the fan wheel 92 may still form with the end edge of the catch 931 as shown in the figure. As a result, the fan wheel 92 cannot return to the correct assembly position and cannot operate normally, resulting in poor heat dissipation of the electronic product, which will affect its service life, so it is still necessary to improve

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