KR100800573B1 - Micro fan - Google Patents

Abstract

A micro fan is provided to attenuate an air flow field since an air inlet is opened, thereby preventing generation of turbulence, vibrations and noises. A micro fan includes an impeller(10), a fan seat(20), and a bottom cover plate(21). The impeller includes a spindle, a shaft seat, a plurality of blades, an upper ring, a bottom ring, and a permanent magnet. The shaft seat is disposed at one end of the spindle. The upper ring and the bottom ring are disposed at a periphery of each blade. The fan seat has an annular wall(201). A stator accommodating slot(202) is formed between the annular wall and the outer wall of the fan seat. An air inlet(203) is formed in upstream of the fan seat. An air induction flange(204) is formed around the air inlet.

Description

Micro Fan {MICRO FAN}

1 is a cross-sectional view showing a state of assembly of the prior art (Patent No. (Taiwan Patent), 593897);

2 is a 3D exploded view showing a preferred embodiment of the present invention;

3 is a 3D external view showing the microfan impeller of the present invention;

4 is a sectional view showing a micro fan impeller of the present invention; And

5 is a cross-sectional view showing an assembled state of the present invention.

The present invention relates to a microfan, and more particularly, to a microfan having a structure that increases the air rate and relaxes the air flow field without the problem of concentricity alignment.

Like the brushless direct current micro fan, patent No. 593897 (Taiwan patent) described in FIG. 1 and described in Appendix 1, the designed micro fan has an annular hub 30, two bearings 31, a permanent magnet. Set 32, impeller set 33, and coil set 34.

The annular hub 30 has an air outlet 301, a cover plate 302 and an air inlet 303. The bearings 31 are fixed to a cover plate 302 having an annular hub 30 and respective support rods, the two bearings 31 having to be axially aligned to support the spindle 321 therein.

The impeller set 33 has a plurality of radially extending blades 331, and the permanent magnet set 32 is wrapped in the impeller set 33 and disposed on its center and spindle 321.

The coil set 34 is formed of a plurality of coils provided on the resilient circuit board 341, and the coils are electrically interconnected to generate a vibrating magnetic field, thereby rotating the permanent impeller set 33. Drive set 32.

However, the impeller set 33 of the brushless DC micro fan is fixedly arranged on the spindle 321 and the spindle is rotated between two bearings arranged pivotally across the spindle 321. As a result, this structure raises several problems:

(1) Eccentric Alignment Difficulty of Two Bearings 31-Since the impeller set 33 rotates between two bearings pivotally disposed across the spindle 321, the eccentric alignment accuracy between the two bearings 31 is impeller Of great importance directly to the rotational deflection of the entire set 33. The larger the eccentricity error value between the two bearings 31, the larger the rotational deflection of the entire impeller set 33 is. On the other hand, the two bearings 31 are arranged in the annular hub 30 and the cover plate, respectively, which makes the alignment of the two bearings 31 more difficult.

(2) Air supply area limitation at the air inlet 303-The cover plate 302 located next to the air inlet 303 is connected with a support rod for fixing the bearings 31. That is, the support rods and bearings 31 span the air inlet 303, consequently blocking the air supply area to affect the air supply rate.

(3) Turbulence and Vibration Tendency—Because the support rods and bearings 31 span the air inlet 303, the air supply area is blocked and the airflow at the air inlet 303 is disturbed, thus turbulence and vibration Occurs easily.

Accordingly, in order to completely solve the problems inherent to the brushless DC micro fan, a micro fan with a new idea must be actively designed and developed to solve the problem of spindle alignment difficulty.

In accordance with this aspect, the present invention provides a micro fan comprising an impeller, a fan seat and a bottom cover plate.

The impeller has a spindle, the shaft seat is fixedly positioned at one end of the spindle, a number of blades extend at the shaft seat periphery, and the top ring and the bottom ring are each blade outer rims. Provided at the top and bottom ends, the permanent magnet is disposed on each blade outer rim and secured between the top and bottom rings.

An annular wall is provided in the fan seat, an impeller is inserted in the center of the annular wall, and the annular wall is surrounded by the stator receiving slots. The air inlet is located at the fan seat position corresponding to the impeller. An inwardly inclined air guide flange is provided inside the air inlet and the air inlet hole diameter should be slightly smaller than the impeller maximum outer diameter.

An air outlet is provided in the center of the bottom cover plate, a plurality of support rods are connected with the shaft tube inside the air outlet, and the shaft tube is provided with a bearing therein, so that the impeller spindle can be inserted into the bearing in a rotational manner.

Since the impeller spindle of the present invention relies on only a single bearing for support and rotation, there is no eccentric alignment problem first, and there is no blockage at the fan seat air inlet, resulting in no clogging. In addition, each blade of the impeller can extend upward to the maximum outer end of the air inlet, thereby increasing the air supply rate and easing the airflow meter.

The present invention relates to a micro fan as shown in FIG. 2, and largely includes an impeller 10, a fan seat 20, and a bottom cover plate 21.

3 and 4, the impeller 10 has a spindle 11, the shaft seat 12 is disposed at one end of the spindle 11, and the plurality of blades 13 is formed around the shaft seat 12. Extending outwards, the top ring 14 and the bottom ring 15 are disposed on each blade 13 edge, with the top ring concave at the top edge of each blade 13 outer edge. are arranged concavely, and the bottom ring 15 is concavely arranged at the bottom edge of the outer edge of each blade 13. The permanent magnet 16 is disposed on each blade outer rim and is fixed between the upper ring 14 and the bottom ring 15. Snap protrusion 151 is optionally disposed on top ring 14 or bottom ring 15 adjacent to permanent magnet 16 (bottom ring is selected in FIG. 4), permanent magnet 16 It is firmly engaged with the top ring and the bottom rings 14, 15 to prevent breakaway during rotation.

The fan seat 20 has an annular wall 201 so as to form a space for accommodating the impeller 10 in the inner center thereof, and the stator receiving slot 202 has an outer circumference of the annular wall 201 and the fan seat 20 wall. It is formed between. An air inlet 203 is formed on the upper side of the fan seat 20, and an inwardly inclined air induction flange 204 is formed around the air inlet 203, and an air inlet ( 203) The inner hole diameter should be slightly smaller than the impeller 10 maximum outer diameter.

The air outlet 211 has a shaft tube 213 formed in the center of the bottom cover plate 21 and having an abrasive plate 22, a bearing and a positioning plate 24 therein, wherein the shaft tube 213 Is integrally coupled with the air outlet inner wall by a plurality of support rods 212, and a fitting edge 214 is disposed on the outer periphery of the air outlet 211.

As shown in FIGS. 2 and 5, a magnetic absorption positioning plate 25 is provided on the inside of the fitting edge 214 of the bottom cover plate 21. The spindle 11 of the impeller 10 is inserted into the bearing hole so that the impeller 10 can be pivotally arranged above the bottom cover plate 21.

The stator set 26 is disposed in the stator receiving slot 202 of the fan seat 20, and then the impeller 10 is casing in the fan seat. The stator set 26 and the permanent magnet 16 of the impeller 10 are divided and coincided by the annular wall 201 so that the impeller 10 is driven to rotate by the vibrating magnetic field of the stator set 26. do. Moreover, the annular wall 201 of the fan seat 20 is inserted into the fitting edge 214 and the magnetic absorption positioning plate 25 is snapped so that the downward magnetic attraction force is permanent in the impeller 10. By affecting the magnet, a stable rotation of the impeller 10 is ensured by the attraction of the magnetic absorption positioning plate 25 track.

In contrast to conventional brushless DC microfans, the present invention has at least the following features:

(1) There is no problem of spindle alignment-the shaft seat 12, the blades 13, etc. of the impeller 10 are fixedly placed at one end of the spindle 11, and the other end of the spindle 11 is inserted into the bearing 23. do. Since support and rotation are only dependent on the single bearing 23, there will be no problem of eccentric alignment.

(2) Abundant Air Supply Rate-Since the impeller 10 is supported by the bearing 23 and rotated therein, the air inlet 203 on the upper side of the fan seat 20 is fully open and there is no blockage. Thus, the blades on the impeller 10 can extend upward to the outer maximum end of the air inlet, thereby increasing the area of the blades in direct contact with the airflow and increasing the air supply rate.

(3) Mitigation and Turbulence Free of the Airflow System-Since the air inlet 203 is open and unobstructed, the airflow system is relaxed and thus no turbulence, vibration and noise problems occur.

Overall, from these features described above, these properties are new and enterprising as well as industrially available in contrast to similar products.

Although the present invention has been described by the presently considered optimal embodiments and preferred embodiments, it is to be understood that the present invention is not limited to the described embodiments. In contrast, it is intended to cover various modifications and similar arrangements that fall within the spirit and scope of the appended claims, and should be construed to include all such modifications and similar structures in accordance with the broadest interpretation.

Claims (12)

An impeller having a spindle, a shaft sheet fixedly disposed at one end of the spindle, a plurality of blades extending from an outer periphery of the shaft sheet, and a permanent magnet disposed on an outer edge of each blade; A fan seat having an annular wall into which the impeller is inserted into the center, a stator set and receiving a stator receiving slot positioned next to an outer circumference of the annular wall, and an air inlet disposed above; And A bottom having a centrally located air outlet, a plurality of support rods located inside the air outlet and connected to the shaft tube, and a bearing located inside the shaft tube in which the spindle of the impeller is inserted centrally in a rotational manner; Micro fan, consisting of a cover plate. The microfan of claim 1, wherein an air induction flange is disposed at the air inlet and has an inner edge formed to be inclined inwardly, and the inner hole of the air inlet is slightly smaller than the maximum outer diameter of the impeller. The microfan of claim 1, wherein a top ring and a bottom ring are disposed at the top and bottom ends of the outer edges of the respective blades, and the permanent magnet is fixed between the top ring and the bottom ring. The microfan of claim 3, wherein the snap protrusion is disposed on one side of the upper ring and positioned adjacent to the permanent magnet. 4. The microfan of claim 3, wherein the snap protrusion is disposed on one side of the bottom ring and positioned adjacent to the permanent magnet. 2. The fitting edge according to claim 1, wherein a fitting edge is disposed on the outer circumference of the air outlet so that the annular wall is inserted, a magnetic absorption positioning plate is disposed on the inner side of the fitting edge and snapped into place, and the annular wall is the fitting edge. And fitted with a micro pan. A spindle, a shaft seat fixedly disposed at one end of the spindle, a plurality of blades extending from an outer periphery of the shaft sheet, and a permanent magnet disposed on an outer edge of each blade and fixed between an upper ring and a bottom ring. Branch impeller; An annular wall into which the impeller is inserted into the center, a stator set is accommodated, a stator accommodating slot positioned next to the outer circumference of the annular wall, an air inlet disposed at an upper side, and an air inlet disposed in the air inlet, and an inner hole diameter A fan seat with an air guide flange smaller than the maximum outer diameter of the fan seat; And A bottom having a centrally located air outlet, a plurality of support rods located inside the air outlet and connected to the shaft tube, and a bearing located inside the shaft tube in which the spindle of the impeller is inserted centrally in a rotational manner; Micro fan, consisting of a cover plate. 8. The microfan of claim 7, wherein said air guide flange has an inwardly-inclined inner edge. 8. The microfan of claim 7, wherein the top ring and the bottom ring are located at the top and bottom ends of each blade of the impeller. The micro pan of claim 7, wherein the snap protrusion is disposed at one side of the permanent magnet adjacent to the upper ring. The micro fan of claim 7, wherein the snap protrusion is disposed at one side of the permanent magnet adjacent to the bottom ring. 8. The fitting edge of claim 7, wherein a fitting edge is disposed on the periphery of the air outlet such that the annular wall is inserted, a magnetic absorption positioning plate is provided and snapped onto the inside of the fitting edge, and the annular wall is fitted to the fitting edge. Micro pans, characterized in that inserted in.

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