CN2488105Y - Small cooling fan - Google Patents

Abstract

A small-sized cooling fan comprises a housing, a rotating member, a protecting cover and a driving assembly. The shell base is provided with a shell base center line, the top plate part of the rotating part is provided with a rotating part center line, and the top plate part is provided with a first contact area and a second contact area which both pass through the rotating part center line. When the rotating member rotates, the rotating member is prevented from axially separating due to the self weight or the thrust of the fan by virtue of the two-point contact effect of the first contact region and the second contact region, and the center line of the rotating member is less prone to deviating or deviating from the center line of the shell seat. Meanwhile, the wear-resistant rubber has the advantages of low manufacturing cost and good wear resistance.

Description

small cooling fan

The utility model relates to a cooling device, in particular to a small cooling fan with a unique "two-point contact" method to prevent axial detachment of a rotating part, avoid axis deviation, low manufacturing cost and good wear resistance.

Conventional small cooling fans for electronic products, as shown in Figure 1, are small cooling fans for computer central processing units, and their typical length, width, and height dimensions are about 2.5, 2.5, and 1.0 cm. Its structure mainly includes: a shell base 91 , a blade part 92 , a bearing part 93 and a motor part 94 . A central shaft 921 extends from the fan blade portion 92 so as to be inserted into the bearing portion 93. Due to the small space, the bearing portion 93 is usually a tubular bushing (which cannot accommodate ball bearings). Therefore, when the fan blade part 92 rotates, the central shaft 921 will rotate in the bearing part 93, and the contact state between them is a cylindrical contact surface, which belongs to surface contact, and the frictional resistance is relatively large. Therefore, some people use self-lubricating bearings. There are many ways to reduce friction, but it causes the problem that the lubricating effect is not long-lasting or it is not easy to add lubricating fluid.

In addition, due to the small space, although it is technically possible to design extremely small ball bearings, the cost of such special-sized ball bearings is too high to be economical.

In addition, since the fan blade part 92 will generate an axial component force when rotating to make the fan blade part 92 disengage, it is necessary to add a thrust washer 922 (such as a C-shaped buckle ring) to prevent the fan blade part from The purpose of disengaging when the leaf portion 92 rotates or sliding out when standing upside down. However, the thrust washer 922 generates another frictional resistance when rotating, which not only reduces the net output of the fan, but also generates another frictional heat.

Therefore, it is highly desirable to develop new products to solve the above-mentioned shortcomings.

The main purpose of this utility model is to provide a small cooling fan, which uses the "two-point contact" structure and the smallest contact area to prevent the rotating part from being separated due to the axial thrust during rotation, and "two-point contact" ” structure makes it difficult for the rotation centerline of the rotating member to deviate or deviate from the centerline of the housing base, achieving the most effective coaxial positioning effect.

Another object of the present invention is to provide a small cooling fan, which can reduce the manufacturing cost due to its simple structure.

Another purpose of the present utility model is to provide a small cooling fan. One or two wear-resistant gaskets can be added on the housing to make the contact parts more wear-resistant and the product to have a longer service life.

The purpose of this utility model is achieved by the following technical solutions.

A small cooling fan, comprising: a shell base with a bottom plate, a central axis extending vertically from the bottom plate and an outer frame, the shell base has an invisible center line of the shell base; a rotating A piece with a top plate, a ring extending from the top plate, and a plurality of blades extending outward from the ring; a drive assembly, including a stator assembly fixed on the housing and a A magnetic assembly fixed on the rotating part; a cover fixed on the outer frame, having several openings for the airflow required by the fan blades to be introduced, and can be led out from the space between the bottom plate and the outer frame; It is characterized in that: the top plate of the rotating part has an invisible center line of the rotating part, and the rotating part is provided with a first contact area and a second contact area, respectively contacting the shell seat and the protective cover, The contact types of the first contact area and the second contact area are single-point or small-area contact, and at the same time, both the first contact area and the second contact area pass through the centerline of the rotating member.

The purpose of this utility model can also be further realized by the following technical measures.

The above-mentioned small cooling fan, wherein the first contact area and a second contact area are arranged on two opposite surfaces of the top plate of the rotating part, the shell seat has a fixed ring wall, and the rotating part has a The rotating ring wall, an air film formed between the fixed ring wall and the rotating ring wall when rotating, can also be called an air bearing.

In the above-mentioned small cooling fan, a conventional bearing sleeve is arranged on the housing, and the rotating part has an extended shaft portion, and the two can be slidably fitted together.

In the above-mentioned small cooling fan, a wear-resistant gasket is provided on the opposite contact portion of the housing seat corresponding to the first contact area.

In the aforementioned small cooling fan, a wear-resistant gasket is provided on the protective cover at the opposite contact portion corresponding to the second contact area.

The utility model adopts the "two-point contact" structure so that the rotation center line of the rotating part is not easy to deviate or deviate from the center line of the housing seat, and achieves the most effective coaxial positioning effect; due to the simple structure, the manufacturing cost can be reduced; and in One or two wear-resistant gaskets are added on the shell seat to make the contact parts more wear-resistant and the product has a longer service life.

In order to further understand the technical content, characteristics and effects of the present utility model, the following preferred embodiments are exemplified, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Figure 1 is an exploded perspective view of a conventional product.

Fig. 2 is a top view of the utility model.

Fig. 3 is a sectional view of the first embodiment of the present utility model.

Fig. 4 is a partially enlarged schematic view of the part shown in Fig. 3 during normal operation.

Fig. 5 is a partially enlarged schematic view of the part shown in Fig. 3 when it is in deviation operation.

Fig. 6 is a sectional view of the second embodiment of the present invention.

Fig. 7 is a cross-sectional view of the third embodiment of the present invention.

Fig. 8 is a sectional view of the fourth embodiment of the present utility model.

Please refer to FIG. 2 to FIG. 5 , which are the first embodiment of the present invention, which is an air bearing fan, which includes: a casing 10 , a rotating part 20 , a cover 30 and a driving assembly 40 .

The case base 10 has a bottom plate portion 11 , a central axis portion 12 vertically extending from the bottom plate portion 11 and an outer frame portion 13 . The case base 10 has an invisible center line X1 of the base plate.

The rotating member 20 has a plate portion 21 , a ring portion 22 extending from the top plate portion 21 , and a plurality of vanes 23 extending outward from the ring portion 22 .

There is a fixed ring wall 15 on the shell base 10, and the rotating member 20 has a rotating ring wall 25, which just forms an air film when rotating between the fixed ring wall 15 and the rotating ring wall 25, and can also be called an air bearing.

The driving assembly 40 includes a stator assembly 41 fixed on the casing 10 and a magnetic assembly 42 fixed on the rotating member 20 to drive the rotating member 20 to rotate.

The protective cover 30 is fixed on the outer frame portion 13 , and has several openings 31 for introducing the required air flow of the fan blade 23 , and leading out from the space between the bottom plate portion 11 and the outer frame portion 13 .

Basically, the top plate portion 21 of the rotating part 20 has an invisible center line X2 of the rotating part, and the rotating part 20 is provided with a first contact area 211 and a second contact area 212, respectively contacting the housing base 10 And the cover 30, the contact types of the first contact area 211 and the second contact area 212 are single point or small area contact (the contact interface can be a plane or a concave arc surface and another bump, hemisphere, contact pattern of pointed cone or embedded steel ball), and at the same time, both the first contact area 211 and the second contact area 212 pass through the centerline X2 of the rotating member.

In this embodiment, the first contact area 211 contacts a top surface 121 of the central shaft portion 12 of the housing 10 with a single point or a small area, and the second contact area 212 contacts the top surface 121 with a single point or a small area. A central inner surface 32 of the cover 30 .

In this way, when the rotating member 20 rotates, due to the two-point contact effect of the first and second contact areas 211, 212, the rotating member can be prevented from being axially disengaged due to its own weight or the thrust of the fan, and the rotation The centerline X2 of the rotating part of the component 20 is less likely to deviate or deviate from the centerline X1 of the housing base.

Figure 3 shows the state during normal operation, while Figure 4 shows the state during deviation (expressed in an exaggerated manner).

That is to say, the utility model mainly uses "air bearing" to support the rotating member 20, and uses the "two-point contact" mode and the minimum contact area of the first contact area 211 and a second contact area 212 to prevent The rotating member 20 is disengaged due to the axial thrust during rotation, and the centerline X2 of the rotating member 20 is less likely to deviate from or deviate from the housing centerline X1 by means of “two-point contact”. To achieve the most effective coaxial positioning effect.

Due to the simple structure of the utility model, the manufacturing cost can be reduced.

As shown in Fig. 6, it is the second embodiment of the present utility model, which is applied to a conventional bearing, wherein, the shell seat 10 is provided with a conventional bearing sleeve 16, and the rotary member has an extended shaft portion 26, The two just slide on and off. In this way, due to the "two-point contact" structure and the minimum contact area with the first contact area 211 and a second contact area 212, the rotating part 20 is prevented from being disengaged due to the axial thrust during rotation, and "two-point contact" The method of “point contact” makes the centerline X2 of the rotating member of the rotating member 20 less likely to deviate or deviate from the centerline X1 of the housing base. To achieve the most effective coaxial positioning effect.

Of course, if the wear resistance is to be strengthened, one or two wear-resistant gaskets 50 can be added on the relative contact parts of the housing base 10 and the cover 30 corresponding to the first contact area 211 and a second contact area 212, so as to It makes the contact parts more wear-resistant and the product has a longer service life.

Fig. 7 is a cross-sectional view of the third embodiment of the present utility model. Two wear-resistant gaskets 50 are provided on the housing base 10 and the protective cover 30, and the extension shaft 26 does not penetrate through them. At this time, the rotating The second contact area 212 of the member 20 is located at the bottom end of the extension shaft portion 26 .

Fig. 8 is a cross-sectional view of the fourth embodiment of the present utility model, the shell seat 10 and the protective cover 30 are provided with two upper and lower wear-resistant gaskets 50, and the extension shaft portion 26 penetrates up and down, at this time, the rotating member The first contact area 211 and the second contact area 212 of 20 are respectively disposed on the top end and the bottom end of the extension shaft portion 26 .

Of course, the case base 10 can also be divided into two parts with an upper part and a lower part with approximately the same thickness, and the protective cover 30 is integrally formed with the upper part of the case part 10 .

The utility model adopts the "two-point contact" method to prevent the axial separation of the rotating part and avoid the deviation of the axis center, and has the advantages of low manufacturing cost and good wear resistance, novelty, creativity and practicability, and meets the requirements of the new patent , so apply in accordance with the law.

The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model, All still belong to within the scope of the technical solution of the utility model.

Claims (5)

1, a kind of small-sized cooling fan comprises:

One shell block has a central axial region and an outer frame that a base plate, is vertically extended by this base plate, and this shell block has an invisible shell block center line;

One rotating part has the multi-disc blade that a top plate portion, is extended outward by this ring portion by the extended ring portion of this top plate portion and;

One driven unit comprises that one is fixedly arranged on the magnet assembly that stator module and on this shell block is fixedly arranged on this rotating part;

One is fixed in the protecting cover of this outer frame, has the opening that several import for the required air-flow of flabellum, and can be derived by the space between this base plate and this outer frame;

It is characterized in that:

The top plate portion of described rotating part has an invisible rotating part center line, this rotating part is provided with one first contact region and one second contact region, contact this shell block and this protecting cover respectively, the contact kenel of this first contact region and this second contact region is single-point or small size contact, simultaneously, this first contact region and this second contact region all pass through this rotating part center line.

2. small-sized cooling fan according to claim 1, it is characterized in that, described first contact region and one second contact region are located on two opposite faces on the top plate portion of this rotating part, has a fixing ring wall on this shell block, this rotating part has a turn ring wall, fixedly form an air film when rotated between ring wall and this turn ring wall, also can be described as air bearing.

3. small-sized cooling fan according to claim 1 is characterized in that, described shell block is provided with a bearing pipe box of commonly using, and this rotating part has one and extends axial region, and both are fit just slidably.

4. small-sized cooling fan according to claim 1 is characterized in that, on the described shell block relative contact site that should first contact region is provided with a wear-resistant gasket.

5. small-sized cooling fan according to claim 1 is characterized in that, on the described protecting cover relative contact site that should second contact region is provided with a wear-resistant gasket.

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