CN212643137U - Heat radiation fan - Google Patents

Abstract

The utility model discloses a cooling fan, including fan frame and fan wheel. The fan frame comprises a bottom plate, a side wall and a cover plate, wherein the bottom plate, the side wall and the cover plate form a containing chamber, the fan wheel is arranged in the containing chamber, and the fan wheel comprises a hub and fan blades arranged on the outer edge of the hub; wherein, in the direction perpendicular to the bottom plate, the maximum vertical height is formed between the cover plate and the bottom plate, and the ratio of the height of the fan blades to the maximum vertical height is 0.3-0.7. The utility model has the advantages that: the ratio of the height of the fan blade to the maximum vertical height between the cover plate and the bottom plate is limited in a certain range, so that the development efficiency is improved, and the damage to the fan blade due to the backpressure problem can be avoided on the basis of ensuring the efficiency of the fan.

Description

Heat radiation fan

Technical Field

The utility model belongs to the technical field of radiator fan, concretely relates to miniature radiator fan suitable for among small-size electronic product.

Background

Because electronic components in the electronic product can generate heat during operation, the electronic product is basically provided with a cooling fan, airflow is forced to flow by utilizing the wind dispelling effect of the cooling fan, so that the heat in the electronic product is discharged, and the influence of overhigh temperature on the normal operation of the electronic product and even the burning of circuit devices by the circuit components in the electronic product are avoided.

Along with the development trend of light weight, thinness and high performance of electronic products, the heat productivity of electronic elements of the electronic products is gradually increased, in order to avoid the influence of overhigh heat on the use experience of the products, the heat dissipation requirement of using an ultrathin fan is also increased, but the early development is basically carried out by virtue of the experience of designers and trial and error methods, namely, the size proportion of components of the heat dissipation fan is not regular, the development cost is greatly increased, the development efficiency is also influenced, if poor design is forcibly produced in mass production under the pressure of time on the market, the manufacturing process is poor and higher, and the cost is wasted.

Therefore, in order to solve the above-mentioned problems, it is necessary to provide a heat dissipation fan, which improves the fan efficiency and reduces the development cost by improving the proportional relationship between the fan blades and the fan frame.

Disclosure of Invention

An object of the utility model is to provide a radiator fan to radiator fan's among the solution prior art problem.

In order to achieve the above object, an embodiment of the present invention provides the following technical solutions:

in one embodiment, the present application provides a heat dissipation fan, including: the fan frame comprises a bottom plate, side walls and a cover plate, wherein the bottom plate, the side walls and the cover plate form a containing chamber;

the fan wheel is arranged in the containing chamber and comprises a hub and fan blades arranged on the outer edge of the hub;

the cover plate and the bottom plate have the maximum vertical height in the direction perpendicular to the bottom plate, and the ratio of the height of the fan blades to the maximum vertical height is 0.3-0.7.

Optionally, the ratio is 0.4-0.6.

Optionally, the bottom plate comprises opposite outer and inner surfaces, the cover plate comprises opposite outer and inner surfaces, and the maximum vertical height between the cover plate and the bottom plate is the distance between the outer surface of the bottom plate and the outer surface of the cover plate.

Optionally, the cover plate and the bottom plate are arranged oppositely, one end of the side wall is arranged on the inner surface of the cover plate, and the other end of the side wall is connected with the outer surface of the bottom plate.

Optionally, the fan frame further includes a middle pipe disposed on the bottom plate.

Optionally, the impeller further includes a rotating shaft, one end of the rotating shaft is disposed on the hub, and the other end of the rotating shaft is rotatably disposed in the middle tube.

Optionally, the hub includes a horizontal extending portion, and the rotating shaft is disposed at a central position of the extending portion.

Optionally, the rotating shaft is provided with a groove, the side wall of the middle pipe is provided with a blocking piece, and when the rotating shaft is matched with the middle pipe in the middle pipe, the blocking piece is clamped in the groove.

Optionally, a wear-resistant plate is arranged between the rotating shaft and the inner surface of the bottom of the middle pipe.

Optionally, one end of the rotating shaft close to the wear-resistant plate is spherical.

Compared with the prior art, the utility model discloses a prescribe a limit to the certain limit with the ratio of the height of flabellum and the maximum vertical height between apron and the bottom plate to development efficiency has been improved, and can avoid damaging the flabellum because the backpressure problem on the basis of guaranteeing fan efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a partial cross-sectional view of a heat dissipation fan according to an embodiment of the present application;

fig. 2 is a partially enlarged view of fig. 1.

Detailed Description

The present invention will be described in detail below with reference to embodiments shown in the drawings. The embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to the embodiments are included in the scope of the present invention.

Referring to fig. 1 and 2, the present invention provides a heat dissipation fan, including: the fan comprises a fan frame 1 and a fan wheel 2 arranged in the fan frame 1; the fan frame 1 comprises a bottom plate 11, a side wall 13 and a cover plate 14, wherein the bottom plate 11, the side wall 13 and the cover plate 14 form a containing chamber; the impeller 2 is disposed in the accommodating chamber and includes a hub 21 and a fan blade 23 disposed on an outer edge of the hub 21.

The fan frame 1 includes a bottom plate 11, a side wall 13, and a cover plate 14. The bottom plate 11 includes an outer surface and an inner surface opposite to each other, the cover plate 14 includes an inner surface and an outer surface opposite to each other, one end of the sidewall 13 is disposed on the inner surface of the cover plate 14, and the other end of the sidewall is disposed on the outer surface of the bottom plate 11, so as to form an accommodating chamber capable of accommodating other components of the heat dissipation fan. Therefore, the combination among the bottom plate 11, the side wall 13 and the cover plate 14 is more stable and is not easy to fall off.

The bottom plate 11 is formed with a notch through which the middle tube 12 is fitted to the bottom plate 11. The middle tube 12 includes a bottom portion 122 and a side wall 123 embedded in the bottom plate 11, the bottom portion 122 includes an inner surface and an outer surface opposite to each other, and specifically, the middle tube 12 is made of copper. The wear-resistant plate 15 is attached to the inner surface of the bottom 122, and the wear-resistant plate 15 has good wear resistance, so that the wear caused by the long-term rotation of the rotating shaft 22 can be effectively reduced, and the bottom 122 of the middle pipe 12 is indirectly protected. In a specific application, the wear-resistant sheet 15 may be made of PU material. The sidewall 123 of the middle tube 12 is provided with a step, the step is provided with a baffle 124, the baffle 124 is provided with a bearing 125, wherein the inner diameter of the baffle 124 is smaller than the diameter of the bearing 125.

The impeller 2 is disposed in the accommodating chamber, and includes a hub 21 and a rotating shaft 22, wherein one end of the rotating shaft 22 is fixed to the hub 21, the hub 21 includes an extending portion along a horizontal direction, and preferably, the rotating shaft 22 is disposed at a central position of the extending portion along the horizontal direction of the hub 21. The inner surface of the hub 21 is provided with magnetic elements.

The other end of the rotating shaft 22 is rotatably disposed in the bearing 125, and a groove is disposed at one end of the rotating shaft 22 close to the wear-resistant plate 15, and when the rotating shaft 22 is fitted in the middle tube 12, the blocking plate 124 is snapped into the groove, so that the rotating shaft 22 can be more stable during rotation. One end of the rotating shaft 22 close to the wear-resistant sheet 15 is spherical, and the contact area of the rotating shaft 22 and the wear-resistant sheet 15 is smaller than the area of the cross section of the rotating shaft 22, so that the friction between the rotating shaft 22 and the wear-resistant sheet 15 during rotation can be reduced, the rotating speed is improved, and the noise generated during rotation is reduced.

In the direction perpendicular to the base plate, the cover plate 14 and the base plate 11 have a maximum vertical height N, and the ratio of the height M of the fan blades 23 to the maximum vertical height N is 0.3-0.7. Wherein the maximum vertical height N is a distance between an outer surface of the cover plate 14 and an outer surface of the base plate 11. Preferably, the ratio is 0.4 to 0.6.

It should be understood that when the above ratio is small, the height of the fan blade 23 is small, and the performance of the fan is poor, thereby resulting in poor heat dissipation. When the ratio is large, that is, the height of the fan blade 23 is high, the fan blade 23 easily touches the fan frame 1 during the manufacturing process, resulting in low production yield. In addition, when the fan blade 23 is too high, there is a problem of back pressure, and since the pressure-resistant space is small, the fan blade 23 is easily pressed when using an electronic product. For example, when a notebook computer is used, the fan blades 23 are easily pressed during keyboard pressing or carrying, which may cause damage.

The heat radiation fan also comprises a circuit board and a stator which are used for driving the fan to work. The circuit board is arranged on the outer periphery of the middle pipe 12 and connected with an external power supply, and the stator is arranged on the circuit board. An inductive air gap is arranged between the stator and the magnetic element. The stator includes magnetic conduction piece group, insulating cover group and coil assembly, and magnetic conduction piece group can include a plurality of magnetic conduction pieces, and these a plurality of magnetic conduction pieces stack the setting in the vertical direction, and wherein, magnetic conduction piece can be the silicon steel sheet. The insulating sleeve set is arranged at two end parts of the magnetic conducting sheet set in the vertical direction, and the coil set is wound and combined with the magnetic conducting sheet set and the insulating sleeve set. The coil assembly is connected with the circuit board.

The utility model discloses a ratio with the height of flabellum and the maximum vertical height between apron and the bottom plate is injectd in certain extent to development efficiency has been improved, and can avoid damaging the flabellum because the backpressure problem on the basis of guaranteeing fan efficiency.

The following is a table comparing the fan efficiency, the sustainable back pressure and the yield when the fan blade height M and the maximum vertical height N are different, i.e. M/N is different.

	Value of M/N	Efficiency of	Can bear back pressure	Yield of good products
					Comparative example 1	0.2	C	Superior food	100％
Example 1	0.3	B	Superior food	100％
					Example 2	0.4	A	Superior food	100％
Example 3	0.5	A	Superior food	100％
					Example 4	0.6	A	Superior food	100％
Example 5	0.7	B	In	95％
					Comparative example 2	0.8	C	Difference (D)	20％

Wherein, the level A indicates the best fan efficiency, the level B indicates the fan efficiency inferior to the level A, and so on, and the fan efficiency of the level D is lower than the fan efficiency of the level C. It should be understood that the performance level of the fan is used to comprehensively characterize the air volume and noise of the fan.

As can be seen from the data in the above table, when the ratio of the blade height M to the maximum vertical height N, i.e., the value of M/N, is less than 0.3, the air volume of the fan is small, the efficiency is low, and the heat dissipation effect is poor; when the value of M/N is more than 0.7, the bearable back pressure is small, and the yield is low. That is, when the M/N value is 0.3-0.7, the efficiency, the sustainable back pressure and the yield of the fan are all in a better state. Especially, when the M/N value is 0.4-0.6, the heat radiation fan is in the best working state.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. A heat dissipating fan, comprising:

the fan frame comprises a bottom plate, side walls and a cover plate, wherein the bottom plate, the side walls and the cover plate form a containing chamber;

the fan wheel is arranged in the containing chamber and comprises a hub and fan blades arranged on the outer edge of the hub;

the cover plate and the bottom plate have the maximum vertical height in the direction perpendicular to the bottom plate, and the ratio of the height of the fan blades to the maximum vertical height is 0.3-0.7.

2. The heat dissipating fan of claim 1, wherein the ratio is 0.4-0.6.

3. The heat dissipating fan of claim 1, wherein the base plate includes opposing outer and inner surfaces, and the cover plate includes opposing outer and inner surfaces, the maximum vertical height between the cover plate and the base plate being the distance between the outer surface of the base plate and the outer surface of the cover plate.

4. The heat dissipating fan as claimed in claim 3, wherein the cover plate is disposed opposite to the base plate, one end of the sidewall is disposed on an inner surface of the cover plate, and the other end of the sidewall is connected to an outer surface of the base plate.

5. The heat dissipating fan of claim 1, wherein the fan frame further comprises a middle tube disposed on the base plate.

6. The heat dissipating fan as claimed in claim 5, wherein the impeller further comprises a shaft having one end thereof disposed on the hub, and the other end of the shaft is rotatably disposed in the middle tube.

7. The heat dissipating fan as claimed in claim 6, wherein the hub includes a horizontal extension portion, and the rotation shaft is disposed at a center of the extension portion.

8. The heat dissipating fan of claim 6, wherein the shaft has a groove, and the sidewall of the middle tube has a blocking piece, and the blocking piece is blocked in the groove when the shaft is fitted in the middle tube.

9. The heat dissipating fan of claim 6, wherein a wear pad is disposed between the shaft and the inner surface of the bottom of the middle tube.

10. The heat dissipating fan of claim 9, wherein the end of the shaft adjacent to the wear plate is spherical.

Images