CN201786755U - cooling fan - Google Patents

Abstract

A heat dissipation fan comprises a fan frame, a fan wheel and a coil assembly. The fan frame has an air inlet and an air outlet, a channel and a guide portion are formed between the air inlet and the air outlet, and a turning portion is formed between the channel and the guide portion; the fan wheel and the coil assembly are combined with the interior of the fan frame; wherein the fan wheel defines a central axis, the guide portion of the fan frame radially expands outward with the central axis as a reference, and the fan wheel further defines a first reference plane and a second reference plane, the first reference plane passes through the top edge of the fan wheel and is perpendicular to the central axis, the second reference plane passes through the bottom edge of the fan wheel and is perpendicular to the central axis, and the turning portion is located between the first reference plane and the second reference plane; thereby, the guide effect is improved and the noise is reduced.

Description

cooling fan

technical field

The utility model relates to a heat dissipation fan, in particular to an axial flow heat dissipation fan with an air outlet designed with a guide part.

Background technique

Referring to FIG. 1 , a conventional axial cooling fan 7 is disclosed. The cooling fan 7 includes a fan frame 71 , a fan wheel 72 and a motor 73 . The fan frame 71 forms an air inlet 711 and an air outlet 712 opposite to each other in the axial direction, and a base 713 is provided inside the fan frame 71; the fan wheel 72 is rotatably combined in the fan frame 71; the motor 73 is combined with the base 713 of the fan frame 71 to drive the fan wheel 72 to rotate to provide a cooling effect.

However, the air outlet 712 of the heat dissipation fan 7 does not have a structural design that can increase the air outlet area and provide a flow guide function, and it is easy to form an unstable flow field and generate undue noise, thereby reducing the heat dissipation effect; therefore, in today's electronic products While the performance of the electronic product is continuously improved, the heat dissipation fan 7 cannot fully meet the actual heat dissipation demand of the electronic product.

For this reason, please refer to shown in Fig. 2, for China Taiwan application No. 200942148 " fan and fan frame thereof " invention patent case, the fan frame 81 that this existing cooling fan 8 uses has a passage 811, and this passage 811 two ends An air inlet 812 and an air outlet 813 are respectively formed; in addition, the fan frame 81 is adjacent to the air outlet 813 to form a guide portion 814 extending radially outward; When the fan wheel 82 rotates, the air outlet 813 can increase the air outlet area of the airflow by means of the guide part 814 to improve the heat dissipation effect of the existing cooling fan 8 .

Please refer to FIG. 2 again, the position where the channel 811 of the existing cooling fan 8 and the air guiding part 814 are adjacent to each other is a turning part C, and the turning part C is adjacent to the opening periphery of the air outlet 813, in other words, The structural design of the existing cooling fan 8 will easily cause the depth d1 of the channel 811 in the axial direction to be much larger than the depth d2 of the guide part 814 in the axial direction; During the process of the air inlet 812 passing through the channel 811 and the guide part 814 in sequence, the guide part 814 can be used to guide the airflow to a very limited effect, and the effect of increasing the air outlet area cannot be effectively achieved; moreover, the airflow is more It is easy to be concentrated between the channel 811 and the fan wheel 82, so that the fan wheel 82 may generate relatively large wind shear noise during the process of guiding the airflow, so it is necessary to improve it.

Utility model content

The purpose of the utility model is to improve the above-mentioned shortcomings of the existing heat dissipation fan, and provide a heat dissipation fan which can further improve the flow guiding effect of the air outlet.

Another object of the present invention is to provide a cooling fan that can effectively reduce wind shear noise.

According to the utility model, the cooling fan includes: a fan frame with an air inlet and an air outlet, a passage and a guide part are formed between the air inlet and the air outlet, and the passage and the guide part are connected to the fan. A turning portion is formed where the inner peripheral walls of the frame are adjacent to each other; a fan wheel is rotatably combined with the inside of the fan frame; and a coil group is arranged inside the fan frame to drive the fan wheel to rotate; wherein the fan wheel A central axis is defined, and the guide part of the fan frame expands radially outwards based on the central axis. The fan wheel also defines a first reference plane and a second reference plane. The first reference plane passes through the fan wheel The top edge of the fan wheel is perpendicular to the central axis, the second reference plane passes through the bottom edge of the fan wheel and is perpendicular to the central axis, and the turning portion is located between the first reference plane and the second reference plane.

The beneficial technical effect of the utility model is that: since the channel and the guide part form a turning part at the position where the inner peripheral wall of the fan frame is adjacent to each other, and the turning part is just located between the first datum plane and the second datum plane Therefore, when the fan wheel introduces the airflow into the channel through the air inlet, the pressure accumulation effect provided by the channel, and after the fan wheel guides the airflow into the guide part, the guide provided by the guide part As a result, the two will be more balanced, so as to avoid the generation of turbulent flow and improve the cooling effect of the cooling fan.

Description of drawings

Fig. 1: A combined sectional view of the first type of conventional cooling fan.

Fig. 2: A combined sectional view of the second type of conventional cooling fan.

Fig. 3: A three-dimensional exploded view of the cooling fan of the first embodiment of the present invention.

Fig. 4: A combined cross-sectional view of the cooling fan of the first embodiment of the present invention.

Fig. 5: A combined sectional view of the cooling fan according to the second embodiment of the present invention.

Fig. 6: A combined cross-sectional view of the cooling fan according to the third embodiment of the present invention.

[Description of main component symbols]

1a, 1b, 1c cooling fan 11 fan frame 111 air inlet 112 air outlet

113 Base 114 Connecting piece 115 Shaft joint 116 Channel

117 deflector 12 fan wheels 121 hub 122 blades

13 coil group 7 cooling fan 71 fan frame 711 air inlet

712 Air outlet 713 Base 72 Fan wheel 73 Motor

8 cooling fans 81 fan frames 811 channels 812 air inlets

813 air outlet 814 guide part 82 fan wheel

Detailed ways

In order to make the above-mentioned and other purposes, features and advantages of the present utility model more obvious and easy to understand, the preferred embodiments of the present utility model are specially cited below, together with the accompanying drawings, for detailed description as follows:

Referring to FIG. 3 , the cooling fan 1 a of the first embodiment of the present invention at least includes a fan frame 11 , a fan wheel 12 and a coil assembly 13 . The fan frame 11 can be the frame body of an axial flow fan; the fan wheel 12 is rotatably combined inside the fan frame 11; the coil group 13 is arranged inside the fan frame 11 to drive the fan wheel 12 Rotation works.

The fan frame 11 forms an air inlet 111 and an air outlet 112 opposite in the axial direction, and a base 113 is provided inside the fan frame 11, and the base 113 can be connected by several connecting parts 114 (such as ribs or vanes) etc.) to connect the inner peripheral wall of the fan frame 11, and the base 113 is provided with a shaft connection portion 115; and, a channel 116 and a guide portion 117 are formed between the air inlet 111 and the air outlet 112 of the fan frame 11, The channel 116 is adjacent to the air inlet 111 , and the air guiding portion 117 is adjacent to the air outlet 112 . The channel 116 and the air guiding portion 117 form a turning portion C where the inner peripheral wall of the fan frame 11 is adjacent to each other.

The fan wheel 12 has a hub 121 , and a plurality of blades 122 are disposed on the outer surface of the hub 121 ; wherein the hub 121 of the fan wheel 12 is rotatably coupled with the shaft connection portion 115 of the base 113 .

The coil assembly 13 is disposed inside the base 113 of the fan frame 11 to drive the fan wheel 12 to rotate.

Please refer to FIG. 4, the main technical feature of the cooling fan 1a of the first embodiment of the present invention is that: the fan wheel 12 defines a central axis L, and the air guide part 117 of the fan frame 11 is based on the central axis L Radially outward expansion; wherein the fan wheel 12 defines a first reference plane S1 and a second reference plane S2, the first reference plane S1 passes through the top edge of the fan wheel 12 and is perpendicular to the central axis L, the second The two datum planes S2 pass through the bottom edge of the fan wheel 12 and are perpendicular to the central axis L; and the turning portion C where the channel 116 and the guide portion 117 are adjacent to each other is located on the first datum plane S1 and the second datum plane S1. Between datum plane S2.

With the help of the above technical features, it can be ensured that the turning portion C will not be too close to the air outlet 112. In other words, the height of the guide portion 117 in the axial direction will ensure that the fan wheel 12 can pass through the air inlet 111 when the airflow is introduced. After the channel 116 and into the process of the guide part 117, the guide part 117 can more effectively achieve the effect of guiding the airflow, and can also increase the air outlet area; moreover, the cooling fan 1a of the present utility model can Prevent the airflow from being excessively concentrated between the passage 116 and the fan wheel 12, so that the fan wheel 12 will not generate large wind shear noise during the process of guiding the airflow.

Please refer to FIG. 5 , the cooling fan 1 b of the second embodiment of the present invention also includes at least a fan frame 11 , a fan wheel 12 and a coil assembly 13 . The difference between the cooling fan 1b of the second embodiment of the present invention and the cooling fan 1a of the first embodiment is that: the fan wheel 12 further defines a first reference plane S1 and the second reference plane S2. Three reference planes (S3), the third reference plane S3 is perpendicular to the central axis L, and the distance from the third reference plane S3 to the first reference plane S1 is equal to the distance from the third reference plane S3 to the second reference plane S2 In this embodiment, the turning portion C where the channel 116 and the flow guiding portion 117 are adjacent to each other is located between the first reference plane S1 and the third reference plane S3.

With the above technical features, the axial height of the air guide portion 117 of the heat dissipation fan 1b of the second embodiment will be greater than the axial height of the air guide portion 117 of the heat dissipation fan 1a of the first embodiment, therefore, It can provide a better guiding airflow effect; however, in order to ensure that when the fan wheel 12 introduces the airflow into the passageway 116, the passageway 116 can still provide a predetermined pressure accumulation effect; therefore, this embodiment defines the turning part C There is a first axial distance d1 to the third reference plane S3, a second axial distance d2 from the third reference plane S3 to the first reference plane S1, and the first axial distance d1 is less than or equal to the first axial distance d1 One-half of the axial distance d2 is used to prevent the turning portion C from being too close to the air inlet 111 , thereby affecting the pressure storage effect of the channel 116 .

Please refer to FIG. 6 , the cooling fan 1 c of the third embodiment of the present invention also includes at least a fan frame 11 , a fan wheel 12 and a coil assembly 13 . The difference between the cooling fan 1c of the third embodiment of the present invention and the cooling fan 1a of the first embodiment is that: the fan wheel 12 also defines a third reference plane S3, the third reference plane S3 is perpendicular to the central axis L, And the distance from the third reference plane S3 to the first reference plane S1 is equal to the distance from the third reference plane S3 to the second reference plane S2; in this embodiment, the channel 116 and the guide portion 117 are adjacent to each other The turning part C of is located on the third reference plane S3.

With the above technical features, compared with the cooling fan 1a of the first embodiment, since the turning portion C of the cooling fan 1c of the third embodiment is just located on the third reference plane S3; therefore, when the fan wheel 12 introduces airflow After entering the channel 116 through the air inlet 111, the pressure accumulation effect provided by the channel 116, and the flow guide effect provided by the guide part 117 after the fan wheel 12 guides the airflow into the guide part 117, both The latter will be relatively balanced to avoid the generation of turbulent flow and improve the cooling effect of the cooling fan 1c.

Also, please refer to Fig. 4, 5, and 6, the air inlet 111 of the cooling fan 1a, 1b, 1c of the present utility model has a maximum diameter D1, and the air outlet 112 also has a maximum diameter D2; based on the above-mentioned utility model Under the technical concept that the turning portion C is located between the first reference plane S1 and the second reference plane S2, the ratio of the maximum diameter D2 of the air outlet 112 to the maximum diameter D1 of the air inlet 111 may be 1.2-1.9, Preferably, it is 1.7, whereby the overall air outlet area can be increased more effectively.

From the above, it can be seen that the cooling fans 1a, 1b, and 1c of the utility model can indeed achieve the effect of improving the flow guide of the air outlet 112 and effectively reducing the wind shear noise, so as to provide a cooling fan structure with more complete functions.

Claims (6)

1. radiation fan is characterized in that comprising:

A fan frame has a wind inlet and an exhaust outlet, forms a passage and a diversion division between this wind inlet and this exhaust outlet, and this passage and this diversion division form a turning point in the adjoining mutually position of the inboard perisporium of this fan frame;

An impeller is incorporated into this fan frame inside; And

A coil groups is arranged at this fan frame inside;

Wherein this impeller defines a central axis, the diversion division of this fan frame is the expansion of benchmark radially outward with this central axis, this impeller definition in addition has first reference level and second reference level, this first reference level is by the apical margin of this impeller and perpendicular to this central axis, this second reference level passes through the root edge of this impeller and perpendicular to this central axis, this turning point is between this first reference level and this second reference level.

2. radiation fan as claimed in claim 1, it is characterized in that: this impeller defines one the 3rd reference level in addition, the 3rd reference level is between this first reference level and this second reference level, the 3rd reference level is perpendicular to this central axis, and the 3rd reference level equals the distance of the 3rd reference level to this second reference level to the distance of this first reference level, and this turning point is between this first reference level and the 3rd reference level.

3. radiation fan as claimed in claim 2, it is characterized in that: this turning point to the 3rd reference level has one first axial distance, the 3rd reference level to this first reference level has one second axial distance, and this first axial distance is less than or equal to 1/2nd of this second axial distance.

4. radiation fan as claimed in claim 1, it is characterized in that: this impeller defines one the 3rd reference level in addition, the 3rd reference level is between this first reference level and this second reference level, the 3rd reference level is perpendicular to this central axis, and the 3rd reference level equals the distance of the 3rd reference level to this second reference level to the distance of this first reference level, and this turning point is positioned at the 3rd reference level.

5. as claim 1,2,3 or 4 described radiation fans, it is characterized in that: this wind inlet and this exhaust outlet have maximum caliber respectively, and the maximum caliber of this exhaust outlet is 1.2～1.9 with respect to the ratio of the maximum caliber of this wind inlet.

6. radiation fan as claimed in claim 5 is characterized in that: the maximum caliber of this exhaust outlet is 1.7 with respect to the ratio of the maximum caliber of this wind inlet.

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