CN117231551A - Centrifugal radiator fan - Google Patents

Abstract

The invention provides a centrifugal cooling fan, which comprises a hub, a wheel frame and a fan blade set. The fan blade group surrounds the hub and keeps a distance from the hub along the radial direction. The wheel carrier is connected between the wheel hub and the fan blade group, wherein the wheel carrier and a plurality of fan blades of the fan blade group are combined together by heterogeneous materials.

Description

Centrifugal radiator fan

Technical Field

The present disclosure relates to heat dissipation fans, and particularly to a centrifugal heat dissipation fan.

Background

Since the design trend of portable electronic devices (such as notebook computers or tablet computers) is gradually towards thinning, under the circumstance that the internal space is very limited, the heat dissipation fan installed therein is required to be thinned as a target, and therefore, under the circumstance that the space is limited, the air flow of the heat dissipation fan cannot smoothly enter and exit the heat dissipation fan, and the heat dissipation efficiency is affected.

Taking a centrifugal heat dissipation fan as an example, existing fan blades are made of metal materials, and compared with fan blades made of plastic materials through injection molding, the metal materials can actually obtain thinner fan blade structures so as to obtain more air quantity and stronger air pressure.

However, the existing metal fan blade is also subjected to: as the number of blades increases, the junction between the blades and the hub increases, thereby impeding the air flow of the centrifugal radiator fan at the suction position. Meanwhile, the metal fan blades are not capable of being thinned and increased in number without limitation, and once the thickness of the metal fan blades is smaller than a specific thickness, the metal fan blades deform, so that the metal fan blades are unfavorable for air flow and are easy to generate noise. Similarly, when the number of blades exceeds a certain number, assembly or manufacturing difficulties are faced.

Therefore, how to change the related structure of the conventional centrifugal heat dissipation fan to cope with the above-mentioned problems is a matter that the related art needs to think.

Disclosure of Invention

The invention is directed to a centrifugal heat dissipation fan, which provides a fan blade set which keeps a distance from a hub at the periphery of the hub, and takes a wheel frame as bridging to enhance heat dissipation efficiency.

According to an embodiment of the invention, a centrifugal heat dissipation fan comprises a hub, a wheel frame and a fan blade set. The fan blade group surrounds the hub and keeps a distance from the hub along the radial direction. The wheel carrier is connected between the wheel hub and the fan blade group, wherein the wheel carrier and a plurality of fan blades of the fan blade group are combined together by heterogeneous materials.

Based on the above, in the above embodiment of the present invention, the centrifugal heat dissipation fan is provided with a vane blade (blade) feature far from the hub by combining the wheel frame and the plurality of blades of the blade group together by heterogeneous materials, that is, the thickness of the blades can be further reduced under the structural support of the wheel frame, and meanwhile, the number of the blades can be relatively increased, and the air flow pressure at the air exhaust position of the centrifugal fan can be increased, so that the heat dissipation efficiency is improved.

Drawings

FIG. 1 is a schematic diagram of a centrifugal radiator fan according to an embodiment of the invention;

FIG. 2 is a top view of a portion of the components of the centrifugal radiator fan of FIG. 1;

FIG. 3 is a partial cross-sectional view of the centrifugal radiator fan of FIG. 1;

FIG. 4 is a partial schematic view of a centrifugal radiator fan according to another embodiment of the invention;

FIG. 5 is a schematic view of an outer layer fan blade according to another embodiment of the present invention;

fig. 6 is a schematic view of a centrifugal radiator fan according to another embodiment of the invention;

fig. 7 is a top view of the centrifugal radiator fan of fig. 6;

fig. 8 is a cross-sectional view of the centrifugal radiator fan of fig. 6;

fig. 9 is a schematic diagram showing the combination of related components of the centrifugal heat dissipation fan of the present invention.

Detailed Description

Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.

Fig. 1 is a schematic view of a centrifugal heat dissipation fan according to an embodiment of the invention. Fig. 2 is a plan view of a part of the components of the centrifugal radiator fan of fig. 1. Fig. 3 is a partial cross-sectional view of the centrifugal radiator fan of fig. 1. Referring to fig. 1 to 3, in the present embodiment, the centrifugal heat dissipation fan 100 includes a hub 130, a fan blade set 110, a fan blade set 120, a wheel frame 140, and a housing 150, wherein the hub 130, the fan blade set 110, the fan blade set 120, and the wheel frame 140 are disposed in the housing 150 and rotate along an axial direction X1, and the housing 150 has two air inlets 151 and 152 located in the axial direction X1 and at least one air outlet located in a radial direction X2 (two air outlets 153 and 154 are illustrated in the present embodiment as an example). When the centrifugal heat dissipation fan 100 is operated, the air flow is suitable for entering the housing 150 from the air inlets 151 and 152, and flows out of the housing 150 from the air outlets 153 and 154.

More importantly, the double-layer fan blade sets (fan blade sets 110 and 120) of the present embodiment are formed to surround the hub 130 with an inner layer and an outer layer along the radial direction X2, wherein a gap G1 is maintained between the inner layer fan blade set 110 and the outer layer fan blade set 120 along the radial direction X2, and the wheel frame 140 connects the hub 130 and the outer layer fan blade set 120. Furthermore, the inner blade set 110 is directly coupled to the hub 130, and the outer blade set 120 is indirectly coupled to the hub 130 via the wheel frame 140. In short, the inner blade set 110 is characterized by the wave blade, and the outer blade set 120 is characterized by the vane, wherein the greatest difference is whether the blades are directly connected to the valleys 130.

The fan blade set 110 and the hub 130 are made of heterogeneous materials, for example, metal fan blades are combined with the hub 130 made of plastic material through embedding and injection, plastic fan blades are integrally formed with the hub 130, or metal fan blades are combined with the hub 130 made of metal through casting. In this way, the fan blade set 110 directly combined with the hub 130 is located in the axial direction X1 corresponding to the air inlets 151 and 152, and is used as a main structure for guiding the air of the external environment into the housing 150 when the centrifugal heat dissipation fan 100 is operated, and the wave blade structure is adopted to improve the flow rate and smoothness of the air flowing into the housing 150. In another embodiment, the fan blade set and the hub (or the wheel frame) may be made by plastic integrally molding, or made of plastic and combined with the metal (plate metal or die-cast) fan blade, or made of metal (die-cast) hub and the metal (plate metal) fan blade. For example, the blade set is stainless steel (SUS 304), and the wheel frame is die-cast aluminum alloy (ADC 6); or the blade set is stainless steel (SUS 304), and the wheel frame is plastic (liquid crystal plastic liquid crystal polymer, LCP).

Further, as shown in fig. 3, among the plurality of blades of the inner blade set 110, each blade has an arc-shaped side edge A2, A4, and the notches of the arc-shaped side edges A2, A4 face the air inlet 151 (axial direction X1) and the air outlets 153, 154 (radial direction X2, shown in fig. 1) to guide the air flow flowing from the air inlets 151, 152 into the centrifugal radiator fan 100 to the outer blade set 120.

As shown in fig. 3, each fan blade of the fan blade set 110 has a top edge A1 corresponding to the air inlet 151, a bottom edge A5 corresponding to the air inlet 152, and a side edge A3 corresponding to the air outlet 153 or 154 (radial X2), wherein the curved side edge A2 is adjacent between the top edge A1 and the side edge A3, and the curved side edge A4 is adjacent between the bottom edge A5 and the side edge A3, wherein the top edge A1 has a radial dimension L1, the bottom edge A5 has a radial dimension L2, and the side edge A3 has a radial dimension L1a, the radial dimension L1 is smaller than the radial dimension L1a, and the radial dimension L2 is smaller than the radial dimension L1a. Therefore, the radial dimension of each fan blade of the fan blade set 110 increases from the air inlets 151, 152 (axial direction X1) toward the air outlets 153, 154 (radial direction X2), so as to provide the above-mentioned air flow guiding effect.

Here, regarding each fan blade of the fan blade set 110, on the premise that the rotation speed of the hub 130 is fixed, each fan blade of the fan blade set 110 has a larger tangential velocity at the side edge A3, and the top edge A1 or the bottom edge A5 has a smaller tangential velocity due to the above-mentioned size limitation and the arc-shaped side edges A2 and A4. In this way, the area with the fast tangential velocity represents the existence of smaller air pressure, so that the fan blades of the fan blade set 110 can smoothly guide the air flow into the fan blade set 110 and increase the capability of sucking the outside air through the divergent design of the radial dimension of the fan blade set.

In contrast, among the plurality of blades of the outer blade set 120, each blade has an arc-shaped side edge B2, B4, and the notches of the arc-shaped side edges B2, B4 face the air inlets 151, 152 (the axial direction X1) and the hub 130, and are opposite to the arc-shaped side edges A2, A4 of the blade set 110, so that the outer blade set 120 can smoothly receive the air flow led out from the blade set 110. Furthermore, as shown in fig. 3, the arc-shaped side edges A2, A4, B2, B4 of the present embodiment have different radians, which also represents that the air inlets 151, 152 of the housing 150 can be designed with different sizes or shapes.

Referring to fig. 2 and 3 again, in the present embodiment, the wheel frame 140 includes a first coupling portion 141, a connecting portion 142 and a second coupling portion 143, the first coupling portion 141 is coupled to the hub 130, the second coupling portion 143 is coupled to the fan blade set 120 located on the outer layer, and the connecting portion 142 is connected between the first coupling portion 141 and the second coupling portion 143. Here, part of the blades of the inner blade set 110 are also coupled to the connection portion 142. Because the fan blade set 120 uses the wheel frame 140 as the combination and supporting structure between the wheel frame and the hub 130, the fan blade set 120 has the vane characteristics obviously, that is, uses the wheel frame 140 as the bearing substrate, unlike the fan blade set 110, so that the thickness of each fan blade of the fan blade set 120 can be further thinned without worrying about the influence of insufficient structural strength. This corresponds to the number of blades of the blade group 120 that can be increased accordingly, and there is no need to worry about the aforementioned problem of difficult assembly. For example, the thickness of each blade of the outer blade set 120 may be less than or equal to 0.08mm, and there is no concern about insufficient rigidity of the blades due to the presence of the second bonding portion 143.

In short, the outer blade set 120 may be made of a metal material, so that the number of blades of the inner blade set 110 is smaller than or equal to the number of blades of the outer blade set 120, and the thickness of the outer blade set 120 is smaller than the thickness of the inner blade set 110. In this way, the light and thin fan blade structure and the increased number of fan blades can make the fan blade set 120 located on the outer layer effectively increase the airflow rate and the airflow pressure. In addition, the designer can properly adjust the noise generated by the centrifugal heat dissipation fan 100 during operation by properly adjusting the number of the inner fan blade set 110 and the number of the outer fan blade set 120. In other words, the difference between the number of the blades of the double-layer fan blade sets 110 and 120 can prevent the centrifugal heat dissipation fan 100 from continuously generating high-frequency or low-frequency noise.

Referring to fig. 3 again, in the present embodiment, each fan blade of the fan blade set 120 further has a top edge B1, a bottom edge B5, an inner edge B3 and an outer edge B6, wherein the inner edge B3 is opposite to the side edge A3 of the fan blade set 110 and maintains a gap G1, the top edge B1 corresponds to the air inlet 151, the bottom edge B5 corresponds to the air inlet 152, and the outer edge B6 corresponds to the air outlets 153, 154. The blades of the blade set 120 further have a plurality of notches at the outer edge B6, which are used to increase turbulence generated when the airflow increases and is discharged from the air outlets 153 and 154, so as to reduce noise generated at the air outlets 153 and 154.

Fig. 4 is a partial schematic view of a centrifugal heat dissipation fan according to another embodiment of the present invention, showing a part of the centrifugal heat dissipation fan in a side view. Referring to fig. 4, in the present embodiment, unlike the pair of arc-shaped side edges in the previous embodiment, each blade of the blade set 110A of the present embodiment only has an arc-shaped side edge a21 facing the air inlet 151 (axial direction X1) and the air outlets 154, 154 (radial direction X2), and the blade set 120A also only has an arc-shaped side edge B21 facing the air inlet 151 (axial direction X1) and the air outlets 153, 154 (radial direction X2). Except for the fact that the radial dimension of the fan blade set 110 is gradually increased from the air inlet 151 (the axial direction X1) toward the air outlets 154, 154 (the radial direction X2), so that the air flow can be smoothly guided from the air inlet 151 to the fan blade set 120A. Here, the radial dimension of blade group 110A at its top edge a11 is smaller than the radial dimension at its bottom edge a 51.

FIG. 5 is a schematic view of an outer blade according to another embodiment of the present invention. Referring to fig. 5 and fig. 3, unlike the above embodiment having the notch structure only at the outer edge B6, the blades of the blade set 120B of the present embodiment have the notch structures at both the inner edge B61 and the outer edge B62, and in the present embodiment, the number of notches at the outer edge B62 is greater than the number of notches at the inner edge B61.

Referring to fig. 3 again, in the present embodiment, the wheel frame 140 and the outer blade set 120 are made of heterogeneous materials, i.e. the blades of the outer blade set 120 are made of metal materials and are combined with the wheel frame 140 by embedding and injecting, wherein part of the blades of the inner blade set 110 can also be combined with the connecting portion 142 or the first combining portion 141 of the wheel frame 140. Here, the second coupling portion 143 is substantially coupled to the center of the blades of the blade set 120, and particularly corresponds to the notch of the inner edge B3. Next, referring to fig. 4, the wheel frame 140A of the present embodiment includes a first coupling portion 141A, a second coupling portion 143A and a connecting portion 142A, and unlike the previous embodiment, the wheel frame 140A is located opposite to the air inlet 151, so that the first coupling portion 141A is coupled to the bottom of the hub 130, and the second coupling portion 143A is coupled to the bottom of the blades of the blade set 120A to match the contour trend of the arc-shaped side edges a21 and B21.

Fig. 6 is a schematic view of a centrifugal radiator fan according to another embodiment of the invention. Fig. 7 is a top view of the centrifugal heat dissipation fan of fig. 6. Fig. 8 is a sectional view of the centrifugal radiator fan of fig. 6, which is produced along a sectional line A-A shown in fig. 7. Referring to fig. 6 to 8, the fan blade structure of the present embodiment is closer to that shown in fig. 4, that is, the wheel frame 140C includes a connecting portion 142C and a connecting portion 143C, and the wheel frame 140C is substantially integrally formed with the hub 130, so that the connecting portion 142C extends from the hub 130 along the radial direction X2 and is connected to the connecting portion 143C. The coupling portion 143C is, for example, a ring concentric with the hub 130 (with the rotation center, i.e., the axial direction X1), and is used to couple each blade of the blade group 120. More importantly, the fan blade set 120 of the present embodiment is the fan blade set 120 located at the outer layer in the previous embodiment, and the bonding portion 143C is bonded to the bottom of the fan blade set 120, so that each fan blade of the fan blade set 120 is used as a bonding and supporting structure through the bonding portion 143C.

Fig. 9 is a schematic diagram showing the combination of related components of the centrifugal heat dissipation fan of the present invention. Referring to FIG. 9, there is shown a possible junction C1-C7 of the wheel frame with the outer blade set 120, i.e., the wheel frame can be coupled to at least one of the junctions C1-C7. The area of the joint C1-C7 between the wheel frame and the fan blade is about 10% -20% of the whole area of the fan blade. That is, the wheel frame can be combined with the required position according to the requirement, and can also be combined with a plurality of combined positions C1-C7 at the same time, and on the premise that the fan blade set 120 can take the wheel frame as a supporting structure and ensure the structural strength of the fan blades, a designer can determine the positions of the combined positions C1-C7 according to the conditions (such as the shape, the size and the thickness) of the fan blades. The possible form of connection of the wheel carrier to the joint C1-C3 is only provided in fig. 9, but not limited thereto. It should be noted that, the more the areas of the joints C1-C7 occupy the blade, the stronger the binding force can be provided, but the capability of the blade to perform a function on air (capability of driving air, response to airflow rate and flow speed …, etc.) is reduced, so when the areas of the joints C1-C7 are larger than 20% of the areas of the blade, the capability of performing work on the blade is already significantly affected. Conversely, if the combined area is too small (less than 10%), the fan blades may not resist the centrifugal force generated during high-speed rotation and the reaction force generated during work on the air, and may be undesirably deformed or even damaged.

In summary, in the above embodiments of the present invention, the centrifugal heat dissipation fan is formed by radially arranging a double-layer fan blade set around the hub in an inner layer and an outer layer around the hub, and radially maintaining a gap between the inner layer fan blade set and the outer layer fan blade set, and connecting the hub and the outer layer fan blade set by a wheel frame. In this way, the double-layer fan blade set can form an inner layer fan blade set with wave blade (wave blade) characteristics and an outer layer fan blade set with blade (blade) characteristics, and the centrifugal heat dissipation fan can have the advantages of both the wave She Shanshe and the blade blades with the configuration.

That is, for the double-layer fan blade set, the fan blade set located at the inner layer is directly combined with the hub, so that the design logic of the existing metal fan blade can be maintained, that is, the smoothness of air flow flowing into the centrifugal cooling fan is maintained, and the effects of larger air flow and noise reduction are achieved. In addition, for the outer layer fan blade set, the wheel frame is used as a combining and supporting structure, and in particular, the metal fan blade is matched with plastic or metal heterogeneous material combining means, so that the structural strength of the outer layer fan blade set can be effectively improved, a designer can further reduce the thickness of the outer layer fan blade set, the number of the outer layer fan blade set is increased, and the centrifugal fan can also improve the air flow pressure at the exhaust position of the centrifugal fan, so that the heat dissipation benefit is improved. Meanwhile, the number of the outer layer fan blade sets can also be adjusted and designed according to the number of the inner layer fan blade sets, so that noise control is facilitated.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (10)

1. A centrifugal radiator fan, comprising:

a hub;

a wheel carrier; and

the fan blade group surrounds the outside of the hub and keeps a distance from the hub along the radial direction, the wheel frame is connected between the hub and the fan blade group, and the wheel frame and a plurality of fan blades of the fan blade group are combined together by heterogeneous materials.

2. The centrifugal fan according to claim 1, wherein the plurality of blades of the blade group are made of metal, and the wheel frame is made of plastic.

3. The centrifugal fan according to claim 1, wherein the plurality of blades of the blade group and the wheel frame are die-cast together with different kinds of metals.

4. The centrifugal fan according to claim 1, wherein at least one joint is formed between the wheel frame and each of the blades of the blade group, and the area of the joint is 10% -20% of the surface area of each of the blades.

5. The centrifugal fan according to claim 1, wherein a plurality of junctions exist between the wheel frame and each of the blades of the blade group, and the sum of the areas of the junctions is 10% -20% of the surface area of each of the blades.

6. A centrifugal fan according to claim 1, wherein the wheel frame and the hub are of an integrally formed structure.

7. The centrifugal fan according to claim 1, wherein the wheel frame has a rim concentric with the hub, the plurality of blades of the blade group being coupled to the rim.

8. The centrifugal fan of claim 1, wherein each of the blades of the set of blades has an outer rim facing away from the hub, and at least one notch feature located on the outer rim.

9. The centrifugal fan according to claim 1, wherein a thickness of each of the blades of the blade group is less than or equal to 0.08mm.

10. The centrifugal fan according to claim 1, further comprising another fan blade group circumferentially provided to the hub, wherein the other fan blade group and the fan blade group are disposed in an inner layer and an outer layer with respect to the hub in the radial direction.