TW202342885A - Centrifugal heat dissipation fan - Google Patents

Abstract

A centrifugal heat dissipation fan including a hub, a frame, and a blade set is provided. The blade set surrounds the hub and keeps a distance from the hub in radial direction. The frame is connected between the hub and the blade set, wherein a plurality of blades of the blade set and the frame are combined with each other by heterogeneous materials.

Description

Centrifugal cooling fan

The present invention relates to a cooling fan, and in particular to a centrifugal cooling fan.

As the design trend of portable electronic devices (such as laptops or tablets) gradually moves towards thinner and lighter weights, the cooling fans installed in them are also required to be thinner when the internal space is extremely limited. , which in turn causes the airflow of the cooling fan to not flow in and out of the cooling fan smoothly when the space is limited, thus affecting its heat dissipation efficiency.

Take centrifugal cooling fans as an example. Currently, fan blades are made of metal materials. Compared with fan blades made of injection molding of plastic materials, metal materials can indeed achieve a thinner fan blade structure to obtain More air volume and stronger wind pressure.

However, existing metal fan blades are also faced with the following problem: as the number of fan blades increases, the joint between them and the hub also expands, thereby hindering the air flow of the centrifugal cooling fan at its suction point. At the same time, metal fan blades cannot be thinned and the number of fan blades can be increased without limit, because once it reaches a certain thickness, the metal fan blades will deform, which is not conducive to air flow and is prone to noise. Similarly, when the number of fan blades exceeds a certain number, assembly or manufacturing difficulties will arise.

Therefore, how to change the related structure of the existing centrifugal cooling fan to cope with the above-mentioned problems is actually a topic that relevant technical personnel need to consider.

The present invention provides a centrifugal cooling fan, which provides a fan blade set at a distance from the wheel hub on the periphery of the wheel hub, and uses the wheel frame as a bridge to increase heat dissipation performance.

The centrifugal cooling fan of the present invention includes a hub, a wheel frame and a fan blade assembly. The fan blade group surrounds the hub and maintains a radial distance from the hub. The wheel frame is connected between the hub and the fan blade set, wherein the wheel frame and the multiple blades of the fan blade set are combined with heterogeneous materials.

Based on the above, in the above embodiments of the present invention, the centrifugal cooling fan uses the wheel frame and the plurality of blades of the fan blade set to be combined with heterogeneous materials, so that the centrifugal cooling fan has a wheel away from the hub. The wheel blade feature, that is, under the structural support of the wheel frame, can further reduce the thickness of these fan blades, and can also relatively increase the number of fan blades, and also enable the centrifugal fan to improve its exhaust air airflow pressure to improve heat dissipation efficiency.

FIG. 1 is a schematic diagram of a centrifugal cooling fan according to an embodiment of the present invention. FIG. 2 is a top view of some components of the centrifugal cooling fan of FIG. 1 . FIG. 3 is a partial cross-sectional view of the centrifugal cooling fan of FIG. 1 . Please refer to FIGS. 1 to 3 at the same time. In this embodiment, the centrifugal cooling fan 100 includes a hub 130 , a blade set 110 and a blade set 120 , a wheel frame 140 and a housing 150 . The hub 130 , the blade set 110 The fan blade set 120 and the wheel frame 140 are arranged inside the housing 150 and rotate along the axial direction X1. At the same time, the housing 150 has two air inlets 151, 152 located in the axial direction One air outlet (this embodiment shows two air outlets 153 and 154 as an example). When the centrifugal cooling fan 100 is running, the airflow is adapted to enter the housing 150 from the air inlets 151 and 152 and flow out of the housing 150 from the air outlets 153 and 154.

More importantly, the double-layer fan blade set (blade set 110, 120) of this embodiment is formed as an inner layer and an outer layer surrounding the hub 130 along the radial direction A gap G1 is maintained between the outer fan blade groups 120 along the radial direction X2, and the wheel frame 140 connects the hub 130 and the outer fan blade group 120. Furthermore, the fan blade set 110 located on the inner layer is directly structurally coupled to the hub 130 , while the fan blade set 120 located on the outer layer is indirectly coupled to the hub 130 via the wheel frame 140 . In short, the fan blade group 110 located in the inner layer has the characteristics of wave blades, while the fan blade group 120 located in the outer layer has the characteristics of wheel blades. The biggest difference between the two is whether the fan blades are directly connected to the wheel valley 130. .

The fan blade set 110 and the hub 130 are combined with heterogeneous materials. For example, the metal fan blades are combined with the plastic hub 130 through embedded injection. They can also be plastic fan blades that are integrally formed with the hub 130, or The metal fan blades are combined with the metal hub 130 by casting means. In this way, the fan blade set 110 directly structurally coupled with the hub 130 is located in the axial direction X1 corresponding to the air inlets 151 and 152, and is used to introduce the air from the external environment into the housing when the centrifugal cooling fan 100 is operating. The main structure within the housing 150 adopts a wave blade structure because it can improve the flow and smoothness of the airflow into the housing 150. In another embodiment not shown, the fan blade set and the hub (or wheel frame) can also be made by integrally molding plastic, or the hub can be made of plastic and made of metal (sheet metal or die-casting). ) fan blades are combined with each other, or a metal (made of die-casting) hub and metal (made of sheet metal) fan blades are combined with each other. For example, the fan blade set is made of stainless steel (SUS304), and the wheel frame is made of die-cast aluminum alloy (ADC6); or the fan blade set is made of stainless steel (SUS304), and the wheel frame is made of plastic (liquid crystal polymer, LCP).

Furthermore, as shown in FIG. 3 , among the multiple blades of the inner blade group 110 , each blade has arc-shaped side edges A2 and A4 , and the notches of the arc-shaped side edges A2 and A4 face toward The air inlet 151 (axial direction Group 120.

As shown in Figure 3, each fan blade of the fan blade group 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 direction X2), and The aforementioned arc-shaped side edge A2 is adjacent between the top edge A1 and the side edge A3, and the aforementioned arc-shaped side edge A4 is adjacent between the bottom edge A5 and the side edge A3. The top edge A1 has a radial dimension L1, and the bottom edge A5 has a radial dimension L1. 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 size of each fan blade of the fan blade set 110 gradually increases from the air inlets 151 and 152 (axial direction X1) toward the air outlets 153 and 154 (radial direction X2), thereby providing the above-mentioned airflow guidance. Effect.

Here, looking at each blade of the fan blade set 110, under the premise that the rotation speed of the hub 130 is fixed, each blade of the fan blade set 110 will have a larger tangential speed at the side edge A3, and the top edge A1 Or the bottom edge A5 has a smaller tangential speed due to the aforementioned size restrictions and the arc-shaped side edges A2 and A4. In this way, the area with fast tangential speed represents the existence of smaller airflow pressure. Therefore, through the gradually expanding design of each fan blade of the fan blade set 110, the airflow can be smoothly introduced into the fan blade set 110. In addition, it can also increase the ability to absorb outside air.

Correspondingly, among the multiple blades of the outer fan blade group 120 , each blade has arc-shaped side edges B2 and B4 , and the notches of the arc-shaped side edges B2 and B4 are directed toward the air inlets 151 and 152 (axial direction). ( Airflow. Furthermore, as shown in FIG. 3 , the curvatures of the arc-shaped side edges A2, A4, B2, and B4 of this embodiment are different, which also means that the air inlets 151 and 152 of the housing 150 can also adopt different sizes or shapes. design.

Please refer to Figures 2 and 3 again. In this embodiment, the wheel frame 140 includes a first coupling part 141, a connecting part 142 and a second coupling part 143. The first coupling part 141 is coupled to the wheel hub 130, and the second coupling part 143 Combined to the fan blade group 120 located on the outer layer, the connection part 142 is connected between the first connection part 141 and the second connection part 143 . Here, some of the blades of the blade set 110 located on the inner layer are also coupled to the connecting portion 142 . Precisely because the fan blade set 120 uses the wheel frame 140 as the combination and support structure between it and the hub 130, it is different from the fan blade set 110. The fan blade set 120 obviously has the characteristics of a wheel blade, that is, the wheel frame 140 is used as a Because of its load-bearing base, the thickness of each blade of the fan blade set 120 can be further reduced without worrying about the impact of insufficient structural strength. This is also equivalent to increasing the number of fan blades in the fan blade set 120 without having to worry about the aforementioned difficulty in assembly. For example, the thickness of each blade of the outer blade set 120 can be less than or equal to 0.08 mm, and due to the existence of the second joint portion 143, there is no need to worry about insufficient rigidity of the blades.

In short, the outer fan blade set 120 can be made of metal, so that the number of fan blades of the inner fan blade set 110 is less than or equal to the number of fan blades of the outer fan blade set 120 , and so that The fan blade thickness of the fan blade group 120 located on the outer layer is smaller than the fan blade thickness of the fan blade group 110 located on the inner layer. In this way, the lighter and thinner fan blade structure and the increase in the number of fan blades can effectively increase the air flow rate and air flow pressure of the outer fan blade group 120 . In addition, the designer can also appropriately adjust the noise generated by the centrifugal cooling fan 100 during operation by appropriately adjusting the number of blades of the inner blade set 110 and the number of blades of the outer blade set 120 . In other words, the difference in the number of blades of the double-layer fan blade sets 110 and 120 can be used to prevent the centrifugal cooling fan 100 from continuously generating high-frequency or low-frequency noise.

Please refer to FIG. 3 again. In this embodiment, each fan blade of the fan blade set 120 also has a top edge B1, a bottom edge B5, an inner edge B3, and an outer edge B6. The inner edge B3 and the fan blades of the fan blade set 110 The side edge A3 faces and maintains the 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 is used to correspond to the air outlets 153 and 154. Here, each fan blade of the fan blade set 120 also has a plurality of cutout structures located on the outer edge B6, which are used to increase the airflow and increase the generation of turbulence when it is discharged from the air outlets 153 and 154, so as to reduce the airflow between the air outlets 153 and 154. 154 noise generated.

4 is a partial schematic diagram of a centrifugal cooling fan according to another embodiment of the present invention, showing part of the centrifugal cooling fan from a side perspective. Please refer to Figure 4. In this embodiment, different from the pair of arc-shaped side edges in the previous embodiment, each blade of the fan blade set 110A in this embodiment only has an angle and a direction facing the air inlet 151 (axial direction X1). The arc-shaped side edges A21 of the air outlets 154 and 154 (radial direction X2), and the fan blade assembly 120A also only has arc-shaped sides facing the air inlet 151 (axial direction Edge B21. What remains unchanged is that the radial size of the fan blade assembly 110 still gradually increases from the air inlet 151 (axial direction X1) to the air outlets 154 and 154 (radial direction 151 is guided to the fan blade group 120A. Here, the radial size of the fan blade group 110A at its top edge A11 is smaller than the radial size at its bottom edge A51.

Figure 5 is a schematic diagram of an outer fan blade according to another embodiment of the present invention. Please refer to Figure 5 and compare with Figure 3. Different from the previous embodiment that only has a cutout structure on the outer edge B6, the fan blades of the fan blade set 120B of this embodiment have a cutout structure on both the inner edge B61 and the outer edge B62. In this embodiment, the number of incisions at the outer edge B62 is greater than the number of incisions at the inner edge B61.

Please refer to FIG. 3 again. In this embodiment, the wheel frame 140 and the outer fan blade set 120 are combined with heterogeneous materials. That is, the blades of the fan blade set 120 are made of metal and are embedded and ejected. Combined with the wheel frame 140 , some of the blades of the inner blade set 110 can also be combined with the connecting part 142 or the first combining part 141 of the wheel frame 140 . Here, the second coupling portion 143 is substantially coupled to the center of the blades of the blade group 120 , and particularly corresponds to the notch of the inner edge B3. Next, please refer to FIG. 4 . The wheel frame 140A of this embodiment also includes a first coupling part 141A, a second coupling part 143A and a connecting part 142A. What is different from the previous embodiment is that the wheel frame 140A is located at the air inlet 151 Oppositely, 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 fan blade set 120A to match the contour trend of the arcuate side edges A21 and B21 .

FIG. 6 is a schematic diagram of a centrifugal cooling fan according to another embodiment of the present invention. FIG. 7 is a top view of the centrifugal cooling fan of FIG. 6 . FIG. 8 is a cross-sectional view of the centrifugal cooling fan of FIG. 6 , taken along the cross-section line A-A shown in FIG. 7 . Please refer to Figures 6 to 8. The fan blade structure of this embodiment is relatively close to that shown in Figure 4. That is, the wheel frame 140C includes a connecting portion 142C and a combining portion 143C, and the wheel frame 140C is essentially an integral structure 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 coupling portion 143C. The coupling part 143C is, for example, a wheel ring that is concentric with the hub 130 (coincident with the rotation center, that is, the axial direction X1 ), and is used to couple each blade of the blade set 120 . More importantly, the fan blade set 120 of this embodiment is the outer fan blade set 120 of the previous embodiment, and the coupling portion 143C is combined with the bottom of the fan blade set 120 to allow each fan of the fan blade set 120 to The leaf passes through the coupling portion 143C as its coupling and supporting structure.

Figure 9 is a schematic diagram of the relevant components of the centrifugal cooling fan of the present invention. Please refer to FIG. 9 , which illustrates possible joints C1 to C7 between the wheel frame and the outer fan blade set 120 , that is, the wheel frame can be coupled to at least one of the joints C1 to C7 . The areas C1 to C7 at the joint between the wheel frame and the fan blade are approximately 10% to 20% of the overall area of the fan blade. That is to say, the wheel frame can be combined at the required position according to the demand, and can also be combined to a plurality of joints C1 to C7 at the same time. The fan blade group 120 can use the wheel frame as its supporting structure and ensure the structural strength of the fan blades. Under this premise, the designer can determine the location of the aforementioned joints C1 to C7 based on the conditions of the fan blade (such as appearance, size and thickness). Figure 9 only provides possible forms of connecting the wheel frame to the joints C1 to C3, but is not limited thereto. It should be noted that the more these joints C1 to C7 occupy the surface area of the fan blade, the stronger the binding force will be, but the ability of the fan blade to operate on the air will be reduced (the ability to drive air, which is reflected in the air flow rate and flow rate... etc. ), so when the area of the joint C1 ~ C7 is greater than 20% of the fan blade area, it will already begin to significantly affect the fan blade's ability to perform work. On the other hand, if the combined area is too small (less than 10%), the fan blades will be unable to resist the centrifugal force generated during high-speed rotation and the reaction force when working on the air, resulting in unexpected deformation or even damage.

To sum up, in the above-mentioned embodiments of the present invention, the centrifugal cooling fan is provided with a double-layer fan blade group in the inner layer and an outer layer surrounding the wheel hub in the radial direction, and the fan blades located in the inner layer are A gap is maintained along the radial direction between the blade set and the outer fan blade set, and a wheel frame is used to connect the hub and the outer fan blade set. In this way, the aforementioned double-layer fan blade group can form an inner fan blade group with wave blade characteristics and an outer fan blade group with wheel blade characteristics, and the above configuration allows the centrifugal The cooling fan can combine the advantages of wave blades and wheel blades.

In other words, for a double-layer fan blade set, since the inner fan blade set is directly combined with the hub, the design logic of the existing metal fan blades can be maintained, that is, the smoothness of the airflow into the centrifugal cooling fan can be maintained. , with the effect of larger air flow and noise reduction. Furthermore, for the outer fan blade set, because there is a wheel frame as a combination and support structure, and especially the heterogeneous material combination method of metal fan blades with plastic or metal can effectively improve the performance of the outer fan blade set. The structural strength of the centrifugal fan allows designers to further reduce the thickness of the outer fan blades. This is equivalent to increasing the number of blades in the outer fan blades, and also enables the centrifugal fan to increase the airflow at its exhaust area. pressure to improve heat dissipation efficiency. At the same time, the number of fan blades in the outer fan blade set can also be designed according to the number of fan blades in the inner fan blade set to facilitate noise control.

100:Centrifugal cooling fan 110, 120, 110A, 120A: Fan blade group 130:wheel hub 140, 140A, 140C: wheel frame 141, 141A: First joint part 142, 142A, 142C: Connection part 143, 143A: Second joint part 143C:Combining part 150: Shell 151, 152: Air inlet 153, 154: Air outlet A1, B1, A11: top edge A2, A4, B2, B4, A21, B21: curved side edges A3: Side edge A5, B5, A51: bottom edge B3, B61: inner edge B6, B62: outer edge C1～C7: junction G1: Gap L1, L2, L1a: radial size X1:Axis X2:radial

FIG. 1 is a schematic diagram of a centrifugal cooling fan according to an embodiment of the present invention. FIG. 2 is a top view of some components of the centrifugal cooling fan of FIG. 1 . FIG. 3 is a partial cross-sectional view of the centrifugal cooling fan of FIG. 1 . Figure 4 is a partial schematic diagram of a centrifugal cooling fan according to another embodiment of the present invention. Figure 5 is a schematic diagram of an outer fan blade according to another embodiment of the present invention. FIG. 6 is a schematic diagram of a centrifugal cooling fan according to another embodiment of the present invention. FIG. 7 is a top view of the centrifugal cooling fan of FIG. 6 . FIG. 8 is a cross-sectional view of the centrifugal cooling fan of FIG. 6 . Figure 9 is a schematic diagram of the relevant components of the centrifugal cooling fan of the present invention.

100:Centrifugal cooling fan

110, 120: Fan blade group

130:wheel hub

140:wheel stand

150: Shell

151:Air inlet

153, 154: Air outlet

G1: Gap

X1:Axis

X2:radial

Claims (10)

A centrifugal cooling fan, including: wheel hub; Wheel stand; and The fan blade set surrounds the hub and maintains a radial distance from the hub. The wheel frame is connected between the hub and the fan blade set, wherein the wheel frame and the plurality of fan blades of the fan blade set are in the order of Dissimilar materials are bonded together. The centrifugal cooling fan of claim 1, wherein the blades of the blade set are made of metal, and the wheel frame is made of plastic. The centrifugal cooling fan of claim 1, wherein the fan blades of the fan blade set and the wheel frame are die-cast together with different types of metals. The centrifugal cooling fan of claim 1, wherein there is at least one joint between the wheel frame and each fan blade of the fan blade group, and the area of the joint accounts for 10% to 20% of the surface area of each fan blade. %. The centrifugal cooling fan as claimed in claim 1, wherein there are multiple joints between the wheel frame and each fan blade of the fan blade group, and the sum of the areas of these joints accounts for 10% of the surface area of each fan blade. ~20%. The centrifugal cooling fan according to claim 1, wherein the wheel frame and the wheel hub are integrally formed structures. The centrifugal cooling fan of claim 1, wherein the wheel frame has a wheel ring concentric with the wheel hub, and the blades of the fan blade set are combined to the wheel ring. The centrifugal cooling fan according to claim 1, wherein each blade of the fan blade group has an outer edge away from the hub, and at least a cutout structure located on the outer edge. The centrifugal cooling fan according to claim 1, wherein the thickness of each blade of the blade group is less than or equal to 0.08mm. The centrifugal cooling fan according to claim 1, further comprising another fan blade group arranged around the hub, and in the radial direction, the other fan blade group and the fan blade group are in an inner layer relative to the hub. , outer configuration.

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