Impeller, fan and electronic device

Abstract

The impeller (10) has the advantages of increasing the number of blades with different lengths and inhibiting noise generation. The impeller (10) comprises a fan hub (11) and a plurality of independent blades arranged around the fan hub (11) in a ring array, the blades are arranged in an alternating manner, the blades extend outward along the radial direction of the impeller (10), the two ends of the blades are respectively a root and a tip, the root of the blade is connected to the side surface of the fan hub (11), the tips of the blades are located on the same circular line (01), and the lengths of two adjacent blades are different.

Description

Technical Field

[0001] This application relates to the field of heat dissipation equipment, and more particularly to impellers, fans and electronic devices. Background Technology

[0002] Many electronic devices are equipped with fans to dissipate heat from the heat-generating components. For some electronic devices, such as laptops and industrial equipment, when the temperature of heat-generating components (such as CPUs) increases, the cooling capacity of the fan must be improved accordingly, which also indirectly affects the increase in noise. Therefore, the requirements for the quietness performance of the fan are also higher.

[0003] The core component of a fan is the impeller, such as... Figure 4 As shown, the impeller includes a hub 07 and a plurality of blades 08 disposed on the hub 07. One end of the blades 08 is connected to the hub 07, and the other end extends radially outward. The blades 08 are evenly distributed, and the length of each blade 08 is equal. The width of the openings 09 formed between two pairs of blades 08 is basically equal. Each opening 09 emits air evenly, but this also causes the noise generated when the air is emitted to be superimposed, resulting in a large noise.

[0004] Furthermore, due to limitations in manufacturing processes, traditional blades are relatively thick, making it difficult to increase the number of blades. The more blades there are, the greater the airflow and the better the heat dissipation effect.

[0005] Therefore, there is an urgent need to provide an impeller, fan, and electronic equipment that can increase the number of blades and suppress noise generation to overcome the above-mentioned defects.

[0006] Application content

[0007] The purpose of this application is to provide an impeller that increases the number of blades of varying lengths and can suppress noise generation.

[0008] Another object of this application is to provide a fan that includes an impeller capable of increasing the number of blades of varying lengths and suppressing noise generation.

[0009] Another object of this application is to provide an electronic device that includes an impeller capable of increasing the number of blades of varying lengths and suppressing noise generation.

[0010] To achieve the above objectives, this application provides an impeller comprising a hub and a plurality of independent blades. The blades are arranged around the hub in a circular array, with staggered spacing between them. The blades extend radially outward from the hub, with a root and an end point at each end. The root of the blade is connected to the side of the hub, and the ends of the blades are all on the same circular line. The lengths of two adjacent blades are different.

[0011] Preferably, the blade and the end of the adjacent blade form a first outlet, and the blade and the end of another adjacent blade form a second outlet, with the opening widths of the first outlet and the second outlet being different.

[0012] Preferably, the blade includes a first structural portion extending in a first direction and a second structural portion extending from the end of the first structural portion in a second direction, wherein the first and second directions have different orientations.

[0013] Preferably, the length ratio of two adjacent blades is A:B, where A is 102-110 and B is 100.

[0014] Preferably, the width ratio of the first outlet to the second outlet is C:D, where C is 55-75 and D is 25-45.

[0015] Preferably, the thickness of the blade is in the range of 0.08-2.0 mm.

[0016] Preferably, one of the two adjacent blades is a straight blade or a curved blade, and the other of the two adjacent blades is a curved blade.

[0017] Preferably, the leaves of different lengths can be of two, three or more types.

[0018] Ideally, the number of leaves of different lengths should be the same.

[0019] Preferably, the impeller of this application also includes a ring, which is connected to the hub via blades and surrounds the hub. The blades are connected to the ring and disposed on one surface of the ring. The ring, hub and blades are integrally formed into a single structure.

[0020] Compared to existing technologies, where blades are all the same length and the outlet widths between them are roughly equal, resulting in consistent airflow velocity between adjacent blades, uniform radial airflow, and roughly equal airflow intensity at each outlet, this application addresses the issue. Because the first and second blades are not the same length, this disrupts the existing uniformity of radial airflow. The first outlet between the second blade and the preceding first blade is wide, while the second outlet between the second blade and the following first blade is narrow. The airflow velocity at the first outlet is relatively low, while the airflow velocity at the second outlet is relatively high. Consequently, the impeller velocity follows a "weak-strong-weak-strong..." distribution, disrupting the uniformity of airflow and causing variations in airflow velocity. Testing has shown that this effectively reduces the noise frequency generated during blade operation and suppresses noise. Therefore, by utilizing this characteristic, we reduced the blade thickness and added some blades of varying lengths. Compared to an impeller of the same size, the improved impeller has more blades, which weakens the uniformity of airflow between blades and generates more airflow during operation, meeting the increasingly high heat dissipation requirements of today's thin and light products. In contrast, the noise frequency of the improved impeller did not increase, achieving better results.

[0021] To achieve the other objective mentioned above, this application provides a fan including a motor and the aforementioned impeller. The motor includes a shaft, the impeller hub is mounted on the shaft, and the motor is used to drive the shaft to rotate.

[0022] To achieve another objective mentioned above, the device includes a heat-generating component and the aforementioned fan for dissipating heat from the heat-generating component. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the impeller structure according to the first embodiment of this application.

[0024] Figure 2 yes Figure 1 The diagram shown illustrates the impeller rotating.

[0025] Figure 3 This is a schematic diagram of the impeller rotating according to the second embodiment of this application.

[0026] Figure 4 This is a schematic diagram of the existing impeller rotating.

[0027] Figure 5 This is a schematic diagram of the structure of the impeller of this application when it is mounted on the magnetic assembly.

[0028] Figures 6 to 8 This is a schematic diagram of the impeller design process in this application.

[0029] Figure 9This is a comparison test diagram of the airflow velocity at the corresponding outlet of the impeller of this application and the existing general design impeller.

[0030] Figure 10 This is a comparison chart of the turbulent kinetic energy and surface pressure at corresponding positions on the blades of the impeller of this application and an existing general design impeller.

[0031] Figure 11 The FFT spectrum of the impeller of this application and the existing general design impeller is calculated at a speed of 5000 rpm.

[0032] Figure 12 This is a performance comparison chart of the impeller of this application and an existing general design impeller in terms of the number of blades, flow rate, and static pressure.

[0033] Figure 13 This is an airflow velocity measurement diagram at outlets P1 and P2 for another type of ordinary impeller (C types). Detailed Implementation

[0034] To illustrate the technical content and structural features of this application in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0035] This application provides an electronic device, including but not limited to mobile Wi-Fi, power bank, mobile phone, laptop / tablet, wearable device (virtual augmented display glasses, augmented reality glasses, smartwatch, etc.), smart screen device, in-vehicle device (such as car infotainment system), industrial equipment, etc.

[0036] One embodiment of the electronic device is a laptop computer, which includes a casing, a heat-generating device, and a fan. The heat-generating device and fan are installed inside the casing. The heat-generating device includes, but is not limited to, a CPU processor, a northbridge chip, memory, and a graphics card. The fan is mainly used to dissipate heat from the heat-generating device to prevent overheating from affecting performance. The fan is installed according to the location of the heat-generating device, and can be installed close to it. The fan provided in this application includes a motor and an impeller. The motor drives the impeller to rotate, guiding airflow over the aforementioned heat-generating components, thereby dissipating heat from the components. The structure of the motor is well known to those skilled in the art, and will not be described in detail here. This application mainly improves the structure of the impeller 10, so the following focuses on describing the structure of the impeller 10.

[0037] like Figure 1 and Figure 2As shown, the impeller 10 of this application includes a hub 11 and a plurality of independent blades. The blades are arranged in an alternating pattern and extend radially outward along the impeller 10. Each blade has a root and an end, with the root connected to the side of the hub 11 and the ends located on the same circular line O1. The lengths of adjacent blades are different. The structure of the impeller 10 of this application is described below with reference to a first embodiment. The impeller 10 has a plurality of blades, including two types: a first blade 12 and a second blade 13. Both the first blade 12 and the second blade 13 extend radially outward along the hub 11, and their structure is roughly similar to a "spoke". The roots of both the first blade 12 and the second blade 13 are connected to the side of the hub 11, and the ends of both the first blade 12 and the second blade 13 are located on the same circular line O1. The length of the first blade 12 is greater than the length of the second blade 13.

[0038] In existing technologies, the blades are all of the same length, and the outlet width between them is also approximately equal. This ensures that the airflow velocity of two adjacent blades is consistent, resulting in uniform radial airflow. Figure 4 It is evident that the intensity of the airflow exiting each outlet is approximately equal. However, in this application, because the lengths of the first blade 12 and the second blade 13 are not the same, this disrupts the existing uniformity of radial airflow, weakening the uniformity of radial airflow. Figure 2 As can be seen, the first outlet 02 between the second blade 13 and the preceding first blade 12 is wide, while the second outlet 03 between the second blade 13 and the following first blade 12 is narrow. The air velocity at the first outlet 02 is relatively low, while the air velocity at the second outlet 03 is relatively high. This indicates that the flow velocity of the impeller 10 follows a "weak-strong-weak-strong..." distribution, disrupting the uniformity of the airflow and causing variations in air velocity. Testing revealed that this effectively reduces the noise frequency generated by the blades during operation, suppressing noise. Therefore, utilizing this characteristic, we reduced the blade thickness and added blades of varying lengths. Compared to an impeller of the same size, the improved impeller has more blades, weakening the uniformity of airflow between blades and generating more airflow during operation. This meets the increasingly higher heat dissipation requirements of today's thin and light products. In contrast, the noise frequency of the improved impeller did not increase, achieving a better effect.

[0039] The first embodiment described above arranges blades of two lengths, but it is also possible to arrange blades of many different lengths, such as three, four, five, etc. For example, the structure of an impeller 10 using three different blade lengths will be described below in conjunction with a second embodiment. Figure 3As shown, unlike the first embodiment, the second embodiment adds a third blade 14 of a new length. The first blade 12, the second blade 13, and the third blade 14 are arranged sequentially along the circumference of the fan hub 11. The root of the third blade 14 is connected to the side of the fan hub 11. The ends of the first blade 12, the second blade 13, and the third blade 14 are all on the same circular line 01. The length of the third blade 14 is less than the length of the second blade 13. The first outlet 02 enclosed by the first blade 12 and the preceding third blade 14 is wide, the second outlet 03 enclosed by the first blade 12 and the second blade 13 is narrow, and the third outlet 04 enclosed by the second blade 13 and the following third blade 14 is wider. The first outlet 02 has a low air velocity, the second outlet 03 has a relatively high air velocity, and the third outlet 04 has an even lower air velocity. The flow velocity of the impeller 10 is distributed in the pattern of "weak-strong-weaker-weak-strong...", which breaks the uniformity of the air flow and results in differences in the air velocity. Similarly, it achieves the same effect as the first embodiment.

[0040] It can be understood that, depending on actual needs, more blades of different lengths can be arranged on the impeller 10, keeping the root of each blade connected to the side of the hub 11, and the ends of each blade on the same circular line 01. Dividing the blades on the impeller 10 into multiple groups, with each blade in the same group having a different length, can achieve the same effect as the first embodiment and the second embodiment.

[0041] The blades all extend outward along the radial direction of the hub 11, such as Figure 1 As shown, the blades extend outward in a clockwise direction along the radial direction of the hub 11. Each blade includes a first structural portion 05 extending in a first direction and a second structural portion 06 extending from the end of the first structural portion 05 in a second direction. The first and second directions have different orientations. The orientation angles of the first and second directions are not strictly limited here; they can be set according to actual needs. This limitation restricts each blade to be roughly divided into two parts, resulting in different lengths for each blade within the same group. Of course, depending on actual needs, one of two adjacent blades can be set as a straight blade, and the other as a curved blade; or both adjacent blades can be set as curved blades, but with different curvature angles, which also results in different lengths for each blade within the same group. Preferably, the length ratio of two adjacent blades is A:B, where A is 102-110 and B is 100. The width ratio of the first outlet 02 to the second outlet 03 is C:D, where C is 55-75 and D is 25-45. It should be noted that the width ratio of the second outlet 03 to the third outlet 04 is set as needed and is not limited here.

[0042] like Figures 1 to 3As shown, in another embodiment, the impeller 10 of this application further includes a ring 15. The ring 15 is connected to the hub 11 via blades and surrounds the outer periphery of the hub 11. The blades are connected to the ring 15 and disposed on one surface of the ring 15. The ring 15 and the hub 11 are integrally formed into a single structure. Preferably, the impeller is integrally formed by injection molding or powder metallurgy.

[0043] like Figure 5 As shown, the fan hub 11 is mounted on the rotor of the motor, which is also called the magnetic assembly 20. The magnetic assembly 20 includes a magnet 21 and an iron shell 22. The motor shaft 23 is connected to the fan hub 11, which is made of plastic or metal.

[0044] The impeller 10 of this application can be designed according to the following method, as shown in the figure below. Figures 6 to 8 As shown. If we want to manufacture two types of blades, the first blade 12 and the second blade 13, we first design the first blade 12 according to half the total number of blades, resulting in... Figure 7 The structure is shown below. Next, the second blade 13 is arranged between the two first blades 12, and the rotation array is copied according to the number of first blades 12 to design the model, resulting in the structure shown below. Figure 8 The structure shown is illustrated. Based on this, other types of blades can be designed, such as the third blade 14, etc.

[0045] To demonstrate that the impeller 10 provided in this application truly possesses the aforementioned advantages, a model test was performed on the impeller 10 of this application. The comparison object was a general impeller (represented as General design in the attached figures), which has uniformly distributed blades with equal lengths. The impeller of this application (represented as AB blade types in the attached figures) has the same dimensions and the same number of blades as the general impeller, but it contains two types of blades: a first blade 12 and a second blade 13, and the outlet is also different.

[0046] Take the openings P1 and P2 of the two impellers as detection points, and then... Figure 9 It is evident that the air velocity of the impeller in this application is lower than that of a conventional impeller at both openings P1 and P2. Since the lower the outlet air velocity, the lower the noise, the impeller using the solution in this application can significantly suppress noise.

[0047] In addition, such as Figure 11 As shown, the blades of the impeller 10 of this application can also effectively suppress noise. The comparison object is an existing ordinary impeller (shown as General design in the attached figure), with the following structural form... Figure 4As shown, the blades of this impeller are evenly distributed and all blades are of equal length. The impeller of this application (represented as AB blade types in the attached figure) has the same dimensions and the same number of blades as a conventional impeller, but it contains two types of blades: a first blade 12 and a second blade 13, and the outlet is also different.

[0048] At the same location on the blade, four detection points were selected: P1-1, P1-2, P1-3, and P1-4. The values ​​of turbulence k-energy and surface pressure were measured at these four points. Figure 10 As can be seen, compared with ordinary blades, the turbulent kinetic energy and surface pressure at the four detection points on the blade of this application are significantly reduced. The smaller the values ​​of turbulent kinetic energy and surface pressure, the lower the frequency of the working blade, and the less noise it generates.

[0049] Furthermore, when the FFT spectrum was measured at a speed of 5000 rpm, the smaller the spectrum value, the lower the noise. Compared with existing ordinary impellers (represented as General design in the attached figure), the impeller of this application (represented as AB bladetypes in the attached figure) has a lower noise value.

[0050] Furthermore, generally speaking, the lower the outlet flow velocity, the lower the noise. After comparison, the impeller using the scheme of this application, compared to impellers using blades of equal length, or impellers using both long and short blades but where the short blades are not simultaneously connected to the hub and the ring (see attached diagram),... Figure 13 As shown in the attached diagram (represented as C types), and Figure 9 Compared to the impellers (AB blade types) in this application, the airflow velocity of the impeller in this application is significantly reduced, thereby reducing noise generation.

[0051] As mentioned above, the more blades an impeller has, the greater the airflow generated during operation, which is more helpful for heat dissipation. Therefore, to accommodate more blades, this application limits the blade thickness to 0.08-2.0 mm. Understandably, thinner blades mean more blades; however, testing revealed that... Figure 12 As can be seen, by adopting the scheme of this application, setting the blade thickness to 0.1mm compared to setting it to 0.25mm increases the number of blades from 71 to 107, resulting in a 51% improvement in efficiency, while increasing the flow rate (CFM) from 3.13 to 3.49, resulting in a 12% improvement in efficiency. A higher number of blades leads to a higher flow rate and a larger air volume, which is beneficial for heat dissipation. Figure 12As shown in the graphs, at a limited rotational speed of 6300 rpm, under the same output flow rate, the impeller 10 with more blades has a lower static pressure, which is beneficial for noise reduction. Under the same static pressure, the impeller 10 with more blades has a higher output flow rate, which is beneficial for increasing air volume and improving heat dissipation. This demonstrates that by adopting the scheme of this application and setting the blade thickness within the range of 0.08-2.0 mm, a larger number of blades can be accommodated, which is beneficial for increasing the impeller's output flow rate and suppressing blade noise, resulting in excellent performance.

[0052] The above-disclosed examples are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall fall within the scope of this application.

Claims

1. An impeller, characterized in that, include: Fan hub; A plurality of independent blades are arranged in a circular array around the fan hub, with staggered spacing between them. Each blade extends radially outward from the fan hub, with a root and an end point. The root of each blade connects to the side of the fan hub, and the ends of all blades lie on the same circular line. The lengths of adjacent blades are unequal. The blades and the ends of adjacent blades form a first outlet, and the blades and the ends of another adjacent blade form a second outlet. The opening widths of the first and second outlets are unequal. One of two adjacent blades is either a straight blade or a curved blade, and the other of two adjacent blades is a curved blade. The blades include three types: a first blade, a second blade, and a third blade. The first blade, the second blade, and the third blade are arranged sequentially along the circumference of the fan hub. The roots of the first blade, the second blade, and the third blade are all connected to the side of the fan hub. The ends of the first blade, the second blade, and the third blade are all on the same circular line. The length of the first blade is greater than the length of the second blade, and the length of the third blade is less than the length of the second blade. The narrowest outlet is located between the first blade and the second blade, while the widest outlet is located between the second blade and the third blade.

2. The impeller according to claim 1, characterized in that, The blade includes a first structural portion extending in a first direction and a second structural portion extending from the end of the first structural portion in a second direction, wherein the first direction and the second direction have different orientations.

3. The impeller according to claim 1, characterized in that, The length ratio of two adjacent blades is A:B, where A is 102-110 and B is 100.

4. The impeller according to claim 1, characterized in that, The width ratio of the first outlet to the second outlet is C:D, where C is 55-75 and D is 25-45.

5. The impeller according to claim 1, characterized in that, The thickness of the blade ranges from 0.08 to 2.0 mm.

6. The impeller according to claim 1, characterized in that, The number of blades of varying lengths is the same.

7. The impeller according to claim 1, characterized in that, It also includes a wheel ring, which is connected to the fan hub through the blade and surrounds the fan hub. The blade is connected to the wheel ring and disposed on one surface of the wheel ring. The wheel ring, fan hub and blade are integrally formed into a single structure.

8. A fan, characterized in that, The device includes a motor and an impeller as described in any one of claims 1-7, the motor including a shaft, the impeller hub being mounted on the shaft, and the motor being used to drive the shaft to rotate.

9. An electronic device, characterized in that, It includes a heat-generating device and a fan as described in claim 8 for dissipating heat from the heat-generating device.

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