Impeller, fan, and electronic device

Abstract

An impeller, which has the advantage of having an increased number of blades while suppressing noise generation. The impeller of the present application comprises a fan hub and a plurality of mutually independent blades. The blades are arranged on the periphery of the fan hub and distributed in an annular array, the blades being staggered at intervals from one another. Each blade extends outwards in the radial direction of the impeller. Two ends of each blade are respectively a root and a tip, the roots of the blades being connected to the side face of the fan hub, and the tips of the blades all being located on the same circular ring line. Two adjacent blades have different lengths.

Description

Impellers, fans and electronic equipment Technical Field

[0001] The present application relates to the field of heat dissipation equipment, and in particular to impellers, fans and electronic equipment. Background Art

[0002] Many electronic devices are equipped with fans, which are used to dissipate heat from the heating components of electronic devices. For some electronic devices, such as laptops and industrial equipment, when the temperature of heating components (such as CPU) becomes high, the corresponding heat dissipation capacity of the fan must be improved, but this also indirectly affects the increase in noise, so the requirements for the fan's silent performance are higher.

[0003] The core component of the fan is the impeller, as shown in Figure 4. The impeller includes a hub 07 and a plurality of blades 08 arranged on the hub 07. One end of the blade 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 enclosed between the two blades 08 is basically equal, and each opening 09 discharges air evenly. However, this also causes the noise generated when the air is discharged to be superimposed on each other, resulting in greater noise.

[0004] In addition, due to limitations in manufacturing technology, previous blades were relatively thick, making it difficult to increase the number of blades. The more blades there are, the greater the air volume and the better the heat dissipation effect.

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

[0006] Application Contents

[0007] The object of the present application is to provide an impeller which increases the number of blades of different lengths and can suppress noise generation.

[0008] Another object of the present application is to provide a fan comprising an impeller capable of increasing the number of blades of different lengths and suppressing noise generation.

[0009] Another object of the present application is to provide an electronic device comprising an impeller capable of increasing the number of blades of different lengths and suppressing noise generation.

[0010] To achieve the above objectives, the present application provides an impeller comprising a hub and a plurality of independent blades. The blades are arranged around the hub in an annular array, with the blades staggered and spaced apart. The blades extend radially outward from the hub, with a root and a tip at each end. The root of the blade is connected to the side of the hub, and the tips of the blades are located on the same circular line. Adjacent blades have different lengths.

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

[0012] Preferably, the blade includes a first structural portion extending along a first direction and a second structural portion extending from an end portion of the first structural portion toward a second direction, and the first direction and the second direction have different directions.

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

[0014] Preferably, the width ratio of the first outlet to the second outlet is C:D, wherein 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 blades of different lengths may be two, three or more types.

[0018] Preferably, the number of blades of different lengths is the same.

[0019] Preferably, the impeller of the present application also includes a ring, which is connected to the hub through blades and is arranged around the outer periphery of the hub. The blades are connected to the ring and are arranged on a surface of the ring. The ring, hub and blades are integrally formed into an integrated structure.

[0020] Compared with the prior art, in the prior art, the lengths of the blades are all the same, and the widths of the outlets between the two are also roughly equal, which makes the air outlet speeds of the two adjacent blades consistent, the radial air outlet is consistent, and the intensity of the air flowing out of each outlet is roughly equal. In the present application, since the lengths of the first blade and the second blade are different, this breaks the uniformity of the existing radial air outlet, and the uniformity of the radial air outlet is weakened. The first outlet between the second blade and the previous first blade is wide, and the second outlet between the second blade and the next first blade is narrow. The air outlet speed of the first outlet is relatively low, while the air outlet speed of the second outlet is relatively high. It can be seen that the flow rate of the impeller is distributed in the pattern of "weak-strong-weak-strong...", breaking the uniformity of the air outlet and causing differences in the air outlet flow rate. After testing, it was found that this effectively reduces the noise frequency generated when the blades are working and suppresses the noise. Therefore, taking advantage of this feature, we reduced the thickness of the blades and added some blades of different lengths. Compared with the impeller of the same size, the improved impeller has more blades, the uniformity of the air output between the blades is weakened, and the air volume generated during operation is also greater, which meets the increasingly high heat dissipation requirements of today's thin and light products. In contrast, the noise frequency of the improved impeller has not increased, achieving better results.

[0021] To achieve the other purpose mentioned above, the present application provides a fan including a motor and the above-mentioned impeller, the motor including a rotating shaft, the fan hub of the impeller is installed on the rotating shaft, and the motor is used to drive the rotating shaft to rotate.

[0022] To achieve the above-mentioned further object, the device includes a heating device and the above-mentioned fan for dissipating heat from the heating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic structural diagram of an impeller according to a first embodiment of the present application.

[0024] FIG2 is a schematic diagram of the impeller shown in FIG1 when rotating.

[0025] FIG3 is a schematic structural diagram of the impeller of the second embodiment of the present application when rotating.

[0026] FIG4 is a schematic diagram of a conventional impeller during rotation.

[0027] FIG5 is a schematic structural diagram of the impeller of the present application when installed on the magnetic assembly.

[0028] 6 to 8 are schematic diagrams of the impeller design process of the present application.

[0029] FIG9 is a comparative test diagram of the air flow rate at the corresponding outlets of the impeller of the present application and the conventional general design impeller.

[0030] FIG10 is a comparative test diagram of the turbulent kinetic energy and surface pressure at corresponding positions of the blades of the impeller of the present application and the conventional general design impeller.

[0031] FIG11 shows the FFT spectra of the impeller of the present application and the conventional general design impeller at a rotation speed of 5000 rpm.

[0032] FIG12 is a performance comparison experimental diagram of the number of blades, flow rate, and static pressure of the impeller of the present application and the existing general impeller (General design).

[0033] FIG. 13 is a diagram showing air flow rate detection at outlets P1 and P2 of another conventional impeller (type C). DETAILED DESCRIPTION

[0034] In order to explain the technical content and structural features of the present application in detail, the following further describes the embodiments in conjunction with the accompanying drawings.

[0035] The present application provides an electronic device, which includes but is not limited to mobile wifi, power banks, mobile phones, notebooks / tablets, wearable devices (virtual augmented display glasses, augmented reality glasses, smart watches, etc.), smart screen devices, vehicle-mounted devices (such as car computers), industrial equipment, etc.

[0036] The electronic device in one embodiment is a laptop computer, which includes a housing, a heating device and a fan. The heating device and the fan are installed in the housing. The heating device includes but is not limited to a CPU processor, a north bridge chip, a memory and a graphics card. The fan is mainly used to dissipate heat from the heating device to prevent the performance from being affected by excessive temperature. The fan is installed according to the position of the heating device and can be installed in a close and close manner. The fan provided in the present application includes a motor and an impeller. The motor drives the impeller to rotate and guides the wind to flow through the above-mentioned heating components, thereby dissipating heat from the heating components. The structure of the motor is well known to those skilled in the art, so it will not be repeated here. The present application mainly improves the structure of the impeller 10, so the structure of the impeller 10 will be described in detail below.

[0037] As shown in Figures 1 and 2, the impeller 10 of the present application includes a hub 11 and a plurality of independent blades. The blades are arranged in an interlaced manner and extend radially outward from the impeller 10. The two ends of the blade are respectively a root and a tip. The root of the blade is connected to the side of the hub 11, and the tip of the blade is located on the same circular line 01. The lengths of two adjacent blades are different. The structure of the impeller 10 of the present application is described below with the help of the first embodiment. There are a plurality of blades, including two types, one of which is a first blade 12 and the other is a second blade 13. The first blade 12 and the second blade 13 both extend radially outward from the hub 11. At this time, the first blade 12 and the second blade 13 are roughly similar to the structure of "spokes". The root of the first blade 12 and the root of the second blade 13 are both connected to the side of the hub 11, and the tip of the first blade 12 and the tip of the second blade 13 are both on the same circular line 01. The length of the first blade 12 is greater than the length of the second blade 13.

[0038] In the prior art, the lengths of the blades are all the same, and the widths of the outlets between them are also roughly equal, which makes the air outlet speeds of two adjacent blades consistent and the radial air outlet consistent. As shown in FIG4 , the intensity of the air flowing out of each outlet is roughly equal. However, in the present application, since the lengths of the first blade 12 and the second blade 13 are different, this breaks the uniformity of the existing radial air outlet, and the uniformity of the radial air outlet is weakened. As shown in FIG2 , the first outlet 02 between the second blade 13 and the previous first blade 12 is wide, and the second outlet 03 between the second blade 13 and the next first blade 12 is narrow. The air outlet speed of the first outlet 02 is relatively low, while the air outlet speed of the second outlet 03 is relatively high. Therefore, the flow rate of the impeller 10 is distributed in a "weak-strong-weak-strong..." pattern, breaking the uniformity of the air outlet and causing differences in the air outlet flow rate. After testing, it was found that this effectively reduces the noise frequency generated when the blades are working and suppresses the noise. Therefore, taking advantage of this feature, we reduced the thickness of the blades and added some blades of different lengths. Compared with the impeller of the same size, the improved impeller has more blades, the uniformity of the air output between the blades is weakened, and the air volume generated during operation is also greater, which meets the increasingly high heat dissipation requirements of today's thin and light products. In contrast, the noise frequency of the improved impeller has not increased, achieving better results.

[0039] The first embodiment described above arranges blades of two lengths, but more blades of different lengths may also be arranged, such as 3, 4, 5, etc. For example, the structure of the impeller 10 using blades of three different lengths is described below in conjunction with the second embodiment. As shown in FIG3 , 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 in sequence along the circumference of the hub 11. The root of the third blade 14 is connected to the side of the 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 previous 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 next third blade 14 is wider. The air outlet speed of the first outlet 02 is low, the air outlet speed of the second outlet 03 is relatively high, and the air outlet speed of the third outlet 04 is even lower. The flow rate of the impeller 10 is distributed in the order of "weak-strong-weaker-weak-strong...", breaking the uniformity of the air outlet and causing differences in the air outlet flow rate. Similarly, the same effect as the first embodiment is achieved.

[0040] It is understood that, depending on actual needs, blades of more different lengths may be arranged on the impeller 10, with the root of each blade connected to the side of the hub 11 and the tip of each blade located on the same circular line 01. Dividing the blades on the impeller 10 into multiple groups, with the blades in the same group having different lengths, can also achieve the same effects as the first and second embodiments.

[0041] The blades all extend radially outward from the hub 11. As shown in Figure 1, the blades all extend outwardly in a clockwise, radial direction from the hub 11. The blades include 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 defined and can be adjusted based on practical needs. This limitation is to constrain each blade to be roughly divided into two parts, resulting in different lengths for each blade within the same group. Of course, depending on practical needs, one of two adjacent blades can be straight and the other curved, or both can be curved but at different angles, thus also varying the lengths of each blade within the same group. Preferably, the length ratio of the 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] As shown in Figures 1 to 3, in another embodiment, the impeller 10 of the present application further includes a ring 15. The ring 15 is connected to the hub 11 via blades and is disposed around the outer periphery of the hub 11. The blades are connected to the ring 15 and disposed on a surface of the ring 15. The ring 15 and the hub 11 are integrally formed into a one-piece structure. Preferably, the impeller is integrally formed by injection molding or powder metallurgy.

[0043] As shown in Figure 5, 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, and the fan hub 11 is made of plastic or metal.

[0044] The impeller 10 of the present application can be designed according to the following method, as shown in Figures 6 to 8. If two blade types, first blades 12 and second blades 13, are to be manufactured, first design the first blades 12 according to half the total number of blades, resulting in the structure shown in Figure 7. Next, the second blades 13 are placed between the two first blades 12, and a rotational array of replicas is performed according to the number of first blades 12, resulting in the structure shown in Figure 8. This can be used as a guide to design other blade types, such as third blades 14.

[0045] To demonstrate that the impeller 10 provided by the present application indeed possesses the aforementioned advantages, a model test was conducted on the impeller 10 of the present application. The comparison object was a conventional impeller (represented in the accompanying drawings as "General design"), which has evenly distributed blades of equal length. The impeller of the present application (represented in the accompanying drawings as "AB blade types") has the same dimensions and number of blades as the conventional impeller, but has two types of blades: first blade 12 and second blade 13, and a different outlet.

[0046] Taking the openings P1 and P2 of the two impellers as detection points, it can be seen from Figure 9 that the air flow velocity (Air Velocity) of the impeller of the present application at the openings P1 and P2 is lower than that of the ordinary impeller. Since the smaller the outlet air flow velocity, the smaller the noise, the impeller using the solution of the present application can significantly suppress noise.

[0047] In addition, as shown in Figure 11, the blades of the impeller 10 of the present application can also effectively suppress noise. The comparison object is an existing ordinary impeller (represented as General design in the figure), the structure of which is shown in Figure 4. The blades of this impeller are evenly distributed and the lengths of each blade are equal. The impeller of the present application (represented as AB blade types in the figure) has the same size and number of blades as the ordinary impeller, but has two types of blades, namely, first blade 12 and second blade 13, and the outlet is also different.

[0048] At the same position of the blade, four detection points are taken, namely P1-1, P1-2, P1-3, and P1-4, and the values ​​of turbulence kinetic energy (Turbulence k energy) and surface pressure (Surface pressure) are detected at these four detection points. It can be seen from Figure 10 that compared with ordinary blades, the turbulence kinetic energy and surface pressure at the four detection points on the blade of the present application are significantly reduced. The smaller the values ​​of turbulence kinetic energy and surface pressure, the smaller the frequency of the working blade and the smaller the noise.

[0049] In addition, when the FFT spectrum is measured at a rotation speed of 5000 rpm, the smaller the spectrum value, the smaller the noise. Compared with the existing ordinary impeller (represented as General design in the figure), the impeller of the present application (represented as AB blade types in the figure) has a smaller noise value.

[0050] In addition, in general, the lower the flow rate at the outlet, the smaller the noise. After comparison, the impeller using the solution of the present application, compared with the impeller using blades of equal length, or the impeller with long blades and short blades but the short blades are not connected to the fan hub and the ring at the same time (as shown in Figure 13, represented as C types in the figure), compared with the impeller of the present application in Figure 9 (AB blade types), the air flow velocity of the impeller of the present application is significantly reduced, thereby reducing the noise generation.

[0051] As mentioned above, the more blades an impeller has, the more air volume it generates during operation, which is more helpful for heat dissipation. To accommodate more blades, this application limits the blade thickness range to 0.08-2.0mm. It is understandable that the thinner the blade thickness, the more blades there are. The test results show that, as shown in Figure 12, using the solution of this application, setting the blade thickness to 0.1mm compared to setting the blade thickness to 0.25mm, the number of blades increases from 71 to 107, achieving a 51% improvement in efficiency, while the flow rate (CFM) increases from 3.13 to 3.49, achieving a 12% improvement in efficiency. The more blades there are, the higher the flow rate and the greater the air volume, which is beneficial for heat dissipation. As can be seen from the curve shown in Figure 12, when the speed is limited to 6300rpm, at the same output flow rate, the impeller 10 with a large number of blades has a lower static pressure, which is beneficial for noise reduction; at the same static pressure, the impeller 10 with a large number of blades has a higher output flow rate, which is beneficial for increasing air volume and improving heat dissipation. As described above, by adopting the solution of the present application, the thickness of the blade is set in the range of 0.08-2.0 mm, which can accommodate a larger number of blades, which is beneficial to increasing the output flow of the impeller and also beneficial to suppressing the noise of the blades, bringing good results.

[0052] The above disclosure is only a preferred example of the present application and cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are all within the scope covered by the present application.

Claims

1. An impeller, characterized in that: include: Fan hub; A plurality of blades are independent of each other, and the blades are arranged around the fan hub and distributed in a ring array. The blades are arranged at intervals and staggered, and the blades extend radially outward along the fan hub. The two ends of the blades are a root and a tip, respectively. The root of the blade is connected to the side of the fan hub, and the tips of the blades are all on the same circular line, and the lengths of two adjacent blades are different.

2. The impeller according to claim 1, characterized in that: The blade and the ends of the blades adjacent thereto enclose a first outlet, and the blade and the ends of another blade adjacent thereto enclose a second outlet, and the opening widths of the first outlet and the second outlet are different.

3. The impeller according to claim 1, characterized in that: The blade includes a first structure portion extending along a first direction and a second structure portion extending from an end of the first structure portion toward a second direction, and the first direction and the second direction have different directions.

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

5. The impeller according to claim 2, characterized in that: The width ratio of the first outlet to the second outlet is C:D, wherein C is 55-75 and D is 25-45.

6. The impeller according to claim 1, characterized in that The thickness of the blade is in the range of 0.08-2.0 mm.

7. The impeller according to claim 1, characterized in that 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.

8. The impeller according to claim 1, characterized in that The blades with different lengths may be of two, three or more types.

9. The impeller according to claim 1, characterized in that: The number of blades with different lengths is the same.

10. The impeller according to claim 1, characterized in that It also includes a wheel ring, which is connected to the fan hub through the blades and is arranged around the outer periphery of the fan hub. The blades are connected to the wheel ring and are arranged on a surface of the wheel ring. The wheel ring, fan hub and blades are integrally formed into an integrated structure.

11. A fan, characterized in that: It comprises a motor and an impeller as described in claims 1-10, wherein the motor comprises a rotating shaft, a hub of the impeller is mounted on the rotating shaft, and the motor is used to drive the rotating shaft to rotate.

12. An electronic device, characterized in that: The invention comprises the heat generating device and the fan as claimed in claim 11 for dissipating heat for the heat generating device.

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