Axial flow fan, motor assembly and hair dryer

Abstract

The application provides an axial flow fan, a motor assembly and a hair dryer. The axial flow fan comprises a hub, a guide air portion and a fan blade group. The length on the rotation axis is defined as height. The fan blade group comprises a plurality of first fan blades and a plurality of second fan blades. The first fan blade has a first root connected to the hub and a first tail away from the hub. The second fan blade has a second root connected to the hub and a second tail away from the hub. The first root and the guide air portion at least partially coincide along the rotation axis. The second root and the guide air portion at least partially coincide along the rotation axis. The height of the first root is less than the height of the first tail. The height of the second root is less than the height of the second tail. The height of the first root is less than the height of the second root. The height of the second root of the first fan blade and the second fan blade is small, which is beneficial to form a negative pressure space without disturbance near the rotation axis and reduce wind resistance and improve air output. The second root has a greater height than the first root, which ensures that the axial flow fan has sufficient strength.

Description

Technical Field

[0001] This application relates to the field of fans, and more particularly to an axial fan, a motor assembly, and a hair dryer. Background Technology

[0002] Fans have a wide range of applications in the industrial field. For example, when an electric motor is working, it generates heat. To facilitate the dissipation of heat from the motor, a common heat dissipation method is convection, which involves installing a fan in a location that is conducive to the cooling of the motor. When the fan rotates, it generates airflow to carry away the heat generated by the motor.

[0003] Taking an axial fan as an example, air enters from the axial direction. The blades of a traditional fan are all the same height from the root (the part near the motor axis) to the tail (the part away from the motor axis). Because the size of the blade root is relatively large, it increases the wind friction and reduces the unobstructed negative pressure area near the axis, affecting the wind speed and air volume. Summary of the Invention

[0004] This application provides an axial fan, motor assembly, and blower that improve airflow and have high structural strength.

[0005] Specifically, this application provides an axial flow fan, including a hub, a guide vane, and a blade assembly connected to the guide vane. The centerline of the hub is the rotation axis of the axial flow fan. The length of the blade assembly on the rotation axis is defined as its height. The blade assembly includes a plurality of first blades and a plurality of second blades. The first blades have a first root portion connected to the hub and a first tail portion away from the hub. The second blades have a second root portion connected to the hub and a second tail portion away from the hub. The axial flow fan also includes a guide cone with a central opening connected to the first tail portion and the second tail portion. Viewed along the rotation axis, the first root portion and the guide vane at least partially overlap, and the second root portion and the guide vane at least partially overlap. The height of the first root portion is less than the height of the first tail portion, the height of the second root portion is less than the height of the second tail portion, and the height of the first root portion is less than the height of the second root portion. The height of the first root portion is greater than the height of the guide vane. The outer diameter of the guide vane is greater than the outer diameter of the hub and less than the outer diameter of the axial flow fan.

[0006] Furthermore, the first fan blade includes a first transition portion connecting the first root and the first tail, and the second fan blade includes a second transition portion connecting the second root and the second tail; the height of the first transition portion gradually increases in the direction away from the wheel hub, and the height of the second transition portion gradually increases in the direction away from the wheel hub.

[0007] Furthermore, the ratio of the height of the first root to the height of the first tail is greater than 1 / 8 and less than 1, and the ratio of the height of the second root to the height of the second tail is greater than 5 / 16 and less than 1.

[0008] Furthermore, the angle between the air guide cone and the rotation axis is α, where 60°≤α<90°.

[0009] Furthermore, when viewed along the axis of rotation, the first tail and the second tail are exposed through the central opening.

[0010] Furthermore, the axial fan also includes a stop ring, which is connected to the inner edge of the air guide cone and extends along the rotation axis.

[0011] Furthermore, the first fan blade and the second fan blade are arranged alternately, and the air guide is connected to the hub and located on the outside of the hub.

[0012] On the other hand, this application also provides a motor assembly, which includes a motor and an axial fan as described above, wherein the hub is fixed to the motor shaft.

[0013] In another aspect, this application also provides a hair dryer, which includes a motor and an axial fan as described above, wherein the motor drives the axial fan to rotate for cleaning operations.

[0014] In this application, the height of the second root of the first blade and the second blade is relatively small, which is conducive to forming a undisturbed negative pressure space near the axis of rotation, and helps to reduce wind resistance and increase air volume; the second root has a greater height than the first root, ensuring that the axial fan has sufficient strength. Attached Figure Description

[0015] Figure 1 This is a perspective view of one embodiment of the axial fan of this application.

[0016] Figure 2 yes Figure 1 A three-dimensional schematic diagram of an axial fan from another angle.

[0017] Figure 3 yes Figure 1 The diagram shows a cross-sectional view of an axial fan.

[0018] Figure 4 This is a schematic diagram of the motor assembly of this application. Detailed Implementation

[0019] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application.

[0020] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “a” or “one,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. “A plurality” or “several” indicates two or more. Unless otherwise stated, the terms “front,” “rear,” “lower,” and / or “upper,” and similar terms are for ease of description only and are not limited to a location or spatial orientation. The terms “comprising,” “including,” and similar terms mean that the elements or objects preceding “comprising,” encompass the elements or objects listed following “comprising,” and their equivalents, and do not exclude other elements or objects. The terms “connected,” “linked,” and similar terms are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. The singular forms “a,” “the,” and “the” used in this application specification and appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0021] This application provides an axial flow fan. Please refer to the embodiments provided. Figures 1 to 3 The axial fan 1 includes a hub 11, a blade assembly 12, and an air guide 13. The air guide 13 is connected to both the hub 11 and the blade assembly 12. The blade assembly extends outward from the hub 11, so that the air guide 13 surrounds the outside of the hub 11. The hub 11 is used to fix itself to a drive shaft (e.g., a motor shaft) to obtain power. The centerline of the hub 11 is the rotation axis L of the axial fan 1, and the dimension on the rotation axis L is defined as the height.

[0022] The fan blade assembly 12 includes a plurality of first fan blades 121 and a plurality of second fan blades 122. Each first fan blade 121 includes a first root portion 1211 connecting to the hub 11, a first tail portion 1213 away from the hub, and a first transition portion 1212 connecting the first root portion 1211 and the first tail portion 1213. Each second fan blade 122 includes a second root portion 1221 connecting to the hub 11, a second tail portion 1223 away from the hub, and a second transition portion 1222 connecting the second root portion 1221 and the second tail portion 1223. The height of the first root portion 1211 is less than the height of the first tail portion 1213, and the height of the second root portion 1221 is less than the height of the second tail portion 1223. When the axial flow fan draws air in, a negative pressure zone easily forms in the central area near the axis of rotation L. Air is then radially discharged from the transition portion and tail portion of the first fan blades 121 and the second fan blades 122, thereby generating a larger airflow.

[0023] In this embodiment, the first fan blade 121 and the second fan blade 122 are arranged alternately. Since the second root 1221 of the second fan blade 122 has a larger height, it can provide greater strength, while the lower first root 1211 has a smaller height, thus reserving a negative pressure area. This ensures that the axial fan has a large air volume while ensuring sufficient structural strength.

[0024] Optionally, the ratio of the height of the first root portion 1211 to the height of the first tail portion 1213 is 1 / 8 to 1, and the ratio of the height of the second root portion 1221 to the height of the second tail portion 1223 is 5 / 16 to 1. Experiments have shown that the closer the heights of the first root portion 1211 and the second root portion 1221 are to the dimensions of the first tail portion 1213 and the second tail portion 1223, the greater the wind resistance of the first blade 121 and the second blade 122, and the correspondingly smaller the airflow, while the strength also increases accordingly. To balance structural strength and airflow, preferably, the ratio of the height of the first root portion 1211 to the height of the first tail portion 1213 is 1 / 8 to 3 / 4, and the ratio of the height of the second root portion 1221 to the height of the second tail portion 1223 is 5 / 16 to 3 / 4.

[0025] Preferably, the height of the first transition portion 1212 gradually increases in the direction away from the hub 11, and the height of the second transition portion 1222 gradually increases in the direction away from the hub 11, so that the air is smoothly guided by the first transition portion 1212 and the second transition portion 1222, which helps to reduce wind resistance and wind noise.

[0026] To further increase the strength of the axial fan, the height of the first root portion 1211 is preferably greater than the height of the air guide portion 13. The outer diameter of the air guide portion 13 is greater than the outer diameter of the hub 11 and smaller than the outer diameter of the axial fan 1, so as to effectively guide the air. Optionally, the air guide portion 13 can be flat or curved, depending on the air outlet direction.

[0027] Optionally, the axial fan 1 further includes a guide cone 14, which has a central opening 140 and is connected to the first tail portion 1213 and the second tail portion 1223. The angle between the guide cone 14 and the rotation axis L is α, where 60°≤α<90°. Generally, the smaller the angle α, the larger the axial airflow and the smaller the centrifugal airflow. In this embodiment, 60°≤α≤80° is preferred. Specifically, the ratio of axial to centrifugal airflow can be adjusted according to the product's axial airflow requirements.

[0028] Viewed along the rotation axis L: the first root 1211 and the air guide 13 at least partially overlap, and the second root 1221 and the air guide 13 at least partially overlap, so that the first fan blade and the air guide have a large connection area, thereby ensuring structural strength; the first tail 1213 and the second tail 1223 are partially exposed through the central opening 140.

[0029] The axial fan also includes a stop ring 15, which is connected to the inner edge of the air guide cone 14 and extends along the rotation axis L. The stop ring 15 engages with the inner hole of the housing (e.g., the housing of a power tool), and the stop ring 15 and the inner surface of the inner hole form a labyrinth structure to prevent foreign objects from flowing into the housing with the air and damaging the motor. It also prevents the exhaust air of the axial fan from flowing back after reflection.

[0030] On the other hand, this application also provides a motor assembly, such as Figure 4 As shown, the motor assembly includes a motor 2 and an axial fan 1 as described above. The hub 11 is fixed to the motor shaft 20. The axial fan 1 is used to dissipate heat for the motor 2, and can also dissipate heat for the transmission mechanism, control board and other structures of other equipment (such as power tools) that are equipped with the motor assembly.

[0031] On another front, this application also provides a hair dryer, which includes a motor and a fan as described above. The fan is mounted on the motor shaft, which is the output shaft. The motor drives the axial fan to rotate for cleaning operations. It should be noted that the hair dryer needs to generate significant airflow to blow away the target (such as leaves, snow, etc.), therefore the size of the axial fan in the hair dryer is much larger than the size of the axial fan in the aforementioned motor assembly.

[0032] In this application, the height of the second root of the first blade and the second blade is relatively small, which is conducive to forming a undisturbed negative pressure space near the axis of rotation, and helps to reduce wind resistance and increase air volume; the second root has a greater height than the first root, ensuring that the axial fan has sufficient strength.

[0033] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Although this application has disclosed the preferred embodiment as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An axial flow fan, comprising a hub, an air guide section, and a blade assembly connected to the air guide section, wherein the centerline of the hub is the rotation axis of the axial flow fan, and the length of the blade assembly on the rotation axis is defined as its height, characterized in that... The fan blade assembly includes a plurality of first fan blades and a plurality of second fan blades. The first fan blades have a first root portion connected to the hub and a first tail portion away from the hub. The second fan blades have a second root portion connected to the hub and a second tail portion away from the hub. The axial fan also includes a guide cone, which has a central opening and is connected to the first tail and the second tail. Viewed along the rotation axis, the first root portion and the air guide portion at least partially overlap; the second root portion and the air guide portion at least partially overlap. The height of the first root is less than the height of the first tail, the height of the second root is less than the height of the second tail, and the height of the first root is less than the height of the second root; the height of the first root is greater than the height of the air guide; the outer diameter of the air guide is greater than the outer diameter of the hub and less than the outer diameter of the axial fan.

2. The axial flow fan according to claim 1, characterized in that, The first fan blade includes a first transition portion connecting the first root and the first tail, and the second fan blade includes a second transition portion connecting the second root and the second tail; The height of the first transition section gradually increases in the direction away from the wheel hub, and the height of the second transition section gradually increases in the direction away from the wheel hub.

3. The axial flow fan according to claim 2, characterized in that, The ratio of the height of the first root to the height of the first tail is greater than 1 / 8 and less than 1, and the ratio of the height of the second root to the height of the second tail is greater than 5 / 16 and less than 1.

4. The axial flow fan according to claim 1, characterized in that, The angle between the air guide cone and the rotation axis is α, where 60°≤α<90°.

5. The axial flow fan according to claim 4, characterized in that, The axial fan also includes a stop ring, which is connected to the inner edge of the air guide cone and extends along the rotation axis.

6. The axial fan according to any one of claims 1 to 5, characterized in that, The first fan blade and the second fan blade are arranged alternately, and the air guide is connected to the hub and located outside the hub.

7. A motor assembly, characterized in that, The motor assembly includes a motor and an axial fan as described in any one of claims 1 to 6, wherein the hub is fixed to the motor shaft.

8. A hair dryer, characterized in that, The hair dryer includes a motor and an axial fan as described in any one of claims 1 to 6, wherein the motor drives the axial fan to rotate for cleaning operations.

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