Fan assembly and vacuum cleaner having the same

Abstract

This invention discloses a fan assembly and a vacuum cleaner having the same. The fan assembly includes a housing, an impeller assembly, a first guide member, a drive member, a bearing housing, and a first bearing. At least a portion of the impeller assembly is housed within the housing. The impeller assembly includes multiple impellers arranged in series in the airflow direction of the fan assembly. The first guide member is adapted to guide the airflow from the upstream impeller to the downstream impeller. The drive member drives the impellers to rotate. The bearing housing is detachably mounted on the first guide member and has a bearing mounting groove for accommodating the first bearing. The output shaft of the drive member passes through the first bearing. According to the fan assembly of this invention, the bearing housing effectively buffers the force transmitted from the output shaft of the drive member to the first bearing, thereby reducing the interference of vibrations from the drive member on the first guide member and improving the stability of the fan assembly.

Description

Technical Field

[0001] This invention relates to the field of vacuum cleaner technology, and in particular to a fan assembly and a vacuum cleaner having the same. Background Technology

[0002] As people's living standards improve, vacuum cleaners have gradually entered thousands of households, becoming an important cleaning appliance in daily life. The suction power of a vacuum cleaner directly affects its cleaning effect. However, in related technologies, the aerodynamic layout of the vacuum cleaner's fan assembly still has certain limitations, resulting in limited suction power, and the fan assembly is relatively large, taking up a significant amount of space. Summary of the Invention

[0003] This invention proposes a fan assembly that has the advantage of high stability.

[0004] The present invention also proposes a vacuum cleaner having the above-described fan assembly.

[0005] A fan assembly according to an embodiment of the present invention includes: a housing; an impeller assembly, at least a portion of which is housed within the housing, the impeller assembly including a plurality of impellers arranged in series in the airflow direction of the fan assembly; a first guide member adapted to guide the outlet air of the upstream impeller to the downstream impeller; a drive member for driving the impeller to rotate; a bearing housing detachably disposed on the first guide member; and a first bearing, the bearing housing having a bearing mounting groove for accommodating the first bearing, the output shaft of the drive member passing through the first bearing.

[0006] According to the wind turbine assembly of the present invention, the bearing housing can effectively buffer the force transmitted from the output shaft of the drive component to the first bearing, thereby reducing the interference of vibration of the drive component on the first guide component and improving the stability of the wind turbine assembly.

[0007] According to some embodiments of the present invention, in the airflow direction of the fan assembly, the distance between the bearing housing and the impeller on the upstream side is not less than the distance between the first guide member and the impeller on the upstream side.

[0008] According to some embodiments of the present invention, a limiting groove for accommodating the bearing seat is formed on the axial end face of the impeller facing upstream of the first guide member, and a first guide member through hole is formed on the bottom wall of the limiting groove, and the output shaft of the drive member passes through the first guide member through hole.

[0009] According to some embodiments of the present invention, the bearing housing includes: a main body portion, on which a bearing mounting groove is formed, and the bottom wall of the bearing mounting groove forms a bearing housing through hole opposite to the through hole of the first guide member; an outer ring portion, which is disposed around the outer periphery of the main body portion and is coaxially disposed with the main body portion; and a connecting portion, the two ends of which are respectively connected to the side walls opposite to the main body portion and the outer ring portion; wherein the main body portion, the outer ring portion and the connecting portion are all embedded in the limiting groove.

[0010] According to some embodiments of the present invention, the connecting portion is provided in multiple ways, and the multiple connecting portions are arranged at intervals along the outer peripheral wall of the main body.

[0011] According to some embodiments of the present invention, the limiting groove includes: a first limiting groove extending along the axial direction of the fan assembly, the main body being accommodated within the first limiting groove, and the bottom wall of the first limiting groove forming a through hole for the first flow guide; a second limiting groove extending along the circumferential direction of the fan assembly, the second limiting groove being annular, and the outer ring being accommodated within the second limiting groove; and a third limiting groove extending along the radial direction of the fan assembly, the two ends of the third limiting groove communicating with the first limiting groove and the second limiting groove respectively, and the connecting portion being located within the third limiting groove.

[0012] According to some embodiments of the present invention, the third limiting groove includes a first limiting sub-groove and a second limiting sub-groove arranged along the axial direction of the fan assembly, at least a portion of the connecting portion is located in the second limiting sub-groove, and in the circumferential direction of the fan assembly, the width of the first limiting sub-groove is greater than the width of the second limiting sub-groove.

[0013] According to some embodiments of the present invention, the connecting portion includes a first connecting segment and a second connecting segment arranged along the axial direction of the fan assembly. In the circumferential direction of the fan assembly, the width of the first connecting segment is greater than the width of the second connecting segment. The first limiting sub-groove is adapted to accommodate the first connecting segment, and the second limiting sub-groove is adapted to accommodate the second connecting segment.

[0014] According to some embodiments of the present invention, a support column is provided on the side of the bearing housing away from the upstream side of the impeller, the support column extends along the axial direction of the fan assembly toward the impeller away from the upstream side, and the limiting groove forms a support column through hole to receive the support column.

[0015] According to some embodiments of the present invention, the support column is disposed on the side of the outer ring portion away from the upstream side of the impeller, the support column perforation is formed on the bottom wall of the second limiting groove, and the support column perforation extends along the axial direction of the fan assembly.

[0016] According to some embodiments of the present invention, the support column is provided in multiple forms, and the multiple support columns are arranged at intervals along the circumference of the main body.

[0017] According to some embodiments of the present invention, the first guide member includes: a first guide member body, wherein the limiting groove is disposed on the axial end face of the impeller facing the upstream side of the first guide member body; a guide rib, wherein a plurality of guide ribs are provided, and the plurality of guide ribs are arranged at intervals along the outer peripheral wall of the first guide member body; a limiting external protrusion, wherein the limiting external protrusion is disposed on the outer peripheral wall of the first guide member body and extends along the axial direction of the first guide member, and the support through hole penetrates the limiting external protrusion and the first guide member body along the axial direction.

[0018] A vacuum cleaner according to an embodiment of the present invention includes: the above-described fan assembly.

[0019] According to the present invention, the vacuum cleaner can effectively buffer the force transmitted from the output shaft of the drive component to the first bearing through the bearing housing, thereby reducing the interference of vibration of the drive component on the first guide component and improving the stability of the fan assembly.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] Figure 1 This is an exploded view of a wind turbine assembly according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of one embodiment of a wind turbine assembly according to an embodiment of the present invention;

[0023] Figure 3 yes Figure 2 A cross-sectional view of the wind turbine assembly shown;

[0024] Figure 4 yes Figure 3 The center circle shows an enlarged view of part A;

[0025] Figure 5 This is an exploded view of the impeller of a wind turbine assembly according to an embodiment of the present invention;

[0026] Figure 6 This is a top view of the impeller disk according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of an angle of the first guide member of the wind turbine assembly according to an embodiment of the present invention;

[0028] Figure 8 yes Figure 7A schematic diagram of the first guide element from another angle;

[0029] Figure 9 yes Figure 7 A schematic diagram of the first guide element at another angle shown;

[0030] Figure 10 yes Figure 7 A schematic diagram of the first guide element shown from another angle;

[0031] Figure 11 This is a partial schematic diagram of the housing of a fan assembly according to an embodiment of the present invention;

[0032] Figure 12 This is a schematic diagram of the cooperation between the first and second flow guides;

[0033] Figure 13 This is a schematic diagram of another embodiment of a wind turbine assembly according to an embodiment of the present invention;

[0034] Figure 14 yes Figure 13 A cross-sectional view of the wind turbine assembly shown;

[0035] Figure 15 yes Figure 13 An exploded view of the wind turbine assembly shown.

[0036] Figure 16 This is a schematic diagram of an angle of the bearing housing of a wind turbine assembly according to an embodiment of the present invention;

[0037] Figure 17 yes Figure 16 A schematic diagram of another angle of the bearing housing shown.

[0038] Figure label:

[0039] Fan assembly 100;

[0040] 1. Outer shell; 11. Shell body; 12. Cover; 13. Receiving cavity; 14. Air inlet; 15. Air outlet; 16. Rotation limiting groove; 17. Closing part; 18. Annular groove;

[0041] Impeller assembly 2; Impeller 20; First-stage impeller 20a; Second-stage impeller 20b; Impeller inlet 201; Impeller outlet 202; First-stage impeller outlet 202a; Second-stage impeller outlet 202b; Impeller duct 203; Duct inlet 204; Sub-impeller outlet 205; Blade 21; Wheel cover 22; Wheel disc 23;

[0042] First guide element 3; guide air duct 301; first guide element body 302; guide rib 303; first extension section 306; second extension section 307; connecting section 308; limiting external protrusion 309; first guide element through hole 310; support column through hole 311; limiting groove 312; first limiting groove 313; second limiting groove 314; third limiting groove 315; first limiting sub-groove 316; second limiting sub-groove 317; mounting surface 318; first guide element mounting part 319;

[0043] Second guide element 4; Second guide element body 41; Second guide element body guide surface 411; Second guide element body pressing surface 412; Second guide element mounting part 42; Upstream transition air duct 43

[0044] Downstream transition duct 5,

[0045] 6 diffuser; 61 exhaust duct;

[0046] Drive component 7; Output shaft 71;

[0047] Seal 8; First seal 81; Second seal 82;

[0048] Bearing housing 9; main body 91; bearing mounting groove 92; bearing housing through hole 93; outer ring 94; connecting part 95; first connecting segment 951; second connecting segment 952; support column 96;

[0049] First bearing 10. Detailed Implementation

[0050] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0051] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0052] The following is a reference appendix. Figures 1-17A fan assembly 100 according to a first aspect embodiment of the present invention is described. The fan assembly 100 can be used in a vacuum cleaner, which can be a handheld vacuum cleaner, without specific limitations.

[0053] like Figures 1-3 As shown, the fan assembly 100 according to an embodiment of the present invention includes: a housing 1, an impeller assembly 2, a first guide member 3, and a drive member 7.

[0054] Specifically, at least a portion of the impeller assembly 2 is housed within the outer casing 1. That is, the impeller assembly 2 can be completely contained within the outer casing 1, providing better protection for the impeller assembly 2 and thus improving its anti-interference capability and stability. The impeller assembly 2 includes multiple impellers 20 arranged in series in the airflow direction of the fan assembly 100. In other words, when airflow passes through the fan assembly 100, it will sequentially flow through multiple impellers 20. It is understood that the airflow can achieve a significant pressurization effect when passing through the impellers 20. Therefore, the airflow undergoes multiple pressurizations as it flows through the multiple impellers 20, allowing the multiple impellers 20 to effectively increase the vacuum level inside the outer casing 1 at the same rotational speed. This increases the pressure difference between the outside and inside of the fan assembly 100, allowing outside air to enter the outer casing 1 more quickly, thereby increasing the suction power of the fan assembly 100 and ultimately improving the vacuum cleaner's cleaning efficiency.

[0055] like Figure 3 As shown, the first guide member 3 is adapted to guide the airflow from the upstream impeller 20 to the downstream impeller 20. Here, "upstream" and "downstream" refer to their positions relative to the first guide member 3 in the airflow direction of the fan assembly 100. That is, the first guide member 3 is located downstream of the airflow from the upstream impeller 20, and the downstream impeller 20 is also located downstream of the airflow from the first guide member 3. Therefore, the first guide member 3 can effectively adjust the airflow from the upstream impeller 20, such as adjusting the airflow angle, so that after adjustment, the airflow from the upstream impeller 20 can flow in a certain direction to the downstream impeller 20, thereby effectively reducing airflow loss and improving the aerodynamic performance of the fan assembly 100.

[0056] Furthermore, the diameter of the first guide member 3 decreases in the direction from the upstream impeller 20 to the downstream impeller 20. That is, the diameter of the end of the first guide member 3 adjacent to the upstream impeller 20 is larger than the diameter of the end of the first guide member 3 adjacent to the downstream impeller 20. This allows for a better reduction in the radial dimension of the first guide member 3, thereby reducing the radial dimension of the fan assembly 100. This results in a smaller radial dimension occupied by the fan assembly 100 within the vacuum cleaner and a lighter weight for the first guide member 3, facilitating a lightweight design of the fan assembly 100.

[0057] like Figure 3 As shown, the drive component 7 can be used to drive the impeller 20 to rotate. That is, the drive component 7 is connected to multiple impellers 20 in a transmission manner. Therefore, the speed of the impeller 20 can be controlled by controlling the power of the drive component 7, thereby accurately adjusting the suction force of the fan assembly 100.

[0058] According to some embodiments of the present invention, such as Figure 3 and Figure 14 As shown, multiple impellers 20 are arranged coaxially along the axial direction of the fan assembly 100. That is, the axes of the multiple impellers 20 are located on the same straight line, which effectively reduces the radial space occupied by the impeller assembly 2, thus facilitating a reduction in the radial dimension of the fan assembly 100 and enabling a lightweight design for the vacuum cleaner. Furthermore, the output shaft 71 of the drive component 7 can be coaxially arranged with the multiple impellers 20, allowing the output shaft 71 of the drive component 7 to simultaneously drive multiple impellers 20. This reduces the number of drive components 7, saving space and further reducing the size of the fan assembly 100, thus contributing to a lightweight design for the vacuum cleaner with low cost.

[0059] Furthermore, when multiple impellers 20 are fixedly connected to the output shaft 71 of the same drive unit 7, under the condition that the drive unit 7 rotates at the same speed, the pressurization of the airflow by the multiple impellers 20 can create a high vacuum within the fan assembly 100, thereby increasing the suction power of the fan assembly 100 and thus improving the vacuum cleaner's dust collection efficiency. Therefore, compared to fans in related technologies, under the same suction power conditions, the drive unit 7 has lower power consumption, meaning the output shaft 71 rotates at a slower speed. This allows for better control of noise caused by the rotation of the output shaft 71, while also reducing the power consumption of the fan assembly 100, thus improving the user experience of the vacuum cleaner.

[0060] In some embodiments of the present invention, the impeller 20 has an impeller inlet 201 extending along the axial direction of the fan assembly 100 and an impeller outlet 202 located on the outer periphery of the impeller 20. That is, under the drive of the drive member 7, the airflow can enter the interior of the impeller 20 through the impeller inlet 201, that is, the airflow at the impeller inlet 201 flows along the axial direction of the fan assembly 100, and is discharged along the radial direction of the fan assembly 100 through the impeller outlet 202. In other words, the impeller 20 can effectively adjust the axial air intake to radial air output.

[0061] According to some embodiments of the present invention, reference Figure 5 and Figure 6 The impeller 20 includes a cover 22, a disk 23, and multiple blades 21. Specifically, an impeller inlet 201 is formed on the cover 22, which opens along the axial direction of the impeller 20. The disk 23 and the cover 22 are arranged opposite to each other and spaced apart along the axial direction of the impeller 20, defining an impeller duct 203 between the disk 23 and the cover 22. The inner end of the impeller duct 203 in the radial direction can communicate with the impeller inlet 201, and the outer end of the impeller duct 203 in the radial direction forms an impeller outlet 202. At this time, the impeller duct 203 is formed as an annular shape, and when the airflow flows through the impeller duct 203... The airflow is roughly radial from the inside out, but the specific airflow direction is related to the shape of the blades 21. Multiple blades 21 are spaced apart in the air duct along the circumference of the impeller inlet 201. Each blade 21 can form an arc that is radially curved relative to the impeller 20. Any two adjacent blades 21 in the circumferential direction, together with the wheel cover 22 and the wheel disk 23, define the sub-impeller outlet 205. In other words, multiple sub-impeller outlets 205 together form the impeller outlet 202, so that the impeller 20 can uniformly discharge air in all directions.

[0062] Furthermore, the first guide member 3 is adapted to guide the airflow from the impeller outlet 202 on the upstream side to flow at least along the axial direction of the fan assembly 100 towards the impeller inlet 201 on the downstream side. That is, the first guide member 3 is adapted to adjust the radial airflow from the impeller 20 on the upstream side to at least partially flow along the axial direction. Specifically, the first guide member 3 can guide the airflow from the impeller outlet 202 on the upstream side to be entirely adjusted to flow along the axial direction; or the airflow from the impeller outlet 202 on the upstream side can be adjusted after passing through the first guide member 3 to form a partially flowing airflow along the axial direction of the fan assembly 100. Understandably, the impeller inlet 201 on the downstream side extends along the axial direction of the fan assembly 100, so that the airflow flowing along the axial direction of the fan assembly 100 after being adjusted by the first guide member 3 can enter the impeller inlet 201 on the downstream side more smoothly. This can better avoid the air field disturbance caused by the airflow direction not being consistent with the impeller inlet 201 direction, thereby better reducing gas flow loss and improving the aerodynamic performance of the fan assembly 100.

[0063] According to some embodiments of the present invention, reference Figure 3 The first guide element 3 and the inner wall of the outer casing 1 define a guide air duct 301. The guide air duct 301 is arc-shaped and deflects towards the axial direction of the fan assembly 100 in the direction from the impeller 20 on the upstream side to the impeller 20 on the downstream side. That is, when the gas flows through the guide air duct 301 towards the impeller 20 on the downstream side, the angle between the gas flow direction and the axial direction of the fan assembly 100 gradually decreases. In other words, the arc-shaped guide air duct 301 can effectively deflect the airflow angle, so that the airflow through the first guide element 3 can flow towards the impeller 20 on the downstream side in a certain direction. Therefore, the deflection angle of the guide duct 301 can be controlled according to the air inlet angle of the impeller 20 on the downstream side, so that the airflow through the first guide member 3 can flow more smoothly to the impeller 20 on the downstream side. This can better avoid the air field disturbance caused by the airflow direction not being consistent with the impeller inlet 201 direction, thereby better reducing gas flow loss and improving the aerodynamic performance of the fan assembly 100.

[0064] The guide duct 301 has a guide inlet and a guide outlet at both ends. The opening direction of the guide inlet is parallel to the opening direction of the impeller outlet 202 of the upstream impeller 20, and the opening direction of the guide outlet is parallel to the opening direction of the impeller inlet 201 of the downstream impeller 20. The guide duct 301 is arc-shaped, meaning that the guide inlet can open approximately along the radial direction of the first-stage impeller 20a, and the guide outlet can open approximately along the axial direction of the second-stage impeller 20b. The guide duct 301 can change the airflow from the first-stage impeller outlet 202a from radial to axial and deliver it to the second-stage impeller 20b. In this way, the airflow inside the fan assembly 100 can be made more efficient and smooth.

[0065] According to some embodiments of the present invention, the maximum diameter *a* of the first guide member 3 and the diameter *b* of the upstream impeller 20 satisfy 1.05 ≤ *a / b* ≤ 1.2. That is, the ratio of the maximum diameter *a* of the first guide member 3 to the diameter *b* of the upstream impeller 20 is controlled between 1.05 and 1.2. For example, the ratio of the maximum diameter *a* of the first guide member 3 to the diameter *b* of the upstream impeller 20 can be 1.05, 1.1, 1.15, 1.2, etc., without specific limitations. In other words, the diameter of the end of the first guide member 3 adjacent to the upstream impeller 20 is larger than the diameter of the upstream impeller 20, meaning the outer peripheral wall of the first guide member 3 protrudes beyond the outer peripheral wall of the upstream impeller 20. Therefore, the portion of the first guide member 3 extending beyond the outer peripheral wall of the upstream impeller 20 can better receive the airflow from the upstream impeller 20, thereby ensuring the adjustment effect of the first guide member 3 on the airflow direction.

[0066] According to some embodiments of the present invention, the minimum diameter c of the first guide member 3 satisfies c = d with the inner diameter d of the impeller inlet 201 of the downstream impeller 20. That is, the diameter of the end of the first guide member 3 near the downstream impeller 20 is the same as the diameter of the impeller inlet 201 of the downstream impeller 20. Therefore, the end of the first guide member 3 near the downstream impeller 20 can be aligned with the impeller inlet 201 of the downstream impeller, which helps to reduce gas flow loss.

[0067] According to some embodiments of the present invention, reference Figure 7 and Figure 8 The first guide element 3 includes a first guide element body 302 and a plurality of guide ribs 303 spaced apart along the outer peripheral wall of the first guide element body 302. The end of the guide rib 303 away from the first guide element body 302 abuts against the inner surface of the outer shell 1, thereby defining a guide air channel 301 between two adjacent guide ribs 303, the first guide element body 302, and the inner surface of the outer shell 1. Thus, by cooperating with the outer shell 1, the first guide element 3 can form a plurality of guide air channels 301 on the outer peripheral side of the first guide element 3, so that the air outlet of the impeller 20 on the upstream side can flow through the plurality of guide air channels 301 toward the impeller 20 on the downstream side. While ensuring the effect of adjusting the flow direction of the gas, the air outlets at multiple positions in the radial direction of the impeller 20 on the upstream side can all pass through the guide air channels 301, and then, under the guidance of the guide air channels 301, flow toward the impeller 20 on the downstream side in a certain direction, thereby ensuring the guiding efficiency of the first guide element 3. In addition, the first air guide 3 has multiple air outlet positions in the circumferential direction, which makes the air outlet of the first air guide 3 more uniform and helps to ensure the stability of the air field.

[0068] Further, refer to Figure 8 The guide rib 303 extends in an arc shape, and its deflection angle relative to the axial direction of the fan assembly 100 decreases in the direction from the upstream impeller 20 to the downstream impeller 20. Therefore, when gas flows through the guide duct 301 towards the downstream impeller 20, the angle between the gas flow direction and the axial direction of the fan assembly 100 gradually decreases under the guidance of the guide rib 303. In a specific example, the end of the guide rib 303 away from the upstream impeller 20 extends along the axial direction of the fan assembly 100, allowing at least a portion of the airflow through the guide duct 301 to flow along the axial direction of the fan assembly 100 towards the downstream impeller 20. This effectively avoids airflow turbulence caused by the exhaust turbulence of the upstream impeller 20, thereby reducing gas flow losses and improving the aerodynamic performance of the fan assembly 100.

[0069] According to some embodiments of the present invention, the guide rib 303 may include a first guide rib (not shown) and a second guide rib (not shown), wherein the extension length of the first guide rib is greater than the extension length of the second guide rib, and the first guide rib and the second guide rib are alternately arranged along the outer peripheral wall of the first guide body 302. That is, in the circumferential direction of the first guide body 302, a second guide rib is provided between every two adjacent first guide ribs, and a first guide rib is provided in front of every two adjacent second guide ribs, and a guide air duct 301 is defined between adjacent first guide ribs and second guide ribs. Thus, while ensuring the guiding effect on the airflow, the weight of the first guide rib 3 can be reduced, and the production materials of the first guide rib 3 can be saved, which is conducive to realizing the lightweight design of the fan assembly 100 and the low cost.

[0070] Optionally, the first and second guide ribs extend in the same direction. This ensures that the airflow direction in the airflow channel between the first and second guide ribs is consistent, thus ensuring that the airflow exits in the same direction when it passes through the guide duct 301, thereby avoiding losses caused by airflow turbulence and improving the performance of the fan assembly 100.

[0071] Optionally, one end of the impeller 20 adjacent to the upstream side of the first guide rib and one end of the impeller 20 adjacent to the upstream side of the second guide rib are in the same plane. That is, the air inlets 14 of the multiple guide ducts 301 are in the same plane, which can better ensure that the air outlet of the impeller 20 on the upstream side can enter the multiple guide ducts 301 evenly, which is beneficial to improving the stability of gas flow.

[0072] Furthermore, the distance between the end of the first guide rib away from the upstream impeller 20 and the upstream impeller 20 is greater than the distance between the end of the second guide rib away from the upstream impeller 20 and the upstream impeller 20. It can be understood that the first guide member 3 is inverted conical. Therefore, by making the extension length of the second guide rib less than the extension length of the first guide rib, the airflow between the first and second guide ribs on the side near the guide rib 303 away from the upstream impeller 20 enters between two adjacent first guide ribs. This allows for better adaptation to the inverted conical first guide member 3, thereby maintaining the width of the outlet 15 of the guide duct 301 and effectively avoiding airflow loss caused by narrowing of the guide duct 301.

[0073] Optionally, the length f of the second guide rib and the length g of the first guide rib satisfy 0.3 ≤ f / g ≤ 0.7. That is, the length ratio of the second guide rib to the first guide rib is controlled between 0.3 and 0.7. For example, the length ratio of the second guide rib to the first guide rib can be 0.3, 0.4, 0.5, 0.6, 0.7, etc., without specific restrictions. When the length ratio of the second guide rib to the first guide rib is too small, the length of the second guide rib is too small, making the airflow duct 301 between the first and second guide ribs too short, which is detrimental to the airflow guiding effect. When the length ratio of the second guide rib to the first guide rib is too large, the length of the second guide rib is too large, making it impossible for the first and second guide ribs to adapt to the shape of the first guide component 3. Therefore, by controlling the length ratio of the second guide rib to the first guide rib between 0.3 and 0.7, the airflow loss caused by the narrowing of the guide duct 301 can be better avoided while ensuring the gas flow guiding effect.

[0074] Optionally, the guide rib 303 has a first extension 306 adjacent to the upstream side of the impeller 20, a second extension 307 adjacent to the downstream side of the impeller 20, and a connecting section 308 connecting the first extension 306 and the second extension 307. The thickness of the first extension 306 and the second extension 307 decreases in the direction extending away from the connecting section 308. That is, in the extension direction of the guide rib 303, the thickness at both ends is less than the thickness at the middle position of the first guide member 3. Therefore, when the airflow from the upstream impeller 20 flows into the guide duct 301, the thickness of the end of the first extension 306 away from the connecting section 308 is smaller, which can better reduce gas flow resistance and help reduce gas flow loss.

[0075] Furthermore, the second extension section 307 has a smaller thickness in the direction away from the connecting section 308, which increases the spacing between two adjacent guide ribs 303 in the direction away from the upstream impeller 20. This can better solve the problem of the gradual reduction of the guide duct 301 caused by the inverted cone shape of the first guide body 302, thereby better reducing airflow loss.

[0076] Optionally, a limiting protrusion 309 is provided on the outer peripheral wall of the first flow guide body 302, and a rotation limiting groove 16 is formed on the inner surface of the outer shell 1 to cooperate with the limiting protrusion 309. That is, by cooperating with the limiting protrusion 309 and the rotation limiting groove 16, the limiting protrusion 309 is placed in the rotation limiting groove 16, so that the first flow guide 3 is fixed relative to the outer shell 1, preventing the first flow guide 3 from rotating relative to the outer shell 1, so as to ensure the flow guiding effect of the first flow guide 3.

[0077] Further, refer to Figure 8Multiple limiting protrusions 309 and rotation limiting grooves 16 are provided, with the multiple limiting protrusions 309 spaced apart along the outer peripheral wall of the first guide body 302. This improves the fixing effect of the outer shell 1 on the first guide 3, thereby ensuring the guiding effect of the first guide 3. In a specific example, the limiting protrusions 309 extend along the axial direction of the fan assembly 100. This allows the limiting protrusions 309 to be inserted into the rotation limiting grooves 16 along the axial direction of the fan assembly 100, reducing the assembly difficulty of the first guide 3.

[0078] Optionally, at least a portion of the limiting protrusion 309 is disposed on the guide rib 303. This allows the guide rib 303 and the limiting protrusion 309 to share a common structure, which can save material input and reduce the weight of the first guide member 3. Furthermore, it can effectively reduce the resistance of the limiting protrusion 309 to the airflow within the guide duct 301, thereby reducing airflow loss and improving the performance of the fan assembly 100.

[0079] Among them, the guide rib 303 can be an integral structure, that is, the first guide body 302, the guide rib 303 and the limiting external protrusion 309 can be processed by integral molding. The integral molding structure can not only ensure the structural and performance stability of the first guide body 302, the guide rib 303 and the limiting external protrusion 309, but also facilitate molding and manufacturing. In addition, it eliminates unnecessary assembly parts and connection processes, which greatly improves the assembly efficiency of the first guide body 302, the guide rib 303 and the limiting external protrusion 309, and ensures the connection reliability of the first guide body 302, the guide rib 303 and the limiting external protrusion 309. Furthermore, the integral molding structure has higher overall strength and stability, is more convenient to assemble and has a longer service life.

[0080] According to some embodiments of the present invention, reference Figure 3 and Figure 14 The outer casing 1 has a receiving cavity 13. An air inlet 14 and an air outlet 15 communicating with the receiving cavity 13 are formed on the outer casing 1. An upstream impeller 20 is positioned adjacent to the air inlet 14, and a downstream impeller 20 is positioned adjacent to the air outlet 15. The air inlet 14 communicates with the impeller inlet 201 of the upstream impeller 20, and the impeller outlet 202 of the downstream impeller 20 communicates with the air outlet 15. In other words, gas outside the fan assembly 100 enters the receiving cavity 13 through the air inlet 14, is pressurized by multiple impellers 20, and is then discharged through the air outlet 15. This effectively improves the vacuum level within the receiving cavity 13, increasing the pressure difference between the outside and inside of the fan assembly 100. This allows air from outside the fan assembly 100 to enter the outer casing 1 more quickly, thereby increasing the suction power of the fan assembly 100 and ultimately improving the vacuum cleaner's dust collection efficiency.

[0081] Optionally, the cavity wall of the receiving cavity 13 smoothly transitions to the inner peripheral wall of the impeller inlet 201 of the downstream impeller 20. That is, at the impeller inlet 201 of the downstream impeller 20, the inner diameter of the cavity wall of the receiving cavity 13 is the same as the inner diameter of the impeller inlet 201, which allows the airflow to flow into the impeller inlet 201 more stably, better avoids gas turbulence, and helps reduce airflow loss.

[0082] According to some embodiments of the present invention, reference Figure 3 and Figure 4 The fan assembly 100 also includes a seal 8, which fills the space between the outer periphery of the impeller inlet 201 and the cavity wall of the receiving cavity 13. This effectively prevents airflow from flowing through the gap between the impeller inlet 201 and the cavity wall of the receiving cavity 13, thereby reducing airflow loss and improving the aerodynamic performance of the fan assembly 100.

[0083] In addition, during the assembly of the impeller 20, the seal 8 can effectively prevent the impeller 20 from being directly damaged by collision with the housing 1. Furthermore, during the operation of the fan assembly 100, it can effectively prevent the resonance noise generated by the impeller 20 contacting the housing 1, which is beneficial to improving the overall structural stability of the fan assembly 100 and can effectively reduce resonance noise, thereby improving the quietness of the fan assembly 100.

[0084] In some embodiments, reference Figure 3 and Figure 14 The plurality of impellers 20 include at least: a primary impeller 20a and a secondary impeller 20b, wherein the primary impeller 20a is disposed adjacent to the air inlet 14, the first guide member 3 is disposed on the downstream side of the primary impeller 20a, the secondary impeller 20b is disposed on the downstream side of the first guide member 3, and the drive member 7 is disposed on the downstream side of the secondary impeller 20b.

[0085] In other words, in the airflow direction of the fan assembly 100, the airflow is first pressurized by the first-stage impeller 20a. The first guide vane 3 then directs the pressurized airflow from the first-stage impeller 20a to the second-stage impeller 20b, where it is further pressurized before being discharged from the fan assembly 100 through the impeller outlet 202 and the air outlet 15. This means the airflow undergoes two pressurizations within the fan assembly 100, which effectively improves the vacuum level within the receiving cavity 13, thus increasing the pressure difference between the outside and inside of the fan assembly 100. This allows air from outside the fan assembly 100 to enter the housing 1 more quickly, thereby increasing the suction power of the fan assembly 100 and ultimately improving the vacuum cleaner's suction efficiency. In a specific example, the output shaft 71 of the drive component 7 in this application rotates between 60,000 and 100,000 revolutions per minute, and the vacuum cleaner's suction power exceeds that of fans with 120,000 to 180,000 revolutions per minute in related technologies.

[0086] In some embodiments, the number of blades 21 of the first-stage impeller 20a is N1, the number of blades 21 of the second-stage impeller 20b is N2, and the number of guide ribs 303 of the first guide rib 3 is N3, wherein N3 > N1 and N3 > N2. That is, the number of guide ribs 303 of the first guide rib 3 is greater than the number of blades 21 of the adjacent impeller 20. This makes the flow area of ​​the sub-guide duct 301 defined by two adjacent guide ribs 303 in the circumferential direction smaller than the flow area of ​​the sub-impeller duct 203 defined by two adjacent blades 21 in the circumferential direction. As a result, the flow velocity of the air outlet 202 of the first-stage impeller 20a when flowing through the sub-guide duct 301 of the first guide rib 3 can be increased, which is beneficial to improving the flow efficiency of the airflow between the first-stage impeller 20a and the second-stage impeller 20b.

[0087] Furthermore, the number of blades 21 N1 of the first-stage impeller 20a and the number of blades 21 N2 of the second-stage impeller 20b satisfy the relationship: N1 > N2. Thus, since the first-stage impeller 20a is closer to the air inlet 14 of the outer casing 1 in the direction of airflow, setting the number of blades 21 of the first-stage impeller 20a to be more than the number of blades 21 of the second-stage impeller 20b is beneficial to improving the suction of the fan assembly 100. On the other hand, the number of blades 21 of the second-stage impeller 20b is relatively small, which makes the flow area of ​​the second-stage sub-impeller outlet 205 larger, which is beneficial to reducing the airflow resistance inside the outer casing 1, thereby improving the exhaust efficiency.

[0088] In some embodiments, the outer diameter of the first-stage impeller 20a is D11, and the distance between the first-stage impeller 20a and the second-stage impeller 20b along the axial direction of the fan assembly 100 is L1. The ratio of D11 to L1 is in the range of 1.27 ≤ D11 / L1 ≤ 1.87. For example, the ratio of D11 to L1 can be 1.27, 1.37, 1.47, 1.67, or 1.87. This avoids the situation where the ratio of D11 to L1 is too small, for example, less than 1.27, resulting in insufficient space between the first-stage impeller 20a and the second-stage impeller 20b for installing the first guide element 3, which would affect the efficiency of airflow through the guide channel. It also avoids the situation where the ratio of D11 to L1 is too large, for example, greater than 1.87, resulting in excessive distance between the first-stage impeller 20a and the second-stage impeller 20b, which would lead to greater air resistance when the airflow passes through the guide duct 301 and excessive airflow loss, thus reducing the suction of the fan assembly 100.

[0089] Furthermore, the outer diameter D11 of the first-stage impeller 20a is within the range of 37mm≤D11≤43mm. For example, the outer diameter D11 of the first-stage impeller 20a can be 37mm, 38mm, 40mm, 41mm or 43mm. This avoids the situation where the outer diameter of the first-stage impeller 20a is too large, for example, greater than 43mm, which would result in an excessively large radial dimension of the fan assembly 100 and occupy too much space, thus hindering the miniaturization and portability of the vacuum cleaner. It also avoids the situation where the outer diameter of the first-stage impeller 20a is too small, for example, less than 37mm, which would result in insufficient airflow from the first-stage impeller 20a and insufficient suction power from the vacuum cleaner.

[0090] According to some embodiments of the present invention, the outer diameter of the secondary impeller 20b is D21, and the distance between the primary impeller 20a and the secondary impeller 20b along the axial direction of the fan assembly 100 is L1. The ratio of D21 to L1 ranges from 1.27 to 1.87. For example, the ratio of D21 to L1 can be 1.27, 1.37, 1.47, 1.67, or 1.87. This avoids the ratio of D21 to L1 being too small. If the ratio is less than 1.27, the space between the first-stage impeller 20a and the second-stage impeller 20b for installing the first guide vane 3 is too small, affecting the efficiency of airflow through the guide channel. This also avoids the ratio of D21 to L1 being too large. For example, if the ratio is greater than 1.87, the distance between the first-stage impeller 20a and the second-stage impeller 20b is too large, resulting in greater air resistance when the airflow passes through the guide duct 301 and excessive airflow loss, thus reducing the suction of the fan assembly 100.

[0091] Furthermore, the outer diameter D21 of the secondary impeller 20b is in the range of 37mm≤D21≤43mm. For example, the outer diameter D21 of the secondary impeller 20b can be 37mm, 38mm, 40mm, 41mm or 43mm. This avoids the situation where the outer diameter of the secondary impeller 20b is too large, such as greater than 43mm, which would result in an excessively large radial dimension of the fan assembly 100 and occupy too much space, thus hindering the miniaturization and portability of the vacuum cleaner. It also avoids the situation where the outer diameter of the secondary impeller 20b is too small, such as less than 37mm, which would result in insufficient airflow from the secondary impeller 20b and consequently insufficient suction power in the vacuum cleaner.

[0092] In some embodiments, the distance between the first guide member 3 and the secondary impeller 20b along the axial direction of the fan assembly 100 is L2, and the distance between the first impeller 20a and the secondary impeller 20b along the axial direction of the fan assembly 100 is L1. The ratio of L2 to L1 is in the range of 0.13 ≤ L2 / L1 ≤ 0.26. For example, the ratio of L2 to L1 can be 0.13, 0.18, 0.2, 0.25, or 0.26. This avoids the first guide member 3 and the secondary impeller 20b being too small, for example, less than 0.13, which would cause problems. If the axial spacing of 0b in the fan assembly 100 is too small, the airflow in the guide duct 301 will have difficulty entering the impeller inlet 201 of the secondary impeller 20b, thus reducing the airflow efficiency. This also avoids the situation where the ratio of L2 to L1 is too large, for example, greater than 0.26, resulting in an excessively large axial spacing between the first guide element 3 and the secondary impeller 20b in the fan assembly 100 and the resulting reduction in the guiding effect of the first guide element 3. As a result, vortices are formed between the first guide element 3 and the secondary impeller 20b, further hindering airflow and increasing air volume loss.

[0093] According to some embodiments of the present invention, in the airflow direction, the cross-sectional area of ​​the impeller outlet 202 of the impeller 20 located on the upstream side is larger than the cross-sectional area of ​​the impeller outlet 202 of the impeller 20 located on the downstream side. That is, the cross-sectional area of ​​the impeller outlet 202 of the first-stage impeller 20a is larger than the cross-sectional area of ​​the impeller outlet 202 of the second-stage impeller 20b. For example, when the outer diameter of the first-stage impeller 20a and the outer diameter (i.e., the circumference) of the second-stage impeller 20b are the same, the width of the impeller outlet 202 of the first-stage impeller 20a along the impeller 20 axial direction can be set to be larger than the width of the impeller outlet 202 of the second-stage impeller 20b along the impeller 20 axial direction, so that the cross-sectional area of ​​the impeller outlet 202 of the first-stage impeller 20a is larger than the cross-sectional area of ​​the impeller outlet 202 of the second-stage impeller 20b. In this way, the airflow velocity after passing through the first-stage impeller 20a and the second-stage impeller 20b in sequence can be significantly increased, thereby increasing the wind force and increasing the suction power of the vacuum cleaner.

[0094] Furthermore, the outer diameter of the first-stage impeller 20a is D11, and the outer diameter of the second-stage impeller 20b is D21, where D11 = D21. In other words, the radial dimensions of the first-stage impeller 20a and the second-stage impeller 20b are the same. This allows the overall structure of the fan assembly 100 to maintain the same diameter at different positions along the axial direction, which is beneficial for miniaturizing the overall structure of the fan assembly 100 while ensuring that it can provide sufficient suction.

[0095] In some embodiments, the inner diameter of the first-stage impeller 20a is D12, and the value of D12 is in the range of 18mm ≤ D12 ≤ 21mm. For example, the inner diameter of the first-stage impeller 20a can be 18mm, 19mm, 20mm, or 21mm. The inner diameter of the second-stage impeller 20b is D22, and the value of D22 is in the range of 18mm ≤ D21 ≤ 21mm. For example, the inner diameter of the second-stage impeller 20b can be 18mm, 19mm, 20mm, or 21mm, and D12 ≥ D22. Here, the inner diameter of the first-stage impeller 20a being D12 means that the inner diameter of the impeller inlet 201 of the first-stage impeller 20a is D12, and the inner diameter of the second-stage impeller 20b being D22 means that the inner diameter of the second-stage impeller 20b is D12. The inner diameter of the impeller inlet 201 is D22. The opening area of ​​the impeller inlet 201 of the first-stage impeller 20a is larger than that of the impeller inlet 201 of the second-stage impeller 20b. Since the first-stage impeller 20a is closer to the air inlet 14 of the outer casing 1, setting the opening area of ​​the impeller inlet 201 of the first-stage impeller 20a to be larger than that of the impeller inlet 201 of the second-stage impeller 20b is beneficial to increasing the air intake of the impeller assembly 2. At the same time, with a certain air volume flowing through the first-stage impeller 20a and the second-stage impeller 20b, the smaller opening area of ​​the impeller inlet 201 of the second-stage impeller 20b further increases the airflow velocity when flowing through the second-stage impeller 20b, thereby improving the suction power of the vacuum cleaner. In addition, setting the inner diameter of the first-stage impeller 20a and the second-stage impeller 20b to a range of 18mm-21mm is beneficial to achieving radial miniaturization of the overall structure of the fan assembly 100.

[0096] According to some embodiments of the present invention, the width of the first-stage impeller outlet 202a of the first-stage impeller 20a is B11, and the width of the second-stage impeller outlet 202b of the second-stage impeller 20b is B21, wherein B11>B21. Thus, the airflow velocity after sequentially passing through the first-stage impeller 20a and the second-stage impeller 20b can be significantly increased, thereby increasing the airflow and thus increasing the suction power of the vacuum cleaner. It should be noted that the width of the impeller outlet 202 here refers to the width of the impeller outlet 202 along the axial direction of the impeller 20, that is, the distance between the outer edge of the wheel cover 22 and the outer edge of the wheel disk 23 in the axial direction of the impeller 20.

[0097] Furthermore, the width B11 of the primary impeller outlet 202a and the width B21 of the secondary impeller outlet 202b satisfy the following relationship: B21=a1*B11, where 0.6≤a1≤0.9. For example, the value of a1 can be 0.6, 0.7, 0.8, or 0.9. This prevents the width of the secondary impeller outlet 202b from being too small when the value of a1 is too small, such as less than 0.6, making it difficult for the airflow to exit through the secondary impeller outlet 202b. It also prevents the width of the secondary impeller outlet 202b from increasing too much when the value of a1 is too large, such as greater than 0.9, which would fail to meet the requirement of increasing the airflow velocity. In summary, setting the value of a1 to 0.6≤a≤0.9 can better meet the needs of airflow efficiency, thereby ensuring that the suction power of the vacuum cleaner is large enough.

[0098] Furthermore, an air duct inlet 204 is formed at the inner end of the impeller air duct 203 along the radial direction. The width of the primary air duct inlet of the primary impeller 20a is B12, and the width of the secondary air duct inlet of the secondary impeller 20b is B22, wherein B12>B22. In this way, the airflow velocity can be significantly increased after passing through the primary impeller 20a and the secondary impeller 20b in sequence, thereby increasing the airflow force to increase the suction power of the vacuum cleaner.

[0099] In some embodiments, the width B12 of the primary air duct inlet and the width B22 of the secondary air duct inlet satisfy the relationship: B22=c1*B12, where 0.8≤c1<1. For example, the value of c1 can be 0.8 or 0.9, etc. This can prevent the flow area of ​​the secondary impeller 20b air duct from being too small and the airflow from being too obstructed when the value of c1 is too small, such as less than 0.8. It can also prevent the flow area of ​​the secondary impeller 20b air duct from being too large, such as greater than 1, which would result in the secondary impeller 20b having an insignificant or no effect on increasing the airflow velocity.

[0100] According to some embodiments of the present invention, the number of blades 21 in each impeller 20 is in the range of 7 ≤ N ≤ 13. For example, the number of blades 21 in each impeller 20 can be 7, 8, 10, 12 or 13. Thus, when the vacuum cleaner is a handheld vacuum cleaner, since the volume of the fan assembly 100 of the handheld vacuum cleaner is small, that is, the radial dimension of the impeller 20 is relatively small, setting the number of blades 21 of the impeller 20 to 7-13 can prevent the impeller 20 from driving the airflow when the number of blades 21 is too small, for example less than 7, and can also avoid the airflow resistance and noise from being too large when the number of blades 21 is too large, for example more than 13.

[0101] In some embodiments, the number of blades 21 of the plurality of impellers 20 in the air flow direction is reduced. That is, the number of blades 21 of the secondary impeller 20b is less than the number of blades 21 of the primary impeller 20a. Thus, the air resistance of the air flow channel inside the housing 1 can be gradually reduced, which is beneficial to improving the exhaust efficiency and further beneficial to improving the dust suction efficiency of the vacuum cleaner.

[0102] Furthermore, the number of blades 21 of the primary impeller 20a is N1, and the value range of N1 is: 8 ≤ N1 ≤ 12. For example, the value of the number of blades 21 of the primary impeller 20a, N1, can be 8, 9, 10, 11, or 12; the number of blades 21 of the secondary impeller 20b is N2, and the value range of N2 is: 7 ≤ N2 ≤ 11. For example, the value of the number of blades 21 of the secondary impeller 20b, N2, can be 7, 8, 9, 10, or 12, and N1 and N2 satisfy: N2 < N1. Thus, the air resistance of the air flow channel inside the housing 1 can be gradually reduced, which is beneficial to improving the exhaust efficiency and further beneficial to improving the dust suction efficiency of the vacuum cleaner.

[0103] According to some embodiments of the present invention, the primary impeller 20a and the secondary impeller 20b are located on the same side of the motor assembly along the axis. Thus, the distance between the primary impeller 20a and the secondary impeller 20b can be shortened, thereby shortening the length of the air flow path and helping to reduce the wind loss.

[0104] In some embodiments, the distance between the primary impeller 20a and the secondary impeller 20b along the axis of the fan assembly 100 is L1, and the width of the primary impeller outlet 202a of the primary impeller 20a is B11. B11 and L1 satisfy the relationship: 0.14 ≤ B11 / L1 ≤ 0.17. For example, the value of B11 / L1 can be 0.14, 0.15, 0.16, or 0.17. Thus, it can avoid that when B11 / L1 is too small, the width of the primary impeller outlet 202a is too small, resulting in too large air resistance at the primary impeller outlet 202a and increasing the air volume loss, and it can also avoid that when B11 / L1 is too large, for example, greater than 0.17, the axial length of the fan assembly 100 is relatively large, which is not conducive to miniaturization.

[0105] Furthermore, the distance between the first-stage impeller 20a and the second-stage impeller 20b along the axial direction of the fan assembly 100 is L1, and the width of the second-stage impeller outlet 202b of the second-stage impeller 20b is B21. B21 and L1 satisfy the relationship: 0.14≤B21 / L1≤0.17. For example, the value of B21 / L1 can be 0.14, 0.15, 0.16 or 0.17. In this way, it can be avoided that if B21 / L1 is too small, the width of the second-stage impeller outlet 202b will be too small, resulting in excessive wind resistance at the second-stage impeller outlet 202b and increased air volume loss. It can also be avoided that if B21 / L1 is too large, for example, greater than 0.17, the axial length of the fan assembly 100 will be too large, which is not conducive to miniaturization.

[0106] Furthermore, multiple impellers 20 are disposed within the housing 1. The ratio of the radially relative diameter of the inner wall of the housing 1 to the outer diameter of the corresponding impeller 20's disk 23 to the outer diameter of the disk 23 ranges from 1.25 to 1.43. In other words, the ratio of the radially relative diameter of the inner wall of the housing 1 to the outer diameter of the first-stage impeller 20a's disk 23 to the outer diameter of the first-stage impeller 20a can be 1.25, 1.3, 1.35, 1.4, or 1.43. Similarly, the ratio of the radially relative diameter of the inner wall of the housing 1 to the outer diameter of the first-stage impeller 20a's disk 23 to the outer diameter of the first-stage impeller 20a can be 1.25, 1.3, 1.35, 1.4, or 1.43. The ratio of the diameter of the inner wall of the casing 1 relative to the radial position of the disk 23 of the secondary impeller 20b to the outer diameter of the disk 23 of the secondary impeller 20b is in the range of 1.25-1.43. For example, the ratio of the diameter of the inner wall of the casing 1 relative to the radial position of the disk 23 of the secondary impeller 20b to the outer diameter of the disk 23 of the secondary impeller 20b can be 1.25, 1.3, 1.35, 1.4 or 1.43. In this way, the distance between each disk 23 and the inner wall of the casing 1 can be too small, which would lead to increased wind resistance and increased air volume loss. At the same time, the distance between each disk 23 and the inner wall of the casing 1 can be too large, which would lead to an increase in the radial dimension of the fan assembly 100 and would be detrimental to the miniaturization of the fan assembly 100.

[0107] According to some embodiments of the present invention, the impeller outlet 202 includes a plurality of sub-impeller outlets arranged circumferentially along the impeller 20. The cross-sectional area of ​​the sub-impeller outlet of the upstream impeller 20 is larger than that of the sub-impeller outlet of the downstream impeller 20. That is, the impeller outlet 202 of each impeller 20 can be composed of a plurality of sub-impeller outlets arranged circumferentially along the impeller 20. Each sub-impeller outlet can be defined by two adjacent blades 21 and a wheel 23. The cross-sectional area of ​​the first-stage sub-impeller outlet of the first-stage impeller 20a is larger than that of the second-stage sub-impeller outlet of the second-stage impeller 20b. In this way, the overall layout of the fan assembly 100 is conducive to increasing the wind speed, thereby making the suction power of the vacuum cleaner stronger.

[0108] According to some embodiments of the present invention, reference Figure 11 and Figure 15 The fan assembly 100 may further include a second guide member 4. The second guide member 4 is disposed between the first guide member 3 and the impeller 20 located upstream of the first guide member 3, so as to guide the air outlet 202 of the impeller 20 on the upstream side to the guide duct 301. In other words, the second guide member 4 is disposed between the first guide member 3 and the first-stage impeller 20a. The second guide member 4 can guide the air outlet 202a of the first-stage impeller to the guide duct 301 defined by the first guide member 3 and the inner wall of the outer casing 1. Thus, by providing the second guide member 4, it is beneficial to reduce the wind resistance between the first-stage impeller outlet 202a and the guide duct 301, reduce wind power loss, and thereby improve the air circulation efficiency of the fan assembly 100.

[0109] According to some embodiments of the present invention, the second guide member 4 can be constructed as an annular shape, and the second guide member 4 is sleeved on the outer side of the impeller 20 on the upstream side. That is, the second guide member 4 can be sleeved on the outer side of the first-stage impeller 20a, for example... Figure 15 As shown, the second guide element 4 is formed as a second guide ring. The second guide ring is sleeved on the outer periphery of the first stage impeller outlet 202a to guide the airflow from the first stage impeller outlet 202a to the guide airflow duct 301. In this way, the second guide element 4 can guide the airflow from the first stage impeller outlet 202a at any position in the circumferential direction. At the same time, the structure is simple and easy to manufacture.

[0110] In some embodiments, reference Figure 11 The second guide member 4 and the impeller 20 on the upstream side are separated in the radial direction to form an annular micro gap. That is, in the radial direction of the impeller 20, the second guide member 4 and the first-stage impeller 20a are separated and form an annular micro gap. This can avoid the second guide member 4 from interfering with the movement of the first-stage impeller 20a, and at the same time facilitate assembly.

[0111] According to some embodiments of the present invention, the first guide member 3 has a mounting surface 318, which is the surface of the impeller 20 near the upstream side of the first guide member 3, and the second guide member 4 is mounted on the mounting surface 318, for example... Figure 1 As shown, the diameter of the mounting surface 318 is larger than the diameter of the first-stage impeller 20a, so that the portion of the mounting surface 318 that extends beyond the impeller 20 in the radial direction forms an installation space. The second guide member 4 can be installed in the installation space of the mounting surface 318. This makes the installation of the second guide member 4 more stable and also helps to improve the space utilization of the fan assembly 100. At the same time, it also facilitates the second guide member 4 to guide the airflow at the outlet 202a of the first-stage impeller.

[0112] Furthermore, the second guide member 4 includes: a second guide member body 41 and a second guide member mounting part 42, wherein the second guide member mounting part 42 is disposed on the second guide member body 41, and a first guide member mounting part 319 is formed on the mounting surface 318. The second guide member mounting part 42 and the first guide member mounting part 319 are detachably connected, which facilitates the installation and disassembly of the second guide member 4 and the first guide member 3. For example, the first guide member mounting part 319 and the second guide member mounting part 42 can be plugged in or snapped together. Of course, the specific connection method of the first guide member mounting part 319 and the second guide member mounting part 42 is not limited here. The connection method of the first guide member mounting part 319 and the second guide member mounting part 42 can be reasonably selected according to actual needs.

[0113] Furthermore, refer to Figure 11 The first guide element mounting portion 319 is configured as a first mounting groove, and the second guide element mounting portion 42 is configured as a second mounting protrusion. For example, the second guide element mounting portion 42 can be formed by at least a radially protruding part of the surface of the second guide element body 41 facing the first guide element 3. The second mounting protrusion can be inserted into the first mounting groove, thus making the connection between the first guide element 3 and the second guide element 4 more stable and facilitating disassembly. Of course, the present invention is not limited to this. Alternatively, the first guide element mounting portion 319 can be formed as a first mounting protrusion, and the second guide element mounting portion 42 can be configured as a second mounting groove.

[0114] According to some embodiments of the present invention, the second guide member 4 includes a second guide member body 41. The second guide member body 41 has a second guide member body guiding surface 411 and a second guide member body pressing surface 412, wherein the second guide member body pressing surface 412 is fitted against the mounting surface 318, and the second guide member body guiding surface 411 is used to guide the airflow from the first stage impeller outlet 202a to the guide duct 301, for example... Figure 11 As shown, the second guide body pressing surface 412 and the mounting surface 318 are opposite each other along the axial direction of the first stage impeller 20a. At the same time, the second guide body pressing surface 412 and the second guide mounting part 42 are arranged radially inward and outward, and the second guide body pressing surface 412 is located on the radial inner side of the second guide mounting part 42. The second guide body pressing surface 412 and the second guide mounting part 42 are formed into a stepped structure. The second guide body guiding surface 411 faces the outer shell 1 and is formed into an arc surface. In this way, the second guide body pressing surface 412 helps the second guide 4 and the first guide 3 to cooperate stably. The second guide body guiding surface 411 can reduce wind resistance and reduce air volume loss while realizing air guidance.

[0115] Furthermore, the impeller outlet 202 of the upstream impeller 20 has a lower edge, and the inner circumference of the guide surface 411 of the second guide body extends to a position adjacent to the lower edge of the impeller outlet 202. The outer circumference of the guide surface 411 of the second guide body extends to the junction of the mounting surface 318 of the first guide 3 and the outer circumference of the first guide 3. In other words, the inner circumference of the guide surface 411 of the second guide body extends to a position adjacent to the edge of the disk 23 of the first stage impeller 20a, and the outer circumference of the guide surface 411 of the second guide body extends to the junction with the outer circumference of the first guide 3. In this way, the guide surface 411 of the second guide body can better guide the air outlet of the first stage impeller outlet 202a into the guide duct 301, reducing air volume loss.

[0116] Furthermore, the flow guide surface 411 of the second flow guide body is smoothly transitioned to the outer peripheral surface of the first flow guide 3. For example, the flow guide surface 411 of the second flow guide body can be tangent to the outer peripheral surface of the second flow guide 4, thereby further reducing the wind resistance at the connection between the flow guide surface 411 of the second flow guide body and the outer peripheral surface of the second flow guide 4, reducing air volume loss, and improving air outlet efficiency.

[0117] According to some embodiments of the present invention, reference Figure 11 The inner circumferential surface of the outer casing 1 has an upstream guide surface corresponding to the upstream side of the impeller 20. The upstream guide surface corresponds to the guide surface 411 of the second guide body and forms an upstream transition air duct 43 between them. The upstream transition air duct 43 connects the impeller outlet 202 and the guide inlet of the guide air duct 301, for example... Figure 11 As shown, the inner wall of the outer casing 1 adjacent to the first-stage impeller outlet 202a is formed as an upstream guide surface. The upstream guide surface is formed as an arc surface. An upstream transition air duct 43 is defined between the upstream guide surface and the guide surface 411 of the second guide body. One end of the upstream transition air duct 43 is connected to the first-stage impeller outlet 202a, and the other end is connected to the guide inlet of the guide air duct 301. Since both the upstream guide surface and the guide surface 411 of the second guide body are formed as arcs, the upstream transition air duct 43 is also formed as an arc. In this way, the upstream transition air duct 43 can reduce wind resistance and reduce air volume loss while realizing air guidance, which is conducive to improving air outlet efficiency.

[0118] Further, refer to Figure 11 The cross-sectional area of ​​the upstream transition duct 43 decreases from the impeller outlet 202 to the guide inlet of the guide duct 301. In other words, the cross-sectional area of ​​the upstream transition duct 43 can gradually decrease in the direction from the first-stage impeller outlet 202a to the guide duct 301. This helps to increase the air velocity and form a negative pressure inside the fan assembly 100, thereby increasing the suction power of the vacuum cleaner.

[0119] In a specific instance, such as Figure 1 and Figure 3 As shown, the first-stage impeller 20a, the first guide vane 3, and the second-stage impeller 20b of the fan assembly 100 are coaxially arranged in the axial direction. The output shaft 71 of the drive component 7 is fixedly connected to the first-stage impeller 20a and the second-stage impeller 20b, and rotatably connected to the first guide vane 3. This effectively reduces the axial space occupied by the impeller assembly 2, which is beneficial for reducing the axial dimension of the fan assembly 100 and achieving a lightweight design for the vacuum cleaner. Furthermore, the output shaft 71 of the drive component 7 can be coaxially arranged with multiple impellers 20, allowing the output shaft 71 of the drive component 7 to simultaneously drive multiple impellers 20. This reduces the number of drive components 7, saves space occupied by the drive components 7, and further reduces the size of the fan assembly 100, facilitating a lightweight design for the vacuum cleaner with low cost.

[0120] In some embodiments of the present invention, reference is made to Figure 2 The outer casing 1 includes a main body 11 and a cover 12. The main body 11 is adapted to cooperate with the cover 12 to define a receiving cavity 13. An air inlet 14 is formed on the cover 12. The main body 11 and the cover 12 are detachably connected. Thus, by removing the cover 12 from the main body 11, it is convenient to install the impeller assembly 2 and the like into the receiving cavity 13, thereby reducing the assembly difficulty of the fan assembly 100.

[0121] The cover 12 is placed on the first-stage impeller 20a, forming an annular groove 18 surrounding the air inlet 14. The annular groove 18 faces the first guide member 3, and the outer periphery of the impeller inlet 201 of the first-stage impeller 20a is located within the annular groove 18. Thus, by aligning the annular groove 18 with the impeller inlet 201 of the first-stage impeller 20a, the cover 12 and the first-stage impeller 20a can be quickly positioned, improving the assembly efficiency of the fan assembly 100. Furthermore, it allows all the airflow through the air inlet 14 to enter the first-stage impeller 20a, effectively preventing gas flow loss.

[0122] In a specific example, refer to Figure 2 and Figure 4 The cover 12 includes a cover body 121, a first bend 122 and a second bend 123. The upper end of the cover body 121 bends inward toward the air outlet 15 to form the first bend 122. The end of the first bend 122 away from the cover body 121 bends toward the first stage impeller 20a to form the second bend 123. The cover body 121, the first bend 122 and the second bend 123 together define an annular groove 18, that is, the second bend 123 defines an air inlet 14, so that the airflow can directly enter the impeller inlet 201 along the second bend 123.

[0123] According to some embodiments of the present invention, reference Figure 3 and Figure 4The seal 8 includes a first seal 81 and a second seal 82. The first seal 81 seals the gap between the annular groove 18 and the first-stage impeller 20a. That is, at least a portion of the first seal 81 is located within the annular groove 18, so as to better fill the gap between the cover 12 and the impeller inlet 201 of the first-stage impeller 20a. Figure 3 As shown, the second seal 82 is used to seal the gap between the outer periphery of the impeller inlet 201 of the secondary impeller 20b and the cavity wall of the receiving cavity 13. That is, the second seal 82 fills the gap between the outer periphery of the impeller outlet 202 of the secondary impeller 20b and the cavity wall of the receiving cavity 13. This effectively prevents airflow from flowing through the gaps between the primary impeller 20a, the secondary impeller 20b, and the cavity wall of the receiving cavity 13, thereby reducing airflow loss and improving the aerodynamic performance of the fan assembly 100. Furthermore, it effectively prevents resonance noise generated by the impeller 20 abutting against the housing 1.

[0124] According to some embodiments of the present invention, reference Figure 15 The fan assembly 100 also includes a first bearing 10, the outer ring of which is fixedly connected to the first guide member 3, and the output shaft 71 of the drive member 7 passes through the inner ring of the first bearing 10. Thus, while ensuring that the output shaft 71 of the drive member 7 can rotate relative to the first guide member 3, the first guide member 3 limits the first bearing 10, thereby effectively suppressing the eccentric oscillation of the output shaft 71 of the drive member 7, which is beneficial to improving the stability of the fan assembly 100.

[0125] Further, refer to Figure 15 The fan assembly 100 also includes a bearing housing 9, which is located between the first guide member 3 and the first bearing 10. Therefore, the bearing housing 9 can effectively buffer the force transmitted from the output shaft 71 of the drive member 7 to the first bearing 10, thereby reducing the interference of vibrations from the drive member 7 on the first guide member 3 and improving the stability of the fan assembly 100. The bearing housing 9 is detachably mounted on the first guide member 3, reducing the difficulty of bearing installation and facilitating subsequent maintenance.

[0126] Furthermore, refer to Figure 1 and Figure 3 The bearing housing 9 has a bearing mounting groove 92 for accommodating the first bearing 10, and the output shaft 71 of the drive member 7 passes through the first bearing 10. This significantly reduces the installation difficulty of the first bearing 10. Furthermore, in the airflow direction of the fan assembly 100, the distance between the bearing housing 9 and the upstream impeller 20 is not less than the distance between the first guide member 3 and the upstream impeller 20. That is, the distance between the bearing housing 9 and the upstream impeller 20 can be equal to the distance between the first guide member 3 and the upstream impeller 20, such as... Figure 3As shown, the upper end face of the first guide body 302 is on the same horizontal plane as the upper end face of the bearing seat 9; or the distance between the bearing seat 9 and the upstream impeller 20 is greater than the distance between the first guide 3 and the upstream impeller 20. It can be understood that the output shaft 71 of the drive component 7 is connected to the impeller 20 and rotatably connected to the first guide 3, allowing the impeller 20 to rotate relative to the first guide 3. This effectively avoids interference of the bearing seat 9 with the rotation of the impeller 20, thus improving the stability of the fan assembly 100. Furthermore, it effectively saves axial space in the fan assembly 100, resulting in a more rational layout.

[0127] A limiting groove 312 for accommodating the bearing housing 9 is formed on the axial end face of the first guide member 3 facing the upstream impeller 20. This effectively reduces the difficulty of installing and positioning the bearing housing 9, improves the assembly efficiency of the fan assembly 100, and ensures a secure connection between the bearing housing 9 and the first guide member 3. Furthermore, a first guide member through hole 310 is formed on the bottom wall of the limiting groove 312, and the output shaft 71 of the drive member 7 passes through the first guide member through hole 310. This allows for a rotatable connection between the output shaft 71 of the drive member 7 and the first guide member 3, and facilitates the transmission connection between the output shaft 71 of the drive member 7 and the upstream impeller 20 via the first guide member 3.

[0128] According to some embodiments of the present invention, reference Figure 3 and Figure 16 The bearing housing 9 may include a main body 91, an outer ring 94, and a connecting portion 95. Specifically, a bearing mounting groove 92 is formed on the main body 91, and the bottom wall of the bearing mounting groove 92 forms a bearing housing through hole 93 that is directly opposite to the first guide member through hole 310. That is, the first bearing 10 is disposed on the main body 91, and the output shaft 71 of the drive member 7 can pass through the bearing housing through hole 93 and cooperate with the bearing.

[0129] Furthermore, the outer ring portion 94 is located on the outer periphery of the main body portion 91, and is coaxially arranged with the main body portion 91. The two ends of the connecting portion 95 are respectively connected to the opposite sidewalls of the main body portion 91 and the outer ring portion 94. That is, the outer ring portion 94 is located radially outside the main body portion 91, one end of the connecting portion 95 is connected to the side of the outer ring portion 94 facing the main body portion 91, and the other end of the connecting portion 95 is connected to the outer periphery of the main body portion 91. Thus, the connecting portion 95 can connect the main body portion 91 and the outer ring portion 94, so that when the torque on the output shaft 71 of the drive member 7 is transmitted to the main body portion 91 through the bearing, the main body portion 91 can be dispersed to the outer ring portion 94 through the connecting portion 95. This can better avoid stress concentration at the position of the main body portion 91, and thus better prevent the force from being further transmitted to the first guide member 3, which is beneficial to improving the structural strength of the first guide member 3.

[0130] The main body 91, the outer ring 94, and the connecting part 95 are all embedded in the limiting groove 312. That is to say, the limiting groove 312 can better accommodate the main body 91, the outer ring 94, and the connecting part 95, so as to further improve the fixing strength of the first guide member 3 to the bearing seat 9.

[0131] Optionally, multiple connecting portions 95 are provided, and the multiple connecting portions 95 are arranged at intervals along the outer peripheral wall of the main body 91. Thus, the main body 91 is connected to the outer ring 94 through multiple connecting portions 95 on the outer peripheral wall, so that the torque acting on the main body 91 can be better distributed through multiple connecting portions 95, ensuring a firm connection between the main body 91 and the outer ring 94, and helping to improve the structural strength of the bearing housing 9.

[0132] According to some embodiments of the present invention, reference Figures 7-9 The limiting groove 312 includes a first limiting groove 313, a second limiting groove 314, and a third limiting groove 315. Specifically, the first limiting groove 313 extends along the axial direction of the fan assembly 100, and the main body 91 is accommodated in the first limiting groove 313. The bottom wall of the first limiting groove 313 forms a first guide through hole 310. The second limiting groove 314 extends along the circumferential direction of the fan assembly 100 and is formed into an annular shape. The outer ring 94 is accommodated in the second limiting groove 314. The third limiting groove 315 extends along the radial direction of the fan assembly 100, and both ends of the third limiting groove 315 are respectively connected to the first limiting groove 313 and the second limiting groove 314. The connecting part 95 is located in the third limiting groove 315.

[0133] Therefore, by limiting the connecting part 95 with the third limiting groove 315, the rotation of the main body 91 relative to the first limiting groove 313 and the rotation of the outer ring part 94 relative to the second limiting groove 314 can be effectively restricted, thereby effectively avoiding wear caused by relative movement between the bearing seat 9 and the first guide member 3. In addition, the difficulty of aligning the bearing seat 9 and the limiting groove 312 can be reduced, which is beneficial to improving the assembly efficiency of the fan assembly 100.

[0134] Furthermore, the third limiting groove 315 includes a first limiting sub-groove 316 and a second limiting sub-groove 317 arranged along the axial direction of the wind turbine assembly 100. At least a portion of the connecting portion 95 is located within the second limiting sub-groove 317. In the circumferential direction of the wind turbine assembly 100, the width of the first limiting sub-groove 316 is greater than the width of the second limiting sub-groove 317.

[0135] Therefore, through the second limiting sub-groove 317, a certain gap can be formed between the connecting part 95 and the side wall opposite to the second limiting sub-groove 317, which makes it easier to grasp the connecting part 95 through the gap and disassemble the bearing seat 9. It can also reduce the material input of the first guide member 3 and make it lighter.

[0136] In one example of the present invention, the connecting portion 95 includes a first connecting segment 951 and a second connecting segment 952 arranged along the axial direction of the fan assembly 100. In the circumferential direction of the fan assembly 100, the width of the first connecting segment 951 is greater than the width of the second connecting segment 952. A first limiting groove 316 is adapted to accommodate the first connecting segment 951, and a second limiting groove 317 is adapted to accommodate the second connecting segment 952. This improves the connection strength between the outer ring portion 94 and the main body portion 91, thus enhancing the structural strength of the bearing housing 9. Furthermore, it increases the contact area between the connecting portion 95 and the outer ring portion 94 and the main body, further restricting the rotation of the bearing housing 9 relative to the first guide member 3.

[0137] According to some embodiments of the present invention, a support column 96 is provided on the side of the bearing housing 9 away from the impeller 20 on the upstream side. The support column 96 extends along the axial direction of the fan assembly 100 toward the impeller 20 away from the upstream side, and the limiting groove 312 has a support column through hole 311 for receiving the support column 96. Thus, by inserting the support column 96 into the support column through hole 311, the bearing housing 9 can be restricted from rotating relative to the first guide member 3 by limiting the support column 96 by the first guide member 3, thereby avoiding wear caused by relative movement between the bearing housing 9 and the first guide member 3.

[0138] Optionally, the support column 96 is located on the side of the outer ring 94 away from the upstream impeller 20 and extends in a direction away from the upstream impeller 20. The support column through hole 311 is formed on the bottom wall of the second limiting groove 314 and extends along the axial direction of the fan assembly 100. Therefore, the support column 96 can be inserted into the support column through hole 311 along the axial direction of the fan assembly 100, which can significantly reduce the assembly difficulty of the bearing housing 9.

[0139] Optionally, multiple support columns 96 are provided, and the multiple support columns 96 are arranged at intervals along the circumference of the main body 91. Therefore, multiple support column holes 311 are formed on the first guide member 3 to cooperate with the support columns 96. The support columns 96 are all inserted into the support column holes 311. Thus, the guide ribs 303 limit the multiple support columns 96, further restricting the rotation of the bearing seat 9 relative to the first guide member 3, thereby avoiding wear caused by relative movement between the bearing seat 9 and the first guide member 3.

[0140] In a specific example, the support perforation 311 penetrates the limiting outer protrusion 309, so that the support 96 passes through the limiting outer protrusion 309. That is, the support perforation 311 is located within the limiting outer protrusion 309. It can be understood that the limiting outer protrusion 309 protrudes from the outer peripheral wall of the main body 91 and extends along the axial direction of the fan assembly 100. As a result, the support perforation 311 can have a longer extension length, thereby allowing for a longer support 96, which further enhances the connection strength between the first guide member 3 and the bearing seat 9.

[0141] According to some embodiments of the present invention, the fan assembly 100 further includes a third guide member (not shown) and a diffuser 6. At least a portion of the diffuser 6 is disposed within the outlet 15, between the downstream impeller 20 and the outlet 15. The diffuser 6 defines an outlet air duct 63 between the diffuser 6 and the housing 1, and the outlet air duct 63 communicates with the outlet 15 of the housing 1. The third guide member is disposed between the downstream impeller 20 and the diffuser 6 to guide the airflow from the downstream impeller outlet 202 to the outlet air duct 63. Thus, by providing the third guide member, it is beneficial to reduce the wind resistance between the secondary impeller outlet 202b and the outlet air duct 63, reduce wind power loss, and thereby further improve the airflow efficiency of the fan assembly 100.

[0142] Furthermore, the third guide element is annular in structure and is fitted onto the outer side of the downstream impeller 20. That is, the third guide element can be fitted onto the outer side of the secondary impeller 20b, for example... Figure 1 As shown, the third guide element is formed as a third guide ring, which is sleeved on the outer periphery of the secondary impeller outlet 202b to guide the airflow from the secondary impeller outlet 202b to the guide airflow duct 301. In this way, the third guide element can guide the airflow from the secondary impeller outlet 202b at any position in the circumferential direction. At the same time, the structure is simple and easy to manufacture.

[0143] In some embodiments, an annular micro-gap is formed between the third guide member and the downstream impeller 20 in the radial direction. That is, in the radial direction of the impeller 20, the third guide member and the secondary impeller 20b are spaced apart and form an annular micro-gap. This avoids interference of the third guide member with the movement of the secondary impeller 20b and facilitates assembly.

[0144] According to some embodiments of the present invention, the diffuser 6 has a diffuser mounting surface, which is the surface of the impeller 20 near the downstream side of the diffuser 6. A third guide is mounted on the diffuser mounting surface, and the diameter of the diffuser mounting surface is larger than the diameter of the secondary impeller 20b, so that the portion of the diffuser mounting surface extending beyond the impeller 20 in the radial direction forms an installation space. The third guide can be installed in the installation space of the diffuser mounting surface. In this way, the installation of the third guide can be more stable, and it is also beneficial to improve the space utilization of the fan assembly 100. At the same time, it is also convenient for the third guide to guide the airflow at the outlet 202b of the secondary impeller.

[0145] Furthermore, the third guide component includes: a third guide component body and a third guide component mounting part. The third guide component mounting part is disposed on the third guide component body, and a diffuser mounting part is formed on the diffuser mounting surface. The third guide component mounting part and the diffuser mounting part are detachably connected. This facilitates the installation and removal of the third guide component and the diffuser 6. For example, the third guide component mounting part and the diffuser mounting part can be plugged in or snapped together. Of course, the specific connection method of the third guide component mounting part and the diffuser mounting part is not limited here. The specific connection method of the third guide component mounting part and the diffuser mounting part can be reasonably selected according to actual needs.

[0146] Furthermore, the diffuser mounting portion is constructed as a diffuser mounting groove, and the third guide portion is constructed as a third mounting protrusion. For example, the third guide portion can be formed by at least a radially protruding portion of the surface of the third guide body facing the diffuser 6. The third mounting protrusion can be inserted into the diffuser mounting groove, thereby making the connection between the third guide and the diffuser 6 more stable and facilitating disassembly. Of course, the present invention is not limited to this; the diffuser mounting portion can also be formed as a third mounting protrusion, and the third guide portion can be constructed as a third mounting groove.

[0147] According to some embodiments of the present invention, the third guide member includes: a third guide member body. The third guide member body has a third guide member body guiding surface and a third guide member body pressing surface, wherein the third guide member body pressing surface is engaged with and presses against the diffuser mounting surface, and the third guide member body guiding surface is used to guide the airflow from the secondary impeller outlet 202b to the airflow duct 63, for example... Figure 1 As shown, the pressing surface of the third guide body and the mounting surface of the diffuser are opposite each other along the axial direction of the secondary impeller 20b. At the same time, the pressing surface of the third guide body and the mounting part of the third guide body are arranged radially inward and outward, and the pressing surface of the third guide body is located on the radially inner side of the mounting part of the third guide body. The pressing surface of the third guide body and the mounting part of the third guide body form a stepped structure. The guide surface of the third guide body faces the outer shell 1 and is formed as an arc surface. In this way, the pressing surface of the third guide body helps to stabilize the cooperation between the third guide and the diffuser 6. The guide surface of the third guide body can reduce wind resistance and reduce air volume loss while realizing air guidance.

[0148] Furthermore, the impeller outlet 202 of the upstream impeller 20 has a lower edge, and the inner circumference of the guide surface of the third guide body extends to a position adjacent to the lower edge of the impeller outlet 202. The outer circumference of the guide surface of the third guide body extends to the junction of the mounting surface 318 of the diffuser 6 and the outer circumference of the diffuser 6. In other words, the inner circumference of the guide surface of the third guide body extends to a position adjacent to the edge of the disk 23 of the secondary impeller 20b, and the outer circumference of the guide surface of the third guide body extends to the junction with the outer circumference of the diffuser 6. In this way, the guide surface of the third guide body can better guide the airflow from the secondary impeller outlet 202b into the airflow duct 63, thereby reducing airflow loss.

[0149] Furthermore, refer to Figure 1 and Figure 14 The flow guide surface of the third flow guide body and the outer peripheral surface of the diffuser 6 are smoothly transitioned. For example, the flow guide surface of the third flow guide body can be tangent to the outer peripheral surface of the diffuser 6, thereby further reducing the wind resistance at the connection between the flow guide surface of the third flow guide body and the outer peripheral surface of the diffuser 6, reducing air volume loss, and improving air outlet efficiency.

[0150] Furthermore, the inner circumferential surface of the outer casing 1 forms a downstream guide surface corresponding to the impeller 20 on the downstream side. The downstream guide surface corresponds to the guide surface of the third guide element body and forms a downstream transition duct 5 between them. The downstream transition duct 5 connects the impeller outlet 202 and the inlet of the outlet duct 63. For example, a portion of the inner wall of the outer casing 1 adjacent to the secondary impeller outlet 202b forms a downstream guide surface. The downstream guide surface is formed as an arc surface. The downstream guide surface and the guide surface of the third guide element body define the downstream transition duct 5. One end of the downstream transition duct 5 connects to the secondary impeller outlet 202b, and the other end connects to the inlet of the outlet duct 63. Since both the downstream guide surface and the guide surface of the third guide element body are formed as arcs, the downstream transition duct 5 is also formed as an arc. In this way, the downstream transition duct 5 can reduce wind resistance and reduce air volume loss while achieving airflow guidance, which is beneficial to improving air outlet efficiency.

[0151] Furthermore, the cross-sectional area of ​​the downstream transition duct 5 decreases from the impeller outlet 202 towards the inlet of the outlet duct 63. In other words, the cross-sectional area of ​​the downstream transition duct 5 can gradually decrease in the direction from the secondary impeller outlet 202b to the outlet duct 63. This helps to increase the airflow velocity, create negative pressure inside the fan assembly 100, and thus improve the suction power of the vacuum cleaner.

[0152] According to some embodiments of the present invention, in the axial direction of the fan assembly 100, a plurality of impellers 20 are located on the same side of the drive member 7. This allows the airflow from the upstream impeller 20 to be directly guided by the first guide member 3 to the downstream impeller 20, which can effectively reduce gas flow losses and improve the aerodynamic performance of the fan assembly 100.

[0153] Further, refer to Figure 14 The drive member 7 is adapted to define an air outlet 15 between itself and the inner wall of the receiving cavity 13, that is, at least a portion of the drive member 7 is located within the receiving cavity 13. For example, the drive member 7 may be completely located within the receiving cavity 13 to better protect the drive member 7 through the housing 1; or as... Figure 14 As shown, a portion of the drive member 7 is located within the receiving cavity 13. The outer peripheral wall of the drive member 7 and the cavity wall of the receiving cavity 13 define an air outlet 15 surrounding the drive member 7. This ensures better uniform airflow at the air outlet 15 and makes the fan assembly 100 compact, which is beneficial for reducing the radial dimension of the fan assembly 100.

[0154] According to other embodiments of the present invention, at least two impellers 20 are distributed on both sides of the drive member 7 in the axial direction of the fan assembly 100. That is, the first-stage impeller 20a and the second-stage impeller 20b are respectively located on both sides of the drive member 7 in the axial direction. Specifically, as shown... Figure 14 As shown, the impeller 20 on the upstream side and the impeller 20 on the downstream side are located on opposite sides of the drive member 7, so that the air outlet 15 of the impeller 20 on the upstream side flows through the drive member 7 and is discharged to the impeller 20 on the downstream side. This can effectively reduce the distance between the drive member 7 and the impeller 20, thereby reducing the loss of rotational transmission of the drive member 7 and helping to reduce the power consumption of the fan assembly 100.

[0155] For example, in the axial direction of the wind turbine assembly 100, the distance between the drive component 7 and the upstream impeller 20 is controlled to be consistent with the distance between the drive component 7 and the downstream side, which helps to improve the stability of the drive component 7 driving the impeller 20 to rotate.

[0156] The first guide member 3 can adjust the radial airflow of the impeller 20 on the upstream side toward the axial direction of the fan assembly 100. The drive member 7 is spaced apart from the inner surface of the housing 1 in the axial direction, so that the airflow can flow toward the impeller 20 on the downstream side through the gap between the drive member 7 and the housing 1.

[0157] Optionally, refer to Figure 14The fan assembly 100 also includes a converging portion 17. The downstream impeller 20 is located downstream of the converging portion 17. In the direction of the drive member 7 toward the downstream impeller 20, the inner diameter of the converging portion 17 decreases. The minimum inner diameter e of the converging portion 17 satisfies the condition e = d of the inner diameter d of the downstream impeller inlet 201. That is, the inner diameter of the end of the converging portion 17 adjacent to the downstream impeller 20 is the same as the inner diameter of the downstream impeller inlet 201. Thus, the converging portion 17 can effectively gather the airflow downstream of the drive member 7, allowing the airflow through the converging portion 17 to flow stably into the downstream impeller inlet 201. This improves the alignment between the converging portion 17 and the downstream impeller inlet 201, enhancing the stability of the gas flow.

[0158] Example 1

[0159] The fan assembly 100 includes: a housing 1, an impeller assembly 2, a first guide member 3, a bearing housing 9, a first bearing 10, a drive member 7, and a seal member 8. The impeller assembly 2 includes a primary impeller 20a and a secondary impeller 20b coaxially arranged with the output shaft 71 of the first guide member 3 and the drive member 7. The primary impeller 20a and the secondary impeller 20b are located on the same side in the axial direction of the drive member 7. The first guide member 3 is located between the primary impeller 20a and the secondary impeller 20b. The output shaft 71 of the drive member 7 is drively connected to the primary impeller 20a and the secondary impeller 20b and is rotatably connected to the first guide member 3.

[0160] The outer casing 1 includes a casing body 11 and a cover 12. The casing body 11 and the cover 12 together define a receiving cavity 13. The cover 12 is detachably connected to the casing body 11. An air inlet 14 communicating with the receiving cavity 13 is formed on the side of the cover 12 away from the casing body 11. The cover 12 covers the first-stage impeller 20a. An air outlet 15 is defined between the drive member 7 and the inner surface of the casing body 11.

[0161] The first-stage impeller 20a and the second-stage impeller 20b include: a wheel cover 22, a wheel disk 23, and blades 21. Specifically, an impeller inlet 201 is formed on the wheel cover 22, which can open along the axial direction of the impeller 20. The wheel disk 23 and the wheel cover 22 are arranged opposite to each other and spaced apart along the axial direction of the impeller 20. An impeller duct 203 is defined between the wheel disk 23 and the wheel cover 22. The inner end of the impeller duct 203 along the radial direction can communicate with the impeller inlet 201, and the outer end of the impeller duct 203 along the radial direction forms an impeller outlet 202. Multiple blades 21 are arranged circumferentially in the duct along the impeller inlet 201. Each blade 21 can form an arc shape that is radially curved relative to the impeller 20. Any two adjacent blades 21 in the circumferential direction, together with the wheel cover 22 and the wheel disk 23, define a sub-impeller outlet 205.

[0162] The cover 12 includes a cover body 121, a first bend 122 and a second bend 123. The outer periphery of the air outlet 15 is bent toward the inside of the air outlet 15 to form the first bend 122. The end of the first bend 122 away from the cover body 121 is bent toward the direction close to the first stage impeller 20a to form the second bend 123. An annular groove 18 is defined between the first bend 122, the second bend 123 and the cover body 121. The outer periphery of the impeller outlet 202 of the first stage impeller 20a is located in the annular groove 18.

[0163] A limiting groove 312 is formed on the end face of the first guide member 3 facing the first-stage impeller 20a, and the bearing housing 9 is installed in the limiting groove 312. The bearing housing 9 includes a main body 91, an outer ring 94, a connecting part 95, and a support 96. The main body 91 forms a bearing mounting groove 92 extending along the axial direction of the outer casing 1. The bottom wall of the bearing mounting groove 92 forms a through hole penetrating the main body 91, and the first bearing 10 is installed in the bearing mounting groove 92. The outer ring 94 is located on the outer periphery of the main body 91, and the connecting part 95 passes between the outer ring 94 and the side wall opposite to the main body 91. Multiple connecting parts 95 are provided, and the multiple connecting parts 95 are arranged at intervals along the outer periphery of the main body 91. The support 96 is provided on the lower end face of the outer ring 94 and extends in a direction away from the first-stage impeller 20a.

[0164] Furthermore, the connecting portion 95 includes a first connecting segment 951 and a second connecting segment 952 stacked together. The first connecting segment 951 is located above the second connecting segment 952, and in the circumferential direction of the main body 91, the width of the first connecting segment 951 is greater than the width of the second connecting segment 952. The limiting groove 312 includes a first limiting groove 313, a second limiting groove 314, a third limiting groove 315, and a support perforation 311. Specifically, the first limiting groove 313 extends along the axial direction of the outer shell 1, and the bottom wall of the first limiting groove 313 forms a first guide hole 310. The main body 91 is located in the first limiting groove 313. The second limiting groove 314 is formed into an annular shape and is located on the outer periphery of the second limiting groove 314. The outer ring 94 is located in the second limiting groove 314. The two ends of the third limiting groove 315 are respectively connected to the first limiting groove 313 and the second limiting groove 314. The connecting part 95 is located in the third limiting groove 315. The third limiting groove 315 includes a first limiting sub-groove 316 and a second limiting sub-groove 317. The second limiting sub-groove 317 is formed by extending the bottom wall of the first limiting sub-groove 316 in a direction away from the first-stage impeller 20a. In the circumferential direction of the first limiting groove 313, the width of the first limiting sub-groove 316 is greater than the width of the second limiting sub-groove 317. The second connecting segment 952 is located within the second limiting sub-groove 317, and the first connecting segment 951 is located within the first limiting sub-groove 316. Furthermore, a support perforation 311 is provided on the bottom wall of the second limiting groove 314 and extends in a direction away from the first-stage impeller 20a. The support 96 passes through the support perforation 311.

[0165] The first guide element 3 includes a first guide element body 302, a guide rib 303, and a limiting external protrusion 309. The end of the guide rib 303 away from the first guide element body 302 abuts against the inner wall of the receiving cavity 13. In the direction away from the first stage impeller 20a, the cross-sectional area of ​​the first guide element body 302 decreases. Multiple guide ribs 303 are provided, and the multiple guide ribs 303 are arranged circumferentially at intervals on the outer peripheral wall of the first guide element body 302. In the direction towards the second stage impeller 20b, the angle between the deflection angle of the guide rib 303 and the axial direction of the fan assembly 100 gradually decreases.

[0166] The guide rib 303 includes a first extension section 306, a second extension section 307, and a connecting section 308. The connecting section 308 is located between the first extension section 306 and the second extension section 307, and its two ends are respectively connected to one end of the first extension section 306 and the second extension section 307. The other end of the first extension section 306 extends toward the first-stage impeller 20a, and the other end of the second extension section 307 extends toward the second-stage impeller 20b. In the direction away from the connecting section 308, the thickness of the first extension section 306 and the second extension section 307 gradually decreases, that is, the thickness of the upper and lower ends of the guide rib 303 is less than the thickness of the middle position.

[0167] The limiting protrusion 309 extends along the axial direction of the fan assembly 100, and at least a portion of the limiting protrusion 309 is provided on the guide rib 303. A portion of the support through hole 311 is provided inside the limiting protrusion 309. A limiting groove 16 that cooperates with the limiting protrusion 309 is formed on the inner wall of the shell body 11, and the limiting protrusion 309 passes through the limiting groove 16.

[0168] The secondary impeller 20b is located on the side of the first guide member 3 away from the primary impeller 20a, and the inner wall of the receiving cavity 13 smoothly transitions with the inner peripheral wall of the impeller inlet 201 of the secondary impeller 20b. The sealing member 8 includes a first sealing member 81 and a second sealing member 82. The first sealing member 81 is filled within the annular groove 18, and the second sealing member 82 is filled between the outer peripheral edge of the impeller inlet 201 of the secondary impeller 20b and the inner wall of the receiving cavity 13.

[0169] The drive unit 7 is located on the side of the secondary impeller 20b away from the first guide member 3. The output shaft 71 of the drive unit 7 passes through the secondary impeller 20b, the first guide member 3, the bearing seat 9 and the first bearing 10 in sequence and cooperates with the primary impeller 20a. The output shaft 71 of the drive unit 7 is fixedly connected to the primary impeller 20a and the second impeller 20. The output shaft 71 of the drive unit 7 can rotate within the through hole 310 of the first guide member and the through hole 93 of the bearing seat.

[0170] Example 2

[0171] This embodiment has a largely the same structure as Embodiment 1, with identical components using the same reference numerals. Figure 3 Figure 14 The difference between Embodiment 2 and Embodiment 1 is that, in the axial direction of the fan assembly 100, the first-stage impeller 20a and the second-stage impeller 20b are located on both sides of the drive chamber, the end of the shell body 11 away from the cover 12 forms an air outlet 15, the second-stage impeller 20b is disposed in the air outlet 15, and the end of the shell body 11 away from the cover 12 is connected to a plurality of diffusers 6 arranged in series, so that the airflow discharged through the second-stage impeller 20b can be discharged from the fan assembly 100 after passing through a plurality of diffusers 6.

[0172] A vacuum cleaner according to a second aspect of the present invention is described below.

[0173] The vacuum cleaner according to an embodiment of the present invention includes the aforementioned fan assembly 100. Because the fan assembly 100 has a small axial dimension and a high internal vacuum, it can effectively reduce the installation space occupied by the vacuum cleaner, thus facilitating a smaller size and lightweight design. Furthermore, its high suction power improves the vacuum cleaner's cleaning efficiency.

[0174] According to the present invention, by providing the blower assembly 100 for vacuum cleaner described above, the vacuum cleaner can improve the airflow and thus the suction power, while also facilitating miniaturization and portability.

[0175] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0176] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0177] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A fan assembly, characterized in that, include: shell; An impeller assembly, at least a portion of which is housed within the housing, the impeller assembly comprising a plurality of impellers arranged in series in the airflow direction of the fan assembly; A first guide member, adapted to guide the airflow from the upstream impeller to the downstream impeller; A driving component, the driving component being used to drive the impeller to rotate; A bearing housing is detachably mounted on the first guide member. A limiting groove for accommodating the bearing housing is formed on the axial end face of the impeller facing upstream of the first guide member. A through hole of the first guide member is formed on the bottom wall of the limiting groove. The output shaft of the drive member passes through the through hole of the first guide member. A first bearing, wherein the bearing housing has a bearing mounting groove for accommodating the first bearing, the output shaft of the drive member passes through the first bearing, and the bearing housing includes: The main body has a bearing mounting groove formed thereon, and the bottom wall of the bearing mounting groove has a bearing seat through hole that is directly opposite to the through hole of the first guide member. An outer ring portion is disposed around the outer periphery of the main body portion, and the outer ring portion is coaxially disposed with the main body portion; A connecting portion, the two ends of which are respectively connected to the side walls opposite to the main body and the outer ring portion, and multiple connecting portions are provided, which are arranged at intervals along the outer peripheral wall of the main body; The main body, the outer ring, and the connecting part are all embedded in the limiting groove; The limiting groove includes: The first limiting groove extends along the axial direction of the fan assembly, the main body is accommodated in the first limiting groove, and the bottom wall of the first limiting groove forms the first guide through hole. The second limiting groove extends along the circumferential direction of the fan assembly and is formed in an annular shape, with the outer ring portion accommodated within the second limiting groove; The third limiting groove extends radially along the fan assembly, and its two ends are respectively connected to the first limiting groove and the second limiting groove. The connecting part is located inside the third limiting groove.

2. The fan assembly of claim 1, wherein, In the airflow direction of the fan assembly, the distance between the bearing housing and the impeller on the upstream side is not less than the distance between the first guide member and the impeller on the upstream side.

3. The fan assembly of claim 1, wherein, The third limiting groove includes a first limiting sub-groove and a second limiting sub-groove arranged along the axial direction of the fan assembly. At least a portion of the connecting part is located in the second limiting sub-groove. In the circumferential direction of the fan assembly, the width of the first limiting sub-groove is greater than the width of the second limiting sub-groove.

4. The fan assembly of claim 3, wherein, The connecting portion includes a first connecting segment and a second connecting segment arranged along the axial direction of the fan assembly. In the circumferential direction of the fan assembly, the width of the first connecting segment is greater than the width of the second connecting segment. The first limiting sub-groove is adapted to accommodate the first connecting segment, and the second limiting sub-groove is adapted to accommodate the second connecting segment.

5. The fan assembly of claim 1, wherein, A support column is provided on the side of the bearing housing away from the impeller on the upstream side. The support column extends along the axial direction of the fan assembly toward the impeller away from the upstream side. The limiting groove forms a support column through hole to accommodate the support column.

6. The fan assembly of claim 5, wherein, The support column is located on the side of the outer ring portion away from the upstream side of the impeller, and the support column perforation is formed on the bottom wall of the second limiting groove, and the support column perforation extends along the axial direction of the fan assembly.

7. The fan assembly of claim 5, wherein, The support column is provided in multiple parts, and the multiple support columns are arranged at intervals along the circumference of the main body.

8. The fan assembly of claim 5, wherein, The first flow guide includes: The first guide body has a limiting groove on the axial end face of the impeller facing the upstream side of the first guide body. The guide ribs are provided in multiple ways, and the multiple guide ribs are arranged at intervals along the outer peripheral wall of the first guide body; A limiting protrusion is provided on the outer peripheral wall of the first guide body and extends along the axial direction of the first guide body. The support hole passes through the limiting protrusion and the first guide body along the axial direction.

9. A vacuum cleaner characterised by include: The wind turbine assembly according to any one of claims 1-8.

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