Fan assembly and vacuum cleaner having the same

Abstract

The application discloses a fan assembly and a dust collector with the same. The fan assembly comprises a housing, an impeller assembly, a first flow guide and a driving member. At least part of the impeller assembly is accommodated in the housing. The impeller assembly comprises a plurality of impellers arranged along an axial direction of the fan assembly. The first flow guide is adapted to guide the air outlet of the upstream impeller to the downstream impeller. The first flow guide and the inner surface of the housing define a flow guide air duct. The flow guide air duct is arc-shaped and is offset towards the axial direction of the fan assembly in the direction from the upstream impeller to the downstream impeller. The driving member is used to drive the rotation of the impeller. According to the fan assembly, the air field disorder caused by the inconsistency between the air flow direction and the impeller inlet direction can be avoided, so that the air flow loss can be reduced, and the air dynamic performance of the fan assembly can be improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of dust collectors, in particular to a fan assembly and a dust collector with the same. BACKGROUND

[0002] With the improvement of people's living standards, dust collectors gradually enter thousands of households and become important cleaning appliances in daily life. The suction force of the dust collector directly affects the cleaning effect. In related technologies, the aerodynamic layout of the fan assembly of the dust collector still has certain limitations, which leads to limited suction force of the dust collector, and the size of the fan assembly is relatively large, which occupies a large space. SUMMARY

[0003] The application provides a fan assembly, which has the advantages of low airflow loss and good aerodynamic performance.

[0004] The application further provides a dust collector with the fan assembly.

[0005] According to the fan assembly, the deflection angle of the flow guide air duct can be controlled according to the air inlet angle of the downstream impeller, so that the airflow passing through the first flow guide piece can flow to the downstream impeller more smoothly, air field disorder caused by the inconsistency between the airflow direction and the impeller inlet direction can be avoided, the gas flow loss can be reduced, and the aerodynamic performance of the fan assembly can be improved.

[0006] According to the fan assembly, the deflection angle of the flow guide air duct can be controlled according to the air inlet angle of the downstream impeller, so that the airflow passing through the first flow guide piece can flow to the downstream impeller more smoothly, air field disorder caused by the inconsistency between the airflow direction and the impeller inlet direction can be avoided, the gas flow loss can be reduced, and the aerodynamic performance of the fan assembly can be improved.

[0007] According to some embodiments of the application, the cross-sectional area of the first flow guide piece is reduced in the direction from the upstream impeller to the downstream impeller.

[0008] According to some embodiments of the application, the impeller has an impeller inlet extending in the axial direction of the fan assembly and an impeller outlet located on the outer peripheral wall of the impeller, and the first flow guide piece is adapted to guide the air outlet of the upstream impeller outlet to flow to the downstream impeller inlet at least in the axial direction of the fan assembly.

[0009] According to some embodiments of the present application, the first flow guide member comprises a first flow guide member body and a plurality of flow guide ribs arranged at intervals along a peripheral wall of the first flow guide member body, one end of the flow guide ribs away from the first flow guide member body abutting against an inner wall surface of the shell to define the flow guide air duct between two adjacent flow guide ribs, the first flow guide member body and a cavity wall of the accommodating cavity of the shell.

[0010] According to some embodiments of the present application, the flow guide ribs extend in an arc shape, and the deflection angle of the flow guide ribs relative to the axial direction of the fan assembly decreases in a direction from the upstream side impeller towards the downstream side impeller.

[0011] According to some embodiments of the present application, one end of the flow guide ribs away from the upstream side impeller extends in the axial direction of the fan assembly.

[0012] According to some embodiments of the present application, the flow guide ribs comprise a first flow guide rib and a second flow guide rib, the first flow guide rib has a greater extension length than the second flow guide rib, and the first flow guide rib and the second flow guide rib are arranged alternately and at intervals along the peripheral wall of the first flow guide member body.

[0013] According to some embodiments of the present application, the first flow guide rib and the second flow guide rib extend in the same direction.

[0014] According to some embodiments of the present application, one end of the first flow guide rib adjacent to the upstream side impeller is in the same plane as one end of the second flow guide rib adjacent to the upstream side impeller.

[0015] According to some embodiments of the present application, the length f of the second flow guide rib and the length g of the first flow guide rib satisfy 0.3≤f / g≤0.7.

[0016] According to some embodiments of the present application, the flow guide rib has a first extension section adjacent to the upstream side impeller, a second extension section adjacent to the downstream side impeller and a connecting section connecting the first extension section and the second extension section, and the thickness of the first extension section and the second extension section decreases in a direction away from the connecting section.

[0017] According to some embodiments of the present application, the first flow guide member body is provided with a limiting outer protrusion, a cavity wall of the accommodating cavity of the shell forms a limiting rotation groove matched with the limiting outer protrusion, and the limiting outer protrusion is located in the limiting rotation groove.

[0018] According to some embodiments of the present application, a plurality of limiting outer protrusions are arranged at intervals along the peripheral wall of the first flow guide member body, and at least part of the limiting outer protrusions are arranged on the flow guide ribs.

[0019] The dust collector according to an embodiment of the present application comprises the fan assembly.

[0020] The dust collector according to an embodiment of the present application can control the deflection angle of the guide air duct according to the air inlet angle of the impeller on the downstream side, so that the air flow passing through the first guide member can flow more smoothly to the impeller on the downstream side, and air field disorder caused by the inconsistency between the air flow direction and the impeller inlet direction can be avoided, thereby reducing the air flow loss and improving the aerodynamic performance of the fan assembly.

[0021] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is an exploded view of the fan assembly according to an embodiment of the present application;

[0023] Figure 2 is a schematic view of one embodiment of the fan assembly according to an embodiment of the present application;

[0024] Figure 3 is a cross-sectional view of the fan assembly shown in Figure 2

[0025] Figure 4 is an enlarged view of the portion A shown in Figure 3

[0026] Figure 5 is an exploded view of the impeller of the fan assembly according to an embodiment of the present application;

[0027] Figure 6 is a top view of the wheel disc of the impeller according to an embodiment of the present application;

[0028] Figure 7 is a schematic view of one angle of the first guide member of the fan assembly according to an embodiment of the present application;

[0029] Figure 8 is a schematic view of another angle of the first guide member shown in Figure 7

[0030] Figure 9 is a schematic view of yet another angle of the first guide member shown in Figure 7

[0031] Figure 10 is a schematic view of still another angle of the first guide member shown in Figure 7

[0032] Figure 11 is a partial schematic view of the housing of the fan assembly according to an embodiment of the present application;​​​​​

[0033] Figure 12 This is a schematic diagram of the cooperation between the first and second flow guides;

[0034] Figure 13 This is a schematic diagram of another embodiment of a wind turbine assembly according to an embodiment of the present invention;

[0035] Figure 14 yes Figure 13 A cross-sectional view of the wind turbine assembly shown;

[0036] Figure 15 yes Figure 13 An exploded view of the wind turbine assembly shown.

[0037] 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;

[0038] Figure 17 yes Figure 16 A schematic diagram of another angle of the bearing housing shown.

[0039] Figure label:

[0040] Fan assembly 100;

[0041] 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;

[0042] 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;

[0043] 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;

[0044] 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

[0045] Downstream transition duct 5,

[0046] 6 diffuser; 61 exhaust duct;

[0047] Drive component 7; Output shaft 71;

[0048] Seal 8; First seal 81; Second seal 82;

[0049] 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;

[0050] First bearing 10. Detailed Implementation

[0051] Embodiments of the present invention are described in detail below, examples of which 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.

[0052] 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.

[0053] The following is a reference appendix. Figures 1-17 A 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.

[0054] 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.

[0055] Specifically, at least part of the impeller assembly 2 is accommodated in the housing 1. That is, the impeller assembly 2 can be completely accommodated inside the housing 1, so that the impeller assembly 2 can be better protected by the housing 1, thereby improving the anti-interference ability and stability of the impeller assembly 2. Among them, the impeller assembly 2 includes a plurality of impellers 20 arranged in series in the airflow direction of the fan assembly 100. That is, when the airflow passes through the fan assembly 100, it will flow through the plurality of impellers 20 in turn. It can be understood that the airflow passing through the impeller 20 can better obtain the effect of pressure increase. Thus, the airflow will complete multiple pressure increases when passing through the plurality of impellers 20, so that the plurality of impellers 20 can better improve the vacuum degree inside the housing 1 at the same rotational speed, that is, increase the pressure difference between the outside and the inside of the fan assembly 100, so that the air outside the fan assembly 100 enters the inside of the housing 1 more quickly, thereby improving the suction of the fan assembly 100, and further improving the dust collection efficiency of the dust collector.

[0056] As shown in Figure 3 , the first flow guide 3 is adapted to guide the air outlet of the upstream impeller 20 to the downstream impeller 20. Here, the upstream and downstream refer to the position of the first flow guide 3 in the airflow direction of the fan assembly 100. That is, the first flow guide 3 is located downstream of the airflow of the upstream impeller 20, and the downstream impeller 20 is located downstream of the airflow of the first flow guide 3. Thus, the air outlet of the upstream impeller 20 can be better adjusted by the first flow guide 3, such as adjusting the air outlet angle of the upstream impeller 20, so that the air outlet of the upstream impeller 20 can flow to the downstream impeller 20 in a certain direction after adjustment by the first flow guide 3, thereby better reducing airflow loss and improving the aerodynamic performance of the fan assembly 100.

[0057] Further, the diameter of the first flow guide 3 decreases in the direction from the upstream impeller 20 to the downstream impeller 20. That is, the diameter of one end of the first flow guide 3 adjacent to the upstream impeller 20 is greater than the diameter of one end of the first flow guide 3 adjacent to the downstream impeller 20. Thus, the radial dimension of the first flow guide 3 can be reduced, thereby reducing the radial dimension of the fan assembly 100, so that the fan assembly 100 occupies a smaller radial dimension in the dust collector, and the weight of the first flow guide 3 is lighter, which is conducive to the lightweight design of the fan assembly 100.

[0058] As shown in Figure 3 , the driving member 7 can be used to drive the rotation of the impeller 20. That is, the driving member 7 is in transmission connection with the plurality of impellers 20. Thus, the rotational speed of the impeller 20 can be controlled by controlling the power of the driving member 7, so as to accurately adjust the suction of the fan assembly 100.

[0059] According to some embodiments of the present application, as shown in Figure 3 and Figure 14 A plurality of impellers 20 are arranged coaxially along the axial direction of the fan assembly 100. That is, the axes of the plurality of impellers 20 are located on the same straight line, thereby better reducing the space occupied by the impeller assembly 2 in the radial direction, facilitating the reduction of the radial size of the fan assembly 100, and facilitating the lightweight design of the dust collector. In addition, the output shaft 71 of the driving member 7 can be coaxially arranged with the plurality of impellers 20, so that the output shaft 71 of the driving member 7 can be simultaneously connected with the plurality of impellers 20, thereby reducing the number of driving members 7, saving the space occupied by the driving members 7, and further reducing the size of the fan assembly 100, facilitating the lightweight design of the dust collector and low cost.

[0060] Further, when the plurality of impellers 20 are fixedly connected with the output shaft 71 of the same driving member 7, under the condition that the driving member 7 rotates the same, the plurality of impellers 20 can form high vacuum degree in the fan assembly 100 through the pressurization processing of the airflow, thereby improving the suction of the fan assembly 100, and further improving the dust collection efficiency of the dust collector. Therefore, compared with the fan in the related art, under the same working condition of suction, the power of the driving member 7 is lower, that is, the rotation speed of the output shaft 71 is slower. Thus, the noise caused by the rotation of the output shaft 71 can be better controlled, and the power consumption of the fan assembly 100 is reduced, thereby improving the use experience of the dust collector.

[0061] In some embodiments of the present application, the impeller 20 has an impeller inlet 201 extending along the axial direction of the fan assembly 100 and an impeller outlet 202 located at the outer periphery of the impeller 20. That is, under the driving of the driving member 7, the airflow can enter the inside 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, that is, the axial air inlet can be better adjusted to radial air outlet through the impeller 20.

[0062] According to some embodiments of the present application, as shown in Figure 5 and Figure 6The impeller 20 comprises a cover 22, a disc 23 and a plurality of blades 21. Specifically, the cover 22 is formed with an impeller inlet 201 which can be open in the axial direction of the impeller 20, the disc 23 is arranged opposite to the cover 22 along the axial direction of the impeller 20 and spaced apart from the cover 22, the disc 23 and the cover 22 define an impeller air duct 203 therebetween, the inner end of the impeller air duct 203 along the radial direction can be communicated with the impeller inlet 201, and the outer end of the impeller air duct 203 along the radial direction is formed with an impeller outlet 202, at this time, the impeller air duct 203 is formed in a ring shape, and the airflow flows through the impeller air duct 203 and is generally radially outwards, of course, the specific outflow direction is related to the shape of the blades 21; the plurality of blades 21 are arranged in the air duct and spaced apart in the circumferential direction of the impeller inlet 201, each blade 21 can form an arc shape which is radially curved relative to the impeller 20, and any two adjacent blades 21 in the circumferential direction and the cover 22 and the disc 23 define a sub-impeller outlet 205, that is, the plurality of sub-impeller outlets 205 collectively constitute the impeller outlet 202, so that the impeller 20 can uniformly outflow in all directions.

[0063] Further, the first flow guide 3 is adapted to guide the outflow of the upstream-side impeller outlet 202 to flow at least in the axial direction of the fan assembly 100 to the downstream-side impeller inlet 201. That is, the first flow guide 3 is adapted to adjust the radial outflow of the upstream-side impeller 20 to be at least partially axial airflow. Among them, the first flow guide 3 can guide the outflow of the upstream-side impeller outlet 202 to be adjusted to be entirely axial airflow; or the outflow of the upstream-side impeller outlet 202 is adjusted to be partially axial airflow after passing through the first flow guide 3. It can be understood that the downstream-side impeller inlet 201 extends in the axial direction of the fan assembly 100, so that the airflow adjusted to flow in the axial direction of the fan assembly 100 by the first flow guide 3 can more smoothly enter the downstream-side impeller inlet 201, and can better avoid the airflow field disorder caused by the airflow direction being inconsistent with the direction of the impeller inlet 201, thereby better reducing the gas flow loss and improving the aerodynamic performance of the fan assembly 100.

[0064] According to some embodiments of the present application, with reference to Figure 3The first flow guide 3 and the inner wall surface of the shell 1 define a flow guide air duct 301, which is arc-shaped and is offset towards the axial direction of the fan assembly 100 in the direction from the upstream impeller 20 towards the downstream impeller 20. That is, when the gas flows in the flow guide air duct 301 towards the downstream impeller 20, the included angle between the flow direction of the gas and the axial direction of the fan assembly 100 gradually decreases, that is, the angle deflection of the airflow can be better realized through the arc-shaped flow guide air duct 301, so that the airflow passing through the first flow guide 3 can flow to the downstream impeller 20 in a certain direction. Thus, the deflection angle of the flow guide air duct 301 can be controlled according to the inlet angle of the downstream impeller 20, so that the airflow passing through the first flow guide 3 can flow more smoothly to the downstream impeller 20, and the airflow direction inconsistency with the impeller inlet 201 direction can be better avoided, thereby reducing the gas flow loss and improving the aerodynamic performance of the fan assembly 100.

[0065] The two ends of the flow guide air duct 301 are formed with a flow guide inlet and a flow guide outlet, the opening direction of the flow guide inlet is parallel to the opening direction of the impeller outlet 202 of the upstream impeller 20, and the opening direction of the flow guide outlet is parallel to the opening direction of the impeller inlet 201 of the downstream impeller 20. The flow guide air duct 301 is arc-shaped, that is, the flow guide inlet can be opened substantially along the radial direction of the primary impeller 20a, and the flow guide outlet can be opened substantially along the axial direction of the secondary impeller 20b. The flow guide air duct 301 can change the radial outlet of the primary impeller outlet 202a to axial outlet to be delivered to the secondary impeller 20b, so that the airflow inside the fan assembly 100 is more efficient and smooth.

[0066] According to some embodiments of the application, the maximum diameter a of the first flow guide 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 flow guide 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 flow guide 3 to the diameter b of the upstream impeller 20 can be 1.05, 1.1, 1.15, 1.2, etc., which is not limited here. That is, the diameter of one end of the first flow guide 3 adjacent to the upstream impeller 20 is greater than the diameter of the upstream impeller 20, that is, the outer peripheral wall of the first flow guide 3 protrudes out of the outer peripheral wall of the upstream impeller 20. Thus, the part of the first flow guide 3 protruding out of the outer peripheral wall of the upstream impeller 20 can better receive the outlet air of the upstream impeller 20, thereby ensuring the adjustment effect of the first flow guide 3 on the airflow direction.

[0067] According to some embodiments of the present application, the minimum diameter c of the first flow guide 3 and the inner diameter d of the impeller inlet 201 of the downstream impeller 20 satisfy: c=d. That is, the diameter of the end of the first flow guide 3 adjacent to the downstream impeller 20 is the same as the diameter of the impeller inlet 201 of the downstream impeller 20. In this way, the end of the first flow guide 3 adjacent to the downstream impeller 20 can be aligned with the downstream impeller inlet 201, which is conducive to reducing gas flow loss.

[0068] According to some embodiments of the present application, referring to Figure 7 and Figure 8 , the first flow guide 3 comprises a first flow guide body 302 and a plurality of flow guide ribs 303 arranged at intervals along the outer peripheral wall of the first flow guide body 302, and the end of the flow guide rib 303 away from the first flow guide body 302 abuts against the inner surface of the housing 1 to define a flow guide air duct 301 in front of the adjacent two flow guide ribs 303, the first flow guide body 302 and the inner surface of the housing 1. In this way, by cooperating the first flow guide 3 with the housing 1, a plurality of flow guide air ducts 301 can be formed on the outer peripheral side of the first flow guide 3, so that the air outlet of the upstream impeller 20 can flow through the plurality of flow guide air ducts 301 towards the downstream impeller 20, while ensuring the adjustment effect of the flow direction of the gas, and the air outlet of the upstream impeller 20 at multiple positions in the radial direction can flow through the flow guide air duct 301, and then flow to the downstream impeller 20 in a certain direction under the guidance of the flow guide air duct 301, thereby ensuring the guiding efficiency of the first flow guide 3. In addition, the first flow guide 3 has multiple air outlet positions in the circumferential direction, so that the air outlet of the first flow guide 3 is more uniform, which is conducive to ensuring the stability of the gas field.

[0069] Further, referring to Figure 8 , the flow guide rib 303 extends in an arc shape, and the deflection angle of the flow guide rib 303 with respect to the axial direction of the fan assembly 100 decreases in the direction from the upstream impeller 20 to the downstream impeller 20. In this way, when the gas flows in the flow guide air duct 301 towards the downstream impeller 20, the included angle between the flow direction of the gas and the axial direction of the fan assembly 100 gradually decreases under the guidance of the flow guide rib 303. In one specific example, the end of the flow guide rib 303 away from the upstream impeller 20 extends in the axial direction of the fan assembly 100, so that at least part of the airflow through the flow guide air duct 301 can flow to the downstream impeller 20 in the axial direction of the fan assembly 100, which can better avoid the turbulence of the air outlet of the upstream impeller 20 causing the turbulence of the gas field, thereby reducing the gas flow loss and improving the aerodynamic performance of the fan assembly 100.

[0070] According to some embodiments of the present application, the guide ribs 303 can include first guide ribs (not shown in the figure) and second guide ribs (not shown in the figure), wherein the extension length of the first guide ribs is greater than the extension length of the second guide ribs, and the first guide ribs and the second guide ribs are alternately and spacedly arranged along the outer peripheral wall of the first guide member body 302. That is, in the circumferential direction of the first guide member body 302, a second guide rib is arranged between every two adjacent first guide ribs, and a first guide rib is arranged before every two adjacent second guide ribs, and the adjacent first guide rib and the adjacent second guide rib define the guide air duct 301. Thus, while ensuring the guiding effect on the airflow, the weight of the first guide member 3 can be reduced, the production material of the first guide member 3 can be saved, and the lightweight design of the fan assembly 100 can be realized with low cost.

[0071] Optionally, the extension directions of the first guide ribs and the second guide ribs are consistent. Thus, the airflow direction in the airflow passage between the first guide rib and the second guide rib is consistent, so that the airflow direction when the airflow is discharged from the guide air duct 301 is consistent, thereby avoiding the loss caused by airflow turbulence, and the performance of the fan assembly 100 is improved.

[0072] Optionally, one end of the first guide rib adjacent to the upstream side impeller 20 and one end of the second guide rib adjacent to the upstream side impeller 20 are in the same plane. That is, the air inlets 14 of the plurality of guide air ducts 301 are in the same plane, so that the airflow discharged from the upstream side impeller 20 can enter the plurality of guide air ducts 301 uniformly, thereby improving the stability of the gas flow.

[0073] In addition, the distance between one end of the first guide rib away from the upstream side impeller 20 and the upstream side impeller 20 is greater than the distance between one end of the second guide rib away from the upstream side impeller 20 and the upstream side impeller 20. It can be understood that the first guide member 3 is inverted conical, so that 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 guide rib and the second guide rib enters between the adjacent two first guide ribs on the side of the guide rib 303 away from the upstream side impeller 20, so that the inverted conical first guide member 3 can be well adapted, and the width of the air outlet 15 of the guide air duct 301 can be maintained, and the airflow loss caused by the narrowing of the guide air duct 301 can be well avoided.

[0074] Optionally, the length f of the second guide fin and the length g of the first guide fin satisfy 0.3≤f / g≤0.7. That is, the length ratio of the second guide fin to the first guide fin is controlled between 0.3 and 0.7, for example, the length ratio of the second guide fin to the first guide fin can be 0.3, 0.4, 0.5, 0.6, 0.7, etc., which is not limited here. When the length ratio of the second guide fin to the first guide fin is too small, the length of the second guide fin is too small, so that the guide air duct 301 between the first guide fin and the second guide fin is too short, which is not conducive to the air guiding effect; when the length ratio of the second guide fin to the first guide fin is too large, the length of the second guide fin is too large, so that the first guide fin and the second guide fin cannot adapt to the shape of the first guide member 3. Therefore, by controlling the length ratio of the second guide fin to the first guide fin between 0.3 and 0.7, the gas flow loss caused by the narrowing of the guide air duct 301 can be well avoided while ensuring the gas guiding effect.

[0075] Optionally, the guide fin 303 has a first extension section 306 adjacent to the upstream side impeller 20, a second extension section 307 adjacent to the downstream side impeller 20, and a connecting section 308 connecting the first extension section 306 and the second extension section 307, and the thickness of the first extension section 306 and the second extension section 307 decreases in the direction away from the connecting section 308. That is, in the extension direction of the guide fin 303, the thickness of the two end terminals is smaller than the thickness of the middle position of the first guide member 3. Therefore, when the air flow of the upstream side impeller 20 flows into the guide air duct 301, the thickness of the one end of the first extension section 306 away from the connecting section 308 is small, which can well reduce the gas flow resistance and is conducive to reducing the gas flow loss.

[0076] Further, the second extension section 307 has a small thickness in the direction away from the connecting section 308, so that the spacing between the adjacent two guide fins 303 increases in the direction away from the upstream side impeller 20, thereby the gradually narrowing of the guide air duct 301 caused by the inverted conical shape of the first guide member body 302 can be well solved, so that the gas flow loss can be well reduced.

[0077] Optionally, a limiting outer protrusion 309 is arranged on the outer peripheral wall of the first guide member body 302, and a limiting rotation groove 16 is formed on the inner surface of the shell 1 and cooperates with the limiting outer protrusion 309. That is, by cooperating the limiting outer protrusion 309 with the limiting rotation groove 16, that is, placing the limiting outer protrusion 309 in the limiting rotation groove 16, the first guide member 3 is fixed relative to the shell 1, preventing the first guide member 3 from rotating relative to the shell 1, so as to ensure the guiding effect of the first guide member 3.

[0078] Further, with reference to Figure 8The plurality of limiting outer protrusions 309 are arranged along the outer circumferential wall of the first flow guide body 302. In this way, the fixing effect of the shell 1 on the first flow guide 3 can be improved, and the flow guiding effect of the first flow guide 3 can be ensured. In one specific example, the limiting outer protrusions 309 extend along the axial direction of the fan assembly 100. In this way, the limiting outer protrusions 309 can be inserted into the rotation limiting groove 16 along the axial direction of the fan assembly 100, which facilitates the assembly of the first flow guide 3.

[0079] Optionally, at least part of the limiting outer protrusions 309 are arranged on the flow guide ribs 303. In this way, the flow guide ribs 303 and the limiting outer protrusions 309 share part of the structure, which can save material investment and facilitate the reduction of the weight of the first flow guide 3. In addition, the resistance of the limiting outer protrusions 309 to the airflow in the flow guide duct 301 can be reduced, thereby reducing airflow loss and improving the performance of the fan assembly 100.

[0080] The flow guide ribs 303 can be an integral structure, that is, the first flow guide body 302, the flow guide ribs 303, and the limiting outer protrusions 309 can be processed by integral molding. The integral structure can ensure the structural and performance stability of the first flow guide body 302, the flow guide ribs 303, and the limiting outer protrusions 309, and is convenient to form and manufacture. In addition, the integral structure eliminates the need for additional assembly parts and connection processes, greatly improves the assembly efficiency of the first flow guide body 302, the flow guide ribs 303, and the limiting outer protrusions 309, and ensures the connection reliability of the first flow guide body 302, the flow guide ribs 303, and the limiting outer protrusions 309. Furthermore, the integral structure has high overall strength and stability, is easy to assemble, and has a long service life.

[0081] According to some embodiments of the present application, referring to Figure 3 and Figure 14 The shell 1 has a containing cavity 13 therein. An air inlet 14 and an air outlet 15 are formed on the shell 1 and communicate with the containing cavity 13. The upstream impeller 20 is arranged adjacent to the air inlet 14, and the downstream impeller 20 is arranged 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. That is, the gas outside the fan assembly 100 enters the containing cavity 13 through the air inlet 14, is pressurized by the plurality of impellers 20 in sequence, and is then discharged through the air outlet 15. In this way, the vacuum degree in the containing cavity 13 can be improved, that is, the pressure difference between the outside and the inside of the fan assembly 100 is increased, so that the air outside the fan assembly 100 can enter the inside of the shell 1 more quickly, thereby improving the suction of the fan assembly 100 and the dust collection efficiency of the dust collector.

[0082] Optionally, the cavity wall of the accommodating cavity 13 is smoothly transitioned with the inner peripheral wall of the impeller inlet 201 of the impeller 20 on the downstream side. That is, at the impeller inlet 201 of the impeller 20 on the downstream side, the inner diameter of the cavity wall of the accommodating cavity 13 is the same as the inner diameter of the impeller inlet 201, so that the gas flow can flow into the impeller inlet 201 more stably, and the gas turbulence can be better avoided, which is conducive to reducing the gas flow loss.

[0083] According to some embodiments of the present application, with reference to Figure 3 and Figure 4 , the fan assembly 100 further comprises a sealing piece 8 filled between the outer peripheral edge of the impeller inlet 201 and the cavity wall of the accommodating cavity 13. Thus, the gas flow can be better avoided from flowing through the gap between the impeller inlet 201 and the cavity wall of the accommodating cavity 13, so that the gas flow loss can be reduced, which is conducive to improving the aerodynamic performance of the fan assembly 100.

[0084] In addition, in the assembly process of the impeller 20, the sealing piece 8 can better avoid the collision damage caused by the impeller 20 and the shell 1, and in the operation process of the fan assembly 100, the resonance noise generated by the abutment of the impeller 20 and the shell 1 can be better avoided, which is conducive to improving the overall structural stability of the fan assembly 100, and can better reduce the resonance noise, and improve the quietness of the fan assembly 100.

[0085] In some embodiments, with reference to Figure 3 and Figure 14 , the plurality of impellers 20 at least includes: a first-stage impeller 20a and a second-stage impeller 20b, wherein the first-stage impeller 20a is arranged adjacent to the air inlet 14, the first flow guide 3 is arranged on the downstream side of the first-stage impeller 20a, the second-stage impeller 20b is arranged on the downstream side of the first flow guide 3, and the driving piece 7 is arranged on the downstream side of the second-stage impeller 20b.

[0086] That is, in the gas flow direction of the fan assembly 100, the first-stage impeller 20a is first used for pressurization, the first flow guide 3 is used for guiding the pressurized gas flow of the first-stage impeller 20a to the second-stage impeller 20b, and the second-stage impeller 20b is used for increasing the gas flow again, and the gas flow is discharged from the fan assembly 100 through the impeller outlet 202 and the air outlet 15. That is, the gas flow completes two pressurizations in the fan assembly 100, which can better improve the vacuum degree in the accommodating cavity 13, that is, increase the pressure difference between the outside and the inside of the fan assembly 100, so that the air outside the fan assembly 100 can enter the inside of the shell 1 more quickly, thereby improving the suction of the fan assembly 100, and further improving the dust collection efficiency of the dust collector. In one specific example, the rotation of the output shaft 71 of the driving piece 7 in the present application is between 60-100 thousand revolutions, and the suction of the dust collector is higher than that of the 12-18 thousand revolutions fan in the related art.

[0087] In some embodiments, the number of blades 21 of the first-stage impeller 20a is N1, the second-stage impeller 20b is arranged downstream of the first guide member 3, the number of blades 21 of the second-stage impeller 20b is N2, and the number of guide ribs 303 of the first guide member 3 is N3, where N3>N1 and N3>N2, that is, the number of guide ribs 303 of the first guide member 3 is greater than the number of blades 21 of the impeller 20 adjacent to the first guide member 3. In this way, the flow area of the sub-guide air duct 301 defined by two circumferentially adjacent guide ribs 303 is smaller than the flow area of the sub-impeller air duct 203 defined by two circumferentially adjacent blades 21, so that the flow velocity of the air flow at the impeller outlet 202 of the first-stage impeller 20a can be increased when the air flow passes through the sub-guide air duct 301 of the first guide member 3, thereby improving the flow efficiency of the air flow between the first-stage impeller 20a and the second-stage impeller 20b.

[0088] Further, the number N1 of blades 21 of the first-stage impeller 20a and the number N2 of blades 21 of the second-stage impeller 20b satisfy the relationship N1>N2. In this way, since the first-stage impeller 20a is closer to the air inlet 14 of the housing 1 in the flow direction of the air flow, the number of blades 21 of the first-stage impeller 20a is set to be greater than the number of blades 21 of the second-stage impeller 20b, which is advantageous to improve the suction of the fan assembly 100. On the other hand, the relatively small number of blades 21 of the second-stage impeller 20b makes the flow area of the second-stage sub-impeller outlet 205 larger, which is advantageous to reduce the air resistance of the air flow inside the housing 1, thereby improving the exhaust efficiency.

[0089] In some embodiments, the outer diameter of the first-stage impeller 20a is D11, the spacing 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 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. In this way, it can be avoided that the ratio of D11 to L1 is too small, for example, less than 1.27, so that the space between the first-stage impeller 20a and the second-stage impeller 20b for installing the first guide member 3 is too small, which affects the efficiency of the air flow through the guide channel. It can also be avoided that the ratio of D11 to L1 is too large, for example, greater than 1.87, so that the distance between the first-stage impeller 20a and the second-stage impeller 20b is too large, which results in a large air resistance of the air flow when passing through the guide air duct 301 and a large loss of air volume, thereby reducing the suction of the fan assembly 100.

[0090] Further, the outer diameter D11 of the first impeller 20a is in a range of 37mm≤D11≤43mm, for example, the outer diameter D11 of the first impeller 20a can be 37mm, 38mm, 40mm, 41mm or 43mm, so that the outer diameter of the first impeller 20a is not too large, for example, greater than 43mm, which leads to the overall radial size of the fan assembly 100 being too large, occupying a larger space, and is not conducive to the miniaturization and portability of the dust collector, and the outer diameter of the first impeller 20a is not too small, for example, less than 37mm, which leads to the wind generated by the first impeller 20a being too small, resulting in the suction of the dust collector being too small.

[0091] According to some embodiments of the application, the outer diameter of the second impeller 20b is D21, the spacing of the first impeller 20a and the second impeller 20b along the axial direction of the fan assembly 100 is L1, and the ratio of D21 to L1 is in a range of 1.27≤D21 / L1≤1.87, for example, the ratio of D21 to L1 can be 1.27, 1.37, 1.47, 1.67 or 1.87, so that the ratio of D21 to L1 is not too small, for example, less than 1.27, which leads to the space between the first impeller 20a and the second impeller 20b for installing the first flow guide 3 being too small, affecting the efficiency of airflow passing through the flow guide channel, and the ratio of D21 to L1 is not too large, for example, greater than 1.87, which leads to the distance between the first impeller 20a and the second impeller 20b being too large, resulting in a large air resistance of the airflow passing through the flow guide duct 301 and a large loss of air volume caused thereby, reducing the suction of the fan assembly 100.

[0092] Further, the outer diameter D21 of the second impeller 20b is in a range of 37mm≤D21≤43mm, for example, the outer diameter D21 of the second impeller 20b can be 37mm, 38mm, 40mm, 41mm or 43mm, so that the outer diameter of the second impeller 20b is not too large, for example, greater than 43mm, which leads to the overall radial size of the fan assembly 100 being too large, occupying a larger space, and is not conducive to the miniaturization and portability of the dust collector, and the outer diameter of the second impeller 20b is not too small, for example, less than 37mm, which leads to the wind generated by the second impeller 20b being too small, and further leads to the suction of the dust collector being too small.

[0093] In some embodiments, the spacing between the first flow guide 3 and the second impeller 20b in the axial direction of the fan assembly 100 is L2, the spacing between the first impeller 20a and the second impeller 20b in the axial direction of the fan assembly 100 is L1, and the ratio of L2 and L1 is in the range of 0.13≤L2 / L1≤0.26, for example, the ratio of L2 and L1 can be 0.13, 0.18, 0.2, 0.25 or 0.26, so that when the ratio of L2 and L1 is too small, for example, less than 0.13, the spacing between the first flow guide 3 and the second impeller 20b in the axial direction of the fan assembly 100 is too small, which causes the air flow in the flow guide duct 301 to be difficult to enter the impeller inlet 201 of the second impeller 20b, thereby reducing the flow efficiency of the air flow. When the ratio of L2 and L1 is too large, for example, greater than 0.26, the spacing between the first flow guide 3 and the second impeller 20b in the axial direction of the fan assembly 100 is too large, and the flow guiding effect of the first flow guide 3 is attenuated, which causes vortex between the first flow guide 3 and the second impeller 20b, and the air flow is not smooth and the air volume is further reduced.

[0094] According to some embodiments of the present application, in the direction of the air flow, the cross-sectional area of the impeller outlet 202 of the impeller 20 on the upstream side is greater than the cross-sectional area of the impeller outlet 202 of the impeller 20 on the downstream side, that is, the cross-sectional area of the impeller outlet 202 of the first impeller 20a is greater than the cross-sectional area of the impeller outlet 202 of the second impeller 20b. For example, when the outer diameter of the first impeller 20a and the outer diameter of the second impeller 20b are the same, the width of the impeller outlet 202 of the first impeller 20a in the axial direction of the impeller 20 can be set to be greater than the width of the impeller outlet 202 of the second impeller 20b in the axial direction of the impeller 20, so that the cross-sectional area of the impeller outlet 202 of the first impeller 20a is greater than the cross-sectional area of the impeller outlet 202 of the second impeller 20b. In this way, the flow rate of the air flow after passing through the first impeller 20a and the second impeller 20b in turn can be significantly increased, thereby increasing the air power to increase the suction force of the dust collector.

[0095] Further, the outer diameter of the first impeller 20a is D11, and the outer diameter of the second impeller 20b is D21, D11=D21, that is, the radial dimensions of the first impeller 20a and the second impeller 20b are the same, so that the overall structure of the fan assembly 100 can have equal diameters at different positions in the axial direction, thereby facilitating the miniaturization of the overall structure of the fan assembly 100 while ensuring that the fan assembly 100 can provide sufficient suction force.

[0096] In some embodiments, the inner diameter of the first impeller 20a is D12, and D12 is in the range of 18mm≤D12≤21mm, for example, the inner diameter of the first impeller 20a can be 18mm, 19mm, 20mm or 21mm, the inner diameter of the second impeller 20b is D22, and D22 is in the range of 18mm≤D21≤21mm, for example, the inner diameter of the second impeller 20b can be 18mm, 19mm, 20mm or 21mm, and D12≥D22. Here, the inner diameter of the first impeller 20a is D12, which means that the inner diameter of the impeller inlet 201 of the first impeller 20a is D12, and the inner diameter of the second impeller 20b is D22, which means that the inner diameter of the impeller inlet 201 of the second impeller 20b is D22. The opening area of the impeller inlet 201 of the first impeller 20a is larger than that of the impeller inlet 201 of the second impeller 20b. Since the first impeller 20a is closer to the air inlet 14 of the housing 1, the opening area of the impeller inlet 201 of the first impeller 20a is set to be larger than that of the impeller inlet 201 of the second impeller 20b, which is conducive to improving the air intake of the impeller assembly 2. At the same time, under the condition that the air flow through the first impeller 20a and the second impeller 20b is constant, the flow rate of the airflow through the second impeller 20b is further increased due to the smaller opening area of the impeller inlet 201 of the second impeller 20b, thereby improving the suction of the dust collector. In addition, the range of the inner diameter of the first impeller 20a and the second impeller 20b is set to be 18mm-21mm, which is conducive to realizing the miniaturization of the overall structure of the fan assembly 100 in the radial direction.

[0097] According to some embodiments of the present application, the width of the first impeller outlet 202a of the first impeller 20a is B11, and the width of the second impeller outlet 202b of the second impeller 20b is B21, wherein B11>B21. In this way, the flow rate of the airflow after passing through the first impeller 20a and the second impeller 20b in sequence can be significantly increased, thereby increasing the wind power to increase the suction of the dust collector. It should be noted that the width of the impeller outlet 202 here refers to the width of the impeller outlet 202 in the axial direction of the impeller 20, i.e., the distance between the outer edge of the wheel cover 22 and the outer edge of the wheel disc 23 in the axial direction of the impeller 20.

[0098] 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.

[0099] 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.

[0100] 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, 0.9 or 1. 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, for example less than 0.8. It can also prevent the flow area of ​​the secondary impeller 20b air duct from being too large, for example greater than 1, which would result in the secondary impeller 20b having an insignificant or no effect on increasing the airflow velocity.

[0101] 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.

[0102] In some embodiments, the number of blades 21 of the plurality of impellers 20 decreases in the air flow direction, that is, the number of blades 21 of the second impeller 20b is less than the number of blades 21 of the first impeller 20a, so that the air resistance of the air flow passage inside the housing 1 can gradually decrease, which is beneficial to improve the exhaust efficiency, and in turn is beneficial to improve the dust collection efficiency of the dust collector.

[0103] Further, the number of blades 21 of the first impeller 20a is N1, and N1 is in the range of 8≤N1≤12, for example, N1 can be 8, 9, 10, 11 or 12; the number of blades 21 of the second impeller 20b is N2, and N2 is in the range of 7≤N2≤11, for example, N2 can be 7, 8, 9, 10 or 12, and N1 and N2 satisfy N2<N1, so that the air resistance of the air flow passage inside the housing 1 can gradually decrease, which is beneficial to improve the exhaust efficiency, and in turn is beneficial to improve the dust collection efficiency of the dust collector.

[0104] According to some embodiments of the present application, the first impeller 20a and the second impeller 20b are located on the same side of the motor assembly in the axial direction, so that the distance between the first impeller 20a and the second impeller 20b can be shortened, thereby shortening the length of the air flow path, which is helpful to reduce the wind loss.

[0105] In some embodiments, the distance between the first impeller 20a and the second impeller 20b along the axial direction of the fan assembly 100 is L1, the width of the first impeller outlet 202a of the first impeller 20a is B11, and B11 and L1 satisfy the relationship 0.14≤B11 / L1≤0.17, for example, B11 / L1 can be 0.14, 0.15, 0.16 or 0.17, so that when B11 / L1 is too small, the width of the first impeller outlet 202a is too small, which causes the air resistance at the first impeller outlet 202a to be too large, thereby increasing the air volume loss, and 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.

[0106] Further, the spacing of the first impeller 20a and the second impeller 20b along the axial direction of the fan assembly 100 is L1, the width of the second impeller outlet 202b of the second impeller 20b is B21, and B21 and L1 satisfy the relationship: 0.14≤B21 / L1≤0.17, for example, B21 / L1 can be 0.14, 0.15, 0.16 or 0.17, so that the wind resistance at the second impeller outlet 202b is not too small, and the wind loss is not increased, and the axial length of the fan assembly 100 is not too large, which is not conducive to miniaturization.

[0107] Further, the spacing of the first impeller 20a and the second impeller 20b along the axial direction of the fan assembly 100 is L1, the width of the second impeller outlet 202b of the second impeller 20b is B21, and B21 and L1 satisfy the relationship: 0.14≤B21 / L1≤0.17, for example, B21 / L1 can be 0.14, 0.15, 0.16 or 0.17, so that the wind resistance at the second impeller outlet 202b is not too small, and the wind loss is not increased, and the axial length of the fan assembly 100 is not too large, which is not conducive to miniaturization.

[0108] According to some embodiments of the application, the impeller outlet 202 comprises a plurality of sub-impeller outlets arranged at intervals along the circumferential direction of the impeller 20, the cross-sectional area of the sub-impeller outlet of the impeller 20 located upstream is greater than the cross-sectional area of the sub-impeller outlet of the impeller 20 located downstream, that is, the impeller outlet 202 of each impeller 20 can be composed of a plurality of sub-impeller outlets arranged at intervals along the circumferential direction of the impeller 20, each sub-impeller outlet can be defined by two adjacent blades 21 and the disc 23, the disc 23, the cross-sectional area of the first sub-impeller outlet of the first impeller 20a is greater than the cross-sectional area of the second sub-impeller outlet of the second impeller 20b, so that the overall layout of the fan assembly 100 is conducive to increasing the wind speed, thereby making the suction of the dust collector stronger.

[0109] According to some embodiments of the present application, referring to Figure 11 and Figure 15 , the fan assembly 100 can further comprise a second flow guide 4. The second flow guide 4 is arranged between the first flow guide 3 and the impeller 20 on the upstream side of the first flow guide 3 to guide the air outlet of the impeller outlet 202 of the impeller 20 on the upstream side to the flow guide air duct 301, in other words, the second flow guide 4 is arranged between the first flow guide 3 and the primary impeller 20a, and the second flow guide 4 can guide the air outlet of the primary impeller outlet 202a to the flow guide air duct 301 defined by the first flow guide 3 and the inner wall of the housing 1. In this way, by arranging the second flow guide 4, the air resistance between the primary impeller outlet 202a and the flow guide air duct 301 can be reduced, the wind power loss can be reduced, and the air flow efficiency of the fan assembly 100 can be improved.

[0110] According to some embodiments of the present application, the second flow guide 4 can be annular, and the second flow guide 4 is arranged on the outside of the impeller 20 on the upstream side, that is, the second flow guide 4 can be arranged on the outside of the primary impeller 20a, for example Figure 15 as shown, the second flow guide 4 is formed as a second flow guide ring, and the second flow guide ring is arranged on the outer circumferential side of the primary impeller outlet 202a to guide the air outlet of the primary impeller outlet 202a to the flow guide air duct 301. In this way, the second flow guide 4 can guide the air outlet of the primary impeller outlet 202a at any position in the circumferential direction, and the structure is simple and easy to manufacture.

[0111] In some embodiments, referring to Figure 11 , an annular micro gap is formed in the radial direction between the second flow guide 4 and the impeller 20 on the upstream side, that is, in the radial direction of the impeller 20, the second flow guide 4 is spaced apart from the primary impeller 20a and an annular micro gap is formed, which can avoid interference of the second flow guide 4 with the movement of the primary impeller 20a, and facilitates assembly.

[0112] According to some embodiments of the present application, the first flow guide 3 has a mounting surface 318, which is a surface of the first flow guide 3 close to the impeller 20 on the upstream side, and the second flow guide 4 is mounted on the mounting surface 318, for example Figure 1 as shown, the diameter of the mounting surface 318 is greater than the diameter of the primary impeller 20a, so that the part of the mounting surface 318 in the radial direction beyond the impeller 20 is formed as a mounting space, and the second flow guide 4 can be mounted in the mounting space of the mounting surface 318. In this way, the mounting of the second flow guide 4 can be more stable, which is also conducive to improving the space utilization of the fan assembly 100, and facilitates the air outlet of the primary impeller outlet 202a to be guided by the second flow guide 4.

[0113] Further, the second flow guide 4 comprises a second flow guide body 41 and a second flow guide mounting portion 42, wherein the second flow guide mounting portion 42 is arranged on the second flow guide body 41, the first flow guide mounting portion 319 is formed on the mounting surface 318, and the second flow guide mounting portion 42 is detachably connected with the first flow guide mounting portion 319, so that the installation and disassembly of the second flow guide 4 and the first flow guide 3 can be facilitated, for example, the first flow guide mounting portion 319 and the second flow guide mounting portion 42 can be inserted and clamped, of course, the specific connection mode of the first flow guide mounting portion 319 and the second flow guide mounting portion 42 is not limited here, and the connection mode of the first flow guide mounting portion 319 and the second flow guide mounting portion 42 can be reasonably selected according to actual needs.

[0114] Further, referring to Figure 11 , the first flow guide mounting portion 319 is configured as a first mounting groove, and the second flow guide mounting portion 42 is configured as a second mounting protrusion, for example, the second flow guide mounting portion 42 can be formed by at least part of the protrusion of the side surface of the second flow guide body 41 facing the first flow guide 3 in the radial direction, the second mounting protrusion can be inserted into the first mounting groove, so that the connection of the first flow guide 3 and the second flow guide 4 is more stable, and the disassembly is facilitated, of course, the present application is not limited thereto, and the first flow guide mounting portion 319 can also be formed as a first mounting protrusion, and the second flow guide mounting portion 42 can be configured as a second mounting groove.

[0115] According to some embodiments of the present application, the second flow guide 4 comprises a second flow guide body 41. The second flow guide body 41 has a second flow guide body flow guide surface 411 and a second flow guide body pressing surface 412, wherein the second flow guide body pressing surface 412 is matched and pressed against the mounting surface 318, and the second flow guide body flow guide surface 411 is used to guide the air outlet of the first-stage impeller outlet 202a to the flow guide air duct 301, for example Figure 11 As shown in the figure, the second flow guide body pressing surface 412 is opposite to the mounting surface 318 in the axial direction of the first-stage impeller 20a, at the same time, the second flow guide body pressing surface 412 and the second flow guide mounting portion 42 are arranged radially inside and outside, and the second flow guide body pressing surface 412 is located radially inside the second flow guide mounting portion 42, the second flow guide body pressing surface 412 and the second flow guide mounting portion 42 are formed as a stepped structure, the second flow guide body flow guide surface 411 faces the outer shell 1, and the second flow guide body flow guide surface 411 is formed as a curved surface, so that the second flow guide body pressing surface 412 helps to stably match the second flow guide 4 and the first flow guide 3, and the second flow guide body flow guide surface 411 can reduce air resistance and air volume loss while realizing flow guide.

[0116] Further, the impeller outlet 202 of the impeller 20 on the upstream side has an impeller outlet 202 lower edge, the inner periphery of the second guide body guide surface 411 extends to a position adjacent to the impeller outlet 202 lower edge, and the outer periphery of the second guide body guide surface 411 extends to the junction of the mounting surface 318 of the first guide 3 and the outer peripheral surface of the first guide 3, in other words, the inner periphery of the second guide body guide surface 411 extends to a position adjacent to the edge of the wheel disc 23 of the first-stage impeller 20a, and the outer periphery of the second guide body guide surface 411 extends to the junction with the outer peripheral surface of the first guide 3, so that the second guide body guide surface 411 can better guide the air outlet of the first-stage impeller outlet 202a into the guide air duct 301, reducing air volume loss.

[0117] Further, the second guide body guide surface 411 and the outer peripheral surface of the first guide 3 are smoothly transitioned, for example, the second guide body guide surface 411 can be tangent to the outer peripheral surface of the second guide 4, so as to further reduce the air resistance at the connection between the second guide body guide surface 411 and the outer peripheral surface of the second guide 4, reduce air volume loss, and improve air outlet efficiency.

[0118] According to some embodiments of the present application, referring to Figure 11 , the inner peripheral surface of the housing 1 is formed with an upstream guide surface corresponding to the upstream impeller 20, the upstream guide surface corresponds to the second guide body guide surface 411 and forms an upstream transition air duct 43 therebetween, the upstream transition air duct 43 communicates the impeller outlet 202 and the guide inlet of the guide air duct 301, for example Figure 11 , the part of the inner wall of the housing 1 adjacent to the first-stage impeller outlet 202a is formed as an upstream guide surface, the upstream guide surface is formed as a curved surface, the upstream guide surface and the second guide body guide surface 411 define the upstream transition air duct 43 therebetween, one end of the upstream transition air duct 43 communicates with the first-stage impeller outlet 202a, and the other end communicates with the guide inlet of the guide air duct 301, since the upstream guide surface and the second guide body guide surface 411 are both formed as curved surfaces, the upstream transition air duct 43 is also formed as a curved surface, so that the upstream transition air duct 43 can reduce air resistance while guiding air, reducing air volume loss, and improving air outlet efficiency.

[0119] Further, referring to Figure 11 , the cross-sectional area of the upstream transition air duct 43 decreases from the impeller outlet 202 to the guide inlet of the guide air duct 301, in other words, the cross-sectional area of the upstream transition air duct 43 can gradually decrease in the direction from the first-stage impeller outlet 202a to the guide air duct 301, so as to help improve air flow rate, form negative pressure inside the fan assembly 100, and further improve the suction force of the dust collector.

[0120] In a specific example, as Figure 1 andFigure 3 As shown, the axial direction of the primary impeller 20a, the first flow guide 3 and the secondary impeller 20b of the fan assembly 100 are coaxially arranged, the output shaft 71 of the driving member 7 is fixedly connected with the primary impeller 20a and the secondary impeller 20b, and is rotatably connected with the first flow guide 3. Thus, the space occupied by the impeller assembly 2 in the axial direction can be reduced, which is conducive to reducing the axial size of the fan assembly 100 and facilitating the lightweight design of the dust collector. In addition, the output shaft 71 of the driving member 7 can be coaxially arranged with the plurality of impellers 20, so that the output shaft 71 of the driving member 7 can be simultaneously connected with the plurality of impellers 20, thereby reducing the number of driving members 7, saving the space occupied by the driving members 7, and further reducing the size of the fan assembly 100, which is conducive to the lightweight design of the dust collector and low cost.

[0121] In some embodiments of the present application, with reference to Figure 2 The shell 1 includes a shell body 11 and a cover 12, the shell body 11 is adapted to cooperate with the cover 12 to define a containing cavity 13, an air inlet 14 is formed on the cover 12, and the shell body 11 and the cover 12 are detachably connected. Thus, by detaching the cover 12 from the shell body 11, the impeller assembly 2 and the like can be easily installed into the containing cavity 13, thereby reducing the assembly difficulty of the fan assembly 100.

[0122] The cover 12 covers the primary impeller 20a, the cover 12 forms an annular groove 18 surrounding the air inlet 14, the annular groove 18 faces the first flow guide 3, and the outer periphery of the impeller inlet 201 of the primary impeller 20a is located in the annular groove 18. Thus, by aligning the annular groove 18 with the impeller inlet 201 of the primary impeller 20a, the positioning of the cover 12 and the primary impeller 20a can be quickly achieved, which is conducive to improving the assembly efficiency of the fan assembly 100. Moreover, the airflow passing through the air inlet 14 can all enter the primary impeller 20a, which can better avoid the gas flow loss.

[0123] In one specific example, with reference to Figure 2 and Figure 4 The cover 12 includes a cover body 121, a first bending portion 122 and a second bending portion 123, the upper end of the cover body 121 is bent towards the air outlet 15 to form the first bending portion 122, the end of the first bending portion 122 away from the cover body 121 is bent towards the primary impeller 20a to form the second bending portion 123, and the cover body 121, the first bending portion 122 and the second bending portion 123 jointly define the annular groove 18, i.e., the second bending portion 123 defines the air inlet 14, so that the airflow can directly enter the impeller inlet 201 along the second bending portion 123.

[0124] According to some embodiments of the present application, with reference to Figure 3 andFigure 4 The sealing member 8 comprises a first sealing member 81 and a second sealing member 82. The first sealing member 81 is used to seal the gap between the annular groove 18 and the primary impeller 20a. That is, at least a part of the first sealing member 81 is located in the annular groove 18 to better fill the gap between the cover 12 and the impeller inlet 201 of the primary impeller 20a by the first sealing member 81. As shown in Figure 3 The second sealing member 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 accommodating cavity 13. That is, the second sealing member 82 is filled between the outer periphery of the impeller outlet 202 of the secondary impeller 20b and the cavity wall of the accommodating cavity 13. In this way, the airflow can be better prevented from flowing through the gap between the primary impeller 20a, the secondary impeller 20b and the cavity wall of the accommodating cavity 13, so that the airflow loss can be reduced, and the aerodynamic performance of the fan assembly 100 can be improved. In addition, the resonance noise generated by the abutment of the impeller 20 and the shell 1 can be better avoided.

[0125] According to some embodiments of the present application, with reference to Figure 15 The fan assembly 100 further comprises a first bearing 10. The outer ring of the first bearing 10 is fixedly connected with the first flow guide 3, and the output shaft 71 of the driving member 7 penetrates the inner ring of the first bearing 10. In this way, while ensuring that the output shaft 71 of the driving member 7 can rotate relative to the first flow guide 3, the first bearing 10 is limited by the first flow guide 3, so that the eccentric swing of the output shaft 71 of the driving member 7 can be better inhibited, and the stability of the fan assembly 100 can be improved.

[0126] Further, with reference to Figure 15 The fan assembly 100 further comprises a bearing seat 9, which is arranged between the first flow guide 3 and the first bearing 10. In this way, the bearing seat 9 can better buffer the force transmitted by the output shaft 71 of the driving member 7 to the first bearing 10, so that the vibration of the driving member 7 and other disturbances to the first flow guide 3 can be better reduced, and the stability of the fan assembly 100 can be improved. The bearing seat 9 is detachably arranged on the first flow guide 3, which reduces the installation difficulty of the bearing and facilitates the later maintenance.

[0127] Further, with reference to Figure 1 and Figure 3 The bearing seat 9 has a bearing mounting groove 92 for accommodating the first bearing 10, and the output shaft 71 of the driving member 7 penetrates the first bearing 10. In this way, the installation difficulty of the first bearing 10 can be better reduced. Further, in the airflow direction of the fan assembly 100, the spacing between the bearing seat 9 and the upstream impeller 20 is not less than the spacing between the first flow guide 3 and the upstream impeller 20. That is, the spacing between the bearing seat 9 and the upstream impeller 20 can be equal to the spacing between the first flow guide 3 and the upstream impeller 20, as shown inFigure 3 As shown, the upper end surface of the first flow guide body 302 is at the same level as the upper end surface 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 flow guide 3 and the upstream impeller 20. It can be understood that the output shaft 71 of the driving member 7 is in transmission connection with the impeller 20, and the first flow guide 3 is rotatably connected with the impeller 20, so that the impeller 20 is rotatable relative to the first flow guide 3. Thus, the bearing seat 9 can be better avoided from interfering with the rotation of the impeller 20, which is beneficial to improve the stability of the fan assembly 100. Moreover, the space of the fan assembly 100 in the axial direction can be better saved, and the layout is reasonable.

[0128] The first flow guide 3 forms a limiting groove 312 accommodating the bearing seat 9 on the axial end surface of the upstream impeller 20. Thus, the installation and positioning difficulty of the bearing seat 9 can be better reduced, which is beneficial to improve the assembly efficiency of the fan assembly 100, and the firm connection between the bearing seat 9 and the first flow guide 3 can be better ensured. Further, the bottom wall of the limiting groove 312 forms the first flow guide through hole 310, and the output shaft 71 of the driving member 7 penetrates the first flow guide through hole 310. Thus, the rotatable connection between the output shaft 71 of the driving member 7 and the first flow guide 3 can be better achieved, and the output shaft 71 of the driving member 7 can be conveniently connected with the upstream impeller 20 in transmission.

[0129] According to some embodiments of the present application, referring to Figure 3 and Figure 16 , the bearing seat 9 can include a main body part 91, an outer ring part 94 and a connecting part 95. Specifically, the bearing mounting groove 92 is formed on the main body part 91, and the bottom wall of the bearing mounting groove 92 forms the bearing seat through hole 93 opposite to the first flow guide through hole 310. That is, the first bearing 10 is arranged on the main body part 91, and the output shaft 71 of the driving member 7 can penetrate the bearing seat through hole 93 and cooperate with the bearing.

[0130] Further, the outer ring part 94 is arranged on the outer circumferential side of the main body part 91, and the outer ring part 94 is coaxially arranged with the main body part 91, and the two ends of the connecting part 95 are connected with the opposite side walls of the main body part 91 and the outer ring part 94. That is, the outer ring part 94 is located radially outside the main body part 91, one end of the connecting part 95 is connected with the side of the outer ring part 94 facing the main body part 91, and the other end of the connecting part 95 is connected with the outer circumferential wall of the main body part 91. Thus, the connecting part 95 can connect the main body part 91 and the outer ring part 94, so that when the torque on the output shaft 71 of the driving member 7 is transmitted to the main body part 91 through the bearing, the main body part 91 can be dispersed to the outer ring part 94 through the connecting part 95, so that the position stress concentration of the main body part 91 can be better avoided, so that the force can be better avoided from being further transmitted to the first flow guide 3, which is beneficial to improve the structural strength of the first flow guide 3.

[0131] The main body 91, the outer ring part 94 and the connecting part 95 are all embedded in the limiting groove 312. That is, the limiting groove 312 can well accommodate the main body 91, the outer ring part 94 and the connecting part 95, so as to further improve the fixing strength of the first flow guide 3 to the bearing seat 9.

[0132] Optionally, a plurality of connecting parts 95 are arranged on the outer peripheral wall of the main body 91. Thus, the plurality of connecting parts 95 are arranged on the outer peripheral wall of the main body 91 and connected with the outer ring part 94, so that the torque acting on the main body 91 can be well dispersed through the plurality of connecting parts 95, ensuring the firm connection between the main body 91 and the outer ring part 94, and facilitating the improvement of the structural strength of the bearing seat 9.

[0133] According to some embodiments of the present application, referring to Figures 7-9 The limiting groove 312 comprises 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, the main body 91 is accommodated in the first limiting groove 313, the bottom wall of the first limiting groove 313 forms the first flow guide through hole 310, the second limiting groove 314 extends along the circumferential direction of the fan assembly 100, the second limiting groove 314 is annular, the outer ring part 94 is accommodated in the second limiting groove 314, the third limiting groove 315 extends along the radial direction of the fan assembly 100, the two ends of the third limiting groove 315 are respectively communicated with the first limiting groove 313 and the second limiting groove 314, and the connecting part 95 is located in the third limiting groove 315.

[0134] Thus, by limiting the connecting part 95 through 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 well limited, so as to well avoid the abrasion caused by the relative movement between the bearing seat 9 and the first flow guide 3. In addition, the alignment difficulty of the bearing seat 9 and the limiting groove 312 can be well reduced, facilitating the improvement of the assembly efficiency of the fan assembly 100.

[0135] Further, the third limiting groove 315 comprises a first limiting sub-groove 316 and a second limiting sub-groove 317 arranged along the axial direction of the fan assembly, at least part of the connecting part 95 is located in the second limiting sub-groove 317, and in the circumferential direction of the fan assembly 100, the width of the first limiting sub-groove 316 is greater than the width of the second limiting sub-groove 317.

[0136] Thus, by the second limiting sub-groove 317, a certain gap can be well formed between the connecting part 95 and the side wall opposite to the second limiting sub-groove 317, so as to facilitate the grasping of the connecting part 95 through the above gap and the disassembly of the bearing seat 9, and the material input of the first flow guide 3 can be well reduced, and the weight is relatively light.

[0137] In one example of the present application, the connecting portion 95 comprises a first connecting sub-portion 951 and a second connecting sub-portion 952 arranged along the axial direction of the fan assembly 100, and the width of the first connecting sub-portion 951 is greater than the width of the second connecting sub-portion 952 in the circumferential direction of the fan assembly 100. The first limiting sub-groove 316 is adapted to accommodate the first connecting sub-portion 951, and the second limiting sub-groove 317 is adapted to accommodate the second connecting sub-portion 952. In this way, the connection strength of the outer ring portion 94 and the main body portion 91 can be improved, i.e., the structural strength of the bearing seat 9 can be improved, and in addition, the contact area of the connecting portion 95 with the outer ring portion 94 and the main body is increased, further limiting the rotation of the bearing seat 9 relative to the first flow guide 3.

[0138] According to some embodiments of the present application, the side of the bearing seat 9 away from the upstream impeller 20 is provided with a support 96 extending in the axial direction of the fan assembly 100 away from the upstream impeller 20, and the limiting groove 312 has a support through-hole 311 accommodating the support 96. In this way, the support 96 is inserted into the support through-hole 311, so that the rotation of the bearing seat 9 relative to the first flow guide 3 is limited by the limiting of the support 96 by the first flow guide 3, and in turn, the abrasion caused by the relative movement of the bearing seat 9 and the first flow guide 3 can be avoided.

[0139] Alternatively, the support 96 is arranged on the side of the outer ring portion 94 away from the upstream impeller 20 and extends away from the upstream impeller 20, and the support through-hole 311 is formed on the bottom wall of the second limiting groove 314 and extends in the axial direction of the fan assembly 100. In this way, the support 96 can be inserted into the support through-hole 311 in the axial direction of the fan assembly 100, and the assembly difficulty of the bearing seat 9 can be reduced.

[0140] Alternatively, a plurality of supports 96 are arranged, and the plurality of supports 96 are arranged in the circumferential direction of the main body portion 91. Therefore, a plurality of support through-holes 311 cooperating with the supports 96 are formed on the first flow guide 3, and the supports 96 are all arranged in the support through-holes 311, so that the rotation of the bearing seat 9 relative to the first flow guide 3 is further limited by the limiting of the plurality of supports 96 by the flow guide ribs 303, and in turn, the abrasion caused by the relative movement of the bearing seat 9 and the first flow guide 3 can be avoided.

[0141] In one specific example, the support post hole 311 penetrates the limiting outer protrusion 309, so that the support post 96 is arranged in the limiting outer protrusion 309. That is, the support post hole 311 is arranged in the limiting outer protrusion 309. It can be understood that the limiting outer protrusion 309 protrudes from the outer circumferential wall of the main body 91 and extends along the axial direction of the fan assembly 100. In this way, the support post hole 311 can have a longer extension length, and the support post 96 with a longer length can be arranged to further improve the connection strength between the first flow guide 3 and the bearing seat 9.

[0142] According to some embodiments of the present application, the fan assembly 100 further comprises a third flow guide (not shown in the figure) and a diffuser 6. The diffuser 6 is arranged at least partially in the air outlet 15, the diffuser 6 is arranged between the downstream impeller 20 and the air outlet 15, the diffuser 6 and the housing 1 define an air outlet air duct 63 therebetween, the air outlet air duct 63 communicates with the air outlet 15 of the housing 1, and the third flow guide is arranged between the downstream impeller 20 and the diffuser 6 to guide the air outlet of the downstream impeller outlet 202 to the air outlet air duct 63. In this way, by arranging the third flow guide, the air resistance between the secondary impeller outlet 202b and the air outlet air duct 63 is reduced, the wind power loss is reduced, and the air flow efficiency of the fan assembly 100 is further improved.

[0143] Further, the third flow guide is annular, and the third flow guide is arranged outside the downstream impeller 20, that is, the third flow guide can be arranged outside the secondary impeller 20b, for example Figure 1 As shown, the third flow guide is formed as a third flow ring, and the third flow ring is arranged outside the circumferential side of the secondary impeller outlet 202b to guide the air outlet of the secondary impeller outlet 202b to the flow guide air duct 301. In this way, the third flow guide can guide the air outlet of the secondary impeller outlet 202b at any position in the circumferential direction, and the structure is simple and easy to manufacture.

[0144] In some embodiments, the third flow guide and the downstream impeller 20 are spaced apart in the radial direction to form an annular micro gap, that is, in the radial direction of the impeller 20, the third flow guide and the secondary impeller 20b are spaced apart to form an annular micro gap. In this way, the movement of the third flow guide can be avoided to interfere with the secondary impeller 20b, and assembly is facilitated.

[0145] According to some embodiments of the present application, the diffuser 6 has a diffuser mounting surface, which is a surface of the diffuser 6 close to the impeller 20 on the downstream side, the third flow guide is mounted on the diffuser mounting surface, the diameter of the diffuser mounting surface is greater than the diameter of the second-stage impeller 20b, so that the part of the diffuser mounting surface in the radial direction beyond the impeller 20 is formed into a mounting space, the third flow guide can be mounted in the mounting space of the diffuser mounting surface, so that the installation of the third flow guide is more stable, which is also conducive to improving the space utilization of the fan assembly 100, and at the same time, it is also convenient for the third flow guide to guide the air outlet of the second-stage impeller 202b.

[0146] Further, the third flow guide comprises a third flow guide body and a third flow guide mounting portion, the third flow guide mounting portion is arranged on the third flow guide body, the diffuser mounting surface is formed with a diffuser mounting portion, and the third flow guide mounting portion is detachably connected with the diffuser mounting portion, so that the installation and disassembly of the third flow guide and the diffuser 6 are facilitated, for example, the third flow guide mounting portion and the diffuser mounting portion can be inserted and connected, of course, the specific connection mode of the third flow guide mounting portion and the diffuser mounting portion is not limited here, and the specific connection mode of the third flow guide mounting portion and the diffuser mounting portion can be reasonably selected according to actual needs.

[0147] Further, the diffuser mounting portion is configured as a diffuser mounting groove, and the third flow guide mounting portion is configured as a third mounting protrusion. For example, the third flow guide mounting portion can be formed by at least part of the side surface of the third flow guide body facing the diffuser 6 in the radial direction, and the third mounting protrusion can be inserted into the diffuser mounting groove, so that the connection of the third flow guide and the diffuser 6 is more stable, and disassembly is facilitated, of course, the present application is not limited thereto, and the diffuser mounting portion can also be configured as a third mounting protrusion, and the third flow guide mounting portion is configured as a third mounting groove.

[0148] According to some embodiments of the present application, the third flow guide comprises a third flow guide body. The third flow guide body has a third flow guide body flow guide surface and a third flow guide body pressing surface, wherein the third flow guide body pressing surface is matched to be pressed against the diffuser mounting surface, and the third flow guide body flow guide surface is used to guide the air outlet of the second-stage impeller outlet 202b to the air outlet duct 63, for example Figure 1As shown, the third flow guide body pressing surface is opposite to the diffuser mounting surface along the axial direction of the second impeller 20b, and the third flow guide body pressing surface and the third flow guide mounting portion are arranged radially inward and outward, and the third flow guide body pressing surface is located radially inward of the third flow guide mounting portion. The third flow guide body pressing surface and the third flow guide mounting portion form a stepped structure, the third flow guide body flow guide surface faces the shell 1, and the third flow guide body flow guide surface forms an arc surface. In this way, the third flow guide body pressing surface helps to stably match the third flow guide and the diffuser 6, and the third flow guide body flow guide surface can reduce wind resistance and wind loss while achieving flow guidance.

[0149] Further, the impeller outlet 202 of the upstream impeller 20 has an impeller outlet lower edge, the inner periphery of the third flow guide body flow guide surface extends to a position adjacent to the impeller outlet lower edge, and the outer periphery of the third flow guide body flow guide surface extends to the junction of the diffuser mounting surface 318 of the diffuser 6 and the outer peripheral surface of the diffuser 6. In other words, the inner periphery of the third flow guide body flow guide surface extends to a position adjacent to the edge of the disc 23 of the second impeller 20b, and the outer periphery of the third flow guide body flow guide surface extends to the junction with the outer peripheral surface of the diffuser 6. In this way, the third flow guide body flow guide surface can better guide the air outlet from the second impeller outlet 202b into the air outlet air duct 63, thereby reducing air loss.

[0150] Further, referring to Figure 1 and Figure 14 , the third flow guide body flow guide surface and the outer peripheral surface of the diffuser 6 smoothly transition, for example, the third flow guide body flow guide surface can be tangent to the outer peripheral surface of the diffuser 6, thereby further reducing the wind resistance at the junction of the third flow guide body flow guide surface and the outer peripheral surface of the diffuser 6, reducing air loss, and improving air outlet efficiency.

[0151] Further, the inner peripheral surface of the shell 1 forms a downstream flow guide surface corresponding to the downstream impeller 20, the downstream flow guide surface corresponds to the third flow guide body flow guide surface and forms a downstream transition air duct 5 therebetween, and the downstream transition air duct 5 communicates the impeller outlet 202 and the inlet of the air outlet air duct 63. For example, the portion of the inner wall of the shell 1 adjacent to the second impeller outlet 202b forms a downstream flow guide surface, the downstream flow guide surface forms an arc surface, the downstream flow guide surface and the third flow guide body flow guide surface define a downstream transition air duct 5 therebetween, one end of the downstream transition air duct 5 communicates with the second impeller outlet 202b, and the other end communicates with the inlet of the air outlet air duct 63. Since the downstream flow guide surface and the third flow guide body flow guide surface are both arc-shaped, the downstream transition air duct 5 is also arc-shaped. In this way, the downstream transition air duct 5 can reduce wind resistance and air loss while achieving flow guidance, which is conducive to improving air outlet efficiency.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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 drive member 7.

[0156] 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.

[0157] The radial air outlet of the impeller 20 on the upstream side can be adjusted towards the axial direction of the fan assembly 100 by the first flow guide 3. The driving member 7 is arranged axially spaced apart from the inner surface of the housing 1, so that the airflow can flow towards the impeller 20 on the downstream side through the gap between the driving member 7 and the housing 1.

[0158] Optionally, referring to Figure 14 The fan assembly 100 further comprises a converging portion 17, the impeller 20 on the downstream side is arranged on the downstream side of the converging portion 17, and the inner diameter of the converging portion 17 decreases in the direction of the driving member 7 towards the impeller 20 on the downstream side. The minimum inner diameter e of the converging portion 17 and the inner diameter d of the impeller inlet 201 on the downstream side satisfy: e = d. That is, the inner diameter of the converging portion 17 adjacent to one end of the impeller 20 on the downstream side is the same as the inner diameter of the impeller inlet 201 of the impeller 20 on the downstream side. Thus, the airflow downstream of the driving member 7 can be better converged by the converging portion 17, so that the airflow passing through the converging portion 17 can stably flow into the impeller inlet 201 on the downstream side, so that the converging portion 17 and the impeller inlet 201 on the downstream side can be better aligned, which is beneficial to improving the stability of the gas flow.

[0159] Embodiment one

[0160] The fan assembly 100 comprises a housing 1, an impeller assembly 2, a first flow guide 3, a bearing seat 9, a first bearing 10, a driving member 7 and a sealing member 8. The impeller assembly 2 comprises a primary impeller 20a and a secondary impeller 20b coaxially arranged with the first flow guide 3 and an output shaft 71 of the driving member 7. The primary impeller 20a and the secondary impeller 20b are located on the same side of the driving member 7 in the axial direction. The first flow guide 3 is located between the primary impeller 20a and the secondary impeller 20b. The output shaft 71 of the driving member 7 is in transmission connection with the primary impeller 20a and the secondary impeller 20b, and is rotatably connected with the first flow guide 3.

[0161] The housing 1 comprises a shell body 11 and a cover 12. The shell body 11 and the cover 12 jointly define a containing cavity 13. The cover 12 is detachably connected with the shell body 11. The side of the cover 12 away from the shell body 11 forms an air inlet 14 communicating with the containing cavity 13. The cover 12 covers the primary impeller 20a. The driving member 7 and the inner surface of the shell body 11 define an air outlet 15.

[0162] The primary impeller 20a and the secondary impeller 20b comprise a cover 22, a disc 23 and blades 21. Specifically, the cover 22 is formed with an impeller inlet 201 which can be open in the axial direction of the impeller 20, the disc 23 is arranged opposite to and spaced from the cover 22 in the axial direction of the impeller 20, the disc 23 and the cover 22 define an impeller air duct 203 therebetween, the inner end of the impeller air duct 203 in the radial direction can be communicated with the impeller inlet 201, the outer end of the impeller air duct 203 in the radial direction is formed with an impeller outlet 202, and a plurality of blades 21 are arranged in the air duct in the circumferential direction of the impeller inlet 201, each blade 21 can form an arc which is curved radially relative to the impeller 20, and any two adjacent blades 21 in the circumferential direction and the cover 22 and the disc 23 define a sub-impeller outlet 205.

[0163] The cover body 12 comprises a cover main body 121, a first bending portion 122 and a second bending portion 123, the outer periphery of the air outlet 15 is bent towards the inside of the air outlet 15 to form the first bending portion 122, the end of the first bending portion 122 away from the cover main body 121 is bent towards the direction close to the primary impeller 20a to form the second bending portion 123, and the first bending portion 122, the second bending portion 123 and the cover main body 121 define an annular groove 18, and the outer periphery of the impeller outlet 202 of the primary impeller 20a is located in the annular groove 18.

[0164] The first flow guide 3 is formed with a limiting groove 312 on the end face towards the primary impeller 20a, and the bearing seat 9 is installed in the limiting groove 312. The bearing seat 9 comprises a main body 91, an outer ring 94, connecting portions 95 and a support 96, the main body 91 is formed with a bearing mounting groove 92 extending in the axial direction of the housing 1, the bottom wall of the bearing mounting groove 92 is formed with 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 side of the main body 91, the side wall opposite to the main body 91 is connected by the connecting portions 95, the connecting portions 95 are provided in plurality, and the plurality of connecting portions 95 are arranged in the outer periphery wall of the main body 91 in the interval. The support 96 is provided on the lower end face of the outer ring 94 and extends away from the primary impeller 20a.

[0165] Further, the connecting portion 95 comprises a first connecting sub-portion 951 and a second connecting sub-portion 952 arranged in a stacked manner, the first connecting sub-portion 951 is located on the upper side of the second connecting sub-portion 952, and the width of the first connecting sub-portion 951 is greater than the width of the second connecting sub-portion 952 in the circumferential direction of the main body portion 91. The limiting groove 312 comprises a first limiting groove 313, a second limiting groove 314, a third limiting groove 315, and a support hole 311. Specifically, the first limiting groove 313 extends along the axial direction of the shell 1, the bottom wall of the first limiting groove 313 forms the first flow guide member through hole 310, the main body portion 91 is located in the first limiting groove 313, the second limiting groove 314 is annular, and the outer ring portion 94 is located in the second limiting groove 314, the third limiting groove 315 is in communication with the first limiting groove 313 and the second limiting groove 314 at both ends, and the connecting portion 95 is located in the third limiting groove 315. The third limiting groove 315 comprises 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 away from the primary impeller 20a, the width of the first limiting sub-groove 316 is greater than the width of the second limiting sub-groove 317 in the circumferential direction of the first limiting groove 313, the second connecting sub-portion 952 is located in the second limiting sub-groove 317, and the first connecting sub-portion 951 is located in the first limiting sub-groove 316. In addition, the support hole 311 is provided on the bottom wall of the second limiting groove 314 and extends away from the primary impeller 20a, and the support 96 is arranged in the support hole 311.

[0166] The first flow guide member 3 comprises a first flow guide member body 302, flow guide ribs 303, and limiting outer protrusions 309, one end of the flow guide rib 303 away from the first flow guide member body 302 abuts against the inner wall of the accommodating cavity 13, the cross-sectional area of the first flow guide member body 302 decreases in the direction away from the primary impeller 20a, and the flow guide rib 303 is provided with a plurality of flow guide ribs 303, the plurality of flow guide ribs 303 are arranged in a circumferential direction on the outer peripheral wall of the first flow guide member body 302, and the deflection angle of the flow guide rib 303 gradually decreases with respect to the axial direction of the fan assembly 100 in the direction toward the secondary impeller 20b.

[0167] The flow guide rib 303 comprises 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 the two ends of the connecting section 308 are connected to one end of the first extension section 306 and the second extension section 307, respectively, the other end of the first extension section 306 extends toward the primary impeller 20a, the other end of the second extension section 307 extends toward the secondary impeller 20b, and the thickness of the first extension section 306 and the second extension section 307 gradually decreases in the direction away from the connecting section 308, that is, the thickness of the upper end and the lower end of the flow guide rib 303 is less than the thickness of the middle position.

[0168] The limiting outer protrusion 309 extends in the axial direction of the fan assembly 100, and at least part of the limiting outer protrusion 309 is arranged on the guide vane 303, part of the support hole 311 is arranged in the limiting outer protrusion 309, the inner wall of the shell body 11 is formed with a limiting groove 16 matched with the limiting outer protrusion 309, and the limiting outer protrusion 309 is arranged in the limiting groove 16.

[0169] The second impeller 20b is arranged on the side of the first guide vane 3 away from the first impeller 20a, and the inner wall of the accommodating cavity 13 is smoothly connected with the inner peripheral wall of the impeller inlet 201 of the second impeller 20b. The sealing element 8 includes a first sealing element 81 and a second sealing element 82, the first sealing element 81 is arranged in the annular groove 18, and the second sealing element 82 is arranged between the outer peripheral wall of the impeller inlet 201 of the second impeller 20b and the inner wall of the accommodating cavity 13.

[0170] The driving element 7 is arranged on the side of the second impeller 20b away from the first guide vane 3, the output shaft 71 of the driving element 7 sequentially penetrates the second impeller 20b, the first guide vane 3, the bearing seat 9 and the first bearing 10, and is matched with the first impeller 20a, the output shaft 71 of the driving element 7 is fixedly connected with the first impeller 20a and the second impeller 20, and the output shaft 71 of the driving element 7 can rotate in the first guide vane through hole 310 and the bearing seat through hole 93.

[0171] Embodiment two

[0172] The embodiment is basically the same as the structure of the first embodiment, wherein the same parts are marked with the same reference numerals, and the reference Figure 3 Figure 14 The difference between the embodiment two and the first embodiment is that, in the axial direction of the fan assembly 100, the first impeller 20a and the second impeller 20b are arranged on the two sides of the driving interval, the end of the shell body 11 away from the cover 12 is formed with an air outlet 15, the second impeller 20b is arranged in the air outlet 15, and the end of the shell body 11 away from the cover 12 is connected with a plurality of series-connected diffusers 6, so that the air flow discharged by the second impeller 20b can pass through the plurality of diffusers 6 and then be discharged from the fan assembly 100.

[0173] A vacuum cleaner according to an embodiment of the second aspect of the present application will be described below.

[0174] The vacuum cleaner according to the embodiment of the present application comprises the above-mentioned fan assembly 100. Since the fan assembly 100 has a small axial dimension and a high internal vacuum degree, the installation space of the vacuum cleaner can be reduced, the size of the vacuum cleaner can be reduced, the lightweight design of the vacuum cleaner can be realized, and the suction force is high, which is beneficial to improving the dust collection efficiency of the vacuum cleaner.

[0175] According to the dust collector of the embodiment of the present application, the fan assembly 100 for the dust collector is arranged, so that the wind power is improved, the suction force is improved, and the miniaturization and portability are facilitated.

[0176] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or can be integrated; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0177] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0178] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application 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 along the axial direction of the fan assembly; A first guide member is adapted to guide the airflow from the upstream impeller to the downstream impeller. The first guide member and the inner surface of the housing define a guide duct. The guide duct is arc-shaped and offset in the axial direction of the fan assembly in the direction from the upstream impeller to the downstream impeller. The first guide member includes a first guide member body and a plurality of guide ribs spaced apart along the outer peripheral wall of the first guide member body. One end of each guide rib away from the first guide member body abuts against the inner wall of the housing to define the guide duct between two adjacent guide ribs, the first guide member body, and the cavity wall of the housing's receiving cavity. The first guide member body is provided with a limiting protrusion. The cavity wall of the housing's receiving cavity forms a limiting groove that cooperates with the limiting protrusion. The limiting protrusion is located in the limiting groove, and at least a portion of the limiting protrusion is provided on the guide ribs. A driving component, which is used to drive the impeller to rotate.

2. The wind turbine assembly according to claim 1, characterized in that, The cross-sectional area of ​​the first guide member decreases in the direction from the impeller on the upstream side to the impeller on the downstream side.

3. The wind turbine assembly according to claim 1, characterized in that, The impeller has an impeller inlet extending axially along the fan assembly and an impeller outlet located on the outer peripheral wall of the impeller. The first guide member is adapted to guide the airflow from the upstream impeller outlet to flow at least axially along the fan assembly toward the downstream impeller inlet.

4. The wind turbine assembly according to claim 1, characterized in that, The guide rib extends in an arc shape, and the deflection angle of the guide rib relative to the axial direction of the fan assembly decreases in the direction from the impeller on the upstream side to the impeller on the downstream side.

5. The wind turbine assembly according to claim 4, characterized in that, The guide rib extends along the axial direction of the fan assembly from the end of the impeller away from the upstream side.

6. The wind turbine assembly according to claim 1, characterized in that, The guide ribs include: a first guide rib and a second guide rib, 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 spaced along the outer peripheral wall of the first guide body.

7. The wind turbine assembly according to claim 6, characterized in that, The first guide rib and the second guide rib extend in the same direction.

8. The wind turbine assembly according to claim 6, characterized in that, One end of the impeller adjacent to the upstream side of the first guide rib and one end of the impeller adjacent to the upstream side of the second guide rib are in the same plane.

9. The wind turbine assembly according to claim 6, characterized in that, The length f of the second guide rib and the length g of the first guide rib satisfy 0.3≤f / g≤0.

7.

10. The wind turbine assembly according to claim 1, characterized in that, The guide rib has a first extension section adjacent to the upstream side of the impeller, a second extension section adjacent to the downstream side of the impeller, and a connecting section connecting the first extension section and the second extension section. The thickness of the first extension section and the second extension section decreases in the direction away from the connecting section.

11. The wind turbine assembly according to claim 1, characterized in that, The limiting protrusions and rotation grooves are provided in multiple ways, and the multiple limiting protrusions are arranged at intervals along the outer peripheral wall of the first guide body.

12. A vacuum cleaner, characterized in that, include: The wind turbine assembly according to any one of claims 1-11.

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