Fan and cleaning apparatus

Abstract

The present application discloses a fan and a cleaning apparatus. The fan (1000) comprises a housing (100), a first impeller (200), a second impeller (300), a driving device and a backflow device (400). The housing (100) is provided with a first air inlet (111), a first air passing port (130), a first air outlet (122), a first cavity (112) and a second cavity (121); the first impeller (200) is rotatably arranged in the first cavity (112); the second impeller (300) is rotatably arranged in the second cavity (121); the driving device is drivingly connected to the first impeller (200) and the second impeller (300); the backflow device (400) is arranged in the first cavity (112) and located between the first impeller (200) and the second impeller (300); and the backflow device (400) is provided with an air guide channel (420) used for guiding airflow generated by the first impeller (200) to the second impeller (300).

Description

Fans and cleaning equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent applications with application number 202410150064.3 filed on February 2, 2024, entitled “Blower and cleaning equipment”, application number 202311795859.1 filed on December 25, 2023, entitled “Diffuser and electrical equipment”, and application number 202311801325.5 filed on December 26, 2023, entitled “Exhaust pipe assembly, volute and electrical equipment”. The entire contents of the above patent applications are incorporated into this application by reference. Technical Field

[0003] The present application relates to the technical field of fans, and in particular to a fan and cleaning equipment. Background Art

[0004] Cleaning equipment like sweeping robots and vacuum cleaners are equipped with a volute fan for air intake. For example, in vacuum cleaners, the volute fan generates suction to draw in dust, hair, and other debris. The strength of this suction influences the cleaning performance of the vacuum cleaner. Related technologies employ multiple impellers to achieve high vacuum levels and strong suction. However, these impellers often lack proper airflow design, leading to significant airflow losses and low efficiency.

[0005] Volute fans typically also include a diffuser. The impeller rotates to generate airflow, which is then diffused and discharged. Fans typically have a preset design flow rate, and the corresponding diffuser blade angle is set to correspond to the design flow rate to achieve high-efficiency fan operation at the design flow rate. However, diffusers can only achieve high efficiency under certain operating conditions. When operating conditions change, efficiency decreases due to mismatch with the incoming flow parameters.

[0006] Furthermore, volute fans typically include a volute. In related art, volute fans generally have a preset design flow rate, and the corresponding volute outlet cross-sectional area is set to correspond to the design flow rate to achieve high-efficiency operation of the volute fan at the design flow rate. However, the volute outlet can only meet high-efficiency operation under certain operating conditions. When the operating conditions change, the efficiency decreases due to the mismatch with the different parameters of the incoming flow.

[0007] Summary of the Invention

[0008] The present application aims to at least partially solve one of the technical problems existing in the prior art, and to this end, the present application proposes a blower and a cleaning device.

[0009] A wind turbine according to an embodiment of the first aspect of the present application includes:

[0010] The housing is provided with a first air inlet, a first cavity, a first air outlet, a second cavity and a first air outlet which are connected in sequence;

[0011] a first impeller rotatably disposed in the first cavity;

[0012] a second impeller rotatably disposed in the second cavity;

[0013] a driving device, drivingly connected to the first impeller and the second impeller;

[0014] A return flow device is provided in the first cavity and located between the first impeller and the second impeller. The return flow device is formed with an air induction channel, and the air induction channel is used to guide the airflow generated by the first impeller to the second impeller.

[0015] According to some embodiments of the present application, the returner includes an air guide seat and a plurality of guide blades, the plurality of guide blades being connected to the side of the air guide seat facing away from the first impeller, and being arranged at circumferential intervals along the rotation axis of the first impeller, and the air induced channel being formed between adjacent guide blades.

[0016] According to some embodiments of the present application, a side of the air guide seat facing away from the first impeller protrudes toward the first air outlet.

[0017] According to some embodiments of the present application, the plurality of guide vanes are connected to the bottom wall of the first cavity, and the bottom wall of the first cavity is inclined toward the first air outlet.

[0018] According to some embodiments of the present application, a side wall of the first cavity is provided with a guide arc surface, and the guide arc surface is recessed in a direction away from the first impeller and extends to the air inlet end of the air induced channel.

[0019] According to some embodiments of the present application, the first impeller includes a first ring plate and a plurality of first blades connected to the first ring plate, and the plurality of first blades are arranged at circumferential intervals along the rotation axis of the first impeller. On a projection plane perpendicular to the rotation axis of the first impeller, the projection of the first blades is located between the inner contour line and the outer contour line of the projection of the first ring plate.

[0020] According to some embodiments of the present application, the second impeller includes a second ring plate and a plurality of second blades connected to the second ring plate, the plurality of second blades are arranged at circumferential intervals along the rotation axis of the second impeller, and on a projection plane perpendicular to the rotation axis of the second impeller, the projection of the second blades protrudes from the inner contour line of the projection of the second ring plate.

[0021] According to some embodiments of the present application, the first impeller includes a plurality of first blades arranged at circumferential intervals along the rotation axis of the first impeller, and the second impeller includes a plurality of second blades arranged at circumferential intervals along the rotation axis of the second impeller, and the number of the second blades is greater than the number of the first blades.

[0022] According to some embodiments of the present application, along the axial direction of the first impeller, the maximum height of the first blade at one end facing the rotation axis of the first impeller is H1, and the maximum height of the second blade at one end facing the rotation axis of the second impeller is H2, satisfying: 0.6*H1≤H2≤0.9*H1.

[0023] According to some embodiments of the present application, along the axial direction of the first impeller, the minimum height of the first blade at one end away from the rotation axis of the first impeller is H3, and the minimum height of the second blade at one end away from the rotation axis of the second impeller is H4, satisfying: 0.8*H3≤H4<H3.

[0024] According to some embodiments of the present application, the first impeller includes a plurality of first blades arranged at circumferential intervals along the rotation axis of the first impeller, a second air outlet is formed between two adjacent first blades, and the second air outlet is located at one end away from the rotation axis of the first impeller; the second impeller includes a plurality of second blades arranged at circumferential intervals along the rotation axis of the second impeller, a third air outlet is formed between two adjacent second blades, and the third air outlet is located at one end away from the rotation axis of the second impeller, and an air outlet cross-sectional area of ​​the third air outlet is smaller than an air outlet cross-sectional area of ​​the second air outlet.

[0025] According to some embodiments of the present application, the first impeller includes a first ring plate and a plurality of first blades connected to the first ring plate, the plurality of first blades are arranged at circumferential intervals along the rotation axis of the first impeller, the first ring plate is provided with a first through hole for air intake, the second impeller includes a second ring plate and a plurality of second blades connected to the second ring plate, the plurality of second blades are arranged at circumferential intervals along the rotation axis of the second impeller, the second ring plate is provided with a second through hole for air intake, and the minimum inner diameter of the first through hole is larger than the minimum inner diameter of the second through hole.

[0026] According to some embodiments of the present application, a second air outlet connected to the first air outlet is provided on the side of the returner facing the first air outlet, the minimum inner diameter of the second air outlet is D1, the second impeller is provided with a second through hole for air intake, the minimum inner diameter of the second through hole is D2, satisfying: -2mm≤D1-D2≤2mm.

[0027] According to some embodiments of the present application, the housing includes an air inlet shell and an air outlet volute connected to each other, the air inlet shell forms the first cavity, and the air outlet volute forms the second cavity.

[0028] According to some embodiments of the present application, an air outlet channel is formed in the air outlet volute, and part of the bottom wall of the air outlet volute is recessed in a direction away from the second impeller to form a groove, and the groove is arranged around the second impeller and forms a partial structure of the air outlet channel.

[0029] According to some embodiments of the present application, along the air outlet direction of the air outlet channel, the air outlet cross-sectional area of ​​the air outlet channel gradually increases.

[0030] The cleaning device according to the second embodiment of the present application includes the fan described in the above embodiment.

[0031] The third aspect of the present application further proposes a diffuser.

[0032] The diffuser proposed in accordance with the third embodiment of the present application includes: a main body, the main body including a circumferential side wall; a plurality of blades movably arranged on the circumferential side wall; and an adjustment assembly connected to the blades for adjusting the position of the blades.

[0033] In some embodiments, the peripheral side wall includes a plurality of mounting holes and a plurality of first slides, and the blade includes: a first connecting portion, which is rotatably inserted into the mounting hole; a second connecting portion, which is slidably provided on the first slide, and the adjusting component is connected to the second connecting portion, and the adjusting component can drive the blade to rotate through the second connecting portion.

[0034] In some embodiments, the adjustment assembly includes an adjustment member, and the second connection portion of each blade is connected to the adjustment member.

[0035] In some embodiments, the adjusting member includes a plurality of second slideways, the second connecting portion is slidably inserted into the second slideways, and the first slideway and the second slideway have different extending directions.

[0036] In some embodiments, the adjusting member is annular in structure, and a plurality of second slideways are distributed around the adjusting member.

[0037] In some embodiments, optionally, the adjustment assembly further includes: a rack connected to the adjustment member, and the rack is used to drive the adjustment member to move.

[0038] In some embodiments, optionally, the peripheral side wall includes a third slideway, and the rack is embedded in the third slideway.

[0039] In some embodiments, optionally, the blade includes a flexible portion, the flexible portion being in contact with the main body.

[0040] In some embodiments, optionally, the peripheral side wall is an annular structure, and the adjustment component is located on the inner side of the peripheral side wall.

[0041] According to a fourth aspect of the present application, the present application proposes an electrical device, comprising the diffuser proposed in the embodiment of the third aspect.

[0042] According to the fifth aspect of the present application, the exhaust pipe assembly proposed in the embodiment includes: a pipe body, the pipe body includes a plurality of assemblies, the plurality of assemblies are distributed in a ring shape, and the plurality of assemblies can move relative to each other; an adjustment component, movably arranged on the pipe body, and the adjustment component is used to adjust the opening area of ​​the first end of the pipe body.

[0043] In some embodiments, the adjustment assembly includes: an adjustment member, which is movably disposed on the tube body, and the adjustment member can move along the axial direction of the tube body. When the adjustment member is in a first position, the opening area of ​​the first end of the tube body is a first area. When the adjustment member is in a second position, the opening area of ​​the first end of the tube body is a second area. The first position is farther away from the first end of the tube body relative to the second position, and the first area is larger than the second area.

[0044] In some embodiments, the adjusting member is an annular structure and is sleeved on the outside of the tube body.

[0045] In some embodiments, the adjustment assembly further includes: a rack connected to the adjustment member, and the rack is used to drive the adjustment member to move.

[0046] In some embodiments, the assembling piece includes: a main body; a raised portion provided on the main body; and a restoring piece provided on the main body, wherein the restoring piece and the raised portion of the adjacent assembling piece abut against each other.

[0047] In some embodiments, along the circumference of the tube body, the length of the first end of the main body is greater than the length of the second end of the main body.

[0048] In some embodiments, the main body includes a guide surface, the reset member is disposed on one side of the main body, and the guide surface is located on a side of the protrusion facing away from the reset member.

[0049] In some embodiments, the second end of the assembly piece includes a first connecting portion, and the first connecting portion is used to be movably connected to the volute body.

[0050] In some embodiments, the first connection is a ball joint connection.

[0051] The volute proposed in accordance with the sixth embodiment of the present application includes: a volute body; an exhaust pipe assembly as proposed in the first embodiment, the exhaust pipe assembly is arranged on the volute body, and the first end of the exhaust pipe assembly is away from the volute body.

[0052] The electrical equipment proposed according to the seventh embodiment of the present application includes: the exhaust pipe assembly proposed in the first embodiment; or the volute proposed in the sixth embodiment.

[0053] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0055] FIG1 is a schematic structural diagram of a fan according to an embodiment of the present application;

[0056] FIG2 is a schematic structural diagram of a fan according to an embodiment of the present application from another perspective;

[0057] FIG3 is an exploded schematic diagram of a fan according to an embodiment of the present application;

[0058] FIG4 is a cross-sectional view of a fan according to an embodiment of the present application;

[0059] FIG5 is a cross-sectional view of an air inlet housing and a return flow device according to an embodiment of the present application;

[0060] FIG6 is a top view of a first impeller according to an embodiment of the present application;

[0061] FIG7 is a schematic structural diagram of a second impeller according to an embodiment of the present application;

[0062] FIG8 is a top view of a second impeller according to an embodiment of the present application;

[0063] FIG9 is a cross-sectional view of a first impeller according to an embodiment of the present application;

[0064] FIG10 is a cross-sectional view of a second impeller according to an embodiment of the present application;

[0065] FIG11 is an exploded view of an air outlet volute according to an embodiment of the present application;

[0066] FIG12 is a side view of a fan according to an embodiment of the present application;

[0067] FIG13 is a cross-sectional view of FIG12 taken at AA;

[0068] FIG14 shows a schematic structural diagram of a diffuser provided by an embodiment of the present application;

[0069] FIG15 shows a schematic structural diagram of a diffuser provided by an embodiment of the present application;

[0070] FIG16 shows a schematic structural diagram of a diffuser provided by an embodiment of the present application;

[0071] FIG17 shows a schematic structural diagram of a main body of a diffuser provided in one embodiment of the present application;

[0072] FIG18 shows a schematic structural diagram of an adjustment assembly in a diffuser provided by one embodiment of the present application;

[0073] FIG19 is a schematic structural diagram of a blade in a diffuser provided by one embodiment of the present application;

[0074] FIG20 shows a schematic structural diagram of a blade in a diffuser provided by one embodiment of the present application;

[0075] FIG21 is a schematic diagram showing the structure of the adjustment assembly and the gear in the diffuser provided by one embodiment of the present application;

[0076] FIG22 shows a partial schematic diagram of a diffuser provided by one embodiment of the present application;

[0077] FIG23 shows a schematic structural diagram of an exhaust pipe assembly provided in one embodiment of the present application;

[0078] FIG24 shows a schematic structural diagram of a tube body provided in one embodiment of the present application;

[0079] FIG25 shows a schematic structural diagram of an exhaust pipe assembly provided in one embodiment of the present application;

[0080] FIG26 shows a schematic structural diagram of two assembling parts and an adjustment assembly in an exhaust pipe assembly provided in one embodiment of the present application;

[0081] FIG27 shows a schematic structural diagram of assembled parts in an exhaust pipe assembly provided in one embodiment of the present application;

[0082] FIG28 shows a schematic structural diagram of a volute provided in one embodiment of the present application; and

[0083] FIG29 shows a schematic structural diagram of a volute provided in one embodiment of the present application.

[0084] Reference numerals:

[0085] Fan 1000;

[0086] Housing 100; air inlet housing 110; first air inlet 111; first cavity 112; guide arc surface 113; air outlet volute 120; second cavity 121; first air outlet 122; air outlet channel 123; mounting base 124; upper shell 125; lower shell 126; groove 127; first air outlet 130;

[0087] First impeller 200; first ring plate 210; first through hole 211; first blade 220; first channel 221; first bottom plate 230; second air inlet 240; second air outlet 250; first mounting portion 260;

[0088] Second impeller 300; second ring plate 310; second through hole 311; second blade 320; second channel 321; second bottom plate 330; third air inlet 340; third air outlet 350; second mounting portion 360;

[0089] Returner 400; guide vane 410; air induction channel 420; second air outlet 430; air guide seat 440;

[0090] Rotating shaft 500;

[0091] Diffuser 600 , body 610 , peripheral sidewall 612 , mounting hole 614 , first slide 616 , third slide 618 , blade 620 , first connecting portion 622 , second connecting portion 624 , flexible portion 626 , adjustment assembly 630 , adjustment member 632 , second slide 634 , rack 636 , guide member 638 , gear 640 ;

[0092] Exhaust pipe assembly 700 , pipe body 710 , assembly part 712 , main body 714 , protrusion 716 , reset part 718 , guide surface 720 , first connecting part 722 , adjustment assembly 730 , adjustment part 732 , rack 734 , volute 800 , 210 volute main body 810 . DETAILED DESCRIPTION

[0093] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0094] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0095] In the description of this application, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The terms "first" and "second" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the technical features indicated.

[0096] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0097] 1 and 2 , a blower 1000 according to an embodiment of the present application can be used in cleaning equipment such as vacuum cleaners and robot vacuums. The blower 1000 includes a housing 100, a first impeller 200, a first air inlet 111, and a first air outlet 122. Both the first air inlet 111 and the first air outlet 122 are disposed on the housing 100, and the first impeller 200 is disposed within the housing 100. By driving the first impeller 200 to rotate, airflow is directed from the first air inlet 111 into the interior of the housing 100 and finally out through the first air outlet 122.

[0098] To enable the blower 1000 to achieve a higher vacuum and greater suction force while ensuring no significant increase in noise, as shown in Figures 3 and 4 , in the embodiment of the present application, the blower 1000 further includes a second impeller 300, a drive device, and a recirculator 400. The drive device is not shown in the figures. The housing 100 also includes a first cavity 112, a second cavity 121, and a first air vent 130. The first air vent 130 is located between the first cavity 112 and the second cavity 121. The first impeller 200 is disposed within the first cavity 112, and the second impeller 300 is disposed within the second cavity 121. The drive device is driven and connected to the first impeller 200 and the second impeller 300 via a rotating shaft 500. The first air inlet 111, the first cavity 112, the first air vent 130, the second cavity 121, and the first air outlet 122 are sequentially connected.

[0099] 5 , the reflow device 400 is disposed within the first cavity 112 and between the first impeller 200 and the second impeller 300. The reflow device 400 is provided with an air induction channel 420, which is used to guide the airflow generated by the first impeller 200 to the second impeller 300. When the driving device drives the first impeller 200 and the second impeller 300 to rotate in the same direction, the airflow enters from the first air inlet 111, then passes through the first cavity 112, the air induction channel 420, the first air outlet 130, and the second cavity 121 in sequence, and finally blows out from the first air outlet 122.

[0100] Since the first impeller 200 and the second impeller 300 are used to jointly inhale air, the airflow completes the first stage of compression when passing through the first impeller 200, and completes the second stage of compression after passing through the second impeller 300. Therefore, after the airflow undergoes two-stage compression, the fan 1000 will obtain a higher vacuum degree and greater suction force. The first impeller 200 and the second impeller 300 do not need to use a higher rotational speed, which can ensure that the noise will not increase significantly, and mechanical losses can be reduced at low rotational speeds. At the same time, since the first impeller 200 discharges air in its radial direction, it is easy for the airflow to directly hit the side wall of the first cavity 112, causing airflow turbulence and large airflow losses. Therefore, by setting an air duct 420 to guide the airflow toward the second impeller 300, aerodynamic losses are reduced, thereby improving the working efficiency of the fan 1000.

[0101] 5 and 13 , in an embodiment of the present application, the returner 400 includes an air guide base 440 and a plurality of guide vanes 410 . The plurality of guide vanes 410 are connected to a side of the air guide base 440 facing away from the first impeller 200 . The plurality of guide vanes 410 are spaced apart circumferentially about the rotation axis of the first impeller 200 . Air induction channels 420 are formed between adjacent guide vanes 410 , i.e., a plurality of air induction channels 420 are provided. The plurality of air induction channels 420 are also spaced apart circumferentially about the rotation axis of the first impeller 200 , thereby guiding the airflow in multiple directions, thereby improving the uniformity of the air output.

[0102] As shown in Figure 4, in an embodiment of the present application, the air guide seat 440 protrudes toward the first air outlet 130 on the side away from the first impeller 200, which is conducive to guiding the air flow coming out of the air duct 420 to flow toward the first air outlet 130, making the air flow direction smoother, effectively reducing the air flow loss caused by air flow turbulence, and improving the working efficiency of the fan 1000.

[0103] Continuing with FIG4 , in an embodiment of the present application, a plurality of guide vanes are connected to the bottom wall of the first cavity, and the bottom wall of the first cavity is tilted toward the first air outlet. Therefore, the upper end of the air induction channel 420 extends toward the first impeller 200, and the lower end of the air induction channel 420 extends toward the first air outlet 130. In other words, along the air inlet direction of the air induction channel 420, the angle between the air induction channel 420 and the axis of the rotating shaft 500 gradually decreases, which is beneficial for guiding the airflow through the first air outlet 130 and then into the second through hole 311 of the second impeller 300, further reducing airflow losses and improving the efficiency of the fan 1000.

[0104] As shown in Figure 13 , in the embodiment of the present application, the air induction channel 420 is arc-shaped, and the multiple air induction channels 420 are distributed in a vortex-like manner. Since the airflow generated by the first impeller 200 rotates along the sidewalls of the first cavity 112, the arc-shaped and vortex-like distribution of the air induction channels can better guide the direction of the airflow, deflecting the airflow and directing it toward the second impeller 300 at a predetermined angle, effectively avoiding the problem of airflow turbulence caused by the inconsistency between the airflow direction and the direction of the third air inlet 340.

[0105] As shown in Figures 4 and 5 , in the embodiment of the present application, a second air outlet 430 is provided on the side of the return flow mechanism 400 facing the first air outlet 130, communicating with the first air outlet 130. The minimum inner diameter of the second air outlet 430 is D1, and the minimum inner diameter of the second through hole 311 of the second impeller 300 is D2, satisfying the following relationship: -2 mm ≤ D1 - D2 ≤ 2 mm. For example, D1 and D2 can be equal. When D1 - D2 is less than -2 mm, the cross-sectional area of ​​the second air outlet 430 is too small, resulting in low air outlet efficiency. When D1 - D2 is greater than 2 mm, the cross-sectional area of ​​the second air outlet 430 is too large, causing some airflow to impact the inner wall of the housing 100, resulting in airflow turbulence. Therefore, by designing the relationship -2 mm ≤ D1 - D2 ≤ 2 mm, the majority of the airflow guided by the return flow mechanism 400 smoothly enters the second impeller 300, improving air intake efficiency and effectively reducing airflow turbulence.

[0106] As shown in Figure 4 , in the embodiment of the present application, the sidewalls of the first cavity 112 are provided with a curved guide surface 113. The curved guide surface 113 is recessed away from the first impeller 200 and extends to the air inlet end of the air induction channel 420. Because the first impeller 200 is a centrifugal impeller that ejects air radially, the curved guide surface 113 is provided on the sidewalls of the first cavity 112 to guide the airflow into the air induction channel 420, effectively reducing airflow losses and improving the operating efficiency of the fan 1000.

[0107] As shown in Figure 3, in the embodiment of the present application, the first impeller 200 includes a first ring plate 210, first blades 220, and a first base plate 230. The first ring plate 210 and the first base plate 230 are spaced apart along the axial direction of the first impeller 200. A plurality of first blades 220 are provided and connected between the first ring plate 210 and the first base plate 230. The plurality of first blades 220 are spaced apart around the rotation axis of the first impeller 200. The first ring plate 210 is provided with first through-holes 211 for air intake, and first channels 221 are formed between adjacent first blades 220 for air discharge. The first impeller 200 is a centrifugal impeller, meaning that the first impeller 200 can intake air axially and discharge air radially. When the first impeller 200 rotates, airflow enters through the first through-holes 211, is blown out through the first channels 221 to the sidewalls of the first cavity 112, and then, guided by the air induction channel 420 of the recirculator 400, is blown toward the second impeller 300. Compared with the axial flow impeller solution, the centrifugal impeller can generate higher wind pressure and has higher efficiency, which can improve the suction effect.

[0108] Referring to Figure 6 , in the embodiment of the present application, the dashed line in Figure 6 represents the outline of the first blade 220 obscured by the first ring plate 210. On a projection plane perpendicular to the rotation axis of the first impeller 200, the projected outline of the first blade 220 lies between the inner and outer projected outlines of the first ring plate 210. Because the first blade 220 is not blocking the first through-hole 211, the air intake area of ​​the first impeller 200 is increased, improving air intake efficiency and enhancing manufacturability with reduced production difficulty.

[0109] As shown in Figure 7, in the embodiment of the present application, the second impeller 300 includes a second ring plate 310, second blades 320, and a second base plate 330. The second ring plate 310 and the second base plate 330 are spaced apart along the axial direction of the second impeller 300. A plurality of second blades 320 are provided and connected between the second ring plate 310 and the second base plate 330. The plurality of second blades 320 are spaced apart around the rotation axis of the second impeller 300. The second ring plate 310 is provided with second through holes 311 for air intake, and second channels 321 are formed between adjacent second blades 320. The second impeller 300 is a centrifugal impeller, meaning that the second impeller 300 can take in air axially and discharge air radially. When the second impeller 300 rotates, airflow enters through the second through holes 311, is blown out through the second channels 321 to the sidewalls of the second cavity 121, and finally is blown out through the first air outlet 122.

[0110] 7 and 8 , in an embodiment of the present application, on a projection plane perpendicular to the rotation axis of the second impeller 300, the projection contour line of the second blade 320 protrudes from the inner contour line of the projection of the second ring plate 310 on the side facing the rotation axis of the second impeller 300. The purpose is to increase the contact area between the blade and the airflow and improve the ability to do work on the airflow. At the same time, the cross-sectional area of ​​the second channel 321 can be reduced to increase the flow rate of the airflow and increase the suction force. When the fan 1000 is used inside a vacuum cleaner, it can effectively increase the negative pressure effect inside the vacuum cleaner, thereby improving the suction force and dust collection efficiency of the vacuum cleaner. It should be noted that in subsequent embodiments, unless otherwise specified, the fan 1000 is used in a vacuum cleaner as an example for explanation.

[0111] Therefore, the difference between the structures of the first impeller 200 and the second impeller 300 stems from their different functions. The purpose of the first impeller 200 is to achieve a greater air intake and facilitate manufacturing. However, after the airflow passes through the first impeller 200 and is pressurized and accelerated, the second impeller 300 needs to perform further work on the airflow to further increase its velocity. Therefore, the second impeller 300 can be designed so that the end of the second blade 320 facing the rotation axis of the second impeller 300 protrudes from the second through hole 311, thereby increasing the contact area with the airflow, improving the ability to perform work on the airflow, and further increasing the airflow velocity.

[0112] As shown in Figures 6 and 8, in the embodiment of the present application, the number of first blades 220 is less than the number of second blades 320. For example, the number of first blades 220 is 9, and the number of second blades 320 is 13. Of course, the number of first blades 220 and second blades 320 can also be other numbers, for example, the number of first blades 220 is 7, and the number of second blades 320 is 11. The appropriate number is selected based on actual circumstances. It is understood that because the number of second blades 320 is greater than the number of first blades 220, when the maximum outer diameter of the first impeller 200 and the maximum outer diameter of the second impeller 300 are the same, the cross-sectional area of ​​the first channel 221 is greater than the cross-sectional area of ​​the second channel 321. It should be noted that the cross-sectional area refers to the cross-sectional area of ​​the first channel 221 and the second channel 321 produced when a cross-sectional plane parallel to the rotation axis of the first impeller 200 cuts through the first channel 221 and the second channel 321 when the first impeller 200 and the second impeller 300 are coaxially arranged. Since the cross-sectional area of ​​the second channel 321 is small, the gas flow rate is faster than that of the first channel 221, and more second blades 320 can further increase the contact area with the airflow, improve the efficiency of working on the airflow, effectively increase the negative pressure effect inside the vacuum cleaner, and thus improve the suction force of the vacuum cleaner.

[0113] 9 and 10 , in the embodiment of the present application, along the axial direction of the first impeller 200, the maximum height of the first blade 220 at one end facing the rotation axis of the first impeller 200 is H1, and the maximum height of the second blade 320 at one end facing the rotation axis of the second blade 320 is H2, satisfying: 0.6*H1≤H2≤0.9*H1, which is equivalent to 0.6≤H2 / H1≤0.9, for example, H2 / H1=0.7, H2 / H1=0.75, or H2 / H1=0.8. It should be noted that the maximum height of the first blade 220 refers to the height between the end of the first blade 220 facing the rotation axis of the first impeller 200 and connected to the highest point of the first ring plate 210 and the first bottom plate 230; the maximum height of the second blade 320 refers to the height between the end of the second blade 320 facing the rotation axis of the second impeller 300 and connected to the highest point of the second ring plate 310 and the second bottom plate 330.

[0114] Among them, the end of the first channel 221 facing the rotation axis of the first impeller 200 is the second air inlet 240, and the end of the second channel 321 facing the rotation axis of the second impeller 300 is the third air inlet 340. Height affects the size of the air inlet area. When H2 / H1 is less than 0.6, the height of the second blade 320 is too low, and the air inlet area of ​​the third air inlet 340 is too small, which can easily lead to air inlet blockage, reduced efficiency, and increased noise and vibration. When H2 / H1 is greater than 0.9, although the air inlet efficiency can be improved, it is difficult to increase the wind speed. Therefore, by rationally designing the relationship between H1 and H2, the air inlet area of ​​the third air inlet 340 is smaller than the air inlet area of ​​the second air inlet 240, which can ensure a certain air inlet efficiency while also increasing the wind speed.

[0115] Continuing with FIG9 , in the embodiment of the present application, along the axial direction of the first impeller 200, the minimum height of the end of the first blade 220 away from the rotation axis of the first impeller 200 is H3, and the minimum height of the end of the second blade 320 away from the rotation axis of the second impeller 300 is H4, satisfying: 0.8*H3≤H4<H3, which is equivalent to 0.8≤H4 / H3<1, for example, H4 / H3=0.85, H4 / H3=0.9, or H4 / H3=0.95. It should be noted that the minimum height of the first blade 220 refers to the height between the end of the first blade 220 away from the rotation axis of the first impeller 200 and connected to the lowest point of the first ring plate 210 and the first bottom plate 230; the minimum height of the second blade 320 refers to the height between the end of the second blade 320 away from the rotation axis of the second impeller 300 and connected to the lowest point of the second ring plate 310 and the second bottom plate 330.

[0116] The end of the first channel 221 facing away from the rotation axis of the first impeller 200 is the second air outlet 250, and the end of the second channel 321 facing away from the rotation axis of the second impeller 300 is the third air outlet 350. When H4 / H3 is less than 0.8, the cross-sectional area of ​​the third air outlet 350 is too small, which can easily lead to reduced air outlet efficiency and increased noise and vibration. When H4 / H3 is greater than or equal to 1, it is difficult to achieve the effect of increasing wind speed. Therefore, by rationally designing the relationship between H3 and H4, so that the cross-sectional area of ​​the third air outlet 350 is smaller than the cross-sectional area of ​​the second air outlet 250, it is possible to ensure air outlet efficiency while also increasing air outlet speed.

[0117] 6 and 8 , in the embodiment of the present application, the minimum inner diameter of the first through hole 211 is greater than the minimum inner diameter of the second through hole 311. It is understood that the minimum inner diameters of the first through hole 211 and the second through hole 311 reflect the size of the air inlet area, i.e., the air inlet area of ​​the first through hole 211 is greater than the air inlet area of ​​the second through hole 311. Since the first impeller 200 primarily ensures a large air intake volume and the second impeller 300 primarily serves to increase airflow velocity, by designing D1 to be greater than D2, the first impeller 200 can ensure a large air intake volume, while the second impeller 300 can increase airflow velocity by reducing the air intake area.

[0118] 3 and 4 , in the embodiment of the present application, the housing 100 includes an air inlet housing 110 and an air outlet volute 120. The air inlet housing 110 and the air outlet volute 120 are connected. The air inlet housing 110 is provided with a first cavity 112 and a first air inlet 111, and the air outlet volute 120 is provided with a second cavity 121 and a first air outlet 122. The use of the air outlet volute 120 can adapt to the air outlet direction of the second impeller 300, thereby improving the efficiency and performance of the fan 1000.

[0119] 11 and 12 , in an embodiment of the present application, the air outlet volute 120 includes an upper shell portion 125 and a lower shell portion 126. The upper shell portion 125 and the lower shell portion 126 are connected, and a second cavity 121 is defined between the upper shell portion 125 and the lower shell portion 126. The air outlet volute 120 is formed with an air outlet channel 123. A portion of the bottom wall of the lower shell portion 126 is concavely formed with a groove 127 in a direction away from the second impeller 300. The groove 127 is arranged around the second impeller 300 and forms a part of the structure of the air outlet channel 123. Airflow can be blown out along the air outlet channel 123, for example, flowing in the direction of the dotted arrow in FIG. 11 .

[0120] It is understood that the cross-sectional area of ​​the outlet volute 120 during air discharge must meet certain requirements and cannot be too large or too small. A large area can cause turbulent airflow, while a small area can cause blockage and reduced efficiency. To ensure that the cross-sectional area of ​​the outlet duct 123 meets the requirements, the groove 127 protrudes radially from the second impeller 300 or away from the second impeller 300. If the groove 127 protrudes radially from the second impeller 300, the radial dimension of the fan 1000 increases, hindering the miniaturization of the fan 1000. If the groove 127 protrudes away from the second impeller 300, the bottom wall of the outlet volute 120 still needs to be equipped with a drive device, which itself occupies a certain position in the axial direction. Therefore, the solution of this embodiment does not increase the axial length of the fan 1000, which facilitates the miniaturization of the fan 1000 and reduces the space occupied by the fan 1000.

[0121] As shown in Figures 11 and 12 , in the embodiment of the present application, the cross-sectional area of ​​the air outlet channel 123 gradually increases along the outlet direction of the air outlet channel 123. This reduces the air outlet velocity and increases the air pressure in the air outlet channel 123. This increased air pressure further enhances the suction power of the vacuum cleaner, facilitates airflow through the vacuum cleaner's ducts and filtration system, and improves the cleaning effect.

[0122] In summary, the first impeller 200 mainly ensures that the fan 1000 can have a larger air intake volume; the return flow device 400 plays the role of guiding the direction of the airflow and reducing airflow loss; the second impeller 300 can further increase the speed of the airflow; the air outlet channel 123 can further increase the pressure of the airflow, so that the fan 1000 can obtain a higher vacuum degree and greater suction.

[0123] As shown in FIG2 , in an embodiment of the present application, the drive device includes a motor (not shown). A mounting base 124 is provided at the bottom of the air outlet volute 120. The motor is fixedly connected to the mounting base 124 and is drivingly connected to the rotating shaft 500. Therefore, the motor can drive the first impeller 200 and the second impeller 300 to rotate synchronously via the rotating shaft 500. In another embodiment of the present application, the drive device may further include two motors, which respectively drive the first impeller 200 and the second impeller 300 to rotate. The appropriate solution is selected based on the actual situation.

[0124] 9 and 10 , in the embodiment of the present application, the first base plate 230 is provided with a first mounting portion 260, and the second base plate 330 is provided with a second mounting portion 360. The first mounting portion 260 and the second mounting portion 360 are used to be fixedly connected to the rotating shaft 500. The first mounting portion 260 is cylindrical, so the overall strength of the first mounting portion 260 is relatively high, which can ensure the stability of the connection with the rotating shaft 500. The outer wall of the second mounting portion 360 is tapered. Since the second impeller 300 is located between the first impeller 200 and the motor and is connected to the middle of the rotating shaft 500, the strength requirement is lower than that of the first mounting portion 260. Therefore, the tapered design reduces airflow loss and improves the efficiency of the fan 1000.

[0125] The present application discloses a cleaning device in accordance with an embodiment of the present invention, and the cleaning device includes the fan 1000 of the above embodiment. The cleaning device may be a vacuum cleaner or a sweeping robot. The cleaning device in accordance with the present application adopts the fan 1000 of the above embodiment, and by setting the first impeller 200 and the second impeller 300 to rotate under the drive of the driving device, the airflow can be sucked into the first cavity 112 from the first air inlet 111 of the housing 100, and then pass through the air induction channel 420 of the return flow device 400, the first air outlet 130 and the second cavity 121 in sequence, and finally blown out from the first air outlet 122. Due to the adoption of the scheme of jointly inhaling air by the first impeller 200 and the second impeller 300, the airflow completes the first compression when passing through the first impeller 200, and completes the second compression after passing through the second impeller 300. Therefore, after the airflow undergoes two-stage compression, the fan 1000 will obtain a higher vacuum degree and a greater suction force. Moreover, the first impeller 200 and the second impeller 300 do not need to use a higher rotational speed, which can ensure that the noise will not increase significantly, and the mechanical loss can be reduced at a low rotational speed. At the same time, under the guidance of the air duct 420, the aerodynamic loss can be reduced, thereby improving the working efficiency of the fan 1000.

[0126] Since the cleaning device adopts all the technical solutions of the fan 1000 of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described in detail here.

[0127] The diffuser 600 and electrical equipment provided according to some embodiments of the present application are described below with reference to FIG. 14 to FIG. 22 .

[0128] As shown in Figures 14 to 16, some embodiments of the present application provide a diffuser 600, which includes a main body 610, blades 620 and an adjustment assembly 630. The main body 610 includes a circumferential side wall 612. The number of blades 620 is multiple, and the multiple blades 620 are movably set on the circumferential side wall 612. The adjustment assembly 630 and the multiple blades 620 are all connected, and the adjustment assembly 630 can adjust the position of the blades 620.

[0129] The diffuser 600 provided in an embodiment of the present application includes a main body 610, blades 620, and an adjustment assembly 630. The blades 620 are arranged on the peripheral side walls 612 of the main body 610, and the blades 620 are movable relative to the main body 610. The adjustment assembly 630 is connected to the blades 620. The adjustment assembly 630 can adjust the position of the blades 620, thereby adjusting the axial angle of the blades 620 relative to the main body 610. This allows the diffuser 600 to meet different airflow flow rates, that is, to achieve good efficiency under different operating conditions of the electrical equipment.

[0130] That is, the diffuser 600 provided in the present application changes the structure of the axial flow diffuser 600 by adjusting the angle of the blades 620, so that it can match airflows with different parameters and improve the performance of electrical equipment under different working conditions.

[0131] As shown in Figures 14, 19 and 20, in some embodiments, optionally, the blade 620 includes a first connection portion 622 and a second connection portion 624. The first connection portion 622 and the second connection portion 624 can be located on the same side of the blade 620. A plurality of mounting holes 614 and a plurality of first slides 616 are provided on the peripheral side wall 612. The number of mounting holes 614, the number of first slides 616 and the number of blades 620 are all the same. The first connection portion 622 of a blade 620 is inserted into a mounting hole 614, and the first connection portion 622 can rotate relative to the mounting hole 614. The second connection portion 624 of a blade 620 is inserted into a first slide 616, and the second connection portion 624 can slide relative to the first slide 616. Then, when the second connection portion 624 slides in the first sliding motion, the first connection portion 622 rotates in the mounting hole 614, thereby adjusting the inclination angle of the blade 620.

[0132] In this embodiment, the peripheral side wall 612 includes multiple mounting holes 614 and multiple first slideways 616 , wherein one mounting hole 614 and one first slideway 616 correspond to a group, and one blade 620 cooperates with one group of mounting holes 614 and first slideway 616 .

[0133] The blade 620 includes a first connection portion 622 and a second connection portion 624. The first connection portion 622 can be rotatably inserted into the mounting hole 614, and the second connection portion 624 can be slidably set in the first slide 616. The adjustment component 630 is connected to the second connection portion 624, and then the adjustment component 630 can adjust the position of the second connection portion 624 in the first slide 616. During the movement of the second connection portion 624 in the first slide 616, the blade 620 rotates with the first connection portion 622 as the axis, thereby adjusting the axial angle of the blade 620 relative to the main body 610, that is, the blade 620 moves in a rotational manner. This movement method is stable and reliable, which improves the reliability of the diffuser 600. The change in the angle of the blade 620 changes the air duct structure formed between adjacent blades 620, thereby changing the airflow flow matched by the diffuser 600.

[0134] The first connection portion 622 may be a columnar structure, and the second connection portion 624 may be a columnar structure.

[0135] Specifically, as shown in Figures 15 and 16, the adjustment component 630 can adjust the second connecting portion 624 of the blade 620 to move along the first slide 616 in direction A or direction B, thereby adjusting the angle of the blade 620 relative to the axial direction and adjusting the optimal airflow flow corresponding to the diffuser 600, thereby improving the applicability of the diffuser 600 and improving the efficiency of the electrical equipment.

[0136] The diffuser 600 provided in the present application includes a main body 610 and a plurality of blades 620, wherein the plurality of blades 620 are distributed on the main body 610 at intervals along the circumference. The diffuser 600 also includes an adjustment assembly 630 fixedly connected to each blade 620 in a one-to-one correspondence and configured to adjust the angle of the blade 620. Each blade 620 can be driven to rotate as the adjustment assembly 630 moves along the axial direction, thereby adjusting the installation angle of the blade 620.

[0137] By changing the installation angle of the blades 620, the flow channels between the blades 620 of the diffuser 600 can be coordinated with airflows of different parameters, thereby adapting to different working conditions of the electrical equipment, which is beneficial for the electrical equipment to achieve higher efficiency under different working conditions.

[0138] As shown in Figures 14, 18 and 21, in some embodiments, optionally, the adjustment assembly 630 includes an adjustment member 632, and the adjustment member 632 is connected to the second connection parts 624 of multiple blades 620, so that one adjustment member 632 can adjust all the blades 620 at the same time.

[0139] In this embodiment, the adjustment assembly 630 includes an adjustment member 632, and the second connection portion 624 of each blade 620 is connected to the adjustment member 632, that is, one adjustment member 632 can adjust all the blades 620 at the same time, ensuring the uniformity of the angles of multiple blades 620 and ensuring the diffusion effect of the diffuser 600.

[0140] As shown in FIG. 14 , the adjusting member 632 can move in the W direction or the V direction along the axial direction of the main body 610 , thereby driving the second connecting portion 624 to move in the A direction or the B direction along the first slideway 616 .

[0141] As shown in Figures 14, 18 and 21, in some embodiments, optionally, the adjusting member 632 includes a plurality of second slides 634, the second connecting portion 624 is slidably inserted into the second slides 634, and the first slide 616 and the second slide 634 extend in different directions.

[0142] In this embodiment, the adjusting member 632 includes a plurality of second slides 634, a second connecting portion 624 and a second slide 634 cooperate with each other, and the second slide 634 can be slidably inserted into the second slide 634. Since the blade 620 is rotating, the motion trajectory of the second connecting portion 624 is an arc. Therefore, setting the first slide 616 and the second slide 634 to have different extension directions can decompose the arc motion trajectory, avoid interference between the second connecting portion 624 and the second slide 634, and ensure the rotation effect of the blade 620.

[0143] Specifically, as shown in Figure 22, the extension direction N of the second slide 634 and the extension direction M of the first slide 616 form a certain angle, and then when the adjusting member 632 moves along the axial direction, the second connecting part 624 performs an inclined or arc-shaped movement along the first slide 616, thereby adjusting the angle of the blade 620 relative to the axial direction in a timely manner.

[0144] As shown in FIG. 14 and FIG. 18 , in some embodiments, optionally, the adjusting member 632 is an annular structure, and the plurality of second slideways 634 are distributed around the adjusting member 632 .

[0145] In this embodiment, the adjusting member 632 has an annular structure, which reduces the weight of the adjusting member 632 and the power required for the movement of the adjusting member 632. In addition, multiple second slides 634 are distributed on the circumferential side of the adjusting member 632 to ensure that the second slides 634 can correspond one-to-one with the second connecting portion 624 of the blade 620.

[0146] Specifically, the second slideways 634 are evenly arranged on the adjusting member 632 .

[0147] As shown in Figures 14, 18 and 21, in some embodiments, optionally, the adjustment assembly 630 also includes a rack 636 connected to the adjustment member 632, and the rack 636 is used to drive the adjustment member 632 to move, wherein the rack 636 protrudes from the adjustment member 632 on one side of the adjustment member 632.

[0148] In this embodiment, the adjustment assembly 630 also includes a rack 636 connected to the adjustment member 632. The rack 636 can drive the adjustment member 632 to move. The cooperation between the rack 636 and the gear 640 can achieve a locking effect to ensure that the blade 620 can stay in the required position. In addition, the movement accuracy of the rack 636 is high, which improves the reliability of the matching of the diffuser 600 and the airflow flow.

[0149] Specifically, as shown in FIG. 8 , the rack 636 may cooperate with the gear 640 , and when the gear 640 rotates, the adjusting member 632 may be driven to move via the rack 636 .

[0150] As shown in FIG. 14 and FIG. 17 , in some embodiments, optionally, the peripheral side wall 612 includes a third slideway 618 , and the rack 636 is embedded in the third slideway 618 .

[0151] In this embodiment, the peripheral side wall 612 includes a third slideway 618 , and the rack 636 is embedded in the third slideway 618 and can move in the third slideway 618 , thereby improving the stability of the movement of the rack 636 .

[0152] There may be multiple racks 636 , and the multiple racks 636 are embedded in the peripheral sidewall 612 in different directions, thereby improving the stability of the adjustment member 632 .

[0153] Alternatively, as shown in FIG. 16 and FIG. 18 , a guide member 638 is further provided on the adjusting member 632 , and the guide member 638 is embedded in the peripheral side wall 612 , thereby increasing the stability of the movement of the adjusting member 632 .

[0154] As shown in FIG. 20 , in some embodiments, optionally, the blade 620 includes a flexible portion 626 , and the flexible portion 626 is in contact with the body 610 .

[0155] In this embodiment, the blade 620 includes a flexible portion 626, which is in contact with the main body 610. Since the blade 620 is movable relative to the main body 610, the flexible portion 626 is provided on the blade 620, and the flexible portion 626 is in contact with the main body 610, so that after the angle of the blade 620 is changed, the blade 620 still fits tightly with the main body 610, thereby reducing the possibility of a gap between the main body 610 and the blade 620.

[0156] Specifically, the flexible portion 626 can be made of rubber, plastic or resin.

[0157] As shown in FIG. 14 , FIG. 15 and FIG. 17 , in some embodiments, optionally, the peripheral side wall 612 is an annular structure, and the adjustment assembly 630 is located on the inner side of the peripheral side wall 612 .

[0158] In this embodiment, the peripheral side wall 612 is an annular structure, and the regulating assembly 630 is disposed on the inner side of the peripheral side wall 612 , thereby reducing the influence of the regulating assembly 630 on the airflow.

[0159] Some embodiments of the present application further provide an electrical device, including the diffuser 600 described above.

[0160] The electrical device provided in the embodiment of the present application includes the diffuser 600 described above, and therefore has all the beneficial effects of the diffuser 600 described above, which will not be described one by one here.

[0161] The exhaust pipe assembly 700 , the volute 800 , and the electrical equipment provided according to some embodiments of the present application are described below with reference to FIG. 23 to FIG. 29 .

[0162] As shown in Figures 23, 24 and 25, some embodiments of the present application provide an exhaust pipe assembly 700, which includes a tube body 710 and an adjustment assembly 130. The tube body 710 is assembled from a plurality of assembling parts 712. The plurality of assembling parts 712 are arranged along the circumference of the tube body 710 to assemble into the tube body 710, and the plurality of assembling parts 712 can move relative to each other. The adjustment assembly 130 is arranged on the tube body 710, and the adjustment assembly 130 can adjust the opening area of ​​the first end of the tube body 710.

[0163] The exhaust pipe assembly 700 provided in the present application includes: a pipe body 710 and an adjustment assembly 130. The pipe body 710 includes a plurality of assemblies 712. The plurality of assemblies 712 are assembled into an annular structure, and the plurality of assemblies 712 can move relative to each other. The adjustment assembly 130 can be movably arranged on the pipe body 710. The movement of the adjustment assembly 130 can make the assemblies 712 move. The movement of the assemblies 712 can change the opening area of ​​the first end of the pipe body 710, thereby adapting to different air flow rates, so that the volute 800 or electrical equipment can have better efficiency under different working conditions, and improve the efficiency of the electrical equipment under different working conditions while ensuring the structural reliability of the electrical equipment.

[0164] As shown in Figures 23, 25 and 26, in some embodiments, optionally, the adjustment assembly 130 includes an adjustment member 732, which is movably provided on the tube body 710, and the adjustment member 732 can be moved along the axial direction of the tube body 710 to a first position and a second position. When the adjustment member 732 is in the first position, the opening area of ​​the first end of the tube body 710 is the first area. When the adjustment member 732 is in the second position, the opening area of ​​the first end of the tube body 710 is the second area. The first position is farther away from the first end of the tube body 710 relative to the second position, and the first area is greater than the second area.

[0165] In this embodiment, the adjustment assembly 130 includes an adjustment member 732, which is movably disposed on the tube body 710 and can move axially along the tube body 710. When the adjustment member 732 moves to a first position, the opening area of ​​the first end of the tube body 710 is a first area. When the adjustment member 732 moves to a second position, the opening area of ​​the first end of the tube body 710 is a second area.

[0166] The first position is farther away from the first end of the tube body 710 than the second position, and the first area is larger than the second area, so that the opening area of ​​the first end of the exhaust pipe assembly 700 can be adjusted by moving the adjusting member 732 .

[0167] The above first position may be any position to which the adjusting member 732 can be moved, and the second position may be any position to which the adjusting member 732 can be moved.

[0168] As shown in FIG. 23 and FIG. 26 , in some embodiments, optionally, the adjusting member 732 is an annular structure and is sleeved on the outside of the tube body 710 .

[0169] In this embodiment, the adjusting member 732 is annular and is sleeved on the outside of the tube body 710. The adjusting member 732 is clamped on the outside of the tube body 710, thereby improving the limiting effect of the adjusting member 732 on the movement of the assembly member 712 and improving the control accuracy of the opening area of ​​the first end of the tube body 710.

[0170] As shown in FIG25 , when the adjusting member 732 moves in a first direction along the axial direction of the tube body 710, the assembling member 712 is squeezed by the adjusting member 732 and rotates inwardly of the tube body 710, thereby reducing the opening area of ​​the first end of the tube body 710. When the adjusting member 732 moves in a second direction along the axial direction of the tube body 710, the assembling member 712 rotates outwardly of the tube body 710, thereby increasing the opening area of ​​the first end of the tube body 710.

[0171] That is, the adjusting member 732 and the outer edge of the assembling member 712 are matched.

[0172] As shown in FIG. 23 and FIG. 25 , in some embodiments, optionally, the adjustment assembly 130 further includes a rack 734 connected to the adjustment member 732 , and the rack 734 is used to drive the adjustment member 732 to move.

[0173] In this embodiment, the adjustment assembly 130 also includes a rack 734 connected to the adjustment member 732. The rack 734 can drive the adjustment member 732 to move. The cooperation between the rack 734 and the gear can achieve a locking effect to ensure that the opening area of ​​the first end of the tube body 710 can stay at the required situation. In addition, the movement accuracy of the rack 734 is high, which improves the reliability of the matching of the tube body 710 and the airflow flow.

[0174] As shown in Figures 23, 24, 26 and 27, in some embodiments, optionally, the assembly piece 712 includes a main body 714, a protrusion 716 and a reset piece 718, the protrusion 716 is arranged on the main body 714, the reset piece 718 is arranged on the main body 714, and the reset piece 718 and the protrusion 716 of the adjacent assembly piece 712 are offset against each other.

[0175] In this embodiment, the assembly piece 712 includes a main body 714, a protrusion 716 and a reset piece 718. The protrusion 716 and the reset piece 718 are arranged on the main body 714. The main bodies 714 of multiple assembly pieces 712 are matched and spliced ​​into a tube body 710. The main body 714 is provided with a protrusion 716 and a reset piece 718. The reset piece 718 of an assembly piece 712 and the protrusion 716 of the adjacent assembly piece 712 are abutted against each other, so that the adjacent assembly pieces 712 can move relative to each other.

[0176] Specifically, when the adjusting member 732 moves to the second position, the reset member 718 is squeezed by the main body 714 and the raised portion 716 of the other assembly member 712, and the opening area of ​​the first end of the tube body 710 is smaller. When the adjusting member 732 moves to the first position, the reset member 718 supports the main body 714 and the raised portion 716 of the other assembly member 712, thereby increasing the opening area of ​​the first end of the tube body 710. The automatic reset of the first end of the tube body 710 can be achieved by the setting of the reset member 718.

[0177] The main body 714 , the protruding portion 716 and the restoring member 718 may be an integrated structure.

[0178] As shown in FIG. 27 , in some embodiments, optionally, along the circumference of the tube body 710 , the length of the first end of the main body 714 is greater than the length of the second end of the main body 714 .

[0179] In this embodiment, along the circumference of the tube body 710, the length of the first end of the main body 714 is greater than the length of the second end of the main body 714, that is, the main body 714 is roughly wedge-shaped and the tube body 710 is trumpet-shaped, which increases the adjustment range of the opening area of ​​the first end of the tube body 710.

[0180] As shown in FIG25 , when the adjusting member 732 moves in a first direction along the axial direction of the tube body 710, the assembling member 712 is squeezed by the adjusting member 732 and rotates inwardly of the tube body 710, thereby reducing the opening area of ​​the first end of the tube body 710. When the adjusting member 732 moves in a second direction along the axial direction of the tube body 710, the assembling member 712 rotates outwardly of the tube body 710, thereby increasing the opening area of ​​the first end of the tube body 710.

[0181] As shown in Figures 23, 24, 26 and 27, in some embodiments, optionally, the main body 714 includes a guide surface 720, the reset member 718 is provided on one side of the main body 714, and the guide surface 720 is located on the side of the protrusion 716 away from the reset member 718.

[0182] In this embodiment, the main body 714 includes a guide surface 720, and the reset member 718 and the guide surface 720 are respectively arranged on opposite sides of the protrusion 716, so that the guide surfaces 720 of one assembly part 712 and the guide surfaces 720 of another assembly part 712 are offset against each other to ensure that during the adjustment of the opening area of ​​the first end of the tube body 710, adjacent assembly parts 712 can be offset against each other, thereby reducing the possibility of air leakage between the assembly parts 712.

[0183] As shown in FIG. 27 , in some embodiments, optionally, the second end of the assembly piece 712 includes a first connecting portion 722 , and the first connecting portion 722 is used to be movably connected to the volute body 810 .

[0184] In this embodiment, the second end of the assembly piece 712 includes a first connecting portion 722, and the first connecting portion 722 and the volute body 810 are movably connected. Therefore, when the tube body 710 adjusts the opening area of ​​the first end, the assembly piece moves relative to the volute body 810, thereby ensuring the reliability of the connection between the exhaust pipe assembly 700 and the volute body 810.

[0185] As shown in FIG. 27 , in some embodiments, the first connection portion 722 optionally includes a ball joint connection portion.

[0186] In this embodiment, the first connection portion 722 includes a ball joint connection portion, thereby increasing the degree of freedom of the assembly 712 and reducing the possibility of the assembly 712 being interfered with by the volute body 810 , making the assembly 712 move more smoothly.

[0187] As shown in Figures 26 and 29, the volute 800 proposed according to the embodiment of the present application includes a volute body 810 and the exhaust pipe assembly 700 proposed in the above embodiment. The exhaust pipe assembly 700 is arranged on the volute body 810, and the first end of the exhaust pipe assembly 700 is away from the volute body 810.

[0188] Specifically, a second connection portion is provided on the volute 800, and the first connection portion 722 cooperates with the second connection portion, wherein the second connection portion can be a groove, and the first connection portion 722 is embedded in the groove, thereby realizing a movable connection between the volute 800 and the exhaust pipe assembly 700.

[0189] The volute 800 provided in the embodiment of the present application includes the exhaust pipe assembly 700 as described above, and therefore has all the beneficial effects of the exhaust pipe assembly 700 as described above, which will not be described one by one here.

[0190] Some embodiments of the present application provide a volute 800, which includes a volute body 810 and an exhaust pipe assembly 700. The exhaust pipe assembly 700 includes a plurality of movable assemblies 712. The plurality of assemblies 712 are distributed on the volute body 810 at circumferential intervals at the outlet of the volute body 810. The outer edges of the adjustment assembly 130 and the assemblies 712 are in contact with each other. Each of the assemblies 712 can be staggered and matched with each other as the adjustment assembly 130 moves along the axial direction of the tube body 710, thereby adjusting the opening area of ​​the first end of the tube body 710.

[0191] By changing the opening area of ​​the first end of the tube body 710 of the exhaust pipe assembly 700, the volute 800 can be adapted to airflows of different parameters, thereby adapting to different working conditions of the electrical equipment, which is beneficial for the electrical equipment to achieve higher efficiency under different working conditions.

[0192] The electrical equipment provided in the embodiment of the present application includes the exhaust pipe assembly 700 or the volute 800 described above.

[0193] The electrical equipment provided in the embodiment of the present application includes the exhaust pipe assembly 700 or the volute 800 described above, and therefore has all the beneficial effects of the exhaust pipe assembly 700 or the volute 800 described above, which will not be listed one by one here.

[0194] Specifically, the electrical equipment includes blowers, hair dryers, air conditioners or fans, etc.

[0195] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. The fan includes: a housing provided with a first air inlet, a first cavity, a first air passage, a second cavity, and a first air outlet that are sequentially communicated; a first impeller rotatably disposed in the first cavity; a second impeller rotatably disposed in the second cavity; a driving device drivingly connected to the first impeller and the second impeller; and a return air device disposed in the first cavity and located between the first impeller and the second impeller. The return air device forms an air guiding channel for guiding the air flow generated by the first impeller to the second impeller.

2. The blower according to claim 1, wherein, The return air device includes a wind guiding seat and a plurality of guide vanes. The plurality of guide vanes are connected to a side of the wind guiding seat facing away from the first impeller and are circumferentially spaced along the rotation axis of the first impeller. The air guiding channel is formed between adjacent guide vanes.

3. The fan according to claim 2, wherein, A side of the wind guiding seat facing away from the first impeller protrudes toward the first air passage.

4. The blower according to claim 2 or 3, wherein, The plurality of guide vanes are connected to the bottom wall of the first cavity, and the bottom wall of the first cavity is inclined toward the first air passage.

5. The blower according to any one of claims 1 to 4, wherein, A guiding arc surface is provided on the side wall of the first cavity. The guiding arc surface is recessed along a direction away from the first impeller and extends to the air inlet end of the air guiding channel.

6. The blower according to any one of claims 1 to 5, wherein, The first impeller includes a first ring plate and a plurality of first blades connected to the first ring plate. The plurality of first blades are circumferentially spaced along the rotation axis of the first impeller. On a projection plane perpendicular to the rotation axis of the first impeller, the projection of the first blade is located between the inner contour line and the outer contour line of the projection of the first ring plate.

7. The blower according to any one of claims 1 to 6, wherein, The second impeller includes a second ring plate and a plurality of second blades connected to the second ring plate. The plurality of second blades are circumferentially spaced along the rotation axis of the second impeller. On a projection plane perpendicular to the rotation axis of the second impeller, the projection of the second blade protrudes from the inner contour line of the projection of the second ring plate.

8. The blower according to any one of claims 1 to 7, wherein, The first impeller includes a plurality of first blades circumferentially spaced along the rotation axis of the first impeller, and the second impeller includes a plurality of second blades circumferentially spaced along the rotation axis of the second impeller. The number of the second blades is greater than the number of the first blades.

9. The blower according to claim 8, wherein, Along the axial direction of the first impeller, the maximum height of one end of the first blade facing the rotation axis of the first impeller is H1, and the maximum height of one end of the second blade facing the rotation axis of the second impeller is H2, satisfying: 0.6*H1 ≤ H2 ≤ 0.9*H1.

10. The blower according to claim 8 or 9, wherein Along the axial direction of the first impeller, the lowest height of one end of the first blade facing away from the rotation axis of the first impeller is H3, and the lowest height of one end of the second blade facing away from the rotation axis of the second impeller is H4, satisfying: 0.8*H3 ≤ H4 < H3.

11. The blower according to any one of claims 1 to 10, wherein, The first impeller includes a plurality of first blades circumferentially spaced along the rotation axis of the first impeller. A second air outlet is formed between two adjacent first blades. The second air outlet is located at one end of the first blade away from the rotation axis of the first impeller. The second impeller includes a plurality of second blades circumferentially spaced along the rotation axis of the second impeller. A third air outlet is formed between two adjacent second blades. The third air outlet is located at one end of the second blade away from the rotation axis of the second impeller. The air outlet cross-sectional area of the third air outlet is smaller than that of the second air outlet.

12. The blower according to any one of claims 1 to 11, wherein, The first impeller includes a first ring plate and a plurality of first blades connected to the first ring plate. The plurality of first blades are circumferentially spaced along the rotation axis of the first impeller. The first ring plate is provided with a first through hole for air inlet. The second impeller includes a second ring plate and a plurality of second blades connected to the second ring plate. The plurality of second blades are circumferentially spaced along the rotation axis of the second impeller. The second ring plate is provided with a second through hole for air inlet. The minimum inner diameter of the first through hole is greater than the minimum inner diameter of the second through hole.

13. The blower according to any one of claims 1 to 12, wherein, On one side of the return duct facing the first air inlet, there is a second air inlet communicating with the first air inlet. The minimum inner diameter of the second air inlet is D1. The second impeller is provided with a second through hole for air inlet. The minimum inner diameter of the second through hole is D2, satisfying: -2 mm ≤ D1 - D2 ≤ 2 mm.

14. The fan according to any one of claims 1 to 13, wherein, The housing includes a connected air inlet housing and an air outlet volute. The air inlet housing forms the first cavity, and the air outlet volute forms the second cavity.

15. The blower according to claim 14, wherein, An air outlet channel is formed in the air outlet volute. A part of the bottom wall of the air outlet volute is recessed in a direction away from the second impeller to form a groove. The groove surrounds the second impeller and forms a part of the structure of the air outlet channel.

16. The blower according to claim 15, wherein, Along the air outlet direction of the air outlet channel, the air outlet cross-sectional area of the air outlet channel gradually increases.

17. A diffuser, comprising: A main body, the main body including a circumferential side wall; A plurality of blades movably arranged on the circumferential side wall; And An adjustment assembly connected to the blades for adjusting the positions of the blades.

18. The diffuser according to claim 17, wherein, The circumferential side wall includes a plurality of mounting holes and a plurality of first sliding grooves. The blades include: A first connecting portion rotatably inserted into the mounting hole; and A second connecting portion slidably arranged in the first sliding groove. The adjustment assembly is connected to the second connecting portion, and the adjustment assembly can drive the blades to rotate through the second connecting portion.

19. The diffuser according to claim 18, wherein, The adjustment assembly includes: An adjusting member, and the second connecting portion of each blade is connected to the adjusting member.

20. The diffuser according to claim 19, wherein The adjusting member includes a plurality of second sliding grooves, and the second connecting portion is slidably inserted into the second sliding grooves. The extending directions of the first sliding groove and the second sliding groove are different.

21. The diffuser according to claim 20, wherein The adjusting member has an annular structure, and the plurality of second sliding grooves are distributed on the circumferential side of the adjusting member.

22. The diffuser according to any one of claims 18 to 21, wherein, The adjustment assembly further includes: A rack, connected to the adjustment member, and the rack is used to drive the adjustment member to move.

23. The diffuser according to claim 22, wherein The circumferential side wall includes a third slideway, and the rack is embedded in the third slideway.

24. The diffuser according to any one of claims 17 to 23, wherein The blade includes a flexible portion, and the flexible portion is in contact with the main body.

25. The diffuser according to any one of claims 17 to 24, wherein The circumferential side wall is in a ring structure, and the adjustment assembly is located inside the circumferential side wall.

26. An exhaust pipe assembly, comprising: A pipe body, the pipe body includes a plurality of assembled parts, the plurality of assembled parts are distributed in a ring, and the plurality of assembled parts are relatively movable; And An adjustment assembly, movably arranged on the pipe body, and the adjustment assembly is used to adjust the opening area of the first end of the pipe body.

27. The exhaust pipe assembly according to claim 26, wherein, The adjustment assembly includes: An adjustment member, movably arranged on the pipe body, the adjustment member can move along the axial direction of the pipe body. When the adjustment member is in the first position, the opening area of the first end of the pipe body is the first area. When the adjustment member is in the second position, the opening area of the first end of the pipe body is the second area. The first position is farther from the first end of the pipe body than the second position, and the first area is larger than the second area.

28. The exhaust pipe assembly according to claim 27, wherein The adjustment member is in a ring structure and sleeved on the outside of the pipe body.

29. The exhaust pipe assembly according to claim 27 or 28 further includes: A rack, connected to the adjustment member, and the rack is used to drive the adjustment member to move.

30. The exhaust pipe assembly according to any one of claims 26 to 29, wherein, The assembled part includes: A main body; A convex portion, arranged on the main body; and A reset member, arranged on the main body, and the reset member abuts against the convex portion of the adjacent assembled part.

31. The exhaust pipe assembly according to claim 30, wherein Along the circumferential direction of the pipe body, the length of the first end of the main body is greater than the length of the second end of the main body.

32. The exhaust pipe assembly according to claim 30 or 31, wherein The main body includes a guiding surface, the reset member is arranged on one side of the main body, and the guiding surface is located on the side of the convex portion away from the reset member.

33. The exhaust pipe assembly according to any one of claims 26 to 32, wherein The second end of the assembled part includes a first connecting portion, and the first connecting portion is used for movably connecting with the volute main body.

34. The exhaust pipe assembly according to claim 33, wherein The first connecting portion is a spherical pair connecting portion.

35. A volute, comprising: A volute main body; And The exhaust pipe assembly according to any one of claims 26 to 34, the exhaust pipe assembly is arranged on the volute main body, and the first end of the exhaust pipe assembly faces away from the volute main body.

36. An electrical equipment, comprising: The blower according to any one of claims 1 to 16; And / or The diffuser according to any one of claims 17 to 24; and / or The exhaust pipe assembly according to any one of claims 25 to 34 or the volute according to claim 35.

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