CN218449690U - Motor and cleaning appliance - Google Patents

Abstract

The utility model discloses a motor and clean electrical apparatus. The motor comprises a waterproof assembly with a shaft hole; the rotating shaft penetrates through the shaft hole and comprises a connecting section positioned outside the shaft hole; the movable impeller is arranged on the connecting section; the fixed impeller is positioned below the movable impeller; the fixed impeller is provided with a first boss, the first boss is enclosed to form an accommodating space, and at least part of the movable impeller is accommodated in the accommodating space. In the motor, the first boss is formed on the fixed impeller, the first boss is enclosed to form an accommodating space, at least part of the movable impeller is accommodated in the accommodating space, water vapor can be effectively prevented from entering the motor from a gap between the driven impeller and the fixed impeller, and the waterproof capacity of the motor is greatly improved.

Description

Motor and cleaning appliance

Technical Field

The utility model relates to a clean electrical apparatus technical field, in particular to motor and clean electrical apparatus.

Background

Along with the improvement of the living standard of people, household cleaning appliances are more and more popularized. The household floor washing machine solves the problem that the conventional dust collector cannot absorb water, and combines the functions of dust collection and floor washing together, so that the floor is more and more easy to clean. In order to meet the water absorption requirement, the motor serving as the core component of the floor washing machine must have good waterproof performance. Meanwhile, for stronger cleaning capability, the motor is required to output larger flow and vacuum degree, which requires larger power of the motor.

The existing waterproof motor is mostly sealed by grease. Along with the improvement of the motor power, the rotating speed of the motor is increased, the vacuum degree is increased, and the grease is easier to react with water vapor, age and deteriorate and lose the sealing effect.

SUMMERY OF THE UTILITY MODEL

The utility model discloses embodiment provides a motor and clean electrical apparatus.

The embodiment of the utility model provides a motor includes:

a waterproof assembly having a shaft hole;

the rotating shaft penetrates through the shaft hole and comprises a connecting section positioned outside the shaft hole;

the movable impeller is arranged on the connecting section; and

the fixed impeller is positioned below the movable impeller;

the fixed impeller is provided with a first boss, the first boss is enclosed to form an accommodating space, and at least part of the movable impeller is accommodated in the accommodating space.

In the motor, the first boss is formed on the fixed impeller, the first boss is enclosed to form an accommodating space, at least part of the movable impeller is accommodated in the accommodating space, water vapor can be effectively prevented from entering the motor from a gap between the driven impeller and the fixed impeller, and the waterproof capacity of the motor is greatly improved.

In certain embodiments, the stator wheel further comprises a second boss, the first boss being disposed at an upper edge of the second boss.

In some embodiments, the movable impeller includes a first support plate at least partially accommodated in the accommodating space.

In some embodiments, the first support plate is spaced apart from the first boss by a distance D in the range of 0.2mm < D < 0.4mm.

In some embodiments, the first support plate has a thickness R in the axial direction of the rotating shaft, and the overlap dimension H between the first support plate and the first boss in the axial direction of the rotating shaft is in a range of 0.2mm < H < R.

In some embodiments, the movable impeller further comprises a movable blade and a shaft sleeve, and the first support plate is provided with a connecting hole;

the shaft sleeve penetrates through the connecting hole and is fixedly connected with the first supporting plate, the shaft sleeve penetrates through the connecting section, and the moving blade is arranged on one side, away from the fixed impeller, of the first supporting plate.

In some embodiments, the fixed impeller comprises a second support plate, a sleeve and a fixed blade, wherein the second support plate is provided with a nesting hole;

the waterproof component protrusion is formed with the installation department, the shaft hole sets up the middle part of installation department, nested hole cover is established the periphery of installation department, the sleeve with the second backup pad is connected, decide the blade setting and be in on the sleeve.

In some embodiments, the motor includes a fan housing, and an air duct is formed between the fan housing and the sleeve.

In some embodiments, the motor further includes a stator assembly and a rotor assembly located inside the waterproof assembly, the rotating shaft is connected to the rotor assembly, and a heat conducting material is filled between the stator assembly and the waterproof assembly.

The embodiment of the utility model provides a clean electrical apparatus is still provided, clean electrical apparatus includes the motor of above-mentioned arbitrary embodiment.

In the cleaning electric appliance, the first boss is formed on the fixed impeller and is enclosed to form the accommodating space, at least part of the movable impeller is accommodated in the accommodating space, so that water vapor can be effectively prevented from entering the motor from a gap between the driven impeller and the fixed impeller, and the waterproof capability of the motor is greatly improved.

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

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic cross-sectional view of an electric machine according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the structure of the area A in FIG. 1;

fig. 3 is a schematic cross-sectional view of a stationary impeller according to an embodiment of the present invention;

fig. 4 is a schematic perspective view of a fixed impeller according to an embodiment of the present invention;

fig. 5 is a schematic cross-sectional view of a movable impeller according to an embodiment of the present invention;

fig. 6 is a schematic perspective view of a movable impeller according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a stator assembly according to an embodiment of the present invention;

fig. 8 is an exploded schematic view of a motor according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The disclosure herein provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described herein. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present disclosure may repeat reference numerals and/or reference letters in the various examples for purposes of simplicity and clarity and do not in itself dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.

Referring to fig. 1 to 8, fig. 1 is a schematic cross-sectional view of a motor 100 according to an embodiment of the present invention; FIG. 2 is an enlarged schematic view of the structure of the area A in FIG. 1; fig. 3 is a schematic cross-sectional view of a stator blade wheel 20 according to an embodiment of the present invention; fig. 4 is a perspective view of the fixed impeller 20 according to the embodiment of the present invention; fig. 5 is a schematic cross-sectional view of the movable impeller 18 according to an embodiment of the present invention; fig. 6 is a schematic perspective view of the movable impeller 18 according to the embodiment of the present invention;

fig. 7 is a schematic structural view of a stator assembly 50 according to an embodiment of the present invention; fig. 8 is an exploded schematic view of the motor 100 according to the embodiment of the present invention.

The embodiment of the present invention provides a motor 100 including a waterproof assembly 10, a rotating shaft 14, a movable impeller 18 and a fixed impeller 20. Wherein the flashing member 10 has an axial hole 12. The shaft 14 is disposed through the shaft hole 12, and the shaft 14 further includes a connecting section 16 located outside the shaft hole 12. The movable impeller 18 is provided on the connecting section 16. The fixed impeller 20 is located below the movable impeller 18, a first boss 22 is formed on the fixed impeller 20, an accommodating space 24 is defined by the first boss 22, and at least part of the movable impeller 18 is accommodated in the accommodating space 24.

In the motor 100, the first boss 22 is formed on the fixed impeller 20, the first boss 22 is surrounded by the accommodating space 24, and the movable impeller 18 is at least partially accommodated in the accommodating space 24, so that water vapor can be effectively prevented from entering the motor 100 from a gap between the movable impeller 18 and the fixed impeller 20, and the waterproof capability of the motor 100 is greatly improved.

Specifically, referring to fig. 1 and 2, as indicated by an arrow, the axial direction of the rotating shaft 14 is an axial direction to axially divide the up-down direction of the motor 100. The embodiment of the present invention provides a motor 100 including a waterproof assembly 10, a rotating shaft 14, a movable impeller 18 and a fixed impeller 20. The waterproof assembly 10 includes a housing 56, and the housing 56 forms a cavity inside the motor 100, which can be used to accommodate other components required by the motor 100, such as the stator assembly 50 and the rotor assembly 52. The waterproof component 10 further has a shaft hole 12, the shaft hole 12 can be located at the center of the waterproof component 10, and the rotating shaft 14 penetrates through the shaft hole 12. Above the rotating shaft 14, i.e., above the motor 100, the rotating shaft 14 further includes a connecting section 16 located outside the shaft hole 12. The shaft 14 may be rotated by the stator assembly 50 and the rotor assembly 52, and the connecting section 16 may connect structures external to the shaft 14 as a power take-off shaft. The housing 56 is formed with a groove for a bearing to be inserted, and the rotating shaft 14 is inserted into the bearing and is in interference fit with the bearing, so as to axially fix the rotating shaft 14 relative to the housing 56.

The movable impeller 18 is provided on the connecting section 16, the fixed impeller 20 is positioned below the movable impeller 18, and the fixed impeller 20 and the movable impeller 18 are not in contact with each other, but have a certain gap in the axial direction. The stationary impeller 20 is formed with a first boss 22, the first boss 22 surrounds an accommodation space 24 above the stationary impeller 20, and the lower side of the movable impeller 18 is at least partially accommodated in the accommodation space 24. As can be understood, the first boss 22 blocks the gap inlet of the fixed impeller 20 and the movable impeller 18, so that water vapor can be effectively prevented from entering the motor 100 from the gap between the fixed impeller 18 and the fixed impeller 20, and the waterproof capability of the motor 100 is greatly improved. In some embodiments, the first boss 22 is shaped to match the underside profile of the impeller 18, and the first boss 22 is circular.

In certain embodiments, the stator 20 further includes a second boss 26, and the first boss 22 is disposed at an upper edge of the second boss 26. Therefore, the first boss 22 and the second boss 26 cooperate to form a vertical angle structure, the first boss 22 blocks the gap inlet of the fixed impeller 20 and the movable impeller 18 in the vertical axial direction, and the second boss 26 blocks the gap inlet of the fixed impeller 20 and the movable impeller 18 in the axial direction, so that water vapor can be more effectively prevented from entering the motor 100 from the gap between the fixed impeller 18 and the fixed impeller 20, and the waterproof capability of the motor 100 is further improved.

Specifically, referring to fig. 1 and 2, the first boss 22 is disposed at an upper edge of the second boss 26, and the first boss 22 and the second boss 26 form a vertical angle structure at a side toward the motor 100, in which one side is a side of the first boss 22 in the axial direction and the other side is a side of the second boss 26 in the vertical axial direction. Since the lower side of the movable impeller 18 is at least partially accommodated in the first boss 22, an accommodating space 24 is defined above the fixed impeller 20. Thus, the first boss 22 blocks the gap inlet of the fixed impeller 20 and the movable impeller 18 in the vertical axial direction, and the second boss 26 blocks the gap inlet of the fixed impeller 20 and the movable impeller 18 in the axial direction, so that water vapor can be more effectively prevented from entering the motor 100 from the gap between the fixed impeller 18 and the fixed impeller 20, and the waterproof capability of the motor 100 is further improved. It will be appreciated that the second boss 26 completely blocks the clearance in the axial direction between the stationary and movable impellers 20, 18.

In some embodiments, the impeller 18 includes a first support plate 28, and the first support plate 28 is at least partially received in the receiving space 24. Thus, the movable impeller 18 can be supported by the first supporting plate 28, and at least part of the first supporting plate 28 of the movable impeller 18 is accommodated in the accommodating space 24, so that water vapor can be effectively prevented from entering the motor 100 from a gap between the movable impeller 18 and the fixed impeller 20, and the waterproof capability of the motor 100 is greatly improved.

Specifically, referring to fig. 1 and 2, a first support plate 28 is disposed at a lower side of the movable impeller 18 for supporting the movable impeller 18. In one embodiment, the first support plate 28 is circular. It is understood that the first support plate 28 is not limited to the above shape, and may have other shapes, which are not specifically limited herein.

In some embodiments, the first support plate 28 is spaced from the first boss 22 by a distance D in the range of 0.2mm < D < 0.4mm. Thus, the distance D between the first support plate 28 and the first boss 22 is in the range of 0.2mm < D < 0.4mm, so that on one hand, the first support plate 28 can be prevented from contacting the first boss 22 to damage the movable impeller 18 and the fixed impeller 20 due to abnormal motion; on the other hand, the waterproof function is prevented from being lost due to overlarge distance.

Specifically, referring to fig. 2, the distance D between the first support plate 28 and the first boss 22 indicates the distance between the first support plate 28 and the first boss 22 in the vertical axial direction, and since the movable impeller 18 rotates and the fixed impeller 20 does not move during the operation of the motor 100, the first support plate 28 and the first boss 22 are not in contact with each other, and there is a gap therebetween. Too small a gap may cause the motor 100 to break the movable impeller 18 and the fixed impeller 20 due to the first support plate 28 contacting the first boss 22 due to the abnormal movement; too large a space may cause the motor 100 to lose waterproof function. Therefore, the interval D between the first support plate 28 and the first boss 22 is designed to be 0.2mm < D < 0.4mm. In some embodiments, the distance D may be 0.25mm, 0.3mm, or 0.35mm. It is understood that the distance D between the first support plate 28 and the first boss 22 is not limited to the above value, and may be other values, which are not limited in particular.

In some embodiments, the first support plate 28 has a thickness R along the axial direction of the shaft 14, and the overlap dimension H between the first support plate 28 and the first boss 22 along the axial direction of the shaft 14 ranges from 0.2mm < H < R. Thus, on the one hand, the first support plate 28 and the first boss 22 are prevented from being separated too far in the axial direction, which results in poor waterproof effect; on the other hand, the first supporting plate 28 is prevented from being completely accommodated in the accommodating space 24 to affect the air outlet of the movable impeller 18.

Specifically, referring to fig. 2, the first support plate 28 has a thickness R along the axial direction of the rotating shaft 14, the first support plate 28 is at least partially accommodated in the accommodating space 24, and the first support plate 28 and the first boss 22 have an overlapping dimension H along the axial direction of the rotating shaft 14. Too small an overlap dimension H may cause the first support plate 28 and the first boss 22 to be too far apart in the axial direction, resulting in poor waterproofing; the overlap dimension H being greater than R may cause the first boss 22 to be higher than the upper surface of the first support plate 28, blocking the outlet air of the movable impeller 18, reducing the efficiency of the motor 100. Therefore, the overlapping size H of the first support plate 28 and the first boss 22 along the axial direction of the rotating shaft 14 is designed to be 0.2mm < H < R. In some embodiments, when the first support plate 28 has a thickness of 1mm along the axial direction of the shaft 14, the overlap dimension H may be 0.1mm, 0.2mm, or 0.3mm. It is understood that the overlapping dimension H of the first support plate 28 and the first boss 22 along the axial direction of the rotating shaft 14 is not limited to the above value, and may be other values, which are not specifically limited herein.

In some embodiments, the rotor blade 18 further includes a rotor blade 30 and a bushing 32, and the first support plate 28 is provided with a connection hole 34; the shaft sleeve 32 is arranged in the connecting hole 34 and fixedly connected with the first supporting plate 28, the connecting section 16 is arranged in the shaft sleeve 32, and the moving blade 30 is arranged on the side of the first supporting plate 28, which is far away from the fixed impeller 20. Therefore, the moving blades 30 are driven by the moving blades 18 to rotate, so that high-speed airflow and vacuum degree can be generated, heat generated by the operation of the motor 100 is taken away, and the motor 100 is protected.

Specifically, referring to fig. 1 and 3 to 6, the moving blade 18 includes a first support plate 28 having a connection hole 34 at a middle portion thereof, a boss 32, and a moving blade 30. The moving blades 30 may be arranged on the first support plate 28 in a spiral shape; the shaft sleeve 32 is fixedly connected with the connecting hole 34, and the shaft sleeve 32 can be embedded in the connecting hole 34 of the first supporting plate 28 to realize fixation or can be fixed by welding. The connecting section 16 is inserted into the shaft sleeve 32, and when the rotating shaft 14 rotates, the connecting section 16 drives the first supporting plate 28 to rotate through the shaft sleeve 32, and further drives the moving blade 30 disposed on the side surface of the first supporting plate 28 to rotate, so as to drive the outside air to form an air flow, and the air flow is blown onto the surface of the motor 100 according to a preset angle under the guidance of the fixed blade 40 of the fixed blade 20, so as to take away the heat generated by the operation of the motor 100, and protect the motor 100.

In some embodiments, the stator vane 20 includes a second support plate 36, a sleeve 38, and a stator vane 40, the second support plate 36 being provided with a nesting hole 42; the waterproof assembly 10 is convexly provided with a mounting part 44, the shaft hole 12 is arranged in the middle of the mounting part 44, the embedding hole 42 is sleeved on the periphery of the mounting part 44, the sleeve 38 is connected with the second supporting plate 36, and the fixed blade 40 is arranged on the sleeve 38. In this way, the stator blades 40 of the stator wheel 20 can guide the air flow to blow on the surface of the motor 100 to remove the heat generated by the operation of the motor 100 and protect the motor 100.

Specifically, referring to fig. 1 and 3-6, the sleeve 38 is connected to the second support plate 36, and the stator blades 40 are circumferentially disposed on the sleeve 38. The stator blades 40 may have a plurality of pieces and may be spirally arranged on the outer circumference of the sleeve 38. The sleeve 38 and the fixed blade 40 may be integrally formed by metal powder or integrally cast by plastic mold opening, or may be separately processed by means of separate processes, and then assembled and fixed by bolts or welded and fixed. When the rotating shaft 14 rotates, the rotating impeller 18 rotates along with the rotating shaft, and the external air forms an airflow under the action of the rotating impeller 18 and is blown onto the surface of the motor 100 according to a preset angle under the guidance of the fixed blades 40, so as to take away heat generated by the operation of the motor 100 and protect the motor 100.

In some embodiments, the electric machine 100 includes a hood 46, and an air duct 48 is formed between the hood 46 and the sleeve 38. Therefore, water vapor can be prevented from entering the motor 100, and the waterproof capability of the motor 100 is greatly improved.

Specifically, referring to fig. 1 and 2, the wind channel 48 formed by the wind shield 46 and the sleeve 38 serves as an outer region of the receiving space 24 of the stationary impeller 20, and the outer region is an inner region for protecting the structure of the bearing, the rotor assembly 52, the stator assembly 50, and the like. When the movable impeller 18 rotates, the external air enters the inside of the wind shield 46 through the air inlet 54 and flows to the stationary impeller 20 through the wind channel 48, that is, the gas in the outer region may flow at a high speed, and the gas in the inner region may remain relatively stationary due to the obstruction of the first boss 22 and the second boss 26. The gas that flows at a high speed can reduce atmospheric pressure, cause the atmospheric pressure of outside area to be less than the atmospheric pressure of inside area promptly, and the gas of inside area will be inhaled in the outside area through the clearance between first boss 22 and the first backup pad 28 to effectively prevent outside area's steam to enter into in the inside area, effectively prevent steam to enter, and then avoid steam to influence structures such as bearing, rotor subassembly 52 and stator module 50, greatly improved motor 100's waterproof ability.

In some embodiments, the electric machine 100 further includes a stator assembly 50 and a rotor assembly 52 located inside the waterproof assembly 10, the rotating shaft 14 is connected to the rotor assembly 52, and a heat conductive material is filled between the stator assembly 50 and the waterproof assembly 10. In this manner, the motor 100 can be protected.

Specifically, referring to fig. 1 and 7, the stator assembly 50 is a stationary portion of the electric machine 100, generally comprised of a machine base, a stator core, and stator windings (not labeled). The stator core is generally formed by punching and laminating silicon steel sheets with insulating layers on the surfaces, and uniformly distributed grooves are punched in the inner circle of the stator core and used for placing stator windings; the stator winding is generally formed by connecting three windings which are mutually separated by 120 degrees in space and have completely the same structure, and each coil of the windings is respectively placed in a stator slot according to a certain rule and can generate a rotating magnetic field when being electrified; the base is generally used to fix the stator core and the front and rear end covers to support the rotor, and to perform protection, heat dissipation, and the like. The rotor assembly 52 is the rotating part of the electric machine 100 and typically includes permanent magnets and the shaft 14. The permanent magnet is generally made of neodymium iron boron or other magnetic materials, and has a cylindrical shape with a hole at the center through which it is adhered to the rotating shaft 14. The stator winding generates a rotating magnetic field after being energized, attracts the permanent magnet on the rotating shaft 14, forms an electromagnetic torque, and rotates the rotating shaft 14. The shaft 14 serves to transmit torque and support the weight of the rotor assembly 52.

The motor 100 may also include other components, including, for example, end caps for support, bearings for connecting the rotating and stationary parts, and electrical circuitry. The circuit part generally includes power Control components such as a MOS transistor (MOSFET) and an MCU (Motor Control Unit), and the power Control components are usually mounted on a circuit board.

The embodiment of the present invention also provides a cleaning appliance, which may include the motor 100 of any of the above embodiments.

In the cleaning electrical apparatus, the first boss 22 is formed on the fixed impeller 20, the first boss 22 encloses the accommodating space 24, and the movable impeller 18 is at least partially accommodated in the accommodating space 24, so that water vapor can be effectively prevented from entering the motor 100 from a gap between the movable impeller 18 and the fixed impeller 20, and the waterproof capability of the motor 100 is greatly improved.

In particular, the cleaning appliance may include, but is not limited to, a vacuum cleaner, a sweeping robot, and the like. The motor 100 serves to generate a vacuum degree, provide suction force, etc. to thereby perform a cleaning function of cleaning the electric appliance.

In the description of the present specification, reference to the description of "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. An electric machine, comprising:

a waterproof assembly having a shaft hole;

the rotating shaft penetrates through the shaft hole and comprises a connecting section positioned outside the shaft hole;

the movable impeller is arranged on the connecting section; and

the fixed impeller is positioned below the movable impeller;

the fixed impeller is provided with a first boss, the first boss is enclosed to form an accommodating space, and at least part of the movable impeller is accommodated in the accommodating space.

2. The electric machine of claim 1, wherein the fixed impeller further comprises a second boss, the first boss being disposed at an upper edge of the second boss.

3. The electric machine of claim 1, wherein the impeller comprises a first support plate at least partially received in the receiving space.

4. A motor according to claim 3, wherein the first support plate is spaced from the first boss by a distance D in the range 0.2mm < D < 0.4mm.

5. The motor according to claim 3, wherein the first support plate has a thickness R along the axial direction of the rotating shaft, and an overlapping dimension H between the first support plate and the first boss along the axial direction of the rotating shaft is in a range of 0.2mm < H < R.

6. The motor of claim 3, wherein the movable impeller further comprises a movable blade and a shaft sleeve, and the first support plate is provided with a connecting hole;

the shaft sleeve penetrates through the connecting hole and is fixedly connected with the first supporting plate, the connecting section penetrates through the shaft sleeve, and the moving blade is arranged on one side, away from the fixed impeller, of the first supporting plate.

7. The motor of claim 1, wherein the fixed impeller comprises a second support plate, a sleeve and a fixed blade, the second support plate is provided with a nesting hole;

the waterproof component protrusion is formed with the installation department, the shaft hole sets up the middle part of installation department, nested hole cover is established the periphery of installation department, the sleeve with the second backup pad is connected, decide the blade setting and be in on the sleeve.

8. The electric machine of claim 7, comprising a fan housing, wherein an air channel is formed between the fan housing and the sleeve.

9. The electric machine according to any one of claims 1 to 8, further comprising a stator assembly and a rotor assembly located inside the water-proof assembly, wherein the rotating shaft is connected with the rotor assembly, and a heat conducting material is filled between the stator assembly and the water-proof assembly.

10. A cleaning appliance, characterized in that it comprises an electric machine according to any one of claims 1-9.

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