Motor and surface cleaning device

Abstract

The utility model provides a motor and a surface cleaning device, and the motor comprises a base housing which is internally provided with a first accommodation cavity; the motor main body is accommodated in the first accommodating cavity and comprises a rotating shaft, a rotor, a stator and a driving plate, and the rotating shaft extends out of the base shell; the movable impeller is connected to the extending end of the rotating shaft and is configured to rotate to generate airflow; the fan cover is arranged around the movable impeller and is configured to guide the airflow; and the at least one high-rotating-speed composite bearing is used for supporting the rotating shaft on the base shell.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a motor and a surface cleaning device. BACKGROUND

[0002] In surface cleaning apparatus, the motor rotor is usually required to operate at high rotational speed, for example tens of thousands to hundreds of thousands of revolutions per minute, to drive the impeller to generate sufficient airflow for cleaning. The increase in rotational speed of the motor rotor relies on the rolling bearing of the high rotational speed rotating environment, and the motor system integrating such bearing. The bearing design aims to provide efficient rotating support, reduce friction and noise, and prolong service life, while adapting to the needs of wet cleaning environment. In the field of household surface cleaning devices, motor design focuses on applying high-speed low-loss bearings to rotor support to achieve stable airflow generation and high cleaning performance. SUMMARY

[0003] According to various embodiments described herein, a motor and a surface cleaning device are provided.

[0004] According to one aspect of the present disclosure, a motor for a surface cleaning device is provided, the motor comprising:

[0005] a base shell, inside which a first accommodating cavity is formed;

[0006] a motor body accommodated in the first accommodating cavity, comprising a rotating shaft, a rotor, a stator and a driving plate, the rotating shaft extending to the outside of the base shell;

[0007] a dynamic impeller connected to the extending end of the rotating shaft and configured to rotate to generate airflow;

[0008] a shroud arranged around the dynamic impeller and configured to guide the airflow;

[0009] at least one high-speed composite bearing for supporting the rotating shaft in the base shell, the high-speed composite bearing comprising:

[0010] a rotating element configured to be fixed to the rotating shaft and rotate with the rotating shaft;

[0011] an outer frame arranged concentrically around the rotating element;

[0012] an intermediate raceway component located between the rotating element and the outer frame and configured to be freely rotatable;

[0013] an inner bearing component arranged between the rotating element and the intermediate raceway component, comprising an inner retainer and a plurality of inner balls embedded in the inner retainer, the inner balls rolling along an outer raceway on the rotating element and an inner raceway of the intermediate raceway component;

[0014] An outer bearing component disposed between the intermediate raceway component and the outer frame includes an outer retainer and a plurality of outer balls embedded in the outer retainer, the outer balls rolling along an outer raceway of the intermediate raceway component and an inner raceway of the outer frame;

[0015] The inner bearing component and the outer bearing component are separated by the intermediate raceway component, such that the inner bearing component and the outer bearing component can rotate independently of each other.

[0016] According to one implementation form of the motor, the at least one high-speed composite bearing comprises a first high-speed composite bearing and a second high-speed composite bearing, the first high-speed composite bearing and the second high-speed composite bearing being arranged separately along a longitudinal direction of the rotating shaft.

[0017] According to another aspect of the disclosure, there is provided a surface cleaning device comprising a motor as described above. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary examples of the disclosure and together with the description serve to explain the principles of the disclosure.

[0019] Figure 1 is a perspective view of a high-speed composite bearing according to one example of the disclosure.

[0020] Figure 2 is an exploded view of a high-speed composite bearing according to one example of the disclosure.

[0021] Figure 3 is a perspective view of a high-speed composite bearing according to one example of the disclosure.

[0022] Figure 4 is a perspective view of a surface cleaning device motor using a bearing according to one example of the disclosure. DETAILED DESCRIPTION

[0023] The disclosure will be described in further detail below with reference to the drawings and examples. It is to be understood that the specific examples described herein are intended to be illustrative only and are not in any way limiting of the disclosure. In addition, it should be noted that, for the sake of brevity, only the parts of the drawings that are necessary for an understanding of the disclosure have been shown.

[0024] It should be noted that the examples in the disclosure and the features in the examples can be combined with each other without conflict. The technical solutions of the disclosure will be described in detail below with reference to the drawings and examples.

[0025] Unless otherwise indicated, the exemplary examples / examples shown are to be understood as exemplary features that provide examples of various details that can be employed in practicing the inventive concepts of the present disclosure. Thus, unless otherwise indicated, features of various examples / examples can additionally be combined, separated, interchanged, and / or rearranged, without departing from the inventive concepts of the present disclosure.

[0026] The existing waterproof design of the floor cleaning machine motor has significant deficiencies. The main problem is that the sealing ability of the single-layer labyrinth ring or oil seal is limited, and it cannot effectively prevent liquid from entering the motor interior through the gap between the rotating shaft and the shell. In the operation of the floor cleaning machine, water vapor or liquid splashing is inevitable, and the traditional waterproof structure is difficult to cope with continuous or high-pressure liquid intrusion, resulting in short circuit or burning of electrical components (such as the drive board) due to moisture. This failure not only reduces the service life of the motor, but also can cause equipment failure, increasing maintenance costs. In addition, the single-layer waterproof design further reduces the sealing performance when facing dynamic operation (such as high-speed rotation of the rotating shaft), and the risk of water vapor penetration increases. Therefore, there is an urgent need for a motor structure that can provide strong waterproof effect in a high-humidity environment to ensure the safe operation of electrical components while maintaining the simplicity of assembly and cost-effectiveness.

[0027] The present disclosure provides a motor for a floor cleaning machine, which solves the above technical problems through a multi-layer waterproof structure. The motor includes a base shell, a motor body, an impeller, and a fan cover. The base shell forms a first accommodating cavity inside to accommodate the motor body, which includes a rotating shaft, a rotor, a stator, and a drive board. The rotating shaft extends to the outside of the base shell and connects the impeller to generate airflow. The motor is provided with a waterproof sealing structure on the side of the rotating shaft extending out of the base shell. This structure forms a triple protective barrier through a multi-layer labyrinth design and waterproof grease filling to prevent liquid from entering the first accommodating cavity. The waterproof sealing structure includes a double-sided labyrinth ring and a sealing part, which is composed of the inner side of the stator and the outer side of the base shell, respectively forming a first labyrinth structure (the upper side of the labyrinth ring and the stator), a second labyrinth structure (the lower side of the labyrinth ring and the outer side of the base shell), and a third labyrinth structure (the inner wall and the outer wall of the base shell). Each labyrinth structure prolongs the liquid penetration path through the staggered matching of the protrusions and grooves, and fills the waterproof grease to enhance the sealing performance. This scheme isolates the drive board from external moisture through multiple physical barriers and grease filling, ensuring the reliable operation of the motor in a humid environment.

[0028] The motor of the present disclosure is filled with multi-layer labyrinth structure and waterproof grease, which significantly improves the waterproof performance. Tests show that it can reach IPX7 level and can be immersed in 1 meter of water for 30 minutes without damage. Compared with the single-layer labyrinth ring or oil seal of the prior art, the present disclosure effectively prevents liquid intrusion through a triple waterproof barrier, ensures the safe operation of the drive plate in a high humidity environment (such as a scrubber), and prolongs the service life of the motor. The staggered matching of the protrusions and grooves design prolongs the liquid penetration path, and the grease filling fills the small gaps, enhancing the dynamic sealing effect and overcoming the risk of failure of the traditional design when the rotating shaft rotates. In addition, the detachable design of the base shell and the rear cover simplifies the assembly process and reduces production and maintenance costs. Compared with the prior art which relies on complex seals or high-cost materials, the present solution achieves strong waterproofing with a simple structure, taking into account economy and reliability, and is particularly suitable for household and industrial scrubbers, with significant commercial value.

[0029] Other aspects of the present disclosure will be in part apparent from the following detailed description, in part will be apparent from the description, or can be learned by the practice of the present disclosure. One embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0030] The configurations shown in the embodiments described herein and the accompanying drawings are only exemplary embodiments of the present disclosure, which can be modified in various ways at the time of filing this application to replace the embodiments described herein and the accompanying drawings.

[0031] In addition, the same reference numbers or marks shown in the accompanying drawings herein represent elements or components that perform substantially the same functions.

[0032] Likewise, the terms used herein are used to describe the embodiments and are not intended to limit and / or restrict the present disclosure. Unless the context clearly indicates otherwise, the singular forms "a," "an," and "the" also include the plural forms. In this document, the terms "include," "have," and the like are used to specify the presence of features, numbers, steps, operations, elements, components, or combinations thereof, but do not exclude the presence or addition of one or more other features, elements, steps, operations, components, or combinations thereof.

[0033] It can be understood that although the terms "first," "second," "third," and the like may be used herein to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present disclosure, a first element can be referred to as a second element, and a second element can be referred to as a first element. The term "and / or" includes a combination of multiple related items or any one of the multiple related items.

[0034] In the following detailed description, the terms "front side," "rear side," "left side," "right side," and the like can be defined by the accompanying drawings, but the shape and position of the components are not limited by these terms.

[0035] In surface cleaning devices, such as household surface vacuum cleaning equipment, conventional single-row ball bearings are prone to overheating, wear and damage to the cage due to intense friction between the balls and the raceway at high rotational speeds, which in turn causes vibration, noise and even bearing failure. In particular, in some wet cleaning environments, bearings need to withstand additional environmental challenges, such as moisture intrusion, which can further accelerate wear and reduce service life. In addition, high-speed operation is often accompanied by high-frequency noise, affecting user experience. In existing designs, the single bearing structure is difficult to balance the requirements of high-speed rotation and long-term stability, limiting the improvement of device performance.

[0036] The utility model provides a kind of high-speed composite bearing, and the above-mentioned problem is solved by innovative multi-row rolling structure.Bearing includes rotating element, outer frame and intermediate raceway component between the two, intermediate raceway component is configured to be freely rotatable, isolates inner side and outer side bearing component.Inner side bearing component includes inner cage and inner ball, along the raceway of rotating element and intermediate raceway component rolling;Outer side bearing component includes outer cage and outer ball, along the raceway of intermediate raceway component and outer frame rolling.This structure makes inner side and outer side bearing component rotate independently, decomposes high speed into two lower speed rolling, so as to significantly reduce the rotation speed, friction heat and noise of ball.The cover plate on both sides of outer frame fixes each component as a whole, enhances structural stability and protects wet environment.The radial symmetric thickness of intermediate raceway component balances load, and the roughness Ra of raceway surface is less than 0.2 microns to further reduce friction.The utility model also includes a motor, integrates the bearing to support rotating shaft, includes base shell, motor body, moving impeller and wind shield, realizes efficient rotation and airflow guidance by single bearing or double bearing configuration, especially suitable for wet surface cleaning device.

[0037] The utility model has the beneficial effect of significantly improving the performance and reliability of the motor rotor of the surface cleaning device.Through the separation effect of intermediate raceway component, bearing decomposes rotation speed, reduces the relative rotation speed of inner ball and outer ball, for example, decomposes 240,000 revolutions per minute into about 120,000 revolutions per minute rolling speed, friction coefficient is reduced to about 0.0008, temperature rise is controlled within 50 DEG C, wear amount is less than 0.01 millimeter / 1000 hours.Compared with traditional single-row bearing, the limit speed is increased from 120,000 revolutions per minute to 240,000 revolutions per minute, and the service life is extended from hours to more than 500 hours.Cover plate design provides IP54 level protection, noise is less than 40 decibels, suitable for wet environment.Ball axis is perpendicular to central shaft and inner and outer balls of different diameters optimize load distribution, vibration acceleration is less than 0.5 m / s square.Motor realizes stable rotating shaft support through high-speed bearing, airflow output efficiency is improved by about 20%, which significantly enhances the cleaning ability of wet cleaning device.The utility model has the advantages of simple structure, low manufacturing cost, high efficiency, long service life and low noise, and provides a reliable technical solution for surface cleaning equipment.

[0038] As Figure 1 shown, the high-speed composite bearing 100 is a multi-row rolling bearing structure, aiming to achieve high-speed rotation of the surface cleaning device motor rotor, with a maximum speed of 240,000 rpm, while reducing friction loss, vibration and noise, and prolonging the service life to more than 500 hours. The bearing 100 decomposes high-speed rotation into two lower-speed rolling by configuring a freely rotatable intermediate raceway component 150, optimizes load distribution, and adapts to the needs of wet cleaning environment.

[0039] In combination Figure 2 and Figure 3 shown, the bearing 100 is annular in shape, including a rotating element 110, an inner bearing component 130, an intermediate raceway component 150, an outer bearing component 170, and an outer frame 190, which cooperatively form an efficient and stable rolling support system. Through the relative rolling fit between the rotating element 110, the inner bearing component 130, the intermediate raceway component 150, the outer bearing component 170, and the outer frame 190, the power transmission and friction reduction between the rotating element 110 and the outer frame 190 are achieved, enhancing the reliability and durability in high-speed environment.

[0040] As Figure 2 shown, the bearing 100 is annular in shape, and the rotating element 110, the inner bearing component 130, the intermediate raceway component 150, the outer bearing component 170, and the outer frame 190 are arranged coaxially.

[0041] In combination Figure 1 and Figure 2 shown, taking the rotating element 110 driven by a driving element (such as a motor rotor shaft) as an example, the rotating element 110 rotates around the central axis, and the outer raceway 111 of the rotating element 110 rolls relative to the inner raceway 131 of the inner bearing component 130, and drives the inner bearing component 130 to rotate around the central axis under the action of friction. The intermediate raceway component 150 separates the inner bearing component 130 and the outer bearing component 170, and transmits the rotating force to the outer bearing component 170 through the inner raceway 151 and the outer raceway 152. The outer frame 190 remains relatively stationary, and the rolling balls 171 of the outer bearing component 170 roll along the inner raceway 191 of the outer frame 190. In some embodiments, the bearing 100 also includes a protective cover 200 covering both sides of the outer frame 190, forming an IP54 level seal to prevent dust and liquid from entering.

[0042] The components of bearing 100 are arranged in a structural order from inner to outer, with rotating element 110 transmitting torque to inner bearing component 130, intermediate raceway component 150 decomposing rolling speed, outer bearing component 170 stabilizing load with outer housing 190, and the combination of raceways and lubrication grooves improving rolling efficiency. Intermediate raceway component 150 allows each of balls 131 and 171 to roll through half a revolution, and under ideal conditions, the speed limit is increased from 120,000 revolutions per minute to 240,000 revolutions per minute compared to a traditional single-row bearing, with overall bearing noise below 40 decibels and vibration acceleration below 0.5 m / s2. In some embodiments, the number of balls 131 and 171 is 7 and 10, respectively, and the load capacity can reach 2000 N.

[0043] The components of bearing 100 cooperate in layers according to function. Rotating element 110 is driven by a driving element (such as a motor rotor shaft), serving as the starting point of torque transmission, and rotates at high speed and drives inner bearing component 130 to roll. Inner bearing component 130 transmits the inner load and reduces friction by cooperating with the raceways of rotating element 110 and intermediate raceway component 150 through balls 131, similar to the rolling mechanism of a conventional ball bearing. Intermediate raceway component 150, as the core separation component, can rotate freely, isolating inner bearing component 130 from outer bearing component 170, decomposing the rotation speed, and reducing the rolling speed of the balls, thereby breaking through the speed limit of traditional single-row bearings. Outer bearing component 170 transmits the outer load and maintains overall stability by cooperating with the raceways of intermediate raceway component 150 and outer housing 190 through balls 171. Outer housing 190, as a stationary component, is fixed to an external device (such as a motor housing), provides structural support, and integrates all components into a closed whole through protective cover 200. Each component is dynamically connected through the rolling cooperation of raceways and balls, and the free rotation of intermediate raceway component 150 allows the inner and outer rolling to operate independently, significantly improving the speed limit and durability.

[0044] In some embodiments, the driving member of the rotating element 110 is a cylindrical rigid member with an axial length of about 15 mm and a diameter of 10 mm, and the outer circumferential surface of the driving member forms an outer raceway 111 with a semicircular arc cross-section, an arc depth of 0.5 mm, and an arc width of 2.1 mm. The design follows the general geometric constraint principle in the bearing field to ensure the stable trajectory of the balls 131. The rotating element 110 is made of high-strength alloy steel GCr15, and is subjected to quenching and tempering treatment, with a hardness of HRC 60-62 and a surface roughness of Ra 0.08-0.1 microns. The rotating element 110 is precisely polished to reduce frictional resistance. The rotating element 110 is located at the innermost layer of the bearing 100, and is fixedly connected with the motor rotor through a 2 mm wide key groove or an interference fit. The central shaft is coaxial with the bearing as a whole, and the axial positioning error is less than 0.03 mm. The rotating element 110 is in contact with the balls 131 of the inner bearing component 130 through the outer raceway 111, and drives the balls 131 to roll. The rolling resistance is controlled to be less than 0.1 N, and the friction heat temperature rise is lower than 50℃. The rolling cooperation between the rotating element 110 and the inner bearing component 130 forms an inner power transmission path, which is the starting point of the motion of the entire bearing system. The rigid design and the optimization of the raceway geometry work together to ensure efficient torque transmission.

[0045] The inner bearing component 130 includes an annular inner retainer 132 and 7 balls 131. The retainer is a single-piece structure and is provided with 7 equidistant mounting holes. The inner retainer 132 is made of polyimide PI-66, with a density of 1.4 g / cm³ and a tensile strength of 150 MPa, which has light weight and high toughness. The balls 131 are made of silicon carbide ceramic, with a hardness of HV1800 and a surface roughness of Ra 0.05 microns, which improves wear resistance and high temperature stability. The inner bearing component 130 is located between the rotating element 110 and the intermediate raceway component 150. The balls 131 are in contact with the outer raceway 111 of the rotating element 110 and the inner raceway 151 of the intermediate raceway component 150. The center of the retainer is coaxial with the rotating element 110, and the axial positioning error is less than 0.02 mm. The balls 131 roll along the outer raceway 111 and the inner raceway 151, with a rolling speed of about 120,000 revolutions per minute, a radial load of 500 N, a friction coefficient of about 0.0008, and a temperature rise controlled within 40-50℃. The inner retainer 132 restricts the axial displacement of the balls 131 by a flange, with a displacement of less than 0.01 mm, ensuring the stability of the rolling trajectory. The inner bearing component 130 decomposes the torque of the rotating element 110 to the intermediate raceway component 150, and cooperates with the rotating element 110 to form an inner rolling system. The precise cooperation between the balls and the raceways optimizes the load transmission efficiency and reduces friction loss.

[0046] As Figure 2As shown, the intermediate raceway component 150 is a ring-shaped member, the inner and outer sides form the inner raceway 151 and the outer raceway 152, respectively, and the raceway cross-section is a semicircular arc. The inner raceway arc depth of the intermediate raceway component 150 is 0.5 millimeters, and the outer raceway arc depth is 0.6 millimeters. The raceway surface is provided with a micro-lubrication groove, the groove width is 0.1 millimeters, and the groove depth is 0.05 millimeters, to enhance the distribution of lubricant. The intermediate raceway component 150 is made of high-hardness stainless steel SUS440C, and the inner and outer raceway surfaces are treated by chemical vapor deposition coating, the coating thickness is 2 microns, the surface roughness Ra is 0.15-0.2 microns, the hardness is HRC58, and the wear resistance is improved. The intermediate raceway component 150 is arranged between the inner bearing component 130 and the outer bearing component 170, configured to be freely rotatable, coaxial with the rotating element 110, and the radial clearance is controlled within 0.01 millimeters. The free rotation of the intermediate raceway component 150 enables the independent movement of the inner bearing component 130 and the outer bearing component 170, decomposes the 240,000 revolutions per minute of the rotating element 110 into two stages of rolling, the rolling speed of the ball 171 is reduced to about 120,000 revolutions per minute, the friction heat temperature rise is lower than 50℃, and the wear amount is lower than 0.01 millimeters / 1000 hours. The inner raceway 151 and the outer raceway 152 of the intermediate raceway component 150 are matched with the ball 131 and the ball 171, respectively, to transmit a load of 500-1000 N, a friction coefficient of 0.0008, and a vibration amplitude of less than 0.02 millimeters. The intermediate raceway component 150 optimizes the load distribution by isolating the inner and outer rolling systems, forms the core link of power decomposition and transmission with the rotating element 110, the inner bearing component 130, and the outer bearing component 170, reduces the friction resistance, and improves the high-speed stability.

[0047] As Figure 2As shown, the outer bearing component 170 includes an annular outer retainer 172 and 10 balls 171, the outer retainer 172 is a single-piece structure with 10 equidistant mounting holes, the hole diameter is 2.55 mm, and the inner wall of the mounting hole is provided with a flange with a height of 0.12 mm. The ball 171 has a diameter of 2.5 mm, which is suitable for the larger diameter of the outer raceway. The outer retainer 172 is made of polyimide PI-66 with a density of 1.4 g / cm³; the ball 171 is made of silicon carbide ceramic with a hardness of HV1800 and a surface roughness of Ra 0.05 microns. The outer bearing component 170 is arranged between the intermediate raceway component 150 and the outer frame 190, the balls 171 are in contact with the outer raceway 152 of the intermediate raceway component 150 and the inner raceway 191 of the outer frame 190, the center of the retainer is coaxial with the rotating element 110, and the axial positioning error is less than 0.02 mm. The ball 171 rolls along the outer raceway 152 with a rolling speed of about 120,000 rpm, a radial load of 800 N, a friction coefficient of 0.0008, and a vibration acceleration of less than 0.5 m / s². The outer retainer 172 restricts the axial displacement of the ball 171 by the flange, and the displacement is less than 0.01 mm. The outer bearing component 170 is isolated from the inner bearing component 130 by the intermediate raceway component 150, and cooperates with the intermediate raceway component 150 and the outer frame 190 to form an outer rolling system to stably transmit the load, and the number of balls is reduced compared to the inner side to optimize the rolling speed and load matching.

[0048] As shown in Figure 2 The outer frame 190 is an annular member, and the inner side thereof forms an inner raceway 191 with a semicircular arc cross-section and an arc depth of 0.6 mm. The surface of the raceway is provided with a lubrication groove with a width of 0.1 mm and a depth of 0.05 mm. The outer frame 190 is made of high-strength aluminum alloy 7075-T6 with a density of 2.8 g / cm³, and the surface is treated by anodic oxidation with a film thickness of 20 microns to enhance corrosion resistance. The outer frame 190 is fixed to the motor housing by four M3 threaded holes or positioning pins as a stationary member. The outer frame 190 cooperates with the balls 171 of the outer bearing component 170 through the inner raceway 191 to bear a load of 1000 N. Protective cover plates 200 are provided on both sides of the outer frame 190, the cover plates are annular sheets with a thickness of 1 mm, made of stainless steel SUS304, fixed by six M2 bolts, with an axial gap of 0.05 mm, a protection level of IP54, and a bearing overall noise of less than 40 decibels. The protective cover plates 200 integrate the rotating element 110, the intermediate raceway component 150, the inner bearing component 130, and the outer bearing component 170 into a closed whole, cooperates with the outer bearing component 170 to provide structural support and environmental isolation, and optimizes the rolling efficiency of the balls 171 through the lubrication groove design.

[0049] As shown in Figure 4As shown, the present disclosure proposes a motor. The motor is particularly suitable for household surface cleaning equipment, and the motor comprises: a shroud 310, a base shell 320, a motor body installed in the base shell 320, and a moving impeller 340 installed in the shroud 310. The inside of the base shell 320 is hollow to form a first accommodating cavity 321, so as to facilitate the installation of the motor body to the base shell 320. The motor comprises a rear cover 322, the inside of the base shell 320 is hollow and the bottom end is open, and the rear cover 322 is detachably covered at the bottom opening of the base shell 320 to form the first accommodating cavity 321. In this way, when the motor body is installed, the rear cover 322 can be conveniently removed from the base shell 320, and the motor body can be conveniently installed in the base shell 320. The motor body comprises a rotating shaft 331 rotatably arranged in the shroud 310 and the base shell 320, a magnetic ring 332 located in the first accommodating cavity 321 and fixed to the rotating shaft 331, a stator 333 located in the first accommodating cavity 321 and arranged around the outer periphery of the magnetic ring 332, and a circuit board (not shown) located in the first accommodating cavity 321 and electrically connected to the stator 333.

[0050] The rotating shaft 331 is rotatably supported at both ends of the base shell 320 by the bearing 100 of the present disclosure. In one example, the bearings 100 are arranged in the longitudinal direction of the rotating shaft 331 to rotatably support the rotating shaft 331 inside the base shell 320. The part of the rotating shaft 331 extending outside the base shell 320 is connected to the moving impeller 340. In the present disclosure, the top end of the rotating shaft 331 extends outside the base shell 320, and the top end of the rotating shaft 331 is connected to the moving impeller 340, which rotates with the rotating shaft 331. The shroud 310 is arranged on the side of the base shell 320 away from the rear cover 322 and covers the moving impeller 340. The inside of the shroud 310 is hollow to form a second accommodating cavity 311. The second accommodating cavity 311 is formed with an air inlet communicating with the second accommodating cavity 311 on the side of the shroud 310 away from the shroud 310, and the second accommodating cavity 311 is formed with an air outlet communicating with the second accommodating cavity 311 on the side of the shroud 310 close to the shroud 310. The moving impeller 340 is located in the second accommodating cavity 311. The moving impeller 340 has a moving impeller air inlet and a moving impeller air outlet, the moving impeller air inlet communicates with the stationary impeller, and the moving impeller air outlet communicates with the outside atmosphere. When the rotating shaft 331 drives the moving impeller 340 to rotate, air enters the second accommodating cavity 311 from the air inlet, and then flows to the moving impeller air outlet through the moving impeller air inlet, so as to realize the vacuumizing effect of the moving impeller 340 in the second accommodating cavity 311, thereby forming negative pressure in the second accommodating cavity 311.

[0051] The motor further comprises a fixed impeller, which has the functions of guiding the airflow and reducing noise. The fixed impeller is detachably arranged at the top end of the base shell 320 and located inside the air baffle. In order to improve the guiding effect of the airflow, the fixed impeller comprises a first fixed impeller 361 and a second fixed impeller 362, which are fixedly arranged at the top end of the base shell 320 by screws. After the one end of the rotating shaft 331 extends to the outside from the base shell 320, it sequentially passes through the second fixed impeller 362, the first fixed impeller 361 and the movable impeller 340, that is, the second fixed impeller 362, the first fixed impeller 361 and the movable impeller 340 are sequentially arranged from the air inlet to the air outlet. Among them, the air baffle 310 covers the movable impeller 340 and the first fixed impeller 361 and abuts against the side of the second fixed impeller 362 away from the air baffle 310, so that the second fixed impeller 362 and the air baffle 310 jointly form a second accommodating cavity 311. The movable impeller 340 and the first fixed impeller 361 are located in the second accommodating cavity 311. When the movable impeller 340 rotates, the airflow enters from the air inlet at the bottom end of the second fixed impeller, then flows to the movable impeller 340 through the first fixed impeller 361, and then is discharged through the air outlet after passing through the movable impeller 340, and the airflow discharged from the air baffle 310 enters the external atmosphere. By arranging the first fixed impeller 361 and the second fixed impeller 362, the guiding effect of the airflow can be improved, more air volume can be guided per unit time, and the power of the movable impeller 340 to suck air can be improved.

[0052] Through the above exemplary description, the structural characteristics of the high-speed composite bearing 100 of the utility model are fully presented. The separation of the intermediate raceway part 150 realizes the independence of the inner and outer rolling, and the optimized design of the raceway and the lubricating groove reduces the speed of the ball in stages, thereby ensuring high speed while reducing friction loss and vibration, and optimizing the rotation efficiency and stability. By arranging the motor of the bearing 100 of the present disclosure, the current single-row bearing life bottleneck and high-frequency sharp sound problem of high power, high speed, high efficiency, small size (three high and one small) are solved, and the vacuum rate of the motor is effectively improved. Therefore, the surface cleaning device using the motor can provide higher suction efficiency in the same time, reduce noise, and optimize user experience.

[0053] The above description of the examples of the present disclosure is for the purpose of illustration; it is not intended to be exhaustive or to limit the present disclosure to the precise form disclosed. Those skilled in the relevant art can understand that many modifications and variations are possible based on the above disclosure.

[0054] Finally, the language used in the specification has been principally selected for readability and instructional purposes and can not have been selected to delineate or circumscribe the subject of the present disclosure. Accordingly, the scope of the present disclosure is intended to be defined solely by the claims that are submitted herewith for prosecution, and accordingly, the disclosure of this patent document is to be considered as merely illustrative of the subject matter of the present disclosure, and is subject to change in accordance with further patent prosecution.

Claims

1. A motor for a surface cleaning apparatus, characterized by, The motor comprises: a base shell, inside which a first accommodating cavity is formed; a motor body accommodated in the first accommodating cavity, comprising a rotating shaft, a rotor, a stator and a driving plate, the rotating shaft extending to outside of the base shell; a moving impeller connected to an extending end of the rotating shaft, configured to rotate to generate airflow; a shroud arranged around the moving impeller, configured to guide the airflow; at least one high-speed composite bearing for supporting the rotating shaft in the base shell, the high-speed composite bearing comprising: a rotating element configured to be fixed to the rotating shaft and rotate with the rotating shaft; an outer frame arranged concentrically around the rotating element; an intermediate raceway component located between the rotating element and the outer frame, configured to be freely rotatable; an inner bearing component arranged between the rotating element and the intermediate raceway component, comprising an inner retainer and a plurality of inner balls embedded in the inner retainer, the inner balls rolling along an outer raceway on the rotating element and an inner raceway of the intermediate raceway component; an outer bearing component arranged between the intermediate raceway component and the outer frame, comprising an outer retainer and a plurality of outer balls embedded in the outer retainer, the outer balls rolling along an outer raceway of the intermediate raceway component and an inner raceway of the outer frame; wherein the inner bearing component and the outer bearing component are separated by the intermediate raceway component, so that the inner bearing component and the outer bearing component can rotate independently of each other.

2. The motor of claim 1, wherein The at least one high-speed composite bearing comprises a first high-speed composite bearing and a second high-speed composite bearing, the first high-speed composite bearing and the second high-speed composite bearing being arranged separately along a longitudinal direction of the rotating shaft.

3. A surface cleaning device characterized by, The motor comprises: the motor as claimed in any one of claims 1 or 2.

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