Motor assembly and surface cleaning device

Abstract

A motor assembly includes a drive device, a first frame, a second frame, a second gas flow passage at least a portion of which passes through at least a portion of the drive device and at least a portion of which is formed between the first and second frames, an outlet of the second gas flow passage being in close proximity to an inlet of the first gas flow passage, and an impeller assembly driven by the drive device to force gas flow within the first and second gas flow passages by rotation of the impeller assembly. A surface cleaning device is also provided.

Description

TECHNICAL FIELD

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

[0002] With the increasing demand for product performance-to-price ratio from the public, the power density of electric machines is also increasingly high, so the cooling of electric machines is increasingly demanding.

[0003] In the prior art, the electric machine is generally cooled by gas passing through the heating elements of the electric machine, but in order to realize the flow of gas through the interior of the electric machine, a complex structure generally needs to be designed, which results in more parts of the electric machine and higher cost.

[0004] Chinese utility model patent CN216907776U discloses a dry-wet dual-purpose suction device, which has a first gas flow passage and a second gas flow passage, and cools the electric machine by gas in the second gas flow passage.

[0005] Chinese utility model patents CN214511025U, CN213185788U and CN113258721A all have similar principles, but the structures for cooling in these prior arts use more parts, have higher cost, occupy space, and need to meet the requirements of vibration reduction and noise reduction, especially for the miniaturization trend of surface cleaning devices, the space utilization of key parts is very high. SUMMARY

[0006] To solve one of the above technical problems, the present disclosure provides a motor assembly and a surface cleaning device.

[0007] According to one aspect of the present disclosure, a motor assembly is provided, comprising:

[0008] a driving device for generating a driving force;

[0009] a first frame at least partially surrounding the driving device and defining a first gas flow passage through the first frame, wherein an inlet of the first gas flow passage is located at a lower end of the first frame;

[0010] a second frame at least partially surrounding the first frame and being configured to be detachably connected to the first frame, wherein the second frame is made of a damping material.

[0011] a second gas flow passage, at least a portion of the second gas flow passage passing through at least a portion of the driving device, and at least a portion of the second gas flow passage being formed between the first frame and the second frame, an outlet of the second gas flow passage being in close proximity to an inlet of the first gas flow passage; and

[0012] an impeller assembly, the driving device driving the impeller assembly to rotate to force the gas in the first gas flow passage and the second gas flow passage to flow by rotation of the impeller assembly.

[0013] According to at least one embodiment of the present disclosure, the first frame includes a lower housing, an outer wall surface of the lower housing being provided with at least one longitudinal groove, and a portion of the second gas flow passage being formed through the longitudinal groove.

[0014] According to at least one embodiment of the present disclosure, an inner wall surface of the second frame is formed with at least one longitudinal groove, and a portion of the second gas flow passage is formed through the longitudinal groove.

[0015] According to at least one embodiment of the present disclosure, the second frame is shaped to match a space of a position where the motor assembly is to be installed.

[0016] According to at least one embodiment of the present disclosure, an inner wall surface of the second frame is formed with an annular groove, and the first frame is sealingly fitted with the annular groove of the second frame.

[0017] According to at least one embodiment of the present disclosure, the first frame further includes:

[0018] a wind guide portion fixed to the lower housing, and an outer peripheral surface of the wind guide portion being formed with an annular protrusion fitted with the annular groove.

[0019] According to at least one embodiment of the present disclosure, the wind guide portion is formed with a through hole formed as a portion of the second gas flow passage.

[0020] According to at least one embodiment of the present disclosure, the through hole is in communication with the longitudinal groove of the first frame and / or the second frame.

[0021] According to at least one embodiment of the present disclosure, the first frame further includes:

[0022] The upper housing is formed with a space for accommodating the stator and rotor of the driving device, wherein the upper housing is formed with a ventilation hole which communicates with the through hole and forms an internal space of the upper housing as a part of the second gas flow passage.

[0023] According to at least one embodiment of the present disclosure, the motor assembly, the impeller assembly includes a gas inlet and a gas outlet, and a sealing member is arranged between the lower housing of the first frame and the gas inlet of the impeller assembly.

[0024] According to at least one embodiment of the present disclosure, the motor assembly, the impeller assembly is driven to rotate around a rotation axis; and includes:

[0025] The first wheel plate and the second wheel plate each have a circular outer contour, the circular contour of the second wheel plate has a smaller diameter than the first wheel plate, and the central axes of the first wheel plate and the second wheel plate are substantially coaxial; wherein the first wheel plate has a gas inlet, and

[0026] A plurality of blades are connected between the first wheel plate and the second wheel plate, wherein a gas passage is formed between two adjacent blades, the gas passage includes an air inlet and an air outlet, the air inlet communicates with the gas inlet; the second wheel plate is configured to provide a defect portion at the air outlet formed by at least two adjacent blades in the circumferential direction, so as to increase the air outlet area of the air outlet;

[0027] The defect portion includes a first curvature, and the blade includes a second curvature, and at the air outlet, the first curvature is substantially consistent with the second curvature.

[0028] According to at least one embodiment of the present disclosure, the defect portion includes a first portion and a second portion, and the connection between the first portion and the second portion is formed as a smooth connection.

[0029] According to at least one embodiment of the present disclosure, the first portion is formed as a first arc portion, and the second portion is formed as a second arc portion, and the curvature of the first arc portion is greater than the curvature of the second arc portion.

[0030] According to at least one embodiment of the present disclosure, the curvature of the first arc portion is 1.5-2 times the curvature of the second arc portion.

[0031] According to at least one embodiment of the present disclosure, the blade has a blade curvature, and the blade curvature is substantially consistent with the curvature of the first arc portion.

[0032] According to the motor assembly of at least one embodiment of the present disclosure, the first arcuate portion is an outwardly convex arc, and the second arcuate portion is an inwardly concave arc.

[0033] According to the motor assembly of at least one embodiment of the present disclosure, the blade has a free end distal to the rotation axis, and a projection of the free end on the second wheel plate is located on or within an outer circumferential circle of the second wheel plate.

[0034] According to the motor assembly of at least one embodiment of the present disclosure, the air inlet is located at a position of the first wheel plate close to the rotation axis.

[0035] According to the motor assembly of at least one embodiment of the present disclosure, the plurality of blades are uniformly distributed along a circumferential direction of the rotation axis.

[0036] According to another aspect of the present disclosure, there is provided a surface cleaning apparatus including the above-described motor assembly. BRIEF DESCRIPTION OF DRAWINGS

[0037] The accompanying drawings, which are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure.

[0038] Figure 1 is a structural diagram of a motor assembly according to one embodiment of the present disclosure.

[0039] Figure 2 is a structural diagram of a first gas flow passage and a second gas flow passage of a motor assembly according to one embodiment of the present disclosure.

[0040] Figure 3 is a structural diagram of an upper housing according to one embodiment of the present disclosure.

[0041] Figure 4 is a structural diagram of a bracket portion according to one embodiment of the present disclosure.

[0042] Figure 5 is a structural diagram of a lower housing according to one embodiment of the present disclosure.

[0043] Figure 6 is a structural diagram of an air guide portion according to one embodiment of the present disclosure.

[0044] Figure 7 is a structural diagram of a cover member according to one embodiment of the present disclosure.

[0045] Figure 8is a structural schematic view of a second frame according to one embodiment of the present disclosure.

[0046] Figure 9 is a structural schematic view of an impeller assembly according to one embodiment of the present disclosure.

[0047] Figure 10 is a structural schematic view of a blade according to one embodiment of the present disclosure.

[0048] Figure 11 is a structural schematic view of a second wheel plate according to one embodiment of the present disclosure.

[0049] Figure 12 is a plan view of an impeller assembly according to one embodiment of the present disclosure.

[0050] Figure 13 is an intake effect view of an impeller assembly according to one embodiment of the present disclosure.

[0051] Figure 14 is a dimensional schematic view of a second wheel plate according to one embodiment of the present disclosure.

[0052] Figure 15 is a structural schematic view of a motor assembly according to one embodiment of the present disclosure;

[0053] Figure 16 is Figure 15 an enlarged schematic view of A portion of

[0054] Figure 17 is Figure 15 an enlarged schematic view of B portion of

[0055] Figure 18 is a structural schematic view of a waterproof and breathable film according to one embodiment of the present disclosure.

[0056] Figure 19 is a structural schematic view of a gas guide portion according to one embodiment of the present disclosure.

[0057] The reference numerals in the drawings are specifically as follows:

[0058] 10 motor assembly

[0059] 100 drive device

[0060] 101 rotation shaft

[0061] 102 support portion

[0062] 200 first frame

[0063] 210 lower housing

[0064] 211 longitudinal groove

[0065] 220 air guide portion

[0066] 221 annular protrusion

[0067] 222 through hole

[0068] 230 upper housing

[0069] 231 vent hole

[0070] 232 accommodating groove

[0071] 240 glue storage groove

[0072] 300 second frame

[0073] 310 annular groove

[0074] 400 impeller assembly

[0075] 410 first wheel plate

[0076] 420 second wheel plate

[0077] 430 blade

[0078] 440 incomplete portion

[0079] 441 first part

[0080] 442 second part

[0081] 500 first gas flow channel

[0082] 600 second gas flow channel

[0083] 700 cover member

[0084] 800 sealing member

[0085] 900 waterproof and air-permeable membrane

[0086] 950 gas guide portion DETAILED DESCRIPTION

[0087] The present disclosure will be described in further detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related content, and not to limit the present disclosure. In addition, it should be noted that only parts related to the present disclosure are shown in the drawings for ease of description.

[0088] It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict. The technical solutions of the present disclosure will be described in detail below with reference to the drawings and in combination with the embodiments.

[0089] Unless otherwise stated, the exemplary implementations / examples shown will be understood to provide exemplary features of various details that can be implemented in practice to embody the technological concepts of the present disclosure. Accordingly, features of the various implementations / examples can additionally be combined, separated, interchanged, and / or rearranged, unless otherwise stated, without departing from the technological concepts of the present disclosure.

[0090] The use of cross-hatching and / or shading in the drawings is generally used to indicate different regions within the same component and is not intended to indicate specific materials, material properties, dimensions, ratios, etc. Moreover, the use of same reference numerals in different figures indicates similar and / or identical components within the figures. Additionally, the dimensions and relative dimensions of the various regions shown in the figures can be exaggerated or

[0091] When a component is referred to as being “on” or “over” another component, “connected to” or “coupled to” another component, it can be directly on, connected, or coupled to the other component, or intervening components can be present. However, when a component is referred to as being “directly on,” “directly connected to,” or “directly coupled to” another component, there are no intervening components present. By the term “connected” is meant to include physical or electrical connections, with or without intervening components.

[0092] For descriptive purposes, the present disclosure can use spatial or relative terms, such as “below,” “lower,” “below,” “low,” “above,” “upper,” “on,” “over,” “higher,” and “side” (e.g., as in “side wall”), which are intended to be interpreted in accordance with the orientation of the figure in which the device is depicted. Unless otherwise stated, the spatial and / or relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the exemplary term “below” can encompass both an orientation of above and below. Moreover, the device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0093] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, to the extent that the terms "comprising," "including," "containing," and / or "having" and variations thereof are used herein, such terms are intended to be inclusive, in an aspect, it is noted that the terms "substantial," "approximately," and other similar terms are used as terms of approximation and not as terms of degree, unless otherwise indicated herein, as such, they are used to account for inherent deviations in measurements, calculations, and / or provided values that would be recognized by those of ordinary skill in the art.

[0094] Figure 1 is a structural schematic diagram of a motor assembly 10 according to an embodiment of the present disclosure. Figure 2 is a structural schematic diagram of a first gas flow passage and a second gas flow passage of a motor assembly according to an embodiment of the present disclosure.

[0095] As shown in Figure 1 and Figure 2 , the motor assembly 10 of the present disclosure can include components such as a driving device 100, a first frame 200, a second frame 300, and an impeller assembly 400.

[0096] The driving device 100 is configured to generate a driving force. In one embodiment, the driving device 100 can be an electric motor, such as a direct current motor. In this case, the driving device 100 can include components such as a stator, a rotor, and a rotating shaft 101. The stator can be fixed to an upper housing 230, and the rotor can be disposed on the rotating shaft 101. One of the stator and the rotor can be energized, thereby causing the rotating shaft 101 to rotate.

[0097] Figure 3 is a structural schematic diagram of an upper housing according to an embodiment of the present disclosure.

[0098] As shown in Figure 3 , the upper housing 230 can be cup-shaped with an open upper end and a closed lower end. The lower end of the rotating shaft 101 can pass through the upper housing 230 and be disposed below the upper housing 230, and the rotating shaft 101 can be rotatably supported by the upper housing 230. On the other hand, the interior of the upper housing 230 can be provided with a bracket portion 102, and the upper end of the rotating shaft 101 can be rotatably disposed in the bracket portion 102, thereby fixing the axial position of the rotating shaft 101.

[0099] Figure 4 is a structural schematic view of a bracket portion according to one embodiment of the present disclosure.

[0100] In one preferred aspect, as shown in Figure 4 , the bracket portion 102 has a hollow structure to meet the gas flow requirement.

[0101] As shown in Figure 1 and Figure 2 , the first frame 200 is arranged at least partially around the driving device 100, and a first gas flow passage 500 is defined by the first frame 200, wherein the inlet of the first gas flow passage 500 is located at the lower end of the first frame 200; that is, the first gas flow passage 500 is formed as a suction passage, so that the motor assembly 10 forms a suction device. More preferably, the outlet of the first gas flow passage 500 is located at the middle of the first frame 200, whereby when the impeller assembly 400 rotates, gas can be sucked from the inlet of the first gas flow passage 500 and discharged from the outlet of the first gas flow passage 500 via the impeller assembly 400, at this time, the gas on the upstream side of the impeller assembly 400 forms a negative pressure state along the gas flow direction in the first gas flow passage 500.

[0102] As shown in Figure 1 and Figure 2 , the second frame 300 is arranged at least partially around the first frame 200, and the second frame 300 is composed of a damping material and is configured to be detachably connected to the first frame 200. In one preferred embodiment, the shape of the second frame 300 matches the space of the installation position of the motor assembly 10, whereby different models of products and different installation positions can be matched by changing the shape of the second frame 300.

[0103] That is, the second frame 300 of the present disclosure is formed in a replaceable form, and at the same time, the second frame 300 forms a cooling air duct and also has a damping function.

[0104] The present disclosure simultaneously realizes the formation of a cooling air duct and damping by a replaceable outer frame.

[0105] In one specific embodiment, the lower end of the second frame 300 can support the first frame 200, that is, when the second frame 300 is installed on other components, the first frame 200 can also be fixed at the same time.

[0106] At this time, the lower end of the second frame 300 is in an open shape, and gas can enter the first gas flow passage 500 through the lower end of the second frame 300.

[0107] As shown in FIG. 1, the motor assembly 10 of the present disclosure comprises a first gas flow passage 500, which can also be referred to as a gas flow passage for the first gas flow passage 500. In other words, when the motor assembly 10 is in operation, the first gas flow passage 500 is internally filled with gas, and the gas flowing in the first gas flow passage 500 can flow through the stator and the rotor of the driving device 100, thereby cooling the stator and the rotor of the driving device 100. Further, the gas flowing in the first gas flow passage 500 can flow through the components of the driving device 100 that generate a large amount of heat, such as the motor controller, thereby cooling these components. Figure 2 As shown in FIG. 1, the motor assembly 10 of the present disclosure comprises a second gas flow passage 600, which can also be referred to as a cooling passage. In other words, when the motor assembly 10 is in operation, the second gas flow passage 600 is internally filled with gas, and the gas flowing in the second gas flow passage 600 can flow through the stator and the rotor of the driving device 100, thereby cooling the stator and the rotor of the driving device 100. Further, the gas flowing in the second gas flow passage 600 can flow through the components of the driving device 100 that generate a large amount of heat, such as the motor controller, thereby cooling these components.

[0108] In one embodiment, at least a portion of the second gas flow passage 600 passes through at least a portion of the driving device 100, and at least a portion of the second gas flow passage 600 is formed between the first frame 200 and the second frame 300. The outlet of the second gas flow passage 600 is located adjacent to the inlet of the first gas flow passage 500, so that the gas in the second gas flow passage 600 can be sucked by the negative pressure at the inlet of the first gas flow passage 500, and the gas in the second gas flow passage 600 can enter the first gas flow passage 500.

[0109] Structurally, the outlet of the second gas flow passage 600 is located on the upstream side (in the direction of the gas flow in the first gas flow passage 500) of the impeller assembly 400, i.e. between the impeller assembly 400 and the first gas flow passage 500. The driving device 100 drives the impeller assembly 400 to rotate, so that the gas in the first gas flow passage 500 and the second gas flow passage 600 is forced to flow by the rotation of the impeller assembly 400.

[0110] Figure 5 is a structural schematic view of a lower housing according to an embodiment of the present disclosure.

[0111] In one embodiment, as shown in FIG. 1, the motor assembly 10 of the present disclosure comprises a first gas flow passage 500, which can also be referred to as a gas flow passage for the first gas flow passage 500. In other words, when the motor assembly 10 is in operation, the first gas flow passage 500 is internally filled with gas, and the gas flowing in the first gas flow passage 500 can flow through the stator and the rotor of the driving device 100, thereby cooling the stator and the rotor of the driving device 100. Further, the gas flowing in the first gas flow passage 500 can flow through the components of the driving device 100 that generate a large amount of heat, such as the motor controller, thereby cooling these components. Figure 1 and Figure 5As shown, the first frame 200 includes a lower housing 210, which can also be referred to as a shroud, and the outer wall surface (peripheral surface) of the lower housing 210 is provided with at least one longitudinal groove 211, and the longitudinal groove 211 forms a part of the second gas flow passage 600. More specifically, when the second frame 300 is mounted to the first frame 200, i.e., when the first frame 200 and the second frame 300 are fixed, the lengthwise opening of the longitudinal groove 211 is closed by the inner surface of the second frame 300, and thus the longitudinal groove 211 and the inner surface of the first frame 200 together form a cooling air duct. In a preferred embodiment, as shown in Figure 5 The number of longitudinal grooves 211 is three, and the three longitudinal grooves 211 are uniformly distributed along the circumference of the outer wall surface of the lower housing 210.

[0112] In another embodiment, the inner wall surface (peripheral surface) of the second frame 300 is formed with at least one longitudinal groove (not shown in the figure), and the longitudinal groove forms a part of the second gas flow passage 600; that is, the longitudinal groove can be formed in the lower housing 210, or can be formed in the second frame 300, or can be formed in both the lower housing 210 and the second frame 300.

[0113] Figure 6 is a structural schematic diagram of an air guide portion according to an embodiment of the present disclosure.

[0114] As shown in Figure 1 and Figure 6 The inner wall surface of the second frame 300 is formed with an annular groove 310, and the first frame 200 and the annular groove 310 of the second frame 300 are sealingly fitted. Specifically, the first frame 200 further includes an air guide portion 220, which is fixed to the lower housing 210, for example, is fixed to the upper end of the lower housing 210, and the peripheral surface of the air guide portion 220 is formed with an annular protrusion 221 that cooperates with the annular groove 310, so that the first frame 200 and the second frame 300 are sealingly connected by mounting the annular protrusion 221 in the annular groove 310.

[0115] In the present disclosure, the air guide part 220 is formed with a through hole 222 which is formed as part of the second gas flow channel 600; more preferably, the through hole 222 is in communication with the longitudinal groove of the first frame 200 and / or the second frame 300. In a specific embodiment, the through hole 222 can be a round hole with a diameter of about 3mm, and the number and diameter thereof can be set according to the power of the motor assembly and the working condition of the driving device, for example, the diameter of the through hole 222 can be in the range of 2-5mm, and the number thereof is set to 3 or 4.

[0116] More preferably, the upper housing 230 is formed with a ventilation hole 231 which is in communication with the through hole 222 and makes the internal space of the upper housing 230 part of the second gas flow channel 600; in a specific embodiment, the ventilation hole 231 of the upper housing 230 is located on the side wall of the upper housing 230 close to the lower end, so that the gas in the upper housing 230 flows through the stator and rotor of the motor as much as possible.

[0117] As an implementation form, as shown in Figure 3 The cross-sectional shape of the ventilation hole 231 can be a racetrack shape, of course, those skilled in the art should know that the cross-section of the ventilation hole 231 can be formed into a circular shape, a square shape or other shapes.

[0118] Figure 7 is a structural schematic diagram of a cover part according to an embodiment of the present disclosure.

[0119] In the present disclosure, as shown in Figure 7 The motor assembly 10 further comprises a cover part 700 which is arranged on the upper housing 230, and the cover part 700 is provided with a hole structure through which gas can enter the interior of the upper housing 230 to cool the driving device 100. More preferably, the control device is arranged in the space formed by the cover part 700 and the upper housing 230, and can be fixed to one of the cover part 700 or the upper housing 230; at this time, the gas entering through the cover part 700 can also cool the control device.

[0120] Figure 8 is a structural schematic diagram of a second frame 300 according to an embodiment of the present disclosure.

[0121] In the present disclosure, a groove is formed on the inner wall surface of the lower end of the second frame 300 to form a damping structure through the groove for damping the driving device 100.

[0122] Figure 9is a structural schematic diagram of an impeller assembly according to an embodiment of the present disclosure.

[0123] As shown in Figure 9 The impeller assembly 400 includes a gas inlet and a gas outlet, and a sealing member 800 is arranged between the lower housing 210 of the first frame 200 and the gas inlet of the impeller assembly 400.

[0124] The structure of the impeller assembly 400 will be described in detail below with reference to the accompanying drawings.

[0125] In the present disclosure, as shown in Figure 9 The impeller assembly 400 can include a first wheel plate 410, a second wheel plate 420, and a plurality of blades 430, etc.

[0126] The first wheel plate 410 and the second wheel plate 420 each have a circular outer contour or a substantially circular outer contour; in a preferred embodiment, the diameter of the circular contour of the second wheel plate 420 is smaller than that of the first wheel plate 410, thereby facilitating the guiding of the gas flow from downstream to upstream.

[0127] When the impeller assembly 400 is driven to rotate by the driving device 100, the impeller assembly 400 has an axis of rotation. The first wheel plate 410 and the second wheel plate 420 each have a central axis, and preferably, the central axis of the first wheel plate 410 is substantially coaxial with the central axis of the second wheel plate 420 and also coaxial with the axis of rotation.

[0128] The first wheel plate 410 is outwardly convex to form a convex portion, and the gas inlet is formed by the convex portion, and at this time, the convex portion can be in contact with the sealing member 800 to improve the efficiency of suction of the gas.

[0129] The second wheel plate 420 is fixed to the rotating shaft 101 of the driving device 100, so that the impeller assembly 400 as a whole is fixed to the driving device 100, and so that the impeller assembly 400 can be driven to rotate by the driving device 100.

[0130] Figure 10 is a structural schematic diagram of a blade according to an embodiment of the present disclosure.

[0131] As shown in Figure 10As shown, the plurality of blades 430 are connected between the first wheel plate 410 and the second wheel plate 420, thereby forming the impeller assembly 400 as a whole. In one embodiment, a gas passage is formed between two adjacent blades 430, the gas passage comprising an air inlet and an air outlet, the air inlet being in communication with the gas inlet; the second wheel plate 420 is configured to provide a defect 440 at the air outlet formed by at least two adjacent blades 430 in the circumferential direction, so as to increase the air outlet area of the air outlet.

[0132] The defect 440 comprises a first curvature, and the blade 430 comprises a second curvature, at the air outlet, the first curvature is substantially consistent with the second curvature, thereby being able to reduce vibration and reduce noise.

[0133] Figure 11 is a structural schematic diagram of a second wheel plate according to one embodiment of the present disclosure.

[0134] In a preferred embodiment, as shown, Figure 11 The defect 440 comprises a first portion 441 and a second portion 442, and the connection between the first portion 441 and the second portion 442 is formed as a smooth connection.

[0135] In one embodiment, the first portion 441 can be formed as a first arc portion, and the second portion 442 can be formed as a second arc portion; the first arc portion and the second arc portion are tangent to each other, thereby forming the first portion 441 and the second portion 442 as a smooth connection. Preferably, the curvature of the first arc portion is greater than the curvature of the second arc portion. In the present disclosure, the first arc portion is an outward convex arc, for example, an outward convex circular arc; and the second arc portion is an inward concave arc, for example, an inward concave circular arc.

[0136] Those skilled in the art should know that the first portion 441 and the second portion 442 can be formed as a straight line or a curve, etc., thereby forming the defect 440 into a predetermined shape.

[0137] Figure 14 is a size schematic diagram of a second wheel plate according to one embodiment of the present disclosure.

[0138] In a preferred embodiment, as shown, Figure 14 The curvature of the first arc portion is 1.5-2 times the curvature of the second arc portion; for example, the radius of the first arc portion is 10 cm; the radius of the second arc portion is 5.5 cm, and the maximum inscribed circle diameter of the second wheel plate 420 is 33 cm.

[0139] In the present disclosure, the vane 430 has a vane curvature which is substantially consistent with the curvature of the first arc section, for example, the vane curvature of the vane 430 near the first arc section is the same or substantially the same as the curvature of the first arc section.

[0140] The vane 430 has a free end away from the rotation axis, and the projection of the free end on the second wheel plate 420 is located on or within the outer circle circumference of the second wheel plate 420.

[0141] The plurality of vanes 430 are evenly distributed along the circumferential direction of the rotation axis, so that the gas passages between two adjacent vanes 430 are substantially the same, and the gas inlets are evenly distributed in the circumferential direction. More preferably, the gas inlets are located near the rotation axis of the first wheel plate 410. The vane 430 of the gas outlet extends to the outside of the second wheel plate 420 to change the flow direction of the outflowing gas through the vane 430, further improving the gas exhaust efficiency.

[0142] Figure 15 is a structural schematic diagram of a motor assembly according to an embodiment of the present disclosure; Figure 16 is Figure 15 is an enlarged schematic diagram of part A of

[0143] In the present disclosure, the lower housing 210 is arranged at least partially around the driving device, for example, the lower housing 210 can partially surround the lower end of the driving device 100. Of course, those skilled in the art should know that the lower housing 210 can also not surround the driving device, at this time, only the upper housing 230 is arranged around the driving device 100.

[0144] Considering that there can be liquid in the environment where the motor assembly is used, at this time, when the motor assembly is stopped, the liquid can be sucked to the motor of the motor assembly, for example, through the second gas flow passage, the liquid is sucked to the rotor and stator of the motor. In order to solve this problem, the shape of the air hole 231 of the upper housing 230 can be specially designed, for example, along the gas flow direction in the second gas flow passage, the area of the inlet of the air hole 231 (the inner wall surface of the upper housing 230) is smaller than the area of the outlet of the air hole 231 (the outer wall surface of the upper housing 230).

[0145] At this time, a waterproof and breathable film 900 can be arranged at the position of the air hole 231, in the present disclosure, the waterproof and breathable film 900 is located at the outlet of the air hole 231 and longitudinally between the impeller assembly 400 and the driving device 100.

[0146] More preferably, the upper shell 230 is formed with a receiving groove 232, and the air vent hole is formed in the bottom wall of the receiving groove 232, wherein the waterproof and air-permeable film 900 is arranged in the receiving groove 232.

[0147] In a preferred embodiment, the depth of the receiving groove 232 is greater than or equal to the thickness of the waterproof and air-permeable film 900, so that the waterproof and air-permeable film 900 does not protrude from the upper shell 230; in the present disclosure, the waterproof and air-permeable film 900 can be adhered to the upper shell 230 by adhesive, of course, those skilled in the art should know that it can also be fixed on the upper shell 230 by other means.

[0148] In the present disclosure, the motor assembly 10 further comprises a gas guide portion 950, which is fixed to the upper shell 230 and located below the upper shell 230 and the air guide portion 220.

[0149] In order to prevent the rotation of the gas guide portion 950 and to position the gas guide portion 950, one of the upper shell 230 and the gas guide portion 950 is provided with a circumferential positioning protrusion, which is a protrusion arranged in the axial direction of the upper shell 230 or the gas guide portion 950; the other one of the upper shell 230 and the gas guide portion 950 is provided with a circumferential positioning groove, and the circumferential positioning protrusion cooperates with the circumferential positioning groove, so that the upper shell 230 and the gas guide portion 950 do not rotate relative to each other.

[0150] Similarly, one of the upper shell 230 and the gas guide portion 950 is provided with an axial positioning protrusion, and the other one is provided with an axial positioning groove, and the axial positioning protrusion cooperates with the axial positioning groove, so that the upper shell 230 and the gas guide portion 950 do not axially move relative to each other.

[0151] In an embodiment, the gas guide portion 950 can be in sealing contact with the air guide portion 220, for example, the gas guide portion 950 can be designed to be in interference fit with the air guide portion 220, so that the position of the gas guide portion 950 is fixed and in sealing contact with the air guide portion 220.

[0152] In the present disclosure, a glue storage groove 240 is formed between the air guide portion 220 and the upper shell 230, and glue is filled in the glue storage groove 240, so that the air guide portion 220 and the upper shell 230 have better sealing effect; more preferably, a glue storage groove can also be formed between the gas guide portion 950 and the upper shell 230.

[0153] As a specific implementation form, the glue storage groove can be an annular groove and is formed by an annular groove formed on the inner wall surface of the air guide portion 220 and / or the outer wall surface of the upper housing 230; accordingly, the glue storage groove between the gas guide portion 950 and the upper housing 230 can be formed by an annular groove formed on the inner wall surface of the gas guide portion 950 and / or the outer wall surface of the upper housing 230.

[0154] According to another aspect of the present disclosure, there is provided a surface cleaning apparatus including the above-described motor assembly.

[0155] In the description of the specification, the description of the terms "one embodiment / way", "some embodiments / ways", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / way or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments / ways or examples. In addition, the person skilled in the art can combine and combine the different embodiments / ways or examples described in the present specification and the features of the different embodiments / ways or examples, without contradiction.

[0156] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0157] Those skilled in the art should understand that the above-mentioned embodiments are only for clearly illustrating the present disclosure, and are not intended to limit the scope of the present disclosure. Based on the above disclosure, other changes or modifications can also be made by those skilled in the art, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A motor assembly, characterized in that, include: A driving device for generating driving force; A first frame is disposed at least partially around the drive device and defines a first gas flow channel, wherein the inlet of the first gas flow channel is located at the lower end of the first frame. A second frame, which at least partially surrounds the first frame and is made of shock-absorbing material, is configured to be detachably connected to the first frame; an annular groove is formed on the inner wall surface of the second frame, and the first frame and the annular groove of the second frame are sealed together; the first frame further includes: an air guide portion, which is fixed to the lower housing, and an annular protrusion is formed on the outer peripheral surface of the air guide portion to cooperate with the annular groove; A second gas flow channel, at least a portion of which passes through at least a portion of the drive device, and at least a portion of which is formed between the first frame and the second frame, wherein the outlet of the second gas flow channel is adjacent to the inlet of the first gas flow channel; and Impeller assembly, the driving device drives the impeller assembly to rotate, so as to force the gas flow in the first gas flow channel and the second gas flow channel through the rotation of the impeller assembly; The air guide section has a through hole, which is part of the second gas flow channel; the through hole communicates with the longitudinal grooves of the first frame and the second frame. The first frame further includes an upper housing, which forms a space for accommodating the stator and rotor of the drive device. The upper housing has a vent hole that communicates with the through hole, and the internal space of the upper housing forms part of a second gas flow channel. The impeller assembly includes a gas inlet and a gas outlet, and a sealing component is provided between the lower housing of the first frame and the gas inlet of the impeller assembly; the impeller assembly can be driven to rotate about a rotation axis; the impeller assembly includes a first wheel plate, a second wheel plate, and a plurality of blades, the first wheel plate and the second wheel plate both having a circular outer contour, the diameter of the circular contour of the second wheel plate being smaller than that of the first wheel plate, and the central axes of the first wheel plate and the second wheel plate being substantially coaxial; wherein, the first wheel plate has a gas inlet, the plurality of blades are connected between the first wheel plate and the second wheel plate, wherein a gas channel is formed between two adjacent blades, the gas channel including an air inlet and an air outlet, the air inlet communicating with the gas inlet; the second wheel plate is configured to: provide a notch along the circumferential direction at the air outlet formed by at least two adjacent blades to increase the air outlet area of ​​the air outlet; wherein, the notch includes a first curvature, and the blade includes a second curvature. The curvature at the exhaust port is such that the first curvature and the second curvature are substantially the same; the defect includes a first part and a second part, and the connection between the first part and the second part is formed as a smooth connection; the first part is formed as a first arc portion, and the second part is formed as a second arc portion, the curvature of the first arc portion is greater than the curvature of the second arc portion; the curvature of the first arc portion is 1.5-2 times the curvature of the second arc portion; the blade has a blade curvature, and the blade curvature is substantially the same as the curvature of the first arc portion; the first arc portion is an outwardly convex arc, and the second arc portion is an inwardly concave arc; the blade has a free end away from the axis of rotation, and the projection of the free end on the second wheel plate is located on or within the outer circumference of the second wheel plate; the air inlet is located on the first wheel plate near the axis of rotation; the plurality of blades are evenly distributed circumferentially along the axis of rotation.

2. The motor assembly as claimed in claim 1, characterized in that, The first frame includes a lower housing, the outer wall of which is provided with at least one longitudinal groove, and the longitudinal groove forms part of the second gas flow channel.

3. The motor assembly as claimed in claim 1, characterized in that, At least one longitudinal groove is formed on the inner wall surface of the second frame, and a portion of the second gas flow channel is formed through the longitudinal groove.

4. The motor assembly as claimed in claim 1, characterized in that, The shape of the second frame matches the space of the motor assembly to be installed.

5. A surface cleaning device, characterized in that, The motor assembly includes any one of claims 1-4.

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