CN112688471A

CN112688471A - Motor and cleaning device

Info

Publication number: CN112688471A
Application number: CN202011614035.6A
Authority: CN
Inventors: 曹非; 王云彬; 周春锋; 马宗到; 陈振
Original assignee: Suzhou Kaihang Electromotor Co ltd; Tineco Intelligent Technology Co Ltd
Current assignee: Suzhou Kaihang Electromotor Co ltd; Tineco Intelligent Technology Co Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-04-20
Also published as: WO2022142998A1

Abstract

The application discloses a motor, which at least comprises a closed shell, a stator, a rotor and a driving shaft, wherein the stator, the rotor and the driving shaft are positioned in the shell; the casing is at least partially oriented toward the heat dissipation assembly along a first direction, and the diameter of the casing is gradually reduced along the first direction. The technical scheme that this application provided can satisfy the waterproof and cooling demand of motor.

Description

Motor and cleaning device

Technical Field

The application relates to the field of cleaning equipment, in particular to a motor and cleaning equipment.

Background

With the improvement of living standard of people, more and more families begin to reduce labor and improve life quality by means of various cleaning devices.

The existing cleaning equipment usually takes the motor as a power source and is limited by the use scene of the cleaning equipment, the cleaning equipment is often contacted with liquid, and the motor can work for a long time, so that the cleaning equipment is often failed due to water inflow of the motor or over-high temperature rise of the motor.

Disclosure of Invention

The application aims to provide a motor and cleaning equipment, which can meet the waterproof and cooling requirements of the motor.

In order to achieve the above object, an aspect of the present application provides an electric motor, which includes at least a sealed casing, and a stator, a rotor, and a driving shaft inside the casing, and further includes a heat dissipation assembly; the casing is at least partially oriented toward the heat dissipation assembly along a first direction, and the diameter of the casing is gradually reduced along the first direction.

In order to achieve the above object, in another aspect, the present application further provides a cleaning device, the cleaning device at least includes a body and a motor disposed inside the body, the motor at least includes a sealed casing, and a stator, a rotor and a driving shaft located inside the casing, the motor further includes a heat dissipation assembly; the casing is at least partially oriented toward the heat dissipation assembly along a first direction, and the diameter of the casing is gradually reduced along the first direction.

Therefore, the scheme provided by the application is that the stator, the rotor, the driving shaft and other components in the motor are placed in a closed shell, and when the motor works, the heat generated by the stator, the rotor and other components can be conducted to the shell. Simultaneously, be provided with radiator unit in the outside of casing to above-mentioned radiator unit is connected with the output of drive shaft, like this, when motor during operation, above-mentioned drive shaft can drive the movable vane rotation among the radiator unit, and rotatory movable vane can blow outside air to the surface of casing, and the air of rapid flow can take away the heat on the casing, thereby dispels the heat to the casing by force, guarantees that the temperature rise of motor is unlikely to too big. On the other hand, because the shell of the motor has a good closed structure, the internal space of the motor can be completely isolated from the external environment, so that liquid in the external environment cannot enter the motor, and the problem that the motor fails due to water inflow is solved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a perspective view of an electric motor in one embodiment provided herein;

FIG. 2 is an exploded perspective view of the motor of FIG. 1;

FIG. 3 is a longitudinal cross-sectional view of the motor of FIG. 1;

FIG. 4 is an enlarged partial schematic view of area A of FIG. 3;

FIG. 5 is an enlarged partial schematic view of region B of FIG. 3;

FIG. 6 is a longitudinal sectional view of a motor in another embodiment provided herein;

FIG. 7 is a longitudinal sectional view of a motor in another embodiment provided herein;

fig. 8 is a partially enlarged schematic view of the region C in fig. 7.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings. Terms such as "upper," "above," "lower," "below," "first end," "second end," "one end," "another end," and the like, used herein to denote relative spatial positions, are used for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation 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. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Furthermore, the terms "mounted", "disposed", "provided", "connected", "slidably connected", "fixed" and "sleeved" are to be understood in a broad sense. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

With the development of social productivity, the living standard of people is also improved. On the premise that the material basis is guaranteed, people begin to reduce labor and improve life quality by means of various cleaning devices. The existing cleaning equipment usually uses an electric motor as a power source, and the electric motor mainly comprises a stator, a rotor and accessories in structure.

The stator is a static part of the motor and generally comprises a base, a stator iron core and a stator winding, wherein the stator iron 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 iron core and used for embedding the stator winding; the stator winding is generally formed by connecting three windings which are separated by 120 degrees in space and have the same structure, and each coil of the windings is respectively embedded 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 caps to support the rotor, and to perform protection, heat dissipation, and the like.

The rotor is a rotating part of the motor and generally comprises a rotor iron core, a rotor winding, a driving shaft and other parts, wherein the rotor iron core is generally formed by punching and laminating silicon steel sheets, and holes which are uniformly distributed are punched on the outer circle of each silicon steel sheet and used for placing the rotor winding; the rotor winding is used for cutting the stator rotating magnetic field to generate induced electromotive force and current and forming electromagnetic torque to enable the motor to rotate; the drive shaft is used to transmit torque and support the weight of the rotor, and the rotor core is normally press-fitted directly onto the drive shaft.

The accessory generally includes an end cap for supporting, a bearing for connecting the rotating part and the stationary part, and a circuit part, wherein the circuit part generally includes power Control components such as a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) and a Micro Controller Unit (MCU), and the power Control components are generally mounted on a circuit board.

When the motor is operated, the stator, the rotor and the circuit part generate a large amount of heat, and the temperature rise of the motor is mainly generated by the heat. If the motor can work normally, the motor needs to be radiated, and meanwhile, the interior of the motor needs to be kept in a dry environment so as to prevent the stator, the rotor and a circuit part from being broken down. The existing motor heat dissipation scheme needs to communicate the inside of the motor with the external environment, then utilizes the heat dissipation fan blades to send air in the external environment into the inside of the motor, the inside air duct that is equipped with of the motor, and the external air enters along the air duct, thereby dispels the heat inside the motor. Because the motor is communicated with the external environment, devices inside the motor are susceptible to external moisture and lose efficacy, and the motor is prone to failure.

Therefore, how to satisfy the requirement of temperature rise of the motor and avoid water inflow of the motor becomes a problem to be solved urgently in the field.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. It should be apparent that the embodiments described in this application are only some embodiments of the present application, and not all embodiments of the present application. All other embodiments, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments in the present application, are within the scope of protection of the present application.

Please refer to fig. 1, fig. 2, fig. 3 and fig. 4 together. In the present embodiment, the motor 1 includes at least a sealed casing 12, and a stator 13, a rotor 14 and a driving shaft 11 located inside the casing 12, wherein the stator 13 is fixed to the casing 12, the rotor 14 is rotatably installed in the casing 12, and the driving shaft 11 is fixed to the rotor 14.

In an implementation, a top cap 1201 and a substantially cylindrical housing 1202 may be manufactured by die casting or casting, the top cap 1201 has a wire outlet 1211, the housing 1202 has an opening 1221, and the top cap 1201 and the housing 1202 may be combined into a substantially airtight container (i.e., a housing 12) by screws or slots, wherein external wires may be introduced into the housing 12 through the wire outlet 1211, and the power output end of the driving shaft 11 may pass through the opening 1221 and be partially exposed to the housing 12. In practical applications, a rubber sealing ring (not shown) may be disposed in the outlet 1211, and the inner diameter of the rubber sealing ring matches the diameter of the external electric wire, so that when the external electric wire is introduced into the casing 12, the rubber sealing ring and the external electric wire together block the outlet 1211, thereby sealing the outlet 1211. Accordingly, an oil seal (not shown) is provided between the drive shaft 11 and the opening 1221, and together with the drive shaft 11, the opening 1221 is blocked, thereby sealing the opening 1221. With the above arrangement, the casing 12 has a closed structure as a whole, and outside air and moisture hardly enter the inside of the casing 12.

In an implementable embodiment, the motor 1 is externally connected with the heat dissipating assembly 2, the casing 12 is at least partially oriented in a first direction towards the heat dissipating assembly 2, and the diameter of the casing 12 is gradually reduced in the first direction. It should be noted that the present application defines the first direction as the direction indicated by the arrow in fig. 3, and specifically, the first direction is directed from the outlet 1211 to the opening 1221. The heat dissipation assembly 2 may blow external air toward the outer surface of the cabinet 12 in a direction opposite to the first direction, thereby cooling the motor 1.

In an implementable embodiment, the motor 1 further comprises a thermally conductive support 15 and a circuit board 16, the thermally conductive support 15 being located inside the casing 12, and the thermally conductive support 15 being connected to an inner surface of the casing 12; the components on the circuit board 16 are disposed toward the heat conductive support 15 and attached to the heat conductive support 15, so that heat generated by the components is transferred to the chassis 12 through the heat conductive support 15. In practical applications, the heat conducting bracket 15 may be made of a metal material (e.g., aluminum, copper, iron, etc.) with good heat conductivity, and the outer edge of the heat conducting bracket 15 is at least partially in contact with the inner surface of the casing 12. The motor power control assembly (for example, electronic components such as an MOS (metal oxide semiconductor) tube and an MCU (micro control unit)) is completely arranged on one side of the circuit board 16, when the circuit board 16 is installed, one side of the circuit board 16 on which components are arranged faces the heat conduction support 15, and high-heat-conductivity silicone grease is coated on the surfaces of the MOS tube and the MCU, then the circuit board 16 is pressed and locked on the heat conduction support 15, thus, the MOS tube and the MCU are in contact with the heat conduction support 15 through the heat conduction silicone grease, the heat generated by the MOS tube and the MCU can be rapidly transferred to the heat conduction support 15 and transferred to the shell 12 through the heat conduction support 15, and the air flow blown to the outer surface of the shell 12 by the heat dissipation assembly 2 can take away the heat in the shell 12, through the heat transfer process, the heat generated by the MOS tube and the MCU is.

In an implementable embodiment, the casing 12 has a substantially cylindrical frame, and the heat-conducting support 15 is disposed perpendicularly to the axial direction of the frame and divides the frame into an upper chamber 121 and a lower chamber 122; the wiring board 16 is located in the upper cavity 121, the stator 13, the rotor 14 and the drive shaft 11 are located in the lower cavity 122, and the drive shaft 11 penetrates the lower cavity 122. Specifically, the heat conductive bracket 15 may be installed at a prescribed position inside the case 12 and fixed to the case 12 by screws, the heat conductive bracket 15 has a cross section substantially the same as that of the case 12 at the prescribed position, and the heat conductive bracket 15 has a thickness such that the heat conductive bracket 15 may divide the inside of the case 12 into two independent cavities (i.e., an upper cavity 121 and a lower cavity 122) when the heat conductive bracket 15 is installed at the prescribed position. The wire outlet 1211 is located at the top of the upper cavity 121, and the wires can be electrically connected to the electronic components on the circuit board 16 through the wire outlet 1211. The opening 1221 is located at the bottom of the lower cavity 122, and the power output end of the driving shaft 11 can pass through the opening 1221 and be partially exposed to the lower cavity 122.

Alternatively, the housing 12 may be made of a metal material (e.g., iron or aluminum) with good thermal conductivity. In order to increase the contact area between the heat conducting support 15 and the inner wall of the casing 12 and improve the heat dissipation effect, the outer edge of the heat conducting support 15 is turned outwards in the axial direction for a certain distance, and the heat conducting support 15 is fixed on the inner wall of the casing 12 through the turned-out outer edge. Further, the joint of the heat conducting support 15 and the casing 12 can be filled with heat conducting silicone grease with high heat conductivity coefficient, correspondingly, the joint of the stator 13 and the casing 12 can also be filled with heat conducting silicone grease with high heat conductivity coefficient, and the heat conducting silicone grease can efficiently transfer the heat generated by the heat conducting support 15 and the stator 13 to the casing 12, so that the effect of cooling the whole motor 1 is realized.

In one practical embodiment, as shown in fig. 3, the heat conducting bracket 15 may be attached to the chassis 12 as a separate component, i.e., the heat conducting bracket 15 and the chassis 12 are separately fabricated. Specifically, the top cap 1201 and the housing 1202 may be manufactured by die casting or casting, the top cap 1201 and the housing 1202 may be combined into a sealed container (i.e., the housing 12), and the heat conductive bracket 15 may be mounted on the housing 12. Accordingly, the assembling process of the motor 1 may be: the stator 13, the rotor 14, the driving shaft 11 and the like are first mounted in the housing 1202, then the heat conductive bracket 15 is mounted on the housing 1202, then the circuit board 16 is press-locked on the heat conductive bracket 15, and finally the top cap 1201 is combined with the housing 1202.

Alternatively, as shown in fig. 6, the heat conducting bracket 15 may be a part of the chassis 12, i.e. the top cover 1201, the bottom cover 1203, and the housing 1202 with the heat conducting bracket 15 are respectively die-cast or cast, and the top cover 1201, the bottom cover 1203, and the housing 1202 may be combined into a closed container (i.e. the chassis 12). Accordingly, the assembling process of the motor 1 may be: the stator 13, the rotor 14, the driving shaft 11 and other components are firstly installed in the housing 1202, then the bottom cover 1203 is combined with the housing 1202, then the circuit board 16 is pressed and locked on the heat conducting bracket 15, and finally the top cover 1201 is combined with the housing 1202.

In an implementable embodiment, the heat dissipating assembly 2 comprises a hood 21 and an impeller 22. The hood 21 has an air inlet 211, and the hood 21 covers the impeller 22, that is, the impeller 22 is completely located in the inner cavity of the hood 21. When the heat sink 2 is mounted on the motor 1, the lower cavity 122 is at least partially wrapped by the fan housing 21, that is, when the heat sink 2 and the motor 1 are combined together, the lower cavity 122 of the motor 1 is at least partially located in the inner cavity of the fan housing 21. Meanwhile, the diameter of the lower cavity 122 is smaller than that of the upper cavity 121, and the diameter of the wind shield 21 is smaller than or equal to that of the upper cavity 121. The movable impeller 22 is connected to the power output end of the drive shaft 11 through a coupling 221 so that the movable impeller 22 can be rotated by the drive shaft 11, and when the movable impeller 22 is rotated, the movable impeller 22 can introduce external air into the inside of the hood 21 through the air inlet 211.

In an achievable embodiment, the hood 21 has end plates 212 and side plates 213. The end plate 212 has a circular shape, and an opening is formed at a central position of the end plate 212 to form an air inlet 211, and external air may enter the inner cavity of the hood 21 through the air inlet 211. The side plate 213 surrounds the outer edge of the end plate 212, so as to form a cylindrical cavity with an open structure, which is an inner cavity of the wind shield 21. A support structure (not shown) is further disposed in the inner cavity of the fan housing 21, one end of the support structure is connected to the inner wall of the fan housing 21, and the other end of the support structure is connected to the outer surface of the motor 1, so that the fan housing 21 can be fixed to the motor 1, specifically, the support structure may be a spoke-type concentric ring, an outer ring of the concentric ring is connected to the inner wall of the fan housing 21, and an inner ring of the concentric ring is sleeved on the outer surface of the motor 1.

The movable impeller 22 is disposed axially inside the end plate 212, and the movable impeller 22 is connected to the power output end of the drive shaft 11 via the coupling 221 so that the movable impeller 22 can rotate synchronously with the drive shaft 11. The movable impeller 22 is configured to: when the movable impeller 22 rotates, the blades of the movable impeller 22 may suck external air into the internal cavity of the fan cover 21 from the air inlet 211, and blow the air entering the internal cavity of the fan cover 21 toward the outer surface of the casing 12 in a direction opposite to the first direction. The specific structure of the movable impeller 22 can refer to the prior art, and is not described herein.

In practical applications, the motor 1 needs to be provided with a waterproof sealing structure, and each joint of the casing 12 is usually sealed by an O-ring. Meanwhile, in order to prevent the motor from being out of work due to water entering from the screw hole positions, screw gaskets or hole plugs need to be added to the screw holes, buffering parts need to be arranged between the motor 1 and an external structural component (such as a motor support) to buffer and stop rotation, and the structures and the parts increase the manufacturing complexity of the motor 1.

In view of the above problem, in an implementation mode, please refer to fig. 1 and fig. 3 together, the motor 1 further includes a rubber coating member 3, and the rubber coating member 3 includes a plastic body 31 and a stop structure 32. The plastic body 31 matches the outer contour of the upper cavity 121 to wrap and seal the upper cavity 121; the stop structure 32 is located on the outer surface of the plastic body 31, and when the motor 1 is mounted on a motor mount (not shown), the stop structure 32 cooperates with the motor mount to prevent displacement of the motor 1. Specifically, the plastic-covered part 3 can be made of elastic resin or rubber materials such as artificial rubber, TPU, TPR, TPE, and soft PVC, the plastic body 31 is assembled on the upper cavity 121 from the top of the upper cavity 121, and water-inlet parts such as screw holes and seams on the upper cavity 121 are wrapped, so that water is prevented from entering the upper cavity 121.

In practical applications, in order to direct the airflow to the outer surface of the motor 1 to improve the cooling efficiency, in an implementable embodiment, the heat dissipation assembly 2 further includes a stationary impeller 23, and the stationary impeller 23 is located inside the fan housing 21 and is disposed behind the movable impeller 22. The fixed impeller 23 may be clamped on the outer surface of the motor 1, or the fixed impeller 23 may be fixed on the inner wall of the fan housing 21 by a mortise and tenon structure. The fixed impeller 23 is configured to: when the outside air is blown toward the fixed impeller 23 via the movable impeller 22, the blades of the fixed impeller 23 can guide the air to the outer surface of the motor 1 at a predetermined angle. The specific structure of the stator 23 can refer to the prior art, and is not described herein.

The fixed impeller 23 is directly connected to the motor 1 or the fan cover 21, and a special abutting member needs to be provided, and the mounting process is complicated. To simplify the installation of the stator vane wheel 23, in an implementable embodiment, the heat dissipating assembly 2 further includes a stator vane wheel bracket 24 and a wind guide portion 25. The fixed impeller bracket 24 is fixedly connected with the motor 1, the air guide part 25 is sleeved inside the fan cover 21, and an air flow gap is formed between the fixed impeller bracket 24 and the air guide part 25; the fixed impeller 23 is positioned in the airflow gap, one end of the fixed impeller 23 is connected to the fixed impeller bracket 24, and the other end of the fixed impeller 23 is connected to the air guide portion 25.

The stator impeller holder 24 has a disk-like structure with a hole at the center, and the stator impeller holder 24 can be fitted to the motor 1 through the hole, and the stator impeller holder 24 can be fixed to the motor 1 by screws. Furthermore, the opening has a plurality of concave positioning points, and the outer surface of the motor 1 is provided with a corresponding number of positioning columns, so that the fixed impeller bracket 24 can be accurately sleeved on the motor 1 by embedding the positioning columns into the concave positioning points.

The outer contour of the air guiding portion 25 is matched with the fan housing 21, and the diameter of the air guiding portion 25 is smaller than that of the fan housing 21, so that the air guiding portion 25 can be clamped in an inner cavity of the fan housing 21, and specifically, the air guiding portion 25 can be connected with the fan housing 21 through a thread or mortise and tenon structure. The diameter of the fixed impeller bracket 24 is smaller than the diameter of the air guide portion 25, and when the fixed impeller bracket 24 is fixed to the motor 1 and the air guide portion 25 is fixed to the fan housing 21, a certain distance (i.e., an air flow gap) is provided between the outer edge of the fixed impeller bracket 24 and the inner wall of the air guide portion 25, and an air flow can pass through the air flow gap. The fixed impeller 23 is located in the airflow gap, and two ends of the root of the fixed impeller 23 are respectively connected with the fixed impeller bracket 24 and the air guiding part 25, so that the air guiding part 25 can be fixed on the fixed impeller bracket 24, and the fixed impeller bracket 24 can support the air guiding part 25, thereby enabling the air guiding part 25 to have a more stable structure. It should be noted that the size of the air flow gap may be set according to the structure of the fixed impeller 23, for example, the size of the air flow gap may be set according to the deflection angle of the blades in the fixed impeller 23.

Optionally, the diameter of the air guiding portion 25 may also be larger than the diameter of the fan cover 21, and at this time, the fan cover 21 may be clamped inside the air guiding portion 25. Accordingly, the diameter of the fixed impeller bracket 24 needs to be smaller than the diameter of the fan housing 21, so that an airflow gap is formed between the fixed impeller bracket 24 and the fan housing 21, the fixed impeller 23 is located in the airflow gap, and two ends of the root of the fixed impeller 23 are respectively connected with the fixed impeller bracket 24 and the fan housing 21.

In practical applications, the outside air usually contains a certain amount of water vapor, which may be gathered at the stator vane carrier 24 and attached to the exposed drive shaft 11 due to the baffle effect of the stator vane carrier 24. In view of the above, in an implementable embodiment, a double annular rib structure may be provided on the side of the stationary impeller bracket 24 facing the movable impeller 22, the double annular rib structure surrounding the drive shaft 11 with a predetermined gap between the double annular rib structure and the movable impeller 22. The double annular rib structure may be configured as: two concentric circular ring-shaped

protrusions

241 and 242 are arranged on one side of the fixed impeller bracket 24 facing the movable impeller 22 by taking a central opening of the fixed impeller bracket 24 as a circle center, the outer circular ring-shaped protrusion 241 surrounds the outer edge of the fixed impeller bracket 24, and a specified distance is reserved between the inner circular ring-shaped protrusion 242 and the outer circular ring-shaped protrusion 241. When the height of the

annular protrusions

241 and 242 is set, the distance between the fixed impeller bracket 24 and the bottom of the movable impeller 22 may be set so that a predetermined gap exists between the top of the

annular protrusions

241 and 242 and the bottom of the movable impeller 22.

Due to the existence of the annular protrusion 241, the stator vane support 24 and the rotor vane 22 can be regarded as a wall plate with a gap, and accordingly, the wall plate and the inner wall of the wind shield 21 can be combined into a pipe with a gap, and the pipe is communicated with the region between the

annular protrusions

241 and 242 through the gap (for convenience of description, the region is referred to as an X region in the present application). When the movable impeller 22 rotates, the external air enters the inside of the fan housing 21 through the air inlet 211 and flows to the fixed impeller 23 through the pipeline, according to the coanda effect of fluid mechanics, when the air flows from the driven impeller 22 to the fixed impeller 23, the air flows at a high speed along the pipe wall of the pipeline, and the air pressure inside the pipeline can be lower than that in the X region by the high-speed flowing air, so that the air in the X region is sucked into the pipeline through the gap under the action of the pressure difference, the amount of the air entering the X region is reduced, the probability of moisture gathering in the X region is reduced, and correspondingly, the probability of moisture attaching to the driving shaft 11 is reduced. Through theoretical calculation and simulation analysis, when the distance from the top of the

annular protrusions

241 and 242 to the bottom of the movable impeller 22 is less than 1mm, the air pressure in the space near the driving shaft 11 can reach about-3 Kpa, so that the probability of water inflow at the driving shaft 11 is effectively reduced.

In an implementation, to increase the residence time of the air on the outer surface of the casing 12, a residence air duct may be formed by the hood 21 and the lower cavity 122. Specifically, the diameter of the fan housing 21 is set to be smaller than or equal to the diameter of the outer shell of the upper cavity 121, the fan housing 21 at least partially wraps the lower cavity 122, and an air flow passage (i.e., a residence air duct) is formed between the inner wall of the fan housing 21 and the outer shell of the lower cavity 122, so that the air flow entering the inside of the fan housing 21 is limited to flow in the residence air duct, thereby preventing irregular dissipation of the air flow and prolonging the residence time of the air flow on the outer surface of the casing 12. Further, the housing 12 is at least partially in an arc shape turning inward along the first direction. Specifically, the diameter of the outer shell of the lower cavity 122 may be set to be smaller than that of the outer shell of the upper cavity 121, and the diameter of the outer shell of the lower cavity 122 is gradually reduced along the first direction, and at the same time, the outer shell of the upper cavity 121 and the outer shell of the lower cavity 122 are smoothly transited, so that the casing 12 forms an arc shape turning inward. Thus, compared with the lower cavity 122 housing with a pure linear design, the lower cavity 122 in this embodiment has a longer heat dissipation path and a larger heat dissipation contact area for the airflow coming from the air inlet 211, and can further prolong the residence time of the airflow on the outer surface of the enclosure 12, and increase the heat dissipation effect of the air on the enclosure 12.

Optionally, the outer surface of the chassis 12 has at least one heat dissipating fin 123, and the heat dissipating fin 123 is located at an arc where the chassis 12 turns inward, that is, the heat dissipating fin 123 is located at a transition section between the upper cavity 121 and the lower cavity 122. The heat dissipation fins 123 may be made of a metal material (e.g., copper or aluminum) with good heat conduction, the roots of the heat dissipation fins 123 are connected to the outer surface of the chassis 12, and the heat dissipation fins 123 may increase the surface area of the chassis 12, thereby increasing the heat dissipation area of the chassis 12.

Optionally, the heat dissipation fins 123 extend along the outer surface of the chassis 12, and the heat dissipation fins 123 form an included angle with the central axis of the chassis 12, that is, the extending direction of the heat dissipation fins 123 is not parallel to the central axis of the chassis 12, so that the heat dissipation fins 123 can block the flow of the air, and further, the residence time of the air flow on the outer surface of the chassis 12 can be prolonged, and the heat dissipation effect of the air on the chassis 12 can be increased.

Referring to fig. 3 and 5 together, in one implementable embodiment, the motor 1 further comprises a bearing housing 4 and a bearing 5. The bearing chamber 4 is arranged radially outside the drive shaft 11, and the bearing chamber 4 surrounds the drive shaft 11, the drive shaft 11 penetrating the bearing chamber 4; the bearing 5 is located in the bearing chamber 4, and the bearing 5 is connected with the drive shaft 11 to support the drive shaft 11 for rotation. Specifically, the bearing 5 may be an integral sliding bearing, and an inner ring of the bearing 5 is connected with the driving shaft 11 to support the driving shaft 11 to rotate; the outer ring of the bearing 5 is connected to the bearing chamber 4, and the bearing 5 is fixed to a predetermined position of the housing 12 through the bearing chamber 4. The bearing chamber 4 is filled with lubricating oil, and the bearing 5 is soaked in the lubricating oil, so that the lubricating oil can reduce the friction force of the bearing 5 during movement. The specific structure and installation manner of the bearing 5 can refer to the prior art, and are not described herein. It is noted that the bearing housing 4 may be located inside the casing 12 or outside the casing 12.

Optionally, the bearing chamber 4 is provided with an elastic diaphragm 41. The elastic spacer 41 surrounds the drive shaft 11, and the shape of the elastic spacer 41 is matched to the cross section of the bearing chamber 4 so that when the elastic spacer 41 is placed in the bearing chamber 4, one end of the elastic spacer 41 abuts against the inner wall of the bearing chamber 4 and the other end of the elastic spacer 41 abuts against the drive shaft 11. The elastic diaphragm 41 may divide the bearing chamber 4 into a first chamber 42 and a second chamber 43, both the first chamber 42 and the second chamber 43 having lubricating oil therein, and the bearing 5 being located in the first chamber 42. In practice, the elastic spacer 41 may be made of a material with a low friction coefficient (e.g., teflon spacer) to reduce the abrasion of the elastic spacer 41 on the driving shaft 11.

In an embodiment, the bearing chamber 4 is located inside the casing 12, and the second chamber 43 is close to the end of the driving shaft 11 connected to the movable impeller 22, i.e. the second chamber 43 is close to the bottom opening 1221 of the lower cavity 122, so that when a small amount of external liquid enters the casing 12 through the opening 1221, the liquid can be blocked in the second chamber 43 by the elastic diaphragm 41, i.e. the external liquid cannot enter the first chamber 42, and accordingly, the external liquid cannot contact the bearing 5, thereby providing a better working environment for the bearing 5.

In order to reduce the movement of the elastic diaphragm 41 in the bearing chamber 4, optionally, the portion of the drive shaft 11 located in the bearing chamber 4 is provided with a transition section having a sloped surface 111, the elastic diaphragm 41 abuts against the sloped surface 111, and the sloped surface 111 can block the movement of the elastic diaphragm 41 in the axial direction of the drive shaft 11. On the other hand, the elastic diaphragm 41 is in interference fit with the driving shaft 11 through the slope surface 111, so that a better interference effect can be achieved, and the sealing effect of the first chamber 42 can be further improved.

Alternatively, to reduce wear of the resilient spacer 41 on the drive shaft 11, the resilient spacer 41 has an arcuate surface 411, and the arcuate surface 411 is matched to the ramped surface 111 such that the resilient spacer 41 makes line contact with the ramped surface 111 through the arcuate surface 411. Specifically, the elastic spacer 41 is in interference contact with the driving shaft 11, under the combined action of the driving shaft 11 and the bearing chamber 4, the elastic spacer 41 is bent toward the slope surface 111 to form an arc surface 411, and the arc surface 411 is abutted against the slope surface 111, so that the arc surface 411 is in line contact with the slope surface 111, that is, the direction of the friction force between the arc surface 411 and the slope surface 111 is the tangential direction of the contact surface. The line contact is formed between the arc-shaped surface 411 and the slope surface 111, so that the contact area between the elastic spacer 41 and the driving shaft 11 can be reduced, the friction force between the elastic spacer 41 and the driving shaft 11 is further reduced, and finally, the influence on the load of the motor 1 is reduced while the waterproof effect is improved.

In an achievable embodiment, as shown in fig. 7 and 8, the bracket (e.g. the coupling 221) of the movable impeller has a shielding plate 2211, the casing 12 has a shielding groove 1212, wherein the shielding plate 2211 surrounds the driving shaft 11, and the shielding plate 2211 extends from the bottom of the coupling 221 along the axial direction of the driving shaft 11 to the casing 12; the shielding groove 1212 surrounds the drive shaft 11, and the shielding groove 1212 extends from the outer surface of the casing 12 in the axial direction of the drive shaft 11 toward the coupling 221; the shapes of the shielding plate 2211 and the shielding groove 1212 are matched such that the shielding plate 2211 and the shielding groove 1212 together constitute a labyrinth structure. The labyrinth seal may encapsulate the portion of the drive shaft 11 exposed to the housing 12 to prevent moisture or chemicals from contacting the drive shaft 11. Furthermore, the labyrinth seal structure may be filled with grease to further improve the sealing effect of the labyrinth seal structure, and the grease may also lubricate the driving shaft 11.

The application still provides a cleaning device, cleaning device include the fuselage at least and set up in the inside motor 1 of fuselage, motor 1 includes inclosed casing 12 at least and is located inside stator 13, rotor 14 and the drive shaft 11 of casing 12, and wherein, stator 13 rigid coupling is on casing 12, and rotor 14 is rotatable installs in casing 12, and drive shaft 11 is fixed on rotor 14. The motor 1 is externally connected with the heat dissipating module 2, the casing 12 is at least partially oriented toward the heat dissipating module 2 along a first direction, and the diameter of the casing 12 is gradually reduced along the first direction.

Further, the heat dissipation assembly 2 includes a fan housing 21 and an impeller 22. The hood 21 has an air inlet 211, and the hood 21 covers the impeller 22, that is, the impeller 22 is completely located in the inner cavity of the hood 21. When the heat dissipation assembly 2 is mounted on the motor 1, the fan housing 21 at least partially surrounds the motor 1, that is, when the heat dissipation assembly 2 and the motor 1 are combined together, a part of the structure of the motor 1 is located in the inner cavity of the fan housing 21. The impeller 22 is connected to the driving shaft 11 of the motor 1 such that the impeller 22 can be rotated by the driving shaft 11, and when the impeller 22 is rotated, the impeller 22 can introduce external air into the inside of the hood 21 through the air inlet 211. The specific implementation structures of the motor 1 and the heat dissipation assembly 2 can be referred to the relevant contents in the above embodiments, and are not described herein again. The cleaning device may be in the form of, for example, a vacuum cleaner, a washer, a sweeping robot, or the like.

The following description will be made in detail with reference to specific application scenarios, taking a cleaning device as a dust collector as an example.

Application scenario one

A user has a swimming pool in his home and needs to clean the pool periodically to keep the pool sanitary. In general, when the swimming pool is drained, a lot of water remains at the bottom of the swimming pool, which causes a user to clean a very humid environment, and since the structure of the existing dust collector is mainly optimized for dry particle garbage, if the existing dust collector is directly used for cleaning the swimming pool, the motor in the dust collector is likely to be out of order due to water inflow. Meanwhile, the area of the swimming pool is large, so that the dust collector needs to work for a long time, and the motor in the dust collector is likely to cause overhigh temperature rise due to long-time work, and finally fails.

After long-time trial, the user finds that the existing dust collector can not meet the requirements, and under the recommendation of friends, the user decides to use a novel dust collector which is provided with the waterproof motor.

On a certain day, the user decides to clean the swimming pool, and after the water in the swimming pool is discharged, the user takes out the novel dust collector and directly uses the dust collector to absorb the residual water at the bottom of the swimming pool. Since the motor in the vacuum cleaner has a sealed housing, moisture entering the inside of the vacuum cleaner cannot enter the inside of the motor. Meanwhile, the heat dissipation assembly arranged at the end part of the motor can blow outside air to the outer surface of the motor continuously, and when the air flows through the outer surface of the motor, the air can take away heat generated by components inside the motor, so that the condition that the motor is too high in temperature rise due to long-time work is avoided. The motor in the dust collector is communicated with the dust collection air duct, so that the heat dissipation assembly in the motor can directly extract air from the dust collection air duct, and when the humid air in the dust collection air duct flows through the outer surface of the motor, the moisture in the humid air can be evaporated by the heat generated by the motor, thereby further improving the cooling effect on the motor.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electric motor, characterized in that the electric motor comprises at least a closed casing, a stator, a rotor and a driving shaft which are positioned inside the casing, and the electric motor also comprises a heat dissipation component;

the casing is at least partially oriented toward the heat dissipation assembly along a first direction, and the diameter of the casing is gradually reduced along the first direction.

2. The motor of claim 1, further comprising a thermally conductive bracket and a circuit board;

the heat conduction bracket is positioned in the shell and connected with the inner surface of the shell;

the components and parts on the circuit board face the heat conduction support and are attached to the heat conduction support, so that heat is transferred to the casing through the heat conduction support.

3. The motor of claim 2, wherein the housing has a generally cylindrical frame;

the heat conduction bracket is perpendicular to the axial direction of the frame and divides the frame into an upper cavity and a lower cavity;

the circuit board is located in the upper cavity, the stator, the rotor, and the drive shaft are located in the lower cavity, and the drive shaft penetrates through the lower cavity.

4. The motor of claim 3, wherein the heat dissipation assembly comprises a fan housing and an impeller, the fan housing at least partially surrounds the lower cavity, the lower cavity has a diameter smaller than that of the upper cavity, and the fan housing has a diameter smaller than or equal to that of the upper cavity.

5. The motor of claim 3, further comprising a overmold, the overmold including a plastic body and a stop structure;

the plastic body is matched with the outer contour of the upper cavity to wrap and seal the upper cavity;

the stop structure is located on the outer surface of the plastic body, and when the motor is installed on the motor support, the stop structure is matched with the motor support to prevent the motor from displacing.

6. The motor of claim 4, wherein the heat dissipation assembly further comprises a stationary impeller positioned inside the fan housing and behind the movable impeller to guide the external air entering the fan housing to an outer surface of the motor at a prescribed angle.

7. The motor as claimed in claim 6, wherein the bracket of the fixed impeller has a double annular rib structure on a side facing the movable impeller, the double annular rib structure surrounds the driving shaft, and a predetermined gap is provided between the double annular rib structure and the movable impeller.

8. The motor of claim 1, wherein the housing is at least partially arcuate in shape turning inward in the first direction.

9. The motor according to claim 8, wherein the outer surface of the case has at least one heat dissipation fin, and the heat dissipation fin is located at the arc shape.

10. The motor of claim 1, further comprising a bearing and a bearing chamber, the bearing chamber being provided with an elastic spacer;

the elastic diaphragm surrounds the driving shaft, one end of the elastic diaphragm is abutted to the inner wall of the bearing chamber, the other end of the elastic diaphragm is abutted to the driving shaft so as to divide the bearing chamber into a first chamber and a second chamber, and the bearing is located in the first chamber.

11. The motor of claim 10, further comprising a movable impeller, a holder of the movable impeller having a shield plate, the casing having a shield groove;

the shielding plate surrounds the driving shaft and extends from the bracket of the movable impeller to the shell direction along the axial direction of the driving shaft;

the shielding groove surrounds the driving shaft and extends from the casing to the direction of the bracket of the movable impeller along the axial direction of the driving shaft;

the shielding plate and the shielding groove form a labyrinth sealing structure.

12. A cleaning device at least comprises a machine body and a motor arranged in the machine body, and is characterized in that the motor at least comprises a closed machine shell, a stator, a rotor and a driving shaft which are positioned in the machine shell, and the motor also comprises a heat dissipation assembly;