Electric fan and dust collector

Abstract

The invention relates to an electric fan and a dust collector, and belongs to the technical field of electronic equipment. The electric fan comprises a machine shell, an impeller rotor assembly, a motor stator and a diffuser. The shell is provided with a first opening; the impeller rotor assembly is at least partially located in the machine shell and rotationally connected with the machine shell. The motor stator is at least partially located in the machine shell, located on the outer ring of the impeller rotor assembly and connected with the machine shell. The diffuser is connected with the machine shell, a second opening is formed in the inner wall of the diffuser, and an airflow channel between the second opening and the first opening passes through the motor stator. By adopting the electric fan, the heat dissipation efficiency of the electric fan can be improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electronic equipment, and in particular to an electric blower and a vacuum cleaner. Background Art

[0002] Nowadays, vacuum cleaners have become a common device for household cleaning. The core component of a vacuum cleaner is the electric fan, which includes an impeller, a motor rotor, a diffuser and a motor stator. The diffuser is used to convert part of the kinetic energy of the flowing air into static pressure energy.

[0003] When the electric fan is in operation, it is necessary to dissipate heat from the heat-generating motor stator. Currently, in the electric fan, the impeller is usually sleeved on the outer ring of the motor rotor, and the diffuser and the motor stator are connected in sequence to the rear end of the impeller. The air passes through the impeller and the diffuser in the electric fan in sequence, and the motor stator is cooled before being discharged.

[0004] However, in the electric blower with the above structure, the air for cooling the motor stator has been pressurized in the diffuser and has a high temperature, resulting in a low heat dissipation efficiency of the electric blower. Summary of the invention

[0005] The embodiments of the present disclosure provide an electric blower and a vacuum cleaner, which can solve the technical problems existing in the related art. The technical solutions are as follows:

[0006] In a first aspect, an embodiment of the present disclosure provides an electric blower, the electric blower comprising a casing, an impeller rotor assembly, a motor stator and a diffuser;

[0007] The housing has a first opening;

[0008] The impeller rotor assembly is at least partially located in the casing and is rotatably connected to the casing;

[0009] The motor stator is at least partially located in the housing and is located at the outer ring of the impeller rotor assembly and is connected to the housing;

[0010] The diffuser is connected to the casing, the inner wall of the diffuser has a second opening, and the air flow passage between the second opening and the first opening passes through the motor stator.

[0011] In a possible implementation manner, the second opening is located on a side of the motor stator away from the first opening.

[0012] In a possible implementation manner, the second opening is an annular through groove.

[0013] In a possible implementation manner, the casing is at least partially located in the inner circle of the diffuser and is connected to the diffuser. The casing has a third opening, and the third opening is opposite to the second opening.

[0014] In a possible implementation, the housing includes a mounting portion and a fixing portion;

[0015] The mounting portion is located at the inner circle of the diffuser and is connected to the diffuser, and the mounting portion has the third opening;

[0016] The fixing portion is located at a side of the mounting portion away from the wind shield and is connected to the mounting portion. The fixing portion has the first opening.

[0017] In a possible implementation, the impeller rotor assembly includes a rotating shaft, a permanent magnet and an impeller;

[0018] The rotating shaft is located in the housing and is rotatably connected to the housing;

[0019] The permanent magnet is located on the outer ring of the rotating shaft, corresponds to the position of the motor stator, and is connected to the rotating shaft;

[0020] The impeller is located at the inner circle of the wind cover and is connected to the rotating shaft.

[0021] In a possible implementation, the impeller rotor assembly further includes a balancing block;

[0022] The balancing weight is located on the outer ring of the rotating shaft and is connected to the rotating shaft.

[0023] In a possible implementation, the diffuser includes a first diffuser and a second diffuser;

[0024] The first diffuser is connected to the housing, the inner wall of the first diffuser has the second opening, and the deflection and diffusion angles of the first diffuser plates in the first diffuser are all first angles;

[0025] The second diffuser is located on a side of the first diffuser away from the wind cover and is connected to the casing. The second diffuser is connected to the first diffuser. The deflection and diffusion angles of the second diffuser plates in the second diffuser are both second angles, and the second angle is not equal to the first angle.

[0026] In a possible implementation, the impeller rotor assembly is rotatably connected to the casing via a bearing, and the bearing is a deep groove ball bearing.

[0027] In a possible implementation, the motor stator includes an iron core and a plurality of coils;

[0028] The iron core is located in the casing, located at the outer ring of the impeller rotor assembly, and connected to the casing;

[0029] A plurality of coils are wound around the core, with a gap between two adjacent coils.

[0030] In a possible implementation, the electric blower further includes a wind shield;

[0031] The wind cover is located on the outer ring of the impeller rotor assembly and is sealed and connected to the diffuser.

[0032] In a second aspect, an embodiment of the present disclosure provides a vacuum cleaner, which includes the electric blower in the first aspect and possible implementations thereof.

[0033] The technical solution provided by the embodiments of the present disclosure includes at least the following beneficial effects:

[0034] The disclosed embodiment provides an electric blower, in which a casing has a first opening, a diffuser has a second opening, and an airflow path between the second opening and the first opening passes through a motor stator. In this way, since negative pressure is formed inside the diffuser during operation of the electric blower, the air passes through the motor stator in the process of passing through the first opening to the second opening, and the motor stator can be cooled and dissipated. Since the air flowing from the first opening to the second opening is normal pressure air in the environment, it has not been pressurized by the diffuser and has a lower temperature. Therefore, under the condition of the same flow rate, more heat generated by the motor stator can be taken away, thereby improving the heat dissipation efficiency of the electric blower.

[0035] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 is a structural schematic diagram of an electric fan shown in an embodiment of the present disclosure;

[0038] Figure 2 is a structural schematic diagram of an electric fan shown in an embodiment of the present disclosure;

[0039] Figure 3 is a structural schematic diagram of an electric fan shown in an embodiment of the present disclosure;

[0040] Figure 4 is a structural schematic diagram of a casing and a diffuser shown in an embodiment of the present disclosure;

[0041] Figure 5 It is a schematic diagram of the structure of a coil shown in an embodiment of the present disclosure.

[0042] Legend

[0043] 1. Casing;

[0044] 1a, first opening; 1b, third opening; 1c, bearing mounting hole;

[0045] 11. Installation part; 12. Fixing part; 13. Bolt;

[0046] 111, cylinder; 112, column; 12a, second threaded hole;

[0047] 112a, first threaded hole 112a

[0048] 2. Impeller rotor assembly;

[0049] 21. Rotating shaft; 22. Permanent magnet; 23. Impeller; 24. Balance block;

[0050] 231, wheel hub; 232, blade;

[0051] 3. Motor stator;

[0052] 31. Iron core; 32. Coil;

[0053] 32a, conductor; 32b, insulating coating;

[0054] 4. Diffuser;

[0055] 41. a first diffuser; 42. a second diffuser;

[0056] 41a, a first diffuser plate; 42a, a second diffuser plate;

[0057] 5. Wind hood;

[0058] 6. Bearings. DETAILED DESCRIPTION

[0059] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0060] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent disclosure specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0061] The present disclosure provides an electric fan, such as Figure 2 As shown, the electric fan includes a casing 1, an impeller rotor assembly 2, a motor stator 3 and a diffuser 4.

[0062] The housing 1 has a first opening 1 a , the inner wall of the diffuser 4 has a second opening 4 a , and the airflow path between the second opening 4 a and the first opening 1 a passes through the motor stator.

[0063] In this way, the airflow flowing from the first opening 1 a to the second opening 4 a can cool the motor stator 3 .

[0064] Below, the various parts of the electric fan are introduced separately:

[0065] 1. Casing 1

[0066] The casing 1 is a component of the electric fan that is rotatably connected to the impeller rotor assembly 2 .

[0067] like Figure 2 As shown, both ends of the housing 1 have bearing mounting holes 1c.

[0068] The inner wall of the bearing mounting hole 1c has a pin groove, which is used to cooperate with the outer ring of the bearing through a pin key.

[0069] Optionally, the casing 1 may be located on the outer ring of the diffuser 4 .

[0070] In one example, the casing 1 may have a cylindrical structure, and bearing mounting holes 1 c are respectively provided on two end surfaces of the cylindrical structure. The cylindrical structure has a cavity inside, and the cavity is used to accommodate the diffuser 4 .

[0071] In implementation, the inner wall of the cylindrical structure is connected to the outer wall of the diffuser 4 , and the connection between the inner wall of the cylindrical structure and the outer wall of the diffuser 4 can be welding or bonding.

[0072] Optionally, the casing 1 may be located at the inner ring of the diffuser 4 .

[0073] like Figure 3 As shown, the casing 1 is at least partially located in the inner circle of the diffuser 4 and is connected to the diffuser 4. The casing 1 has a third opening 1b, which is opposite to the second opening 4a.

[0074] In this way, under the action of atmospheric pressure, the air will pass through the first opening 1a, the third opening 1b and the second opening 4a in sequence, and then enter the diffuser 4. During this process, the air passes through the motor stator 3 between the first opening 1a and the third opening 1b, and takes away the heat generated by the motor stator 3.

[0075] In one example, the housing 1 may be a split-type processed component.

[0076] like Figure 1 As shown, the housing 1 includes a mounting portion 11 and a fixing portion 12, and the mounting portion 11 and the fixing portion 12 are detachably connected.

[0077] Installation section 11

[0078] like Figure 3 As shown, the mounting portion 11 is at least partially located in the inner ring of the diffuser 4 and is connected to the diffuser 4 .

[0079] like Figure 4 As shown, the mounting portion 11 includes a cylinder 111 and a column 112 .

[0080] The cylinder 111 has a tapered cylindrical structure, and the top of the cylinder 111 has a bearing mounting hole 1c.

[0081] The column 112 is located on a side of the cylinder 111 away from the cylinder top and is connected to the cylinder 111 .

[0082] Optionally, there may be a plurality of columns 112 .

[0083] like Figure 4 As shown, the mounting portion 11 includes three columns 112 , which are distributed in a circle, and the central angle between two adjacent columns 112 is 120°. Each column 112 has a first threaded hole 112 a .

[0084] In this way, the gap between two adjacent columns 112 can form the third opening 1 b.

[0085] Fixed part 12

[0086] like Figure 4 As shown, the fixing portion 12 has an annular structure having second threaded holes 12a passing through both ends. The number of the second threaded holes 12a can be three, and the three second threaded holes 12a are distributed in a circle, and the central angle between adjacent second threaded holes 12a is 120°.

[0087] One end of the fixing portion 12 close to the mounting portion 11 is detachably connected to the mounting portion 11 , and one end of the fixing portion 12 away from the mounting portion 11 has a first opening 1 a .

[0088] Optionally, the housing 1 may further include a plurality of bolts 13 .

[0089] like Figure 4 As shown, the bolt 13 is connected to the fixing portion 12 through the second threaded hole 12a, and the bolt 13 is connected to the mounting portion 11 through the first threaded hole 112a.

[0090] In this way, the assembly efficiency of the casing 1 can be improved.

[0091] 2. Impeller rotor assembly 2

[0092] The impeller rotor assembly 2 is a component in the electric fan for causing air flow.

[0093] like Figure 3 As shown, the impeller rotor assembly 2 is at least partially located in the casing 1 and is rotatably connected to the casing 1 .

[0094] like Figure 1 As shown, the impeller rotor assembly 2 includes a rotating shaft 21 , a permanent magnet 22 and an impeller 23 .

[0095] Shaft 21

[0096] The rotating shaft 21 is a component in the impeller rotor assembly 2 that is rotatably connected to the casing 1 .

[0097] like Figure 1 As shown, the rotating shaft 21 has a cylindrical structure, one end of the bearing 21 is connected to the impeller 23, and the other end is rotatably connected to the casing through the bearing 6. The middle part of the rotating shaft 21 close to one end of the impeller 23 is also rotatably connected to the casing through the bearing 6.

[0098] Optionally, the surface of the rotating shaft 21 may be subjected to a tempering treatment or a carburizing and quenching treatment.

[0099] In this way, the surface hardness of the rotating shaft 21 can be improved, thereby improving the impact resistance of the rotating shaft 21.

[0100] Permanent magnet 22

[0101] The permanent magnet 22 is a component in the impeller rotor assembly 2 used to cooperate with the motor rotor 3 to drive the rotating shaft 21 to rotate.

[0102] like Figure 1 As shown, the impeller rotor assembly 2 includes a plurality of permanent magnets 22. The permanent magnets 22 have a strip-shaped structure and a cross section may be fan-shaped.

[0103] For example, Figure 1 As shown, the impeller rotor assembly 2 includes four permanent magnets 22, each of which has a strip-shaped structure and a sector-shaped cross-section with a circular angle of 90°.

[0104] The inner circle of each permanent magnet 22 is an arc-shaped surface, and the radius of the arc-shaped surface is equal to the outer diameter of the rotating shaft 21 . The inner circle of the permanent magnet 22 is connected to the outer circle of the rotating shaft 21 .

[0105] In one example, the inner ring of the permanent magnet 22 and the outer ring of the rotating shaft 21 may be connected by bonding.

[0106] Optionally, the magnetic poles of the outer rings of all permanent magnets 22 may be the same, for example, all are N poles or all are S poles. Alternatively, the magnetic poles of the outer rings of two adjacent permanent magnets 22 are opposite.

[0107] In this way, the motor stator 3 can generate a magnetic field, and through the interaction between the motor stator 3 and the permanent magnet 22 , the permanent magnet 22 is driven to rotate, thereby driving the rotating shaft 21 to rotate.

[0108] The material of the permanent magnet 21 may be a neodymium iron boron magnet, a samarium cobalt magnet, an aluminum nickel cobalt magnet or a ferrite magnet. The material of the permanent magnet 21 is not limited in the embodiment of the present disclosure.

[0109] Impeller 23

[0110] The impeller 23 is a component in the impeller rotor assembly 2 for driving the airflow to move.

[0111] like Figure 3 As shown, the impeller 23 is located at one end of the rotating shaft 21 away from the first opening 1 a and is connected to the rotating shaft 21 .

[0112] like Figure 1 As shown, the impeller 23 includes a hub 231 and impellers 232 .

[0113] The hub 231 is a component of the impeller 23 for connecting with the rotating shaft 21 , and the impeller 232 is a component of the impeller 23 for driving the airflow to move.

[0114] The hub 231 has a conical structure and is connected to an end of the rotating shaft 21 away from the first opening 1 a.

[0115] The blade 232 has a plate-like structure, and is located on the outer wall of the hub 231 and connected to the hub 231. The deflection diffusion angle of the blade 232 may be a first angle, and the deflection diffusion angle of the blade 232 is a first direction, and the first direction may be clockwise.

[0116] Optionally, the hub 231 and the blades 232 may be integrally formed components.

[0117] In implementation, when the hub 231 and the blade 232 are integrally formed components, the hub 231 and the blade 232 can be manufactured by a casting process or a cutting process.

[0118] The connection method between the wheel hub 231 and the rotating shaft 21 can be welding or clamping. The embodiment of the present disclosure does not limit the connection method between the wheel hub 231 and the rotating shaft 21.

[0119] Optionally, the impeller rotor assembly 2 may further include a balancing weight 24 .

[0120] like Figure 1 As shown, the balancing weight 24 has a circular ring structure.

[0121] The balancing weight 24 may be made of an alloy with a relatively high density, such as a titanium alloy.

[0122] In this way, the balancing weight 24 can have a larger moment of inertia.

[0123] In practice, when the impeller 23 rotates, a vibration load is generated. Under the effect of the vibration load, the service life of the shaft 21 will be reduced. Therefore, a balancing block 24 needs to be provided on the outer ring of the shaft 21 to increase the rotational inertia of the shaft 21 and thereby reduce the magnitude of the vibration load.

[0124] like Figure 3 As shown, the balancing weight 24 is located on the outer ring of the rotating shaft 21 and is connected to the rotating shaft 21 .

[0125] In one example, the balancing weight 24 is located on a side of the permanent magnet 22 away from the impeller 23 and is connected to the rotating shaft 21 .

[0126] In this way, the load on the shaft 21 in the axial direction can be evenly distributed, thereby increasing the service life of the shaft 21 .

[0127] 3. Motor stator 3

[0128] The motor stator 3 is a component in the electric fan for generating a magnetic field to drive the impeller rotor assembly 2 to rotate.

[0129] like Figure 3As shown, the motor stator 3 is at least partially located in the housing 1 and is located on the outer ring of the impeller rotor assembly 2 and is connected to the housing 1.

[0130] like Figure 1 As shown, the motor stator 3 includes an iron core 31 and a coil 32 .

[0131] Core 31

[0132] The iron core 31 is a component in the motor stator 3 for fixing and connecting the coil 32 .

[0133] like Figure 3 As shown, the iron core 31 is located in the casing 1 and at the outer ring of the impeller rotor assembly 2 , and is connected to the casing 1 .

[0134] Exemplarily, the connection between the core 31 and the housing 1 may be welding.

[0135] like Figure 1 As shown, the iron core 31 has a cylindrical structure, and a plurality of connecting plates are provided in the cavity of the cylindrical structure, and the plurality of connecting plates are used to divide the cavity of the cylindrical structure into a plurality of independent cavities.

[0136] Coil 32

[0137] The coil 32 is a component of the motor stator 3 for generating a magnetic field.

[0138] like Figure 1 As shown, each coil 32 is wound on a connecting plate of the iron core 31 , and the magnetic flux direction of the coil 32 is parallel to the radial direction of the iron core 31 .

[0139] Exemplarily, the core 31 may include six connecting plates, one end of which is connected to each other, and the other end is connected to the inner wall of the core 31, and the two connected connecting plates and the inner wall of the core 31 form an independent cavity, and each independent cavity has a fan-shaped structure, and the central angles thereof are equal and are all 60°.

[0140] In this way, the structure of the motor stator 3 can be made symmetrical.

[0141] Alternatively, if Figure 3 As shown, there may be a gap between two adjacent coils 32 .

[0142] In this way, the airflow can pass through the motor stator 3 through the gap when flowing from the first opening 1a to the second opening 4a, and the contact area between the motor stator 3 and the airflow is increased, thereby improving the heat dissipation efficiency.

[0143] Alternatively, if Figure 5As shown, the coil 32 may include a wire 32a and an insulating coating 32b, wherein the insulating coating 32b is evenly distributed on the outer wall of the wire 32a.

[0144] The cross-sectional shape of the conductor 32a may be circular, and the cross-sectional shape of the insulating coating 32b may be annular. The insulating coating 32b is sleeved on the outer wall of the conductor 32a.

[0145] In this way, when the insulating particles on the surface of the stator core 31 fall off, the insulating coating 32b can still prevent the current from being conducted between the coil 32 and the stator core 31 and causing a short circuit.

[0146] In practice, the coil 32 is wound around the iron core 31. When the coil 32 is energized, according to the magnetic effect of the current and Ampere's law, the end of the coil 32 close to the permanent magnet 22 can be an S pole or an N pole. For a single permanent magnet 22, the permanent magnet 22 is located between two adjacent coils 32. Since the polarities of the ends of the two adjacent coils 32 close to the permanent magnet 22 are opposite, correspondingly, in the two adjacent coils 32, the end of one coil 32 close to the permanent magnet 22 has the same polarity as the permanent magnet 22, and the end of the other coil 32 close to the permanent magnet 22 has the opposite polarity to the permanent magnet 22. According to the principle that like repels like and opposites attract, the two coils 32 have a repulsive force and an attractive force on the permanent magnet 22, respectively, so that the impeller rotor assembly 2 rotates. After the permanent magnet 22 rotates to the other coil 32, the current direction changes, and the end of the other coil 32 close to the permanent magnet 22 has a polarity opposite to that of the permanent magnet 22, so the force on the permanent magnet is changed from attractive force to repulsive force, thereby continuing to drive the impeller rotor assembly 2 to rotate.

[0147] 4. Diffuser 4

[0148] The diffuser 4 is a component in the electric blower for pressurizing the air passing through the impeller rotor assembly 2 .

[0149] like Figure 2 As shown, the diffuser 4 is connected to the casing 1 and is located at the rear end of the impeller 23 .

[0150] In practice, the rotation of the rotating shaft 21 drives the impeller 23 to rotate, and the rotation of the impeller 23 pushes the air to the rear end, forming a negative pressure in the area where the impeller 23 is located. Under the action of atmospheric pressure, the air moves from the front end to the rear end of the impeller 23 to form a stable airflow. The diffuser 4 is installed at the rear end of the impeller 23. Since the direction of the diffuser plate in the diffuser 4 is not parallel to the airflow direction, the airflow is hindered by the diffuser plate, the kinetic energy is reduced, and the static pressure can be increased, thereby increasing the pressure of the airflow passing through the diffuser 4.

[0151] The inner wall of the diffuser 4 has a second opening 4 a , and the air flow path between the second opening 4 a and the first opening 1 a passes through the motor stator 3 .

[0152] like Figure 3 As shown, the solid arrows indicate the flow direction of the airflow flowing from the impeller 23 into the diffuser 4 to be pressurized, and the dotted arrows indicate the flow direction of the airflow flowing from the first opening 1 a through the motor stator 3 to cool the motor stator 3 .

[0153] In practice, the first opening 1a is connected to the outside, and the inside of the first opening 1a is negative pressure. Under the action of atmospheric pressure, air flows from the outside to the inside of the casing 1 through the first opening 1a. Since the air flowing in from the outside is not pressurized by the diffuser 4, the temperature is relatively low, thereby improving the heat dissipation efficiency.

[0154] Alternatively, if Figure 3 As shown, the second opening 4 a may be located on a side of the motor stator 3 away from the first opening 1 a .

[0155] In this way, the second opening 4a and the first opening 1a are respectively located on both sides of the motor stator 3, and the air can pass through the motor stator 3 when flowing from the first opening 1a to the second opening 4a, thereby improving the heat dissipation efficiency.

[0156] Optionally, the second opening 4a may be an annular through groove.

[0157] like Figure 4 As shown, the diffuser 4 includes an inner wall, an outer wall and a plurality of diffuser plates. The inner wall and the outer wall of the diffuser 4 both have a cylindrical structure. The diameter of the inner wall of the diffuser 4 may be D1, and the diameter of the outer wall of the diffuser 4 may be D2. The relationship between D1 and D2 is that D1 is smaller than D2. The inner wall and the outer wall of the diffuser 4 are coaxially arranged, and the diffuser plate is located between the inner wall and the outer wall, and the two ends are connected to the inner wall and the outer wall of the diffuser 4 respectively.

[0158] The axial dimension of the inner wall of the diffuser 4 is smaller than the axial dimension of the outer wall of the diffuser 4. The inner wall and the outer wall of the diffuser 4 are flush with each other at one end close to the impeller 23. Since the axial dimension of the inner wall of the diffuser 4 is smaller than the axial dimension of the outer wall of the diffuser 4, a second opening 4a having a structure of an annular through groove can be formed at the end of the diffuser 4 away from the impeller 23.

[0159] Optionally, the second opening 4a may be a plurality of through holes.

[0160] Exemplarily, the axial directions of the plurality of through holes may be located in the same plane, and the plane may be perpendicular to the axis of the rotating shaft 21 .

[0161] In this way, the difficulty of processing the second opening 4a can be reduced.

[0162] For example, the plurality of through holes may be distributed in the axial direction of the rotating shaft 21 .

[0163] In this way, the overall strength of the diffuser 4 can be improved.

[0164] In implementation, the aperture size of the through hole can be adjusted according to the actual working power of the motor stator 3. When the actual working power of the motor stator 3 is large, the aperture of the through hole is large, and when the actual working power of the motor stator 3 is small, the aperture of the through hole is small. When the aperture of the through hole is large, the airflow from the first opening 1a to the second opening 4a is large, and the heat dissipation efficiency is high. When the aperture of the through hole is small, the airflow from the first opening 1a to the second opening 4a is small, and the heat dissipation efficiency is low, but the overall strength of the diffuser 4 is high. The technicians can set a suitable aperture according to actual needs to ensure that the diffuser 4 has a high strength while ensuring a high heat dissipation rate.

[0165] The cross-sectional shape of the through hole may be circular, rectangular, or triangular. The embodiments of the present disclosure do not limit the cross-sectional shape of the through hole.

[0166] Below, some optional structural features of the electric fan are introduced:

[0167] Structural feature 1: The electric fan may further include a wind hood 5.

[0168] The wind cover 5 is located on the outer ring of the impeller rotor assembly 2 and is sealed to the diffuser 4 .

[0169] like Figure 3 As shown, the wind cover 5 has a truncated cone structure with a truncated cone cavity inside. The wind cover 5 is located on the outer ring of the impeller 23 and is sealed to the diffuser 4 .

[0170] Optionally, the inner wall of the air cover 5 may have a positioning groove, and the outer wall of the diffuser 4 may have a positioning protrusion, and the positioning groove matches the positioning protrusion.

[0171] In this way, the assembly efficiency of the air hood 5 and the diffuser 4 can be improved.

[0172] Optionally, a sealing medium may be applied between the positioning groove and the positioning protrusion.

[0173] The sealing medium may be sealant, sealing oil, etc., and the embodiments of the present disclosure do not limit the type of the sealing medium.

[0174] Structural feature 2: The rotating shaft 21 can be rotatably connected to the housing 1 through a bearing.

[0175] like Figure 3 As shown, the electric fan further includes a plurality of bearings 6, which are all located on the outer ring of the rotating shaft 21, and the outer ring and inner ring of the bearing 6 are fixedly connected to the housing 1 and the outer ring of the rotating shaft 21 respectively.

[0176] Exemplarily, the bearing 6 and the housing 1 and the rotating shaft 21 may be connected by a pin-key fit or an interference fit.

[0177] This can improve the stability of the connection.

[0178] Optionally, the bearing 6 may be a deep groove ball bearing.

[0179] In this way, the bearing 6 has a good ability to bear axial loads and radial loads, thereby increasing the service life of the bearing 6.

[0180] Structural feature three: The diffuser 4 can be a multi-stage diffuser.

[0181] like Figure 4 As shown, the diffuser 4 includes a first diffuser portion 41 and a second diffuser portion 42 .

[0182] The first diffuser 41 is used for performing primary pressurization on the air, and the second diffuser 42 is used for performing secondary pressurization on the air.

[0183] like Figure 3 As shown, the first diffuser 41 is connected to the housing 1, the inner wall of the first diffuser 41 has a second opening 4a, and the deflection and diffusion angles of the first diffuser plate 41a in the first diffuser 41 are all the first angle. The second diffuser 42 is located on the side of the first diffuser 41 away from the wind cover 5 and is connected to the housing 1. The second diffuser 42 is connected to the first diffuser 41, and the deflection and diffusion angles of the second diffuser plate 42a in the second diffuser 42 are all the second angle, which is not equal to the first angle.

[0184] Optionally, the first angle may be greater than the second angle.

[0185] In this way, the rotation of the rotating shaft 21 drives the impeller 23 to rotate, and the rotation of the impeller 23 pushes the air to the rear end, forming a negative pressure in the area where the impeller 23 is located. Under the action of atmospheric pressure, the air moves from the front end to the rear end of the impeller 23 to form a stable airflow. The first diffuser 41 is installed at the rear end of the impeller 23. Since the orientation of the first diffuser 41 in the first diffuser 41 is not parallel to the airflow direction, the airflow is hindered by the first diffuser plate 41a, the kinetic energy is reduced, and the static pressure energy is increased. Subsequently, the airflow passes through the first diffuser 41 and enters the second diffuser 42. Since the deflection and diffusion angle of the second diffuser plate 42a in the second diffuser 42 is smaller than the deflection and diffusion angle of the first diffuser plate 41a, the airflow is hindered by the second diffuser plate 42a, the kinetic energy is reduced, and the static pressure energy is increased. In the multi-stage diffuser, the airflow is pressurized multiple times, so the pressure of the airflow passing through the diffuser 4 can be increased.

[0186] Exemplarily, the deflection and diffusion angles of the first diffuser plate 41a and the second diffuser plate 42a may both be in a second direction, the second direction being opposite to the first direction, for example, the second direction may be counterclockwise. The first angle may be 13°, and the second angle may be 8°.

[0187] Optionally, a reinforcing rib may be provided between the first diffuser plate 41 a and the inner wall of the first diffuser portion 41 .

[0188] Exemplarily, two adjacent wall surfaces of the reinforcing rib may be connected to the first diffuser plate 41 a and the inner wall of the first diffuser portion 41 , respectively.

[0189] In this way, the overall strength of the first diffuser plate 41 a can be improved.

[0190] The above optional structural features can be used individually or in combination.

[0191] The disclosed embodiment provides an electric blower, in which the housing 1 has a first opening 1a, the diffuser 4 has a second opening 4a, and the airflow path between the second opening 4a and the first opening 1a passes through the motor stator 3. In this way, the air can pass through the motor stator 3 and perform air cooling and heat dissipation on the motor stator in the process of passing through the first opening 1a to the second opening 4a. Since the air flowing from the first opening 1a to the second opening 4a is normal pressure air, it is not pressurized by the diffuser 4 and has a lower temperature. Under the condition of the same flow rate, it can take away more heat generated by the motor stator 3, thereby improving the heat dissipation efficiency of the electric blower.

[0192] The embodiment of the present disclosure also provides a vacuum cleaner, which includes the above-mentioned electric blower.

[0193] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. An electric fan, characterized in that: The electric fan comprises a casing (1), an impeller rotor assembly (2), a motor stator (3) and a diffuser (4); The housing (1) has a first opening (1a); The impeller rotor assembly (2) is at least partially located in the casing (1) and is rotatably connected to the casing (1); The motor stator (3) is at least partially located in the housing (1), is located on the outer ring of the impeller rotor assembly (2), and is connected to the housing (1); The diffuser (4) is connected to the housing (1), the inner wall of the diffuser (4) has a second opening (4a), and the air flow path between the second opening (4a) and the first opening (1a) passes through the motor stator (3).

2. The electric blower according to claim 1, characterized in that: The second opening (4a) is located on a side of the motor stator (3) away from the first opening (1a).

3. The electric blower according to claim 1 or 2, characterized in that: The second opening (4a) is an annular through groove.

4. The electric blower according to claim 1, characterized in that: The casing (1) is at least partially located in the inner circle of the diffuser (4) and is connected to the diffuser (4). The casing (1) has a third opening (1b), and the third opening (1b) is opposite to the second opening (4a).

5. The electric blower according to claim 4, characterized in that: The housing (1) comprises a mounting portion (11) and a fixing portion (12); The mounting portion (11) is located at the inner ring of the diffuser (4) and is connected to the diffuser (4); the mounting portion (11) has the third opening (1b); The fixing portion (12) is located on a side of the mounting portion (11) away from the wind cover (5) and is connected to the mounting portion (11). The fixing portion (12) has the first opening (1a).

6. The electric blower according to claim 1, characterized in that: The impeller rotor assembly (2) comprises a rotating shaft (21), a permanent magnet (22) and an impeller (23); The rotating shaft (21) is located in the housing (1) and is rotatably connected to the housing (1); The permanent magnet (22) is located on the outer ring of the rotating shaft (21), corresponds to the position of the motor stator (3), and is connected to the rotating shaft (21); The impeller (23) is located on the inner ring of the wind cover (5) and is connected to the rotating shaft (21).

7. The electric blower according to claim 6, characterized in that: The impeller rotor assembly (2) further comprises a balancing mass (24); The balancing weight (24) is located on the outer ring of the rotating shaft (21) and is connected to the rotating shaft (21).

8. The electric blower according to claim 1, characterized in that: The diffuser (4) comprises a first diffuser portion (41) and a second diffuser portion (42); The first diffuser (41) is connected to the housing (1), the inner wall of the first diffuser (41) has the second opening (4a), and the deflection and diffusion angles of the first diffuser plates (41a) in the first diffuser (41) are all first angles; The second diffuser (42) is located on a side of the first diffuser (41) away from the wind cover (5) and is connected to the housing (1); the second diffuser (42) is connected to the first diffuser (41); the deflection and diffusion angles of the second diffuser plates (42a) in the second diffuser (42) are both second angles, and the second angles are not equal to the first angles.

9. The electric blower according to claim 1, characterized in that: The impeller rotor assembly (2) is rotatably connected to the casing (1) via a bearing (6), and the bearing (6) is a deep groove ball bearing.

10. The electric blower according to claim 1, characterized in that: The motor stator (3) comprises an iron core (31) and a plurality of coils (32); The iron core (31) is located in the casing (1), is located on the outer ring of the impeller rotor assembly (2), and is connected to the casing (1); A plurality of coils (32) are wound around the iron core (21), with a gap between two adjacent coils (32).

11. The electric blower according to claim 1, characterized in that: The electric fan also includes a wind shield (5); The wind hood (5) is located on the outer ring of the impeller rotor assembly (2) and is sealed to the diffuser (4); the inner cavity of the wind hood (5) is in communication with the diffuser (4).

12. A vacuum cleaner, characterized in that: The vacuum cleaner comprises the electric blower according to any one of claims 1 to 11.

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