CN113775570B

CN113775570B - Diffuser components, electric blowers and cleaning equipment

Info

Publication number: CN113775570B
Application number: CN202111040484.9A
Authority: CN
Inventors: 金毅; 吕琢; 丁荣
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2021-09-06
Filing date: 2021-09-06
Publication date: 2024-11-26
Anticipated expiration: 2041-09-06
Also published as: CN113775570A

Abstract

The present invention discloses a diffuser assembly, an electric blower and a cleaning device, and relates to the technical field of electric blowers, wherein the diffuser assembly comprises an inner shell, an outer shell and diffuser blades, the outer shell and the inner shell are arranged at intervals, and a diffuser channel is formed between the outer shell and the inner shell; the diffuser blades are arranged in the diffuser channel and along the circumferential direction of the inner shell; along the axial direction of the inner shell, the ends of the diffuser blades protrude from the ends of the inner shell. The present invention can guide part of the airflow of the diffuser channel to the inside of the inner shell, enhance the air flow near the motor of the inner shell, accelerate the heat dissipation of the motor, and reduce the temperature of the motor; and part of the diffuser airflow is diverted at the outlet end of the diffuser channel for the heat dissipation of the motor, which has little effect on the diffuser effect, thereby enhancing the heat dissipation of the motor while ensuring the diffuser performance of the diffuser assembly.

Description

Diffuser assembly, electric fan and cleaning equipment

Technical Field

The invention relates to the technical field of electric fans, in particular to a diffuser assembly, an electric fan and cleaning equipment.

Background

In the related art, an electric fan in the handheld dust collector has small volume and high rotating speed. When the motor of the electric fan drives the impeller to rotate, larger vacuum degree is formed at the inlet of the fan housing, air flow is sucked from the opening of the fan housing, larger kinetic energy is obtained through the flow passage of the impeller, and then the air flow flows out through the diffuser at the rear part. Because the electric fan is small in size and high in power, and the air flow of the diffuser does not pass through the motor, the heat dissipation condition of the motor is poor.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the diffuser assembly provided by the invention can guide part of diffusion airflow to radiate heat of the motor, so that the radiating efficiency is improved, and the diffusion airflow is less disturbed.

The invention further provides an electric fan with the diffuser assembly.

The invention also provides cleaning equipment with the electric fan.

According to an embodiment of the first aspect of the present invention, a diffuser assembly includes: an inner case; the outer shell is arranged at intervals with the inner shell, and a diffusion channel is formed between the outer shell and the inner shell; the diffusion blades are arranged in the diffusion channel and are arranged along the circumferential direction of the inner shell; and the tail ends of the diffusion blades protrude out of the tail ends of the inner shell along the axial direction of the inner shell.

The diffuser assembly provided by the embodiment of the invention has at least the following beneficial effects:

The diffusion channel formed by the inner shell, the outer shell and the diffusion blades is arranged, the tail ends of the diffusion blades protrude out of the tail ends of the inner shell along the axial direction of the inner shell, partial airflow of the diffusion channel can be guided into the inner shell, the air flow near the motor of the inner shell is enhanced, the heat dissipation of the motor is accelerated, and the temperature of the motor is reduced; and the air outlet end of the diffusion channel is used for splitting part of diffusion airflow for heat dissipation of the motor, so that the influence on diffusion effect is small, and the heat dissipation of the motor is enhanced while the diffusion performance of the diffuser assembly is ensured.

According to some embodiments of the invention, along the axial direction of the inner casing, the height of the diffuser blade is h1, the height from the position where the inner casing is matched with the air inlet end of the diffuser blade to the tail end of the inner casing is h2, and the h1 and the h2 satisfy: h2 is more than or equal to 0.4% h1 is less than or equal to 0.8.

According to some embodiments of the invention, the inner part of the inner shell is configured to house a stator, and an outer peripheral wall of the stator is spaced from an inner peripheral wall of the inner shell.

According to some embodiments of the invention, the diffuser assembly further comprises a mounting portion for mounting a stator, the mounting portion being provided at an end of the diffuser vane in an axial direction of the inner casing.

According to some embodiments of the invention, the diffuser vane includes a plurality of first vanes and a plurality of second vanes, and the first vanes and the mounting portion are in smooth transition connection along an axial direction of the inner casing, and the second vanes are disposed between adjacent first vanes.

According to some embodiments of the invention, the first blade is integrally formed with the mounting portion.

According to some embodiments of the invention, the first blades are six, and the first blades and the second blades are uniformly distributed along the circumferential direction of the inner shell.

According to some embodiments of the invention, the mounting portion is a screw hole, and the stator is fixedly connected to the mounting portion by a screw.

A diffuser assembly according to an embodiment of the second aspect of the present invention includes: an inner case having an accommodating chamber formed therein for accommodating the stator; the outer shell is arranged at intervals with the inner shell, and a diffusion channel is formed between the outer shell and the inner shell; the diffusion blades are arranged in the diffusion channel and are arranged along the circumferential direction of the inner shell; the inner shell is provided with a notch groove at the tail end along the axial direction, and the notch groove is communicated with the diffusion channel and the accommodating cavity.

the diffusion channel formed by the inner shell, the outer shell and the diffusion blades is arranged, and the tail end of the inner shell along the axial direction is provided with the notch groove communicated with the accommodating cavity for accommodating the stator, so that partial airflow of the diffusion channel can be guided into the accommodating cavity, the air flow near the stator is enhanced, the heat dissipation of the motor is accelerated, the temperature of the motor is reduced, and the reliability and the working efficiency of the electric fan are improved; and thereby the notch groove sets up the air-out end at the diffusion passageway and is used for the heat dissipation of motor with some diffusion air current reposition of redundant personnel, less to the influence of diffusion effect, and then strengthens the motor heat dissipation when guaranteeing the diffusion performance of diffuser subassembly.

According to some embodiments of the invention, the tip of the diffuser vane protrudes from the bottom wall of the notch groove.

An electric fan according to an embodiment of the third aspect of the present invention includes the diffuser assembly described in the above embodiment.

The electric fan provided by the embodiment of the invention has at least the following beneficial effects:

by adopting the diffuser assembly of the embodiment, the diffuser assembly is provided with the diffuser channel formed by the inner shell, the outer shell and the diffuser blades, and the tail ends of the diffuser blades are protruded out of the tail ends of the inner shell along the axial direction of the inner shell, so that partial airflow of the diffuser channel can be guided into the inner shell, the air flow near the motor of the inner shell is enhanced, the heat dissipation of the motor is accelerated, the temperature of the motor is reduced, and the reliability and the working efficiency of the electric fan are improved; and the air outlet end of the diffusion channel is used for splitting part of diffusion airflow for heat dissipation of the motor, so that the influence on diffusion effect is small, and the heat dissipation of the motor is enhanced while the diffusion performance of the diffuser assembly is ensured.

A cleaning device according to a fourth aspect of the invention comprises an electric fan as described in the above embodiments.

The cleaning device provided by the embodiment of the invention has at least the following beneficial effects:

By adopting the electric fan of the embodiment of the third aspect, the electric fan comprises the diffuser assembly, the diffuser assembly is provided with the diffuser channel formed by the inner shell, the outer shell and the diffuser blades, and the tail ends of the diffuser blades are protruded out of the tail ends of the inner shell along the axial direction of the inner shell, so that partial airflow of the diffuser channel can be guided into the inner shell, the air flow near the motor of the inner shell is enhanced, the heat dissipation of the motor is accelerated, the temperature of the motor is reduced, and the reliability and the working efficiency of the electric fan are improved; and the air outlet end of the diffusion channel is used for splitting part of diffusion airflow for heat dissipation of the motor, so that the influence on diffusion effect is small, and the heat dissipation of the motor is enhanced while the diffusion performance of the diffuser assembly is ensured.

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

Drawings

The invention is further described with reference to the accompanying drawings and examples, in which:

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

FIG. 2 is an exploded view of an electric fan according to an embodiment of the present invention;

FIG. 3 is an exploded view of a stator vane and housing assembly according to one embodiment of the present invention;

FIG. 4 is a schematic view of the housing assembly of FIG. 3;

FIG. 5 is a schematic cross-sectional view of FIG. 4;

FIG. 6 is a schematic bottom view of FIG. 4;

FIG. 7 is a graph of h1/h2 versus winding temperature and fan efficiency for an electric fan in accordance with an embodiment of the present invention;

FIG. 8 is a schematic view of a chassis assembly according to another embodiment of the present invention;

FIG. 9 is a schematic view of a housing assembly according to another embodiment of the invention, with the outer shell removed;

FIG. 10a is a schematic airflow diagram of the first vane of FIG. 9;

Fig. 10b is a schematic airflow diagram of a rib in the prior art.

Reference numerals:

An electric blower 1000;

A fan housing 100;

A movable impeller 200;

A casing 300; an inner case 310; a receiving cavity 311; a housing 320; a second stage diffuser vane 330; a mounting hub 340; an installation bit 341; a connecting arm 350; ribs 360; a first vane 370; a main body 371; a thickened portion 372; a second blade 380;

a stator impeller 400; a support base 410; a first stage diffuser vane 420;

A motor 500; a stator 510; a rotor 520; a rotation shaft 530;

A circuit substrate 600.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, plural means two or more. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1 and 2, an electric fan 1000 according to an embodiment of the present invention may be used in a cleaning apparatus such as a vacuum cleaner, particularly a portable apparatus such as a hand-held vacuum cleaner or a sweeping robot with a small volume requirement. The electric fan 1000 of the embodiment of the present invention includes a fan housing 100, a movable impeller 200, a casing 300, a stationary impeller 400, and a motor 500. One end of the fan housing 100 is provided with an air inlet (not shown), and the other end of the fan housing 100 is connected to the casing 300. The movable impeller 200 is disposed in the fan housing 100, and the fan housing 100 is wrapped on the radial outer side of the movable impeller 200, and forms an air inlet channel with the fan housing 100.

Referring to fig. 3, the diffuser assembly according to the embodiment of the present invention includes a casing 300 and a stator impeller 400, where the casing 300 and the stator impeller 400 form a diffuser channel connected to an air outlet end of an air inlet channel, and the diffuser channel converts kinetic energy of an air flow into air pressure energy, so as to achieve speed reduction and pressurization of the air flow, thereby improving efficiency of the electric fan 1000. Referring to fig. 4 and 5, the casing 300 of the embodiment of the present invention includes an inner casing 310, an outer casing 320, and a second stage diffuser vane 330 positioned between the inner casing 310 and the outer casing 320. The inner casing 310 and the outer casing 320 are spaced apart, a second diffuser passage is formed between the inner casing 310 and the outer casing 320, and the second stage diffuser blades 330 are disposed along the circumferential direction of the inner casing 310.

Referring to fig. 3 and 4, the casing 300 further includes a mounting hub 340, the mounting hub 340 being fixedly coupled to the inner casing 310, the mounting hub 340 being located at an end of the inner casing 310 facing the stator 400. The stator impeller 400 includes a support base 410 and a first stage diffuser vane 420 connected to the outer periphery of the support base 410, the support base 410 is mounted on the mounting hub 340, a first diffuser passage is formed between the support base 410, the first stage diffuser vane 420 and the casing 320, the first diffuser passage is located between a second diffuser passage and an air inlet passage, and the first diffuser passage and the second diffuser passage form a diffuser passage of the electric fan 1000.

Referring to fig. 1 and 5, it can be understood that the housing 311 is formed inside the inner case 310, the housing 311 is used for accommodating the motor 500, the motor 500 includes a stator 510, a rotor 520 and a rotating shaft 530, the stator 510 is fixed in the housing 311, the rotor 520 is mounted on the rotating shaft 530, the rotating shaft 530 is mounted in the mounting position 341 of the mounting hub 340 through a bearing, an end of the rotating shaft 530 is connected with the moving impeller 200 to drive the moving impeller 200 to rotate, the air flow obtains kinetic energy from the moving impeller 200, enters the second diffusion passage through the first diffusion passage, and finally flows out of the electric fan 1000.

Referring to fig. 2, the electric fan 1000 according to an embodiment of the present invention further includes a circuit substrate 600, wherein the circuit substrate 600 is fixedly connected with the casing 300, and the circuit substrate 600 is located at the tail end of the motor 500, i.e. the end far from the impeller 200. Specifically, the cabinet 300 is provided with the connection arm 350, the connection arm 350 extends in a direction away from the wind housing 100, and the connection arm 350 may be connected with the case 320 and provided as an integral structure, so that the connection arm 350 has a higher structural strength. And the connection arm 350 is provided at the housing 320 so as not to interfere with the stator 510 easily, thereby improving convenience in mounting the stator 510 and the cabinet 300. It can be understood that the three connection arms 350 are provided, and the three connection arms 350 are disposed at intervals along the circumferential direction of the housing 320, and the circuit substrate 600 is fixedly connected to the three connection arms 350 by screwing, so that stable mounting of the circuit substrate 600 is achieved.

Referring to fig. 6, it can be understood that, along the airflow direction of the second diffusion channel, the second stage diffusion blades 330 protrude from the end of the inner casing 310 along the axial end of the inner casing 310, so that part of the airflow of the diffusion channel can be guided to the accommodating cavity 311, the air flow near the motor 500 of the inner casing 310 is enhanced, the heat dissipation of the motor 500 is accelerated, the temperature of the motor 500 is reduced, and thus the reliability of the electric fan 1000 is improved, and the working efficiency of the electric fan 1000 is improved. In addition, in the embodiment of the invention, at the air outlet end of the second diffusion channel, part of diffusion airflow is split for heat dissipation of the motor 500, so that the diffusion effect of the diffuser assembly is less influenced, and the heat dissipation of the motor 500 is enhanced while the diffusion performance of the diffuser assembly is ensured, thereby improving the performance of the electric fan 1000.

Referring to fig. 6 and 7, in the case 300 according to the embodiment of the present invention, the height of the secondary diffuser vane 330 along the axial direction of the inner case 310 is defined as h1, and the height of the mating portion between the inner case 310 and the air inlet end of the secondary diffuser vane 330 to the end of the inner case 310 along the axial direction is defined as h2. The height h1 of the secondary diffuser vane 330 and the height h2 of the inner casing 310 satisfy the relationship: h2 is more than or equal to 0.4% h1 is less than or equal to 0.8. As can be seen from fig. 7, the parameter h2/h1 is located in the range of 0.4 to 0.8, the efficiency of the electric fan 1000 is higher, the winding temperature rise of the motor 500 is lower, the effect of diffusing the diffuser assembly is less, and the heat dissipation of the motor 500 is enhanced while the diffusing performance of the diffuser assembly is ensured, so that the reliability of the motor 500 is improved, and the performance of the electric fan 1000 is improved. However, when the parameter h2/h1 is lower than 0.4, the winding temperature rise of the motor 500 is slightly lowered, but the efficiency of the electric blower 1000 is significantly lowered. When h2/h1 is higher than 0.8, the efficiency of the electric fan 1000 slightly increases, but the winding temperature of the motor 500 increases more and the cooling effect is worse.

It can be appreciated that, in order to further improve the diffusion effect of the electric fan 1000, the impact loss is reduced, the inlet side of the second stage diffusion blade 330 and the outlet side of the first stage diffusion blade 420 face the same direction, and the included angle between the tangent line of the inlet side of the first stage diffusion blade 420 and the tangent line direction of the outlet side of the second stage diffusion blade 330 is set to be less than 10 degrees, so that the flow direction of the diffusion airflow can be matched, and the diffusion effect is improved.

Referring to fig. 1 and 5, it can be understood that the inner housing 310 is provided at an inside thereof with a receiving cavity 311, and the receiving cavity 311 is used to receive the stator 510. And the stator 510 and the inner casing 310 are arranged at intervals, which can be understood that the outer circumferential wall of the stator 510 is in clearance fit with the inner circumferential wall of the inner casing 310, or that part of the outer circumferential wall of the stator 510 is in clearance fit with part of the inner circumferential wall of the inner casing 310, so that a clearance is formed, the flow speed of air flow near the motor 500 is further increased, the heat dissipation of the motor 500 is accelerated, the temperature of the motor 500 is reduced, the reliability of the electric fan 1000 is further improved, and the working efficiency of the electric fan 1000 is improved.

Referring to fig. 8, it can be understood that the case 300 is provided with ribs 360, and the ribs 360 are fixed to a mounting bracket (not shown) of the stator 510, for example, screw holes or the like are formed in the ribs 360, thereby achieving stable mounting with the stator 510. The rib 360 is disposed at an end of the inner case 310 along a flow direction of the diffusion airflow, and may be disposed at an end of the outer case 320 along a flow direction of the diffusion airflow. Along the axial direction of the inner shell 310, the ribs 360 are connected with the tail ends of the two-stage diffusion blades 330, so that the blocking area of the ribs 360 to the diffusion air flow can be reduced, the blocking of the ribs 360 to the diffusion air duct is reduced, the flow loss of the diffusion channel is reduced, and the efficiency of the electric fan 1000 is improved. It should be noted that the ribs 360 may be other types of mounting portions, which are not specifically limited herein.

Referring to fig. 9, it is understood that the casing 300 includes a plurality of first vanes 370 and a plurality of second vanes 380, and that the first vanes 370 and the second vanes 380 are disposed within the second diffuser passage and are disposed along a circumferential direction of the inner casing 310. The tip thickness of the first vane 370 is greater than the tip thickness of the second vane 380 in the direction of diffusing the airflow. The second vane 380 is a normal second stage diffuser vane 330. The first vane 370 is a vane structure designed to adapt the second stage diffuser vane 330 to the structure of the rib 360 or to be integrated with the rib 360. It is understood that the first vane 370 may have a structure in which the thickness gradually increases in the direction of diffusing the air flow. The embodiment of the invention can integrate the rib 360 which can shield the diffusion air duct in the traditional structure with the first blade 370, further reduce the blocking of the rib 360 to the diffusion air duct, greatly reduce the blocking to the diffusion air flow and improve the efficiency of the electric fan 1000. Meanwhile, the second-stage diffusion blades 330 utilize the positions of the ribs 360, the ribs 360 and the second-stage diffusion blades 330 are integrated into a whole, the space of the electric fan 1000 is saved, the axial installation space is not required to be additionally arranged, and the efficiency of the electric fan 1000 is improved.

Referring to fig. 9, it can be appreciated that the first vane 370 is smoothly coupled to the rib 360 in the axial direction of the inner case 310. To smooth the transition of the first vane 370 of the rib 360, the first vane 370 forms a second stage diffuser vane 330 having a gradually increasing thickness in the direction of airflow. Referring to fig. 10a and 10b, fig. 10a is a schematic airflow diagram of a first vane 370 of the present embodiment, and fig. 10b is a schematic airflow diagram of a rib 360 shielding a diffusion duct in a conventional structure of the prior art. In contrast, conventional structures may cause backflow of air flow, resulting in energy loss, reducing the efficiency of the electric blower 1000. Through experimental measurement and calculation, the efficiency of the electric fan 1000 adopting the first blade 370 is 48%, and the efficiency of the electric fan 1000 adopting the traditional structure without adopting the first blade 370 is 46%, so that the design of the first blade 370 of the embodiment proves that the efficiency of the electric fan 1000 can be effectively improved.

Referring to fig. 9, it will be appreciated that the first vane 370 is integrally formed with the rib 360, and is more convenient to process and has a higher structural strength. It should be noted that, in the embodiment of the present invention, the rib 360 is not provided, and the first blade 370 extends to form the mounting portion having the function of the rib 360. For example, the first blade 370 is provided with a mounting portion such as a screw hole, and the stator 510 is fixedly connected to the mounting portion by a screw, so that the assembly is facilitated and the assembly efficiency is improved.

Referring to fig. 10a, a first vane 370 according to an embodiment of the present invention has a structure in which the first vane 370 includes a main body 371 and a thickening 372 in this order in a direction of diffusing an airflow. The junction of the thickening portion 372 and the main body portion 371 is located 0.5-0.8 times of the chord length of the first blade 370, one end of the first blade 370 away from the inner shell 310 is an outer edge, and the thickness of the outer edge of the main body portion 371 is gradually increased along the direction of the diffusion airflow at a position 0.1-0.3 times of the chord length of the first blade 370, so that the thickness of the air inlet end of the first blade 370 is the same as that of the air inlet end of the second blade 380, the air inlet efficiency of the diffusion channel is improved, the diffusion effect of the first blade 370 is guaranteed, and the flow loss is reduced. The thickness of the outer edge of the thickened portion 372 is unchanged along the direction of the diffusing airflow, so that the thickened portion 372 can be provided with mounting portions such as screw holes, and the reliability of the mounting of the stator 510 is guaranteed.

Referring to fig. 9, it may be appreciated that the second blades 380 are provided in plurality, and the plurality of second blades 380 are uniformly disposed between the adjacent first blades 370, and a multi-stage diffusion passage is formed between the first blades 370 and the second blades 380, or between the second blades 380 and the second blades 380, so that a diffusion effect of the diffuser assembly is ensured, and effective noise reduction of the diffuser assembly is facilitated.

As another embodiment, the first blades 370 are provided with six and the second blades 380 are provided with nine, and the ends of the first blades 370 are provided with mounting portions, that is, six mounting portions are simultaneously used for fixing the stator, thereby making the mounting of the stator more stable. Six first blades 370 and nine second blades 380 are uniformly distributed along the circumference of the inner casing 310, so that the diffusion performance of the diffuser assembly is ensured. The arrangement order of the first and second blades 370 and 380 may have various forms, which are not particularly limited herein.

It is understood that the inner casing 310 of the above embodiment may be understood as a structure formed by cutting a circle of the inner casing 310 in the axial direction, so that the end of the second stage diffuser vane 330 protrudes beyond the end of the inner casing 310. It should be noted that, in the above embodiment, the processing of the structure may be implemented by using integral molding, or may be implemented by using a mode of cutting out a part of the inner shell 310 by using secondary processing, which is not limited herein.

It will be appreciated that the chassis 300 of another embodiment of the present invention includes an inner casing 310, an outer casing 320, and a secondary diffuser vane 330. The casing 300 of the embodiment of the present invention is substantially the same as the casing 300 of the above embodiment, except that: the end of the inner housing 310 in the axial direction of the present embodiment is provided with a notch groove (not shown in the drawing), which can communicate with the diffuser passage and the accommodating chamber 311. It should be noted that the notch groove may be replaced by a through hole, which is not specifically limited herein. The plurality of notch grooves may be provided, and the plurality of notch grooves are provided at intervals along the circumferential direction of the inner case 310.

The notch groove can guide part of airflow of the diffusion channel from the diffusion channel to the accommodating cavity 311, so that air flow near the motor 500 is enhanced, heat dissipation of the motor 500 is accelerated, temperature of the motor 500 is reduced, reliability of the electric fan 1000 is improved, and working efficiency of the electric fan 1000 is improved. Moreover, the notch groove is formed in the inner shell 310 along the tail end of the diffusion airflow to realize that part of diffusion airflow is split for heat dissipation of the motor 500, so that the diffusion effect of the diffuser assembly is less influenced, and further the heat dissipation of the motor 500 is enhanced while the diffusion performance of the diffuser assembly is ensured, and the performance of the electric fan 1000 is improved.

It can be appreciated that, along the axial direction of the inner casing 310, the end of the second stage diffusion vane 330 protrudes from the bottom wall of the notch groove, so that the diffusion airflow can be smoothly guided from the second stage diffusion vane 330 to the surface of the motor 500, thereby further enhancing the heat dissipation of the motor 500 and further improving the reliability and performance of the electric fan 1000.

Referring to FIG. 1, an electric fan 1000 in accordance with one embodiment of the present invention includes the diffuser assembly of the above embodiments. According to the electric fan 1000 of the embodiment of the invention, the diffuser assembly of the embodiment is adopted, the diffuser assembly is provided with the diffuser channel formed by the inner shell 310, the outer shell 320 and the secondary diffuser blades 330, and the tail ends of the secondary diffuser blades 330 protrude out of the tail ends of the inner shell 310 along the axial direction of the inner shell 310, so that part of airflow of the diffuser channel can be guided into the inner shell 310, the air flow near the motor 500 of the inner shell 310 is enhanced, the heat dissipation of the motor 500 is accelerated, the temperature of the motor 500 is reduced, and the reliability and the working efficiency of the electric fan 1000 are improved; and the air outlet end of the diffusion channel is used for splitting part of diffusion airflow for heat dissipation of the motor 500, so that the influence on diffusion effect is small, and the heat dissipation of the motor 500 is enhanced while the diffusion performance of the diffuser assembly is ensured.

Since the electric fan 1000 adopts all the technical solutions of the diffuser assembly of the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are provided, and will not be described herein.

The cleaning apparatus of one embodiment of the present invention includes the electric blower 1000 of the above embodiment. According to the cleaning device provided by the embodiment of the invention, the electric fan 1000 comprises the diffuser assembly, the diffuser assembly is provided with the diffuser channel formed by the inner shell 310, the outer shell 320 and the secondary diffuser blades 330, and the tail ends of the secondary diffuser blades 330 protrude out of the tail ends of the inner shell 310 along the axial direction of the inner shell 310, so that partial airflow of the diffuser channel can be guided into the inner shell 310, the air flow near the motor 500 of the inner shell 310 is enhanced, the heat dissipation of the motor 500 is accelerated, the temperature of the motor 500 is reduced, and the reliability and the working efficiency of the electric fan 1000 are improved; and the air outlet end of the diffusion channel is used for splitting part of diffusion airflow for heat dissipation of the motor 500, so that the influence on diffusion effect is small, and the heat dissipation of the motor 500 is enhanced while the diffusion performance of the diffuser assembly is ensured.

The cleaning device adopts all the technical solutions of the diffuser assembly of the above embodiments, so that at least all the beneficial effects brought by the technical solutions of the above embodiments are provided, and are not described herein.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.

Claims

1. A diffuser assembly, comprising:

An inner case;

The outer shell is arranged at intervals with the inner shell, and a diffusion channel is formed between the outer shell and the inner shell;

the diffusion blades are arranged in the diffusion channel and are arranged along the circumferential direction of the inner shell;

Wherein, along the axial direction of the inner shell, the tail end of the diffusion blade protrudes out of the tail end of the inner shell;

The diffuser assembly further comprises a mounting part for mounting a stator, wherein the mounting part is arranged at the tail end of the diffuser blade along the axial direction of the inner shell; the diffusion blades comprise a plurality of first blades and a plurality of second blades, the first blades are connected with the mounting part in a smooth transition manner along the axial direction of the inner shell, and the second blades are arranged between the adjacent first blades; the thickness of the tail end of the first blade is larger than that of the tail end of the second blade along the direction of diffusing the airflow, and the thickness of the first blade is gradually increased along the direction of diffusing the airflow; the structure of the first blade sequentially comprises a main body part and a thickening part along the direction of the diffusion airflow, wherein the junction of the thickening part and the main body part is positioned at the position of 0.5-0.8 times of the chord length of the first blade, one end of the first blade, which is far away from the inner shell, is an outer edge, and the thickness of the outer edge of the main body part is gradually increased along the direction of the diffusion airflow at the position of 0.1-0.3 times of the chord length of the first blade.

2. The diffuser assembly of claim 1, wherein: along the axial of inner shell, the height of diffusion blade is h1, the inner shell with diffusion blade's air inlet end cooperation department extremely the height of the terminal of inner shell is h2, h1 with h2 satisfies: h2 is more than or equal to 0.4% h1 is less than or equal to 0.8.

3. The diffuser assembly of claim 1, wherein: the inside of inner shell is used for holding the stator, the periphery wall of stator with the inner peripheral wall interval setting of inner shell.

4. The diffuser assembly of claim 1, wherein: the thickness of the outer edge of the thickening part is unchanged along the direction of the diffusion airflow.

5. The diffuser assembly of claim 1, wherein: the first blade and the mounting portion are integrally formed.

6. The diffuser assembly of claim 1, wherein: the first blades are six, and the first blades and the second blades are uniformly distributed along the circumference of the inner shell.

7. The diffuser assembly of claim 1, wherein: the mounting part is a screw hole, and the stator is fixedly connected to the mounting part through a screw.

8. The diffuser assembly according to any one of claims 1 to 7, wherein:

An accommodating cavity for accommodating a stator is formed inside the inner shell;

The inner shell is provided with a notch groove at the tail end along the axial direction, and the notch groove is communicated with the diffusion channel and the accommodating cavity.

9. The diffuser assembly of claim 8, wherein: along the axial direction of the inner shell, the tail ends of the diffusion blades protrude out of the bottom wall of the notch groove.

10. Electric fan, its characterized in that: comprising a diffuser assembly according to any one of claims 1 to 9.

11. The electric fan as claimed in claim 10, wherein: the diffusion channel is a second diffusion channel, and the diffusion blades are second-stage diffusion blades;

The electric fan further comprises a mounting hub and a fixed impeller, the mounting hub is fixedly connected with the inner shell, the mounting hub is located at one end of the inner shell facing the fixed impeller, the fixed impeller comprises a supporting seat and one-stage diffusion blades connected to the periphery of the supporting seat, the supporting seat is mounted on the mounting hub, a first diffusion channel is formed between the supporting seat and the outer shell and located upstream of the air inlet direction of the electric fan relative to the second diffusion channel.

12. The electric fan as claimed in claim 11, wherein: the inlet side of the secondary diffusion blade and the outlet side of the primary diffusion blade face the same direction, and an included angle between a tangent line of the inlet side of the primary diffusion blade and a tangent line direction of the outlet side of the secondary diffusion blade is smaller than 10 degrees.

13. Cleaning device, its characterized in that: comprising an electric fan as claimed in any of the claims 10 to 12.