CN214945108U

CN214945108U - Air supply device and dust collector

Info

Publication number: CN214945108U
Application number: CN202120186583.7U
Authority: CN
Inventors: 前田真佑; 早光亮介
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2021-11-30
Anticipated expiration: 2031-01-22

Abstract

The application provides an air supply device and a dust collector. The air supply device comprises: a rotor having a shaft disposed along a central axis extending in a vertical direction; a stator arranged to be radially opposed to the rotor; an impeller disposed above the stator, fixed to the shaft, and rotatable about the central axis; and an upper casing at least a part of which is disposed above the stator and below the impeller, the upper casing including: an annular portion that is disposed above the stator and has an annular shape surrounding the central axis; and a communicating portion that communicates an upper space and a lower space of the upper housing at a radially inner side than the annular portion, wherein an upper surface of the annular portion extends downward as approaching the central axis. This can guide the gas flowing from the impeller to the communication portion along the upper surface of the annular portion, thereby cooling the stator and the rotor.

Description

Air supply device and dust collector

Technical Field

The embodiment of the application relates to the field of electromechanics, in particular to an air supply device and a dust collector.

Background

In the air supply device comprising the motor, the cooling mode of the motor comprises natural heat dissipation and heat dissipation through a heat exchange mode, and in the heat dissipation process through the heat exchange mode, the impeller of the air supply device rotates to bring heat generated by the motor away from the motor.

It should be noted that the above background description is only for the convenience of clear and complete description of the technical solutions of the present application and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present application.

SUMMERY OF THE UTILITY MODEL

The inventor finds that the heat dissipation efficiency of the conventional heat dissipation method is low.

In order to solve the above problems or other similar problems, embodiments of the present application provide an air supply device and a vacuum cleaner.

According to an aspect of an embodiment of the present application, there is provided an air blowing device including:

a rotor having a shaft disposed along a central axis extending in a vertical direction;

a stator arranged to be radially opposed to the rotor;

an impeller disposed above the stator, fixed to the shaft, and rotatable about the central axis; and

an upper casing at least a part of which is disposed above the stator and below the impeller,

the upper case has:

an annular portion that is disposed above the stator and has an annular shape surrounding the central axis; and

a communicating portion that communicates an upper space and a lower space of the upper housing at a radially inner side than the annular portion,

wherein an upper surface of the annular portion extends downward as approaching the central axis.

In some embodiments, the upper surface of the annular portion is a rounded curved surface that is concave toward the radially outer side and the lower side.

In some embodiments, a plurality of first stationary blades arranged in a circumferential direction and protruding upward are arranged on an upper surface of the annular portion, and the plurality of first stationary blades extend forward in a rotation direction of the impeller as approaching the central axis.

In some embodiments, the upper housing further has:

an inner cylindrical portion that is cylindrical and extends in the axial direction from the radially outer edge of the annular portion;

an outer cylinder portion that surrounds the inner cylinder portion and is cylindrical in shape extending in the axial direction; and

a connecting portion connecting the inner tube portion and the outer tube portion,

wherein an axial upper end of the inner cylinder portion is closer to an axial lower side than an axial upper end of the outer cylinder portion.

In some embodiments, an upper surface of the connecting portion is curved downward toward the front in the rotation direction of the impeller.

In some embodiments, the upper housing further has:

a plurality of ribs arranged in a circumferential direction and extending upward as approaching the center axis; and

an upper bearing holding portion which is connected to radially inner end portions of the plurality of ribs and has a cylindrical shape extending in an axial direction,

the air blowing device further includes an upper bearing that supports the shaft to be rotatable about the central axis, and the upper bearing is held by the upper bearing holding portion.

In some embodiments, the air blowing device further includes a diffuser, at least a portion of which is disposed below the impeller and above the upper casing, the diffuser including:

a base portion arranged below the impeller and extending in a direction intersecting the central axis;

a plurality of second stationary blades arranged radially outward of the base portion and arranged in a circumferential direction; and

and a plurality of third stationary blades which protrude downward from a lower surface of the base and extend forward in a rotation direction of the impeller as approaching the center axis.

In some embodiments, a plurality of first stationary blades arranged in a circumferential direction and protruding upward are arranged on an upper surface of the annular portion, the plurality of first stationary blades extend forward in a rotation direction of the impeller as approaching the central axis, and at least a part of the third stationary blades is arranged to face the first stationary blades in a vertical direction.

In some embodiments, a radial dimension of the third vane is shorter than a radial dimension of the first vane.

According to another aspect of the embodiments of the present application, there is provided a vacuum cleaner including the air supply device according to any one of the embodiments.

One of the beneficial effects of the embodiment of the application lies in: by designing the upper surface of the annular portion of the upper housing to extend downward as approaching the central axis, the gas flowing from the impeller can be guided to the communicating portion along the upper surface of the annular portion, thereby cooling the stator and the rotor and improving the heat radiation effect.

Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

fig. 1 is a schematic view of an example of an air blowing device of an embodiment of the present application;

FIG. 2 is a schematic axial cross-section of the blower apparatus shown in FIG. 1;

FIG. 3 is a schematic view of an upper housing of the blower apparatus shown in FIG. 1;

FIG. 4 is a top view of the upper housing shown in FIG. 3, illustrating the upper housing as viewed from the axially upper side;

FIG. 5 is a schematic view of a diffuser of the blower apparatus shown in FIG. 1;

FIG. 6 is a top view of the diffuser shown in FIG. 5, illustrating the diffuser as viewed from the axial upper side;

fig. 7 is a bottom view of the diffuser shown in fig. 5, illustrating the diffuser as viewed from the axially lower side.

Detailed Description

The foregoing and other features of the present application will become apparent from the following description, taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the application are disclosed in detail as being indicative of some of the embodiments in which the principles of the application may be employed, it being understood that the application is not limited to the described embodiments, but, on the contrary, is intended to cover all modifications, variations, and equivalents falling within the scope of the appended claims.

In the embodiments of the present application, the terms "first", "second", and the like are used for distinguishing different elements by reference, but do not denote a spatial arrangement, a temporal order, or the like of the elements, and the elements should not be limited by the terms. The term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprising," "including," "having," and the like, refer to the presence of stated features, elements, components, and do not preclude the presence or addition of one or more other features, elements, components, and elements.

In the embodiments of the present application, the singular forms "a", "an", and the like may include the plural forms and should be interpreted broadly as "a" or "an" and not limited to the meaning of "a" or "an"; furthermore, the term "comprising" should be understood to include both the singular and the plural, unless the context clearly dictates otherwise. Further, the term "according to" should be understood as "at least partially according to … …," and the term "based on" should be understood as "based at least partially on … …," unless the context clearly dictates otherwise.

In the following description of the present application, for the sake of convenience of description, a direction parallel to a direction extending along the central axis O of the air blowing device is referred to as an "axial direction"; the direction from the motor toward the impeller is referred to as "above" or "upper side" or "axially one side"; the direction pointing from the impeller to the motor is referred to as "below" or "underside" or "axially other side"; a radial direction centered on the central axis O is referred to as a "radial direction"; the direction near the central axis O is referred to as "radially inward" or "inboard"; the direction away from the central axis O is referred to as "radially outward" or "outboard"; the direction around the center axis O is referred to as "circumferential direction". It should be noted that these are for convenience of illustration only, and do not limit the orientation of the air blowing device during use and manufacture.

Embodiments of the present application will be described below with reference to the drawings.

Embodiments of the first aspect

The embodiment of the application provides an air supply device.

Fig. 1 is a schematic view of an example of an air blowing device according to an embodiment of the present application, and fig. 2 is a schematic view of an axial cross section of the air blowing device shown in fig. 1. As shown in fig. 1 and 2, the air blowing device according to the embodiment of the present application includes:

a rotor 10 having a shaft 11 disposed along a central axis O extending in the vertical direction;

a stator 20 disposed to radially face the rotor 10;

an impeller 30 disposed above the stator 20, fixed to the shaft 11, and rotatable about a central axis O; and

and an upper casing 40, at least a part of which is disposed above the stator 20 and below the impeller 30.

Fig. 3 is a schematic view of an upper cabinet 40 of the air blowing device shown in fig. 1, and fig. 4 is a plan view of the upper cabinet 40 shown in fig. 3, and as shown in fig. 3 and 4, in the embodiment of the present application, the upper cabinet 40 has:

an annular portion 41 which is disposed above the stator 20 and has an annular shape surrounding the center axis O;

and a communication portion 42 that communicates the upper space and the lower space of the upper housing 40 at a radially inner side of the annular portion 41.

In the present embodiment, as shown in fig. 3, the upper surface of the annular portion 41 extends downward as it approaches the center axis O. Accordingly, the gas flowing from the impeller can be guided to the communicating portion along the upper surface of the annular portion, and the stator and the rotor can be cooled, thereby improving the heat radiation effect.

In some embodiments, as shown in fig. 3, the upper surface of the annular portion 41 is a rounded curved surface that is concave toward the radially outer side and the lower side. This enables smooth gas introduction.

In some embodiments, as shown in fig. 3 and 4, a plurality of first stationary blades 43 arranged in the circumferential direction and protruding upward are arranged on the upper surface of the annular portion 41, and the plurality of first stationary blades 43 extend forward in the rotation direction of the impeller 30 (counterclockwise direction shown in fig. 4) as they approach the center axis O. This allows the gas to be smoothly guided by the first stationary blades 43.

In some embodiments, as shown in fig. 3 and 4, the upper housing 40 further has: an inner cylindrical portion 44 having a cylindrical shape extending in the axial direction from the radially outer edge of the annular portion 41; an outer cylinder portion 45 having a cylindrical shape extending in the axial direction around the inner cylinder portion 44; and a connecting portion 46 connecting the inner cylinder portion 44 and the outer cylinder portion 45.

In the above embodiment, as shown in fig. 2, the axial upper end of the inner cylinder portion 44 is located axially below the axial upper end of the outer cylinder portion 45, and thus, since the air flows downward, a drop in air blowing efficiency can be suppressed.

In some embodiments, as shown in fig. 3, the upper surface of the connecting portion 46 is curved downward as it goes forward in the rotation direction of the impeller (counterclockwise direction in fig. 4). Thus, the air can be guided downward and forward in the rotation direction at the connection portion, and the air blowing efficiency is improved.

In some embodiments, as shown in fig. 3 and 4, the upper housing 40 further has: a plurality of ribs 47 (three ribs 47 are shown in fig. 3 and 4, the number of ribs 47 is not limited by the present application) arranged circumferentially and extending upward as approaching the center axis O; and an upper bearing holding portion 48 which is connected to the radially inner end portions of the plurality of ribs 47 and has a cylindrical shape extending in the axial direction.

In the above embodiment, as shown in fig. 2, the blower device further includes an upper bearing 50, the upper bearing 50 rotatably supports the shaft 11 about the center axis O, and the upper bearing holder 48 holds the upper bearing 50. This enlarges the space of the communicating portion 42, and can suppress a decrease in air blowing efficiency.

In some embodiments, as shown in fig. 2, the air-blowing device further has a diffuser 60, at least a portion of which is disposed below the impeller 30 and above the upper casing 40.

FIG. 5 is a schematic view of a diffuser 60 of the blower apparatus shown in FIG. 1; FIG. 6 is a plan view of the diffuser 60 shown in FIG. 5, showing the diffuser 60 viewed from the axially upper side; fig. 7 is a bottom view of the diffuser 60 shown in fig. 5, illustrating the diffuser 60 viewed from the lower side in the axial direction.

In some embodiments, as shown in fig. 5-7. The diffuser 60 has:

a base portion 61 that is disposed below the impeller 30 and extends in a direction intersecting the center axis O;

a plurality of second stationary blades 62 arranged radially outward of the base 61 and arranged in the circumferential direction; and

and a plurality of third stationary blades 63 which protrude downward from the lower surface of the base 61 and extend forward in the rotation direction of the impeller 30 as they approach the center axis O.

Thereby, the gas can be guided to the communication portion 42 by the third stationary blades 63 of the diffuser 60.

In some embodiments, the gas can be guided to the communicating portion 42 by the third stationary blade 63 and the first stationary blade 43 in combination with the plurality of first stationary blades 43 arranged on the upper surface of the annular portion 41.

In some embodiments, the dimension d1 in the radial direction of the third vane 63 (see fig. 7) is shorter than the dimension d2 in the radial direction of the first vane 43 (see fig. 4), i.e., d1 is smaller than d 2. This contributes to weight reduction of the diffuser 60.

In some embodiments, as shown in fig. 2 to 4, the inner circumferential surface of the outer cylindrical portion 45 of the upper casing 40 may be designed in a stepped structure, and as shown in fig. 5 to 7, the diffuser 60 may further have a cylindrical portion 64 disposed around the second stationary blades 62 and extending in the axial direction. Thus, the stepped structure of the outer cylinder 45 of the upper housing 40 can support the outer cylinder of the diffuser 60, facilitating the assembly of the blower.

It should be noted that, the structure of the air supply device related to the present application is only described above, and the air supply device may also include other conventional structures, such as a cover portion, a lower casing, a lower bearing, etc., as shown in fig. 1 and fig. 2, and specific reference may be made to the related art, and the description thereof is omitted here. It is also possible to add components not shown in fig. 1 to 7 or to reduce one or more components in fig. 1 to 7. As for other configurations and structures of the air blowing device, the related art can be referred to, and the description thereof is omitted here.

According to the air supply device of the embodiment of the application, the upper surface of the annular part of the upper casing is designed to extend downwards along the central axis, so that the air flowing from the impeller can be guided to the communication part along the upper surface of the annular part, the stator and the rotor are cooled, and the heat dissipation effect is improved.

Embodiments of the second aspect

Embodiments of the second aspect of the present application provide an electrical product having the air supply device described in the embodiments of the first aspect. Since the structure of the air blowing device has been described in detail in the embodiment of the first aspect, the contents thereof are incorporated herein, and the description thereof is omitted here.

In the embodiment of the present application, the electric product is, for example, a sweeper, a vacuum cleaner, etc., and regarding other structures of the electric product, reference may be made to the related art, and a description thereof is omitted here.

The present application has been described in conjunction with specific embodiments, but it should be understood by those skilled in the art that these descriptions are intended to be illustrative, and not limiting. Various modifications and adaptations of the present application may occur to those skilled in the art based on the spirit and principles of the application and are within the scope of the application.

Preferred embodiments of the present application are described above with reference to the accompanying drawings. The many features and advantages of the embodiments are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the embodiments that fall within the true spirit and scope thereof. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the embodiments of the present application to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope thereof.

Claims

1. An air blowing device includes:

a stator arranged to be radially opposed to the rotor;

the upper case has:

the method is characterized in that:

the upper surface of the annular portion extends downward as approaching the central axis.

2. The air supply arrangement according to claim 1,

the upper surface of the annular part is a smooth curved surface which faces the radial outer side and is concave at the lower side.

3. The air supply arrangement of claim 2,

a plurality of first stationary blades arranged in a circumferential direction and protruding upward are arranged on an upper surface of the annular portion,

the first stationary blades extend forward in the rotation direction of the impeller as approaching the center axis.

4. The air supply apparatus of claim 1, wherein the upper housing further comprises:

5. The air supply arrangement according to claim 4,

an upper surface of the connecting portion is curved downward toward a front side in a rotation direction of the impeller.

6. The air supply apparatus of claim 1, wherein the upper housing further comprises:

7. The air supply arrangement according to claim 1,

the air blowing device further includes a diffuser, at least a part of which is disposed below the impeller and above the upper casing,

the diffuser has:

8. The air supply arrangement of claim 7,

a plurality of first stationary blades arranged in a circumferential direction and projecting upward are arranged on an upper surface of the annular portion,

the first stationary blades extend forward in the rotation direction of the impeller as approaching the center axis,

at least a part of the third stationary blade is disposed to face the first stationary blade in the vertical direction.

9. The air supply apparatus according to claim 8, wherein a radial dimension of the third stationary blade is shorter than a radial dimension of the first stationary blade.

10. A vacuum cleaner, characterized in that it comprises an air supply arrangement according to any one of claims 1 to 9.