CN109519413B

CN109519413B - Centrifugal fan, mask and electric device provided with same

Info

Publication number: CN109519413B
Application number: CN201710853519.8A
Authority: CN
Inventors: 吴尉; 雷鹏; 薛邦全
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2017-09-20
Filing date: 2017-09-20
Publication date: 2020-05-01
Anticipated expiration: 2037-09-20
Also published as: CN109519413A

Abstract

A centrifugal fan, a mask provided with the centrifugal fan, and an electric apparatus, the centrifugal fan comprising: a shaft extending along a central axis; a rotor annularly disposed around a shaft, comprising: a rotor frame surrounding at least a part of a circumferential direction of the shaft, a blade base surrounding at least a part of the circumferential direction of the rotor frame, and a plurality of blades arranged at intervals in the circumferential direction of the blade base, the plurality of blades being distributed in a first predetermined number of 1 st pitch angle domains and a second predetermined number of 2 nd pitch angle domains, the 1 st pitch angle domains and the 2 nd pitch angle domains being alternately arranged, a pitch angle in the 1 st pitch angle domain being larger than an average pitch angle, a pitch angle in the 2 nd pitch angle domain being smaller than the average pitch angle; the pitch angle is an angle formed by connecting each of two adjacent blades from the center of the central axis, and the average pitch angle is a ratio of the sum of the pitch angles to the sum of the number of the blades. With this structure, the noise of the centrifugal fan can be reduced.

Description

Centrifugal fan, mask and electric device provided with same

Technical Field

The invention relates to the field of fans, in particular to a centrifugal fan, a mask with the centrifugal fan and electrical equipment with the centrifugal fan.

Background

Recently, air pollution, dusty weather, and PM2.5 environments have serious health risks. With the development of science and technology, the use of an electric respirator is a trend to combat the deterioration of the environment. Meanwhile, portability and low noise of the electric mask are demanded.

It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention 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 invention.

Disclosure of Invention

In order to solve the problem of noise reduction of the electric mask, embodiments of the present invention provide a centrifugal fan, a mask and an electric device provided with the centrifugal fan, so as to reduce noise of the centrifugal fan.

According to a first aspect of embodiments of the present invention, there is provided a centrifugal fan including:

a shaft extending along a central axis, an

A rotor having a magnet and disposed annularly around the shaft, the rotor comprising:

a rotor frame provided so as to surround at least a part of a circumferential direction of the shaft,

a blade base provided so as to surround at least a part of a circumferential direction of the rotor frame; and

a plurality of blades arranged on one axial side of the blade base at intervals in a circumferential direction of the blade base, characterized in that:

the plurality of blades are distributed in a first preset number of 1 st pitch angle fields and a second preset number of 2 nd pitch angle fields, the 1 st pitch angle fields and the 2 nd pitch angle fields are arranged alternately, the pitch angle in the 1 st pitch angle field is larger than the average pitch angle, and the pitch angle in the 2 nd pitch angle field is smaller than the average pitch angle;

wherein the pitch angle is an angle formed by connecting each of two adjacent blades from the center of the central axis, and the average pitch angle is a ratio of a sum of the pitch angles to a sum of the number of the blades.

According to a second aspect of the embodiments of the present invention, there is provided a mask, characterized in that the mask is provided with the centrifugal fan of the first aspect.

According to a third aspect of embodiments of the present invention, there is provided an electric apparatus characterized in that the electric apparatus is provided with the centrifugal fan described in the foregoing first aspect.

The embodiment of the invention has the beneficial effects that: the noise of the centrifugal fan can be reduced by forming a plurality of blades (vanes) in unequal arrangement on one side of the rotor frame of the centrifugal fan.

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

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

Elements and features described in one drawing or one implementation of an embodiment of the invention may be combined with elements and features shown in one or more other drawings or implementations. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views, and may be used to designate corresponding parts for use in more than one embodiment.

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, 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 an exploded schematic view of a centrifugal fan of embodiment 1;

fig. 2 is a sectional view of the centrifugal fan of embodiment 1;

fig. 3 is a plan view of the centrifugal fan of embodiment 1;

FIG. 4 is a schematic view of one embodiment of pitch angles in the centrifugal fan of example 1;

FIG. 5 is a schematic illustration of another embodiment of the pitch angle in the centrifugal fan of example 1.

Detailed Description

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

In the embodiments of the present invention, the terms "1 st", "2 nd", etc. are used to distinguish different elements in terms of nomenclature, but do not indicate a spatial arrangement or temporal order, etc. of the elements, and the elements should not be limited by these 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 embodiments of the invention, the singular forms "a", "an", and the like include the plural forms and are to be construed 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 embodiment of the present invention, for the sake of convenience of description, a direction parallel to a direction in which the shaft extends is referred to as an "axial direction", a radial direction around the shaft is referred to as a "radial direction", and a circumferential direction around the shaft is referred to as a "circumferential direction", but this is for the sake of convenience of description only, and the orientation of the centrifugal fan during use and manufacture is not limited.

Various embodiments of the present invention will be described below with reference to the drawings. These embodiments are merely exemplary and are not intended to limit embodiments of the present invention.

Example 1

The present embodiment provides a centrifugal fan. Fig. 1 is an exploded schematic view of the centrifugal fan, and fig. 2 is a sectional view of the centrifugal fan.

As shown in fig. 1 and 2, the centrifugal fan includes: a shaft 100 extending along a central axis C, and a rotor 200 having a magnet 201 and disposed annularly around the shaft 100. In the present embodiment, as shown in fig. 2, the rotor 200 includes: the rotor frame 300 is provided so as to surround at least a part of the circumferential direction of the shaft 100, the vane base 400 is provided so as to surround at least a part of the circumferential direction of the rotor frame 300, and the plurality of vanes (blades) 500 are arranged on one axial side of the vane base 400 at intervals in the circumferential direction of the vane base 400. In this embodiment, the magnet 201 may be disposed radially inward of the rotor frame 300 in an annular shape.

In the present embodiment, as shown in fig. 2, the centrifugal fan may further include a stator portion 600, which is also annularly arranged around the shaft 100 and surrounded by the rotor 200. The present embodiment does not limit the structure and function of the stator portion 600, and reference may be made to the related art.

In the present embodiment, the plurality of blades 500 may be distributed in a first predetermined number of 1 st pitch angle domains and a second predetermined number of 2 nd pitch angle domains, the 1 st pitch angle domains and the 2 nd pitch angle domains being alternately arranged, and the pitch angle in the 1 st pitch angle domain is larger than the average pitch angle and the pitch angle in the 2 nd pitch angle domain is smaller than the average pitch angle.

In the present embodiment, the pitch angle is an angle formed by connecting two adjacent blades 500 from the center of the central axis C. Any position of the blade 500 may be taken for the connection, as long as the selected connection position is ensured to be the same for each blade 500, for example, a radially inner point or a radially outer point of the blade 500 is taken.

In the present embodiment, the average pitch angle refers to a ratio of a sum (i.e. 360 °) of the plurality of pitch angles to a sum of the number of the plurality of blades 500. Assuming that the number of blades 500 is 31, the average pitch angle means 360 °/31 ≈ 11.6 °.

In the present embodiment, the distribution region of the plurality of blades 500 on the blade base 400 is divided into the 1 st pitch angle region and the 2 nd pitch angle region according to the size of the pitch angle, the pitch angle in the 1 st pitch angle region is larger than the average pitch angle, the pitch angle in the 2 nd pitch angle region is smaller than the average pitch angle, and the 1 st pitch angle region and the 2 nd pitch angle region are alternately arranged, whereby the noise of the centrifugal fan can be reduced by the unequal pitch arrangement of the blades.

Fig. 3 is a plan view of an embodiment of the off-line fan of the present embodiment, showing the distribution of the blades 500, in the example of fig. 3, the first predetermined number and the second predetermined number are 2, respectively, that is, in the present embodiment, there are two 1 st pitch-

angle domains

301 and 303 and two 2 nd pitch-

angle domains

302 and 304, and as shown in fig. 3, the 1 st pitch-

angle domains

301 and 303 and the 2 nd pitch-

angle domains

302 and 304 are alternately arranged, that is, arranged in the manner of the 1 st pitch-angle domain 301, the 2 nd pitch-angle domain 302, the 1 st pitch-angle domain 303 and the 2 nd pitch-angle domain 304. Thus, since the blades 500 are disposed at unequal intervals, the noise of the centrifugal fan can be reduced.

It should be noted that the example of fig. 3 is only an example, in a specific implementation process, the numbers of the first pitch angle domains and the second pitch angle domains may be other numbers, and the numbers of the first pitch angle domains and the second pitch angle domains may be the same or different.

In one embodiment of the present embodiment, each of the 1 st pitch angle regions and each of the 2 nd pitch angle regions respectively include a continuously larger region and a continuously smaller region, the pitch angle in the continuously larger region being continuously larger, and the pitch angle in the continuously smaller region being continuously smaller. This can further reduce the noise of the fan.

Still taking the blade distribution shown in fig. 3 as an example, each of the pitch-

angle domains

301, 302, 303, 304 includes a continuously larger region in which the pitch angle is continuously larger and a continuously smaller region in which the pitch angle is continuously smaller.

Fig. 4 is a schematic diagram showing an example of the pitch angle size in each pitch angle region in the present embodiment. As shown in fig. 4, in the 1 st pitch angle region 301, there are continuously decreasing regions 401 in which 6 pitch angles are continuously decreasing, and in the 1 st pitch angle region, there are also continuously increasing regions 402 in which 3 pitch angles are continuously increasing. Also, as shown in fig. 4, in the 1 st pitch angle region 301, there may be repeated pitch angles in the continuously large region 402 and the continuously small region 401. Similarly, the 2 nd pitch angle region 302 also has a continuously larger region 402 and a continuously smaller region 401. Similarly, in the 1 st pitch-angle region 303 and the 2 nd pitch-angle region 304, there are also a continuously larger region 402 and a continuously smaller region 401, respectively (not shown in fig. 4).

With this structure, the noise of the fan can be further reduced. Fig. 4 shows a case where the 1 st pitch-angle region 301 and the 2 nd pitch-angle region 302 respectively have one continuously increasing region 402 and one continuously decreasing region 401, which is not limited in this embodiment, and each pitch-angle region may also have a plurality of continuously increasing regions 402 and a plurality of continuously decreasing regions 401, as shown in the 1 st pitch-angle region 303 and the 2 nd pitch-angle region 304 shown in fig. 4, which is not described herein again.

In a modification of the present embodiment, the at least one continuously larger or smaller region in the 1 st pitch angle region has at least one discontinuously larger or smaller pitch angle. This can further reduce the noise of the fan.

Still taking the blade profile shown in fig. 3 as an example, for the 1 st

pitch angle region

301, 303, there may be a discontinuous pitch angle in the continuously larger region or the continuously smaller region, which constitutes an inflection point in the continuously larger region or the continuously smaller region.

Fig. 5 is a schematic view showing an example of the pitch angle size in each pitch angle region in the present modification. As shown in fig. 5, in the continuously decreasing region 401 of the 1 st pitch angle region 301, there is a discontinuous pitch angle 501, and the pitch angle 501 serves as an inflection point of the continuously decreasing region 401, so that the continuously decreasing region 401 is no longer continuously decreased, and thus the pitch angle 501 is referred to as a discontinuously decreasing pitch angle. Similarly, the continuously enlarged region 402 of the 1 st pitch angle region 303 has two discontinuous pitch angles 502 and 503, and the pitch angles 502 and 503 serve as inflection points of the continuously enlarged region 402, so that the continuously enlarged region 402 is not continuously enlarged any more, and thus the pitch angles 502 and 503 are referred to as discontinuously enlarged pitch angles.

With this structure, the noise of the fan can be further reduced. Fig. 5 shows a case where the 1 st

pitch angle regions

301 and 303 respectively have discontinuous pitch angles, which is not limited in this embodiment, and the 2 nd

pitch angle regions

302 and 304 may also have discontinuous pitch angles, such as the 2 nd pitch angle region 304 shown in fig. 5, which is not described again here.

In the present embodiment, the pitch angles in at least one 1 st pitch angle region may be set to be different, and still taking the blade distribution shown in fig. 3 as an example, the pitch angles in the 1 st pitch angle region 301 may all be set to be different, that is, the blade intervals in the 1 st pitch angle region 301 are different. Likewise, the pitch angles in the 1 st pitch-angle region 303 may all be set to be different, i.e., the blade pitch in the 1 st pitch-angle region 303 may be different. This can further reduce the noise of the fan.

In this embodiment, the number of the blades is not limited, and in one embodiment, the number of the blades may be 31.

In the present embodiment, the rotor frame 300 may be made of a metal material, for example, a steel material, and thus, leakage of magnetic flux may be prevented.

In the present embodiment, as shown in fig. 1, the plurality of blades 500 and the blade base 400 may be integrally molded, for example, by resin molding, which may facilitate molding. The blade base 400 and the rotor frame 300 may be fixed by an adhesive, for example, the blade base 400 and the rotor frame 300 may be first pressed together and then fixed by an adhesive. In this way, the balance of the rotor can be maintained.

In the present embodiment, as shown in fig. 1 and 3, the plurality of blades 500 may be formed radially inward from the outer peripheral edge of the blade base 400. Further, the plurality of blades 500 may be formed to be inclined in a clockwise direction or a counterclockwise direction.

According to the structure of the centrifugal fan of the present embodiment, the plurality of blades (vanes) having unequal arrangement are formed on one side of the rotor frame of the centrifugal fan, so that the noise of the centrifugal fan can be reduced.

Example 2

This example provides a mask having the centrifugal fan described in example 1. The present embodiment does not limit the installation manner of the centrifugal fan and the mask, for example, the centrifugal fan may be installed in a breather valve of the mask. In addition, the mask is also provided with other conventional parts of the mask, the structure, the arrangement mode and the function of the conventional parts are not limited in the embodiment, and the prior art can be referred to.

According to the centrifugal fan structure of the mask of the present embodiment, the plurality of unequal blades (vanes) are formed on one side of the rotor frame of the centrifugal fan, so that the noise of the centrifugal fan can be reduced, and the practicability of the mask can be improved.

Example 3

This embodiment provides an electric product having the centrifugal fan described in embodiment 1, and also having other conventional components. The present embodiment does not limit the structure, arrangement and function of the conventional components, and reference may be made to the prior art.

In this embodiment, the centrifugal fan of embodiment 1 can be used for electric products other than masks, and the noise of the centrifugal fan can be reduced by the structure of the centrifugal fan, thereby improving the practicability of the electric products.

While the invention has been described with reference to specific embodiments, it will be apparent to those skilled in the art that these descriptions are illustrative and not intended to limit the scope of the invention. Various modifications and alterations of this invention will become apparent to those skilled in the art based upon the spirit and principles of this invention, and such modifications and alterations are also within the scope of this invention.

Claims

1. A centrifugal fan, comprising:

a shaft extending along a central axis, an

2. The centrifugal fan of claim 1, wherein the first predetermined number and the second predetermined number are each 2.

3. The centrifugal fan of claim 1,

each 1 st pitch angle field and each 2 nd pitch angle field contain continuous grow area and continuous diminish area respectively, the pitch angle in the continuous grow area is continuous grow, the pitch angle in the continuous diminish area is continuous diminish.

4. The centrifugal fan of claim 3,

at least one of the 1 st pitch angle area has at least one discontinuous larger or discontinuous smaller pitch angle.

5. The centrifugal fan according to any one of claims 1 to 4,

the pitch angles in at least one of said 1 st pitch angle regions are different.

6. The centrifugal fan according to any one of claims 1 to 4,

the number of the plurality of blades is 31.

7. The centrifugal fan according to any one of claims 1 to 4,

the rotor frame is made of a metal material.

8. The centrifugal fan according to any one of claims 1 to 4,

the plurality of blades are integrally formed with the blade base, and the blade base and the rotor frame are fixed by an adhesive.

9. The centrifugal fan according to any one of claims 1 to 4,

the plurality of blades are formed radially inward from an outer peripheral edge of the blade base.

10. The centrifugal fan according to any one of claims 1 to 4,

the plurality of blades are formed to be inclined in a clockwise direction or a counterclockwise direction.

11. A mask characterized by being provided with the centrifugal fan according to any one of claims 1 to 10.

12. An electrical apparatus, characterized in that the electrical apparatus is provided with a centrifugal fan according to any one of claims 1-10.