CN211474469U

CN211474469U - Air supply device and electrical equipment

Info

Publication number: CN211474469U
Application number: CN201921917307.2U
Authority: CN
Inventors: 吴尉; 梁思捷
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-09-11
Anticipated expiration: 2029-11-08

Abstract

The embodiment of the application provides an air supply arrangement and electrical equipment, air supply arrangement includes: impeller, motor, circuit board to and the casing, the casing has last casing and lower casing, and the one side that is close to the circuit board of lower casing has: a motor support portion which is circular when viewed in an axial direction and has a central axis; an exhaust port part which is communicated with at least one part of the outer side of the motor supporting part and forms an exhaust port of the air supply device; a first step portion located on one side of the exhaust port portion, a surface of the first step portion being closer to the circuit board with respect to surfaces of the exhaust port portion and the motor support portion; and a second step portion located on a side of the first step portion not adjacent to the exhaust port portion and located on a circumferential outer side of a position of the motor support portion not adjacent to the exhaust port portion, a surface of the second step portion being closer to the circuit board than a surface of the first step portion. Through the design of the section difference at the air outlet, the maximum air quantity of the stop-motion revolution number is improved, and the efficiency of the fan is improved.

Description

Air supply device and electrical equipment

Technical Field

The present application relates to the field of motors.

Background

In general, an air duct structure of an air blower, such as a fan, is a structure of a stepped flow path, which causes an air outlet to be unsmooth, affects the air volume of the fan, and also affects the hearing.

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

In order to solve at least one of the above problems or other similar problems, embodiments of the present application provide an air supply device and an electrical apparatus, so as to improve the air volume at the air outlet and improve the fan efficiency.

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

an impeller is arranged on the upper portion of the shell,

a motor located on one axial side of the impeller and driving the impeller to rotate;

a circuit board disposed on one side of the motor in an axial direction and supplying current to the motor; and

a housing accommodating the motor, the circuit board, and the impeller,

wherein the content of the first and second substances,

the casing has an upper casing and a lower casing, and one side of the lower casing close to the circuit board has:

a motor support portion that is circular when viewed in an axial direction and has a central axis;

an exhaust port portion which communicates with at least a part of the outside of the motor support portion and forms an exhaust port of the blower;

a first step portion located on one side of the exhaust port portion, a surface of the first step portion being closer to the circuit board than surfaces of the exhaust port portion and the motor support portion; and

a second step portion located on a side of the first step portion not adjacent to the exhaust port portion and located on a circumferential outer side of a position of the motor support portion not adjacent to the exhaust port portion, a surface of the second step portion being closer to the circuit board than a surface of the first step portion.

In one or more embodiments, a position where the exhaust port portion intersects with the first stepped portion is a straight line as viewed in the axial direction, and extends from the position where the exhaust port portion intersects with the motor support portion in a direction away from the motor support portion.

In one or more embodiments, when viewed in the axial direction, a position where the first step portion intersects with the second step portion is a curved line or a straight line, and extends from a position where the first step portion intersects with the motor support portion in a direction away from the motor support portion.

In one or more embodiments, a center hole through which a shaft of the motor passes is provided at a central position of the motor support portion, and a protruding portion provided around the center hole and supporting the circuit board has a cylindrical portion, a first abutting portion provided at an axially upper surface of the cylindrical portion and abutting against the circuit board, and a first mounting hole extending in an axial direction provided at a central position of the axially upper surface of the cylindrical portion.

In one or more embodiments, a plurality of ribs are provided on the outer circumferential surface of the cylindrical portion, and the plurality of ribs are arranged at equal intervals in the circumferential direction on the outer circumferential surface of the cylindrical portion.

In one or more embodiments, the first abutting portion includes an arc portion and an extending portion extending radially inward from at least a part of the arc portion, an outer peripheral surface of the arc portion overlaps with a part of an outer peripheral surface of the cylindrical portion as viewed in an axial direction, a radially inner surface of the arc portion forms a first abutting surface abutting against the circuit board, and surfaces on both sides in a circumferential direction of the extending portion form second abutting surfaces abutting against the circuit board.

In one or more embodiments, an outer peripheral surface of the first abutting portion overlaps a part of an outer peripheral surface of the cylindrical portion as viewed in an axial direction, surfaces on both sides in a circumferential direction of the first abutting portion are formed as second abutting surfaces that abut against the circuit board, and at least a part of a radially inner surface of the first abutting portion is formed as a first abutting surface that abuts against the circuit board.

In one or more embodiments, the edge of the circuit board is formed with a fixing portion having a second abutting portion formed with a third abutting surface that abuts the first abutting surface in a radial direction and a fourth abutting surface that abuts the second abutting surface in a circumferential direction, and a mounting portion formed with a second mounting hole that penetrates the circuit board and is opposed to the first mounting hole in an axial direction.

In one or more embodiments, the diameter of the second mounting hole is greater than the diameter of the first mounting hole.

In one or more embodiments, a radially outer side of the first abutting portion is located closer to a radially outer side with respect to a circular arc line formed by an outer periphery of the circuit board as viewed in an axial direction.

In one or more embodiments, an axial height of the first abutment portion is smaller than an axial height of the circuit board as viewed in a radial direction.

In one or more embodiments, the number of the protruding portions is three, and the three protruding portions are arranged at equal intervals in the circumferential direction centering on the central axis of the motor.

In one or more embodiments, a wire outlet penetrating through the lower case is provided on the lower case, and the air blowing device further includes a rubber member sealing the wire outlet.

In one or more embodiments, the rubber member has a first main body portion having an area larger than an area of the wire lead-out opening, a connection portion extending from at least a part of the first main body portion in an axial direction, and a second main body portion extending from the connection portion in a radial direction, the area of the second main body portion is smaller than the area of the first main body portion, the first main body portion is located on a side of the lower housing away from the circuit board, the second main body portion is located on a side of the lower housing close to the circuit board, and a receiving space for leading out a wire is formed between the first main body portion and the second main body portion.

In one or more embodiments, a wire regulating portion that regulates a wire drawn from the wire drawing port is provided on a side of the lower case away from the circuit board.

In one or more embodiments, the wire regulation has at least one radially extending radial regulation and at least one circumferentially extending circumferential regulation.

According to another aspect of the embodiments of the present application, there is provided an electric apparatus having the aforementioned air blowing device.

One of the beneficial effects of the embodiment of the application lies in: through the design of the section difference at the air outlet, the maximum air quantity of the stop-motion revolution number is improved, and the efficiency of the fan is improved.

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.

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

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 sectional view of an air blowing device according to an embodiment of the present application;

FIG. 2 is a schematic view of a lower housing of the blower apparatus shown in FIG. 1;

FIG. 3 is a schematic view of a projection of the blower apparatus shown in FIG. 1;

fig. 4 is a schematic view of the first abutting portion of the protruding portion of the air blowing device shown in fig. 1 abutting against the circuit board;

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

FIG. 6 is an enlarged partial schematic view of the circuit board shown in FIG. 5;

FIG. 7 is a schematic view of a rubber component;

FIG. 8 is a cross-sectional view of the rubber component shown in FIG. 7;

FIG. 9 is a schematic view of the rubber component as viewed from the interior of the housing;

fig. 10 is a schematic view of the rubber member viewed from the outside of the housing.

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, one or more embodiments of the present 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 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 application, for convenience of explanation, unless otherwise specified, a direction parallel to a direction extending along the axis of the motor is referred to as an "axial direction", a radial direction around the axis of the motor is referred to as a "radial direction", and a direction surrounding the axis of the motor is referred to as a "circumferential direction", but this is merely for convenience of explanation, and the orientation of the motor or the air blowing device including the motor is not limited when it is used or manufactured.

The air blowing device and the electric apparatus according to the embodiments of the present application will be described below with reference to the drawings.

First aspect of the embodiments

A first aspect of an embodiment of the present application provides an air supply device.

Fig. 1 is a sectional view of an air blowing device according to an embodiment of the present application. As shown in fig. 1, the blower device includes an impeller 10, a motor 20, a circuit board 30, and a casing 40. The motor 20 is located on one axial side (lower side as viewed in fig. 1) of the impeller 10, and drives the impeller 10 to rotate. The circuit board 30 is disposed on one side (lower side in fig. 1) in the axial direction of the motor 20 and supplies electric current to the motor 20. The housing 40 accommodates the motor 20, the circuit board 30, and the impeller 10. In addition, the air supply device may further include other components, such as a rotor holder 50 and a casing cover 60 shown in fig. 1, which may refer to related technologies and are not described herein again. In the embodiment of the present application, the detailed configuration relationship among the impeller 10, the motor 20, the circuit board 30 and the housing 40 can refer to the related art, and will not be described herein.

In the embodiment of the present application, as shown in fig. 1, the housing 40 has an upper housing 41 and a lower housing 42, fig. 2 is a schematic view of the lower housing 42, and as shown in fig. 2, a side of the lower housing 42 close to the circuit board 30 has a motor support portion 421, an air vent portion 422, a first stepped portion 423, and a second stepped portion 424.

The motor support portion 421 is circular in shape when viewed in the axial direction, and has a central axis, and the central axis of the motor support portion 421 coincides with a central axis O (see fig. 1) of the motor 20. The exhaust port 422 communicates with at least a part of the outside of the motor support 421, and forms an exhaust port (i.e., an air outlet) of the blower. The first stepped portion 423 is located on one side (the right side in fig. 2) of the air outlet portion 422, and the surface of the first stepped portion 423 is closer to the circuit board 30 than the surfaces of the air outlet portion 422 and the motor support portion 421, that is, the first stepped portion 423 is higher than the air outlet portion 422 and the motor support portion 421 as viewed from the inside of the housing 40. The second stepped portion 424 is located on a side (right side in fig. 2) of the first stepped portion 423 that is not adjacent to the air outlet portion 422, and is located on a circumferential outer side of the position of the motor support portion 421 that is not adjacent to the air outlet portion 422, and a surface of the second stepped portion 424 is closer to the circuit board 30 than a surface of the first stepped portion 423, that is, the second stepped portion 424 is higher than the first stepped portion 423 as viewed from the inside of the housing 40.

By the structure, the design of the drainage segment difference is carried out beside the air outlet, so that the effect of conducting drainage on air is achieved, air outlet is free of obstruction, the maximum air quantity of the fixed-grid revolution number is increased, the efficiency of the fan is improved, and the hearing sense is improved.

In at least one embodiment, as shown in fig. 2, the position where the exhaust port portion 422 intersects with the first stepped portion 423 is a straight line when viewed in the axial direction, and extends from the position where it intersects with the motor support portion 421 to a direction away from the motor support portion (similar to extending along a tangent line). Thereby, wind is advantageously guided.

In at least one embodiment, as shown in fig. 2, the position where the first stepped portion 423 intersects the second stepped portion 424 is curved when viewed in the axial direction, and extends from the position where it intersects the motor support portion 421 to a direction away from the motor support portion 421. Thereby, the function of guiding wind is also achieved. In addition, the present invention is not limited to the structure in which the position where the first stepped portion 423 and the second stepped portion 424 intersect is curved, and the position where the first stepped portion 423 and the second stepped portion 424 intersect may be a straight line, and similarly to the position where the exhaust port portion 422 and the first stepped portion 423 intersect, the present invention can also function to guide wind.

In the embodiment of the present application, as shown in fig. 2, a center hole 425 through which a shaft of the motor 20 passes is provided at a center position of the motor support 421, and a protrusion 426 supporting the circuit board 30 is provided around the center hole 425. Fig. 3 is a schematic view of the protrusion 426. As shown in fig. 3, the protruding portion 426 has a cylinder portion 4261, a first abutting portion 4262 provided on an axially upper surface of the cylinder portion 4261 to abut against the circuit board 30, and a first mounting hole 4263 extending in the axial direction provided at a central position of the axially upper surface of the cylinder portion 4261.

Fig. 4 is a schematic view showing the first abutting portion 4262 of the protruding portion 426 abutting against the circuit board 30, and as shown in fig. 4, the design of the first abutting portion 4262 can fix the circuit board 30 in the circumferential direction before the screw is attached, prevent the circuit board 30 from moving in the circumferential direction, and then fix the circuit board 30 in the axial direction by attaching the screw, thereby controlling the mechanical advance angle of the motor 20 and ensuring the characteristics of the motor 20.

In at least one embodiment, as shown in fig. 3 and 4, a plurality of ribs 4264 are provided on the outer circumferential surface of the cylinder portion 4261, and the plurality of ribs 4264 are arranged at equal intervals in the circumferential direction on the outer circumferential surface of the cylinder portion 4261. Thereby, it is possible to function to support the cylinder part 4261 and to increase the strength of the cylinder part 4261. In the example of fig. 3 and 4, the number of the ribs 4264 is three, and the radial length is formed to be narrower as the distance from the center of the first mounting hole 4263 to the upper surface of the cylinder portion 4261 becomes smaller, but the present invention is not limited thereto, and the ribs 4264 may be formed in other structures or in other numbers.

In the present embodiment, as shown in fig. 3 and 4, when viewed in the axial direction, the outer peripheral surface of the first contact portion 4262 overlaps a portion of the outer peripheral surface of the cylindrical portion 4261, the surfaces a2 on both circumferential sides of the first contact portion 4262 form second contact surfaces that contact the circuit board 30, and at least a portion of the radially inner surface a1 of the first contact portion 4262 forms a first contact surface that contacts the circuit board 30. With this configuration, the circumferential surface a2 abuts against the circuit board 30 to prevent the circuit board 30 from moving in the circumferential direction, and the radial surface a1 abuts against the circuit board 30 to prevent the circuit board 30 from moving in the radial direction, so that after the screw is mounted to the first mounting hole 4263, the circuit board 30 is prevented from moving in any direction, and thus the circuit board 30 can be fixed to ensure the mechanical advance angle of the motor 20, and the characteristics of the blower can be further ensured.

The above structure of the first abutting portion 4262 is merely an example, and any structure of the first abutting portion 4262 that can abut against the circuit board 30 in the circumferential direction is included in the scope of the present application. For example, the first abutment portion 4262 may be designed as follows: the first contact portion 4262 includes an arc-shaped portion (not shown) and an extended portion (not shown) extending radially inward from at least a part of the arc-shaped portion, and has an outer peripheral surface overlapping a part of an outer peripheral surface of the cylindrical portion 4261 as viewed in the axial direction, a radially inner surface of the arc-shaped portion forming a first contact surface a1 contacting the circuit board 30, and surfaces on both sides in the circumferential direction of the extended portion forming a second contact surface a2 contacting the circuit board 30. With this structure, the circuit board 30 can be prevented from moving in the circumferential direction as well as in the radial direction.

Fig. 5 is a schematic view of the circuit board 30, fig. 6 is an enlarged schematic view of a broken-line frame portion of the circuit board 30 shown in fig. 5, and as shown in fig. 5, a fixing portion 31 is formed at an edge of the circuit board 30, and as shown in fig. 6, the fixing portion 31 has a second contact portion 311 and a mounting portion 312, the second contact portion 311 is formed with a third contact surface B1 that contacts the first contact surface a1 in a radial direction and a fourth contact surface B2 that contacts the second contact surface a2 in a circumferential direction, and the mounting portion 312 is formed with a second mounting hole 3121 that penetrates the circuit board 30 and faces the first mounting hole 413 in an axial direction. With the above-described structure of the circuit board, the circuit board 30 can abut against the first abutting portion 4262, thereby preventing play of the circuit board 30, as shown in fig. 3.

In the embodiment of the present application, as shown in fig. 3, the diameter of the second mounting hole 3121 may be larger than that of the first mounting hole 4263, thereby facilitating fixing by a screw, but the present application is not limited thereto, and the sizes of the first mounting hole 4263 and the second mounting hole 3121 may have other relations according to the material of the circuit board 30 and the protrusion 426.

In the present embodiment, as shown in fig. 4, the radially outer side of the first abutment portion 4262 is located radially outward relative to an arc line (a broken line shown in fig. 4) formed by the outer periphery of the circuit board 30 as viewed in the axial direction. This makes it possible to ensure that the first abutting portion 4262 abuts the circuit board 30 more effectively, to fix the circuit board 30 firmly and accurately, and to stabilize the support of the circuit board 30 by the protruding portion 426.

In the present embodiment, as shown in fig. 4, the axial height of the first abutment portion 4262 is smaller than the axial height of the circuit board 30 as viewed in the radial direction. That is, the upper surface of the circuit board 30 is higher than the upper surface of the first abutting portion 4262, and here, the upper side shown in fig. 1 is taken as "upper". Thereby, it is facilitated to stably fix the circuit board to the protrusion 426 by a screw. However, the present application is not limited thereto, and the axial height of the first abutment portion 4262 may be the same as the axial height of the circuit board 30, that is, the upper surfaces thereof may be on the same plane.

In at least one embodiment, as shown in fig. 2, the number of the protruding portions 426 is three, and the three protruding portions 426 are arranged at equal intervals in the circumferential direction around the central axis O of the motor 20. Whereby the circuit board 30 can be stably supported.

In the embodiment of the present application, as shown in fig. 2, the lower case 42 is provided with a wire outlet 427 penetrating the lower case 42, the wire outlet 427 is used for leading out the wire from the circuit board 30 to the outside of the lower case 42, and the air blowing device further has a rubber member 70 (not shown in fig. 2) sealing the wire outlet 427.

Fig. 7 is a schematic view of the rubber member 70, fig. 8 is a sectional view of the rubber member 70, fig. 9 is a schematic view of the rubber member 70 as viewed from the inside of the lower housing 42, and fig. 10 is a schematic view of the rubber member 70 as viewed from the outside of the lower housing 42.

As shown in fig. 7 and 8, the rubber member 70 has a first body portion 71 having an area larger than that of the wire lead-out opening 427, a connecting portion 72 extending in the axial direction from at least a part of the first body portion 71, and a second body portion 73 extending in the radial direction from the connecting portion 72, the area of the second body portion 73 being smaller than that of the first body portion 71. As shown in fig. 10, the first body portion 71 is located on a side of the lower case 42 away from the circuit board 30 (i.e., outside the lower case 42). As shown in fig. 9, the second body portion 73 is located on a side of the lower case 42 close to the circuit board 30 (i.e., inside the lower case 42), and a receiving space for the lead wire W to be led out is formed between the first body portion 71 and the second body portion 73. The rubber member 70 can prevent dust and the like from entering the inside of the air blower, and can fix the lead wire W drawn out from the circuit board 30.

In the embodiment of the present application, as shown in fig. 2 and 9, a demolding hole 428 may be further disposed on the lower shell 42, and the demolding hole 428 penetrates through the lower shell 42, and the position of the demolding hole 428 is not limited in the present application. The knockout hole 428 facilitates the knockout of the housing 40 when the housing 40 is formed by a die.

In the embodiment of the present application, as shown in fig. 10, a wire regulating portion 43 is provided on a side of the lower case 42 away from the circuit board 30 (outside of the lower case 42), and the wire regulating portion 43 regulates the wire W drawn from the wire drawing port 427. As shown in fig. 10, the wire regulating portion 43 may have an axial regulating portion 431 regulating the wire W in the axial direction and a circumferential regulating portion 432 regulating the wire W in the circumferential direction.

While one axial regulation portion 431 and one circumferential regulation portion 432 are shown in fig. 10, the number of the axial regulation portions 431 and the circumferential regulation portions 432 is not limited in the present application, and for example, a plurality of axial regulation portions 431 and a plurality of circumferential regulation portions 432 may be provided. By the wire regulating portion 43, the wire W can be prevented from loosening, and interference between the wire W and other components can be avoided.

The above description has been made only for the structure of the housing 40 related to the present application, and the present application does not limit other configurations of the housing 40, and reference may be made to the related art.

In the embodiment of the present application, the air blowing device may further include a filter member disposed on one axial side (upper side as shown in fig. 1) of the upper casing 41, and the present application does not limit the manner of disposing the filter member, and reference may be made to the related art.

Through the air supply arrangement of this application embodiment, owing to carried out the design of drainage segment difference by the air outlet, played the effect of carrying out the drainage to wind for the air-out is unimpeded, thereby has not only improved the maximum amount of wind of stop-motion gyration number, has improved fan efficiency, has still improved the audibility. Further, by providing the protrusion 426 on the lower case 42, the circuit board 30 is prevented from moving in the circumferential direction, and thereby, the advance angle of the motor 20 can be controlled, and the characteristics of the motor 20 can be ensured.

Second aspect of the embodiments

A second aspect of the embodiments of the present application provides an electrical apparatus, which has the air supply device of the first aspect of the embodiments, and since the structure of the air supply device has been described in detail in the first aspect of the embodiments, the contents of the air supply device are incorporated herein, and are not described again here.

In the embodiment of the present application, the electrical device may be all devices that need to be provided with an air supply device, such as an air conditioner compressor, a sweeper, various office automation devices, a medical device, a conveying device, or a household electrical appliance such as a vacuum cleaner.

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.

Claims

1. An air supply arrangement, comprising:

an impeller is arranged on the upper portion of the shell,

a housing accommodating the motor, the circuit board, and the impeller,

it is characterized in that the preparation method is characterized in that,

2. The air supply device according to claim 1, wherein a position where the exhaust port portion intersects the first stepped portion is a straight line as viewed in an axial direction, and extends from a position where the exhaust port portion intersects the motor support portion in a direction away from the motor support portion.

3. The air supply device according to claim 1, wherein a position where the first step portion intersects with the second step portion is a curved line or a straight line as viewed in the axial direction, and extends from the position where the first step portion intersects with the motor support portion in a direction away from the motor support portion.

4. The air supply device according to any one of claims 1 to 3, wherein a center hole through which a shaft of the motor passes is provided at a central position of the motor support portion, and a protruding portion provided around the center hole and supporting the circuit board has a cylindrical portion, a first abutting portion provided at an axially upper surface of the cylindrical portion and abutting against the circuit board, and a first mounting hole extending in an axial direction provided at a central position of the axially upper surface of the cylindrical portion.

5. The air blowing device according to claim 4, wherein a plurality of ribs are provided on an outer peripheral surface of the cylindrical portion, and the plurality of ribs are arranged at equal intervals in a circumferential direction on the outer peripheral surface of the cylindrical portion.

6. The blower according to claim 4, wherein an outer peripheral surface of the first contact portion overlaps with a part of an outer peripheral surface of the cylindrical portion as viewed in an axial direction, surfaces on both sides in a circumferential direction of the first contact portion form second contact surfaces that contact the circuit board, and at least a part of a radially inner surface of the first contact portion forms a first contact surface that contacts the circuit board.

7. The blower device according to claim 6, wherein a fixing portion is formed at an edge of the circuit board, the fixing portion has a second contact portion and a mounting portion, the second contact portion has a third contact surface that contacts the first contact surface in a radial direction and a fourth contact surface that contacts the second contact surface in a circumferential direction, and the mounting portion has a second mounting hole that penetrates the circuit board and faces the first mounting hole in an axial direction.

8. The air supply arrangement of claim 7, wherein the diameter of the second mounting hole is larger than the diameter of the first mounting hole.

9. The air supply device according to claim 4, wherein a radially outer side of the first contact portion is located radially outward relative to an arc line formed on an outer periphery of the circuit board, as viewed in an axial direction.

10. The air supply device according to claim 4, wherein an axial height of the first abutting portion is smaller than an axial height of the circuit board as viewed in a radial direction.

11. The air supply device according to claim 4, wherein the number of the protruding portions is three, and the three protruding portions are arranged at equal intervals in a circumferential direction around a central axis of the motor.

12. The air supply device according to claim 4, wherein a lead wire outlet penetrating the lower case is provided in the lower case, and the air supply device further includes a rubber member sealing the lead wire outlet.

13. The air supply device according to claim 12, wherein the rubber member has a first main body portion having an area larger than an area of the wire lead-out opening, a connecting portion extending in an axial direction from at least a part of the first main body portion, and a second main body portion extending in a radial direction from the connecting portion, the area of the second main body portion is smaller than the area of the first main body portion, the first main body portion is located on a side of the lower case away from the circuit board, the second main body portion is located on a side of the lower case close to the circuit board, and a housing space for lead-out is formed between the first main body portion and the second main body portion.

14. The air supply device according to claim 12, wherein a lead regulating portion that regulates the lead wire drawn out from the lead wire drawing portion is provided on a side of the lower case away from the circuit board.

15. The air supply arrangement of claim 14, wherein the wire regulation portion has at least one radially extending radial regulation portion and at least one circumferentially extending circumferential regulation portion.