WO2021129223A1

WO2021129223A1 - Blower and ventilator

Info

Publication number: WO2021129223A1
Application number: PCT/CN2020/128612
Authority: WO
Inventors: 谢宗廷; 中田佑希
Original assignee: 日本电产科宝电子株式会社; 谢宗廷
Priority date: 2019-12-27
Filing date: 2020-11-13
Publication date: 2021-07-01
Also published as: CN113048095A

Abstract

Disclosed are a blower and a ventilator having the blower. The blower comprises an impeller (10) rotatable with a central axis as a center, a motor for driving the impeller to rotate, and a housing (20) for accommodating the impeller and the motor. The impeller comprises: a disc-shaped impeller disk (11); and a plurality of blades (12) provided on a surface on an axial side of the impeller disk, the plurality of blades extending in a radial direction; and radial outer ends of at least some of the blades are each provided with a protruding portion (13) protruding radially outward, and the protruding portion protrudes to the radial outer side of the impeller disk. Thus, the present invention can improve the blowing efficiency of the blower, reduce the running noise, and increase the windy area.

Description

Blower and ventilator

Technical field

The embodiments of the application relate to the field of electromechanics.

Background technique

In the existing blower (blower) design, there is a low pressure area in the exhaust part, and the wind entering from the low pressure area easily interferes with the wind discharged by the blower, thereby generating reverse flow, which affects the blowing efficiency of the blower. In addition, due to the presence of this low-pressure area, the operation noise of the blower is relatively large. On the other hand, the blow pressure of the fan of the blower is directly proportional to the windy area of the fan of the blower. However, although increasing the diameter of the fan can increase the windy area, it will not increase Too much windy area.

It should be noted that the above introduction to the technical background is only for the convenience of a clear and complete description of the technical solutions of the present application, and to facilitate the understanding of those skilled in the art. It should not be considered that the above technical solutions are well-known to those skilled in the art just because these solutions are described in the background art part of this application.

Summary of the invention

In order to solve at least one of the above-mentioned problems or other similar problems, embodiments of the present application provide a blower and a ventilator to improve the blowing efficiency of the blower, reduce operating noise, and increase the wind area.

According to an aspect of the embodiments of the present application, there is provided a blower including an impeller rotatable about a central axis, a motor that drives the impeller to rotate, and a housing accommodating the impeller and the motor, wherein, The impeller has:

A disc-shaped impeller disk; and

A plurality of blades provided on the surface of one axial side of the impeller disk, the plurality of blades extend in the radial direction;

At least part of the radially outer ends of the blades are provided with a protruding portion protruding to the radially outer side, and the protruding portion protrudes to the radially outer side of the impeller disk.

In one or more embodiments, the protrusions provided on adjacent blades at least partially overlap each other in the circumferential direction.

In one or more embodiments, the plurality of blades includes a plurality of first blades and a plurality of second blades, and the length of the first blades in the radial direction is different from the length of the second blades in the radial direction.

In one or more embodiments, the first blade and the second blade are arranged at intervals in the circumferential direction.

In one or more embodiments, the radially inner end of the first blade is closer to the radially inner side than the radially inner end of the second blade.

In one or more embodiments, the impeller disk includes a cup portion surrounding the central axis and a circular plate portion located on the outer periphery of the cup portion.

In one or more embodiments, the radially outer end of the protruding portion is closer to the radially outer side than the outer circumference of the circular plate portion.

In one or more embodiments, the circular plate portion and the cup portion are arranged in a gap, and are connected by the plurality of blades.

In one or more embodiments, the impeller is an integrally molded resin part.

In one or more embodiments, the axial height of the protrusion is different from the axial height of the radially outer end of the blade.

In one or more embodiments, the surface on the other side in the axial direction of the protrusion provided on the blade is closer to one side in the axial direction than the surface on the other side in the axial direction of the blade.

In one or more embodiments, a surface on one axial side of the protrusion provided on the blade is closer to the other side in the axial direction than a surface on one axial side of the blade.

In one or more embodiments, the surfaces on both sides in the axial direction of the protrusion provided on the blade are closer to the center line of the blade in the axial direction than the surfaces on both sides in the axial direction of the blade. .

In one or more embodiments, the surfaces on both sides of the axial direction of the protrusion provided on the blade are the same as the surfaces of both sides of the axial direction of the blade.

In one or more embodiments, at least one side in the axial direction of the radially outer end of the protrusion is a chamfered structure.

In one or more embodiments, the housing has a first housing and a second housing, and the first housing and the second housing are combined in the axial direction to form a circular air outlet and contain In the accommodating space of the impeller, the air outlet has an air guide and an air outlet, the air guide guides the wind from the impeller, the air outlet communicates with the air guide, and, The diameter of the air guide part is smaller than the diameter of the air outlet part.

In one or more embodiments, the air outlet direction of the air guide portion is consistent with the tangent direction of the outer circumference of the impeller disk.

In one or more embodiments, a stop part is formed at one end of the air outlet part close to the impeller.

According to another aspect of the embodiments of the present application, a blower is provided. The blower includes an impeller rotatable about a central axis, a motor that drives the impeller to rotate, and a housing accommodating the impeller and the motor, wherein ,

The impeller has an impeller disk and a plurality of blades arranged on a surface on one axial side of the impeller disk;

The housing has a first housing and a second housing, and the first housing and the second housing are combined in the axial direction to form a circular air outlet and an accommodation space for accommodating the impeller;

The air outlet has an air guide and an air outlet, the air guide guides the wind from the impeller, the air outlet communicates with the air guide, and the diameter of the air guide It is smaller than the diameter of the air outlet.

According to another aspect of the embodiments of the present application, a ventilator is provided, wherein the ventilator at least includes the above-mentioned blower.

One of the beneficial effects of the embodiments of the present application is that by designing the fan blades (blades) of the fan of the blower into an irregular shape, the wind area is increased without increasing the diameter of the fan. In addition, by modifying the structure of the exhaust part (air outlet) of the blower, the problem of reverse flow is avoided, the blowing efficiency of the blower is improved, and the operating noise is reduced.

With reference to the following description and drawings, specific implementations of the present application are disclosed in detail, and the ways in which the principles of the present application can be adopted are indicated. It should be understood that the scope of the embodiments of the present application is not limited thereby. Within the spirit and scope of the terms of the appended claims, the implementation of the present application includes many changes, modifications and equivalents.

Description of the drawings

The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the embodiments of the present application, and together with the text description, explain the principle of the present application. Obviously, the drawings in the following description are only some embodiments of the application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the attached picture:

Figure 1 is a schematic diagram of a blower in an embodiment of the present application;

Figure 2 is an exploded schematic diagram of the blower of the embodiment of the present application;

Figure 3 is a top view of the impeller of the blower of the embodiment of the present application;

Figure 4 is a bottom view of the impeller of the blower of the embodiment of the present application;

Figure 5 is a side view of the impeller of the blower of the embodiment of the present application;

FIG. 6 is an example diagram of the blade of the impeller shown in FIG. 5;

Fig. 7 is another schematic diagram of two adjacent blades.

Figure 8 is another schematic diagram of two adjacent blades;

Figure 9 is another schematic diagram of two adjacent blades;

Figure 10 is another schematic diagram of two adjacent blades;

Figure 11 is another schematic diagram of two adjacent blades;

Figure 12 is a bottom view of the first housing;

Figure 13 is a top view of the second housing;

Figure 14 is a schematic view of the impeller and the second housing;

15 is a schematic diagram of speed comparison between the existing blower and the blower of the embodiment of the present application;

Fig. 16 is a schematic diagram of acoustic comparison between the existing blower and the blower of the embodiment of the present application.

Detailed ways

With reference to the drawings, the foregoing and other features of this application will become apparent through the following description. In the specification and drawings, specific implementations of the application are specifically disclosed, which indicate some implementations in which the principles of the application can be adopted. It should be understood that the application is not limited to the described implementations. On the contrary, the present application is not limited to the described implementations. The application includes all modifications, variations and equivalents falling within the scope of the appended claims.

In the embodiments of the present application, the term "and/or" includes any one and all combinations of one or more of the associated listed terms. The terms "comprising", "including", "having" and the like refer to the existence of the stated features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components.

In the embodiments of the present application, the singular forms "a", "the", etc. may include plural forms, and should be broadly understood as "a" or "a type" rather than being limited to the meaning of "a"; in addition, the term " The "" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise. In addition, the term "based on" should be understood as "based at least in part on...", and the term "based on" should be understood as "based at least in part on...", unless the context clearly dictates otherwise.

In addition, in the following description of the present application, for the convenience of description, the direction parallel to the direction extending along the central axis OO' of the blower is referred to as the "axial direction", and the radial direction centered on the central axis OO' It is called "radial direction", and the direction around the central axis OO' is called "circumferential direction". However, it is worth noting that these are only for the convenience of explanation, and do not limit the orientation of the blower when it is used and manufactured.

The implementation of the embodiments of the present application will be described below with reference to the drawings.

Embodiments of the first aspect

The embodiment of the first aspect of the present application provides a blower.

Fig. 1 is a schematic diagram of a blower according to an embodiment of the present application, and Fig. 2 is an exploded view of the blower according to an embodiment of the present application. As shown in FIGS. 1 and 2, the blower of the embodiment of the present application includes an impeller 10 rotatable about a central axis OO', a motor (not shown) that drives the impeller 10 to rotate, and a housing 20 that accommodates the impeller 10 and the motor. .

Fig. 3 is a top view of the impeller 10, showing the situation viewed from the axial side of the impeller 10 (corresponding to the upper axial side shown in Fig. 2), and Fig. 4 is a bottom view of the impeller 10, showing the view from the impeller When viewed on the other side in the axial direction of 10 (corresponding to the lower side in the axial direction shown in FIG. 2 ), FIG. 5 is a side view of the impeller 10 and shows the state viewed from the radial direction of the impeller 10.

In the embodiment of the present application, as shown in FIGS. 2 to 5, the impeller 10 has a disc-shaped impeller disk 11 and a surface provided on the axial side of the impeller disk 11 (the upper axial side shown in FIG. 2). (For convenience of description, only two blades 12 are shown by reference numerals in FIGS. 2 to 5), and the plurality of blades 12 extend in the radial direction. In the embodiment of the present application, at least part of the radially outer ends of the blades 12 are provided with protrusions 13 protruding radially outward (for ease of description, only two protrusions 13 are indicated by reference numerals in FIGS. 2 to 5), The protrusion 13 protrudes to the radially outer side of the impeller disk 11.

With this structure, through the design of the protrusion 13, the fan blade of the blower fan is designed into an irregular shape, and the wind area is increased without increasing the diameter of the fan.

In some embodiments, as shown in FIG. 5, the protrusions 13 provided on adjacent blades 12 at least partially overlap each other in the circumferential direction. With this design, the windy area is increased, and the larger windy area increases the speed of air flow, thereby reducing the problem of backflow to a certain extent. In addition, the sound is no longer only distributed on a few blades, therefore, the overall noise is reduced.

In some embodiments, as shown in FIG. 3, the plurality of blades 12 includes a plurality of first blades 12-1 and a plurality of second blades 12-2. The length of the first blade 12-1 in the radial direction is the same as that of the second blade 12-1. The length of 12-2 in the radial direction is different. For example, the radial length of the first blade 12-1 is greater than the radial length of the second blade 12-2. As a result, more blades can be provided on the impeller disk 11 with a limited area to increase the windy area, thereby improving the blowing efficiency.

In some embodiments, as shown in FIG. 3, the first blade 12-1 and the second blade 12-2 are arranged at intervals in the circumferential direction, that is, the first blade 12-1 and the second blade 12-2 are arranged adjacent to each other, The blade adjacent to the first blade 12-1 is the second blade 12-2, or in other words, the blade adjacent to the second blade 12-2 is the first blade 12-1. Thus, the balance of the impeller 10 can be ensured.

In some embodiments, as shown in FIG. 3, the radially inner end A of the first blade 12-1 is closer to the radially inner side than the radially inner end B of the second blade 12-2. As a result, more blades can be provided on the impeller disk 11 with a limited area to increase the windy area, thereby improving the blowing efficiency.

In some embodiments, as shown in FIG. 5, the axial height h1 of the protrusion 13 is different from the axial height h1' of the radially outer end of the blade 12, thereby making the radially outer end of the blade 12 an irregular shape. , Further reducing the total noise.

In some embodiments, as shown in FIG. 5, the surface of the protrusion 13 provided on the first blade 12-1 on the other axial side (the lower axial side shown in FIG. 5) is larger than the surface of the first blade 12- The surface on the other side in the axial direction of 1 (the lower side in the axial direction shown in FIG. 5) is closer to one side in the axial direction (the upper side in the axial direction shown in FIG. 5). Thereby, a structure in which the lower side of the radially outer end of the first blade 12-1 is recessed is formed.

In some embodiments, as shown in FIG. 5, the surface of the protrusion 13 provided on the second blade 12-2 on the axial side (the upper axial side shown in FIG. 5) is larger than the surface of the second blade 12-2. The surface on one axial side (the upper axial side shown in FIG. 5) is closer to the other axial side (the lower axial side shown in FIG. 5). Thus, a structure in which the upper side of the radially outer end of the second blade 12-2 is recessed is formed.

FIG. 6 schematically shows the structure of the first blade 12-1 and the second blade 12-2 shown in FIG. 5, but the present application is not limited to this. The structure of the protrusion 13 may also be arranged on the blade The surfaces on both sides of the protrusion 13 on the axial direction of the blade 12 are closer to the centerline of the blade 12 in the axial direction than the surfaces on both sides of the blade 12 in the axial direction, that is, a recessed structure is formed on both sides of the blade 12 in the axial direction; or The surfaces of the protrusions 13 provided on the blade 12 on both sides in the axial direction are the same as the surfaces on both sides in the axial direction of the blade 12, that is, no recessed structure is formed on both sides of the blade 12 in the axial direction.

FIG. 7 is a schematic diagram of another structure of two adjacent blades 12. In the example of FIG. 7, the structure of one blade 12 is the same as the structure of the first blade 12-1 shown in FIG. ), the structure of the other blade 12 is that the surfaces on both sides of the projection 13 in the axial direction are closer to the centerline CC' (axial direction) of the second blade 12 than the surfaces on both sides of the second blade 12 in the axial direction. Depressed on both sides).

FIG. 8 is a schematic diagram of another structure of two adjacent blades 12. In the example of FIG. 8, the structure of one blade 12 is the same as the structure of the second blade 12-2 shown in FIG. 6 (the upper side is recessed in the axial direction). ), the structure of the other blade 12 is that the surfaces on both sides of the projection 13 in the axial direction are closer to the centerline CC' (axial direction) of the second blade 12 than the surfaces on both sides of the second blade 12 in the axial direction. Depressed on both sides).

FIG. 9 is a schematic diagram of another structure of two adjacent blades 12. In the example of FIG. 9, one blade 12 has protrusions 13, and the protrusions 13 are provided on the surfaces of the protrusions 13 on both sides of the blade 12 in the axial direction. It is the same as the surfaces on both sides of the blade 12 in the axial direction (both sides in the axial direction are not recessed); the other blade does not have the protrusion 13.

FIG. 10 is a schematic diagram of another structure of two adjacent blades 12. In the example of FIG. 10, one blade 12 has a protrusion 13, and the structure of the blade 12 is similar to that of the second blade 12-2 shown in FIG. The structure is the same (the upper side is recessed in the axial direction); the other blade does not have the protrusion 13. The present application is not limited to this. In the example of FIG. 10, the structure of the blade with the protrusion 13 may also be the same as the structure of the first blade 12-1 shown in FIG. The structure is the same as that of the blades 12 recessed on both sides as shown in FIG. 8.

In some embodiments, at least one side in the axial direction of the radially outer end of the protrusion 13 may be formed as a chamfered structure. FIG. 11 shows two blades 12, wherein one blade 12 is radially outward of the protrusion 13 A chamfered structure R is formed on the axial upper side of the end, and a chamfered structure R is formed on the axial lower side of the protrusion 13 of the other blade 12. As a result, noise can be reduced.

In some embodiments, as shown in FIGS. 2 to 4, the impeller disk 11 includes a cup portion 111 surrounding the central axis OO' and a circular plate portion 112 located on the outer periphery of the cup portion 111. In some embodiments, the radially outer end of the protruding portion 13 is closer to the radially outer side than the outer circumference of the circular plate portion 112, that is, the protruding portion 13 extends to the radially outer side of the circular plate portion 112. In some embodiments, the disc portion 112 and the cup portion 111 are arranged with a gap and are connected by a plurality of blades 12, that is, the disc portion 112 is formed in a ring shape, and the cup portion 111 is formed with a central part facing the other side in the axial direction. (Upper side in the axial direction shown in Fig. 2) protrudes. Thus, the stable operation of the blade 12 can be ensured.

In the embodiment of the present application, the impeller 10 is an integrally formed resin part. The present application is not limited to this. The impeller 10 may also be an integrally formed part made of other implementable materials. Thus, it is easy to form the above-mentioned structure.

In the embodiment of the present application, as shown in FIG. 2, the housing 20 has a first housing 21 and a second housing 22. The first housing 21 and the second housing 22 are combined with each other in the axial direction to form a circular shape. The air outlet 23 and the accommodating space 24 for accommodating the impeller 10 (see FIGS. 12 and 13).

FIG. 12 is a bottom view of the first housing 21, showing a situation viewed from the lower side of the axial direction shown in FIG. 2; FIG. 13 is a plan view of the second housing 22, showing a view from the shaft shown in FIG. Look at the situation upwards. As shown in Figures 12 and 13, the air outlet 23 has an air guide 231 and an air outlet 232. The air guide 231 guides the wind from the impeller 10, the air outlet 232 communicates with the air guide 231, and the air guide The diameter d1 of the portion 231 is smaller than the diameter d2 of the air outlet portion 232. By forming the air guide portion 231 and the air outlet portion 232, the low pressure area in the blower is reduced, and the reverse flow is reduced. As a result, the noise can be distributed on more blades 12 and the total noise on the blades 12 is reduced. .

In some embodiments, as shown in FIGS. 12 and 13, a stopper 233 is formed at one end of the air outlet 232 close to the impeller 10, and the stopper 233 can prevent the airflow entering from the air outlet 23 from entering the interior of the impeller 10. , Thereby causing interference with the wind blowing from the impeller 10. As a result, the backflow is further reduced.

FIG. 14 is a schematic diagram of the impeller 10 and the second casing 22. As shown in FIG. 14, in some embodiments, the wind direction of the air guide portion 231 is consistent with the tangential direction D of the outer circumference of the impeller disk 11. As a result, the low pressure area in the blower is reduced, thereby reducing the backflow and improving the blowing efficiency of the blower.

FIG. 15 is a schematic diagram of speed comparison between the existing blower and the blower of the embodiment of the present application. It can be seen from FIG. 15 that, compared with the existing blower, the blower of the embodiment of the present application reduces the backflow. FIG. 16 is a schematic diagram of acoustic comparison between the existing blower and the blower of the embodiment of the present application. It can be seen from FIG. 16 that the blower of the embodiment of the present application reduces noise.

The following Table 1 shows the comparison of pressure and noise between the blower of the embodiment of the present application and the existing blower at 28100 rpm and 25300 rpm.

Table 1

It can be seen from Table 1 that at 28100 rpm, the blowing pressure of the blower in the embodiment of the present application can reach 29.73 cm-water, which can reduce the noise of 7.7 dB. At 25300rpm, the noise of 10.3dB can be reduced, and the blowing pressure is maintained at approximately 24cm-water.

In the above embodiments, only the structure related to the blower of the embodiment of the present application is described, and the present application is not limited to this. The blower may also include other structures. For details, reference may be made to related technologies, and details are not repeated here. In addition, the embodiment of the present application does not limit the structure of the blower motor. For details, reference may be made to related technologies, which will not be repeated here.

In the above embodiments, by designing the fan blades (blades) of the fan of the blower into an irregular shape, the wind area is increased without increasing the diameter of the fan. In addition, by modifying the structure of the exhaust part (air outlet) of the blower, the problem of reverse flow is avoided, the blowing efficiency of the blower is improved, and the operating noise is reduced.

Embodiment of the second aspect

An embodiment of the second aspect of the present application provides a blower that includes an impeller that is rotatable about a central axis, a motor that drives the impeller to rotate, and a housing that accommodates the impeller and the motor.

In the embodiment of the present application, the impeller has an impeller disk and a plurality of blades arranged on the surface of the axial side of the impeller disk; the outer shell has a first shell and a second shell, and the first shell and the second shell are in The air outlet is combined in the axial direction to form a circular air outlet and an accommodation space for accommodating the impeller; the air outlet has an air guiding part and an air outlet, the air guiding part guides the wind from the impeller, and the air outlet is connected with the air guiding part, and , The diameter of the air guiding part is smaller than the diameter of the air outlet.

In the embodiments of the present application, the structure of the impeller is not limited, and the structure of the impeller in the embodiment of the first aspect may also be other structures, which will not be repeated here.

In the embodiment of the present application, the structure of the housing is the same as the structure of the embodiment of the first aspect, and the content of the housing is merged here, and will not be repeated here. For example, the air outlet direction of the air guide portion is consistent with the tangent direction of the outer circumference of the impeller disk. For another example, a stop portion is formed at one end of the air outlet portion close to the impeller. For details, please refer to the embodiment of the first aspect.

In the above embodiments, by modifying the structure of the exhaust part (air outlet) of the blower, the problem of reverse flow is avoided, the blowing efficiency of the blower is improved, and the operating noise is reduced.

Embodiments of the third aspect

The embodiment of the third aspect of the present application provides a ventilator having the blower described in the embodiment of the first aspect or the blower described in the embodiment of the second aspect. Since in the embodiments of the first aspect and the second aspect, the structure of the blower has been described in detail, the content is incorporated herein, and the description is omitted here.

According to the embodiment of the present application, by designing the fan blades (blades) of the fan of the blower into an irregular shape, the wind area is increased without increasing the diameter of the fan. In addition, by modifying the structure of the exhaust part (air outlet) of the blower, the problem of reverse flow is avoided, the blowing efficiency of the blower is improved, and the operating noise is reduced.

It is worth noting that the above only exemplifies the application, but the application is not limited to this, and appropriate modifications can also be made on the basis of each of the above embodiments. In addition, each component is only exemplified above, but the application is not limited to this, and the specific content of each component can also refer to related technologies; in addition, components not shown in FIG. 1 may be added, or components in FIG. 1 may be reduced. One or more components.

The application is described above in conjunction with specific implementations, but it should be clear to those skilled in the art that these descriptions are all exemplary and do not limit the scope of protection of the application. Those skilled in the art can make various variations and modifications to the application according to the spirit and principle of the application, and these variations and modifications are also within the scope of the application.

The preferred embodiments of the present application have been described above with reference to the accompanying drawings. Many features and advantages of these embodiments are clear from the detailed description, and therefore the appended claims are intended to cover all these features and advantages of these embodiments that fall within their true spirit and scope. In addition, since those skilled in the art can easily think of many modifications and changes, the implementation of the present application is not limited to the precise structure and operation illustrated and described, but can cover all suitable modifications and equivalents falling within its scope. Things.

Claims

A blower comprising an impeller rotatable with a central axis as the center, a motor that drives the impeller to rotate, and a housing accommodating the impeller and the motor, characterized in that:

The impeller has:

A disc-shaped impeller disk; and

A plurality of blades provided on the surface of one axial side of the impeller disk, the plurality of blades extend in the radial direction;

At least part of the radially outer ends of the blades are provided with a protruding portion protruding to the radially outer side, and the protruding portion protrudes to the radially outer side of the impeller disk.
The blower according to claim 1, wherein the protrusions provided on the adjacent blades at least partially overlap each other in the circumferential direction.
The blower according to claim 1, wherein the plurality of blades includes a plurality of first blades and a plurality of second blades, and the length of the first blades in the radial direction is the same as that of the second blades in the radial direction. The length is different.
The blower according to claim 3, wherein the first blade and the second blade are spaced apart in the circumferential direction.
The blower according to claim 3, wherein the radially inner end of the first blade is closer to the radially inner side than the radially inner end of the second blade.
The blower according to claim 1, wherein the impeller disk includes a cup part surrounding the central axis and a circular plate part located on an outer periphery of the cup part.
The blower according to claim 6, wherein the radially outer end of the protruding portion is located further radially outward than the outer circumference of the circular plate portion.
The blower according to claim 6, wherein the circular plate portion and the cup portion are arranged in a gap, and are connected by the plurality of blades.
The blower according to claim 1, wherein the impeller is an integrally molded resin part.
The blower according to claim 1, wherein the axial height of the protrusion is different from the axial height of the radially outer end of the blade.
The blower according to claim 1, wherein:

The surface on the other side in the axial direction of the protrusion provided on the blade is closer to one side in the axial direction than the surface on the other side in the axial direction of the blade; or

The surface on one side in the axial direction of the protrusion provided on the blade is closer to the other side in the axial direction than the surface on one side in the axial direction of the blade; or

The surfaces on both sides of the protrusion provided on the blade in the axial direction are closer to the center line of the blade in the axial direction than the surfaces on both sides of the axial direction of the blade; or

The surfaces on both sides in the axial direction of the protrusion provided on the blade are the same as the surfaces on both sides in the axial direction of the blade.
The blower according to claim 1, wherein at least one axial side of the radially outer end of the protruding portion is a chamfered structure.
The blower according to claim 1, wherein the housing has a first housing and a second housing, and the first housing and the second housing are combined in the axial direction to form a circular shape. An air outlet and an accommodating space for accommodating the impeller, the air outlet having an air guiding part and an air outlet, the air guiding part guides the wind from the impeller, the air outlet and the air guiding part Are connected, and the diameter of the air guide part is smaller than the diameter of the air outlet part.
The blower according to claim 13, wherein the air outlet direction of the air guide portion is consistent with the tangent direction of the outer circumference of the impeller disk.
The blower according to claim 13, wherein a stop portion is formed at an end of the air outlet portion close to the impeller.
A blower comprising an impeller rotatable with a central axis as the center, a motor that drives the impeller to rotate, and a housing accommodating the impeller and the motor, characterized in that:

The impeller has an impeller disk and a plurality of blades arranged on a surface on one axial side of the impeller disk;

The housing has a first housing and a second housing, and the first housing and the second housing are combined in the axial direction to form a circular air outlet and an accommodation space for accommodating the impeller;

The air outlet has an air guide and an air outlet, the air guide guides the wind from the impeller, the air outlet communicates with the air guide, and the diameter of the air guide It is smaller than the diameter of the air outlet.
The blower according to claim 16, wherein the air outlet direction of the air guide portion is consistent with the tangent direction of the outer circumference of the impeller disk.
The blower according to claim 16, wherein a stop portion is formed at an end of the air outlet portion close to the impeller.
A ventilator, characterized in that the ventilator comprises the blower according to any one of claims 1 to 18.