CN216131142U

CN216131142U - Impeller of fan, fan and air conditioner

Info

Publication number: CN216131142U
Application number: CN202121154777.5U
Authority: CN
Inventors: 于兆志; 赵继斌
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2022-03-25
Anticipated expiration: 2031-05-26

Abstract

The application relates to the technical field of household appliances and discloses an impeller of a fan, the fan and an air conditioner. The impeller includes: the blade assembly comprises a plurality of blades which are arranged at intervals by taking the axis of the impeller as the center; the hub is arranged on the blade assembly and is connected with the plurality of blades; the impeller comprises a blade assembly, a plurality of hubs and a blade, wherein the number of the hubs is multiple, the hubs are sequentially arranged along the axis of the impeller at intervals, and the outer diameter of at least one of the hubs is smaller than that of the blade assembly. The outer diameter of the hub is smaller than that of the blade assembly, so that when the impeller works, the wind speed at the hub is smaller than that at the blade assembly, the flow velocity of airflow generated at the hub is smaller than that at the blade assembly, collision and friction between the airflow at the hub and other parts of the fan are reduced, and noise and abnormal sound of the fan are reduced.

Description

Impeller of fan, fan and air conditioner

Technical Field

The present application relates to the field of household appliance technologies, and for example, to an impeller of a fan, and an air conditioner.

Background

At present, when an impeller of an existing fan rotates, generated high-speed airflow collides with parts of the fan, or the high-speed airflow rubs the surrounding wall surface to cause abnormal sound and noise.

SUMMERY OF THE UTILITY MODEL

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides an impeller of a fan, the fan and an air conditioner, which are used for solving the problems of abnormal sound and noise caused by the rotation of the existing impeller of the fan.

The disclosed embodiment provides an impeller of a fan, the impeller includes: the blade assembly comprises a plurality of blades which are arranged at intervals by taking the axis of the impeller as the center; the hub is arranged on the blade assembly and is connected with the plurality of blades; the impeller comprises a blade assembly, a plurality of hubs and a blade, wherein the number of the hubs is multiple, the hubs are sequentially arranged along the axis of the impeller at intervals, and the outer diameter of at least one of the hubs is smaller than that of the blade assembly.

Optionally, the outer circumferential surface of said at least one of said plurality of hubs is connected to the innermost of said plurality of blades.

Optionally, the at least one of the plurality of hubs includes a first hub provided at an end of the blade assembly in an axial direction of the impeller.

Optionally, the first hub comprises a connecting shaft, the connecting shaft is located on an outer surface of the first hub facing away from the blade assembly, and the connecting shaft extends along the axis of the impeller in a direction facing away from the blade assembly; wherein the length of the connecting shaft is proportional to the outer diameter of the first hub.

Optionally, the at least one of the plurality of hubs includes a first hub provided between both ends of the blade assembly in the axial direction of the impeller.

Optionally, the plurality of hubs further comprises a second hub having an outer diameter greater than or equal to the outer diameter of the blade assembly.

Embodiments of the present disclosure also provide a fan including an impeller of the fan as described in any of the above embodiments.

Optionally, the fan further comprises a housing defining an air channel, the impeller portion being located within the air channel; the shell is provided with a concave hole, the connecting shaft is located in the concave hole, and the length of the connecting shaft is in direct proportion to the depth of the concave hole.

Optionally, the fan further comprises: the casing defines the wind channel, and the impeller is all located in the wind channel.

The embodiment of the present disclosure also provides an air conditioner, including the fan as described in any one of the above embodiments.

The impeller of the fan, the fan and the air conditioner provided by the embodiment of the disclosure can realize the following technical effects:

the outer diameter of the hub is smaller than that of the blade assembly, so that when the impeller works, the wind speed at the hub is smaller than that at the blade assembly, the flow velocity of the airflow generated at the hub is smaller than that of the airflow generated at the blade assembly, collision and friction between the airflow at the hub and other parts of the fan are reduced, and noise and abnormal sound of the fan are reduced.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

FIG. 1 is a schematic structural view of a perspective of an impeller provided by embodiments of the present disclosure;

FIG. 2 is a schematic structural view from another perspective of an impeller provided by embodiments of the present disclosure;

FIG. 3 is a schematic view of a fan according to an embodiment of the present disclosure;

FIG. 4 is a schematic cross-sectional view taken along line B-B of FIG. 3;

FIG. 5 is a schematic view of another perspective of a fan according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of another view angle of a fan according to an embodiment of the present disclosure.

Reference numerals:

10. a fan; 20. an impeller; 201. a blade assembly; 2011. a blade; 2012. the innermost side of the blade; 2013. the outer side of the blade; 202. a hub; 2021. a first hub; 2022. a second hub; 2023. a connecting shaft; 2024. concave holes; 30. a housing; 301. a framework; 302. a motor cover plate; 303. a plastic tube sheet.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.

The term "plurality" means two or more unless otherwise specified.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

The first embodiment is as follows:

as shown in fig. 1 to 6, an embodiment of the present disclosure provides an impeller 20 of a fan 10, where the impeller 20 includes a blade assembly 201 and a hub 202, the blade assembly 201 includes a plurality of blades 2011, and the plurality of blades 2011 are spaced apart from each other by taking an axis of the impeller 20 as a center; the hub 202 is arranged on the blade assembly 201 and is connected with a plurality of blades 2011; wherein, the quantity of wheel hub 202 is a plurality of, and a plurality of wheel hubs 202 are along the axis of impeller 20 interval setting in proper order, and the external diameter of at least one in a plurality of wheel hubs 202 is less than the external diameter of blade subassembly 201.

The blades 2011 are spaced by taking the axis of the impeller 20 as the center, so that when the fan 10 works, the impeller 20 is driven to rotate, the blades 2011 are driven to rotate by taking the axis of the impeller 20 as the center, when the impeller 20 of the fan 10 rotates by taking the axis of the impeller 20 as the center, the impeller 20 generates airflow, the airflow collides with other parts of the fan 10, abnormal sound or noise is generated, because the outer diameter of the hub 202 is smaller than that of the blade assembly 201, the wind speed at the hub 202 is lower than that at the blade assembly 201, and the airflow generated at the hub 202 is smaller than that of the blade assembly 201, thus, the noise generated by collision of the airflow at the hub 202 with other parts of the fan 10 can be reduced, and further, the noise of the whole fan 10 during working is reduced.

Here, the outer diameter of the hub 202 refers to the diameter of the hub 202 in the direction perpendicular to the axis of the impeller 20, and the outer diameter of the blade assembly 201 refers to the diameter of the blade assembly 201 in the direction perpendicular to the axis of the impeller 20.

Alternatively, the fan 10 may be an axial fan or a cross flow fan.

When the fan 10 is a cross flow fan, the cross flow fan blows air in the axial direction of the impeller 20 by the plurality of rotating blades 2011. When viewed from the axial direction of the impeller 20, the cross flow fan sucks air from the outer space on one side into the inner space of the cross flow fan with respect to the axial direction of the impeller 20, and sends out the sucked air to the outer space on the other side with respect to the axial direction of the impeller 20. The cross flow fan forms an air flow in a plane perpendicular to the axial direction of the impeller 20, and the air flow flows in a direction intersecting the axial direction of the impeller 20. The cross flow fan forms a planar blown air flow parallel to the axial direction of the impeller 20.

Alternatively, the cross flow fan is used at a rotational speed suitable for a low reynolds number region of the household electric appliance such as the fan 10.

Alternatively, the plurality of blades 2011 have the same shape, and the plurality of blades 2011 extend in the same direction.

Since the plurality of blades 2011 are circumferentially spaced around the axis of the impeller 20 and the plurality of blades 2011 are circumferential, the plurality of blades 2011 have an inner circumferential surface and an outer circumferential surface, the inner circumferential surface is located inside the impeller 20, the outer circumferential surface is located outside the impeller 20, and the plurality of blades 2011 are inclined from the inner circumferential surface to the outer circumferential surface in the circumferential direction of the axis of the impeller 20. The blades 2011 are inclined from the inner circumferential surface toward the outer circumferential surface in the rotation direction of the cross flow fan 10.

The blade 2011 is formed with an airfoil that is configured by a positive pressure surface and a negative pressure surface. The positive pressure surface is disposed on the rotation direction side of the impeller 20, and the negative pressure surface is disposed on the back surface side of the positive pressure surface. When the impeller 20 rotates, an airflow is generated on the airfoil, and a pressure distribution that is relatively large on a positive pressure surface and relatively small on a negative pressure surface is generated. The vane 2011 has a shape that is entirely curved such that the positive pressure surface side is concave and the negative pressure surface side is convex between the inner circumferential surface and the outer circumferential surface.

The cross section of the impeller 20 when cut at any position on the axis of the impeller 20 has the same cross-sectional shape of the blade 2011. The blade 2011 has a thin-walled blade 2011 cross-sectional shape. The blade 2011 has a substantially constant thickness (a length between the positive pressure surface and the negative pressure surface) between the inner circumferential surface and the outer circumferential surface.

Alternatively, the plurality of blades 2011 are arranged at random intervals centering on the axis of the impeller 20, such as by arranging the plurality of blades 2011 at unequal intervals in a normal distribution with a random number.

Optionally, an outer circumferential surface of at least one of the plurality of hubs 202 is connected to an innermost side 2012 of the plurality of blades.

In the case that the plurality of hubs 202 are connected to the plurality of blades 2011, at least one of the plurality of hubs 202 is connected to the innermost 2012 of the plurality of blades, so that the outer diameter of the hub 202 can be reduced to a minimum value, thereby reducing the wind speed at the hub 202 to the maximum extent and reducing the airflow at the hub 202 to the maximum extent to reduce the noise at the hub 202.

As shown in fig. 2, the outboard side 2013 of the blade is located outboard of the innermost side 2012 of the blade.

At least one of the plurality of hubs 202 includes a first hub 2021, and the first hub 2021 is provided at an end of the blade assembly 201 in the axial direction of the impeller 20.

The end of the blade assembly 201 contacts with more other components of the fan 10, so that when the impeller 20 rotates, the noise at the end of the blade assembly 201 is larger, and the first hub 2021 is disposed at the end of the blade assembly 201 along the axial direction of the impeller 20, so as to reduce the wind speed at the end of the blade assembly 201 (which can be understood as the end of the impeller 20), further reduce the airflow generated at the end of the impeller 20, reduce the collision between the airflow at the end of the impeller 20 and other components of the fan 10, and further reduce the noise of the impeller 20.

Alternatively, the first hub 2021 may be provided at one end or both ends of the blade assembly 201 in the axial direction of the impeller 20.

Optionally, the first hub 2021 is removably attached to the blade assembly 201.

For example, the first hub 2021 and blade assembly 201 may be snap-fit or screw-fit.

Optionally, when the first hub 2021 and the blade assembly 201 are connected by a snap fit, one of the first hub 2021 and the blade assembly 201 is provided with a protrusion, the other of the first hub 2021 and the blade assembly 201 is provided with a groove, the protrusion is adapted to the groove, and when the protrusion is located in the groove, the first hub 2021 is connected to the blade assembly 201.

Optionally, when the first hub 2021 and the blade assembly 201 are connected by screws, the first hub 2021 has a first screw hole, the blade assembly 201 has a second screw, and the screws pass through the first screw hole and the second screw hole to connect the first hub 2021 and the blade assembly 201.

Optionally, the first hub 2021 is disposed between two ends of the blade assembly 201 in the axial direction of the impeller 20.

The first hub 2021 is provided between the two ends of the blade assembly 201 in the axial direction of the impeller 20, so that the wind speed is reduced at the first hub 2021 between the two ends of the blade assembly 201, the noise is reduced, and the noise of the fan 10 is further reduced.

Alternatively, the number of the first hubs 2021 of the blade assembly 201 between both ends in the axial direction of the impeller 20 may be one or more, the outer diameter of the first hub 2021 may be smaller than the outer diameter of the blade assembly 201 when the number of the first hubs 2021 between the both ends is one, and the plurality of first hubs 2021 may be sequentially spaced along the axis of the impeller 20 when the number of the first hubs 2021 between the both ends is plural.

As shown in fig. 1, the plurality of hubs 202 also includes a second hub 2022, the outer diameter of the second hub 2022 being greater than or equal to the outer diameter of the blade assembly 201.

The outer diameter of the second hub 2022 is greater than or equal to the outer diameter of the blade assembly 201, so that the strength and stability of the impeller 20 can be ensured, and the service life of the impeller 20 can be ensured.

Alternatively, the second hub 2022 may be located at an end of the blade assembly 201 along the axis of the impeller 20, or between two ends of the blade assembly 201 along the axis of the impeller 20.

As shown in fig. 1, the blade assembly 201 is provided with a first hub 2021 at both ends along the axis of the impeller 20, and a second hub 2022 is provided between the both ends.

As shown in fig. 3, embodiments of the present disclosure also provide a fan 10 including the impeller 20 of the fan 10 of any one of the above embodiments.

The fan 10 provided in the embodiment of the present disclosure includes the impeller 20 of the fan 10 in any one of the above embodiments, so that all the beneficial effects of the impeller 20 of the fan 10 in any one of the above embodiments are achieved, and details are not described herein again.

As shown in fig. 1, 3 and 4, the first hub 2021 includes a connecting shaft 2023, the connecting shaft 2023 is located on an outer surface of the first hub 2021 facing away from the blade assembly 201, and the connecting shaft 2023 extends along an axis of the impeller 20 in a direction facing away from the blade assembly 201; wherein the length of the connecting shaft 2023 is proportional to the outer diameter of the first hub 2021.

The casing 30 of the fan 10 includes a skeleton 301, a motor cover plate 302 and a plastic tube plate 303, and the motor cover plate 302 and the plastic tube plate 303 are respectively located at two sides of the skeleton 301.

In the conventional fan 10, the outer diameters of the hubs 202 at the two ends of the fan 10 along the axial direction of the impeller 20 are larger than the outer diameter of the blade assembly 201, and in order to prevent abnormal noise, the hubs 202 at the two ends of the fan 10 need to be respectively embedded in the plastic tube plate 303 and the motor gland and the framework 301, because the wind speed at the hubs 202 at the two ends of the fan 10 is high and the high wind speed region has a certain width, the embedding depth needs to be deep enough, that is, the length of the connecting shaft 2023 needs to be long enough, the overall size of the fan 10 is increased, and the cost is increased. In addition, in the production and assembly, if the fan 10 is deviated left and right, the abnormal sound is still easy to appear at one end, and the generation of the abnormal sound cannot be avoided.

In this embodiment, since the impeller 20 still generates noise when rotating, in order to reduce the noise, the first hubs 2021 located at the two ends of the impeller 20 along the axial direction of the impeller 20 need to be embedded in the casing 30 of the fan 10, and further reduce the noise of the fan 10, in order to facilitate the embedding of the first hubs 2021 in the casing 30, the first hubs 2021 include the connecting shaft 2023, the first hubs 2021 are embedded in the casing 30, and the length of the connecting shaft 2023 is proportional to the outer diameter of the first hubs 2021. It can be understood that: the smaller the outer diameter of the first hub 2021 is, the shorter the length of the connecting shaft 2023 is, which can save the manufacturing cost of the first hub 2021 and reduce the volume of the fan 10.

As shown in fig. 4, 5 and 6, the fan 10 further includes a housing 30, the housing 30 defining an air channel, the impeller 20 being partially located in the air channel; the housing 30 has a recess 2024, the connecting shaft 2023 is disposed in the recess 2024, and the length of the connecting shaft 2023 is proportional to the depth of the recess 2024.

In order to facilitate the embedding of the first hubs 2021 at the two ends of the fan 10 into the plastic tube sheet 303 and the motor gland and the frame 301, and the recess 2024 that can be enclosed by the plastic tube sheet 303 and the motor gland and the frame 301, the depth of the recess 2024 needs to be deep enough and the diameter of the recess 2024 needs to be large enough to embed the first hubs 2021 deep enough, otherwise the high-speed airflow may collide or rub the surrounding wall surface to cause noise.

In order to facilitate the first hub 2021 to be embedded in the housing 30 of the fan 10, the housing 30 is provided with a concave hole 2024 at a position corresponding to the connecting shaft 2023, so that the connecting shaft 2023 can be inserted conveniently, and the depth of the concave hole 2024 is proportional to the length of the connecting shaft 2023, when the length of the connecting shaft 2023 is reduced, the depth of the concave hole 2024 is gradually reduced, so that the space occupied by the concave hole 2024 in the housing 30 is reduced, and the stability of the fan 10 is improved.

Optionally, when the first hubs 2021 are located at two ends of the blade assembly 201 along the axis of the impeller 20, the number of the first hubs 2021 is two, and each of the two first hubs 2021 includes the connecting shaft 2023, wherein one end of the blade assembly 201 is provided with a first sub-hub, and the first hub 2021 includes a first sub-hub including a first connecting shaft, and the length of the first connecting shaft is proportional to the outer diameter of the first sub-hub, that is, the length of the first connecting shaft decreases as the outer diameter of the first sub-hub decreases.

Skeleton 301 prescribes a limit to the wind channel, and 20 parts of impeller are located the wind channel, and motor cover plate 302 is located the one end of blade assembly 201, and skeleton 301 encloses with motor cover plate 302 and closes and form first shrinkage pool, and shrinkage pool 2024 includes first shrinkage pool, and the degree of depth of first shrinkage pool is directly proportional with the length of first connecting shaft, can understand: the depth of the first recessed hole decreases as the length of the first connecting shaft decreases.

Optionally, the other end of the blade assembly 201 is provided with a second sub-hub, the first hub 2021 comprises a second sub-hub, the second sub-hub comprises a second connecting shaft, and the length of the second connecting shaft is proportional to the outer diameter of the second sub-hub, i.e. the length of the second connecting shaft decreases as the outer diameter of the second sub-hub decreases.

Skeleton 301 prescribes a limit to the wind channel, and 20 parts of impeller are located the wind channel, and plastics tube sheet 303 is located the other end of blade subassembly 201, and skeleton 301 encloses with plastics tube sheet 303 and closes and form the second shrinkage pool, and shrinkage pool 2024 includes the second shrinkage pool, and the degree of depth and the length of second connecting axle of second shrinkage pool are directly proportional, can understand: the depth of the second concave hole decreases as the length of the second connecting shaft decreases.

Optionally, the fan 10 further comprises a motor drivingly connected to the impeller 20 for driving the impeller 20 in rotation.

The embodiment of the present disclosure also provides an air conditioner, including the fan 10 in any one of the above embodiments.

The air conditioner provided in the embodiment of the present disclosure includes the fan 10 in any one of the above embodiments, so that all the beneficial effects of the fan 10 in any one of the above embodiments are achieved, and details are not described herein.

Optionally, the air conditioner comprises an indoor unit, and the indoor unit comprises the fan 10.

Optionally, the indoor unit is a wall-mounted indoor unit.

Optionally, the housing 30 further comprises a shell and a front panel. The casing is supported by the indoor wall surface, and the front panel is detachably mounted on the casing. The gap between the lower end of the front panel and the lower end of the housing forms an air outlet. The outlet is substantially rectangular extending in the width direction of the indoor unit, and is disposed to face the front lower side, and a lattice-shaped air inlet is formed on the upper surface of the front panel.

An air filter is provided at a position facing the front panel to collect and remove dust contained in air sucked through the suction port. An air filter cleaning device is disposed in a space formed between the front panel and the air filter. The dust accumulated on the air filter is automatically removed by the air filter cleaning device.

An air duct is formed inside the housing 30, and the air duct causes air to flow from the air inlet toward the air outlet. The air outlet is provided with a vertical louver board which can change the blowing angle in the left and right directions; and a plurality of horizontal louvers capable of changing the blowing angle in the vertical direction to the front upper side, the horizontal direction, the front lower side, and the right lower side.

Optionally, a heat exchanger is provided between the air filter and the fan 10.

Example two:

the difference from the first embodiment is that:

the housing 30 of the fan 10 defines an air outlet channel, and the impeller 20 is located entirely within the air channel.

When the outer diameter of the first hub 2021 is small enough to make the wind speed at the two ends of the fan 10 along the axial direction of the impeller 20 small enough, the first hub 2021 does not need to be buried in the casing 30, and the connecting shaft 2023 and the concave hole 2024 do not need to be provided, so that the impeller 20 is located in the wind channel, the manufacturing cost of the fan 10 is reduced, the volumes of the casing 30 such as the fan 10 and the frame 301 are also reduced, and the impeller 20 does not occupy too much space of the casing 30.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An impeller for a fan, comprising:

a blade assembly (201) comprising a plurality of blades (2011), the plurality of blades (2011) being spaced apart centered on an axis of the impeller (20);

the hub (202) is arranged on the blade assembly (201) and is connected with a plurality of blades (2011);

wherein, the number of the wheel hubs (202) is a plurality, the wheel hubs (202) are arranged at intervals along the axis of the impeller (20), and the outer diameter of at least one of the wheel hubs (202) is smaller than that of the blade assembly (201).

2. The impeller of a fan according to claim 1,

the outer circumferential surface of said at least one of said plurality of hubs (202) is connected to an innermost side (2012) of said plurality of blades.

3. The impeller of a fan according to claim 1,

the at least one of the plurality of hubs (202) includes a first hub (2021), and the first hub (2021) is provided at an end of the blade assembly (201) in an axial direction of the impeller (20).

4. The impeller of a fan as claimed in claim 3,

the first hub (2021) comprises a connecting shaft (2023), the connecting shaft (2023) is located at an outer surface of the first hub (2021) facing away from the blade assembly (201), and the connecting shaft (2023) extends along an axis of the impeller (20) in a direction facing away from the blade assembly (201);

wherein the length of the connecting shaft (2023) is proportional to the outer diameter of the first hub (2021).

5. The impeller of a fan according to claim 1,

the at least one of the plurality of hubs (202) includes a first hub (2021), and the first hub (2021) is provided between both ends of the blade assembly (201) in the axial direction of the impeller (20).

6. The impeller of a fan according to claim 1,

the plurality of hubs (202) further includes a second hub (2022), the second hub (2022) having an outer diameter greater than or equal to an outer diameter of the blade assembly (201).

7. A fan, characterized in that it comprises an impeller (20) of a fan (10) according to any one of claims 1 to 6.

8. The fan as claimed in claim 7, comprising:

a housing (30) defining an air outlet duct, the impeller (20) being located partially within the air duct;

the shell (30) is provided with a concave hole (2024), the connecting shaft (2023) is located in the concave hole (2024), and the length of the connecting shaft (2023) is in direct proportion to the depth of the concave hole (2024).

9. The fan as claimed in claim 7, further comprising:

a housing (30) defining an air outlet channel, the impeller (20) being located entirely within the air channel.

10. An air conditioner, characterized in that it comprises a fan (10) according to any one of claims 7 to 9.