CN219774429U - Axial flow wind wheel, axial flow fan and air conditioner - Google Patents

Abstract

The utility model discloses an axial flow wind wheel, an axial flow fan and an air conditioner, wherein the axial flow wind wheel comprises: the fan comprises a hub and at least one fan blade, wherein the fan blade is fixedly connected to the hub, the fan blade can rotate under the action of the hub, the fan blade is arranged along the rotating direction of the fan blade, the front edge area of the fan blade forms a front edge of the fan blade, the rear edge area of the fan blade forms a rear edge of the fan blade, a flow guide structure is arranged on the fan blade, the flow guide structure extends along the rotating direction, one end of the flow guide structure is arranged between the front edge of the fan blade and the rear edge of the fan blade, and the other end of the flow guide structure extends to the rear edge of the fan blade. The flow guiding structure in the axial flow wind wheel can prevent radial leakage of air flow formed by the fan blades rotating around the central axis of the hub, so that more air flow formed by the rotation of the fan blades is conveyed towards the axial direction of the axial flow fan, and therefore the axial flow wind wheel can prevent the air flow from leaking.

Description

Axial flow wind wheel, axial flow fan and air conditioner

Technical Field

The utility model relates to the technical field of ventilation equipment, in particular to an axial flow wind wheel, an axial flow fan and an air conditioner.

Background

This section provides merely background information related to the present disclosure and is not necessarily prior art.

The axial flow wind wheel has the advantages of large air quantity, low noise and low pressure, is widely applied to air conditioners and equipment and systems for ventilating and radiating various different environments, and can directly greatly influence the efficiency and noise of a fan due to the advantages and disadvantages of the structural design of the axial flow wind wheel. With the improvement of the energy efficiency requirement of the air conditioner, the working efficiency of a fan for ventilation and heat dissipation is correspondingly improved, and the wind wheel is further required to have lower noise and higher efficiency.

The axial flow fan can be applied to an air conditioner outdoor unit, and the performance of the axial flow fan is directly influenced by the performance of the axial flow fan serving as a key part.

However, the axial flow wind wheel in the existing axial flow fan cannot avoid radial flow of the air flow, so that the air flow leaks from the outer edge of the impeller, noise generated by the air flow leakage is increased, and the working efficiency of the axial flow fan is reduced.

Disclosure of Invention

The utility model aims to at least solve the technical problem of radial leakage of air flow of the existing axial flow wind wheel, and therefore provides an axial flow wind wheel, which is realized by the following technical scheme:

the present utility model provides an axial flow wind wheel comprising:

the wheel hub is provided with a plurality of grooves,

at least one flabellum, flabellum fixed connection in on the wheel hub, the flabellum can be rotatory under wheel hub's effect, follows the flabellum winds direction of rotation, the front side edge region of flabellum forms the flabellum leading edge, the rear side edge region of flabellum forms the flabellum trailing edge, wherein, be equipped with the water conservancy diversion structure on the flabellum, the water conservancy diversion structure follows direction of rotation extends, just the one end of water conservancy diversion structure is located the flabellum leading edge with between the flabellum trailing edge, the other end extends to the flabellum trailing edge.

According to the axial flow wind wheel provided by the utility model, the flow guiding structure is arranged on the blades of the axial flow wind wheel, and extends from the front edge of the blades to the rear edge of the blades, so that the possibility of radial leakage of air flow formed by rotation of the blades around the rotation axis of the hub can be reduced, and the efficiency of axial conveying of the air flow formed by rotation of the blades to the axial direction of the axial flow fan is improved, therefore, the axial flow wind wheel provided by the utility model can improve the working efficiency of the axial flow fan.

In addition, the axial flow wind wheel according to the utility model can also have the following additional technical characteristics:

in some embodiments of the axial flow wind wheel of the present utility model, the fan blade includes a suction surface and a pressure surface disposed back-to-back, the suction surface having the flow guiding structure formed thereon, and/or the pressure surface having the flow guiding structure formed thereon.

In some embodiments of the axial flow wind wheel of the present utility model, the flow guiding structure includes a plurality of flow guiding ribs sequentially arranged along a radial direction of the fan blade, and flow guiding grooves are formed between adjacent flow guiding ribs.

In some embodiments of the axial flow wind wheel of the present utility model, the flow guiding ribs are arranged in an arc shape along the circumferential direction of the axial flow wind wheel, and a preset distance is provided between the end of the flow guiding rib near the front edge of the fan blade and the front edge of the fan blade, and the preset distance is greater than zero.

In some embodiments of the axial flow wind wheel of the present utility model, a central region of the hub has an axis of rotation about which the hub and the blades rotate;

along the axial direction of the rotation axis, the projection of the guide rib on a first plane perpendicular to the rotation axis is arc-shaped.

In some embodiments of the axial flow wind wheel of the present utility model, along the axial direction of the rotation axis, the plurality of flow guiding ribs project on the first plane to form a plurality of circular arcs, the plurality of circular arcs have a common center, and the center is located on the rotation axis of the hub.

In some embodiments of the axial flow wind wheel of the present utility model, the projection of the guide rib on the first plane forms a first arc;

the fan blade is provided with an arc corresponding to the first arc, the arc extends from the front edge of the fan blade to the rear edge of the fan blade, a second arc is formed by projection of the arc on a first plane, the first arc and the second arc have a common circle center and have the same radius, wherein the arc length of the first arc is more than 60% of the arc length of the second arc, and the arc length of the first arc is smaller than the arc length of the second arc.

In some embodiments of the axial flow wind wheel of the present utility model, the height and width of the flow guide ribs are in the range of 0.5mm to 2.0mm.

In some embodiments of the axial flow wind wheel of the present utility model, the distance between adjacent guide ribs is 5% to 20% of the radius of rotation of the axial flow wind wheel.

In a second aspect of the present utility model, there is provided an axial flow fan comprising:

an axial flow wind wheel, which is an axial flow wind wheel according to any one of the above;

and the output shaft of the driving device is connected with the hub in a matched manner, and the driving device drives the hub and the fan blade to rotate around the rotation axis of the hub.

In a third aspect of the present utility model, there is provided an air conditioner comprising:

the shell is provided with an air inlet and an air outlet, and a ventilation air duct is arranged between the air inlet and the air outlet;

the axial flow fan and the heat exchanger are both arranged in the air duct, wherein the axial flow fan is the axial flow fan.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a perspective view of an axial flow wind turbine illustrating the suction side of blades of the axial flow wind turbine according to some embodiments of the present utility model;

FIG. 2 is a perspective view of an axial flow wind turbine showing pressure surfaces of blades of the axial flow wind turbine according to some embodiments of the present utility model;

FIG. 3 is a schematic illustration of an axial flow wind turbine according to some embodiments of the present utility model;

FIG. 4 is an enlarged view of a portion of FIG. 3;

FIG. 5 is a schematic structural view of another perspective of an axial flow wind turbine according to some embodiments of the present utility model;

fig. 6 is a schematic structural view of an axial flow wind turbine according to some embodiments of the present utility model, in which the arrangement of the guide ribs is illustrated.

The reference numerals are as follows:

100. an axial flow wind wheel;

110. a hub; 111. an axis of rotation;

120. a fan blade; 121. a suction surface; 122. a pressure surface; 123. the front edge of the fan blade; 124. the rear edge of the fan blade;

130. a flow guiding structure; 131. a flow guiding rib; 132. a diversion trench;

l3, a first arc; l2, a second arc;

D. the initial position of the guide rib;

l, the distance between adjacent guide ribs;

r, the rotation radius of the axial flow wind wheel.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

As shown in fig. 1 to 6, the axial flow wind wheel 100 provided by the present utility model includes a hub 110 and blades 120, wherein the blades 120 are fixed on the hub 110, and are provided with a blade front edge and a blade rear edge, and the blade front edge is formed in a blade front edge region and the blade rear edge is formed in a blade rear edge region along the rotation direction of the blades.

The "front" and "rear" are referred to for the leading edge and trailing edge of the blade, as follows: as shown in fig. 3, for one of the blades, the direction indicated by the arrow is the front side of the blade, for example, the position where the front edge 123 of the blade is located is the front side of the blade, the position where the rear edge 124 of the blade is located is the rear side of the blade, and both the front side and the rear side of each blade disposed on the axial flow wind wheel can be understood as such.

When the blades 120 of the axial flow wind wheel are provided with the pressure surface 122 and the suction surface 121 which are arranged back to back, the front edge and the rear edge of the blades refer to that when the blades 120 rotate along the rotation axis 111 of the hub 110, the front edge of the suction surface 121 and the front edge of the pressure surface 122 of the blades 120 form the front edge of the blades 120 together, and the rear edge of the suction surface 121 and the rear edge of the pressure surface 122 form the rear edge of the blades 120 together. It should be emphasized that the blade leading edge 123 is a front edge region of the suction surface 121 and the pressure surface 122 of the blade 120, and the blade trailing edge 124 is a rear edge region of the suction surface 121 and the pressure surface 122 of the blade 120, so that the blade leading edge 123 and the blade trailing edge 124 are not a boundary between the suction surface 121 and the pressure surface 122, but are not a molding line provided on the blade 120.

When the fan blade 120 rotates along the rotation axis 111 of the hub 110 under the driving of the hub 110, an airflow is formed on the pressure surface 122 and the suction surface 121 of the fan blade 120, and in order to prevent the airflow from leaking in the radial directions of the pressure surface 122 and the suction surface 121, the fan blade 120 in the axial flow wind wheel 100 of the present utility model is provided with a guiding structure 130, and the guiding structure 130 can prevent the formed airflow from leaking to the outside in the radial direction of the fan blade 120, specifically, the guiding structure 130 starts at a position between the front edge 123 and the rear edge 124 of the fan blade and extends to the rear edge of the fan blade 120.

Since the leading edge 123 refers to a specific area on the front side of the fan blade 120, and the trailing edge 124 refers to a specific area on the rear side of the fan blade 120, when the flow guiding structure 130 extends to a vicinity of a boundary between the suction surface 121 and the pressure surface 122, radial leakage of the airflow on the fan blade 120 can be effectively prevented.

It should be noted that, compared with the prior art, the present utility model has an innovative point that the initial position of the flow guiding structure 130 in the axial flow wind wheel 100 is set at a position between the front edge and the rear edge of the fan blade 120, for example, the initial point of the flow guiding structure 130 is set on an arc extending from the front edge 123 to the rear edge 124 of the fan blade, and the length of the arc between the initial point of the flow guiding structure 130 and the front edge 123 of the fan blade is one third of the total length of the arc between the front edge 123 and the rear edge 124 of the fan blade, that is, the initial point of the flow guiding structure 130 is located at a position between the front edge 123 and the rear edge 124 of the fan blade. The reason that the starting point of the flow guiding structure 130 of the axial flow wind wheel 100 is not set on the front edge is that the starting point of the flow guiding structure 130 is set at a position between the front edge and the rear edge and the flow guiding structure 130 extends to the rear edge can more effectively prevent radial leakage of the airflow formed on the fan blades 120, therefore, the inventive concept provided by the axial flow wind wheel 100 overcomes the long-standing technical prejudice in the field and can achieve better technical effect.

The axial flow wind wheel can also achieve the following technical effects:

when the fan blade rotates under the drive of the hub, the partial area on the fan blade, which is close to the front edge of the fan blade, is not suitable for being provided with the flow guiding structure due to the low speed of the formed air flow, so that the axial flow wind wheel provided by the utility model avoids the possibility of generating turbulent air flow in the partial area on the fan blade, which is close to the front edge of the fan blade, one end of the flow guiding structure is arranged between the front edge of the fan blade and the rear edge of the fan blade and extends to the rear edge of the fan blade, and radial leakage can be prevented at the high speed position of the formed air flow on the fan blade, and on the other hand, the noise caused by the turbulent air flow in the front edge area of the fan blade can also be avoided.

One of the complete technical schemes of the utility model is as follows: the axial flow wind wheel comprises a wheel hub and at least one fan blade, wherein the fan blade is fixedly connected to the wheel hub, the fan blade comprises a suction surface and a pressure surface which are arranged back to back, the front edge area of the suction surface and the front edge area of the pressure surface form a fan blade front edge along the rotation direction of the fan blade around the rotation axis of the wheel hub, the rear edge area of the suction surface and the rear edge area of the pressure surface form a fan blade rear edge, a flow guiding structure is arranged on the fan blade, and the flow guiding structure starts between the fan blade front edge and the fan blade rear edge and extends to the fan blade rear edge. The axial flow wind wheel can effectively prevent radial leakage of airflow on the fan blades and prevent the possibility of noise generation in the front edge area of the fan blades.

In an embodiment of the axial flow wind wheel 100 of the present utility model, the flow guiding structure 130 of the axial flow wind wheel 100 includes a plurality of flow guiding ribs 131, the plurality of flow guiding ribs 131 are arranged at intervals, and flow guiding grooves 132 are formed between adjacent flow guiding ribs 131; the direction of extension of the flow guide groove 132 is the same as the direction of the air flow on the pressure surface 122 or the suction surface 121 of the fan blade 120. Therefore, the air flow formed by the rotation of the fan blade 120 around the rotation axis 111 of the hub 110 can circulate along the diversion trench 132, which is beneficial to forming stable air flow on the pressure surface 122 or the suction surface 121 of the fan blade 120, preventing the efficiency from being reduced due to the interaction of the air flows in different directions, and the diversion ribs 131 on the fan blade 120 can be arranged at different positions in the radial direction, which is equivalent to arranging a plurality of barriers on the fan blade 120 to prevent the radial leakage of the air flow.

In this embodiment, a plurality of flow guiding grooves 132 may be formed on the fan blade 120, and the flow guiding grooves 132 formed by the flow guiding ribs 131 arranged at intervals can prevent the airflow on the fan blade 120 from being abnormal and untapered, and due to the interaction between different airflows, noise is easy to be generated, so that the axial flow wind wheel 100 in this embodiment can also prevent the airflow interaction in different directions from being generated on the fan blade 120 to generate noise; from another perspective, when the fan blade 120 rotates around the rotation axis 111 of the hub 110, the plurality of flow guiding ribs 131 are disposed in the radial direction of the fan blade 120, so that the air flow on the fan blade 120 can be prevented from converging towards the radially outer edge of the fan blade 120, and the noise generated at the radially outer edge of the fan blade 120 is further prevented, and the above analysis shows that the axial flow wind wheel 100 in the embodiment can greatly reduce the noise generated by the rotation of the fan blade 120 around the central axis of the hub 110.

In an embodiment of the axial flow wind wheel 100 of the present utility model, the flow guiding structure 130 may be disposed on the suction surface 121 of the fan blade 120, and the flow guiding structure 130 may also be disposed on the pressure surface 122 of the fan blade 120, or on both the suction surface 121 and the pressure surface 122 of the fan blade 120.

The flow guiding structure 130 may be a plurality of flow guiding ribs 131 arranged at intervals, and the flow guiding structure 130 may be a plurality of flow guiding plates arranged at intervals, or continuous protrusions formed on the pressure surface 122 or the suction surface 121 and arranged along the circulation direction of the air flow on the pressure surface 122 or the suction surface 121.

In an embodiment of the axial flow wind wheel 100 of the present utility model, a plurality of flow guiding ribs 131 are arranged on the suction surface 121 of the fan blade 120 of the axial flow wind wheel 100 at intervals, wherein in the direction perpendicular to the suction surface 121, the height of the flow guiding ribs 131 is 0.5mm to 2.0mm, and the width of the flow guiding ribs 131 is 0.5mm to 2.0mm, wherein the height of the flow guiding ribs refers to the direction perpendicular to a plurality of planes formed in the arrangement area of the flow guiding ribs on the fan blade and tangent to the fan blade; the width of the guide rib refers to the direction parallel to a plurality of planes formed by the arrangement areas of the guide rib on the fan blade and tangent to the fan blade.

Similarly, when the plurality of guide ribs 131 are disposed on the pressure surface 122 of the fan blade 120, the height of the guide ribs 131 on the side of the pressure surface 122 is 0.5mm to 2.0mm, and the width of the guide ribs 131 is 0.5mm to 2.0mm in the direction perpendicular to the pressure surface 122.

In an embodiment of the axial flow wind wheel 100 of the present utility model, the guide rib 131 on the fan blade 120 of the axial flow wind wheel 100 is disposed in an arc, and may extend along the flowing direction of the airflow formed on the suction surface 121 or the pressure surface 122, where the start point of the guide rib 131 is located between the fan blade leading edge 123 and the fan blade trailing edge 124, as shown in fig. 6, a second arc L2 is formed between the fan blade leading edge 123 and the fan blade trailing edge 124, and the start point D of the guide rib 131 is disposed on the second arc L2 and extends along the second arc L2 until reaching the fan blade trailing edge 124, where the start point D of the guide rib 131 may be disposed at one third of the second arc L2 or at 30% of the second arc L2.

In an embodiment of the axial flow wind wheel 100 of the present utility model, the guide ribs 131 disposed on the fan blades 120 in an arc shape are projected on a first plane perpendicular to the rotation axis of the hub 110, as shown in fig. 3 and 6, illustrating the projection of the axial flow fan of the present embodiment on the first plane, and the guide ribs 131 of the guide structure 130 are a plurality of arcs disposed at intervals.

The multiple circular arcs formed by projecting the multiple guide ribs 131 on the first plane may have a common center, at this time, the guide grooves 132 formed between the adjacent guide ribs 131 on the suction surface 121 or the pressure surface 122 may have the same width along the flowing direction of the air flow, and the guide grooves with the same width may make the air flow on the fan blade more stable, so as to prevent noise generated by the fluctuation of the air flow, as shown in fig. 4, the width of the guide groove 132 is L1, that is, the interval distance between the adjacent guide ribs 131 is L1, and fig. 4 illustrates that the widths of the multiple guide grooves 132 are all L1.

It should be noted that, the widths of the diversion trenches 132 on the suction surface 121 and the pressure surface 122 may not be identical along the extending direction of the diversion ribs 131 or along the flowing direction of the air flow; the width of the same flow guide groove 132 can be increased or decreased along the extending direction of the flow guide rib 131, and the ventilation quantity and the airflow direction generated by the axial flow wind wheel 100 are specifically arranged according to the requirement.

When the hub 110 of the axial-flow wind wheel 100 is provided with the plurality of blades 120, the plurality of blades 120 are uniformly arranged along the circumferential direction of the rotation axis of the hub 110, in order to form stable air flow on the suction surface 121 or the pressure surface 122, the common center of a plurality of circular arcs formed by projecting the guide rib 131 of each blade 120 on the first plane can be arranged on the rotation axis, as shown in fig. 3, stable air flow can be formed on the plurality of blades 120 of the axial-flow wind wheel 100, and the possibility of noise generated by interaction of air flows in different directions is further reduced.

In an embodiment of the axial flow wind wheel 100 of the present utility model, as shown in fig. 3 and 4, the distance between adjacent ribs 131 is L1, that is, the width of the flow guiding groove 132 is L1, and the rotation radius of the axial flow wind wheel 100 is R in the direction indicated by the arrows on both sides of the axial flow wind wheel 100 of fig. 3, and the value of L1 may be 5% to 20% of the value of the rotation radius R of the axial flow wind wheel 100.

The rotation radius of the axial flow wind wheel refers to the distance between the outer edge of the fan blade connected with the hub and the rotation axis of the hub when the axial flow wind wheel rotates around the rotation axis of the hub, as shown in fig. 3, in a first plane perpendicular to the rotation axis of the hub, the distance R between the outer edge of the fan blade connected with the hub and the rotation axis of the hub is R.

In an embodiment of the axial flow wind wheel 100 of the present utility model, as shown in fig. 6, on a first plane perpendicular to the rotation axis of the hub 110, the projection of the flow guiding rib 131 on the first plane along the axial direction of the rotation axis is a first arc L3, a second arc L2 is formed on a circle where the first arc is located along the fan blade leading edge 123 to the fan blade trailing edge 124, and the projection of the center of the circle where the first arc is located on the rotation axis, that is, the arc between the fan blade leading edge 123 and the fan blade trailing edge 124 on the first plane forms a second arc L2, wherein the arc length of the first arc L3 is 60% of the arc length of the second arc L2, or the arc length of the first arc L3 is greater than 60% of the arc length of the second arc L2, but the arc length of the first arc L3 should be less than the total arc length of the second arc L2.

The utility model also provides an axial flow fan, the axial flow fan further comprises a driving device connected with the axial flow wind wheel 100, for example, the driving device can be a motor, the driving device can drive the axial flow wind wheel 100 to rotate, particularly, when the driving device is a motor, an output shaft of the motor is matched with the hub 110, and the driving device can be connected through a key and can also be connected through interference fit so as to drive the hub 110 and the fan blades 120 to rotate around the rotation axis 111.

The utility model also provides an air conditioner capable of applying the axial flow fan, the air conditioner comprises a shell, wherein an air inlet and an air outlet are arranged on the shell, a ventilation air channel is formed between the air inlet and the air outlet, the axial flow fan or the axial flow wind wheel 100 in any embodiment can be arranged in the ventilation air channel, and the air conditioner further comprises a heat exchanger arranged in the ventilation air channel.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (11)

1. An axial flow wind turbine, the axial flow wind turbine comprising:

the wheel hub is provided with a plurality of grooves,

at least one flabellum, flabellum fixed connection in on the wheel hub, the flabellum can be rotatory under wheel hub's effect, follows the direction of rotation of flabellum, the front side edge region of flabellum forms the flabellum leading edge, the rear side edge region of flabellum forms the flabellum trailing edge, wherein, be equipped with the water conservancy diversion structure on the flabellum, the water conservancy diversion structure follows the direction of rotation extends, just the one end of water conservancy diversion structure is located the flabellum leading edge with between the flabellum trailing edge, the other end extends to the flabellum trailing edge.

2. The axial flow wind wheel of claim 1, wherein the fan blades comprise a suction surface and a pressure surface arranged back-to-back, the suction surface is formed with the flow guiding structure, and/or the pressure surface is formed with the flow guiding structure.

3. The axial flow wind wheel according to claim 2, wherein the flow guiding structure comprises a plurality of flow guiding ribs arranged in sequence along the radial direction of the fan blade, and flow guiding grooves are formed between adjacent flow guiding ribs.

4. The axial flow wind wheel according to claim 3, wherein the flow guiding ribs are arranged in an arc shape along the circumferential direction of the axial flow wind wheel, and a preset distance is arranged between the end part, close to the front edge of the fan blade, of the flow guiding rib and the front edge of the fan blade, and the preset distance is larger than zero.

5. The axial flow wind wheel of claim 4, wherein a central region of the hub has an axis of rotation about which the hub and the blades rotate;

along the axial direction of the rotation axis, the projection of the guide rib on a first plane perpendicular to the rotation axis is arc-shaped.

6. The axial flow wind wheel of claim 5, wherein the plurality of flow-guiding ribs project on the first plane along the axial direction of the rotation axis to form a plurality of circular arcs, the plurality of circular arcs having a common center, and the center being located on the rotation axis of the hub.

7. The axial flow wind wheel of claim 5, wherein the projection of the deflector rib on the first plane forms a first arc;

the fan blade is provided with an arc corresponding to the first arc, the arc extends from the front edge of the fan blade to the rear edge of the fan blade, a second arc is formed by projection of the arc on a first plane, the first arc and the second arc have a common circle center and have the same radius, wherein the arc length of the first arc is more than 60% of the arc length of the second arc, and the arc length of the first arc is smaller than the arc length of the second arc.

8. The axial flow wind wheel of any one of claims 3-7, wherein the height and width of the flow ribs are each in the range of 0.5mm to 2.0mm.

9. An axial flow wind wheel according to any of claims 3-7, characterised in that the distance between adjacent guide ribs is 5% to 20% of the radius of rotation of the axial flow wind wheel.

10. An axial flow fan, characterized in that the axial flow fan comprises:

an axial flow wind wheel, which is an axial flow wind wheel according to any one of claims 1-9;

and the output shaft of the driving device is connected with the hub in a matched manner, and the driving device drives the hub and the fan blade to rotate around the rotation axis of the hub.

11. An air conditioner, characterized in that the air conditioner comprises:

the shell is provided with an air inlet and an air outlet, and a ventilation air duct is arranged between the air inlet and the air outlet;

the axial flow fan and the heat exchanger are arranged in the air duct, wherein the axial flow fan is the axial flow fan according to claim 10.