Axial flow fans, fans and household appliances

Abstract

The present invention discloses an axial flow wind wheel, a fan and a household appliance, wherein the axial flow wind wheel comprises a hub, blades and a reinforcement part, wherein the blades comprise a blade body and a blade tip, the blade body is arranged at the hub, and the blade tip is arranged at one end of the blade body away from the hub; the reinforcement part is arranged at the blade tip to enhance the structural strength of the blade tip. The axial flow wind wheel of the technical solution of the present invention has the advantages of reducing fan noise and increasing fan air volume.

Description

Technical Field

[0001] The present invention relates to the technical field of wind wheels, and in particular to an axial flow wind wheel, a fan and a household appliance. Background Art

[0002] The blade tip of the current axial flow fan is farthest from the hub, so when the axial flow fan rotates, the linear speed of the blade tip is the highest. The blade tip is usually the weakest part of the blade structure. When the blade cuts the air at high speed, the blade tip is subject to the highest air pressure, and is prone to vibrate and make noise, affecting the quiet performance of the fan. Summary of the invention

[0003] The main purpose of the present invention is to provide an axial flow wind wheel, aiming to solve the problem of noise caused by blade tip vibration during the operation of the existing axial flow wind wheel.

[0004] To achieve the above-mentioned purpose, the axial flow wind wheel proposed in the present invention comprises:

[0005] Wheel hub;

[0006] a blade, comprising a blade body and a blade tip, wherein the blade body is arranged on the hub, and the blade tip is arranged at an end of the blade body away from the hub; and

[0007] The reinforcement part is arranged at the blade tip to enhance the structural strength of the blade tip.

[0008] In one embodiment, the reinforcement portion and the blade tip are integrally formed.

[0009] In one embodiment, the reinforcement portion is provided on the pressure surface and / or the suction surface of the blade tip.

[0010] In one embodiment, a projection of the reinforcement portion on the blade tip has a first side and a second side, wherein the first side is disposed close to an inner edge of the blade tip; and / or the second side is disposed close to an outer edge of the blade tip.

[0011] In one embodiment, the ratio of the distance between the two end points of the first side to the diameter of the axial flow wind wheel is greater than or equal to 0.02 and at most 0.05; and / or,

[0012] The ratio of the distance between the two end points of the second side to the diameter of the axial flow wind wheel is at least 0.04 and at most 0.1.

[0013] In one embodiment, the distance between the two end points of the first side is at least 10 mm and at most 100 mm; and / or,

[0014] The distance between the two end points of the second side is at least 10 mm and at most 100 mm.

[0015] In one embodiment, a ratio of the thickness of the reinforcement portion to the thickness of the blade tip is at least 0.2 and at most 1.

[0016] In one embodiment, the overall thickness of the reinforcement portion and the blade tip is at least 2.4 mm and at most 6 mm.

[0017] In one embodiment, the reinforcement portion is arranged in a flat shape, and / or the reinforcement portion is arranged with a uniform thickness.

[0018] In one embodiment, at least a portion of the reinforcement portion gradually thickens or thins along the rotation direction of the hub.

[0019] In one embodiment, the reinforcement portion is a rib structure.

[0020] In one embodiment, the connection between the reinforcement portion and the blade tip has a smooth transition.

[0021] The present invention further provides a fan, comprising a motor and an axial flow wind wheel, wherein the axial flow wind wheel is connected to the motor shaft of the motor, and the axial flow wind wheel comprises

[0022] Wheel hub;

[0023] a blade, comprising a blade body and a blade tip, wherein the blade body is arranged on the hub, and the blade tip is arranged at an end of the blade body away from the hub; and

[0024] The reinforcement part is arranged at the blade tip to enhance the structural strength of the blade tip.

[0025] The present invention further provides a household appliance, comprising a motor and an axial flow fan wheel, wherein the axial flow fan wheel is connected to the motor shaft of the motor, and the axial flow fan wheel comprises

[0026] Wheel hub;

[0027] a blade, comprising a blade body and a blade tip, wherein the blade body is arranged on the hub, and the blade tip is arranged at an end of the blade body away from the hub; and

[0028] The reinforcement part is arranged at the blade tip to enhance the structural strength of the blade tip.

[0029] The technical solution of the present invention provides a reinforcement part at the blade tip to enhance the structural strength of the blade tip, thereby reducing the vibration of the blade tip during the rotation of the axial flow wind wheel, reducing the noise during the operation of the fan, and improving the quiet performance of the fan. In addition, since the vibration of the blade tip is reduced, the blade's ability to cut the airflow is enhanced, and the wind volume loss of the fan is reduced, that is, the wind volume of the fan is increased. Compared with the existing axial flow wind wheel, the axial flow wind wheel of the present application also has the advantages of reducing the fan noise and increasing the fan air volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0031] Figure 1 It is a structural schematic diagram of an embodiment of an axial flow wind wheel of the present invention;

[0032] Figure 2 for Figure 1 A structural schematic diagram of another viewing angle of the illustrated embodiment;

[0033] Figure 3 A comparison chart of the speed-air volume of the existing fan and the fan of the present application;

[0034] Figure 4 This is a comparison chart of air volume-noise between the original fan and the fan of this application;

[0035] Figure 5 for Figure 1 A structural schematic diagram of the illustrated embodiment from another viewing angle;

[0036] Figure 6 for Figure 5 A partial enlarged view of point B in the middle;

[0037] Figure 7 for Figure 5 Sectional view in the AA direction;

[0038] Figure 8 for Figure 7 A partial enlarged view of point C in the middle.

[0039] Description of Figure Numbers:

[0040] Label name Label name 100 Axial flow fan 10 Wheels 20 blade 21 Blade body 22 Leaf tip 30 Enhancement 31 First side 32 Second side

[0041] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0044] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] The present invention provides an axial flow wind wheel 100 .

[0046] In the embodiment of the present invention, Figure 1 and Figure 2 As shown, the axial flow wind wheel 100 includes a hub 10, a blade 20 and a reinforcement part 30. The blade 20 includes a blade body 21 and a blade tip 22, wherein the blade body 21 is arranged at the hub 10, the blade tip 22 is arranged at an end of the blade body 21 away from the hub 10, and the reinforcement part 30 is arranged at the blade tip 22 to enhance the structural strength of the blade tip 22.

[0047] It is worth noting that in this embodiment, the blade body 21 has two opposite sides at one end away from the hub 10, and the blade tip 22 is disposed on the windward side of the blade body 21. However, in some embodiments, the blade body 21 is roughly triangular, and in this case, the blade tip 22 is disposed at the tip of the blade body 21.

[0048] It can be understood that the current axial flow wind wheel, because the blade tip is farthest from the hub, when the axial flow wind wheel rotates, the linear speed of the blade tip is the largest. However, the blade tip is usually a structurally weak part on the blade. When the blade cuts the air at high speed, the air pressure on the blade tip is the largest, and it is easy to vibrate and make noise, affecting the quiet performance of the fan. In response to the above problems, the axial flow wind wheel 100 of the technical solution of the present application is provided with a reinforcement part 30 at the blade tip 22 to enhance the structural strength of the blade tip 22, thereby reducing the vibration of the blade tip 22 during the rotation of the axial flow wind wheel 100, thereby reducing the noise during the operation of the fan and improving the quiet performance of the fan. In addition, since the vibration of the blade tip 22 is reduced, the ability of the blade 20 to cut the airflow is enhanced, and the air volume loss of the fan is reduced, that is, the air volume of the fan is increased.

[0049] The fan with the original axial flow wind wheel and the fan with the adopted axial flow wind wheel were compared experimentally, and the data in Table 1 were obtained as follows:

[0050]

[0051] Note: In Table 1, the original solution refers to a solution in which the reinforcement portion 30 is not provided at the blade tip 22 , and the new solution refers to a solution in which the reinforcement portion 30 is provided at the blade tip 22 .

[0052] Combined with Table 1, Figure 3 ,and Figure 4 It can be seen from the content that, compared with the existing axial flow wind wheel, the axial flow wind wheel 100 of the present application has the advantages of reducing fan noise and increasing fan air volume.

[0053] Combination Figures 5 to 8 As shown, in this embodiment, the reinforcement part 30 is integrally formed with the blade tip 22. It can be understood that setting the reinforcement part 30 to be integrally formed with the blade tip 22 can firstly increase the tightness of the connection between the reinforcement part 30 and the blade tip 22, so as to enhance the reinforcing effect on the structural strength of the blade tip 22. Secondly, the material of the blade 20 is usually plastic, and its manufacturing process is also mostly a very mature injection molding process in the industry. Then, the reinforcement part 30 is integrally formed with the blade tip 22, and only the blade tip 22 part of the injection mold needs to be adaptively modified, and the blade 20 can be prepared by injection molding, which is convenient to manufacture and cost-controlled. Of course, the design of the present application is not limited to this. In other embodiments of the present application, the reinforcement part 30 and the blade tip 22 can also be separately set, and the reinforcement part 30 can be fixed to the blade tip 22 of the blade 20 by bonding, clamping, riveting, etc.

[0054] Specifically, the reinforcement part 30 can be arranged on the pressure surface and / or the suction surface of the blade tip 22. It can be understood that due to the characteristics of the fluid, when the axial flow wind wheel 100 is working, one side of the blade 20 squeezes the air to form a pressure surface, and the other side is squeezed by the air to form a suction surface. In layman's terms, the front side of the axial flow wind wheel 100 is the pressure surface of the blade 20, and the back side of the axial flow wind wheel 100 is the suction surface of the blade 20. The blade tip 22, as a part of the blade 20, also has a pressure surface and a suction surface. The reinforcement part 30 is arranged on the pressure surface and / or the suction surface of the blade tip 22, which can facilitate the reinforcement part 30 to have a larger volume, thereby facilitating the reinforcement part 30 to enhance the structural strength of the blade tip 22. Specifically, in this embodiment, the reinforcement part 30 is arranged on the pressure surface of the blade tip 22. Of course, the design of the present application is not limited to this. In other embodiments of the present application, the reinforcement part 30 can also be arranged on the side edge of the blade tip 22.

[0055] Optionally, in the present embodiment, the reinforcement part 30 is provided in a flat shape. It can be understood that by providing the reinforcement part 30 as a flat structure, it is helpful to reduce the wind resistance of the reinforcement part 30 during the rotation of the axial flow wind wheel 100, thereby reducing noise and reducing the power consumption of the fan. At the same time, the reinforcement part 30 provided in a flat shape can replace the extension of the reinforcement part 30 along the thickness direction of the blade 20 by extending on the surface of the blade 20, so as to weaken the existence of the reinforcement part 30, improve the appearance of the blade 20, and also facilitate mold design and control of production costs. It is worth noting that in the present embodiment, the thickness of the reinforcement part 30 is uniformly provided.

[0056] In order to further improve the smoothness of the connection between the reinforcement portion 30 and the blade tip 22 and reduce the wind resistance of the reinforcement portion 30 , in the present embodiment, the reinforcement portion 30 and the blade tip 22 are smoothly transitioned.

[0057] Furthermore, at least a portion of the reinforcement portion 30 is gradually thickened along the rotation direction of the hub 10; in one embodiment, the reinforcement portion 30 is gradually thickened along the rotation direction of the hub 10. This not only facilitates airflow to flow over the surface of the reinforcement portion 30, thereby reducing wind resistance on the reinforcement portion 30, but also helps the blade tip 22 cut the air.

[0058] Of course, the design of the present application is not limited thereto. In other embodiments of the present application, at least a portion of the reinforcement portion 30 may be gradually thinned along the rotation direction of the hub 10, or the thickness of the reinforcement portion 30 may be uniform or relatively uniform.

[0059] Further, in the present embodiment, the projection of the reinforcement part 30 on the blade tip 22 has a first side edge 31 and a second side edge 32, wherein the first side edge 31 is arranged close to the inner edge of the blade tip 22, and the second side edge 32 is arranged close to the outer edge of the blade tip 22. Among them, the inner edge of the blade tip 22 is a side edge of the blade tip 22 close to the hub 10, and the outer edge of the blade tip 22 is a side edge of the blade tip 22 away from the hub 10. By arranging the first side edge 31 and the second side edge 32 of the reinforcement part 30 close to the inner edge and the outer edge of the blade tip 22 respectively, the degree of adaptation between the reinforcement part 30 and the blade tip 22 can be improved, which can not only improve the reinforcement effect on the structural strength of the blade tip 22, but also make the mold design simpler, which is conducive to controlling the production cost of the axial flow wind wheel 100. Further, in the present embodiment, the first side edge 31 of the reinforcement part 30 coincides with or substantially coincides with the inner edge of the blade tip 22, and the second side edge 32 coincides with or substantially coincides with the outer edge of the blade tip 22. It is worth noting that the “close” referred to in this embodiment can be that the first side 31 coincides with the inner edge of the blade tip 22, or the first side 31 is only close to the inner edge of the blade tip 22, that is, the first side 31 and the inner edge of the blade tip 22 can remain independent of each other. The interpretation of “close” in this embodiment is also applicable to the second side 32. Of course, the design of the present application is not limited to this. In other embodiments of the present application, only the first side 31 of the reinforcement portion 30 may be arranged close to the inner edge of the blade tip 22, or only the second side 32 of the reinforcement portion 30 may be arranged close to the outer edge of the blade tip 22. When only one side of the reinforcement portion 30 is arranged close to the edge of the reinforcement portion 30, the other side may be arranged in the middle of the blade tip 22.

[0060] It is worth noting that, for the overall structure of the blade 20, the reinforcement part 30 is a structure added on the basis of the original blade 20, that is, the structural strength of the blade tip 22 is enhanced without changing the original design of the blade 20. The degree of enhancement of the structural strength of the blade tip 22 by the reinforcement part 30 can be reflected to a certain extent in the volume of the reinforcement part 30. Furthermore, the size of the volume of the reinforcement part 30 can be related to the weight of the reinforcement part 30, that is, the setting of the reinforcement part 30 will change the center distribution of the blade 20. Then, in the actual production and application process, although the structural strength of the blade tip 22 can be gradually enhanced with the increase of the weight of the reinforcement part 30, when the reinforcement part 30 is too heavy, on the one hand, the weight of the axial flow wind wheel 100 will be increased, thereby increasing the power consumption of the wind turbine, and on the other hand, the center of gravity design of the blade 20 will be destroyed, so that the end of the blade 20 is subjected to greater force, and at this time, there is a risk of the blade 20 breaking during the rotation process. If the volume of the reinforcement portion 30 is too small (ie, the weight is too small), the reinforcement portion 30 will not significantly improve the structural strength of the blade tip 22, and the expected noise reduction effect cannot be achieved.

[0061] Based on the above reasons, the present application imposes certain restrictions on the distance between the two end points of the first side 31 and the distance between the two end points of the second side 32, so that the area occupied by the reinforcement part 30 on the blade 20 is within a reasonable range according to the different specifications of the axial flow wind wheel 100, so as to obtain the best application effect. Specifically, in this embodiment, the ratio of the distance between the two end points of the first side 31 to the diameter of the axial flow wind wheel 100 is at least 0.02 and at most 0.05, and the ratio of the distance between the two end points of the second side plate to the diameter of the axial flow wind wheel 100 is at least 0.04 and at most 0.1. Since the first side plate is arranged close to the inner edge of the blade tip 22, the second side 32 is arranged close to the outer edge of the blade tip 22, and the length of the outer edge of the blade tip 22 is longer than the length of the inner edge of the blade tip 22, the length range between the two end points of the second side 32 can be greater than that of the first side 31. It can be understood that by designing the distance between the two end points of the first side edge 31 and the second side edge 32 in a certain ratio to the diameter of the wind wheel, the volume of the reinforcement portion 30 can be adaptively designed according to the different sizes of the wind wheel, thereby obtaining the best expected effect in the actual application scenario. It should be noted that the diameter of the axial flow wind wheel 100 refers to the diameter of the circle swept by the blades 20 when rotating.

[0062] Of course, depending on the actual application scenario, in other embodiments of the present application, the ratio of the distance between the two end points of the first side edge 31 to the diameter of the axial flow wind wheel 100 may be limited to at least 0.02 and at most 0.05, or the ratio of the distance between the two end points of the second side plate to the diameter of the axial flow wind wheel 100 may be limited to at least 0.04 and at most 0.1.

[0063] Furthermore, in another embodiment of the present application, another limitation on the distance between the two end points of the first side 31 is given. Specifically, the distance between the two end points of the first side 31 is at least 10 mm and at most 100 mm. That is, in the technical solution defined in the present application, the distance between the two end points of the first side 31 can meet the condition that the ratio of the distance between the two end points of the first side 31 to the diameter of the axial flow wind wheel 100 is at least 0.02 and at most 0.05, and can also meet the condition that the distance between the two end points of the first side 31 is at least 10 mm and at most 100 mm. It is worth noting that the first side 31 can meet the above two conditions at the same time, or can only meet any one of the above two conditions.

[0064] Exemplarily, with the diameter of the wind wheel as D and the distance between the two end points of the first side 31 as L1, L1 can be 0.02D, 0.03D, 0.04D, 0.05D, etc.; and / or, L1 can be 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 100 mm, etc.

[0065] Furthermore, in another embodiment of the present application, another limitation is given to the distance between the two end points of the second side 32, specifically, the distance between the two end points of the second side 32 is at least 10 mm and at most 100 mm. That is, in the technical solution defined in the present application, the distance between the two end points of the first side 31 can satisfy the condition that the ratio of the distance between the two end points of the second side 32 to the diameter of the axial flow wind wheel 100 is at least 0.04 and at most 0.1, and can also satisfy the condition that the distance between the two end points of the second side 32 is at least 10 mm and at most 100 mm. It is worth noting that the second side 32 can satisfy both of the above conditions at the same time, or can satisfy only one of the above two conditions.

[0066] Exemplarily, with the diameter of the wind wheel as D and the distance between the two end points of the second side 32 as L2, L2 can be 0.04D, 0.05D, 0.06D, 0.07D, 0.08D, 0.09D, 0.1D, etc.; and / or, L2 can be 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 100 mm, etc.

[0067] In order to further limit the volume of the reinforcement part 30 and obtain a better design of the reinforcement part 30, the present embodiment further limits the thickness of the reinforcement part 30, specifically, the ratio of the thickness of the reinforcement part 30 to the thickness of the blade tip 22 is at least 0.2 and at most 1. It can be understood that by designing the thickness of the reinforcement part 30 in proportion to the thickness of the blade tip 22, the structural dimensions of the reinforcement part 30 can be designed accordingly to adapt to blade tips 22 of different thicknesses. Among them, if the reinforcement part 30 is too thin, it is not conducive to enhancing the structural strength of the blade tip 22, and if the reinforcement part 30 is too thick, it will increase the weight of the blade tip 22, which is not conducive to the blade tip 22 cutting the air, and if the reinforcement part 30 is too thick, it will also affect the appearance of the blade 20.

[0068] Furthermore, in another embodiment of the present application, another limitation is given to the overall thickness of the reinforcement portion 30 and the blade tip 22, specifically, the overall thickness of the reinforcement portion 30 and the blade tip 22 is at least 2.4 mm and at most 6 mm. That is, the thickness of the reinforcement portion 30 can meet the condition: the ratio of the thickness of the reinforcement portion 30 to the thickness of the blade tip 22 is at least 0.2 and at most 1; it can also meet the condition: the overall thickness of the reinforcement portion 30 and the blade tip 22 is at least 2.4 mm and at most 6 mm. It is worth noting that the thickness of the reinforcement portion 30 can meet one of the above conditions at the same time, or it can only meet any of the above conditions. It should be noted that the overall thickness of the reinforcement portion 30 and the blade tip 22 refers to the sum of the thickness of the reinforcement portion 30 and the thickness of the blade tip 22.

[0069] Exemplarily, assuming that the thickness of the blade tip 22 is H and the thickness of the reinforcement portion 30 is h, h can be 0.2H, 0.3H, 0.4H, 0.5H, 0.6H, 0.7H, 0.8H, 0.9H, H, etc.; and / or, the sum of h+H can be 2.4 mm, 2.8 mm, 3.2 mm, 3.6 mm, 4.0 mm, 4.4 mm, 4.8 mm, 5.2 mm, 5.6 mm, 6 mm, etc.

[0070] It should also be noted that, unlike the embodiment in which the reinforcement part 20 is arranged in a flat shape, in other embodiments of the present application, the reinforcement part 30 may be a rib structure, such as a reinforcing rib. In this case, the rib structure may be arranged on the pressure surface and / or suction surface of the blade tip 22, or on the side edge of the blade tip 22, and the rib structure may extend along the rotation direction of the hub 10, or along the radial direction of the hub 10, which is not limited in the present application. It should be noted that when the rib structure is arranged on the side edge of the blade tip 22, the reinforcement part 30 may extend to the blade body 21.

[0071] The present invention further provides a fan (not shown), which includes a motor (not shown) and an axial flow fan wheel 100, and the axial flow fan wheel 100 is connected to the motor shaft of the motor. The specific structure of the axial flow fan wheel 100 refers to the above embodiment. Since the fan adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0072] The present invention also proposes a household appliance (not shown), which includes a motor (not shown) and an axial flow fan 100, and the axial flow fan 100 is connected to the motor shaft of the motor. The specific structure of the axial flow fan 100 refers to the above-mentioned embodiment. Since the household appliance adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. Exemplarily, the household appliance can be an air conditioner, a fan, an air purifier, a dehumidifier, a humidifier, etc. In particular, when the household appliance is an air conditioner, the axial flow fan 100 can be installed in the indoor unit and / or outdoor unit of the air conditioner.

[0073] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An axial flow wind wheel, characterized in that: include Wheel hub; A blade, comprising a blade body and a blade tip, wherein the blade body is arranged on the hub, and the blade tip is arranged on an end of the blade body away from the hub; as well as A reinforcement portion is arranged at the blade tip, and the reinforcement portion is integrally formed with the blade tip to enhance the structural strength of the blade tip; the reinforcement portion is arranged in a flat shape and gradually thickens along the rotation direction of the hub; the projection of the reinforcement portion on the blade tip has a first side and a second side, the first side coincides with the inner edge of the blade tip, and the second side coincides with the outer edge of the blade tip; the ratio of the distance between the two end points of the first side to the diameter of the axial flow wind wheel is at least 0.02 and at most 0.05; the ratio of the distance between the two end points of the second side to the diameter of the axial flow wind wheel is at least 0.04 and at most 0.

1.

2. The axial flow wind wheel according to claim 1, characterized in that: The reinforcement portion is arranged on the pressure surface and / or the suction surface of the blade tip.

3. The axial flow wind wheel according to claim 1, characterized in that: The distance between the two end points of the first side is at least 10 mm and at most 100 mm; and / or, The distance between the two end points of the second side is at least 10 mm and at most 100 mm.

4. The axial flow wind wheel according to claim 1, characterized in that: A ratio of the thickness of the reinforcement portion to the thickness of the blade tip is at least 0.2 and at most 1.

5. The axial flow wind wheel according to claim 1, characterized in that: The overall thickness of the reinforcement and the blade tip is at least 2.4 mm and at most 6 mm.

6. The axial flow wind wheel according to claim 1, characterized in that: The reinforcement part is a rib structure.

7. The axial flow wind wheel according to claim 1, characterized in that: The connection between the reinforcement portion and the blade tip is smoothly transitioned.

8. A fan, characterized in that: It comprises a motor and an axial flow wind wheel according to any one of claims 1 to 7, wherein the axial flow wind wheel is connected to a motor shaft of the motor.

9. A household appliance, characterized in that: It comprises a motor and an axial flow wind wheel according to any one of claims 1 to 7, wherein the axial flow wind wheel is mounted on a motor shaft of the motor.

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