Axial flow wind wheel, axial flow fan and air supply equipment

Abstract

The utility model discloses an axial flow wind wheel, axial flow fan and air supply equipment, and relates to the technical field of air supply equipment, the axial flow wind wheel comprises a hub and blades, each blade is provided with a front edge, a tail edge, a blade root and a blade top, the front edge and the tail edge are oppositely arranged, the blade root and the blade top are oppositely arranged, and the front edge, the blade top and the tail edge are sequentially connected to form the peripheral contour of each blade. The blade root is connected with the hub, on a projection plane perpendicular to the axis of the hub, a straight line connecting the center point of the hub and the front edge point of the blade root is defined as a first straight line, the intersection point of the first straight line and the front edge is defined as a first intersection point, and the first intersection point is located between the front edge point of the blade root and the front edge point of the blade top. The front edge is provided with a first front edge section connected with the blade root front edge point and the first intersection point and a second front edge section connected with the first intersection point and the blade top front edge point, the first front edge section is located on the side, close to the tail edge, of the first straight line, and the second front edge section is located on the side, away from the tail edge, of the first straight line; according to the utility model, the static pressure resistance of the blade under the same air volume can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air supply equipment, in particular to an axial flow impeller, an axial flow fan and an air supply equipment. Background Art

[0002] Axial flow fans are widely used in household electrical appliances. For example, most of the outdoor units of household air conditioners adopt axial flow fans. Since the installation environments of current outdoor air conditioner units are diverse, and the situation where the outdoor air conditioner unit is placed in a narrow installation space is increasing. Due to the existence of the above situation, the environmental resistance is increased. If the anti-static pressure ability of the impeller is insufficient, the air cannot be blown out, seriously affecting the performance of the air conditioner. Therefore, there is an urgent need for an axial flow fan with high anti-static pressure ability to adapt to the new air conditioner environment. Summary of the Utility Model

[0003] The main object of the utility model is to propose an axial flow impeller, an axial flow fan and an air supply equipment, aiming to improve the anti-static pressure ability of the blade under the same air volume.

[0004] To achieve the above object, the axial flow impeller proposed by the utility model includes:

[0005] A hub; and

[0006] Blades, the blades have a leading edge and a trailing edge which are oppositely arranged, and a blade root and a blade tip which are oppositely arranged. The leading edge, the blade tip and the trailing edge are sequentially connected to form the outer peripheral contour of the blade, and the blade root is connected to the hub;

[0007] On the projection plane perpendicular to the axis of the hub, define the straight line connecting the center point of the hub and the leading edge point of the blade root as the first straight line, define the intersection point of the first straight line and the leading edge as the first intersection point. The first intersection point is located between the leading edge point of the blade root and the leading edge point of the blade tip. The leading edge has a first leading edge segment connecting the leading edge point of the blade root and the first intersection point, and a second leading edge segment connecting the first intersection point and the leading edge point of the blade tip. The first leading edge segment is located on the side of the first straight line close to the trailing edge, and the second leading edge segment is located on the side of the first straight line far from the trailing edge.

[0008] In one embodiment, the first leading edge segment is recessed towards the side close to the trailing edge relative to the first straight line. On the projection plane perpendicular to the axis of the hub, define the point with the farthest perpendicular distance from the first leading edge segment to the first straight line as the lowest point of the first leading edge segment. Define the radius of the blade tip as R, and define the straight line distance between the lowest point of the first leading edge segment and the center point of the hub as r1, and the r1 is not greater than 0.5R.

[0009] In an embodiment, on the projection plane perpendicular to the hub axis, the linear distance between the first intersection point and the center point of the hub is defined as r2, and r2 is not greater than 0.7R.

[0010] In an embodiment, the first leading edge segment is arc-shaped.

[0011] In an embodiment, the straight line connecting the lowest point of the first leading edge segment and the center point of the hub is defined as the second straight line, and the included angle between the first straight line and the second straight line is defined as α, and α is not greater than 20 degrees.

[0012] In an embodiment, on the projection plane parallel to the hub axis, there are formed no less than two grooves on the projection of the trailing edge, and the no less than two grooves are spaced apart along the extending direction of the trailing edge. On the projection plane perpendicular to the hub axis, the projection of the trailing edge is smoothly distributed.

[0013] In an embodiment, the number of the blades is no less than two and no greater than five.

[0014] The present utility model further provides an axial flow fan, which includes a motor and the axial flow impeller as described above. The motor is drivingly connected to the axial flow impeller, and the motor is used to drive the axial flow impeller to rotate.

[0015] The present utility model further provides an air supply device, which includes the axial flow impeller as described above, or includes the axial flow fan as described above.

[0016] In an embodiment, the air supply device is an air conditioner, and the axial flow impeller is arranged in the outdoor unit and / or the indoor unit of the air conditioner.

[0017] Through the structural optimization design of the blades of the axial flow impeller in the technical solution of the present utility model, a first leading edge segment relatively close to the trailing edge with respect to the first straight line and a second leading edge segment relatively far from the first straight line and far from the trailing edge are formed at the leading edge of the blade. By the relatively concave setting of the first leading edge segment, the diversion of the airflow on the blade surface can be delayed, the eddy current and energy loss caused by the airflow separation can be reduced, and the distribution of the airflow on the blade surface can be changed, the local airflow load of the first leading edge segment can be reduced, the static pressure borne by the blade can be reduced. At the same time, the concave design of the first leading edge segment and the convex design of the second leading edge segment can increase the structural strength of the leading edge of the blade, enable the blade to withstand the stress under high ambient static pressure, thereby improving the anti-static pressure ability of the blade. Therefore, the aerodynamic efficiency of the blade can be improved by reducing the eddy current and energy loss caused by the airflow separation and reducing the load of the blade, so that the fan can still maintain high performance under high ambient static pressure, and the anti-static pressure ability of the blade under the same air volume can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0019] Figure 1 Schematic diagram of the exploded structure of an embodiment of the outdoor unit of an air conditioner provided by the present invention;

[0020] Figure 2 Schematic diagram of the structure of an embodiment of the axial flow impeller provided by the present invention;

[0021] Figure 3 For Figure 1 Schematic diagram of the structure of the axial flow impeller from another angle;

[0022] Figure 4 For Figure 2 Schematic diagram of the structure of the blade;

[0023] Figure 5 Comparison diagram of the number of gauze layers - air volume between the existing impeller and the axial flow impeller of an embodiment of the present invention.

[0024] Explanation of the reference numerals in the drawings:

[0025] 100, axial flow impeller; 10, hub; 20, blade; 201, leading edge; 2011, first leading edge segment; 2012, second leading edge segment; 202, blade root; 203, blade tip; 204, trailing edge; O, center point of the hub; A, lowest point of the first leading edge segment; B, first intersection point; C, leading edge point of the blade root; D, leading edge point of the blade tip; L1, first straight line; L2, second straight line;

[0026] 200, motor; 300, heat exchanger; 400, air outlet panel; 500, grille.

[0027] The realization of the purpose, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0031] Axial flow fans are widely used in household electrical appliances. For example, most outdoor units of household air conditioners use axial flow fans. Since the installation environments of current outdoor air conditioner units are diverse, and the situation where the outdoor air conditioner unit is placed in a narrow installation space is increasing. Due to the existence of the above situation, the environmental resistance is increased. If the anti-static pressure ability of the wind wheel is insufficient, the air cannot be blown out, seriously affecting the performance of the air conditioner. Therefore, there is an urgent need for an axial flow fan with high anti-static pressure ability to adapt to the new air conditioner environment.

[0032] The present utility model provides an axial flow wind wheel 100. By optimizing and improving the structure of the axial flow wind wheel 100, the anti-static pressure ability of the axial flow wind wheel 100 can be improved, and under the same environmental resistance, the air volume output of the axial flow wind wheel 100 can be increased.

[0033] The axial flow wind wheel 100 or the axial flow fan having the axial flow wind wheel 100 can also be applied to a air supply device. Among them, the air supply device includes but is not limited to air conditioners, fans, air purifiers, dehumidifiers, humidifiers, etc. When the air supply device is an air conditioner, the axial flow wind wheel 100 can be arranged in the indoor unit and / or outdoor unit of the air conditioner.

[0034] Taking the application of the axial flow wind wheel 100 to the outdoor unit of an air conditioner as an example, as Figure 1As shown, in one embodiment, the outdoor unit of an air conditioner includes a housing, and an axial flow fan 100, a motor 200, and a heat exchanger 300 disposed inside the housing. The housing has an air inlet and an air outlet. The heat exchanger 300 is disposed opposite to the air inlet. The axial flow fan 100 is disposed between the heat exchanger 300 and the air outlet. The axial flow fan 100 is drivingly connected to the motor 200. When the outdoor unit of the air conditioner operates, the motor 200 drives the axial flow fan 100 to rotate, so that external air can be sucked into the housing through the air inlet, exchanged heat with the heat exchanger 300, and then sent out through the air outlet. Optionally, the housing has an air outlet panel 400 located on the front side. The air outlet panel 400 is provided with an air outlet, and a grille 500 is provided at the air outlet to prevent foreign objects from entering the interior of the outdoor unit of the air conditioner. By adopting the axial flow fan 100 of the present utility model, the air volume of the outdoor unit of the air conditioner can be increased under the condition of the same air environmental resistance, thereby improving the anti-static pressure capacity of the outdoor unit of the air conditioner, so that the outdoor unit of the air conditioner meets the requirements of being installed in a narrow installation space. The following mainly takes the embodiment of the axial flow fan 100 as an example for illustration.

[0035] Please refer to Figures 2 to 5 , in one embodiment of the present utility model, the axial flow fan 100 includes a hub 10 and blades 20. The blades 20 have a leading edge 201 and a trailing edge 204 that are oppositely arranged, and a blade root 202 and a blade tip 203 that are oppositely arranged. The leading edge 201, the blade tip 203, and the trailing edge 204 are sequentially connected to form the outer peripheral contour of the blade 20. The blade root 202 is connected to the hub 10. On the projection plane perpendicular to the axis of the hub 10, the straight line connecting the center point O of the hub and the leading edge point C of the blade root is defined as the first straight line L1, and the intersection point of the first straight line L1 and the leading edge 201 is defined as the first intersection point B. The first intersection point B is located between the leading edge point C of the blade root and the leading edge point D of the blade tip. The leading edge 201 has a first leading edge segment 2011 connecting the leading edge point C of the blade root and the first intersection point B, and a second leading edge segment 2012 connecting the first intersection point B and the leading edge point D of the blade tip. The first leading edge segment 2011 is located on the side of the first straight line L1 close to the trailing edge 204, and the second leading edge segment 2012 is located on the side of the first straight line L1 far from the trailing edge 204.

[0036] It can be understood that the axial flow impeller 100 includes a hub 10 and blades 20 provided on the outer periphery of the hub 10. Among them, the number of blades 20 is generally set to at least two, for example, it can be two, three, four, five or more. Optionally, the number of blades 20 is not less than two and not more than three. Exemplarily, three blades 20 are circumferentially spaced and evenly arranged on the hub 10, and the shapes and thicknesses of the respective blades 20 are substantially the same to ensure the stability when the axial flow impeller 100 rotates. Taking a single blade 20 as an example, the blade root 202, the leading edge 201, the blade tip 203 and the trailing edge 204 of the blade 20 are connected in sequence to enclose the outer peripheral contour of the blade 20. Among them, the blade root 202 is used to connect the hub 10, and the blade tip 203 is located on the side of the blade root 202 away from the hub 10 to form the free end of the blade 20. In the oncoming flow direction, the leading edge 201 is located on the oncoming flow side of the blade 20, and the trailing edge 204 is located on the outflow side of the blade 20. The axial flow impeller 100 is driven to rotate by a motor 200. Air flows in from the leading edge 201 of the blade 20, and the mechanical energy is converted into the kinetic energy of the air by the work done by the blade 20. After the air is pressurized, it flows along the surface of the blade 20 and flows out from the trailing edge 204 to achieve the air supply function.

[0037] Among them, the projection plane perpendicular to the axis of the hub 10 refers to the projection plane formed by the projection of the axial flow impeller 100 on a plane perpendicular to the axis of the hub 10.

[0038] In this embodiment, on the projection plane perpendicular to the axis of the hub 10, the straight line connecting the center point O of the hub and the blade root leading edge point C is defined as the first straight line L1. Among them, the point where the first straight line L1 intersects the projection of the leading edge 201 is positioned as the first intersection point B. According to the position of the first intersection point B, the leading edge 201 can be divided into a first leading edge segment 2011 and a second leading edge segment 2012. The first leading edge segment 2011 connects the blade root leading edge point C and the first intersection point B, and the second leading edge segment 2012 connects the first intersection point B and the blade tip leading edge point D. Among them, the blade root leading edge point C is also the intersection point of the blade root 202 and the leading edge 201, and the blade tip leading edge point D is also the intersection point of the blade tip 203 and the leading edge 201. And, the first leading edge segment 2011 is located on the side of the first straight line L1 close to the trailing edge 204, and the second leading edge segment 2012 is located on the side of the first straight line L1 away from the trailing edge 204, so that a concave region is formed by the enclosure of the first leading edge segment 2011 and the first straight line L1, and a convex region is formed by the enclosure of the second leading edge segment 2012 and the first straight line L1. Among them, the concave region can be an arc-shaped depression, or can be a wavy depression, or can be a depression of other shapes, etc., and the convex region can be an arc-shaped protrusion, or can be a linear protrusion.

[0039] The technical solution of the present utility model optimizes the structure design of the blades 20 of the axial flow impeller 100, so that the leading edge 201 of the blade 20 forms a first leading edge section 2011 relatively close to the trailing edge 204 with respect to the first straight line L1, and a second leading edge section 2012 relatively far from the first straight line L1 and away from the trailing edge 204. By arranging the first leading edge section 2011 to be relatively concave, the diversion of the airflow on the surface of the blade 20 can be delayed, the eddy current and energy loss caused by the airflow separation can be reduced, and the distribution of the airflow on the surface of the blade 20 can be changed, the local airflow load of the first leading edge section 2011 can be reduced, the static pressure borne by the blade 20 can be reduced. At the same time, the concave design of the first leading edge section 2011 and the convex design of the second leading edge section 2012 can increase the structural strength of the leading edge 201 of the blade 20, so that the blade 20 can withstand the stress under high ambient static pressure, thereby improving the static pressure resistance of the blade 20. Therefore, the aerodynamic efficiency of the blade 20 can be improved by reducing the eddy current and energy loss caused by the airflow separation and reducing the load of the blade 20, so that the fan can still maintain high performance under high ambient static pressure, and the static pressure resistance of the blade 20 at the same air volume can be improved.

[0040] In addition, the second leading edge section 2012 is arranged to be relatively convex, which can increase the overall area of the blade 20, and ensure that the design of the first leading edge section 2011 will not cause excessive loss of the area of the blade 20, so as to ensure that the blade 20 has enough area to do work.

[0041] As Figure 3 shown, in an embodiment, the first leading edge section 2011 is recessed relative to the first straight line L1 toward the side close to the trailing edge 204. On the projection plane perpendicular to the axis of the hub 10, the point with the farthest perpendicular distance from the first leading edge section 2011 to the first straight line L1 is defined as the lowest point A of the first leading edge section. The radius of the blade tip 203 is defined as R, and the straight-line distance between the lowest point A of the first leading edge section and the center point O of the hub is defined as r1, and the r1 is not greater than 0.5R.

[0042] In this embodiment, the radius R of the axial-flow wind wheel 100 refers to the straight-line distance from the center point O of the hub to the outermost edge of the blade tip 203 in the radial direction of the hub 10. The lowest point A of the first leading edge segment refers to the point among the multiple points where a number of vertical lines are drawn from the first straight line L1 and intersect with the first leading edge segment 2011, and the point with the longest distance along the vertical line extending to the first straight line L1 is the lowest point A of the first leading edge segment. The straight-line distance from the lowest point A of the first leading edge segment to the center point O of the hub is r1, where r1 is not greater than 0.5R. In this way, the position of the lowest point A of the first leading edge segment on the leading edge 201 is moderate, ensuring that the first leading edge segment 2011 of the blade 20 is not too long, and ensuring that the lowest point A of the first leading edge segment is closer to the leading edge point C of the blade root, thus being closer to the main area where the blade 20 is subjected to aerodynamic loads (the root of the blade 20 is the main area where the blade 20 is subjected to aerodynamic loads), and being able to more effectively improve the airflow adhesion and enhance the stall resistance of the blade 20.

[0043] The existing wind wheel (i.e., the wind wheel with a smooth leading edge) is experimentally compared with the axial-flow wind wheel 100 provided in an embodiment of the present invention (hereinafter referred to as the wind wheel with a sunken leading edge in this solution). The static pressure of the environment where the axial-flow wind wheel 100 is located is simulated by the number of gauze layers. The higher the number of gauze layers, the greater the static pressure of the environment where the axial-flow wind wheel 100 is located. Finally, the comparison chart of air volume - number of gauze layers as shown in Figure 5 is obtained. It can be seen from Figure 5 that under the same environmental static pressure, the air volume of the wind wheel with a sunken leading edge provided in this solution is greater than that of the existing wind wheel, and it can play the role of improving the static pressure resistance of the wind wheel.

[0044] On the basis of the above embodiment, continue to refer to Figure 3 . On the projection plane perpendicular to the axis of the hub 10, the straight-line distance between the first intersection point B and the center point O of the hub is defined as r2, and the r2 is not greater than 0.7R.

[0045] With such a setting, the length of the first leading edge segment 2011 is moderate, neither too long nor too short. Therefore, the second leading edge segment 2012 can form a raised area with sufficient area, preventing the area of the blade 20 from being too small, ensuring the work efficiency of the blade 20, and guaranteeing the air supply effect of the blade 20. Moreover, it can ensure that the leading edge 201 has sufficient concave areas to improve the aerodynamic efficiency of the blade 20 and the anti-static pressure ability of the blade 20. Additionally, the lowest point A of the first leading edge segment can be located at a specified setting position, making the lowest point A of the first leading edge segment closer to the main area where the blade 20 is subjected to aerodynamic loads, thereby enhancing the stall resistance ability of the blade 20. It can be understood that the first intersection point B is located on the side of the root leading edge point C away from the hub 10, so r1 should also be greater than the radius r of the hub 10. That is, r < r1 ≤ 0.7R. Exemplarily, r1 can be 0.1R, 0.2R, 0.3R, 0.4R, 0.5R, 0.6R, 0.7R, etc.

[0046] As Figure 2 , Figure 3 shown, optionally, the first leading edge segment 2011 is arranged in an arc shape. With such a setting, the air flow can transition from the leading edge 201 of the blade 20 to the surface of the blade 20 more smoothly, thereby reducing the air flow separation phenomenon and improving the aerodynamic performance of the fan. Moreover, making the air flow transition smoothly from the leading edge 201 of the blade 20 to the surface of the blade 20 can also reduce the generation of turbulence and the noise during the operation of the blade 20. And since the air flow can transition to the surface of the blade 20 more smoothly and smoothly, the operating resistance of the blade 20 will be reduced, and the operating efficiency of the axial flow impeller 100 will be improved.

[0047] As Figure 3 shown, in one embodiment, the straight line connecting the lowest point A of the first leading edge segment and the center point O of the hub is defined as the second straight line L2, and the included angle between the first straight line L1 and the second straight line L2 is defined as α, and α is not greater than 20 degrees.

[0048] In this embodiment, the included angle α, that is, ∠AOC. It can be understood that the lowest point A of the first leading edge segment is closest to the first straight line L1 on the first leading edge segment 2011. If the angle of the included angle α is too large, it will inevitably cause the lowest point A of the first leading edge segment to be farther from the first straight line L1, resulting in an excessive area of the concave region of the leading edge 201, which will excessively reduce the area of the blade 20, thereby affecting the structural strength and work efficiency of the blade 20. By reasonably designing the angle of the included angle α and limiting it between 0 degrees and 20 degrees, the area of the concave region of the leading edge 201 of the blade 20 is made appropriate. While enhancing the static pressure resistance of the blade 20, the area of the blade 20 is not excessively lost, so as to ensure the structural strength and work efficiency of the blade 20. In this way, it is more conducive to improving the efficiency of the axial flow wind wheel 100 and increasing the air output of the axial flow wind wheel 100 under the same ambient static pressure. Exemplarily, the second included angle can be 5 degrees, 10 degrees, 15 degrees, 20 degrees, etc.

[0049] In other embodiments of the present utility model, optionally, on the projection plane parallel to the axis of the hub 10, there are formed no less than two grooves on the projection of the trailing edge 204. The no less than two grooves are spaced apart along the extending direction of the trailing edge 204. On the projection plane perpendicular to the axis of the hub 10, the projection of the trailing edge 204 is smoothly distributed.

[0050] Among them, the no less than two grooves can cooperate to form a wavy structure on the trailing edge 204. Thus, when the air flow flows out through the trailing edge 204, the flow characteristics of the air flow can be improved, the air flow flowing out from the trailing edge 204 can be rectified, the eddy current formed by the air at the trailing edge can be reduced, and further the resistance of the air flowing out can be reduced, and the phenomenon of unstable air flow at the trailing edge 204 of the blade 20 can be reduced. Thereby, the work efficiency of the axial flow wind wheel 100 can be improved and the service life of the axial flow wind wheel 100 can be extended. Among them, the wavy shape refers to a shape with undulating and uneven structural characteristics. The wavy mechanism can be a wavy shape of regular geometric forms (such as sine wave, cosine wave, sawtooth wave, etc.), or an irregular wavy shape.

[0051] The present utility model also proposes an axial flow fan, which includes a motor 200 and an axial flow wind wheel 100. The specific structure of the axial flow wind wheel 100 refers to the above embodiments. Since this air conditioner outdoor unit adopts all the technical solutions of the above all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0052] In this embodiment, the output shaft of the motor 200 is drivingly connected to the hub 10. The motor 200 drives the axial flow impeller 100 to rotate. Air flows into the axial flow impeller 100 from the leading edge 201 of the blade 20, and after obtaining a pressure rise by the work done by the blade 20, it flows out from the trailing edge 204 of the blade 20, thereby realizing the air supply function. And through the design of the above-mentioned axial flow impeller 100, the anti-static pressure ability of the axial flow impeller 100 is improved, and the air output of the axial flow fan can be increased under the same ambient static pressure.

[0053] The present utility model further provides an air supply device, which includes an axial flow impeller 100 or an axial flow fan having an axial flow impeller 100. The specific structure of the axial flow impeller 100 refers to the above-mentioned embodiment. Since this air supply device adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated herein one by one. Among them, the air supply device includes but is not limited to air conditioners, fans, air purifiers, dehumidifiers, humidifiers, etc.

[0054] In one embodiment, the air supply device is an air conditioner, and the axial flow impeller 100 is arranged in the outdoor unit and / or the indoor unit of the air conditioner.

[0055] The above description is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. An axial flow wind wheel, characterized in that, Comprising: a hub; and blades, the blades having a leading edge and a trailing edge arranged oppositely, and a blade root and a blade tip arranged oppositely, the leading edge, the blade tip and the trailing edge are sequentially connected to form the outer peripheral contour of the blade, and the blade root is connected to the hub; On a projection plane perpendicular to the axis of the hub, a first straight line connecting the center point of the hub and the leading edge point of the blade root is defined, and an intersection point of the first straight line and the leading edge is defined as a first intersection point, the first intersection point is located between the leading edge point of the blade root and the leading edge point of the blade tip, the leading edge has a first leading edge segment connecting the leading edge point of the blade root and the first intersection point, and a second leading edge segment connecting the first intersection point and the leading edge point of the blade tip, the first leading edge segment is located on a side of the first straight line close to the trailing edge, and the second leading edge segment is located on a side of the first straight line away from the trailing edge.

2. The axial flow wind wheel according to claim 1, characterized in that, The first leading edge segment is recessed towards the side close to the trailing edge relative to the first straight line. On a projection plane perpendicular to the axis of the hub, a point with the farthest perpendicular distance from the first leading edge segment to the first straight line is defined as the lowest point of the first leading edge segment. The radius of the blade tip is defined as R, and the linear distance between the lowest point of the first leading edge segment and the center point of the hub is defined as r1, and the r1 is not greater than 0.5R.

3. The axial flow wind wheel according to claim 2, characterized in that, On a projection plane perpendicular to the axis of the hub, the linear distance between the first intersection point and the center point of the hub is defined as r2, and the r2 is not greater than 0.7R.

4. The axial flow wind wheel according to claim 2, wherein, The first leading edge segment is arranged in an arc shape.

5. The axial flow wind wheel according to claim 1, characterized in that, A second straight line connecting the lowest point of the first leading edge segment and the center point of the hub is defined, and an included angle between the first straight line and the second straight line is defined as α, and the α is not greater than 20 degrees.

6. The axial flow wind wheel according to claim 5, wherein, On a projection plane parallel to the axis of the hub, no less than two grooves are formed on the projection of the trailing edge, the no less than two grooves are spaced apart along the extending direction of the trailing edge, and on a projection plane perpendicular to the axis of the hub, the projection of the trailing edge is smoothly distributed.

7. The axial flow wind wheel according to any one of claims 1 to 6, characterized in that, The number of the blades is no less than two and no greater than five.

8. An axial flow fan, characterized in that, Comprising a motor and an axial flow wind wheel as described in any one of claims 1 to 7, the motor is drivingly connected to the axial flow wind wheel, and the motor is used to drive the axial flow wind wheel to rotate.

9. An air supply device, characterized in that, Comprising an axial flow wind wheel as described in any one of claims 1 to 7, or comprising an axial flow fan as described in claim 8.

10. The air supply device according to claim 9, characterized in that, The air supply device is an air conditioner, and the axial flow wind wheel is arranged in an outdoor unit and / or an indoor unit of the air conditioner.

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