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

Abstract

The utility model discloses an axial flow wind wheel, an axial flow fan and air supply equipment, and relates to the technical field of wind wheels. Each blade is provided with a blade root, a blade top, a front edge and a tail edge, the blade roots and the blade tops are oppositely arranged, the front edges and the tail edges are oppositely arranged, the blade roots, the front edges, the blade tops and the tail edges are sequentially connected end to end to form peripheral contours of the blades, and the blade roots are connected with the hub; defining the intersecting part of the blade top and the front edge as the front edge of the blade top, the intersecting part of the blade top and the tail edge as the tail edge of the blade top, and the intersecting part of the blade root and the front edge as the front edge of the blade root; in the axial direction of the hub, the front edge of the blade top protrudes out of the end face of the hub; on a projection plane parallel to the axis of the hub, the axial height between the blade top tail edge and the blade top front edge is defined as H, and the axial height between the blade root front edge and the blade top front edge is defined as h; h is not greater than 0.5 H. According to the technical scheme, the efficiency of the fan can be improved, and power and noise can be reduced under the condition that the same air volume is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of air supply equipment, and particularly relates 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. When the axial flow impeller of a traditional axial flow fan rotates at a high speed, flow separation will occur, which affects the efficiency of the fan and generates relatively large fan noise. However, in the air conditioning system, the requirements for the efficiency and noise of the impeller are getting higher and higher. The traditional axial flow impeller can no longer meet the latest air conditioning energy efficiency and noise requirements, and there is an urgent need for an axial flow impeller with high efficiency and low noise to adapt to the new air conditioning system. Content of the Utility Model

[0003] The main purpose of the utility model is to propose an axial flow impeller, an axial flow fan and an air supply equipment, aiming to improve the efficiency of the fan and reduce the power and noise under the condition of achieving the same air volume.

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

[0005] A hub; and

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

[0007] Axially of the hub, the blade tip leading edge protrudes from the end face of the hub;

[0008] On the projection plane parallel to the axis of the hub, define the axial height between the blade tip trailing edge and the blade tip leading edge as H, and the axial height between the blade root leading edge and the blade tip leading edge as h; it satisfies that h is not greater than 0.5H.

[0009] In one embodiment, h is not less than 0.1H.

[0010] In one embodiment, h is equal to 0.3H.

[0011] In one embodiment, in the projection plane perpendicular to the hub axis, the radius of the axial flow wind wheel is defined as R, the radius of the hub is defined as r, and a reference virtual circle with a radius of 0.5R is constructed with the center point of the hub as the center. The blade has a first region located between the outer peripheral edge of the hub and the reference virtual circle; with the center point of the hub as the center, an arbitrary virtual circle with a radius taking any value between r and 0.5R is constructed, and the intersection point of the arbitrary virtual circle and the leading edge is defined as an arbitrary leading edge point of the blade.

[0012] On the projection plane parallel to the hub axis, the axial height between the root leading edge and the arbitrary leading edge point of the blade is defined as the arbitrary leading edge height; within the first region, as the radius of the arbitrary virtual circle increases, the arbitrary leading edge height gradually increases.

[0013] In one embodiment, the height difference between the maximum value and the minimum value of the arbitrary leading edge height is defined as h1, where h1 is greater than 0 and not greater than 0.2h.

[0014] In one embodiment, on the projection plane perpendicular to the hub axis, the straight line connecting the center point of the hub and the trailing edge point of the root is used as the reference line. The trailing edge has a protruding section that protrudes toward the side away from the leading edge relative to the reference line, and the protruding section and the reference line enclose a convex part.

[0015] In one embodiment, the protruding section is arranged in an arc shape.

[0016] The present utility model further provides an axial flow fan, including a motor and the axial flow wind wheel as described above. 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.

[0017] The present utility model further provides an air supply device, including the axial flow wind wheel or the axial flow fan as described above.

[0018] In one embodiment, the air supply device is an air conditioner, and the axial flow wind wheel is arranged in the outdoor unit and / or the indoor unit of the air conditioner.

[0019] The technical solution of the present utility model optimizes the structure of the axial flow fan blade, limits the height difference between the leading edge of the blade root and the leading edge of the blade tip within a reasonable range, and makes the axial height h between the leading edge of the blade root and the leading edge of the blade tip not greater than 0.5 times the axial height H of the blade. In this way, compared with the existing axial flow wind wheel, the height difference between the leading edge of the blade root and the leading edge of the blade tip can be reduced, so that the leading edge of the blade does not protrude too much from the hub at the blade tip, which can suppress the turbulent flow and flow separation generated at the leading edge, thereby achieving a good rectification effect, improving the fan efficiency, reducing the power, and suppressing the flow separation can also reduce the shedding of vortices, thereby reducing the noise. The axial flow wind wheel designed by this solution can improve the fan efficiency, and can reduce the power and noise under the condition of achieving the same air volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0021] Figure 1 It is a schematic exploded view of an embodiment of an outdoor unit of an air conditioner provided by the present utility model;

[0022] Figure 2 It is a schematic structural view of an embodiment of an axial flow wind wheel provided by the present utility model;

[0023] Figure 3 is Figure 1 a schematic structural view of the axial flow wind wheel from another perspective in ;

[0024] Figure 4 is Figure 1 a schematic structural view of the axial flow wind wheel from yet another perspective in ;

[0025] Figure 5 It is a comparison diagram of air volume - power between an existing wind wheel and an axial flow wind wheel of an embodiment of the present utility model;

[0026] Figure 6 It is a comparison diagram of air volume - noise between an existing wind wheel and an axial flow wind wheel of an embodiment of the present utility model.

[0027] Explanation of the reference numerals in the drawings:

[0028] 100, Axial flow impeller; 10, Hub; 20, Blade; 21, Blade root; 22, Blade tip; 23, Leading edge; 24, Trailing edge; 241, Protruding section; O, Center point of the hub; A, Leading edge of the blade tip; B, Trailing edge of the blade tip; C, Leading edge of the blade root; D, Trailing edge point of the blade root; 201, First region; 202, Second region; L0, Reference line;

[0029] 200, Motor; 300, Heat exchanger; 400, Air outlet panel; 500, Mesh cover.

[0030] The realization, functional features and advantages of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] 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 specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present utility model, the descriptions of "first" and "second" 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 of such features. 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, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the 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.

[0034] 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. When the axial flow impeller of a traditional axial flow fan rotates at a high speed, flow separation will occur, which affects the fan efficiency and generates relatively large fan noise. However, in the air conditioning system, the requirements for the impeller efficiency and noise are getting higher and higher. The traditional axial flow impeller can no longer meet the latest air conditioning energy efficiency and noise requirements. There is an urgent need for a high-efficiency and low-noise axial flow impeller to adapt to the new air conditioning system.

[0035] The present utility model provides an axial flow impeller 100. By optimizing the design of the structure of the axial flow impeller 100, the fan efficiency can be improved, and the power and noise can be reduced under the condition of achieving the same air volume.

[0036] The axial flow impeller 100 or the axial flow fan having the axial flow impeller 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 impeller 100 can be arranged in the outdoor unit and / or the indoor unit of the air conditioner.

[0037] Taking the application of the axial flow impeller 100 in the outdoor unit of an air conditioner as an example, as Figure 1 shown, in an embodiment, the outdoor unit of the air conditioner includes a housing, and an axial flow impeller 100, a motor 200 and a heat exchanger 300 arranged in the housing. The housing has an air inlet and an air outlet. The heat exchanger 300 is arranged opposite to the air inlet, and the axial flow impeller 100 is arranged between the heat exchanger 300 and the air outlet. The axial flow impeller 100 is drivingly connected to the motor 200. When the outdoor unit of the air conditioner works, the motor 200 drives the axial flow impeller 100 to rotate, and can suck external air into the housing through the air inlet, exchange heat with the heat exchanger 300, and then send it out from 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 mesh cover 500 is arranged 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 impeller 100 of the present utility model, the noise and power of the outdoor unit of the air conditioner can be reduced under the condition of achieving the same air volume, so that it can meet the latest air conditioning energy efficiency and noise requirements. The following mainly takes the implementation manner of the axial flow impeller 100 as an example for illustration.

[0038] Please refer to Figure 2 and Figure 3, in an embodiment of the present utility model, the axial flow impeller 100 includes a hub 10 and blades 20. The blade 20 has a blade root 21 and a blade tip 22 which are oppositely arranged, and a leading edge 23 and a trailing edge 24 which are oppositely arranged. The blade root 21, the leading edge 23, the blade tip 22 and the trailing edge 24 are sequentially connected end to end to form the outer peripheral contour of the blade 20, and the blade root 21 is connected to the hub 10; the part where the blade tip 22 intersects with the leading edge 23 is defined as the blade tip leading edge A, the part where the blade tip 22 intersects with the trailing edge 24 is defined as the blade tip trailing edge B, and the part where the blade root 21 intersects with the leading edge 23 is defined as the blade root leading edge C; in the axial direction of the hub 10, the blade tip leading edge A protrudes from the end face of the hub 10; on a projection plane parallel to the axis of the hub 10, the axial height between the blade tip trailing edge B and the blade tip leading edge A is defined as H, and the axial height between the blade root leading edge C and the blade tip leading edge A is defined as h; it satisfies that h is not greater than 0.5H.

[0039] 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 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 five. Exemplarily, three blades 20 are circumferentially spaced and evenly arranged on the hub 10, and the shapes and thicknesses of the 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 21, the leading edge 23, the blade tip 22 and the trailing edge 24 of the blade 20 are sequentially connected end to end to enclose and form the outer peripheral contour of the blade 20. Among them, the blade root 21 is used to connect the hub 10, and the blade tip 22 is located on the side of the blade root 21 away from the hub 10 to form the free end of the blade 20. In the oncoming flow direction, the leading edge 23 is located on the upstream side of the blade 20, and the trailing edge 24 is located on the downstream side of the blade 20. The axial flow impeller 100 is driven to rotate by a motor 200, and the air flow flows into the blade 20 from the leading edge 23, and after obtaining a pressure rise by the work of the blade 20, it flows out from the trailing edge 24 of the blade 20, thereby realizing the air supply function. Among them, as Figure 3 shown, the projection plane parallel to the axis of the hub 10 means the projection plane formed by the projection of the axial flow impeller 100 on a plane parallel to the axis of the hub 10; as Figure 4 shown, the projection plane perpendicular to the axis of the hub 10 means the projection plane formed by the projection of the axial flow impeller 100 on a plane perpendicular to the axis of the hub 10.

[0040] Axially, the leading edge A of the blade tip protrudes from the end face of the hub 10. For example, the hub 10 has a first end face and a second end face that are axially opposite. The first end face is located on the side of the second end face closer to the leading edge 23. The leading edge A of the blade tip protrudes a preset height compared to the first end face of the hub 10. The axial height H between the trailing edge B of the blade tip and the leading edge A of the blade tip, that is, the axial height H of the blade 20; the axial height h between the leading edge C of the blade root and the leading edge A of the blade tip, that is, the height difference between the leading edge C of the blade root and the leading edge A of the blade tip. In this embodiment, h is not greater than 0.5H, that is, the ratio of h to H is less than or equal to 0.5.

[0041] It has been found through research that the motors 200 of current traditional air conditioner outdoor units are generally installed on the suction surface side when the fan rotates. Due to the relationship among the motor 200, the axial flow impeller 100, and the motor 200 bracket, the leading edge 23 of the existing axial flow impeller 100 protrudes more at the blade tip 22 compared to the hub 10. There is a large height difference between the leading edge A of the blade tip and the leading edge C of the blade root. For example, the ratio of the height difference h between the leading edge A of the blade tip and the leading edge C of the blade root of the existing axial flow impeller 100 to the axial height H of its blade 20 is usually around 0.7. When the axial flow impeller 100 rotates at high speed, the air flow not only has axial movement but also radial movement due to the forward sweep of the impeller. The radially moving air flow first contacts the leading edge 23. When the height difference between the leading edge A of the blade tip and the leading edge C of the blade root is large, it will generate turbulent flow and flow separation, affecting noise and power.

[0042] The technical solution of the present utility model optimizes the structure of the axial flow fan blade, limits the height difference between the leading edge C of the blade root and the leading edge A of the blade tip within a reasonable range, and makes the axial height h between the leading edge C of the blade root and the leading edge A of the blade tip not greater than 0.5 times the axial height H of the blade 20. In this way, compared with the existing axial flow impeller, the height difference between the leading edge C of the blade root and the leading edge A of the blade tip can be reduced, so that the leading edge 23 of the blade 20 does not protrude too much from the hub 10 at the blade tip 22, which can suppress the turbulent flow and flow separation generated by the leading edge 23, thereby achieving a good rectifying effect, improving the fan efficiency, reducing the power, and suppressing the flow separation can also reduce the shedding of vortices, thereby reducing the noise. The axial flow impeller 100 designed with this solution can improve the fan efficiency, and can reduce the power and noise under the condition of achieving the same air volume.

[0043] In order to ensure that the leading edge 23 of the blade 20 has a certain obvious protruding part at the blade tip 22 compared with the hub 10, further, h is not less than 0.1H. That is, the axial height h between the leading edge C of the blade root and the leading edge A of the blade tip is not less than 0.1H and not greater than 0.5H, that is, the ratio of h to H is in the range of 0.1 to 0.5. For example, the ratio of h to H can be 0.1, 0.2, 0.3, 0.4, 0.5, etc. Optionally, h is equal to 0.3H, which can better suppress the turbulent flow and flow separation generated by the leading edge 23, improve the fan efficiency, and reduce the power and noise.

[0044] The existing wind turbine rotor is experimentally compared with the axial flow wind turbine rotor 100 of an embodiment provided by the present invention (hereinafter referred to as the wind turbine rotor of this solution), and the experimental data comparison diagrams as Figure 5 and Figure 6 shown are obtained. Among them, Figure 5 is the air volume-power comparison diagram of the existing wind turbine rotor and the wind turbine rotor with the trailing edge 24 protruding of the present application, Figure 6 is the air volume-noise comparison diagram of the existing wind turbine rotor and the wind turbine rotor with the trailing edge 24 protruding of the present application.

[0045] From Figure 5 and Figure 6 it can be seen that the ratio of the axial height h between the leading edge C of the blade root and the leading edge A of the blade tip to the axial height H of the blade 20 of the existing wind turbine rotor is 0.7 (that is, h / H = 0.7), and the ratio of the axial height h between the leading edge C of the blade root and the leading edge A of the blade tip to the axial height H of the blade 20 of the wind turbine rotor of this solution is 0.3 (that is, h / H = 0.3). Compared with the existing wind turbine rotor, the height difference between the leading edge C of the blade root and the leading edge A of the blade tip of the wind turbine rotor of this solution is reduced. Under the condition of the same air volume, the power of the wind turbine rotor of this solution is less than that of the existing wind turbine rotor, and the noise of the wind turbine rotor of this solution is less than that of the existing wind turbine rotor. It can be proved that by reducing the height difference between the leading edge C of the blade root and the leading edge A of the blade tip, the leading edge 23 of the blade 20 will not protrude too much from the hub 10 at the blade tip 22, which can suppress the turbulent flow and flow separation generated by the leading edge 23, so as to achieve a good rectification effect, improve the fan efficiency, and reduce the power and noise.

[0046] As Figure 3 and Figure 4As shown, in one embodiment, in the projection plane perpendicular to the axis of the hub 10, the radius of the axial flow impeller 100 is defined as R, and the radius of the hub 10 is defined as r. With the center point O of the hub 10 as the center, a reference virtual circle with a radius of 0.5R is configured. The blade 20 has a first region 201 located between the outer peripheral surface of the hub 10 and the reference virtual circle; with the center point O of the hub 10 as the center, an arbitrary virtual circle with a radius of any value between r and 0.5R is configured. The intersection point of the arbitrary virtual circle and the leading edge 23 is defined as an arbitrary leading edge point of the blade 20; in the projection plane parallel to the axis of the hub 10, the axial height between the root leading edge C and the arbitrary leading edge point of the blade 20 is defined as an arbitrary leading edge height; within the first region 201, as the radius of the arbitrary virtual circle increases, the arbitrary leading edge height gradually increases.

[0047] In this embodiment, the radius R of the axial flow impeller 100 refers to the straight-line distance from the center point O of the hub 10 to the outermost edge of the blade tip 22 in the radial direction of the hub 10; the radius r of the hub 10 refers to the straight-line distance from the center point O of the hub 10 to the outermost edge of the hub 10 in the radial direction of the hub 10; as Figure 4 As shown, in the projection plane perpendicular to the axis of the hub 10, a reference virtual circle with a radius of 0.5R is configured with the center of the hub 10 as the center. The reference virtual circle divides the blade 20 into a first region 201 and a second region 202. Among them, the first region 201 is located between the second region 202 and the hub 10. In the projection plane perpendicular to the axis of the hub 10, an arbitrary virtual circle with a radius of any value between r and 0.5R is configured with the center point O of the hub 10 as the center. For example, the radius of the arbitrary virtual circle can be r, 0.1R, 0.2R, 0.3R, 0.4R, 0.5R. When the radius of the arbitrary virtual circle is r, the arbitrary virtual circle is the outer peripheral edge of the hub 10. When the radius of the arbitrary virtual circle is 0.5R, the arbitrary virtual circle is the reference virtual circle. As Figure 3 As shown, in the projection plane parallel to the axis of the hub 10, within the first region 201, as the radius of the arbitrary virtual circle increases, the arbitrary leading edge height gradually increases, that is, in the region from r to 0.5R along the radial direction of the hub 10, as the radius increases, the height difference between the root leading edge C and the arbitrary leading edge point of the blade 20 gradually increases. That is to say, the leading edge height difference is smaller closer to the root 21 within the first region 201. Since the flow separation is more obvious at the root 21, through the above design, the height difference between the arbitrary leading edge 23 and the root leading edge C is smaller closer to the root 21. In this way, the flow separation at the root 21 can be suppressed, thereby achieving a better rectification effect, further improving the fan efficiency, reducing power and noise.

[0048] In one embodiment, the height difference between the maximum value and the minimum value of the arbitrary leading edge height is defined as h1, where h1 is greater than 0 and not greater than 0.2h. That is, 0 < h1 ≤ 0.2h. In this way, the maximum height difference between the leading edge C of the blade root and any leading edge point in the first region 201 is not too large, so that the flow separation at the blade root 21 can be more effectively suppressed, thus achieving a better rectifying effect, further improving the fan efficiency, and reducing power and noise. For example, h1 can be 0.05h, 0.1h, 0.15h, 0.2h, etc.

[0049] As Figure 4 shown, in one embodiment, on the projection plane perpendicular to the axis of the hub 10, the straight line connecting the center point O of the hub 10 and the trailing edge point D of the blade root 21 is used as the reference line L0. The trailing edge 24 has a protruding section 241 protruding toward the side away from the leading edge 23 relative to the reference line L0, and the protruding section 241 and the reference line L0 enclose a convex part.

[0050] In this embodiment, on the projection plane perpendicular to the axis of the hub 10, the intersection point of the blade root 21 and the trailing edge 24 is the trailing edge point D of the blade root 21. The trailing edge 24 has a protruding section 241 protruding toward the side away from the leading edge 23 relative to the reference line L0, and the protruding section 241 and the reference line L0 enclose a convex part. That is, the trailing edge 24 has at least a partially protruding part relative to the reference line L0. Through the protruding part of the trailing edge 24, the work area of the wind turbine can be increased. At the same time, the flow separation at the blade root 21 is the most obvious. By increasing the chord length (the chord length is the length of the circumferential line of a single blade 20) at the blade root 21 through the protrusion of the trailing edge 24, the flow separation can be suppressed to reduce the shedding of vortices. In this way, the fan efficiency can be further improved, and the power and noise can be further reduced.

[0051] Optionally, the protruding section 241 is arranged in an arc shape. In this way, the overall line type of the protruding section 241 is smoother, which is beneficial to achieving a better noise reduction effect.

[0052] In one embodiment, on the projection plane perpendicular to the axis of the hub 10, the radius of the axial flow wind turbine 100 is defined as R, the radius of the hub 10 is defined as r, and the straight-line distance between the center point O of the hub 10 and the most protruding point of the convex part is greater than r and less than [r + ((R - r) / 2)].

[0053] In this embodiment, the most protruding point of the convex part refers to the point on the protruding section 241 of the trailing edge 24 with the farthest straight-line distance from the reference line L0. By designing the position of the convex part, the convex part of the trailing edge 24 can be set closer to the blade root 21, so as to further increase the work done at the blade root 21, reduce power, and effectively prevent the flow separation at the blade root 21, achieving a better noise reduction effect.

[0054] The present utility model further provides an axial flow fan, which includes an axial flow impeller 100 and a motor 200. The motor 200 is drivingly connected to the axial flow impeller 100, and the motor 200 is used to drive the axial flow impeller 100 to rotate. The specific structure of the axial flow impeller 100 refers to the above embodiments. Since this axial flow fan adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one.

[0055] In this embodiment, the output shaft of the motor 200 is drivingly connected to the hub 10 of the axial flow impeller 100. By driving the axial flow impeller 100 to rotate with the motor 200, air flows in from the leading edge 23 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 24 of the blade 20, thereby realizing the air supply function. And through the above design of the axial flow impeller 100, the fan efficiency can be improved, and the power and noise can be reduced under the condition of achieving the same air volume.

[0056] 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 embodiments. Since this air supply device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which 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.

[0057] 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 indoor unit of the air conditioner.

[0058] The above 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, each blade having a root and a tip disposed opposite to each other, and a leading edge and a trailing edge disposed opposite to each other. The root, the leading edge, the tip, and the trailing edge are sequentially connected end to end to form the outer peripheral contour of the blade, and the root is connected to the hub. Define the part where the tip intersects the leading edge as the tip leading edge, the part where the tip intersects the trailing edge as the tip trailing edge, and the part where the root intersects the leading edge as the root leading edge; In the axial direction of the hub, the tip leading edge protrudes from the end face of the hub; On a projection plane parallel to the axis of the hub, define the axial height between the tip trailing edge and the tip leading edge as H, and the axial height between the root leading edge and the tip leading edge as h; satisfy that h is not greater than 0.5H.

2. The axial flow wind wheel according to claim 1, characterized in that, h is not less than 0.1H.

3. The axial flow wind wheel according to claim 1, characterized in that, h is equal to 0.3H.

4. The axial flow wind wheel according to claim 1, wherein In a projection plane perpendicular to the axis of the hub, define the radius of the axial flow wind turbine as R and the radius of the hub as r. With the center point of the hub as the center, construct a reference virtual circle with a radius of 0.5R. The blade has a first region located between the outer peripheral edge of the hub and the reference virtual circle. With the center point of the hub as the center, construct an arbitrary virtual circle with a radius taking any value between r and 0.5R, and define the intersection point of the arbitrary virtual circle and the leading edge as the arbitrary leading edge point of the blade; On a projection plane parallel to the axis of the hub, define the axial height between the root leading edge and the arbitrary leading edge point of the blade as the arbitrary leading edge height. In the first region, as the radius of the arbitrary virtual circle increases, the arbitrary leading edge height gradually increases.

5. The axial flow wind wheel according to claim 4, characterized in that, Define the height difference between the maximum value and the minimum value of the arbitrary leading edge height as h1, where h1 is greater than 0 and not greater than 0.2h.

6. The axial flow wind wheel according to any one of claims 1 to 5, characterized in that, In a projection plane perpendicular to the axis of the hub, use the straight line connecting the center point of the hub and the trailing edge point of the root as the reference line. The trailing edge has a protruding section that protrudes towards the side away from the leading edge relative to the reference line, and the protruding section and the reference line enclose a convex part.

7. The axial-flow wind wheel according to claim 6, characterized in that, The protruding section is arranged in an arc shape.

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

9. An air supply device, characterized in that, Comprising an axial flow wind turbine according to any one of claims 1 to 7, or comprising an axial flow fan according to 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 turbine is disposed in the outdoor unit and / or the indoor unit of the air conditioner.

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