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

Abstract

The invention discloses an axial flow wind wheel, an axial flow fan and air supply equipment, and relates to the technical field of wind wheels. The blade root is connected with the hub, and the front edge and the tail edge are arranged at the two ends of the blade root respectively. On a projection plane perpendicular to the axis of the hub, a straight line connecting the center point of the hub and the trailing edge point of the blade root serves as a datum line, the trailing edge is provided with a protruding section protruding towards the side away from the front edge relative to the datum line, and a protruding part is defined by the protruding section and the datum line. According to the technical scheme, the fan efficiency can be improved, and the power and noise can be reduced under the condition that the same air volume is achieved.

Description

Technical Field

[0001] This invention relates to the field of air supply equipment technology, and in particular to an axial flow impeller, an axial flow fan, and an air supply device. Background Technology

[0002] Axial flow fans are widely used in home appliances; for example, most outdoor units of household air conditioners use axial flow fans. Traditional axial flow fans experience flow separation when the axial impeller rotates at high speeds, affecting fan efficiency and generating significant noise. However, air conditioning systems have increasingly stringent requirements for impeller efficiency and noise reduction. Traditional axial flow impellers can no longer meet the latest energy efficiency and noise requirements, necessitating a high-efficiency, low-noise axial flow impeller to adapt to these new air conditioning systems. Summary of the Invention

[0003] The main objective of this invention is to provide an axial flow impeller, an axial flow fan, and an air supply device, which aims to improve fan efficiency and reduce power and noise while achieving the same air volume.

[0004] To achieve the above objectives, the present invention proposes an axial flow impeller comprising:

[0005] Wheel hubs; and

[0006] The blade has a blade root connected to the hub, and a leading edge and a trailing edge respectively disposed at both ends of the blade root;

[0007] On a projection plane perpendicular to the hub axis, a straight line connecting the center point of the hub and the trailing edge point of the blade root is used as a reference line. The trailing edge has a protruding section that protrudes away from the leading edge relative to the reference line, and the protruding section and the reference line enclose a convex part.

[0008] In one embodiment, on a projection plane perpendicular to the hub axis, the radius of the axial flow fan is defined as R, the radius of the hub is defined as r, and the straight-line distance between the center point of the hub and the most protruding point of the protrusion is defined as r1.

[0009] It satisfies that r1 is greater than r and r1 is less than [r+((Rr) / 2)].

[0010] In one embodiment, the protruding segment is arranged in an arc shape.

[0011] In one embodiment, the trailing edge has at least two protruding segments formed along its extension direction.

[0012] In one embodiment, the end of the protruding section near the hub coincides with the trailing edge point of the blade root.

[0013] In one embodiment, the blade further has a blade tip disposed opposite to the blade root. On a projection plane perpendicular to the hub axis, a straight line connecting the center point of the hub and the trailing edge point of the blade tip is defined as a first straight line, and a straight line connecting the center point of the hub and the most protruding point of the protrusion is defined as a second straight line. The first straight line and the second straight line are respectively placed on both sides of the reference line.

[0014] In one embodiment, the first straight line forms a first angle with the baseline, the first angle being greater than 0 degrees and not exceeding 30 degrees; and / or,

[0015] The second straight line forms a second angle with the baseline, the second angle being greater than 0 degrees and not exceeding 30 degrees.

[0016] The present invention also proposes an axial flow fan, including a motor and an axial flow impeller as described above, wherein the motor is driven to drive the axial flow impeller to rotate.

[0017] The present invention also proposes an air supply device, including the axial flow impeller or axial flow fan as described above.

[0018] In one embodiment, the air supply device is an air conditioner, and the axial flow impeller is located on the outdoor unit and / or indoor unit of the air conditioner.

[0019] The axial flow wind turbine of this invention optimizes the blade structure. On a projection plane perpendicular to the hub axis, a straight line connecting the center point of the hub and the trailing edge of the blade root is used as a reference line. This results in a convex section on the trailing edge of the blade that protrudes away from the leading edge relative to the reference line, forming a convex portion with the reference line. This ensures that the trailing edge has at least a partial protrusion relative to the reference line. This convexity increases the working area of ​​the wind turbine. Simultaneously, the flow separation is most pronounced at the blade root. The increased chord length at the blade root (the chord length is the length of the circumferential line of a single blade) suppresses flow separation, improving turbine efficiency. Furthermore, suppressing flow separation reduces vortex shedding, thereby lowering noise. The axial flow wind turbine designed using this scheme improves turbine efficiency while reducing power consumption and noise to achieve the same airflow. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is an exploded structural diagram of an embodiment of an air conditioner outdoor unit provided by the present invention;

[0022] Figure 2 This is a schematic diagram of a structural embodiment of the axial flow fan provided by the present invention;

[0023] Figure 3 for Figure 1 A schematic diagram of the central axial flow fan from another perspective;

[0024] Figure 4 A comparison diagram of air volume and power between the original wind turbine and an axial flow wind turbine according to an embodiment of the present invention;

[0025] Figure 5 This is a comparison chart of airflow and noise between the original wind turbine and an axial flow wind turbine according to an embodiment of the present invention.

[0026] Explanation of icon numbers:

[0027] 100. Axial flow wind turbine; 10. Hub; 20. Blade; 21. Blade root; 22. Blade tip; 23. Leading edge; 24. Trailing edge; 241. Protruding section; A. Center point of hub; B. Most protruding point of protrusion; C. Trailing edge point of blade tip; D. Trailing edge point of blade root; L0. Baseline; L1. First straight line; L2. Second straight line;

[0028] 200, Motor; 300, Heat Exchanger; 400, Air Outlet Panel; 500, Mesh Cover.

[0029] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] 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 positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] Axial flow fans are widely used in home appliances; for example, most outdoor units of household air conditioners use axial flow fans. Traditional axial flow fans experience flow separation when the axial impeller rotates at high speeds, affecting fan efficiency and generating significant noise. However, air conditioning systems have increasingly stringent requirements for impeller efficiency and noise reduction. Traditional axial flow impellers can no longer meet the latest energy efficiency and noise requirements, necessitating a high-efficiency, low-noise axial flow impeller to adapt to these new air conditioning systems.

[0034] The present invention provides an axial flow impeller 100. By optimizing the structure of the axial flow impeller 100, the efficiency of the fan can be improved, and the power and noise can be reduced while achieving the same air volume.

[0035] The axial flow impeller 100 or an axial flow fan having the axial flow impeller 100 can also be used in air supply equipment, including but not limited to air conditioners, fans, air purifiers, dehumidifiers, humidifiers, etc. When the air supply equipment is an air conditioner, the axial flow impeller 100 can be installed in the outdoor unit and / or indoor unit of the air conditioner.

[0036] Taking the application of this axial flow impeller 100 in an air conditioner outdoor unit as an example, such as Figure 1As shown, in one embodiment, the outdoor unit of the air conditioner includes a casing, and an axial flow fan 100, a motor 200, and a heat exchanger 300 disposed within the casing. The casing has an air inlet and an air outlet. The heat exchanger 300 is disposed opposite to the air inlet, and the axial flow fan 100 is disposed between the heat exchanger 300 and the air outlet. The axial flow fan 100 is driven by the motor 200. When the outdoor unit is working, the motor 200 drives the axial flow fan 100 to rotate, drawing outside air into the casing through the air inlet to exchange heat with the heat exchanger 300 before expelling it from the air outlet. Optionally, the casing has an air outlet panel 400 located on the front side, with an air outlet and a mesh cover 500 at the air outlet to prevent foreign objects from entering the interior of the outdoor unit. By employing the axial flow fan 100 of the present invention, the noise and power consumption of the outdoor unit can be reduced while achieving the same airflow, enabling it to meet the latest air conditioning energy efficiency and noise requirements. The following mainly illustrates the implementation of the axial flow fan 100.

[0037] Please see Figure 2 and Figure 3 In one embodiment of the present invention, the axial flow impeller 100 includes a hub 10 and blades 20. The blades 20 have a root 21 and a tip 22 disposed opposite to each other, and a leading edge 23 and a trailing edge 24 disposed opposite to each other. The leading edge 23 and trailing edge 24 are respectively located at the two ends of the root 21 and the tip 22. The root 21, the leading edge 23, the tip 22, and the trailing edge 24 are sequentially connected end-to-end to form the outer periphery of the blade 20. The root 21 is connected to the hub 10. On a projection plane perpendicular to the axis of the hub 10, a straight line connecting the center point A of the hub 10 and the trailing edge point D of the root 21 is taken as a reference line L0. The trailing edge 24 has a protruding section 241 that protrudes away from the leading edge 23 relative to the reference line L0. The protruding section 241 and the reference line L0 enclose a protrusion.

[0038] Understandably, the axial flow wind turbine 100 includes a hub 10 and blades 20 disposed on the outer periphery of the hub 10. The number of blades 20 is generally at least two, for example, two, three, four, five, or more. Optionally, the number of blades 20 is not less than two and not more than five. For example, the hub 10 has three blades 20 spaced circumferentially and evenly arranged, with each blade 20 having a substantially similar shape and thickness to ensure the stability of the axial flow wind turbine 100 during rotation. Taking a single blade 20 as an example, the blade root 21, leading edge 23, blade tip 22, and trailing edge 24 of the blade 20 are connected end-to-end to form the outer periphery of the blade 20. The blade root 21 connects to the hub 10, and the blade tip 22 is located on the side of the blade root 21 away from the hub 10, forming the free end of the blade 20. In the incoming 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 outflow side of the blade 20. The axial flow impeller 100 is driven to rotate by the motor 200. Air flows in from the leading edge 23 of the blades 20, and after the blades 20 do work to gain pressure, it flows out from the trailing edge 24 of the blades 20, thus realizing the air delivery function. The projection plane perpendicular to the axis of the hub 10 is the projection plane formed by the axial flow impeller 100 projected onto a plane perpendicular to the axis of the hub 10.

[0039] In this embodiment, on a projection plane perpendicular to the axis of the hub 10, the straight line connecting the center point A of the hub 10 and the trailing edge point D of the blade root 21 is used as the reference line L0. The center point A of the hub 10 is also the rotation center of the axial flow wind turbine 100, and the trailing edge point D of the blade root 21 is the intersection of the blade root 21 and the trailing edge 24. The reference line L0 is the straight line obtained by extending the line segment connecting the center point A of the hub 10 and the trailing edge point D of the blade root 21. The trailing edge 24 has a protruding segment 241 that protrudes away from the leading edge 23 relative to the reference line L0. The protruding segment 241 and the reference line L0 enclose a protrusion. That is, the protruding section 241 is located on the side of the baseline L0 away from the leading edge 23, so that the trailing edge 24 has at least a partially protruding part relative to the baseline L0. The protruding part of the trailing edge 24 can increase the working area of ​​the wind turbine. At the same time, the flow separation is most obvious at the blade root 21. The protrusion of the trailing edge 24 increases the chord length at the blade root 21 (the chord length is the length of the circumferential line of a single blade 20), which can suppress flow separation, improve wind turbine efficiency, and suppress flow separation can also reduce vortex shedding, thereby reducing noise.

[0040] An experimental comparison was conducted between the original wind turbine (i.e., a wind turbine without a protruding trailing edge) and the axial flow wind turbine 100 (hereinafter referred to as a trailing edge protruding wind turbine) provided in an embodiment of the present invention, and the results were as follows: Figure 4 and Figure 5 The experimental data comparison chart is shown below. Among them, Figure 4 This is a comparison chart of airflow and power between the original wind turbine and the wind turbine with a protruding trailing edge in this design. Figure 5This is a comparison chart of airflow and noise between the original wind turbine and the wind turbine with a protruding trailing edge in this design.

[0041] Depend on Figure 4 and Figure 5 It can be seen that, under the same airflow conditions, the power of the impeller with a protruding trailing edge provided by this solution is less than that of the original impeller, and the noise of the impeller with a protruding trailing edge provided by this solution is less than that of the original impeller. Through analysis, the technical solution of this application, by providing a protruding part on the trailing edge 24 of the blade 20, compared with the original impeller (i.e., the impeller without a protruding trailing edge), can reduce noise by 1.0dB to 1.5dB and power by about 3W under the same airflow conditions, which can achieve a good effect of reducing power and noise.

[0042] The axial flow impeller 100 of this invention optimizes the structure of the blades 20. On a projection plane perpendicular to the axis of the hub 10, the straight line connecting the center point A of the hub 10 and the trailing edge point D of the blade root 21 is used as the reference line L0. This allows the trailing edge 24 of the blade 20 to have a protruding section 241 that protrudes away from the leading edge 23 relative to the reference line L0. The protruding section 241 and the reference line L0 enclose a convex portion. This ensures that the trailing edge 24 has at least a partially protruding portion relative to the reference line L0. The protrusion of the trailing edge 24 increases the working area of ​​the impeller. Simultaneously, the flow separation is most pronounced at the blade root 21. The increased chord length at the blade root 21 by the protruding trailing edge 24 suppresses flow separation, improves fan efficiency, and reduces vortex shedding, thereby lowering noise. The axial flow impeller 100 designed using this scheme improves fan efficiency and reduces power consumption and noise while achieving the same airflow.

[0043] like Figure 3 As shown, in one embodiment, on a projection plane perpendicular to the axis of the hub 10, the radius of the axial flow fan 100 is defined as R, the radius of the hub 10 is defined as r, and the straight-line distance between the center point A of the hub 10 and the most protruding point B of the protrusion is defined as r1; satisfying that r1 is greater than r and r1 is less than [r+((Rr) / 2)].

[0044] In this embodiment, the radius R of the axial flow impeller 100 refers to the straight-line distance from the center point A 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 A of the hub 10 to the outermost edge of the hub 10 in the radial direction of the hub 10; the most protruding point B of the protrusion refers to the point on the protruding section 241 of the trailing edge 24 that is furthest from the baseline L0. By designing the position of the protrusion to satisfy r < r1 < [r + ((Rr) / 2)], the protrusion of the trailing edge 24 can be set closer to the blade root 21, thereby further increasing the work done at the blade root 21, reducing power, and effectively preventing flow separation at the blade root 21, resulting in better noise reduction.

[0045] Optionally, the protruding segment 241 is arc-shaped. This makes the overall line of the protruding segment 241 smoother, which is beneficial for achieving a better noise reduction effect.

[0046] Optionally, the trailing edge 24 is curved. This makes the overall shape of the trailing edge 24 smoother, which is beneficial for achieving better noise reduction.

[0047] In one embodiment, the trailing edge 24 has at least two protruding segments 241 along its extension direction. That is, the trailing edge 24 has at least two protruding segments 241 from the blade root 21 to the blade tip 22, giving the trailing edge 24 a wavy structure. Each protruding segment 241 protrudes away from the leading edge 23 relative to the reference line L0, and each protruding segment 241 and the reference line L0 form a convex portion, so that at least two convex portions are formed on the part of the blade 20 near the trailing edge 24. By providing multiple convex portions, the working area of ​​the impeller can be further increased, and flow separation at the blade root 21 can be suppressed, thereby further improving the efficiency of the wind turbine and reducing power and noise.

[0048] like Figure 3As shown, in one embodiment, the end of the protruding segment 241 near the hub 10 coincides with the trailing edge point D of the blade root 21. In this embodiment, the two ends of the protruding segment 241 of the trailing edge 24 intersect with the reference line L0 to form a first intersection point and a second intersection point, with the second intersection point located on the side of the first intersection point away from the blade root 21. Thus, the protruding segment 241 of the trailing edge 24 of the blade 20 gradually protrudes a distance away from the reference line L0 from the end near the blade root 21 before approaching and intersecting the reference line L0, thereby forming a convex portion that is higher in the middle and lower on both sides, enclosing the reference line L0. The first intersection point of the protruding segment 241 coincides with the trailing edge point D of the blade root 21, making the convex portion closer to the blade root 21, thereby more effectively increasing the work done at the blade root 21, reducing power consumption, and effectively preventing flow separation at the blade root 21, resulting in better noise reduction. Optionally, the distance between the first intersection point and the second intersection point is greater than the radius r of the hub 10 and less than the radius R of the axial flow fan 100.

[0049] Based on the above embodiments, such as Figure 3 As shown, in one embodiment, on a projection plane perpendicular to the axis of the hub 10, the straight line connecting the center point A of the hub 10 and the trailing edge point C of the blade tip 22 is defined as the first straight line L1, and the straight line connecting the center point A of the hub 10 and the most protruding point B of the protrusion is defined as the second straight line L2. The first straight line L1 and the second straight line L2 are placed on both sides of the reference line L0.

[0050] In this embodiment, the trailing edge point C of the blade tip 22 refers to the intersection of the blade tip 22 and the trailing edge 24. The trailing edge point D of the blade root 21 is located on the side of the baseline L0 near the leading edge 23, and the most prominent point B of the convex portion is located on the side of the baseline L0 near the trailing edge 24. This results in the first straight line L1 and the second straight line L2 being positioned on opposite sides of the baseline L0. If the baseline L0 is taken as the axis, and clockwise rotation is defined as positive and counterclockwise rotation as negative, then the first straight line L1 rotates clockwise by a preset positive angle relative to the baseline L0, and the second straight line L2 rotates counterclockwise by a preset negative angle relative to the baseline L0.

[0051] like Figure 3 As shown, in one embodiment, a first angle is formed between the first straight line L1 and the reference line L0, and the first angle is greater than 0 degrees and does not exceed 30 degrees. Let the first angle be denoted as α, then 0° < α ≤ 30°. This ensures that the distance between the trailing edge point C of the blade tip 22 and the reference line L0 is not too large, so that the trailing edge 24 of the blade 20 can work more effectively and suppress flow separation, thereby achieving better power reduction and noise reduction effects. The first angle α includes, but is not limited to, 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, etc.

[0052] like Figure 3 As shown, in one embodiment, a second angle is formed between the second straight line L2 and the reference line L0. This second angle is greater than 0 degrees and does not exceed 30 degrees. Let this second angle be denoted as β, then 0° < β ≤ 30°. This ensures that the distance between the most prominent point B of the convex portion and the reference line L0 is not too large, guaranteeing that the trailing edge 24 of the blade 20 can work more effectively and suppress flow separation, thereby achieving better power reduction and noise reduction. The second angle β includes, but is not limited to, 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, etc.

[0053] In order to perform work more effectively and suppress flow separation, thereby achieving better power reduction and noise reduction, optionally, 0°<α≤30° and 0°<β≤30°.

[0054] This invention also proposes an axial flow fan, including an axial flow impeller 100 and a motor 200. The motor 200 is drivenly 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 is as described in the above embodiments. Since this axial flow fan adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0055] In this embodiment, the output shaft of the motor 200 is driven to the hub 10. The motor 200 drives the axial flow impeller 100 to rotate. Air flows in from the leading edge 23 of the blades 20, and after the blades 20 do work to gain pressure, it flows out from the trailing edge 24 of the blades 20, thereby realizing the air delivery function. Furthermore, through the design of the axial flow impeller 100 described above, the fan efficiency can be improved, and power and noise can be reduced while achieving the same air volume.

[0056] This invention also proposes an air supply device, including 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 is as described in the above embodiments. Since this air supply device adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. The air supply device includes, but is not limited to, air conditioners, fans, air purifiers, dehumidifiers, and humidifiers.

[0057] In one embodiment, the air supply device is an air conditioner, and the axial flow impeller 100 is disposed in the outdoor unit and / or indoor unit of the air conditioner.

[0058] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An axial flow impeller, characterized in that, include: Wheel hub; as well as The blade has a blade root connected to the hub, and a leading edge and a trailing edge respectively disposed at both ends of the blade root; On a projection plane perpendicular to the hub axis, a straight line connecting the center point of the hub and the trailing edge point of the blade root is used as a reference line. The trailing edge has a protruding section that protrudes away from the leading edge relative to the reference line, and the protruding section and the reference line enclose a convex part.

2. The axial flow impeller as described in claim 1, characterized in that, On a projection plane perpendicular to the hub axis, the radius of the axial flow fan is defined as R, the radius of the hub as r, and the straight-line distance between the center point of the hub and the most protruding point of the protrusion is r1. It satisfies that r1 is greater than r and r1 is less than [r+((Rr) / 2)].

3. The axial flow impeller as described in claim 1, characterized in that, The protruding section is arc-shaped.

4. The axial flow impeller as described in claim 1, characterized in that, The trailing edge has at least two protruding segments along its extension direction.

5. The axial flow impeller as described in claim 1, characterized in that, The end of the protruding section near the hub coincides with the trailing edge of the blade root.

6. The axial flow wind turbine as described in any one of claims 1 to 5, characterized in that, The blade also has a blade tip that is positioned opposite to the blade root. On a projection plane perpendicular to the hub axis, a straight line connecting the center point of the hub and the trailing edge of the blade tip is defined as a first straight line, and a straight line connecting the center point of the hub and the most protruding point of the protrusion is defined as a second straight line. The first straight line and the second straight line are positioned on both sides of the reference line.

7. The axial flow impeller as described in claim 6, characterized in that, The first straight line forms a first angle with the baseline, the first angle being greater than 0 degrees and not exceeding 30 degrees; and / or, The second straight line forms a second angle with the baseline, the second angle being greater than 0 degrees and not exceeding 30 degrees.

8. An axial flow fan, characterized in that, It includes a motor and an axial flow impeller as described in any one of claims 1 to 7, wherein the motor is driven to the axial flow impeller and the motor is used to drive the axial flow impeller to rotate.

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

10. The air supply device as described in claim 9, characterized in that, The air supply device is an air conditioner, and the axial flow impeller is located in the outdoor unit and / or indoor unit of the air conditioner.

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