Air conditioner outdoor unit

Abstract

The air conditioner outdoor unit comprises an outer shell and a fan part, the fan part comprises a hub and a plurality of blades, a front edge, a rear edge, a blade top and a blade root are formed on each blade, and a plurality of characteristic faces are arranged from the blade root to the blade top; wherein the front edge distribution curve is formed by the projection of the front edge of the blade on the meridian plane, the rear edge distribution curve is formed by the projection of the rear edge of the blade on the meridian plane, and the points on the working angle distribution curve are composed of the working angles on the characteristic planes and the radiuses of the corresponding characteristic planes. At least one of the leading edge distribution curve, the trailing edge distribution curve and the working angle distribution curve is represented by a Bezier function. The front edges and / or the rear edges of the blades are adjusted through the front edge distribution curve, the rear edge distribution curve and the working angle distribution curve to optimize the flow field of the fan part, the smoothness degree of airflow passing through the blades is improved, the flow velocity distribution on the blades is controlled, the performance of the blades meets the design requirement, and then the static pressure coefficient and the working efficiency of the fan part are optimized.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioners, and particularly relates to an outdoor unit of an air conditioner. Background Art

[0002] Air conditioners are gradually developing in the direction of miniaturization. While reducing the volume, it is also necessary to ensure the air volume of the air supply system to ensure the heat exchange capacity of the air conditioner.

[0003] A small-frame air supply system with a large air volume, high efficiency, and high static pressure requires a corresponding large-sized axial flow fan. However, during actual operation, the large-sized fan not only generates significant aerodynamic noise but also generates low-frequency noise caused by vibration. During actual use, due to the strong penetration of the low-frequency transmission sound generated by it, the customer experience is seriously affected.

[0004] As an excitation source, the fan plays a key role in low-frequency transmission. The fan component involves many complex fluid mechanisms. The shape of its blades directly affects the working efficiency, service life, and noise of the fan component. An unreasonable blade profile of the fan component will lead to a large vibration intensity of the fan component and obvious low-frequency transmission sound of the air supply, which has a greater impact on the overall working efficiency and noise performance of the air conditioner. Summary of the Invention

[0005] The purpose of the present invention is to provide an outdoor unit of an air conditioner to solve the problems existing in the prior art that in the air supply system of the existing outdoor unit of an air conditioner, during operation, the fan has a large vibration intensity and the low-frequency transmission sound of the air supply is relatively strong.

[0006] To achieve the above-mentioned invention purpose, the present invention is implemented by adopting the following technical solutions:

[0007] The present invention provides an outdoor unit of an air conditioner, which includes:

[0008] An outer housing body, on which an air inlet and an air outlet are formed, and a wind channel is formed between the air inlet and the air outlet;

[0009] A fan component, which is installed in the wind channel and is located inside the air outlet. The fan component includes:

[0010] A hub; and

[0011] A plurality of blades, the plurality of blades are arranged on the outer peripheral wall of the hub and are spaced along the circumferential direction of the hub; the blades are formed with a leading edge, a trailing edge, a blade tip, and a blade root, and a plurality of characteristic surfaces are included from the blade root to the blade tip;

[0012] Wherein, the leading edge distribution curve is formed by the projection of the leading edge on the blade in the meridian plane, and the points on the leading edge distribution curve are composed of the corresponding radii of the characteristic surfaces of the blade and the axial coordinates of the leading edge points on the characteristic surfaces along the hub.

[0013] The trailing edge distribution curve is formed by the projection of the trailing edge on the blade in the meridian plane, and the points on the trailing edge distribution curve are composed of the corresponding radii of each characteristic surface and the axial coordinates of the trailing edge points on the characteristic surface along the hub;

[0014] The points on the working angle distribution curve are composed of the working angles on each of the characteristic surfaces and the radii of the corresponding characteristic surfaces. The working angle is the angle between the projections of the leading edge point and the trailing edge point corresponding to each characteristic surface on the circumferential section and the center point of the circumferential section. The circumferential section is perpendicular to the axis of the hub, and the center point is the projection of the central axis of the hub on the circumferential section;

[0015] At least one of the leading edge distribution curve, the trailing edge distribution curve, and the working angle distribution curve is represented by a Bessel function.

[0016] In some embodiments of the present application, from the blade root to the blade tip, the number of the characteristic surfaces is five, and at least one of the leading edge distribution curve, the trailing edge distribution curve, and the working angle distribution curve is represented by a 4th-order Bessel function.

[0017] In some embodiments of the present application, the leading edge line is controlled by 5 control points, including Q i (i = 0, 1, 2, 3, 4), Q 0 and Q 4 respectively represent the leading edge point of the blade root and the leading edge point of the blade tip, and the leading edge

[0018] distribution curve satisfies:

[0019]

[0020]

[0021] where n is the number of control points, and when the number of control points is 5, n = 5.

[0022] In some embodiments of the present application, the trailing edge line is controlled by 5 control points H i (i = 0, 1, 2, 3, 4), H 0 and H 4 respectively represent the trailing edge point of the blade root and the trailing edge point of the blade tip, and the trailing edge distribution curve satisfies:

[0023]

[0024]

[0025] where n is the number of control points, and when the number of control points is 5, n = 5.

[0026] In some embodiments of the present application, the working angle distribution curve satisfies:

[0027]

[0028]

[0029]

[0030] Among them, n is the number of control points. When the number of control points is 5, n = 5.

[0031] In some embodiments of the present application, the working angle g of the blade satisfies: 65° ≤ g ≤ 75°. In the direction from the blade root to the blade tip, the working angles corresponding to the respective characteristic faces first decrease and then increase.

[0032] The working angle is used to control the shape of the blade in the two-dimensional circumferential section, and thus can control the trailing-edge flow. It is also used to control the shape of the axial work surface of the blade, control the air volume of the fan blade member. In addition, the working angle can be used to control the installation angle of the three-dimensional blade and optimize the three-dimensional radial flow.

[0033] In some embodiments of the present application, the included angle between the line connecting the leading-edge point and the trailing-edge point corresponding to the characteristic face on the blade and the circumferential section is the installation angle. The points on the installation angle distribution curve are composed of the working angles on the respective characteristic faces and the radii of the corresponding characteristic faces:

[0034] The installation angle distribution curve satisfies:

[0035]

[0036] The above optimization design of the installation angle is beneficial to improving the three-dimensional radial flow of the blade, making the air flow smoother, reducing vibration and noise.

[0037] In some embodiments of the present application, a pressure surface and a suction surface are formed on the blade. The pressure surface is located on the side close to the air outlet, and a shock-absorbing area is formed on the pressure surface. The shock-absorbing area includes a plurality of strip-shaped ribs formed on the pressure surface along the rotation direction of the blade.

[0038] The strip-shaped ribs can improve the structural strength of the blade, reduce the impact of the air flow on the blade, and thus relieve the deformation of the fan member during high air volume and medium-high speed rotation, improve the structural stability, and are beneficial to reducing the low-frequency vibration of the fan member.

[0039] In some embodiments of the present application, along the direction away from the blade root, the damping zone includes a first damping zone, a second damping zone, and a third damping zone. The first damping zone is located at the leading edge position of the blade. The third damping zone is close to the blade tip, and each of the strip-shaped ribs in the third damping zone extends from the leading edge to the trailing edge. The length of each of the strip-shaped ribs in the second damping zone gradually increases along the direction from the first damping zone to the third damping zone.

[0040] The areas corresponding to the leading edge and the blade tip of the blade are severely deformed. The above distribution positions of the first damping zone, the second damping zone, and the third damping zone are beneficial to increasing the structural strength of the corresponding positions of the leading edge and the blade tip of the blade, which can not only weaken the vibration of the blade, but also inhibit the radial eddy current movement on the suction surface.

[0041] In some embodiments of the present application, a transition concave portion is formed on the first surface of the hub member close to the air outlet. A shaft sleeve is formed at the middle position of the hub member. The upper end of the shaft sleeve is higher than the lowest position of the transition concave portion, and a drainage portion is also provided at the lowest position of the transition concave portion.

[0042] The design of the transition concave portion is beneficial to dispersing the acting force on the first surface of the hub, avoiding the concentration of the centrifugal force and aerodynamic force of the blade, and is beneficial to improving the structural strength of the entire hub.

[0043] The drainage portion can drain the accumulated water in the transition concave portion, avoiding the corrosion of the hub by the accumulated water in the transition concave portion and affecting the service life of the hub.

[0044] Compared with the prior art, the advantages and positive effects of the present invention are:

[0045] The air conditioner outdoor unit involved in the present application adjusts at least one of the leading edge distribution curve, the trailing edge distribution curve, and the working angle distribution curve of the blade to optimize the flow field of the fan member by adjusting the leading edge and / or the trailing edge of the blade, improve the smoothness of the air flow passing through the blade, control the velocity distribution on the blade, so that its performance meets the design requirements, and further optimize the static pressure coefficient and working efficiency of the fan member;

[0046] In addition, by using bionic features, a damping zone is formed on the pressure surface of the blade. The damping zone includes a plurality of strip-shaped ribs extending along the rotation direction of the blade to increase the structural strength of the blade, improve the air intake volume, weaken the vibration of the corresponding position of the blade, and further reduce the low-frequency vibration of the fan member.

[0047] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become clearer. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] 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 some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0049] Figure 1 Is the overall structure diagram of the outdoor unit of the air conditioner according to the embodiment;

[0050] Figure 2 Is the installation schematic diagram of the fan part in the outdoor unit of the air conditioner according to the embodiment;

[0051] Figure 3 Is the three-dimensional view of the fan part according to the embodiment;

[0052] Figure 4 Is the top view of the fan part according to the embodiment;

[0053] Figure 5 Is the schematic diagram of the leading edge projection of the blade in the meridian plane according to the embodiment;

[0054] Figure 6 Is the schematic diagram of the trailing edge projection of the blade in the meridian plane according to the embodiment;

[0055] Figure 7 Is the schematic diagram of the blade working angle according to the embodiment;

[0056] Figure 8 Is the schematic diagram of the blade installation angle according to the embodiment;

[0057] Figure 9 Is the first surface position diagram of the hub according to the embodiment;

[0058] Figure 10 Is the front view of the fan part according to the embodiment;

[0059] Figure 11 Is the schematic diagram of the shock absorption area position according to the embodiment;

[0060] Figure 12 Is the sectional view of the fan part according to the embodiment;

[0061] Figure 13 Is the schematic diagram of the sectional three-dimensional view of the fan part according to the embodiment;

[0062] Figure 14 Is the comparison diagram of the static pressure efficiency between the fan part involved in the present application and the existing fan part;

[0063] Figure 15 Is the comparison diagram of the static pressure coefficient between the fan part involved in the present application and the existing fan part;

[0064] Figure 16 It is a comparison chart of specific noise between the fan component involved in this application and the existing fan component;

[0065] Figure 17 It is a comparison chart of tip amplitudes between the fan component involved in this application and the existing fan component;

[0066] Figure 18 It is a comparison chart of root amplitudes between the fan component involved in this application and the existing fan component;

[0067] Figure 19 It is a schematic diagram of the installation of the air guide ring;

[0068] Figure 20 It is a structural diagram of the air guide ring;

[0069] Figure 21 It is a structural diagram of the mounting part;

[0070] Figure 22 It is a connection diagram of the fan component and the drive assembly;

[0071] Figure 23 It is a connection diagram of the motor component and the motor bracket;

[0072] Reference numerals:

[0073] 100, outer housing; 101, air outlet; 110, protective grille; 120, mounting part; 121, first bending part; 122, second bending part;

[0074] 200, fan component; 201, suction surface; 202, pressure surface;

[0075] 210, hub; 211, hub housing; 212, strengthening part; 213, bushing; 214, first surface; 215, fixing convex part; 216, transition concave part; 217, drainage part; 218, through part;

[0076] 220, blade; 221, leading edge; 222, trailing edge; 223, blade root; 224, blade tip;

[0077] 230, damping area; 231, first damping area; 232, second damping area; 233, third damping area;

[0078] 300, air guide ring; 310, air-dispersing part; 320, connecting part; 321, strengthening rib; 330, reinforcing rib;

[0079] 410, motor component; 411, motor support foot; 420, support cross beam; 421, connecting end; 422, support part; 423, connecting vertical part. Detailed implementation manners

[0080] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part rather than all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0081] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0082] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "plurality" is two or more.

[0083] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0084] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0085] The design trend of miniaturizing the outdoor unit housing of commercial air conditioners with top air discharge poses a series of technical requirements for the air supply system, such as: large air volume, high static pressure, high efficiency, and low noise.

[0086] To meet these requirements, air conditioner manufacturers need to upgrade the core component (axial flow fan) of the air supply system. The number of blades 220 has developed from three blades to four blades, five blades, and six blades, and the overall diameter of the fan unit 200 has gradually increased. However, the air volume of the large-sized fan unit 200 will directly affect its efficiency and noise. Regarding the improvement of the capabilities of the fan unit 200, currently, more attention is paid to air volume, efficiency, static pressure, and noise. However, the issue of low-frequency resonance caused by the fan unit has not received enough attention. Because low-frequency transmitted sound has strong penetrability, it will seriously affect the user experience of customers.

[0087] To solve the above problems, the present invention proposes an outdoor unit of an air conditioner, which includes a housing 100 and a fan unit 200.

[0088] Reference Figure 1 、 Figure 2 As shown in

[0089] An installation cavity is formed inside the housing 100, in which working components such as a compressor and a heat exchanger are arranged. An air inlet (not shown) and an air outlet 101 are formed on the housing 100. A air duct is formed between the air inlet and the air outlet 101. Airflow is input from the air inlet and output from the air outlet 101 after passing through the air duct.

[0090] The fan unit 200 is installed in the air duct, specifically located inside the air outlet 101.

[0091] The fan unit 200 is connected to a drive assembly, which includes a motor bracket and a motor component 410. The motor bracket is used to fix the motor component inside the housing 100. The drive assembly is located inside the air outlet 101. Specifically, both ends of the motor bracket are fixed on the housing 100, and the motor component 410 is connected to the motor bracket.

[0092] The fan unit 200 is an axial flow fan, which is connected to the output end of the motor component 410. After the motor component is turned on, it drives the fan unit 200 to rotate, driving the airflow to pass through the heat exchanger for heat exchange and then output from the air outlet 101.

[0093] A wind guide ring 300 is further arranged between the outer side of the fan unit 200 and the housing 100. The wind guide ring 300 is arranged on the air outlet 101. Under the action of the fan unit 200, the airflow passes through the wind guide ring 300 and is output from the air outlet 101.

[0094] The fan component 200 is connected to the output end of the motor component 410. The motor component 410 drives the fan component 200 to rotate, thereby driving the air flow to be output from the air outlet 101 through the air duct.

[0095] Reference Figure 3 、 Figure 4 The fan component 200 includes a hub 210 and a plurality of blades 220 arranged along the circumferential side of the hub 210. The blades 220 are arranged at equal angles along the circumferential side of the hub 210, and the number thereof is set according to actual design requirements. For example, but not limited to, five blades 220 are arranged at equal angles along the circumferential side of the hub 210.

[0096] The fan component 200 includes a suction surface 201 and a pressure surface 202. The suction surface 201 is located on the side of the fan component 200 facing away from the air outlet 101, and the pressure surface 202 is located on the side of the fan component 200 close to the air outlet 101.

[0097] After the fan component 200 is started, the suction surface 201 forms a suction force on the air flow in the air duct. After the air flow passes through the fan component 200, it is pushed outward through the pressure surface 202 to the outside of the air outlet 101.

[0098] Under the action of the fan component 200, the air flow is conveyed from the suction surface 201 of the blades 220 on the fan component 200 to the direction of the pressure surface 202.

[0099] Along the rotation direction of the blades 220, a leading edge 221 and a trailing edge 222 are formed on each of the blades 220; along the radial direction of the hub 210, each of the blades 220 includes a blade root 223 connected to the hub 210 and a blade tip 224 facing away from the hub 210.

[0100] In other words, there are two curves on both sides of the blade 220 from the blade root 223 to the blade tip 224. The edge located in front along the rotation direction of the blade 220 is called the leading edge 221, and the edge located behind along the rotation direction of the blade 220 is the trailing edge 222.

[0101] A central axis (i.e., the rotation axis) is provided at the center of the hub 210. The plane perpendicular to the central axis is the rotation plane, and the plane perpendicular to the rotation plane and passing through the axis of the central axis is the meridian plane.

[0102] It can also be understood that: the meridian plane is the plane represented by the cylindrical coordinate system with the central axis as the origin, the radial direction as the X axis, and the central axis direction as the Y axis.

[0103] Among them, the leading edge distribution curve is formed by the projection of the leading edge 221 on the blade 220 in the meridian plane. The points on the leading edge distribution curve are composed of the corresponding radius of each characteristic surface of the blade 220 and the axial coordinate of the leading edge point on the characteristic surface along the hub 210.

[0104] The trailing edge distribution curve is formed by the projection of the trailing edge 222 on the blade 220 in the meridian plane. The points on the trailing edge distribution curve are composed of the corresponding radii of each characteristic surface and the axial coordinates of the trailing edge points on that characteristic surface along the hub 210.

[0105] The points on the working angle distribution curve are composed of the working angles of each characteristic surface and the corresponding radii of the characteristic surfaces. The working angle is the angle between the line connecting the projections of the leading edge point and the trailing edge point corresponding to each characteristic surface on the circumferential section and the center point of the circumferential section. The circumferential section is perpendicular to the axis of the hub 210, and the center point is the projection of the central axis of the hub 210 on the circumferential section.

[0106] At least one of the leading edge distribution curve, the trailing edge distribution curve, and the working angle distribution curve is represented by a Bessel function.

[0107] Considering the actual application calculations, during design, from the blade root 223 to the blade tip 224, the number of characteristic surfaces is five, and at least one of the leading edge distribution curve, the trailing edge distribution curve, and the working angle distribution curve is represented by a 4th-order Bessel function.

[0108] The leading edge line is controlled by 5 control points, including Q i (i = 0, 1, 2, 3, 4), Q 0 and Q 4 represent the leading edge point of the blade root and the leading edge point of the blade tip respectively, and Q 1 , Q 2 and Q 3 are three leading edge points spaced along the leading edge line in the direction from the blade root to the blade tip respectively. The leading edge distribution curve satisfies:

[0109]

[0110]

[0111] where n is the number of control points. When the number of control points is 5, n = 5.

[0112] The trailing edge line is controlled by 5 control points H i (i = 0, 1, 2, 3, 4), H 0 and H 4 represent the trailing edge point of the blade root and the trailing edge point of the blade tip respectively, and H 1 , H 2 and H 3 are three trailing edge points spaced along the trailing edge line in the direction from the blade root to the blade tip respectively. The trailing edge distribution curve satisfies:

[0113]

[0114]

[0115] Wherein, n is the number of control points. When the number of control points is 5, n = 5.

[0116] The working angle distribution curve satisfies:

[0117]

[0118]

[0119]

[0120] Wherein, n is the number of control points. When the number of control points is 5, n = 5.

[0121] In some embodiments of the present application, the working angle g of the blade 220 satisfies: 65° ≤ g ≤ 75°.

[0122] And the projection distribution curve of the working angle on the meridian plane also shows a formulaic change:

[0123] r = 0.36z 3 -0.28z 2 +3.5z + 74

[0124] The working angle is used to control the shape of the blade 220 in the two-dimensional circumferential section, thereby controlling the flow at the trailing edge 222, and is also used to control the shape of the axial work surface of the blade 220 to control the air volume of the fan blade member. In addition, the installation angle of the three-dimensional blade 220 can also be controlled by using the working angle to optimize the three-dimensional radial flow.

[0125] In some embodiments of the present application, referring to Figure 7 , in the direction from the blade root 223 to the blade tip 224, the working angles corresponding to each characteristic surface first decrease and then increase. The characteristic surface where the blade root 223 is located is the first characteristic surface, and the characteristic surface where the blade tip 224 is located is the fifth characteristic surface. Along the direction from the blade root 223 to the blade tip 224, the second characteristic surface, the third characteristic surface, and the fourth characteristic surface are equally spaced between the first characteristic surface and the fifth characteristic surface, and the working angle corresponding to the fourth characteristic surface is the smallest.

[0126] In some embodiments of the present application, the working angle g corresponding to the first characteristic surface 1 satisfies: 73° ≤ g 1 ≤ 75°, the working angle g corresponding to the second characteristic surface 2 satisfies: 70° ≤ g 2 < 73°, the working angle g corresponding to the third characteristic surface 3 satisfies: 67° ≤ g 3 < 70°, the working angle g corresponding to the fifth characteristic surface 5 satisfies: 65° < g 5 < 67°

[0127] Reference Figure 8 The included angle between the connection line between the leading edge point and the trailing edge point corresponding to the characteristic surface on the blade 220 and the circumferential section is the installation angle. The points on the installation angle distribution curve are composed of the working angles on the respective characteristic surfaces and the radii of the corresponding characteristic surfaces:

[0128] The installation angle distribution curve satisfies:

[0129]

[0130] Reference Figure 5 、 Figure 6 Among them, along the direction from the blade root 223 to the blade tip 224, the projection of the leading edge 221 of the blade 220 on the meridian plane includes a first leading edge projection segment and a second leading edge projection segment; the projection of the trailing edge 222 of the blade 220 on the meridian plane includes a first trailing edge projection segment, a second trailing edge projection segment, and a third trailing edge projection segment.

[0131] The first leading edge projection segment is a concave line segment extending towards the trailing edge 222 of the blade 220, and the second leading edge projection segment is a straight line segment, and / or

[0132] The first trailing edge projection segment is a convex line segment extending away from the leading edge 221, the second trailing edge projection segment is a concave line segment extending towards the leading edge 221, and the third trailing edge projection segment is a convex line segment extending away from the leading edge 221.

[0133] The above distribution of each projection segment of the leading edge 221 of the blade 220 on the meridian plane is beneficial to optimizing the performance of the fan member 200, increasing the air volume and air pressure flowing through the fan member 200 at the same rotational speed, reducing the shaft power required to reach the same rotational speed, improving the work efficiency, and contributing to energy conservation; reducing the low-frequency noise of the fan member 200 in the system and improving the user experience.

[0134] In some embodiments of the present application, the projection characteristics of the leading edge 221 of the blade 220 on the meridian plane satisfy: the length ratio of the first leading edge projection segment to the second leading edge projection segment is 3:2.

[0135] That is, along the radial direction of the blade 220, the projection curve of the leading edge 221 on the meridian plane is a concave line from 0% - 60% Span and linear from 60% Span - 100% Span.

[0136] The first leading edge projection segment changes in a formulaic manner, and the formula satisfies:

[0137] r = 0.0063z 3 - 1.3z 2 + 83.1z - 1519.

[0138] The second leading edge projection satisfies: r = -3.8z + 381.5.

[0139] Wherein, r is the radial dimension of the corresponding leading edge point from the blade root 223, and z is the height dimension of the corresponding leading edge point in the axial direction of the fan member 200.

[0140] In some embodiments of the present application, the projection characteristics of the trailing edge 222 of the blade 220 in the meridional plane satisfy that the length ratio of the first trailing edge projection segment to the second trailing edge projection segment and the third trailing edge projection segment is 7:7:6.

[0141] That is, along the radial direction of the blade 220, the projection curve of the trailing edge 222 in the meridional plane is convex from 0% - 35% Span, concave from 35% Span - 70% Span, and convex from 70% Span - 100% Span.

[0142] The first trailing edge projection segment changes formulaically, and the formula satisfies:

[0143] r = 0.0002z 3 - 0.12z 2 + 23.6z - 1395.

[0144] The projection of the second trailing edge 222 satisfies: r = -0.18z 3 + 121.88z 2 - 27217z + 2E +06 .

[0145] The projection of the third trailing edge 222 satisfies: r = -0.06z 3 - 42.44z 2 - 9554z + 716890.

[0146] Wherein, r is the radial dimension of the corresponding leading edge point from the blade root 223, and z is the height dimension of the corresponding leading edge point in the axial direction of the fan member 200.

[0147] The aerodynamic performance of the blade 220 is designed using the key feature curves, and its greatest innovation is to use a limited number of leading and trailing edge points to conduct rough and fine aerodynamic design and optimization of the fan shape.

[0148] When the blade 220 is at high air volume and medium to high rotational speed, it is most prone to deformation, and the deformation is periodic, so the vibration of the blade 220 will be very intense.

[0149] When the fan is at medium to high rotational speed, the deformation of the blade tip and the trailing edge of the blade top is the most serious. The wind deformation at these two places not only affects the air intake volume but also affects the low-frequency vibration of the fan.

[0150] During the swimming process, the golden pomfret uses the caudal fin under its belly for balance. The shape of its caudal fin is similar to a sickle and is composed of many strip-shaped tendons, which can weaken the impact of water flow on the body.

[0151] Using the above bionic structure and referring to Figure 10 、 Figure 11 In this application, a shock-absorbing area 230 is formed on the pressure surface 202 of the blade 220. The shock-absorbing area 230 includes a plurality of strip-shaped ribs formed on the pressure surface 202 along the rotation direction of the blade 220.

[0152] A certain interval is formed between adjacent strip-shaped ribs. The size of the strip-shaped ribs along the radial direction of the blade 220 and the number of strip-shaped members are designed specifically according to the actual size of the blade 220.

[0153] The strip-shaped ribs can improve the structural strength of the blade 220, reduce the impact of air flow on the blade 220, thereby alleviating the deformation of the fan member 200 during high air volume and medium-high speed rotation, improving the structural stability, and being beneficial to reducing the low-frequency vibration of the fan member 200.

[0154] In some embodiments of this application, along the direction away from the blade root 223, the shock-absorbing area 230 includes a first shock-absorbing area 231, a second shock-absorbing area 232, and a third shock-absorbing area 233. The first shock-absorbing area 231 is located at the leading edge 221 position of the blade 220. The third shock-absorbing area 233 is close to the blade tip 224, and each strip-shaped rib in the third shock-absorbing area 233 extends from the leading edge 221 to the trailing edge 222. The length of each strip-shaped rib in the second shock-absorbing area 232 gradually increases along the direction from the first shock-absorbing area 231 to the third shock-absorbing area 233.

[0155] The areas corresponding to the leading edge 221 and the blade tip 224 of the blade 220 are severely deformed. The above distribution positions of the first shock-absorbing area 231, the second shock-absorbing area 232, and the third shock-absorbing area 233 are beneficial to increasing the structural strength of the corresponding positions of the leading edge 221 and the blade tip 224 of the blade 220. It can not only weaken the vibration of the blade 220 but also inhibit the radial vortex movement on the suction surface 201.

[0156] In some embodiments of this application, the ratios of the first shock-absorbing area 231, the second shock-absorbing area 232, and the third shock-absorbing area 233 along the radial direction of the fan blade are: 5:3:2.

[0157] In other words, along the direction of the blade 220 from the blade root 223 to the blade tip 224, in the blade 220 area of 100% Span - 80% Span, the strip-shaped ribs are distributed in the entire area from the leading edge 221 to the trailing edge 222; in the area of 80% Span - 50% Span, the length of the strip-shaped ribs distributed in the trailing edge 222 area gradually decreases, and the leading edge 221 remains unchanged; in the area of 50% Span - 0% Span, the strip-shaped ribs are evenly distributed in the leading edge 221 area.

[0158] The arrangement of the strip-shaped ribs can not only weaken the vibration of the blade 220, but also suppress the radial eddy current movement on the suction surface 201.

[0159] Reference Figure 9 、 Figure 12 、 Figure 13 In some embodiments of the present application, the hub 210 includes a hub housing 211 and a bushing 213. The hub housing 211 is a cylindrical structure with an open bottom, and a first surface 214 is formed at the top of the hub housing 211.

[0160] A bushing 213 is formed at the middle position of the hub housing 211. In order to improve the strength of the hub 210, the installation position of the bushing 213 is designed at the center position of the fan member 200, so that the force on the hub 210 will be uniform.

[0161] When the fan member 200 rotates, the centrifugal force and aerodynamic force of the blade 220 will indirectly act on the fan hub 210, causing the overall deformation of the fan member 200. If the stiffness of the hub 210 is strong, the vibration amplitude of the fan will be weakened. In order to improve the overall structural strength of the hub 210, a plurality of strengthening parts 212 are formed between the bushing 213 and the hub housing 211.

[0162] The above structural composition of the hub 210 is beneficial to reducing the weight of the hub 210 on the premise of ensuring its overall structural strength.

[0163] In some embodiments of the present application, a transition concave portion 216 is formed on the first surface 214 of the hub 210 close to the air outlet 101. The upper end of the bushing 213 is higher than the lowest position of the transition concave portion 216, and a drainage portion 217 is further provided at the lowest position of the transition concave portion 216.

[0164] The design of the transition concave portion 216 is beneficial to dispersing the acting force on the first surface 214 of the hub 210, avoiding the concentration of the centrifugal force and aerodynamic force of the blade 220, and is beneficial to improving the structural strength of the entire hub 210.

[0165] The drainage portion 217 can drain the accumulated water in the transition concave portion 216, avoiding the corrosion of the hub 210 by the accumulated water in the transition concave portion 216 and affecting the service life of the hub 210.

[0166] In some embodiments of the present application, a plurality of through portions 218 are provided on the first surface 214, and the plurality of through portions 218 are arranged at intervals along the circumferential side of the bushing 213.

[0167] The through portions 218 are also beneficial to dispersing the acting force on the first surface 214 of the hub 210, and are beneficial to reducing the weight of the hub 210 and improving the working efficiency of the fan member 200.

[0168] In some other embodiments, a plurality of fixing protrusions 215 are also arranged at intervals on the first surface 214. The fixing protrusions 215 correspond to the blades 220 one by one, and the root 223 of the part of the blade 220 close to the trailing edge 222 is connected to the fixing protrusion 215.

[0169] For the air conditioner outdoor unit involved in the present application, the flow field of the fan member 200 is optimized by adjusting the projection curves of the leading edge 221 and / or the trailing edge 222 of the blade 220 in the fan member 200 in the meridian plane, the smoothness of the air flow passing through the blade 220 is improved, the flow velocity distribution on the blade 220 is controlled, so that its performance meets the design requirements, and further the static pressure coefficient and working efficiency of the fan member 200 are optimized;

[0170] In addition, by using bionic features, a shock-absorbing area 230 is formed on the pressure surface 202 of the blade 220. The shock-absorbing area 230 includes a plurality of strip-shaped ribs extending along the rotation direction of the blade 220, so as to increase the structural strength of the blade 220, improve the air intake volume, weaken the vibration at the corresponding position of the blade 220, and further reduce the low-frequency vibration of the fan member 200.

[0171] Reference Figure 14 - Figure 16 , the fan member 200 involved in the present application is compared with the existing fan member 200 in terms of the single-fan characteristics. Both groups of fan members 200 are 4-blade large-diameter fans, and their comparisons of the static pressure coefficient, static pressure efficiency, and specific noise are shown in the following figure. In the working range, at the same flow coefficient, the single-fan static pressure coefficient, static pressure efficiency, and specific noise of the fan member 200 involved in the present application are all among the better mass-produced fans.

[0172] Further comparison shows that at the target flow rate, the fan member 200 involved in the present application has higher efficiency, lower specific noise, and higher static pressure coefficient compared with the existing fan member 200.

[0173] Table 1 Comparison of single-fan performance parameters

[0174]

[0175]

[0176] Overall machine performance comparison:

[0177] To further verify the performance of the fan member 200 in the air conditioner outdoor unit, the existing fan member 200 and the fan member 200 involved in the present application are respectively placed in the air conditioner outdoor unit to test their air volume, noise, and power, and the results are as follows:

[0178] Table 2 Comparison of the overall machine performance of the fan member

[0179] Target parameter Existing fan component This fan component Gap Air volume (CMH) 15500 15500 - Rotation speed (rpm) 865 840 25↓ Power (w) 1090 1060 3％↓ Noise dB(A) 65.9 65.0 0.9 dB↓ Air loss corresponding to 80 Pa static pressure outside the machine (%) 25 20 5％↓

[0180] When the air volume is 15500 m 3 / h, the rotational speed of the fan component in this application is 25 rpm lower than that of the existing fan component, the power is 3% lower than that of the mass-produced fan, the noise is 0.9 dB lower, and the 80 Pa air volume loss is reduced by 5%.

[0181] Thus, on the premise of ensuring the power, the fan component 200 involved in this application has less air loss, lower overall rotational speed and noise.

[0182] The free modal vibration modes of the blade 220 mainly include three types: swinging, twisting, and rolling.

[0183] In the swinging mode, it is manifested as the back-and-forth swinging of the blade 220 in a specific direction. Due to the relatively low bending stiffness of the blade 220, it is prone to bending deformation when subjected to external excitation. The amplitude is small at the blade root 223 and large at the blade tip 224.

[0184] In the twisting mode, the blade 220 undergoes torsional deformation around the axis. The amplitude gradually increases from the inside to the outside, and the amplitude is the largest at the trailing edge 222 of the blade tip 224, followed by the leading edge 221 of the blade tip 224.

[0185] In the rolling mode, the blade 220 undergoes a combined vibration of swinging and torsion along its length direction and drives the hub 210 to move together. The amplitude is the largest at the trailing edge 222 of the blade tip 224, followed by the leading edge 221 of the blade tip 224.

[0186] During the operation of the fan, the two positions with the strongest vibration are the blade tip 224 and the trailing edge 222 respectively.

[0187] Refer to Figure 17 、 Figure 18 , currently, more methods of modal analysis + harmonic response are adopted to judge the resonance points and vibration conditions of the fan component 200. When the fan component 200 involved in this application is at medium and high rotational speeds of 650 - 900 rpm, the vibration amplitudes of the blade tip 224 and the trailing edge 222 of the blade 220 are both smaller than those of the mass-produced existing fan components, and the natural frequencies of the fan component involved in this application are not distributed in this rotational speed range. Therefore, its low-frequency vibration is better than that of the existing fan components.

[0188] The measured results show that the fan component designed with the key curve parameterization and bionic vibration reduction proposed in this patent has better characteristics than a certain mass-produced fan in terms of air volume, noise, efficiency, static pressure resistance, low-frequency vibration, etc.

[0189] In addition, in order to further reduce the noise, this application also further designs the structure of the air guide ring 300.

[0190] Refer to Figure 19 、 Figure 20, a plurality of air-distributing portions 310 are arranged at intervals on the inner wall of the air guide ring 300. Each air-distributing portion 310 is recessed towards the outer wall of the air guide ring 300, and each air-distributing portion 310 is angularly skewed along the air output direction for reducing noise.

[0191] The plurality of air-distributing portions 310 are evenly distributed at equal angles on the inner wall of the air guide ring 300. The design of the air-distributing portions 310 helps to change the flow path of the air flow, making the air flow velocity and pressure distribution more uniform. At the same time, it increases the friction between the air flow and the air guide ring 300, reduces the impact force of the air flow on the air guide ring 300, and avoids the disordered flow of the air flow, thereby effectively reducing the generation of noise.

[0192] In some embodiments of the present application, the air-distributing portion 310 is a wavy concave portion formed on the inner wall of the air guide ring 300 and extending outwards.

[0193] In other words, the air-distributing portion 310 is a pressing formed on the inner wall of the air guide ring 300, which is a concave structure on the inner wall of the air guide ring 300 and forms a convex structure on the outer wall of the air guide ring 300.

[0194] Each air-distributing portion 310 is arranged obliquely along the air output direction. Each air-distributing portion 310 is specifically wavy. The wavy air-distributing portion 310 helps to break the boundary layer of the air flow flowing on the inner surface of the air guide ring 300, reduce the rotational eddy current, and reduce the noise caused by the eddy current.

[0195] In some embodiments of the present application, a connecting portion 320 for connecting with the outer housing 100 is formed at the bottom of the air guide ring 300, and a reinforcing rib 321 is formed between the outer wall of the air guide ring 300 and the connecting portion 320.

[0196] The connecting portion 320 is a flat plate structure, and a smooth necking portion is formed between the connecting portion 320 and the air guide ring 300. The air flow in the air duct enters the air guide ring 300 through the necking portion.

[0197] The reinforcing rib 321 is used to improve the connection strength between the air guide ring 300 and the connecting portion 320 and improve the overall stability of the air guide ring 300.

[0198] A plurality of reinforcing ribs 330 are arranged at intervals along the height direction of the air guide ring 300 on the outer wall of the air guide ring 300. Each reinforcing rib 330 is arranged along the circumferential direction of the air guide ring 300 for improving the structural strength of the air guide ring 300.

[0199] Combined Figure 21 , in some embodiments of the present application, the outer housing 100 includes four peripheral walls. On the inner sides of the four peripheral walls of the outer housing 100, that is, on each inner wall of the outer housing 100, mounting members 120 are provided. The mounting members 120 are detachably connected to the peripheral walls of the outer housing 100 through fastening screws or the like.

[0200] The mounting member 120 and the outer housing 100 are processed separately and then assembled. A first bending portion 121 perpendicular to the inner wall of the outer housing 100 and extending into the air duct is formed on the mounting member 120, and the connecting portion 320 is detachably connected to the first bending portion 121.

[0201] The mounting member 120 provides a fixed foundation for the air guide ring 300. The mounting member 120 is pre-fixed on the inner wall of the outer housing 100, and the connecting portion 320 is fixed on the first bending portion 121 of the mounting member 120, which is convenient to operate and has high installation efficiency.

[0202] Combined Figure 22 、 Figure 23 In some embodiments of the present application, the motor bracket includes at least two support cross beams 420 arranged at intervals, and both ends of each support cross beam 420 are respectively connected to two mounting members 120 arranged oppositely.

[0203] A second bending portion 122 perpendicular to the inner wall of the outer housing 100 and extending into the air duct is formed on the corresponding mounting member 120, and both ends of the support cross beam 420 are respectively detachably connected to the second bending portion 122.

[0204] The second bending portion 122 is preset on the mounting member 120. By connecting the support cross beam 420 to the second bending portion 122, the connection and fixation with the outer housing 100 are realized, which is convenient for processing and has high assembly efficiency.

[0205] The first bending portion 121 is located on the upper edge of the mounting member 120, and the second bending portion 122 is located on the lower edge of the mounting member 120. A certain gap is formed between the first bending portion 121 and the second bending portion 122 to avoid the vibration transmission that may be caused by too small assembly clearance.

[0206] The first bending portion 121 and the second bending portion 122 are integrally formed with the mounting member 120.

[0207] In some embodiments of the present application, connection end portions 421 are respectively formed at both ends of the support cross beam 420, and a support portion 422 is further formed on the support cross beam 420. The motor member 410 is connected to the support portion 422, and the connection end portion 421 is connected to the mounting member 120.

[0208] The support cross beam 420 is fixed on the second bending portion 122 of the mounting member 120 through the connection end portions 421 at both ends. Fixing holes are provided on the support portion 422, and the motor member 410 is connected to the fixing holes through fasteners.

[0209] In some embodiments of the present application, both the connection end portion 421 and the support portion 422 are flat structures, and the other positions of the support cross beam 420 are circular tube structures.

[0210] The support cross beam 420 of the circular tube structure is beneficial to guiding the air flow to flow along the path of least resistance, enabling the air flow to pass through the surface of the motor bracket more smoothly, reducing the separation and backflow of air around the motor bracket, decreasing the formation of turbulence and eddy current, and thus reducing the resistance.

[0211] Both the connection end 421 and the support part 422 are flat structures, which facilitate the connection and fixation between the connection end 421 and the second bending part 122, and between the support part 422 and the motor component 410, are convenient for operation, and contribute to improving the structural strength and stiffness of the support cross beam 420.

[0212] In some embodiments of the present application, a transition surface is formed between the connection end 421, the support part 422 and other parts of the support cross beam 420 for the transition from the circular tube structure to the flat structure, dispersing the stress of the support cross beam 420, and improving the vibration damping performance and stability performance of the support cross beam 420.

[0213] In some embodiments of the present application, a connecting vertical part 423 extending upward is further formed at the end of the connection end 421. The connecting vertical part 423 is perpendicular to the connection end 421. The connection end 421 is supported on the second bending part 122, and the connecting vertical part 423 is fixed on the mounting part 120.

[0214] Fixing holes are provided on the connecting vertical part 423, and the fastener is fixed on the mounting part 120 through the fixing holes on the connecting vertical part 423.

[0215] In some embodiments of the present application, the position of the support part 422 on the support cross beam 420 is lower than the height of the connection end 421, and the height difference h between the upper surface of the support part 422 and the lower surface of the connection end 421 is 0 mm to 50 mm.

[0216] Motor feet 411 are provided at the bottom of the motor component 410, and the motor feet 411 are fixed on the support part 422 through fasteners.

[0217] In other words, the height difference between the lowest position where the motor component 410 is assembled and the lowest position of the support cross beam 420 is 0 mm to 50 mm.

[0218] For example but not limited to: the height difference h between the upper surface of the support part 422 and the lower surface of the connection end 421 is designed to be 25 mm.

[0219] The design of the middle position of the support cross beam 420 sinking can enable the vibration to be better dispersed and absorbed during the transmission process. When the vibration is transmitted through the bent support cross beam 420, its energy will be dispersed in different directions, thereby reducing the vibration intensity in a single direction, decreasing the vibration transmission amplitude, further enhancing the stiffness of the support cross beam 420, and reducing the deformation and displacement caused by vibration.

[0220] The above design of the support cross beam 420 helps to improve the vibration transmission of the fan unit 200, optimize the velocity distribution on the surface of the heat exchanger, enhance the heat exchanger capacity, and contribute to the improvement of the APF energy efficiency of the air conditioner.

[0221] As long as possible, the various aspects and features described and illustrated in the specification can be applied separately, and these separate aspects can be the subject of a divisional application.

[0222] In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0223] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An air conditioner outdoor unit, characterized in that: include: An outer shell having an air inlet and an air outlet formed thereon, and an air duct formed between the air inlet and the air outlet; A fan component is installed in the air duct and located inside the air outlet. The fan component includes: Wheel hub; and A plurality of blades, wherein the plurality of blades are arranged on the outer peripheral wall of the hub and are spaced apart along the circumference of the hub; a leading edge, a trailing edge, a blade tip and a blade root are formed on the blade, and a plurality of characteristic surfaces are included from the blade root to the blade tip; The leading edge distribution curve is formed by the projection of the leading edge on the blade on the meridian plane, and the points on the leading edge distribution curve are composed of the corresponding radius of each characteristic surface of the blade and the axial coordinate of the leading edge point on the characteristic surface along the hub; The trailing edge distribution curve is formed by the projection of the trailing edge on the blade on the meridian plane, and the points on the trailing edge distribution curve are composed of the corresponding radius of each characteristic surface and the axial coordinate of the trailing edge point on the characteristic surface along the hub; The points on the working angle distribution curve are composed of the working angle on each of the characteristic surfaces and the radius of the corresponding characteristic surface. The working angle is the angle between the projection of the leading edge point and the trailing edge point corresponding to each characteristic surface on the circumferential section and the line connecting the center point of the circumferential section. The circumferential section is perpendicular to the axial direction of the hub, and the center point is the projection of the central axis of the hub on the circumferential section. At least one of the leading edge distribution curve, the trailing edge distribution curve, and the operating angle distribution curve is represented by a Bessel function.

2. The air conditioner outdoor unit according to claim 1, characterized in that: From the blade root to the blade tip, the number of the characteristic surfaces is five, and at least one of the leading edge distribution curve, the trailing edge distribution curve and the operating angle distribution curve is represented by a 4th-order Bessel function.

3. The air conditioner outdoor unit according to claim 2, characterized in that: The leading edge line is controlled by 5 control points, including Q i (i=0, 1, 2, 3, 4), Q0 and Q4 represent the leading edge point of the blade root and the leading edge point of the blade tip respectively, and the leading edge distribution curve satisfies: Wherein, n is the number of control points. When the number of control points is 5, n=5.

4. The air conditioner outdoor unit according to claim 2, characterized in that: The trailing edge line is controlled by 5 control points H i (i=0, 1, 2, 3, 4), H0 and H4 represent the trailing edge point of the blade root and the trailing edge point of the blade tip respectively, and the trailing edge distribution curve satisfies: Wherein, n is the number of control points. When the number of control points is 5, n=5.

5. The air conditioner outdoor unit according to claim 2, characterized in that: The working angle distribution curve meets the following requirements: Wherein, n is the number of control points. When the number of control points is 5, n=5.

6. The air conditioner outdoor unit according to claim 1, characterized in that: The working angle g of the blade satisfies: 65°≤g≤75°, and in the direction from the blade root to the blade tip, the working angle corresponding to each characteristic surface first decreases and then increases.

7. The air conditioner outdoor unit according to claim 1, characterized in that: The angle between the connecting line between the leading edge point and the trailing edge point corresponding to the characteristic surface on the blade and the circumferential section is the installation angle. The points on the installation angle distribution curve are determined by the working angle on each characteristic surface and the radius of the corresponding characteristic surface. composition: The installation angle distribution curve satisfies:

8. The air conditioner outdoor unit according to claim 1, characterized in that: A pressure surface and a suction surface are formed on the blade, the pressure surface is located on a side close to the air outlet, a shock absorbing area is formed on the pressure surface, and the shock absorbing area includes a plurality of strip ribs formed on the pressure surface along the rotation direction of the blade.

9. The air conditioner outdoor unit according to claim 8, characterized in that: Along the direction away from the blade root, the shock absorbing area includes a first shock absorbing area, a second shock absorbing area and a third shock absorbing area, the first shock absorbing area is located at the leading edge of the blade, the third shock absorbing area is close to the blade top, and each of the strip ribs in the third shock absorbing area extends from the leading edge to the trailing edge, and the length of each of the strip ribs in the second shock absorbing area gradually increases along the direction from the first shock absorbing area to the third shock absorbing area.

10. The air conditioner outdoor unit according to claim 1, characterized in that: A transition recess is formed on the first surface of the hub member near the air outlet, a shaft sleeve is formed at the middle position of the hub member, the upper end of the shaft sleeve is higher than the lowest position of the transition recess, and a drainage portion is also provided at the lowest position of the transition recess.

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