Fan and air conditioner outdoor unit

Abstract

This invention relates to a fan and an outdoor unit for an air conditioner. The fan includes a hub and blades disposed around the hub. Each blade has a protrusion extending forward along the fan's rotation direction on its leading edge; the protrusion is located near the outer edge of the blade. Each blade also has an extension extending rearward along the fan's rotation direction on its trailing edge. This structural improvement of the blades improves airflow organization on the blade surface, increases the effective working area of ​​the blade pressure surface, increases airflow, reduces torque and noise, and improves fan efficiency.

Description

Technical Field

[0001] This invention belongs to the field of fan technology, and particularly relates to a fan and an outdoor unit for an air conditioner. Background Technology

[0002] The blades of the indoor fan in the outdoor unit of an air conditioner have many design parameters. Their shape directly affects the intensity of vortices near the blades and involves many complex flow mechanisms. The aerodynamic performance of the blades directly affects the fan's working efficiency, service life, and noise. An unreasonable fan blade shape can cause the airflow flowing over the blade surface to interfere with each other and generate vortices, causing the airflow on the blade surface to separate aerodynamically in advance, reducing the effective working area of ​​the fan on the airflow, increasing the torque generated when the fan rotates, and having a significant impact on the fan's efficiency and noise performance.

[0003] With modern life placing increasing demands on energy conservation, environmental protection, and low noise, how to effectively improve the aerodynamic performance of fan blades and reduce noise in order to improve their working efficiency has been a long-standing concern. Summary of the Invention

[0004] The purpose of this invention is to provide a fan and an outdoor air conditioner unit to solve the problems in the prior art, such as unreasonable surface curvature of the fan blades in the outdoor air conditioner unit, which causes the airflow to separate prematurely on the blade surface, increases the turbulence dissipation rate of the airflow, and results in excessive aerodynamic noise of the fan.

[0005] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0006] This invention proposes a fan comprising:

[0007] The fan includes a hub and blades disposed around the periphery of the hub;

[0008] Each blade has a protrusion extending forward along the rotation direction of the fan on its leading edge;

[0009] The protrusion is located on the side near the outer edge of the blade; each blade also has an extension that extends rearward along the rotation direction of the fan.

[0010] In some embodiments of this application, a retractable portion is formed between the protrusion and the outer edge, the retractable portion being used to guide airflow and realize the transition of airflow from the protrusion to the outer edge.

[0011] The retractable section can guide the transitional airflow, reduce the vibration frequency amplitude of the protruding section, improve turbulence, and enhance fan stability.

[0012] In some embodiments of this application, along the direction from the inner edge of the blade to the outer edge of the blade, the blade includes at least one feature surface, and the orthographic projection of the fan's pressure surface to suction surface direction is used as the reference surface, with the center position of the hub component as the origin, a rectangular coordinate system is established;

[0013] The angle between the line connecting the leading edge point and the origin of each feature surface and the Y-axis is the leading edge angle α of the corresponding feature surface. i The angle between the line connecting the trailing edge point and the origin of each feature surface and the Y-axis is the trailing edge angle β of the corresponding feature surface. i The central angle θ is the line connecting the leading edge point and the origin of each feature surface and the line connecting the trailing edge point and the origin of the corresponding feature surface. i , where θ i =α i +β i .

[0014] In some embodiments of this application, the shapes of the leading and trailing edge lines of the blade are designed by calculating the leading and trailing edge angles corresponding to each of the aforementioned feature surfaces:

[0015] Let n be the number of blades in the fan, then the circumferential angle θ of a single flow channel corresponding to a single blade is... r satisfy:

[0016] Define the leading edge angle as the angular variable y within the flow channel. qi =α i / θ r ;

[0017] The trailing edge angle variable within the flow channel is:

[0018] Define the radius R of each feature surface i The ratio of x to the blade radius R0 is x i =R i / R0;

[0019] Then, the functional relationship corresponding to the leading edge is: y qi =-16.6x i 5 +38.5x i 4 -32.2x i 2 +12.7x i +C1;

[0020] The functional relationship corresponding to the trailing edge is: y wi =18x i 5 -40.7x i4 +31.6x i 2 -11.3x i +C2;

[0021] Where C1 is the first coefficient, 1≤C1≤4; C2 is the second coefficient, -3≤C2≤-1.

[0022] In some embodiments of this application, the specific design of the protrusion and the extension can be achieved by adjusting the shape of the mid-arc line at the corresponding position of the blade:

[0023] Defined in the coordinate system, the angle in radians between the line connecting the points projected onto the feature surfaces in the coordinate system and the origin, and the X-axis, is γ. i ;

[0024] The height coefficient w of corresponding points on the mid-arc line of each feature surface i Satisfy: w i =b i / h i ;

[0025] Among them, b i h represents the height difference between the corresponding point and the lowest point on the mid-arc line of each feature surface along the fan's axis. i Leaf height;

[0026] The protrusion corresponds to the position of the nth feature surface; therefore, the mid-arc function relationship of the nth feature surface is: w i =aγ i 2 +bγ i +C3, where a is the quadratic coefficient, b is the linear coefficient, and C3 is the tertiary coefficient.

[0027] In some embodiments of this application, n=7, the inner edge of the blade is defined as the first feature surface, the outer edge of the blade is defined as the sixth feature surface, and a second feature surface, a third feature surface, a fourth feature surface, and a fifth feature surface are provided at equal intervals between the first feature surface and the sixth feature surface;

[0028] The position of the protrusion corresponds to the fifth feature surface;

[0029] The mid-arc function relationship of the fifth characteristic surface is: w5 = 0.1384γ5 2 +0.9023γ5+C3;

[0030] Wherein, 0.8≤C3≤1.5, -2.0≤γ5≤-0.12.

[0031] In some embodiments of this application, an air guide ring is also provided on the outer side of the fan. The air guide ring is located inside the air outlet. Under the action of the fan, the airflow passes through the air guide ring and is output from the air outlet.

[0032] The inner wall of the air guide ring is provided with multiple air venting sections at intervals. Each air venting section is recessed towards the outer wall of the air guide ring and is angularly deflected along the output direction of the airflow to reduce noise.

[0033] The design of the air vent helps to change the airflow path, making the airflow speed and pressure distribution more uniform. At the same time, it increases the friction between the airflow and the air guide ring, reduces the impact force of the airflow on the air guide ring, avoids turbulent airflow, and thus effectively reduces the generation of noise.

[0034] In some embodiments of this application, the bottom of the air guide ring is formed with a connecting portion for connecting with the outer shell, and a reinforcing rib is formed between the outer wall of the air guide ring and the connecting portion.

[0035] Reinforcing ribs are used to improve the connection strength between the air guide ring and the connecting part, and to improve the overall stability of the air guide ring.

[0036] In some embodiments of this application, each inner wall of the outer casing of the outdoor unit of the air conditioner is provided with a mounting component. The upper edge of the mounting component forms a first bend, and the lower edge of the mounting component forms a second bend. Both the first bend and the second bend are perpendicular to the mounting component. The connecting portion is detachably connected to the first bend, and the motor bracket is detachably connected to the second bend.

[0037] The mounting component provides a fixed base for the air guide ring. The mounting component is pre-fixed to the inner wall of the outer shell, the connecting part is fixed to the first bend of the mounting component, and the motor bracket is fixed to the second bend. It is easy to operate and has high installation efficiency.

[0038] On the other hand, this application also proposes an outdoor unit for an air conditioner, which includes:

[0039] An outer casing having an air inlet and an air outlet, with an air duct formed between the air inlet and the air outlet;

[0040] A drive assembly, comprising a motor bracket and a motor component, wherein both ends of the motor bracket are fixed to the housing, and the motor component is connected to the motor bracket;

[0041] A fan connected to the output end of the motor component; the fan includes a hub and blades disposed around the hub.

[0042] Each blade has a guide section formed on its leading and / or trailing edge, and the guide section is configured to guide the airflow smoothly out of the blade surface.

[0043] Compared with the prior art, the advantages and positive effects of the present invention are:

[0044] The fan and air conditioner outdoor unit involved in this application have a protrusion on the leading edge of the blade. The protrusion is located on the side close to the outer edge of the blade. The leading edge of the blade is used to guide the airflow into the blade. The design of the protrusion is beneficial to enhancing the stability and aerodynamic performance of the fan. Compared with the protrusion, the outer edge front end is retracted, and the position of the blade breaking the airflow is transferred to the position of the protrusion, which increases the thickness of the initial contact position between the gas and the leading edge of the blade, which is beneficial to enhancing the stability of the fan.

[0045] An extension is also formed on the trailing edge of the blade. The extension helps to sort out the airflow distribution on the blade tip surface, while delaying aerodynamic separation, reducing noise, improving the wake vortex condition at the fan trailing edge, reducing turbulent kinetic energy dissipation at this point, and thus reducing fan rotation noise.

[0046] The aforementioned structural improvements to the blades help to improve the airflow organization on the blade surface, increase the effective working area of ​​the blade pressure surface, increase air volume, reduce torque and noise, and improve fan efficiency.

[0047] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

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

[0049] Figure 1 This is a schematic diagram of the outdoor unit structure of an air conditioner according to an embodiment;

[0050] Figure 2 This is a diagram showing the fan mounting position according to an embodiment;

[0051] Figure 3 A 3D diagram of the fan;

[0052] Figure 4 This is a fan plan view;

[0053] Figure 5 This is a schematic diagram showing the definition of the blade's corresponding parameters in the coordinate system;

[0054] Figure 6 Design curves for the leading edge and trailing edge;

[0055] Figure 7 This is a schematic diagram of the arc line in the blade;

[0056] Figure 8 This is a structural diagram of the air guide ring;

[0057] Figure 9 This is a structural diagram of the air guide ring and motor bracket installation.

[0058] Figure 10 This is a structural diagram of the mounting components;

[0059] Figure 11 This is a diagram showing the connection between the fan and the drive components;

[0060] Figure label:

[0061] 100. Outer casing; 110. Air outlet; 120. Mounting component; 121. First bend; 122. Second bend;

[0062] 200. Fan;

[0063] 210. Wheel hub components;

[0064] 220. Blade; 221. Protrusion; 222. Retraction; 223. Extension; 224. Leading edge; 225. Trailing edge; 226. Inner edge; 227. Outer edge; 228. Pressure surface; 229. Suction surface;

[0065] 230. Mid-arc line;

[0066] 300. Air guide ring; 310. Air venting section; 320. Connecting part; 321. Reinforcing rib; 322. Connecting outer edge; 330. Reinforcing rib;

[0067] 400. Drive assembly; 410. Motor component; 411. Motor support foot; 420. Support beam; 421. Connecting end; 422. Support part; 423. Connecting upright part. Detailed Implementation

[0068] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0069] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0070] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0071] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0072] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0073] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0074] In this application, the air conditioner performs a refrigeration cycle by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

[0075] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0076] The expansion valve expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0077] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0078] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0079] refer to Figure 1 , Figure 2 The present invention proposes an outdoor unit for an air conditioner, which includes an outer casing 100, a fan 200, a drive assembly 400, and an air guide ring 300.

[0080] An installation cavity is formed inside the outer casing 100, in which working components such as a compressor and a heat exchanger are installed. An air inlet (not shown) and an air outlet 110 are formed on the outer casing 100. An air duct is formed between the air inlet and the air outlet 110. Airflow enters from the air inlet, passes through the air duct, and exits from the air outlet 110.

[0081] The outer side of the air outlet 110 is also equipped with a grille (not shown) to prevent foreign objects from entering the outer casing 100 and affecting the normal operation of the outdoor air conditioner unit, or to prevent animals from accidentally entering the outdoor air conditioner unit and avoiding safety hazards.

[0082] Combination Figure 11The drive assembly 400 includes a motor bracket and a motor component 410. The motor bracket is used to fix the motor component 410 inside the housing 100. The drive assembly 400 is located inside the air outlet 110. Specifically, both ends of the motor bracket are fixed to the housing 100, and the motor component 410 is connected to the motor bracket.

[0083] Fan 200 is an axial fan, which is connected to the output end of motor 410. When motor 410 is turned on, it drives fan 200 to rotate, and the airflow is driven to pass through the heat exchanger for heat exchange and then output from the air outlet 110.

[0084] Refer again Figure 1 The air guide ring 300 is set on the air outlet 110 and is located outside the fan 200. Under the action of the fan 200, the airflow passes through the air guide ring 300 and is output from the air outlet 110.

[0085] The fan 200 is connected to the output end of the motor component 410. The motor component 410 drives the fan 200 to rotate, thereby driving the airflow through the air duct and outputting it from the air outlet 110.

[0086] refer to Figure 3 , Figure 4 The fan 200 includes a hub 210 and a plurality of blades 220 arranged along the periphery of the hub 210. The blades 220 are arranged at equal angles along the periphery of the hub 210, and their number is set according to actual design requirements.

[0087] Specifically, the suction surface 229 of the blade 220 is located on the side of the fan 200 away from the air outlet 110, and the pressure surface 228 is located on the side of the fan 200 closer to the air outlet 110.

[0088] After the fan 200 is started, the suction surface 229 forms a suction force on the airflow in the air duct. After the airflow passes through the fan 200, it is pushed outward through the pressure surface 228 to the outside of the air outlet 110.

[0089] Each blade 220 has a protrusion 221 that extends forward along the rotation direction of the fan 200 on its leading edge 224.

[0090] The protrusion 221 is located on the side near the outer edge 227 of the blade 220, the inner edge 226 is the inner edge of the blade 220 near the hub 210, and the outer edge 227 is the outermost edge of the blade 220.

[0091] Each blade 220 also has an extension 223 formed on its trailing edge 225, which extends rearward along the rotation direction of the fan 200. The extension 223 is formed on the outer edge 227 of the blade 220 to improve the stability of airflow through the blade 220 and reduce noise.

[0092] In some embodiments of this application, a retractable portion 222 is formed between the protrusion 221 and the outer edge 227. The retractable portion 222 is used to guide airflow and realize the transition between the protrusion 221 and the outer edge 227.

[0093] The retractable section 222 can guide the transitional airflow, reduce the vibration frequency amplitude of the protrusion 221, improve turbulence, and enhance fan stability.

[0094] The blade shape of blade 220 is modeled after part of the structure of an albatross wing. Approximately 70% to 100% of the area near the outer edge 227 of blade 220, on the leading edge 224 and trailing edge 225, is bent and retracted. This design can effectively manage the airflow distribution on the blade tip surface, while delaying aerodynamic separation and reducing noise.

[0095] In some embodiments of this application, the thickness of the blade 220 corresponding to the protrusion 221 is greater than that of the outer edge 227, and the thickness of the blade 220 gradually decreases along the position from the protrusion 221 to the outer edge 227.

[0096] Compared to the traditional blade 220 where the tip is located on the outer edge 227, the tip of the blade 220 in this application is moved to the protrusion 221. The protrusion 221 is thicker than the outer edge 227 of the blade 220, and the corresponding contact angle of the protrusion 221 tends to be obtuse, which can reduce the contact and impact between the airflow and the blade 220, resulting in smoother airflow, enhanced stability, and reduced noise.

[0097] refer to Figure 5 To define the positions of the leading edge 224 and trailing edge 225 of the blade 220, a two-dimensional coordinate system is established in the orthographic projection direction of the fan 200.

[0098] Using the orthographic projection of the fan 200 along the direction from the pressure surface 228 to the suction surface 229 in the axial position as the reference plane, and the center position of the hub 210 as the origin, a two-dimensional rectangular coordinate system is established, where the x-axis points to the horizontal direction of the fan 200 and the y-axis points to the direction perpendicular to the x-axis extending upward.

[0099] In some embodiments, for design convenience, the y-axis passes through the intersection of the inner edge 226 and the leading edge 224.

[0100] Along the direction from the inner edge 226 of the blade 220 to the outer edge 227 of the blade 220, the blade 220 includes at least one feature surface.

[0101] The intersection of the projection of each feature surface onto the aforementioned two-dimensional coordinate system with the leading edge line is defined as the leading edge point, and the intersection with the trailing edge line is defined as the trailing edge point.

[0102] The angle between the line connecting the leading edge point and the origin of each feature surface and the Y-axis is the leading edge angle α of the corresponding feature surface.i .

[0103] The angle between the line connecting the trailing edge point and the origin of each feature surface and the Y-axis is the trailing edge angle β of the corresponding feature surface. i .

[0104] The central angle θ is the line connecting the leading edge point and the origin of each feature surface and the line connecting the trailing edge point and the origin of the corresponding feature surface. i , where θ i =α i +β i .

[0105] By calculating the leading and trailing edge angles corresponding to each feature surface, the shapes of the leading and trailing edge lines of blade 220 are designed.

[0106] Let n be the number of blades 220 in fan 200, then the circumferential angle θ of a single flow channel corresponding to a single blade 220 is... r satisfy:

[0107] Define the leading edge angle as the angular variable y within the flow channel. qi =α i / θ r ;

[0108] The trailing edge angle variable within the flow channel is:

[0109] Define the radius R of each feature surface i The ratio of x to the blade's 220 radius R0 is i =R i / R0;

[0110] Therefore, the functional relationship corresponding to the leading edge is:

[0111] y qi =-16.6x i 5 +38.5x i 4 -32.2x i 2 +12.7x i +C1;

[0112] The functional relationship corresponding to the trailing edge line is:

[0113] y wi =18x i 5 -40.7x i 4 +31.6x i 2 -11.3x i+C2;

[0114] Where C1 is the first coefficient and C2 is the second coefficient.

[0115] When the range of C1 satisfies: 1 ≤ C1 ≤ 4; and the range of C2 satisfies: -3 ≤ C2 ≤ -1; y qi The range of values ​​for y satisfies: 0.2 ≤ y qi ≤0.5; y wi The range of values ​​for y satisfies: 0.4 ≤ y wi When the value is ≤0.9, the fan blade can iterate within this value space to find the optimal aerodynamic performance scheme for Fan 200.

[0116] The curves of the leading edge and trailing edge are shown below. Figure 6 As shown.

[0117] The specific design of the protrusion 221 and the extension 223 can be achieved by adjusting the shape of the central arc 230 at the corresponding position of the blade 220.

[0118] Combination Figure 7 Defined in the coordinate system, the angle in radians between the line connecting the points projected onto the feature surfaces in the coordinate system and the origin, and the X-axis, is γ. i ;

[0119] The height coefficient w of the corresponding point on the mid-arc line 230 of each feature surface i Satisfy: w i =b i / h i ;

[0120] Among them, b i h represents the height difference between the corresponding point and the lowest point on the mid-arc line 230 of each feature surface along the axis of fan 200; i The leaf height is 220 cm.

[0121] The protrusion 221 corresponds to the position of the nth feature surface; therefore, the functional relationship of the mid-arc 230 of the nth feature surface is: w i =aγ i 2 +bγ i +C3, where a is the quadratic coefficient, b is the linear coefficient, and C3 is the tertiary coefficient.

[0122] The design of the protrusion 221 and extension 223 on the blade 220 can be achieved by adjusting the shape of the arc 230 in the fan blade and changing the blade shape of the blade 220.

[0123] The following is a method for calculating the specific shape of the arc 230 in the feature surface where the protrusion 221 and the extension 223 are located:

[0124] Combination Figure 5 , Figure 7 In some embodiments of this application, the number of blades 220 is seven, that is, n=7. The inner edge 226 of the blade 220 is defined as the first feature surface F1, and the outer edge 227 of the blade 220 is defined as the sixth feature surface F6. The second feature surface F2, the third feature surface F3, the fourth feature surface F4 and the fifth feature surface F5 are provided at equal intervals between the first feature surface F1 and the sixth feature surface F6.

[0125] The position of the protrusion 221 corresponds to the fifth feature surface. Therefore, the design of the protrusion 221 and the extension 223 is to change the position of the arc 230 in the fifth feature surface based on the existing blade 220.

[0126] Specifically, the protrusion 221 and the extension 223 are formed by moving the arc 230 corresponding to the fifth feature surface forward along the windward direction towards a predetermined position with the center of the hub 210 as the rotation center, thereby forming the protrusion 221 at the leading edge point of the fifth feature surface and forming the extension 223 between the fifth feature surface and the sixth feature surface.

[0127] In order to accurately describe the shape and size of the mid-arc line 230 corresponding to each feature surface, based on the above coordinate system, the intersection of each feature surface of the fan 200 with the leading edge line is taken as the starting point, and the intersection of each feature surface of the fan 200 with the trailing edge line is taken as the ending point.

[0128] Define the angle in radians corresponding to the line connecting the point on the fifth characteristic surface of the fan 200 pressure surface 228 under orthographic projection and the origin, and the x-axis as the forward bending angle γ5.

[0129] The height coefficient w5 of the corresponding point on the mid-arc line 230 of the fifth feature surface satisfies: w5 = b 5 / h5;

[0130] Where b5 is the height difference between the corresponding point and the lowest point on the middle arc line 230 of the fifth characteristic surface along the axis of the fan 200; h5 is the blade height of the blade 220.

[0131] The functional relationship of the mid-arc 230 of the fifth characteristic surface is as follows:

[0132] w5 = 0.1384γ5 2 +0.9023γ5+C3;

[0133] Wherein, 0.8≤C3≤1.5, -2.0≤γ5≤-0.12.

[0134] The division of the aforementioned feature surfaces of the blade 220 facilitates the positioning of the protrusion 221 and makes the design easier.

[0135] The design of the fifth feature surface in this application is conducive to accurately identifying the key blade parameters of the fan 200, and optimizing the fan blade shape in a parametric form, thereby enhancing fan efficiency and noise performance.

[0136] In some embodiments of this application, the extension 223 is located between the fifth feature surface and the sixth feature surface, and the tip of the extension 223 is located on the sixth feature surface.

[0137] The design of the extension 223 and the protrusion 221 can be understood as follows: Based on the original blade shape of the blade 220, the middle arc line 230 corresponding to the fifth feature surface is rotated forward by a preset angle along the rotation direction of the blade 220. Then, the leading edge point of the fifth feature surface protrudes forward compared to the leading edge points of the fourth and sixth feature surfaces, forming the protrusion 221. The trailing edge point of the fifth feature surface moves forward accordingly, and an extension 223 is formed between the trailing edge point of the fifth feature surface and the trailing edge point of the sixth feature surface.

[0138] The aforementioned structural improvements to blade 220 are beneficial for improving the airflow organization on the surface of blade 220, increasing the effective working area of ​​the pressure surface 228 of blade 220, increasing air volume, reducing torque and noise, and improving the working efficiency of fan 200.

[0139] On the other hand, this application also proposes an outdoor unit for an air conditioner, which includes:

[0140] The outer casing 100 has an air inlet and an air outlet 110 formed thereon, and an air duct is formed between the air inlet and the air outlet 110.

[0141] The drive assembly includes a motor bracket 411 and a motor component 410. The two ends of the motor bracket 411 are fixed to the housing 100, and the motor component 410 is connected to the motor bracket 411.

[0142] The fan 200 is connected to the output end of the motor component 410; the fan 200 includes a hub component 210 and blades 220 disposed around the hub component 210.

[0143] Each blade 220 has a guide section formed on its leading edge 224 and / or trailing edge 225. The guide section is configured to guide the airflow smoothly from the surface of the blade 220, thereby improving the airflow state on the surface of the blade 220 and reducing noise.

[0144] In one embodiment, the air guide portion is a protrusion 221 formed on the leading edge 224 of the blade 220, extending forward along the rotation direction of the fan 200.

[0145] The protrusion 221 is located on one side near the outer edge 227 of the blade 220.

[0146] A retractable portion 222 is formed between the protrusion 221 and the outer edge 227. The retractable portion 222 is used to guide the airflow and realize the transition of the airflow from the protrusion 221 to the outer edge 227.

[0147] The design of the protrusion 221 was specifically obtained through calculation of the leading edge line of the blade 220.

[0148] The design of the protrusion 221 is beneficial to enhancing the stability and aerodynamic performance of the fan. Compared with the protrusion 221, the outer edge 227 is retracted at the front end, and the position of the blade 220 breaking the airflow is transferred to the protrusion position, which increases the thickness of the initial contact position between the gas and the leading edge 224 of the blade 220, which is beneficial to enhancing the stability of the fan.

[0149] In another embodiment, the air guide portion is an extension 223 formed on the trailing edge 225 of the blade 220 and extending rearward along the rotation direction of the fan 200. The extension 223 is formed on the outer edge 227 of the blade 220.

[0150] The extension 223 is specifically obtained through linear design calculations of the trailing edge of the blade 220.

[0151] The extension 223 helps to streamline the airflow distribution on the end surface of the blade 220, while delaying aerodynamic separation, reducing noise, improving the wake vortex condition at the fan trailing edge, reducing turbulent kinetic energy dissipation at this location, and thus reducing fan rotation noise.

[0152] In addition, to further reduce noise, this application has further designed the structure of the air guide ring 300.

[0153] refer to Figure 2 , Figure 8 Multiple air venting sections 310 are spaced apart on the inner wall of the air guide ring 300. Each air venting section 310 is recessed towards the outer wall of the air guide ring 300 and is angled along the output direction of the airflow to reduce noise.

[0154] Multiple air venting sections 310 are evenly distributed on the inner wall of the air guide ring 300. The design of the air venting section 310 helps to change the flow path of the airflow, making the speed and pressure distribution of the airflow more uniform. At the same time, it increases the friction between the airflow and the air guide ring 300, reduces the impact force of the airflow on the air guide ring 300, avoids turbulent airflow, and thus effectively reduces the generation of noise.

[0155] In some embodiments of this application, the air vent 310 is a wavy recess formed on the inner wall of the air guide ring 300 and extending outward.

[0156] In other words, the air venting part 310 is a pressed shape formed on the inner wall of the air guide ring 300, which has a concave structure on the inner wall of the air guide ring 300 and a convex structure on the outer wall of the air guide ring 300.

[0157] Each air vent 310 is obliquely arranged along the output direction of the airflow. Specifically, each air vent 310 is wave-shaped. The wave-shaped air vent 310 helps to break the boundary layer of the airflow flowing on the inner surface of the air guide ring 300, reduce the rotating vortex, and reduce the noise caused by the vortex.

[0158] In some embodiments of this application, the bottom of the air guide ring 300 is formed with a connecting portion 320 for connecting with the outer shell 100, and a reinforcing rib 321 is formed between the outer wall of the air guide ring 300 and the connecting portion 320.

[0159] The connecting part 320 has a flat plate structure, and a smooth constriction is formed between the connecting part 320 and the air guide ring 300. The airflow in the air duct enters the air guide ring 300 through the constriction.

[0160] The reinforcing rib 321 is used to improve the connection strength between the air guide ring 300 and the connecting part 320, and to improve the overall stability of the air guide ring 300.

[0161] Multiple reinforcing ribs 330 are spaced apart on the outer wall of the air guide ring 300 along the height direction of the air guide ring 300. Each reinforcing rib 330 is arranged along the circumference of the air guide ring 300 to improve the structural strength of the air guide ring 300.

[0162] Combination Figure 2 , Figure 9 , Figure 10 In some embodiments of this application, the outer shell 100 includes four peripheral walls. On the inner side of the four peripheral walls of the outer shell 100, that is, on each inner wall of the outer shell 100, a mounting member 120 is provided. The mounting member 120 is detachably connected to the peripheral wall of the outer shell 100 by fastening screws or the like.

[0163] The mounting component 120 and the outer casing 100 are assembled after being processed separately. The mounting component 120 has a first bend 121 that extends into the air duct perpendicular to the inner wall of the outer casing 100. The connecting part 320 is detachably connected to the first bend 121.

[0164] Mounting component 120 provides a fixed base for air guide ring 300. Mounting component 120 is pre-fixed to the inner wall of outer shell 100, and connecting part 320 is fixed to the first bent part 121 of mounting component 120. It is easy to operate and has high installation efficiency.

[0165] Combination Figure 9 , Figure 11In some embodiments of this application, the motor bracket includes at least two support beams 420 spaced apart, with each support beam 420 having its two ends connected to two mounting members 120 arranged opposite to each other.

[0166] The mounting component 120 has a second bend 122 that extends into the air duct perpendicular to the inner wall of the outer casing 100, and the two ends of the support beam 420 are detachably connected to the second bend 122.

[0167] The mounting component 120 has a pre-set second bend 122. The support beam 420 is connected to the outer shell 100 by connecting with the second bend 122, which is convenient for processing and has high assembly efficiency.

[0168] The first bend 121 is located at the upper edge of the mounting part 120, and the second bend 122 is located at the lower edge of the mounting part 120. A certain gap is formed between the first bend 121 and the second bend 122 to avoid vibration transmission that may occur due to an excessively small assembly gap.

[0169] The first bend 121 and the second bend 122 are integrally formed with the mounting part 120.

[0170] In some embodiments of this application, the two ends of the support beam 420 are respectively formed with connecting ends 421, and the support beam 420 is also formed with a support portion 422. The motor component 410 is connected to the support portion 422, and the connecting ends 421 are connected to the mounting component 120.

[0171] The support beam 420 is fixed to the second bent portion 122 of the mounting part 120 through the connecting ends 421 at both ends. The support portion 422 is provided with fixing holes, and the motor part 410 is connected to the fixing holes through fasteners.

[0172] In some embodiments of this application, the connecting end 421 and the support part 422 are both flat structures, while the other parts of the support beam 420 are circular tube structures.

[0173] The circular tube structure of the support beam 420 helps guide the airflow along the path of least resistance, allowing the airflow to pass more smoothly over the surface of the motor bracket, reducing air separation and backflow around the motor bracket, reducing the formation of turbulence and thus reducing resistance.

[0174] Both the connecting end 421 and the support part 422 are flat structures, which facilitates the connection and fixation between the connecting end 421 and the second bending part 122, and between the support part 422 and the motor component 410, making operation convenient and helping to improve the structural strength and rigidity of the support beam 420.

[0175] In some embodiments of this application, a transition surface is formed between the connecting end 421, the support portion 422 and other parts of the support beam 420, for the transition from a circular tube structure to a flat structure, so as to disperse the stress of the support beam 420 and improve the vibration reduction performance and stability of the support beam 420.

[0176] In some embodiments of this application, the end of the connecting end 421 is further provided with an upwardly extending connecting stand 423, which is perpendicular to the connecting end 421. The connecting end 421 is supported on the second bent portion 122, and the connecting stand 423 is fixed on the mounting member 120.

[0177] The connecting upright 423 is provided with a fixing hole, and the fastener is fixed to the mounting part 120 through the fixing hole part connecting upright 423.

[0178] In some embodiments of this application, the position of the support portion 422 on the support beam 420 is lower than the height of the connecting end 421, and the height difference h between the upper surface of the support portion 422 and the lower surface of the connecting end 421 is 0mm to 50mm.

[0179] The bottom of the motor component 410 is provided with a motor support foot 411, which is fixed to the support part 422 by fasteners.

[0180] In other words, the height difference between the lowest position of the motor component 410 and the lowest position of the support beam 420 is 0mm to 50mm.

[0181] For example, but not limited to: the height difference h between the upper surface of the support 422 and the lower surface of the connecting end 421 is designed to be 25mm.

[0182] The design of the middle position of the support beam 420 is lowered so that the vibration is better dispersed and absorbed during transmission. When the vibration is transmitted through the curved support beam 420, its energy will be dispersed in different directions, thereby reducing the vibration intensity in a single direction, reducing the vibration transmission amplitude, and thus enhancing the stiffness of the support beam 420 and reducing the deformation and displacement caused by vibration.

[0183] The aforementioned design of the supporting beam 420 helps to improve the vibration transmission of the fan 200, optimize the velocity distribution on the heat exchanger surface, enhance the heat exchanger capacity, and contribute to the improvement of the air conditioner's APF energy efficiency.

[0184] Whenever possible, the various aspects and features described and shown in the specification can be applied individually, and these individual aspects can serve as the subject of a divisional application.

[0185] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0186] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A fan, characterized in that, include: The fan includes a hub and blades disposed around the periphery of the hub; Each blade has a protrusion extending forward along the rotation direction of the fan on its leading edge; The protrusion is located on the side near the outer edge of the blade; each blade also has an extension that extends rearward along the rotation direction of the fan.

2. The fan according to claim 1, characterized in that, A retractable portion is formed between the protrusion and the outer edge. The retractable portion is used to guide the airflow and realize the transition of the airflow from the protrusion to the outer edge.

3. The fan according to claim 1, characterized in that, Along the direction from the inner edge of the blade to the outer edge of the blade, the blade includes at least one feature surface. A rectangular coordinate system is established with the orthographic projection of the fan's pressure surface to suction surface direction as the reference surface and the center position of the hub as the origin. The angle between the line connecting the leading edge point and the origin of each feature surface and the Y-axis is the leading edge angle α of the corresponding feature surface. i The angle between the line connecting the trailing edge point and the origin of each feature surface and the Y-axis is the trailing edge angle βi of the corresponding feature surface, and the line connecting the leading edge point and the origin of each feature surface with the line connecting the trailing edge point and the origin of the corresponding feature surface is the central angle θ. i , where θ i =α i +β i .

4. The fan according to claim 3, characterized in that, By calculating the leading and trailing edge angles corresponding to each of the aforementioned feature surfaces, the shapes of the leading and trailing edge lines of the blade are designed: Let n be the number of blades in the fan, then the circumferential angle θ of a single flow channel corresponding to a single blade is... r satisfy: Define the leading edge angle as the angular variable y within the flow channel. qi =α i / θ r ; The trailing edge angle variable within the flow channel is: Define the radius R of each feature surface i The ratio of x to the blade radius R0 is x i =R i / R0; Then, the functional relationship corresponding to the leading edge is: y qi =-16.6x i 5 +38.5x i 4 -32.2x i 2 +12.7x i +C1; The functional relationship corresponding to the trailing edge is: y wi =18x i 5 -40.7x i 4 +31.6x i 2 -11.3x i +C2; Where C1 is the first coefficient, 1≤C1≤4; C2 is the second coefficient, -3≤C2≤-1.

5. The fan according to claim 3, characterized in that, The specific design of the protrusion and the extension can be achieved by adjusting the shape of the mid-arc line at the corresponding position of the blade: Defined in the coordinate system, the angle in radians between the line connecting the points projected onto the feature surfaces in the coordinate system and the origin, and the X-axis, is γ. i ; The height coefficient w of corresponding points on the mid-arc line of each feature surface i Satisfy: w i =b i / h i ; Among them, b i h represents the height difference between the corresponding point and the lowest point on the mid-arc line of each feature surface along the fan's axis. i Leaf height; The protrusion corresponds to the position of the nth feature surface; therefore, the arc function relationship of the nth feature surface is: w i =aγ i 2 +bγ i +C3, where a is the quadratic coefficient, b is the linear coefficient, and C3 is the tertiary coefficient.

6. The fan according to claim 5, characterized in that, Where n=7, the inner edge of the blade is defined as the first feature surface, the outer edge of the blade is defined as the sixth feature surface, and the second feature surface, the third feature surface, the fourth feature surface and the fifth feature surface are provided at equal intervals between the first feature surface and the sixth feature surface; The position of the protrusion corresponds to the fifth feature surface; The mid-arc function relationship of the fifth characteristic surface is: w5 = 0.1384γ5 2 +0.9023γ5+C3; Wherein, 0.8≤C3≤1.5, -2.0≤γ5≤-0.

12.

7. An outdoor unit for an air conditioner, characterized in that, Includes the fan according to any one of claims 1-6 The outdoor unit of the air conditioner includes an air guide ring, which is located outside the fan and inside the air outlet. Under the action of the fan, the airflow passes through the air guide ring and is output from the air outlet. The inner wall of the air guide ring is provided with multiple air venting sections at intervals. Each air venting section is recessed towards the outer wall of the air guide ring and is angularly deflected along the output direction of the airflow to reduce noise.

8. The outdoor unit of the air conditioner according to claim 7, characterized in that, The bottom of the air guide ring has a connecting portion for connecting with the outer shell, and a reinforcing rib is formed between the outer wall of the air guide ring and the connecting portion.

9. The outdoor unit of the air conditioner according to claim 8, characterized in that, Each inner wall of the outer casing is provided with a mounting component. The upper edge of the mounting component forms a first bend, and the lower edge of the mounting component forms a second bend. Both the first bend and the second bend are perpendicular to the mounting component. The connecting part is detachably connected to the first bend, and the motor bracket is detachably connected to the second bend.

10. The outdoor unit of the air conditioner according to claim 7, characterized in that, The outdoor unit of the air conditioner also includes: The drive assembly includes a motor bracket and a motor component. The two ends of the motor bracket are fixed to the housing, and the motor component is connected to the motor bracket. The fan is connected to the output end of the motor component.

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