Impeller assembly, blade design method for impeller assembly, fan assembly and air conditioner

Abstract

The invention discloses an impeller assembly, a blade design method for the impeller assembly, a fan assembly and an air conditioner, the impeller assembly comprises a base plate and blades, each blade is provided with a plurality of control points spaced from one another in the radial direction, the original coordinate of each control point relative to the coordinates of the blades is Pi = (xi, yi), the node vector of any point on the pressure surface and / or the suction surface is t and meets Bi3 (t); wherein the surface curve of the pressure surface and / or the suction surface meets the condition that wi is a weight factor. According to the impeller assembly designed by the invention, the blade profile is drawn by adopting a three-order six-control-point NURBS curve, and the surface curve of the blade can be further refined under the constraint of satisfying the rough shape of the blade, so that the blade profile still has reasonable curve change.

Description

Technical Field

[0001] This invention relates to the field of impeller blade design, and in particular to an impeller assembly, a blade design method for an impeller assembly, a fan assembly, and an air conditioner. Background Technology

[0002] In related technologies, impellers are equipped with blades that guide the airflow direction as the impeller rotates. In the field of multi-blade forward-curved centrifugal fans, the blade's work capacity can be altered by designing its blade shape. Some existing technologies use NURBS curves (non-uniform rational B-spline curves) to design blade shapes. The surface node vectors can be non-equidistantly distributed, and the concept of control point weights is introduced. Larger weights bring the curve closer to the control point, while smaller weights move it further away. However, these existing NURBS curve blade design methods offer limited descriptions of the overall design of the pressure and suction surface profiles of forward-curved centrifugal fan blades, lacking specific mathematical relationships. Furthermore, since most of these technologies are based on design methods using mid-curve curves and thickness distribution, they suffer from insufficient freedom in blade shape adjustment. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, one objective of this invention is to propose an impeller assembly. The impeller assembly designed according to this invention uses a third-order, six-control-point NURBS curve to draw the blade profile, which can further refine the blade surface curve while satisfying the constraints of the general blade shape, ensuring that the blade profile still has reasonable curve variations.

[0004] The present invention also proposes a blade design method for the above-mentioned impeller assembly.

[0005] The present invention also proposes a fan assembly having the above-described impeller assembly.

[0006] The present invention also proposes an air conditioner having the above-mentioned impeller assembly or fan assembly.

[0007] The impeller assembly according to the present invention includes: a base plate, the base plate being annular; blades, the blades being disposed on the base plate and configured as a plurality of blades spaced apart along the outer periphery of the base plate, the two side surfaces of the blades in the thickness direction being a pressure surface and a suction surface, respectively; each blade having a plurality of control points spaced apart in the radial direction, the original coordinates of each control point relative to the blade being P. i =(x i ,y i The node vector of any point on the pressure surface and / or the suction surface is t and satisfies:

[0008]

[0009] The surface curves of the pressure surface and / or the suction surface satisfy the following: The w i This is the weighting factor.

[0010] The impeller assembly designed according to the present invention uses a third-order, six-control-point NURBS curve to construct its blade profile, making the overall curvature change smoother and the flow in the blade passage smoother. This effectively reduces flow loss, increases air volume, and reduces noise. Furthermore, the constraints of this NURBS curve construction depend on the custom inlet and outlet installation angles, initial thickness, and intermediate thickness. Under the premise of satisfying the general shape of the blade, the blade surface curve can be further refined. This allows the blade profile to still have a reasonable curve change under the constraints of a larger outlet installation angle β2, a smaller inlet installation angle β1, and a certain chord length and blade center angle OCC. Moreover, with more control points, local fine-tuning of the blade profile can be achieved, and the curve adjustment is more flexible.

[0011] According to some embodiments of the present invention, the inner diameter of the substrate is D1, the outer diameter is D2, the leading edge thickness of the blade is σ1, the trailing edge thickness of the blade is σ2, and the maximum thickness of the blade is σm, satisfying: σ1, σ2∈[0.008D2,0.01D2], σ m ∈[0.015D2,0.018D2]. The above implementation method makes the leaf shape controllable, which facilitates the adjustment to the desired leaf shape.

[0012] According to some embodiments of the present invention, the angle between the first tangent at the front edge of the pressure surface and the second tangent at the intersection of the substrate and the front edge of the pressure surface is β1-1, and satisfies: 70°≤β1-1≤90°; the angle between the third tangent at the rear edge of the pressure surface and the fourth tangent at the intersection of the substrate and the rear edge of the pressure surface is β2-1, and satisfies: 140°≤β2-1≤170°; the angle between the fifth tangent at the front edge of the suction surface and the sixth tangent at the intersection of the substrate and the front edge of the suction surface is β1-2, and satisfies: 70°≤β1-2≤90°; the angle between the seventh tangent at the rear edge of the suction surface and the eighth tangent at the intersection of the substrate and the rear edge of the suction surface is β2-2, and satisfies: 140°≤β2-2≤170°. The above-described implementation allows the inlet installation angle β1 and outlet installation angle β2 of the blade to be freely adjusted within corresponding ranges, enabling the drawing of the approximate blade shape. This makes the blade shape controllable and facilitates adjustments based on the specified dimensions. Draw the NURBS curve to adjust the desired leaf shape.

[0013] According to some embodiments of the present invention, the leading edge of the blade protrudes radially inward from the substrate. The above embodiments can guide airflow, allowing it to flow from the airflow inlet towards the blade passage between the blades, resulting in smoother flow and less resistance.

[0014] According to some embodiments of the present invention, the portions of the pressure surface and the suction surface located at the leading edge of the blade are connected by a transition surface, wherein the transition surface is constructed as an elliptical surface tangent to both the pressure surface and the suction surface. The above embodiments can ensure that the inlet installation angle β1 remains unchanged and appropriately increase the blade chord length to further increase the blade's work capacity.

[0015] The following is a brief description of a blade design method for an impeller assembly according to a second aspect of the present invention, wherein the impeller assembly is constructed as described in any of the above embodiments.

[0016] The blade design method for impeller assemblies according to the present invention includes: S1, according to

[0017]

[0018] Determine the basis functions; S2, according to Plot the surface curves of the blade pressure surface and / or the suction surface.

[0019] The blade design method for impeller assemblies according to the present invention can further refine the blade surface curve based on the defined approximate shape of the blade, so that the blade shape can still have a reasonable curve change under certain constraints. The blade shape can eliminate flow separation at the blade inlet, thereby reducing the overall flow loss of the impeller.

[0020] According to some embodiments of the present invention, the angle between the first tangent at the front edge of the pressure surface and the second tangent at the intersection of the substrate and the front edge of the pressure surface is β1-1; the angle between the third tangent at the rear edge of the pressure surface and the fourth tangent at the intersection of the substrate and the rear edge of the pressure surface is β2-1; the angle between the fifth tangent at the front edge of the suction surface and the sixth tangent at the intersection of the substrate and the front edge of the suction surface is β1-2; the angle between the seventh tangent at the rear edge of the suction surface and the eighth tangent at the intersection of the substrate and the rear edge of the suction surface is β2-2; the "S1, according to "Determining the basis functions" includes: S01, determining the basis functions, node positions, control point positions, and control point weights based on β1-1, β2-1, β1-2, and β2-2. The above implementation method can perform preliminary design of the blade profile to define the approximate shape of the blade, thereby determining the basis functions, node positions, control point positions, and control point weights. Then, the blade surface curve is further refined using a third-order six-control-point NURBS curve. This allows the blade profile to maintain a reasonable curve variation even under constraints such as a larger outlet installation angle β2, a smaller inlet installation angle β1, and a certain chord length and blade center angle OCC.

[0021] According to some embodiments of the present invention, the

[0022] S1, according to "Determining the basis function" also includes: S02, determining the thickness distribution curve of the overall blade shape based on the leading edge thickness, trailing edge thickness, and maximum blade thickness, in order to design the shape of the blade. The above implementation can define the approximate blade shape. Under the constraint of satisfying the approximate blade shape, the blade surface curve can be further refined so that the blade shape still has reasonable curve variations.

[0023] The following is a brief description of a wind turbine assembly according to a third aspect embodiment of the present invention.

[0024] The fan assembly according to the present invention includes the impeller assembly of any one of the above embodiments. Since the fan assembly according to the present invention is provided with the impeller assembly of the above embodiments, the fan assembly has higher working efficiency.

[0025] An air conditioner according to a fourth aspect embodiment of the present invention is briefly described below.

[0026] The air conditioner according to the present invention includes the impeller assembly or fan assembly as described in any of the above embodiments. Since the air conditioner according to the present invention is provided with the impeller assembly or fan assembly of the above embodiments, the user experience of the air conditioner is better.

[0027] In summary, the impeller assembly designed according to the present invention has a blade profile constructed using a third-order, six-control-point NURBS curve. This allows for further refinement of the blade surface curve while satisfying the constraints of the blade's approximate shape, ensuring that the blade profile still exhibits reasonable curve variations. This results in smoother flow and less resistance in the blade passage between blades.

[0028] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0030] Figure 1 This is a schematic diagram of the impeller assembly structure according to an embodiment of the present invention.

[0031] Figure 2 This is a simulation cloud diagram of the impeller assembly during operation according to an embodiment of the present invention.

[0032] Figure 3 This is a schematic diagram of the blade structure according to an embodiment of the present invention.

[0033] Figure 4 yes Figure 3 Schematic diagram of the dimensions of the pressure surface of the middle blade.

[0034] Figure 5 yes Figure 3 Schematic diagram of the suction surface dimensions of the middle blade.

[0035] Figure 6 yes Figure 3 A schematic diagram showing the location of the control points corresponding to the pressure surface of the intermediate blade.

[0036] Figure 7 yes Figure 3 A schematic diagram showing the location of the control points corresponding to the suction surface of the blade.

[0037] Figure 8 This is a blade design method for impeller assemblies according to some embodiments of the present invention.

[0038] Figure 9 This is a blade design method for impeller assemblies according to other embodiments of the present invention.

[0039] Figure 10 This is a schematic diagram of the wind turbine assembly structure according to an embodiment of the present invention.

[0040] Figure label:

[0041] 1. Impeller assembly; 100. Fan assembly;

[0042] 10. Substrate;

[0043] 20. Blade; 21. Pressure surface; 22. Suction surface; 23. Transition surface; P, Control point;

[0044] a. First tangent; b. Second tangent; c. Third tangent; d. Fourth tangent; e. Fifth tangent; f. Sixth tangent; g. Seventh tangent; h. Eighth tangent. Detailed Implementation

[0045] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," 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 invention 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 invention.

[0047] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] 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.

[0050] In related technologies, impellers are equipped with blades that guide the airflow direction as the impeller rotates. In the field of multi-blade forward-curved centrifugal fans, the blade's work capacity can be altered by designing its blade shape. Some existing technologies use NURBS curves (non-uniform rational B-spline curves) to design blade shapes. The surface node vectors can be non-equidistantly distributed, and the concept of control point weights is introduced. Larger weights bring the curve closer to the control point, while smaller weights move it further away. However, these existing NURBS curve blade design methods offer limited descriptions of the overall design of the pressure and suction surface profiles of forward-curved centrifugal fan blades, lacking specific mathematical relationships. Furthermore, since most of these technologies are based on design methods using mid-curve curves and thickness distribution, they suffer from insufficient freedom in blade shape adjustment.

[0051] The following is for reference. Figures 1-7 An impeller assembly 1 according to an embodiment of the present invention is described.

[0052] like Figures 1-7 As shown, the impeller assembly 1 according to the present invention includes: a base plate 10 and blades 20. The base plate 10 is annular in structure. The blades 20 are disposed on the base plate 10 and are configured as a plurality of blades spaced apart along the outer periphery of the base plate 10. The two side surfaces of the blades 20 in the thickness direction are a pressure surface 21 and a suction surface 22, respectively. Each blade 20 is provided with a plurality of control points P that are radially spaced apart from each other. The original coordinates of each control point P relative to the blade 20 are P_0, P_1, P_2, P_3, P_4, P_5, P_6, P_7, P_8, P_9, P_1, P_1, P_1, P_2 ... i =(x i ,y i The nodal vector of any point on the pressure surface 21 and / or suction surface 22 is t and satisfies:

[0053] The surface curves of pressure surface 21 and / or suction surface 22 satisfy the following: w i This is the weighting factor.

[0054] Specifically, NURBS curves can be used throughout the entire process of blade 20 profile design. (See reference here.) Figure 3The blade 20 has an airfoil composed of a pressure surface 21 and a suction surface 22, and the pressure surface 21 and suction surface 22 are constructed as two NURBS curves. In this patent, the main constraint parameters of the blade 20 airfoil design are the inlet installation angle β1 (for the pressure surface 21, the inlet installation angle is β1-1; for the suction surface 22, the inlet installation angle is β1-2), the outlet installation angle β2 (for the pressure surface 21, the outlet installation angle is β2-1; for the suction surface 22, the outlet installation angle is β2-2), the impeller outer diameter D2, the impeller inner diameter D1, the blade 20 center angle OCC, the blade 20 leading edge thickness σ1, the blade 20 maximum thickness σm, and the blade 20 trailing edge thickness σ2. Among them, the outlet installation angle β2 and the impeller outer diameter D2 have the greatest impact on the increase or decrease of impeller air volume. The impeller outer diameter D2, the impeller inner diameter D1, and the center angle OCC of blade 20 determine the chord length of blade 20. The leading edge thickness σ1, the maximum thickness σm, and the trailing edge thickness σ2 of blade 20 together constrain the general thickness distribution of blade 20.

[0055] The blade profile of blade 20 can be initially designed by considering the inlet installation angle β1, outlet installation angle β2, impeller outer diameter D2, impeller inner diameter D1, blade center angle OCC, blade leading edge thickness σ1, blade maximum thickness σm, and blade trailing edge thickness σ2. This allows for the initial determination of the approximate shape of blade 20. Then, a third-order six-control-point NURBS curve is introduced to further refine the surface curve of blade 20. This allows for reasonable curve variations in blade profile even under constraints of a larger outlet installation angle β2, a smaller inlet installation angle β1, a certain chord length, and blade center angle OCC. Furthermore, the presence of multiple control points P enables local fine-tuning of the blade profile, resulting in smaller local curvature abrupt changes compared to overall curvature abrupt changes. This leads to smoother flow and lower resistance between blades 20 in the blade passage.

[0056] You can refer to this. Figure 2 The simulated cloud map, using NURBS curves and the blade 20 design process described in this patent, shows that the blade 20 shape can eliminate flow separation at the inlet of the blade 20, thereby reducing the overall flow loss of the impeller and achieving a simulated air volume increase rate of 10.9%.

[0057] More specifically, the NURBS curve of at least one of the pressure surface 21 and the suction surface 22 adopts a third-order basis function with six control points P, and the NURBS curve satisfies the following relation: Where P i Let P be the two-dimensional coordinates of the control point P. i =(x i ,y i The control points P are six in total, i = 0, 1, 2, 3, 4, 5. The curve between any two adjacent control points P is an arc segment.i P i-1 The distances can be equidistant or unequal, and the specific location of the control point P is not limited; it can be randomly selected without changing the approximate shape of the blade 20. i Represents the weighting factor; generally, 1 ≥ w i ≥0 indicates that the higher the weight value, the closer the NURBS curve is to the control point P; the lower the weight value, the further the NURBS curve is from the control point P. This patent does not limit the specific value of the weight factor; the weight factor can be freely selected within the allowable range to achieve different curvature variations. i,k (t) is generally a basis function, where k represents the order, and this patent uses the third order, and t represents the node vector.

[0058] Taking the NURBS curve of pressure surface 21 as an example, the expression of the third-order basis function in this patent is as follows:

[0059] According to B i3 (t) can obtain the basis functions corresponding to the control point P. By assigning a weight value to each control point P, the curve or surface can more flexibly adapt to various geometric shapes. In blade design, the drawn shape can meet the design requirements, thereby eliminating flow separation in the blade passage and increasing the blade's work capacity by 20. The basis functions corresponding to multiple control points P are obtained through the relational formula. It can draw NURBS curves to realize the drawing of pressure surface 21.

[0060] In some embodiments, both the pressure surface 21 and the suction surface 22 can be plotted using the above method to achieve the design of the blade shape of the blade 20.

[0061] According to the impeller assembly 1 designed in this invention, the blade 20 is constructed using a third-order NURBS curve with six control points P, which makes the overall curvature change smoother, resulting in smoother flow in the blade passage. This effectively reduces flow loss, increases air volume, and reduces noise. Furthermore, the constraints of this NURBS curve construction depend on the custom inlet and outlet installation angles, initial thickness, and intermediate thickness. Under the premise of satisfying the approximate shape of the blade 20, the surface curve of the blade 20 can be further refined. This allows the blade 20 to still have a reasonable curve change under the constraints of a larger outlet installation angle β2, a smaller inlet installation angle β1, a certain chord length, and the central angle OCC of the blade 20. Moreover, with more control points P, local fine-tuning of the blade shape can be achieved, and the curve adjustment is more flexible.

[0062] According to some embodiments of the present invention, such as Figure 4As shown, the inner diameter of the substrate 10 is D1, the outer diameter is D2, the leading edge thickness of the blade 20 is σ1, the trailing edge thickness of the blade 20 is σ2, and the maximum thickness of the blade 20 is σm, satisfying: σ1, σ2∈[0.008D2,0.01D2], σ m ∈[0.015D2,0.018D2]. Specifically, the thickness of the blade 20 at various points can be freely adjusted within the corresponding range to achieve local changes in the curve of the blade 20, thereby obtaining the desired gradient blade shape. This implementation method makes the blade shape of the blade 20 controllable and easy to adjust to the desired blade shape.

[0063] According to some embodiments of the present invention, such as Figure 4 , Figure 5 As shown, the angle between the first tangent a at the leading edge of the pressure surface 21 and the second tangent b at the intersection of the substrate 10 and the leading edge of the pressure surface 21 is β1-1, and satisfies: 70°≤β1-1≤90°; the angle between the third tangent c at the trailing edge of the pressure surface 21 and the fourth tangent d at the intersection of the substrate 10 and the trailing edge of the pressure surface 21 is β2-1, and satisfies: 140°≤β2-1≤170°; the angle between the fifth tangent e at the leading edge of the suction surface 22 and the sixth tangent f at the intersection of the substrate 10 and the leading edge of the suction surface 22 is β1-2, and satisfies: 70°≤β1-2≤90°; the angle between the seventh tangent g at the trailing edge of the suction surface 22 and the eighth tangent h at the intersection of the substrate 10 and the trailing edge of the suction surface 22 is β2-2, and satisfies: 140°≤β2-2≤170°. Specifically, the leading edges of the pressure surface 21 and the suction surface 22 are located at the airflow inlet end of the blade 20. For the pressure surface 21, the inlet installation angle at the airflow inlet end is β1-1, and for the suction surface 22, the inlet installation angle is β1-2. The trailing edges of the pressure surface 21 and the suction surface 22 are located at the airflow outlet end of the blade 20. For the pressure surface 21, the outlet installation angle at the airflow outlet end is β2-1, and for the suction surface 22, the outlet installation angle is β2-2. β1-1, β1-2, β2-1, and β2-2 satisfy corresponding ranges so that the inlet installation angle β1 and the outlet installation angle β2 of the blade 20 can be freely adjusted within the corresponding range, realizing the approximate blade shape of the blade 20, making the blade shape controllable, and facilitating the drawing of the approximate blade shape of the blade 20. Draw the NURBS curve to adjust the desired leaf shape (20).

[0064] According to some embodiments of the present invention, such as Figure 4 As shown, the leading edge of the blade 20 protrudes radially inside the substrate 10 to guide the airflow, allowing the airflow to flow from the airflow inlet end toward the blade passage between the blades 20, and the flow is smoother and the resistance is smaller.

[0065] According to some embodiments of the present invention, such as Figure 3 As shown, the pressure surface 21 and the suction surface 22 located at the leading edge of the blade 20 are connected by a transition surface 23. The transition surface 23 is constructed as an elliptical surface that is tangent to both the pressure surface 21 and the suction surface 22. Specifically, the pressure surface 21 and the suction surface 22 located at the leading edge of the blade 20 are smoothly transitioned by an elliptical curve, which is the transition surface 23. The curves on both sides of the ellipse are tangent to the pressure surface 21 and the suction surface 22, respectively. This ensures that the inlet installation angle β1 does not deform and appropriately increases the chord length of the blade 20 to further increase the work capacity of the blade 20.

[0066] In some embodiments, the length of the long end of the transition surface 23 is approximately 0.02D2, and the length of the short end of the transition surface 23 is approximately equal to σ1.

[0067] The NURBS curve-based blade design method proposed in this invention directly constructs two NURBS curves for the pressure surface 21 and suction surface 22 of the forward centrifugal blade 20. Using key design parameters as the primary constraints (inlet installation angle, outlet installation angle, impeller inner and outer diameters, center angle, outlet thickness, inlet thickness, and maximum thickness—eight degrees of freedom), and allowing for free adjustment of other constraints, the blade shape variations become more diverse and curvature abrupt changes are reduced. Furthermore, by designing two NURBS curves for the pressure surface 21 and suction surface 22, and constraining the basic thickness variation of the blade shape with the leading edge, trailing edge, and maximum thickness, more degrees of freedom are given to the blade shape design. This allows for the adjustment of more varied blade shapes with smaller curvature abrupt changes, effectively reducing flow separation within the blade passage and increasing the output air volume. Simulation verification shows that the air volume improvement rate using this design can reach 10.9%.

[0068] The following is a brief description of the blade design method for an impeller assembly according to the present invention, wherein the impeller assembly is constructed as described in any of the above embodiments.

[0069] like Figure 8 As shown, the blade design method for impeller assemblies according to the present invention includes:

[0070] S1, according to Determine the basis functions;

[0071] S2, according to Plot the surface curves of the blade pressure surface and / or the suction surface.

[0072] Here, according to B i3 (t) can obtain the basis functions corresponding to the control point. By assigning a weight value to each control point, the curve or surface can more flexibly adapt to various geometric shapes. In blade design, the drawn shape can meet the design requirements, thereby eliminating flow separation in the blade passage and increasing the blade's work capacity. The basis functions corresponding to multiple control points are obtained through the relational formula. It can draw NURBS curves to realize the drawing of pressure surfaces.

[0073] The blade design method for impeller assemblies according to the present invention can further refine the blade surface curve based on the defined approximate shape of the blade, so that the blade shape can still have a reasonable curve change under certain constraints. The blade shape can eliminate flow separation at the blade inlet, thereby reducing the overall flow loss of the impeller.

[0074] According to some embodiments of the present invention, such as Figure 9 As shown, the angle between the first tangent at the front edge of the pressure field and the second tangent at the intersection of the substrate and the front edge of the pressure field is β1-1; the angle between the third tangent at the front edge of the pressure field and the fourth tangent at the intersection of the substrate and the front edge of the pressure field is β2-1; the angle between the fifth tangent at the front edge of the suction field and the sixth tangent at the intersection of the substrate and the front edge of the suction field is β1-2; and the angle between the seventh tangent at the front edge of the suction field and the eighth tangent at the intersection of the substrate and the front edge of the suction field is β2-2.

[0075] S1, according to "Determining basis functions" includes:

[0076] S01. Determine the basis functions, node positions, control point positions, and control point weights based on β1-1, β2-1, β1-2, and β2-2.

[0077] Here, the blade shape consists of a pressure surface and a suction surface, which are constructed as two NURBS curves. Based on the blade inlet installation angle β1 (β1-1 for the pressure surface and β1-2 for the suction surface) and the outlet installation angle β2 (β2-1 for the pressure surface and β2-2 for the suction surface), the blade shape can be initially designed to define the approximate shape of the blade, thereby determining the basis function, node position, control point position, and control point weight. The blade surface curve is further refined by using a third-order six-control-point NURBS curve. This allows the blade shape to still have reasonable curve variations under constraints such as a larger outlet installation angle β2, a smaller inlet installation angle β1, a certain chord length, and the blade center angle OCC. Furthermore, with a large number of control points, local fine-tuning of the blade shape can be achieved, making local curvature abrupt changes smaller than overall curvature abrupt changes, resulting in smoother flow and less drag between blades in the blade passage. Meanwhile, each control point is assigned a weight value, allowing the curve or surface to adapt more flexibly to various geometric shapes. During blade design, the drawn shape can meet design requirements, thereby eliminating flow separation within the blade passage and increasing the blade's work capacity. The basis functions corresponding to multiple control points are linked by the following formula: It can draw NURBS curves to realize the drawing of pressure surfaces.

[0078] According to some embodiments of the present invention, such as Figure 9 As shown,

[0079] S1, according to "Determining basis functions" also includes:

[0080] S02. Determine the thickness distribution curve of the overall leaf shape based on the leading edge thickness of the blade, the trailing edge thickness of the blade, and the maximum thickness of the blade, so as to design the shape of the blade.

[0081] Here, the blade leading edge thickness σ1, the blade maximum thickness σm, and the blade trailing edge thickness σ2 together constrain the general thickness distribution of the blade. The approximate blade shape can be defined by the inlet installation angle β1, the outlet installation angle β2, the impeller outer diameter D2, the impeller inner diameter D1, the blade center angle OCC, the blade leading edge thickness σ1, the blade maximum thickness σm, and the blade trailing edge thickness σ2. Under the constraint of satisfying the approximate shape of the blade, the blade surface curve can be further refined so that the blade shape still has a reasonable curve variation.

[0082] The following is a brief description of the fan assembly 100 according to the present invention.

[0083] like Figure 10 As shown, the fan assembly 100 according to the present invention includes the impeller assembly 1 of any one of the above embodiments. Since the fan assembly 100 according to the present invention is provided with the impeller assembly 1 of the above embodiments, the fan assembly 100 has higher working efficiency.

[0084] The air conditioner according to the present invention is briefly described below.

[0085] The air conditioner according to the present invention includes the impeller assembly 1 or the fan assembly 100 as described in any of the above embodiments. Since the air conditioner according to the present invention is provided with the impeller assembly 1 or the fan assembly 100 of the above embodiments, the user experience of the air conditioner is better.

[0086] In summary, the impeller assembly 1 designed according to the present invention has a blade 20 with a blade shape constructed using a third-order six-control-point NURBS curve. This allows for further refinement of the surface curve of the blade 20 while satisfying the constraints of the general shape of the blade 20, ensuring that the blade 20 still has a reasonable curve variation, making the flow between blades 20 smoother and reducing resistance.

[0087] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0088] Although embodiments of the present invention have been shown and described above, variations, modifications, substitutions and alterations can be made to the above embodiments.

Claims

1. An impeller assembly (1), characterized in that, include: The substrate (10) is constructed in a ring shape; Blade (20), the blade (20) is disposed on the substrate (10) and is configured to be a plurality of blades spaced apart on the outer periphery of the substrate (10), the two sides of the blade (20) in the thickness direction are pressure surface (21) and suction surface (22), respectively. Each blade (20) is provided with a plurality of control points (P) spaced apart from each other in the radial direction, and the coordinates of each control point (P) relative to the blade (20) are originally P. i =(x i ,y i ); The node vector of any point on the pressure surface (21) and / or the suction surface (22) is t and satisfies: in The surface curves of the pressure surface (21) and / or the suction surface (22) satisfy: The w i This is the weighting factor.

2. The impeller assembly (1) according to claim 1, characterized in that, The substrate (10) has an inner diameter of D1 and an outer diameter of D2. The blade (20) has a leading edge thickness of σ1 and a trailing edge thickness of σ2. The blade (20) has a maximum thickness of σm, and satisfies the following conditions: σ1, σ2 ∈ [0.008D2, 0.01D2], σ m ∈[0.015D2,0.018D2].

3. The impeller assembly (1) according to claim 2, characterized in that, The angle between the first tangent (a) at the leading edge of the pressure surface (21) and the second tangent (b) at the intersection of the substrate (10) and the leading edge of the pressure surface (21) is β1-1, and satisfies: 70°≤β1-1≤90°; The angle between the third tangent (c) at the tail edge of the pressure surface (21) and the fourth tangent (d) at the intersection of the substrate (10) and the tail edge of the pressure surface (21) is β2-1, and satisfies: 140°≤β2-1≤170°; The angle between the fifth tangent (e) at the leading edge of the suction surface (22) and the sixth tangent (f) at the intersection of the substrate (10) and the leading edge of the suction surface (22) is β1-2, and satisfies: 70°≤β1-2≤90°; The angle between the seventh tangent (g) at the trailing edge of the suction surface (22) and the eighth tangent (h) at the intersection of the substrate (10) and the trailing edge of the suction surface (22) is β2-2, and satisfies: 140°≤β2-2≤170°.

4. The impeller assembly (1) according to claim 1, characterized in that, The leading edge of the blade (20) protrudes radially inward from the substrate (10).

5. The impeller assembly (1) according to claim 4, characterized in that, The pressure surface (21) and the suction surface (22) located at the leading edge of the blade (20) are connected by a transition surface (23), which is constructed as an elliptical surface that is tangent to the pressure surface (21) and the suction surface (22) respectively.

6. A blade design method for an impeller assembly, said impeller assembly being configured as claimed in any one of claims 1-5, characterized in that, The blade design method includes: S1, according to Determine the basis functions; S2, according to Plot the surface curves of the blade pressure surface and / or the suction surface.

7. The blade design method for an impeller assembly according to claim 6, characterized in that, The angle between the first tangent at the front edge of the pressure plate and the second tangent at the intersection of the substrate and the front edge of the pressure plate is β1-1; The angle between the third tangent at the tail edge of the pressure surface and the fourth tangent at the intersection of the substrate and the tail edge of the pressure surface is β2-1; The angle between the fifth tangent at the front edge of the suction force and the sixth tangent at the intersection of the substrate and the front edge of the suction force is β1-2; The angle between the seventh tangent at the trailing edge of the suction surface and the eighth tangent at the intersection of the substrate and the trailing edge of the suction surface is β2-2; The S1, according to "Determining basis functions" includes: S01. Determine the basis functions, node positions, control point positions, and control point weights based on β1-1, β2-1, β1-2, and β2-2.

8. The blade design method for an impeller assembly according to claim 7, characterized in that, The S1, according to "Determining basis functions" also includes: S02. Determine the thickness distribution curve of the overall leaf shape based on the leading edge thickness of the blade, the trailing edge thickness of the blade, and the maximum thickness of the blade, so as to design the shape of the blade.

9. A fan assembly, characterized in that, Includes the impeller assembly according to any one of claims 1-5.

10. An air conditioner, characterized in that, It includes the impeller assembly according to any one of claims 1-5 or the fan assembly according to claim 9.

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