High-strength cross-flow fan blade for air conditioner and middle wind wheel of cross-flow fan blade
By setting up air-inlet and leeward side protrusions at the root of the cross-flow wind turbine blades, optimizing stress distribution and injection molding process, the problems of insufficient structural strength and injection molding defects in traditional wind turbines are solved, achieving a wind turbine design with high strength and high reliability.
Patent Information
- Application Number
- CN202520599214.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-31
AI Technical Summary
Traditional cross-flow wind turbine blades have weak root structure strength and severe stress concentration, leading to fatigue cracks, plastic deformation, and injection molding defects, which affect the performance and lifespan of the wind turbine.
By setting up protrusions on the air inlet and leeward sides at the blade root to form a right-angled triangular cross section, combined with the docking groove and radial protrusion design of the annular disc, the stress distribution and injection molding process are optimized to enhance the blade root structure.
It significantly improves the overall strength and reliability of the wind turbine, extends its service life, improves the injection molding process, reduces welding deformation and weld line defects, and enhances the quality of the wind turbine blades.
Smart Images
Figure CN223881418U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to air conditioning air supply component technical field especially, relates to a kind of high-strength air-conditioning through-flow fan blade and the wind wheel thereof. BACKGROUND
[0002] Through-flow fan blade as the core air supply component of air-conditioning indoor unit, its wind wheel structure reliability directly influences the service life of whole machine.Conventional wind wheel adopts the integrated design of blade root and hub disc ultrasonic welding, wherein blade root usually adopts right angle or small-radian fillet transition structure.However, this design has multiple outstanding problems in practical application, seriously affects the performance and life of fan blade.
[0003] Firstly, the root structure is weak in strength.The right angle or small-radian fillet transition leads to significant stress concentration phenomenon, and fatigue cracks are easily caused under alternating load.In ultrasonic welding process, the material in stress concentration area is locally overheated, causing the microstructure of welding interface to deteriorate, and seriously weakening the connection strength.After long-term operation, plastic deformation accumulates in the root area, leading to the attenuation of wind wheel dynamic balance performance, and affecting the overall operation efficiency and noise control of air conditioner.Secondly, the injection molding process has obvious defects.The right angle transition structure of blade root causes the sudden change of melt flow path, and stagnation effect is easily formed during injection molding.This not only greatly increases the injection pressure, aggravates the mold loss, but also produces forming defects such as weld marks in the root area, further reducing the mechanical properties of the area.These defects not only affect the appearance quality of the product, but also cause structural problems in the long-term use of fan blade, shortening its service life.
[0004] In view of the above problems, the prior art needs to be improved. SUMMARY
[0005] To solve the above problems, the purpose of the utility model is to provide a kind of high-strength air-conditioning through-flow fan blade and the wind wheel thereof, with the advantages of improving structural strength, improving injection molding process and optimizing stress distribution.
[0006] To achieve the above purpose, the utility model adopts the following technical solutions:
[0007] The present application provides a kind of wind wheel, technical solutions are as follows: including annular disc and the multiple blades of the circumferential arrangement of the link in the front side edge of disc, the rear side edge of the disc is equipped with a circle and the top end shape of adjacent wind wheel blade is adapted to the butt joint groove;The root of the blade is provided with blade root reinforcing platform, and the blade root reinforcing platform includes the air inlet side boss on the air inlet side of blade root and the leeward side boss on the leeward side.
[0008] Further, the present application also proposes that the height of the air inlet side boss and the leeward side boss is greater than 1.3mm, and the root offset angle of the boss is greater than 25 °.
[0009] Further, the application also proposes that the cross-sectional shape of the windward side boss and the leeward side boss is a right triangle, and the right angle side respectively matches the blade root and the disc surface.
[0010] Further, the application also proposes that the outer contour of the butt joint groove completely matches the shape of the adjacent wind wheel blade tip, and the groove wall is a bevel consistent with the inclination angle of the blade tip.
[0011] Further, the application also proposes that the inner edge of the annular disc is provided with a plurality of radially inwardly recessed bosses, and the bosses are distributed at equal intervals along the inner edge of the disc.
[0012] Further, the application also proposes that the height of the windward side boss and the leeward side boss is 1.5mm to 2.5mm, and the root deviation angle is 28° to 35°.
[0013] Further, the application also proposes a high-strength air-conditioning cross-flow fan blade, comprising at least two above-mentioned middle wind wheels; when the adjacent middle wind wheels are butt jointed, the blade of one middle wind wheel is fixedly connected with the butt joint groove of another middle wind wheel through ultrasonic welding.
[0014] As can be seen from the above, the high-strength air-conditioning cross-flow fan blade and the middle wind wheel provided by the application comprise an annular disc and a plurality of blades arranged circumferentially on the front side edge of the disc, the rear side edge of the disc is provided with a circle of butt joint grooves matched with the shape of the top end of the adjacent wind wheel blade; the root of the blade is provided with a blade root reinforcing platform, and the blade root reinforcing platform comprises a windward side boss on the windward side of the blade root and a leeward side boss on the leeward side. By arranging the blade root reinforcing platform, the structural strength of the blade root is enhanced, the stress distribution is optimized, and the injection molding process is improved, which has the advantages of improving the structural strength, improving the injection molding process, and optimizing the stress distribution. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 The end view of the middle wind wheel provided by the application is shown.
[0016] Figure 2 The A-A sectional view of the middle wind wheel provided by the application is shown. Figure 1
[0017] Figure 3 The root view of the blade provided by the application is shown. DETAILED DESCRIPTION
[0018] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.
[0019] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0020] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more, unless otherwise explicitly limited.
[0021] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0022] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature with respect to the second feature can include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature with respect to the second feature include the vertical direction of the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature with respect to the second feature include the vertical direction of the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0023] Example 1:
[0024] As Figures 1 to 3 shown, the present embodiment relates to a wind wheel, comprising a ring-shaped wheel disc 1 and a plurality of blades 2 arranged circumferentially along the front edge of the wheel disc, and a set of butt joints 3 on the rear edge of the wheel disc, which are adapted to the shape of the top end of the adjacent wind wheel blades 2. The root of the blade 2 is provided with a blade root reinforcing platform 7, which includes an inboard convex platform 4 on the inboard side of the blade 2 and an outboard convex platform 5 on the outboard side. This technical solution forms a gradual stress transition zone at the root of the blade 2 by setting the blade root reinforcing platform 7 structure with specific geometric parameters, effectively reducing the stress concentration coefficient. The double convex platform structure forms a shunt channel, improving the melt flow state during injection molding. The butt joint 3 design realizes mechanical interlocking between wind wheels, improving the overall structural stability. Compared with traditional design, this structure can better disperse stress and reduce the possibility of welding deformation, thereby improving the overall strength and reliability of the wind wheel. This design is simple and reasonable, easy to manufacture, and particularly suitable for air conditioner cross-flow fan blades that require high strength and high reliability, effectively improving the quality and service life of the product.
[0025] In specific embodiments, the height B of the inboard convex platform 4 and the outboard convex platform 5 is greater than 1.3 mm, and the root offset angle θ of the convex platform is greater than 25°. This technical solution realizes synergistic effect through double structural parameter limitation: the increase of convex platform height directly increases the root cross-sectional area, making the wall thickness increase from 0.8-1.0 mm in traditional design to more than 1.5 mm, increasing the material volume by more than 50%, significantly improving the bending cross-sectional modulus. The increase of root offset angle changes the stress transmission direction, making the maximum principal stress direction generated by alternating load change from perpendicular to the welding interface in traditional design to 55-65° angle with the interface, and the stress concentration coefficient can be reduced by 30-40%.
[0026] As Figure 3As shown in the drawings, the cross-sectional shape of the windward side boss 4 and the leeward side boss 5 is a right-angled triangle, and the right angle side is respectively attached to the blade 2 root and the disc surface. The right-angled triangle cross-section design has the following implementation: the hypotenuse of the right-angled triangle can be a straight line or a slightly convex arc line, wherein the curvature radius of the slightly convex arc line is not less than 3mm; the length ratio of the right angle side is controlled within the range of 1:1 to 1:1.5; the intersection of the two right angle sides can be provided with a 0.1-0.3mm process fillet. Thus, the technical scheme realizes triple mechanical improvement through geometric configuration optimization: the right angle side completely attaches to establish a continuous load transmission path, eliminating the stress mutation point caused by the traditional right angle transition; the triangular cross-section forms a gradual stiffness gradient, making the root stress peak value reduce by more than 40%; the increased geometric attachment surface makes the welding contact area increase by 25%-30%, and the ultrasonic welding energy absorption is more uniform. In the injection molding process, the right-angled triangular cross-section meets the uniform wall thickness requirement, and the melt flow front speed difference is controlled within 15%, effectively avoiding the weld line defects. Compared with the prior art, the fatigue life is increased by 2-3 times under the same material consumption, and the mold processing difficulty is not significantly increased.
[0027] Further, the present application also proposes that the outer contour of the butt joint groove 3 completely matches the shape of the adjacent wind wheel blade 2 top end, and the groove wall is a bevel with the same inclination angle as the top end of the blade 2. The technical scheme forms a continuous surface contact conduction path during ultrasonic welding through geometric matching and bevel cooperative design. Specifically, the complete matching of the outer contour makes the welding contact area reach the theoretical maximum, which is about 300% higher than the traditional line contact method; the consistent bevel angle of the groove wall ensures uniform distribution of welding pressure.
[0028] In addition Figure 1 As shown, a plurality of radially inwardly protruding bosses 6 are arranged on the inner edge of the annular disc 1, and the bosses 6 are distributed equidistantly along the inner edge of the disc. Specifically, the radial protruding structure of the boss 6 can be implemented in the following way: the cross-sectional shape of the boss 6 is trapezoidal, rectangular or semicircular, wherein the trapezoidal cross-section is beneficial to injection molding demolding while ensuring structural strength. Thus, the technical scheme realizes double effects through the radial protruding structure of the boss 6: on the one hand, the boss 6 acts as a local strengthening structure, significantly improves the connection stability by increasing the contact area and mechanical engagement of the inner edge of the disc with the driving shaft; on the other hand, in the injection molding process, the boss 6 can act as a melt flow guide structure, making the plastic melt uniformly fill from the center of the disc to the edge, avoiding the weld line defects caused by flow channel mutation in the traditional structure. Compared with the prior art, the design simultaneously optimizes the structural strength and molding process in a limited space, solving the problems of vibration noise and life attenuation caused by unstable connection of the traditional wind wheel.
[0029] Further, the application also proposes that the height B of the windward side boss 4 and the leeward side boss 5 is 1.5mm to 2.5mm, and the root offset angle is 28° to 35°. Specifically, the height range of the windward side boss 4 and the leeward side boss 5 is determined by experimental verification. When the height is lower than 1.5mm, the structural strength is insufficient and plastic deformation is easy to occur under alternating load; when the height exceeds 2.5mm, the melt flow resistance increases during injection molding, and shrinkage defects are easy to occur. The root offset angle is in the range of 28° to 35°. This angle interval is verified by fluid mechanics simulation to form a gradual stress transfer path. When the angle is less than 28°, the stress concentration coefficient is still high, and when the angle is greater than 35°, the melt filling is difficult. As a preferred embodiment, the boss height can be set to 1.8mm, 2.0mm or 2.2mm, etc. The offset angle can be selected as 30° or 32°, etc. In addition, the boss cross-sectional shape can adopt a right triangle or a trapezoid, in which the right angle of the right triangle is respectively attached to the root of the blade 2 and the surface of the disc, which is more conducive to stress transfer. Thus, the technical scheme realizes the balance between mechanical properties and process performance in a limited space by precisely controlling the boss geometric parameters. The height parameter ensures sufficient bearing cross section, avoids strength degradation due to insufficient wall thickness, and limits the maximum height to prevent injection molding defects. Compared with the prior art, the scheme solves the problem of serious stress concentration of the traditional right-angle transition structure under the same space constraint, overcomes the molding difficulty caused by simply increasing the wall thickness, and realizes the coordinated improvement of fatigue resistance and manufacturability.
[0030] Embodiment 2:
[0031] This embodiment relates to a high-strength air-conditioning through-flow fan blade, which comprises at least two middle wind wheels. The middle wind wheel adopts the middle wind wheel described in embodiment 1. When the adjacent middle wind wheels are connected, the blade 2 of one middle wind wheel is fixedly connected with the butt joint groove 3 of another middle wind wheel through ultrasonic welding. The technical scheme divides the whole fan blade into multiple standard units through modular combination design, in which the blade 2 and the butt joint groove 3 of adjacent units form a nested connection structure. In the ultrasonic welding process, the windward side boss 4 and the leeward side boss 5 of the blade root reinforcing platform 7 jointly constitute a welding stress buffer zone. The right triangle boss structure not only improves the melt flow path and reduces the risk of injection molding defects, but also effectively disperses stress through increasing the contact area and specific angle design. The precise matching design of the butt joint groove 3 ensures the connection reliability when multiple wind wheels are assembled, and the ultrasonic welding process cooperates with the optimized root structure to avoid the deterioration of the microstructure of the welding interface. Thus, the technical problems of weak structural strength of the root of the traditional fan blade 2, poor injection molding process and contradiction between strength and process are solved. Compared with the prior art, the scheme significantly improves the strength of the welding interface and the quality of injection molding while maintaining the compactness of the structure.
[0032] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0033] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model. The ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model without departing from the principles and purposes of the utility model.
Claims
1. A wind wheel comprising a ring-shaped wheel disc (1) and a plurality of blades (2) arranged circumferentially along the front edge of the wheel disc, characterized in that: - the rear edge of the wheel disc (1) is provided with a ring of abutment grooves (3) matching the shape of the top end of the adjacent wind wheel blades; - the root of the blade (2) is provided with a blade root reinforcing platform (7) comprising an inlet side boss (4) on the inlet side of the blade root and a leeward side boss (5) on the leeward side.
2. The wind wheel according to claim 1, characterized in that: - the height (B) of the inlet side boss (4) and the leeward side boss (5) is greater than 1.3 mm, and the root offset angle (θ) of the boss is greater than 25°.
3. The wind wheel according to claim 2, characterized in that: - the cross-sectional shape of the inlet side boss (4) and the leeward side boss (5) is a right-angled triangle, and the right-angled side is respectively in contact with the blade root and the wheel disc surface.
4. The wind wheel according to claim 1, characterized in that: - the outer contour of the abutment groove (3) completely matches the shape of the top end of the adjacent wind wheel blade, and the groove wall is a slope with the same inclination angle as the top end of the blade.
5. The wind wheel according to claim 1, characterized in that: - a plurality of radially inwardly recessed bosses (6) are arranged on the inner edge of the ring-shaped wheel disc (1), and the bosses (6) are distributed equidistantly along the inner edge of the wheel disc.
6. The wind wheel according to claim 2 or 3, characterized in that: - the height (B) of the inlet side boss (4) and the leeward side boss (5) is 1.5 mm to 2.5 mm, and the root offset angle (θ) is 28° to 35°.
7. A high-strength air-conditioning cross-flow fan blade, characterized in that: - it comprises at least two wind wheels according to any one of claims 1-6; - when the adjacent wind wheels are abutted, the blade (2) of one wind wheel is fixedly connected with the abutment groove (3) of the other wind wheel through ultrasonic welding.