Blade with outer edge winglet

Abstract

The utility model discloses a blade with an outer edge winglet, the blade is provided with an inner side close to a blade handle and an outer side far away from the blade handle, the outer side of the blade is provided with the winglet extending along the outer edge of the blade, and the winglet is of a sheet structure; wherein one side face of the small wing is connected with the outer edge, the small wing is divided into a small wing lower portion and a small wing upper portion relative to the outer edge of the blade, the height of the small wing lower portion from the front end to the rear end of the small wing lower portion is gradually increased and then gradually decreased, and the height of the small wing upper portion from the front end to the rear end of the small wing upper portion is gradually increased and then gradually decreased. According to the technical scheme, the sheet-shaped winglets are arranged on the outer edges, leakage of gaps at the tops of the blades is restrained, more airflow acts through the blades, energy loss is reduced, and therefore the overall efficiency of the fan is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fan blades, in particular to a blade with a skeleton structure and outer edge winglets. Background Art

[0002] Traditional fan blades are mostly made of steel or aluminum alloy, usually with simple geometric shapes and cross-sectional shapes, such as flat, curved, twisted, etc. This simple design is easy to manufacture and install, and uses common manufacturing processes such as casting, forging, and stamping. The blades produced have a simple structure and are relatively easy to maintain and replace parts.

[0003] However, due to design and material limitations, traditional fan blades can suffer from poor aerodynamic performance, heavy weight, low efficiency, and high noise levels. These issues can affect the overall performance and application scope of the fan, leading to increased operating costs and failing to meet energy conservation and emission reduction requirements. Utility Model Content

[0004] The main purpose of the utility model is to provide a blade with an outer edge winglet, aiming to solve the technical problems of poor aerodynamic performance and low efficiency of traditional fan blades.

[0005] To achieve the above-mentioned purpose, the utility model proposes a blade with an outer edge winglet, which has an inner side close to the petiole and an outer side away from the petiole. The outer side of the blade is provided with a winglet extending along the outer edge thereof, and the winglet is a sheet-like structure;

[0006] Among them, one side of the winglet is connected to the outer edge, and the winglet is divided into a lower winglet part and an upper winglet part relative to the outer edge of the blade. The height of the lower winglet from its front end to its rear end first gradually increases and then gradually decreases, and the height of the upper winglet from its front end to its rear end first gradually increases and then gradually decreases.

[0007] Optionally, the lower portion of the winglet reaches its highest point h at the position of its length l1 1max , wherein the total length of the winglet is L, 1 / 3L≦l1≦2 / 3L.

[0008] Optionally, the upper portion of the winglet reaches its highest point h at the position of its length l2 2max , wherein the total length of the winglet is L, 2 / 3L≦l2≦1L.

[0009] Optionally, the winglet reaches its highest H at the position of its length l3 max ; Wherein, the total length of the winglet is L, 2 / 3L≦l3≦1L.

[0010] Optionally, the total length of the winglet is greater than the length of the outer edge.

[0011] Optionally, when the blade is mounted on the impeller, the blade cross-sectional parameters at the radius ∅930 with the impeller rotation axis as the center are: Cmax is 4.1mm, e is 35.5mm, b is 180.7mm, B 1A 2 degrees, B 2A is 37 degrees, ζi is 25 degrees;

[0012] Where Cmax: C is the airfoil thickness, the distance between the normal line of the airfoil centerline and the intersection of the airfoil contour line, that is, the diameter of the airfoil inscribed circle, and the maximum value of the airfoil thickness is called the maximum airfoil thickness Cmax;

[0013] e: Maximum thickness position, the distance from the leading edge of the airfoil to the maximum thickness of the airfoil along the chord direction;

[0014] b: chord length, the length of the chord of the wing;

[0015] B 1A : The airfoil inlet geometric angle is the angle between the tangent line through the leading edge of the airfoil to the airfoil centerline and the forehead line;

[0016] B 2A : The airfoil inlet geometric angle is the angle between the tangent line through the airfoil trailing edge point to the airfoil midline and the rear forehead line;

[0017] ζi: airfoil installation angle, which is the angle between the chord and the cascade front line.

[0018] Optionally, when the blade is mounted on the impeller, the blade cross-sectional parameters at the radius ∅780 with the impeller rotation axis as the center are: Cmax is 3mm, e is 30.9mm, b is 147.2mm, B 1A 5 degrees, B 2A is 30 degrees and ζi is 22 degrees.

[0019] Optionally, the blade section parameters at radius ∅630 are: Cmax is 3.3 mm, e is 30.7 mm, b is 137.2 mm, B 1A 5 degrees, B 2A is 35 degrees and ζi is 25 degrees.

[0020] Optionally, the blade section parameters at radius ∅480 are: Cmax is 3.8 mm, e is 39.2 mm, b is 126.7 mm, B 1A 8 degrees, B 2A is 43 degrees and ζi is 33 degrees.

[0021] Optionally, the blade section parameters at radius ∅330 are: Cmax is 4.8 mm, e is 49.3 mm, b is 114.6 mm, B 1A is 16 degrees, B 2A is 51 degrees and ζi is 41 degrees.

[0022] In the technical solution of the utility model, by arranging a sheet-like winglet on the outer edge, leakage of the blade tip gap is suppressed, more airflow is allowed to pass through the blade to do work, energy loss is reduced, and the overall efficiency of the fan is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 A front view of an embodiment of a blade with an outer edge winglet provided by the utility model;

[0025] Figure 2 for Figure 1 A top view from another perspective;

[0026] Figure 3 for Figure 1 Schematic diagram of the segmentation of each radius;

[0027] Figure 4 It is a schematic diagram of the names of the intersection lines of the blade surfaces;

[0028] Figure 5 A diagram of the intersection of curved surfaces at a section ∅930 of an embodiment of a blade with an outer edge winglet provided by the present invention;

[0029] Figure 6 A diagram of the intersection of curved surfaces at a section ∅780 of an embodiment of a blade with an outer edge winglet provided by the present invention;

[0030] Figure 7 A diagram of the intersection of curved surfaces at a section ∅630 of an embodiment of a blade with an outer edge winglet provided by the present invention;

[0031] Figure 8 A diagram of the intersection of curved surfaces at a section ∅480 of an embodiment of a blade with an outer edge winglet provided by the present invention;

[0032] Figure 9 A diagram of the intersection lines of curved surfaces at a section ∅330 in an embodiment of a blade with an outer edge winglet provided by the present invention.

[0033] In the figure: leaf blade with outer edge winglet - 100, petiole - 1, outer edge - 2, winglet - 3, lower part of winglet - 31, upper part of winglet - 32, leaf surface - 4.

[0034] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] In order to better describe and illustrate the embodiments of the present application, reference may be made to one or more drawings, but the additional details or examples used to describe the drawings should not be considered as limiting the scope of the utility model invention of the present application, any of the currently described embodiments or preferred methods.

[0037] In the description of the present invention, it should be noted that the terms "length", "width", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate that the device referred to must have a specific orientation or operate in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0039] Existing large-diameter blades are mostly made of metal. This is primarily because the larger the blade diameter, the faster the linear velocity of the blade's outer diameter. The faster the linear velocity, the greater the centrifugal and shear forces on the blade's outer periphery, requiring higher blade strength. Furthermore, while plastic blades offer cost savings, they are not strong enough. The blades are constantly subjected to stress during rotation, which can lead to deformation and insufficient wind power over time.

[0040] In view of this, the present invention proposes a blade with an outer edge winglet. Figure 1-8 For an embodiment of a blade with an outer edge winglet provided by the present invention, please refer to Figure 1-8 The leaf 100 has an inner side close to its petiole 1 and an outer side away from the petiole 1. The outer side of the leaf 100 is provided with a winglet 3 extending along its outer edge 2. The winglet 3 is a sheet-like structure.

[0041] Among them, one side of the winglet 3 is connected to the outer edge 2, and the winglet 3 is divided into a winglet lower part 31 and a winglet upper part 32 relative to the outer edge 2 of the blade 100. The height of the winglet lower part 31 gradually increases and then gradually decreases from its front end to the rear end, and the height of the winglet upper part 32 gradually increases and then gradually decreases from its front end to the rear end.

[0042] In the technical solution of the present invention, by providing a sheet-like winglet 3 on the outer edge 2, leakage of the blade tip gap 100 is suppressed, so that more airflow passes through the blade 100 to do work, reducing energy loss and thus improving the overall efficiency of the fan.

[0043] Since the airflow leakage between the front and back sides of the blade 100 is different, in one embodiment of the present invention, the lower portion 31 of the winglet reaches its maximum h at the position of its length l1. 1max The upper portion 32 of the winglet reaches its highest point h at the position of its length l2 2max The winglet 3 reaches its highest point H at the position of its length l3 max The total length of the winglet 3 is L, 1 / 3L≦l1≦2 / 3L, 2 / 3L≦l2≦1L, 2 / 3L≦l3≦1L. This can effectively prevent tip clearance leakage.

[0044] Preferably, in order to better achieve the leakage prevention performance of the winglet 3 , in one embodiment of the present invention, the total length of the winglet 3 is greater than the length of the outer edge 2 .

[0045] It should be noted that the design of the winglet 3 on the outer edge 2 of the blade 100 has the following advantages.

[0046] Improving fan efficiency: Suppressing tip gap leakage is a key approach to improving fan efficiency. Tip gap leakage can cause some airflow to pass directly through the gap, bypassing the blades 100 for work, thereby reducing the fan's aerodynamic efficiency. Winglets 3 on the outer edge 2 effectively prevent this leakage, allowing more airflow to pass through the blades 100 for work, thereby improving the fan's overall efficiency.

[0047] Reduced energy loss: Leakage in the blade tip clearance not only reduces the fan's aerodynamic efficiency but also wastes energy. Adding winglets 3 on the outer edge 2 can reduce the amount of leaked air, thereby reducing energy loss and enabling the fan to output more air under the same conditions.

[0048] Noise reduction: Tip gap leakage is often accompanied by strong eddies and turbulence, which are one of the main sources of fan noise. By suppressing tip gap leakage, the formation of eddies and turbulence can be reduced, thereby reducing the operating noise of the fan and improving the noise environment around the fan.

[0049] Improving the durability of blade 100: The vortex and turbulence generated by tip clearance leakage can cause erosion and wear on the outer edge 2 of blade 100, reducing the service life of blade 100 over time. By adding winglets 3 on outer edge 2 to suppress leakage, the impact and wear of vortex and turbulence on blade 100 can be reduced, thereby improving the durability and reliability of blade 100.

[0050] Adaptability to diverse operating conditions: During operation, fans encounter a variety of complex operating conditions, such as fluctuating wind speed and direction. The design of the winglets 3 on the outer edge 2 effectively suppresses tip gap leakage under various operating conditions, maintaining efficient and stable fan operation. This design helps improve the fan's adaptability and reliability.

[0051] Optimizing aerodynamic performance: The shape of the winglets 3 on the outer edge 2 can further optimize the aerodynamic performance of the fan.

[0052] See also Figure 3-9 In one embodiment of the present invention, the curved surface of the blade 4 is biomimetic in design. When the blade 100 is installed on the impeller, the cross-sectional parameters of the blade 100 at the radius ∅930 with the impeller rotation axis as the center are: Cmax is 4.1mm, e is 35.5mm, b is 180.7mm, B 1A 2 degrees, B 2A is 37 degrees, ζi is 25 degrees; the cross-sectional parameters of blade 100 at radius ∅780 are: Cmax is 3mm, e is 30.9mm, b is 147.2mm, B 1A 5 degrees, B 2A is 30 degrees, ζi is 22 degrees; the cross-sectional parameters of blade 100 at radius ∅630 are: Cmax is 3.3mm, e is 30.7mm, b is 137.2mm, B 1A 5 degrees, B 2A is 35 degrees, ζi is 25 degrees; the cross-sectional parameters of blade 100 at radius ∅480 are: Cmax is 3.8mm, e is 39.2mm, b is 126.7mm, B 1A 8 degrees, B 2A is 43 degrees, ζi is 33 degrees; the cross-sectional parameters of blade 100 at radius ∅330 are: Cmax is 4.8mm, e is 49.3mm, b is 114.6mm, B 1A is 16 degrees, B 2A is 51 degrees, ζi is 41 degrees;

[0053] Where Cmax: C is the airfoil thickness, the distance between the normal line of the airfoil centerline and the intersection of the airfoil contour line, that is, the diameter of the airfoil inscribed circle, and the maximum value of the airfoil thickness is called the maximum airfoil thickness Cmax;

[0054] e: Maximum thickness position, the distance from the leading edge of the airfoil to the maximum thickness of the airfoil along the chord direction;

[0055] b: chord length, the length of the chord of the wing;

[0056] B 1A : The airfoil inlet geometric angle is the angle between the tangent line through the leading edge of the airfoil to the airfoil centerline and the forehead line (lower horizontal line);

[0057] B 2A : The airfoil inlet geometric angle is the angle between the tangent line through the airfoil trailing edge point to the airfoil midline and the rear forehead line (upper horizontal line);

[0058] ζi: airfoil installation angle, which is the angle between the chord and the cascade front line.

[0059] It should be noted that the role of bionic surface design is to imitate the biological structure design of birayfin fish in nature to achieve the following effects.

[0060] Improved aerodynamic performance: Bionic surface design mimics the curved shapes of organisms found in nature (such as bird wings and fish fins). These shapes have excellent fluid dynamics through long periods of natural selection and evolution. Applying these curved shapes to axial flow impellers optimizes the fluid dynamics of the blade 100, reducing resistance and energy consumption during fluid flow, thereby improving the impeller's aerodynamic efficiency and output power.

[0061] Noise Reduction: The bionic curved surface design can more effectively control the flow of fluid on the surface of the blade 100, reducing the occurrence of unstable flow phenomena such as eddy currents and turbulence. These unstable flow phenomena are one of the main causes of fluid machinery noise. Therefore, the bionic curved surface design helps to reduce the noise level of axial flow impellers, making them more environmentally friendly and energy-saving.

[0062] Enhanced structural stability: Bionic surface designs often have more reasonable stress and strength distribution, which helps enhance the structural stability and durability of axial flow impellers. Under high loads or harsh operating conditions, the bionic surface design can better withstand the impact and vibration of the fluid, thereby extending the service life of the impeller.

[0063] Optimizing flow and pressure distribution: The bionic curved surface design allows for fine-tuning of the curved shape of the blade 100 based on actual operating conditions to achieve more uniform flow and pressure distribution. This helps reduce turbulence and backflow within the impeller, improving flow efficiency and stability.

[0064] Broadening the scope of applications: Due to the advantages of bionic surface design in aerodynamic performance, noise control, and structural stability, axial flow impellers can be applied more widely in various fields. For example, in ventilation, air conditioning, and refrigeration, axial flow impellers with bionic surface design can provide more efficient, energy-saving, and environmentally friendly solutions.

[0065] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A leaf having an outer winglet, having an inner side near its petiole (1) and an outer side away from the petiole (1), characterized in that: The outer side of the blade is provided with a winglet (3) extending along the outer edge (2) thereof, and the winglet (3) is a sheet-like structure; One side of the winglet (3) is connected to the outer edge, and the winglet (3) is divided into a winglet lower part (31) and a winglet upper part (32) relative to the outer edge (2) of the blade. The height of the winglet lower part (31) gradually increases and then gradually decreases from the front end to the rear end, and the height of the winglet upper part (32) gradually increases and then gradually decreases from the front end to the rear end.

2. The blade with outer edge winglets according to claim 1, characterized in that: The lower part of the winglet (31) reaches its highest point h at the position where its length l1 1max , wherein the total length of the winglet (3) is L, 1 / 3L≦l1≦2 / 3L.

3. The blade with outer edge winglets according to claim 1, characterized in that: The upper portion of the winglet (32) reaches its highest point h at the position of its length l2 2max , wherein the total length of the winglet (3) is L, 2 / 3L≦l2≦1L.

4. The blade with outer edge winglets according to claim 1, characterized in that: The winglet (3) reaches its highest point H at the position where its length l3 max ; Wherein, the total length of the winglet (3) is L, 2 / 3L≦l3≦1L.

5. The blade with outer edge winglets according to claim 1, characterized in that: The total length of the winglet (3) is greater than the length of the outer edge (2).

6. The blade with outer edge winglets according to claim 1, characterized in that: When the blade is installed on the impeller, the blade cross-sectional parameters at the radius ∅930 with the impeller rotation axis as the center are: Cmax is 4.1mm, e is 35.5mm, b is 180.7mm, B 1A 2 degrees, B 2A is 37 degrees, ζi is 25 degrees; Where Cmax: C is the airfoil thickness, the distance between the normal line of the airfoil centerline and the intersection of the airfoil contour line, that is, the diameter of the airfoil inscribed circle, and the maximum value of the airfoil thickness is called the maximum airfoil thickness Cmax; e: Maximum thickness position, the distance from the leading edge of the airfoil to the maximum thickness of the airfoil along the chord direction; b: chord length, the length of the chord of the wing; B 1A : The airfoil inlet geometric angle is the angle between the tangent line through the leading edge of the airfoil to the airfoil centerline and the forehead line; B 2A : The airfoil inlet geometric angle is the angle between the tangent line through the airfoil trailing edge point to the airfoil midline and the rear forehead line; ζi: airfoil installation angle, which is the angle between the chord and the cascade front line.

7. The blade with outer edge winglets according to claim 6, characterized in that: When the blade is installed on the impeller, the blade cross-sectional parameters at the radius ∅780 with the impeller rotation axis as the center are: Cmax is 3mm, e is 30.9mm, b is 147.2mm, B 1A 5 degrees, B 2A is 30 degrees and ζi is 22 degrees.

8. The blade with outer edge winglets according to claim 6, characterized in that: The blade section parameters at radius ∅630 are: Cmax is 3.3mm, e is 30.7mm, b is 137.2mm, B 1A 5 degrees, B 2A is 35 degrees and ζi is 25 degrees.

9. The blade with outer edge winglets according to claim 6, characterized in that: The blade section parameters at radius ∅480 are: Cmax is 3.8mm, e is 39.2mm, b is 126.7mm, B 1A 8 degrees, B 2A is 43 degrees and ζi is 33 degrees.

10. The blade with outer edge winglets according to claim 6, characterized in that: The blade section parameters at radius ∅330 are: Cmax is 4.8mm, e is 49.3mm, b is 114.6mm, B 1A is 16 degrees, B 2A is 51 degrees and ζi is 41 degrees.

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