Blade based on bionic shark shield scale structure and impeller having the same

Abstract

The present invention discloses a blade based on a bionic shark shield scale structure and an impeller having the same. The blade based on the bionic shark shield scale structure includes a blade body and a plurality of drag reduction modules. The plurality of drag reduction modules are arranged on at least one side of the blade body. The plurality of drag reduction modules are arranged in sequence along the extension direction of the blade body, and each drag reduction module includes a plurality of drag reduction units. The outer surface of each drag reduction unit is formed with a plurality of protrusions, and a fluid groove is formed between two adjacent protrusions. The fluid groove penetrates the drag reduction unit along the extension direction of the blade body. According to the blade based on the bionic shark shield scale structure of an embodiment of the present invention, by providing a plurality of protrusions on the surface of the blade body, and forming a fluid groove extending along the extension direction of the blade body between two adjacent protrusions, the fluid on the blade surface can flow in the fluid groove along the extension direction of the fluid groove, which can improve the stability of the fluid flow, help improve the turbulent characteristics of the blade surface, and improve the overall performance of the impeller.

Description

Technical Field

[0001] This invention relates to the field of hydraulic machinery technology, and in particular to a blade based on a biomimetic shark shield structure and an impeller having the same structure. Background Technology

[0002] In recent years, with the deepening of human exploration of nature, biomimetic surface drag reduction technology has developed rapidly and been widely applied. Among these technologies, sharks, due to their speed and stealth in water, have become an important research subject in drag reduction biomimetic. The shark's rapid and agile swimming characteristics are closely related to the dermal denticles covering its body. The grooved structure on the surface of these denticles can improve the fluid structure and flow state of the turbulent boundary layer, thereby effectively reducing water resistance and achieving extremely high swimming speeds. In related technologies, when the blades in an impeller rotate and do work, the fluid velocity on the blade surface increases, increasing the uncertainty of the fluid flow direction. This leads to turbulence easily occurring in the flow channel, increasing fluid flow resistance and noise. Therefore, improving the turbulent characteristics of the blade surface has considerable research potential. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a blade based on a biomimetic shark scute structure, which can improve the turbulence characteristics of its surface and improve the overall performance of the impeller.

[0004] The present invention also proposes an impeller with blades based on a biomimetic shark shield structure.

[0005] According to a first aspect of the present invention, a blade based on a biomimetic shark shield structure is provided, the blade including a blade body and a plurality of drag reduction modules. The plurality of drag reduction modules are disposed on at least one side of the blade body and are arranged sequentially along the extension direction of the blade body. Each drag reduction module includes a plurality of drag reduction units. The outer surface of each drag reduction unit has a plurality of protrusions, and a fluid groove is formed between two adjacent protrusions. The fluid groove extends through the drag reduction unit along the extension direction of the blade body.

[0006] According to an embodiment of the present invention, the blade based on the biomimetic shark shield structure has multiple protrusions on the surface of the blade body, and a fluid groove extending along the extension direction of the blade body is formed between two adjacent protrusions. This allows the fluid on the blade surface to flow in the fluid groove along the extension direction of the fluid groove, which can improve the stability of the fluid flow, improve the turbulence characteristics of the blade surface, reduce the probability of turbulence in the flow channel, thereby reducing the flow resistance of the fluid, reducing the flow noise of the fluid, reducing the work loss of the blade, improving the working efficiency of the blade, and thus improving the overall performance of the impeller.

[0007] According to some embodiments of the present invention, the protrusion has a first side and a second side arranged opposite to each other, the first side and the second side of each protrusion intersect, and the first side of one of two adjacent protrusions intersects the second side of the other of two adjacent protrusions to form the fluid groove.

[0008] In some examples, both the first side and the second side are flat slopes.

[0009] In some examples, multiple planes are defined, each of the drag-reducing units is symmetrical about one of the planes, and the intersection line of the first side and the second side of one of the protrusions lies on the plane. The maximum height of the multiple protrusions gradually decreases in a direction away from the plane.

[0010] According to some embodiments of the present invention, each of the drag-reducing units includes a base and a plurality of protrusions, the plurality of protrusions being disposed on the base, the base having a height of h0; the plurality of protrusions includes a first protrusion, two second protrusions, and two third protrusions, the first protrusion having a height of h3, the two second protrusions being symmetrically arranged with a height of h2, the two third protrusions being symmetrically arranged with a height of h1, the second protrusions being located between the first protrusions and the third protrusions, and the minimum height of the fluid channel between the second protrusions and the third protrusions being c, wherein h n = c + nh0 (n = 1, 2, 3).

[0011] In some examples, the height of the substrate is h0, where 0 ≤ h0 ≤ 100 μm.

[0012] According to some embodiments of the present invention, the length of the drag-reducing unit along the extending direction of the blade body is b, where 400μm≤b≤800μm.

[0013] According to some embodiments of the present invention, the width of the drag reduction unit is a, where 400μm≤a≤800μm.

[0014] In some examples, the protrusions of the drag-reducing units of two adjacent drag-reducing modules are staggered along the extension direction of the blade body.

[0015] An impeller with blades based on a biomimetic shark scute structure according to a second aspect of the present invention includes blades based on a biomimetic shark scute structure according to a first aspect of the present invention. By employing the aforementioned blades, the fluid on the blade surface can flow in the fluid channel along the extension direction of the fluid channel, which can improve the stability of the fluid flow, improve the turbulence characteristics of the blade surface, reduce the probability of turbulence in the flow channel, thereby reducing the flow resistance of the fluid, reducing the flow noise of the fluid, improving the working efficiency of the impeller, and thus improving the overall performance of the impeller.

[0016] 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

[0017] 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:

[0018] Figure 1 This is a partial structural schematic diagram of an impeller according to some embodiments of the present invention;

[0019] Figure 2 This is a schematic diagram of the drag reduction module according to some embodiments of the present invention;

[0020] Figure 3 This is a schematic diagram of the drag reduction unit according to some embodiments of the present invention;

[0021] Figure 4 This is a schematic diagram of the drag reduction unit according to some embodiments of the present invention from one viewpoint;

[0022] Figure 5 This is a schematic diagram of the drag reduction unit according to some embodiments of the present invention from another perspective.

[0023] Figure label:

[0024] Blade 100, Impeller 200

[0025] Blade body 10,

[0026] Drag reduction module 20, drag reduction unit 21, first protrusion 211, second protrusion 212, third protrusion 213, base 214.

[0027] Fluid tank 30, first side 31, second side 32. Detailed Implementation

[0028] 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.

[0029] 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," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] The following is for reference. Figures 1-5 A blade 100 based on a biomimetic shark shield structure is described according to an embodiment of the present invention.

[0032] like Figures 1-5 As shown, according to an embodiment of the present invention, a blade 100 based on a biomimetic shark scute structure includes a blade body 10 and a plurality of drag-reducing modules 20. The plurality of drag-reducing modules 20 can be disposed on at least one side of the blade body 10, that is, the plurality of drag-reducing modules 20 are disposed on the surface of the blade body 10, so as to... Figure 1 The extension direction of the blade body 10 shown is Figure 2 Taking the vertical direction as an example, multiple drag reduction modules 20 can be arranged on one side of the blade body 10 (e.g., ...). Figure 2 The front side (as shown) can reduce the flow resistance of the fluid located on the front side of the blade body 10. Multiple drag-reducing modules 20 can be respectively arranged on opposite sides of the blade body 10 (e.g., the front side). Figure 2The front and rear sides shown can increase the contact area between the drag reduction module 20 and the fluid, thereby improving the drag reduction effect on the fluid.

[0033] Multiple drag reduction modules 20 extend along the extension direction of the blade body 10 (e.g., Figure 2 The components are arranged sequentially in the vertical direction shown, and each drag reduction module 20 includes multiple drag reduction units 21. Multiple protrusions are formed on the outer surface of each drag reduction unit 21, and a fluid groove 30 is formed between two adjacent protrusions. The fluid groove 30 extends along the extension direction of the blade body 10 (e.g., vertical direction). Figure 3 (As shown in the vertical direction) it penetrates through the drag reduction unit 21.

[0034] This allows the fluid on the surface of the blade 100 to flow within the fluid channel 30, thus limiting the flow direction of the fluid on the surface of the blade 100. This improves the stability of the fluid flow, and the flow direction of the fluid is consistent with the extension direction of the fluid channel 30. This further improves the turbulence characteristics of the blade 100 surface, reduces the probability of turbulence in the flow channel, thereby reducing the flow resistance of the fluid and improving the working efficiency of the blade 100.

[0035] According to an embodiment of the present invention, the blade 100 based on a biomimetic shark shield structure has multiple protrusions on the surface of the blade body 10, and a fluid groove 30 extending along the extension direction of the blade body 10 is formed between two adjacent protrusions. This allows the fluid on the surface of the blade 100 to flow in the fluid groove 30 along the extension direction of the fluid groove 30, which can improve the stability of the fluid flow, improve the turbulence characteristics of the blade 100 surface, reduce the probability of turbulence in the flow channel, thereby reducing the flow resistance of the fluid, reducing the flow noise of the fluid, reducing the power loss of the blade 100, improving the working efficiency of the blade 100, and thus improving the overall performance of the impeller 200.

[0036] like Figures 3-5 As shown, according to some embodiments of the present invention, the protrusion has a first side surface 31 and a second side surface 32 arranged opposite to each other, and the first side surface 31 and the second side surface 32 of each protrusion intersect, that is, in the direction away from the blade body 10 of the drag reduction unit 21 (e.g., Figure 3 In the direction shown from back to front, the first side 31 and the second side 32 of each protrusion are close to each other, which can increase the opening size of the fluid channel 30 so that the fluid on the surface of the blade 100 can flow through the fluid channel 30.

[0037] In two adjacent protrusions, the first sidewall 31 of one protrusion intersects with the second sidewall of the other protrusion to form a fluid groove 30 in the two adjacent protrusions, that is, in the direction of the drag reduction unit 21 near the blade body 10 (e.g. Figure 3 In the direction shown from front to back), the fluid channel 30 is in the width direction (e.g., Figure 3The dimensions in the left-right direction gradually decrease, making the flow of fluid at the bottom junction of the fluid tank 30 more stable and improving the turbulence effect of the fluid flow.

[0038] like Figures 3-5 As shown, in some examples, the first side surface 31 and the second side surface 32 can be flat inclined surfaces, such that each protrusion faces away from the blade body 10 (e.g., Figure 3 The direction shown (from back to front) extends to form a sharp angle, which can improve the guiding effect on fluid flow and make the bottom of the fluid channel 30 extend towards the blade body 10 (e.g., Figure 3 The direction shown (from front to back) extends to form a sharp angle, which can improve the turbulence characteristics of the blade 100 surface and facilitate processing.

[0039] Of course, the first side surface 31 and the second side surface 32 can also be curved surfaces, with the curved surfaces facing the direction closer to the blade body 10 (e.g., Figure 3 The bending (as shown in the front-to-back direction) can reduce the impact intensity of the fluid on the surface of the blade 100, reduce the load on the surface of the blade 100 when the blade 100 is doing work, and help to improve the service life of the blade 100.

[0040] like Figure 4 As shown, in some examples, multiple planes are defined, each drag-reducing unit 21 is symmetrical about one plane, and the intersection line of the first side 31 and the second side 32 of a protrusion within each drag-reducing unit 21 lies on the plane, along a direction away from the plane, i.e. Figure 4 O is the origin, along the positive direction of the X-axis (e.g., ...). Figure 4 (as shown in the left-to-right direction) or in the negative direction of the X-axis (such as...) Figure 4 As shown in the direction from right to left, the maximum height of the multiple protrusions gradually decreases, and the height of the bottom of the multiple fluid channels 30 gradually decreases.

[0041] Furthermore, when the blade 100 rotates and does work, the multiple protrusions of different heights can guide the fluid on the surface of the blade 100, so that the fluid can flow evenly in the multiple fluid channels 30, which can improve the drag reduction effect of the fluid, improve the working efficiency of the blade 100, and help reduce the working noise of the blade.

[0042] like Figure 4 As shown, according to some embodiments of the present invention, each drag reduction unit 21 includes a base 214 and a plurality of protrusions. The plurality of protrusions are disposed on the base 214. That is, the arrangement of the plurality of protrusions can be achieved simply by mounting the drag reduction unit 21 on the surface of the blade body 10, which facilitates operation.

[0043] like Figure 4As shown, in some examples, the height of the base 214 is h0. If the height of the base 214 is too large, it will easily increase the thickness of the entire blade 100, increase the mass of the blade 100, and affect the working efficiency of the blade 100. Therefore, h0 can be limited to between 0 and 100 μm. h0 can be any point value of 0, 25 μm, 50 μm, 75 μm, and 100 μm or a range value between any two. Thus, based on mounting multiple protrusions to the surface of the blade body 10 through the base 214, it is beneficial to reduce the thickness of the blade 100 and improve the working efficiency of the blade 100.

[0044] like Figure 3 and Figure 4 As shown, according to some embodiments of the present invention, a plurality of protrusions include a first protrusion 211, two second protrusions 212, and two third protrusions 213. The first protrusion 211 is arranged symmetrically along a plane, and the height of the first protrusion 211 is h3. The two second protrusions 212 are arranged symmetrically with respect to the first protrusion 211, and the height of the second protrusions 212 is h2. The two third protrusions 213 are arranged symmetrically with respect to the first protrusion 211, and the height of the third protrusions 213 is h1. The second protrusions 212 are located between the first protrusions 211 and the third protrusions 213. The minimum height of the fluid channel 30 between the second protrusions 212 and the third protrusions 213 is c, wherein h... n = c + nh0 (n = 1, 2, 3), specifically, h1 = c + h0, h2 = c + 2h0, h3 = c + 3h0.

[0045] like Figures 3-5 As shown, according to some embodiments of the present invention, along the extending direction of the blade body 10 (e.g. Figure 5 (As shown in the up-down direction), the length of the drag reduction unit 21 is b. If the length of the drag reduction unit 21 is too long, the flow channel of the fluid groove 30 in each drag reduction unit 21 will be too long, which will easily affect the stability of the fluid flow and cause turbulence to easily appear on the surface of the blade 100, which will in turn affect the drag reduction effect of the drag reduction module 20 on the fluid. If the length of the drag reduction unit 21 is too short, the number of drag reduction units 21 that need to be arranged on the entire surface of the blade 100 will be too large, which will affect the convenience of installation. Therefore, b can be limited to between 400μm and 800μm. b can be any point value of 400μm, 500μm, 600μm, 700μm, and 800μm or a range value between any two.

[0046] This can improve the turbulence characteristics of the blade 100 surface, reduce the probability of turbulence on the blade 100 surface, help reduce fluid flow resistance, improve the working efficiency of the blade 100, and at the same time, on the same size blade 100 surface, the number of drag reduction units 21 can be appropriately reduced, which is convenient for installation.

[0047] like Figures 3-5 As shown, according to some embodiments of the present invention, on the surface of the blade 100, and along the extending direction perpendicular to the blade body 10 (e.g., Figure 3 (As shown in the left and right directions), the width of the drag reduction unit 21 is a. If the width of the drag reduction unit 21 is too large, the width of the fluid channel 30 will be too large, making the surface of the blade 100 relatively flat, which weakens the guiding effect on the fluid on the surface of the blade 100 and easily affects the stability of the fluid flow. This will cause turbulence to easily appear on the surface of the blade 100, which will in turn affect the drag reduction effect of the drag reduction module 20 on the fluid. If the width of the drag reduction unit 21 is too small, the width of the fluid channel 30 will be too small, making it difficult for the fluid to flow in the fluid channel 30. This will also cause turbulence to easily appear on the surface of the blade 100, which will affect the drag reduction effect of the drag reduction module 20 on the fluid.

[0048] This allows 'a' to be limited to the range of 400μm-800μm. 'a' can be any point value among 400μm, 500μm, 600μm, 700μm, and 800μm, or a range between any two. This can improve the turbulence characteristics of the blade 100 surface, reduce the probability of turbulence on the blade 100 surface, help reduce fluid flow resistance, and improve the working efficiency of the blade 100.

[0049] According to some specific embodiments of the present invention, the minimum height of the fluid groove 30 between the second protrusion 212 and the third protrusion 213 can be 80 μm, and the height of the base 214 can be 40 μm. On the surface of the blade 100, along the extension direction perpendicular to the blade body 10 (e.g. Figure 3 As shown in the left-right direction), the width of the drag-reducing unit 21 can be 500 μm, along the extension direction of the blade body 10 (e.g., in the left-right direction). Figure 5 (As shown in the up and down direction), the length of the drag reduction unit 21 can be 500μm.

[0050] like Figures 2-4 As shown, in some examples, along the extension direction of the blade body 10 (e.g. Figure 2 (As shown in the vertical direction), the protrusions of the drag reduction units 21 of two adjacent drag reduction modules 20 are staggered. For example, two adjacent drag reduction modules 20 can be projected onto... Figure 4 In the XOY coordinate system, and in the extension direction of the blade body 10 (e.g. Figure 2In the two adjacent protrusions on the vertical direction shown, the projection line of the first side 31 of one protrusion on the XOY coordinate system intersects the projection line of the second side 32 of the other protrusion on the XOY coordinate system. That is, the protrusion corresponds to the fluid channel 30, so that the protrusion can guide the fluid flowing through the fluid channel 30, so that the fluid is evenly distributed in multiple fluid channels 30 during flow. This is beneficial to improve the stability of the fluid flow on the surface of the blade 100, reduce the probability of turbulence on the surface of the blade 100, and thus reduce the flow resistance of the fluid and improve the working efficiency of the blade 100.

[0051] like Figure 1 As shown, in some examples, the number of blades 100 is at least four and at most eight, and multiple blades 100 are arranged at circumferential intervals on the cover of impeller 200; in addition, the thinnest thickness of blades 100 is greater than or equal to 1 mm; specifically, the number and thickness of blades 100 can be set based on the parameters of impeller 200.

[0052] like Figure 2 and Figure 3 As shown, in some examples, the drag reduction unit 21 is integrally formed with the blade body 10, that is, multiple drag reduction units 21 are processed on the surface of the blade 100, which can improve the overall structural strength of the blade 100, improve the impact resistance of the blade 100, and help to improve the service life of the blade 100.

[0053] According to an embodiment of the present invention, an impeller 200 with blades based on a biomimetic shark scute structure includes blades 100 based on a biomimetic shark scute structure. By employing the blades 100, the fluid on the surface of the blades 100 can flow in the fluid channel 30 along the extension direction of the fluid channel 30, which can improve the stability of the fluid flow, improve the turbulence characteristics of the surface of the blades 100, reduce the probability of turbulence in the flow channel, thereby reducing the flow resistance of the fluid, reducing the flow noise of the fluid, improving the working efficiency of the impeller 200, and thus improving the overall performance of the impeller 200.

[0054] Other configurations and operations of the impeller 200 with blades based on a biomimetic shark shield scale structure according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here. In the description of the present invention, "first feature" and "second feature" may include one or more of the features. The up-down direction, left-right direction, and front-back direction are defined as shown in the figures.

[0055] In the description of this invention, unless otherwise expressly 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 not in direct contact but 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.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "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.

[0057] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A blade based on a bionic shark shield scale structure, characterized in that: The blade comprises a blade body and a plurality of drag reduction modules, wherein the plurality of drag reduction modules are arranged on at least one side of the blade body, the plurality of drag reduction modules are arranged in sequence along the extension direction of the blade body, and each of the drag reduction modules comprises a plurality of drag reduction units, a plurality of protrusions are formed on the outer surface of each of the drag reduction units, a fluid groove is formed between two adjacent protrusions, and the fluid groove penetrates the drag reduction unit along the extension direction of the blade body; Each of the drag reduction units comprises a base and a plurality of protrusions, the plurality of protrusions are arranged on the base, and the height of the base is h0; The plurality of protrusions include a first protrusion, two second protrusions and two third protrusions, the first protrusion has a height of h3, the two second protrusions are symmetrically arranged and have a height of h2, the two third protrusions are symmetrically arranged and have a height of h1, the second protrusion is located between the first protrusion and the third protrusion, and the lowest height of the fluid groove between the second protrusion and the third protrusion is c, Among them, hn=c+nh0(n=1, 2, 3).

2. The blade based on the bionic shark shield scale structure according to claim 1, characterized in that: The protrusion has a first side surface and a second side surface arranged opposite to each other, the first side surface and the second side surface of each protrusion intersect with each other, and the first side surface of one of two adjacent protrusions intersect with the second side surface of the other of two adjacent protrusions to form the fluid groove.

3. The blade based on the bionic shark shield scale structure according to claim 2 is characterized in that: The first side surface and the second side surface are both straight inclined surfaces.

4. The blade based on the bionic shark shield scale structure according to claim 2, characterized in that: A plurality of planes are defined, each of the drag reduction units is symmetrical along one of the planes, and an intersection line of the first side surface and the second side surface of a protrusion is located on the plane, and the highest heights of the plurality of protrusions gradually decrease in a direction away from the plane.

5. The blade based on the bionic shark shield scale structure according to claim 1, characterized in that: The height of the substrate is h0, 0≤h0≤100 μm.

6. The blade based on the bionic shark shield scale structure according to claim 1, characterized in that: Along the extension direction of the blade body, the length of the drag reduction unit is b, 400 μm≤b≤800 μm.

7. The blade based on the bionic shark shield scale structure according to claim 1, characterized in that: The width of the drag reduction unit is a, 400 μm≤a≤800 μm.

8. The blade based on the bionic shark shield scale structure according to any one of claims 1 to 7, characterized in that: Along the extension direction of the blade body, the protrusions of the drag reduction units of two adjacent drag reduction modules are staggered.

9. An impeller having blades based on a bionic shark shield scale structure, characterized in that: The invention comprises a blade based on a bionic shark shield scale structure according to any one of claims 1 to 8.

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