Volute based on aquatic insect bionic structure

Abstract

The invention relates to a volute based on an aquatic insect bionic structure. The volute comprises a baffle tongue (a), a volute spiral section (b) and a volute diffusion section (c), the separating tongue (a) comprises a separating tongue head arc (d); the tongue separating head arc (d) is provided with a bionic surface structure (e) with a plurality of rows of concave and convex parts; a flow guide groove (f) with a resistance reduction microstructure is formed in the inner surface of the end, close to the partition tongue (a), of the volute spiral section (c) in the flow channel direction. On the basis of flow control of the bionic structure coupling element, the effect of reducing resistance and noise can be achieved, meanwhile, the flow requirements under different working conditions can be better met, curve humps are reduced or eliminated, and the application range of fluid machinery is widened.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid machinery, and in particular relates to a volute based on an aquatic insect bionic structure. Background Art

[0002] In recent years, as the pace of human exploration of the mysteries of nature has accelerated, bionic structures have shown great potential in the field of flow control technology and have gradually gained widespread attention and application. Among the many bionic objects, aquatic insects, especially the head structure of the yellow-margined water beetle, have become an emerging research hotspot in flow control bionics due to its outstanding performance in complex water flow environments. The non-smooth structure on the back of the head of the yellow-margined water beetle has formed efficient fluid dynamic characteristics after long-term natural selection, which can achieve low-resistance movement in water. The existence of this unique structure plays a key role in optimizing fluid flow. In view of this, this study proposes a volute design idea based on the bionic structure of the head of the yellow-margined water beetle, aiming to improve the dynamic behavior of the fluid inside the volute by imitating the geometric characteristics of its natural surface, thereby improving the operating efficiency and stability of the overall equipment. Summary of the invention

[0003] The purpose of the present invention is to provide a volute based on the bionic structure of aquatic insects, to achieve flow control based on the bionic surface structure arrangement of the volute baffle tongue and the structure of the volute spiral section close to the baffle tongue, and to effectively utilize the guide groove structure combined with the drag reduction microstructure and the bionic surface structure at the arc of the baffle tongue to achieve the effect of drag reduction and noise reduction, while better adapting to the flow and head requirements under different working conditions, reducing or eliminating the curve hump, so as to improve the application range of fluid machinery.

[0004] The present invention provides a volute based on an aquatic insect bionic structure, comprising a partition tongue, a volute spiral section and a volute diffusion section; the partition tongue comprises a partition tongue portion arc;

[0005] The arc of the tongue portion is provided with a bionic surface structure with multiple rows of concave and convex; the inner surface of the spiral section of the volute close to one end of the tongue is provided with a guide groove with a drag-reducing microstructure along the flow direction.

[0006] Furthermore, the placement angle of the partition tongue The arc radius of the tongue portion r1 = (0.005-0.021) D2; wherein n is the rated speed, Q is the pump design flow rate, H is the pump head, and D2 is the impeller outlet diameter.

[0007] Furthermore, the bionic surface structure is provided with irregularly arranged circular depressions, and a cylindrical protrusion structure is attached to the center of the circular depression.

[0008] Furthermore, the circular depression is a hemispherical depression with a diameter of d1=(0.05~0.2)r1, the diameter of the cylindrical protrusion structure inside the circular depression is d2=(0.3~0.65)d1, and the height is h1=(0.35~0.45)d1. A transition arc surface is formed at the junction of the inner surface of the circular depression and the cylindrical protrusion structure, and the fillet radius is r2=0.25(d2-d1).

[0009] Furthermore, the circular depressions are unevenly distributed on the arc surface of the tongue portion, and the distance between each circular depression is s=(1.2-1.5)d1.

[0010] Furthermore, the total length of the guide groove is l=(0.45-0.75)b3, the axis of the guide groove is perpendicular to the impeller blade outlet, and the distance between adjacent guide groove axes is e=(0.017-0.045)b3, wherein b3 is the volute inlet width.

[0011] Furthermore, the cross-sectional profile of the guide groove is semicircular, the semicircular diameter is the largest near the mouthpiece, and gradually decreases to 0 in the direction away from the throat axis, wherein the maximum cross-sectional semicircular diameter is d 3max =e, Where x is the distance from the maximum point of the cross-sectional profile along the axial direction.

[0012] Furthermore, the drag reduction microstructure is cylindrical and symmetrically distributed along the axis of the guide groove. The cylinder radius r3=0.5d3, the top of the cylinder is semicircular, and its arc radius is r3. The ratio of the cylinder depth h2 to the column groove radius r3 is h2 / r3=1.7~2.5.

[0013] Through the above scheme, through the volute based on the bionic structure of aquatic insects and the flow control based on the bionic structure coupling element, it is possible to achieve the effect of reducing drag and noise, while better adapting to the flow requirements under different working conditions, reducing or eliminating the curve hump, and improving the application scope of fluid machinery.

[0014] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the volute based on the bionic structure of aquatic insects of the present invention;

[0016] Figure 2 This is an enlarged plane view of the concave-convex bionic surface structure of the present invention at the tongue portion;

[0017] Figure 3 for Figure 2A three-dimensional diagram of the tongue structure, showing the random distribution of the concave and convex bionic surface structure;

[0018] Figure 4 It is a schematic diagram of the structure of the guide groove provided on the spiral section of the volute close to the partition tongue of the present invention;

[0019] Figure 5 It is a schematic cross-sectional view of the drag reduction microstructure on the bionic guide groove of the present invention.

[0020] Reference numerals:

[0021] a- partition tongue; b- spiral section of volute; c- diffuser section of volute; d- arc of partition tongue; e- bionic surface structure; f- guide groove. DETAILED DESCRIPTION

[0022] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] Ginseng Figures 1 to 5 As shown, this embodiment provides a volute based on the bionic structure of an aquatic insect, and the bionic volute is composed of a baffle a, a volute spiral section b, and a volute diffuser c. A bionic surface structure e with multiple rows of concave and convex is provided at the arc d of the baffle tongue; a guide groove f with a drag-reducing microstructure is provided on the inner surface of the volute spiral section c near one end of the baffle tongue (at least a portion of the lanceolate depression is provided with a drag-reducing microstructure).

[0024] In one embodiment of the present invention, the placement angle of the partition tongue is The arc radius of the tongue portion r1=(0.005-0.021)D2, wherein n is the rated speed, Q is the pump design flow rate, H is the pump head, and D2 is the impeller outlet diameter.

[0025] In one embodiment of the present invention, the concave-convex bionic surface structure at the arc of the tongue portion is irregularly arranged circular depressions with a cylindrical protrusion structure in the center.

[0026] In one embodiment of the present invention, the circular depression is a hemispherical depression with a diameter of d1=(0.05-0.2)r1, the diameter of the cylindrical protrusion inside the depression is d2=(0.3-0.65)d1, the height is h1=(0.7-0.9)d1, and a suitable transition arc surface is formed at the junction of the inner surface of the circular depression and the cylindrical protrusion structure, and the fillet radius is r2=0.25(d2-d1). It is unevenly distributed on the arc surface of the tongue, and the distance between each circular depression is s=(1.2-1.5)d1.

[0027] In one embodiment of the present invention, the inner surface of the volute spiral section near one end of the baffle tongue is arranged along the flow direction with a drag-reducing microstructure guide groove, and its total length is l = (0.45 ~ 0.75) b3, the axis of the guide groove is perpendicular to the impeller blade outlet, and the distance between adjacent guide groove axes is e = (0.017 ~ 0.045) b3, where b3 is the volute inlet width.

[0028] In one embodiment of the present invention, the cross-sectional profile of the guide groove structure is semicircular, the semicircular diameter is the largest near the mouthpiece, and gradually decreases to 0 in the direction away from the throat axis, wherein the maximum cross-sectional semicircular diameter is Where x is the distance from the maximum point of the cross-sectional profile along the axial direction.

[0029] In one embodiment of the present invention, the cylindrical drag reduction microstructure is symmetrically distributed along the axis of the guide groove, the cylinder radius r3 = 0.5d3, the top of the cylinder is semicircular, the arc radius is r3, and the ratio of the cylinder depth h2 to the column groove radius r3 is h2 / r3 = 1.7~2.5.

[0030] The bionic volute is based on the flow control of the bionic structure coupling element, which can achieve the effect of reducing drag and noise. At the same time, it can better adapt to the flow and head requirements under different working conditions, reduce or eliminate the curve hump, and improve the application scope of fluid machinery.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A volute based on a bionic structure of an aquatic insect, characterized in that: It comprises a partition tongue (a), a volute spiral section (b) and a volute diffuser section (c); the partition tongue (a) comprises a partition tongue portion arc (d); The arc of the tongue portion (d) is provided with a bionic surface structure (e) with multiple rows of concave and convex surfaces; the inner surface of the volute spiral section (c) close to one end of the tongue (a) is provided with a guide groove (f) with a drag-reducing microstructure along the flow direction.

2. The volute based on the aquatic insect bionic structure according to claim 1, characterized in that: The placement angle of the partition tongue (a) The arc radius of the tongue portion r1=(0.005-0.021)D2; wherein n is the rated speed, Q is the pump design flow rate, H is the pump head, and D2 is the impeller outlet diameter.

3. The volute based on the aquatic insect bionic structure according to claim 2 is characterized in that: The bionic surface structure (e) is provided with irregularly arranged circular depressions, and a cylindrical protrusion structure is attached to the center of the circular depression.

4. The volute based on the aquatic insect bionic structure according to claim 3 is characterized in that: The circular depression is a hemispherical depression with a diameter of d1=(0.05~0.2)r1, the diameter of the cylindrical protrusion structure inside the circular depression is d2=(0.3~0.65)d1, and the height is h1=(0.35~0.45)d1. A transition arc surface is formed at the junction of the inner surface of the circular depression and the cylindrical protrusion structure, and the fillet radius is r2=0.25(d2-d1).

5. The volute based on the aquatic insect bionic structure according to claim 4, characterized in that: The circular depressions are unevenly distributed on the surface of the arc (d) of the tongue portion, and the distance between each circular depression is s=(1.2-1.5)d1.

6. The volute based on the aquatic insect bionic structure according to claim 1, characterized in that: The total length of the guide groove (f) is l=(0.45~0.75)b3, the axis of the guide groove (f) is perpendicular to the impeller blade outlet, and the distance between adjacent guide groove axes is e=(0.017~0.045)b3, where b3 is the volute inlet width.

7. The volute based on the aquatic insect bionic structure according to claim 6, characterized in that: The cross-sectional profile of the guide groove (f) is semicircular, with the semicircular diameter being the largest near the mouthpiece and gradually decreasing to 0 in the direction away from the throat axis, wherein the maximum cross-sectional semicircular diameter is d 3max =e, Where x is the distance from the maximum point of the cross-sectional profile along the axial direction.

8. The volute based on the aquatic insect bionic structure according to claim 7, characterized in that: The drag reduction microstructure is cylindrical and symmetrically distributed along the axis of the guide groove (f). The cylinder radius r3=0.5d3, the top of the cylinder is semicircular, and its arc radius is r3. The ratio of the cylinder depth h2 to the column groove radius r3 is h2 / r3=1.7~2.5.

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