WO2018095157A1

WO2018095157A1 - Centrifugal impeller and pump having same

Info

Publication number: WO2018095157A1
Application number: PCT/CN2017/106056
Authority: WO
Inventors: 蒋婷婷; 顾文海; 史长忠
Original assignee: 广东威灵电机制造有限公司; 美的威灵电机技术（上海）有限公司
Priority date: 2016-11-23
Filing date: 2017-10-13
Publication date: 2018-05-31

Abstract

A centrifugal impeller (100) and a pump having same. The centrifugal impeller (100) comprises: a body (10); a plurality of main blades (20), provided apart from one another along the circumference of the body (10) and uniformly distributed on one side of the body (10); and a plurality of auxiliary blades (30), provided apart from one another along the circumference of the body (10) and uniformly distributed on the one side of the body (10); the plurality of auxiliary blades (30) are distributed in a staggered manner with the plurality of main blades (20); the faces of the main blades (20) and the auxiliary blades (30), facing away from the body (10), have the outlines which are formed as step shapes.

Description

Centrifugal impeller and pump with same

Technical field

The present invention relates to the field of fluid machinery technology, and more particularly to a centrifugal impeller and a pump therewith.

Background technique

With the development of a heating and pumping fluid integrated device, the requirements for the pump are also getting higher and higher, both to meet the heating demand and to have higher performance. The impeller, as the core component of the pump, is also facing high-performance pressure, but the semi-closed impeller in the related art generally has the problem of low efficiency.

Summary of the invention

The present invention aims to solve at least one of the above technical problems to some extent.

To this end, the present invention provides a centrifugal impeller having a simple structure, low water inlet resistance, high hydraulic efficiency, and can effectively split the fluid, and the working vibration is small, which is beneficial to improving the overall performance of the pump.

The invention also proposes a pump having the centrifugal impeller described above.

A centrifugal impeller according to an embodiment of the first aspect of the present invention includes: a body; a plurality of main blades, a plurality of the main blades being spaced apart along a circumferential direction of the body, and uniformly distributed on one side of the body; a plurality of the sub-blades, the plurality of sub-blades are spaced apart along a circumference of the body, and are evenly distributed on one side of the body, and the plurality of sub-blades are alternately distributed with a plurality of the main blades, the main The outer contour of the blade and the side of the sub-blade facing away from the body is formed in a stepped shape.

According to the centrifugal impeller according to the embodiment of the present invention, by arranging a plurality of main blades and sub blades arranged in a staggered manner on the body, and configuring the main blades and the sub blades to have a plurality of step faces on a side facing away from the body, The optimized design of the impeller structure can reduce the water inlet resistance, increase the outlet area, improve the hydraulic efficiency of the impeller, effectively divert the fluid, and reduce the vibration of the centrifugal impeller during operation, thereby contributing to the improvement of the overall performance of the pump.

In addition, the centrifugal impeller according to the embodiment of the present invention may further have the following additional technical features:

According to an embodiment of the present invention, the body is formed substantially in a ring shape, and a vertical distance between the inner ring of the main blade and the sub-blade and the body is smaller than the main blade in a radial direction of the body And a vertical distance between the outer ring of the secondary blade and the body.

According to an embodiment of the invention, each of the main blades is provided with m steps, m being a positive integer and 3 ≤ m ≤ 6.

According to an embodiment of the present invention, in the radial direction of the body, an outer contour of each of the main blades includes (m+1) step faces in order from the inside to the outside, between two adjacent step faces The angle is greater than 90° and less than 180°.

According to an embodiment of the present invention, the main blade is provided with four steps. In the radial direction of the body, the outer contour of the main blade includes a first step surface, a second step surface, and a second portion from the inside to the outside. Three step faces, fourth step faces and fifth a step surface, the first step surface is substantially perpendicular to the body, and the second step surface, the third step surface, the fourth step surface, and the fifth step surface are respectively disposed obliquely with respect to a plane where the body is located.

According to an embodiment of the present invention, an angle defined between the first step surface and the second step surface is α, and a clip defined between the second step surface and the third step surface An angle β, an angle defined between the third step surface and the fourth step surface is γ, and an angle defined between the fourth step surface and the fifth step surface is δ, 90° < α < 120 °, 95 ° < β < 160 °, 100 ° < γ < 140 ° 105 ° < δ < 145 °.

According to an embodiment of the invention, each of the sub-blades is provided with n steps, n being a positive integer and 2 ≤ n ≤ 6.

According to an embodiment of the present invention, in the radial direction of the body, an outer contour of each of the sub-blades includes (n+1) step faces in order from the inside to the outside, between adjacent two of the step faces The angle is greater than 90° and less than 180°.

According to an embodiment of the present invention, the sub-blade is provided with three steps. In the radial direction of the body, the outer contour of the sub-blade includes a sixth step surface, a seventh step surface, and an eighth portion from the inside to the outside. The step surface and the ninth step surface, the sixth step surface, the seventh step surface, the eighth step surface, and the ninth step surface are respectively disposed obliquely with respect to a plane in which the body is located.

According to an embodiment of the present invention, an angle defined between the sixth step surface and the seventh step surface is A, and a clip defined between the seventh step surface and the eighth step surface The angle is B, and the angle defined between the eighth step surface and the ninth step surface is C, 90°<A<110°, 95°<B<145°, 100°<C<150° .

According to an embodiment of the invention, one of the two adjacent ones of the main blades is provided with one of the sub-blades, and one of the two adjacent sub-blades is provided with one of the main blades.

According to an embodiment of the invention, the other side of the body is provided with a rear cover hole, and the rear cover hole has three holes.

According to an embodiment of the invention, the other side of the body is provided with a plurality of back blades, and the plurality of the back blades are evenly spaced apart in the circumferential direction of the body at an inner circumference of the body.

A pump according to an embodiment of the second aspect of the present invention includes the centrifugal impeller described in the above embodiments.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a schematic structural view of a centrifugal impeller at a viewing angle according to an embodiment of the present invention;

2 is a schematic structural view of a centrifugal impeller according to another embodiment of the present invention;

Figure 3 is a front elevational view of a centrifugal impeller in accordance with an embodiment of the present invention;

4 is a side view of a centrifugal impeller in accordance with an embodiment of the present invention.

Reference mark:

100: centrifugal impeller;

10: body; 11: rear cover hole; 12: hub;

20: the main blade;

30: auxiliary blade;

401: a first step surface; 402: a second step surface; 403: a third step surface;

404: fourth step surface; 405: fifth step surface; 406: sixth step surface;

407: seventh step surface; 408: eighth step surface; 409: ninth step surface;

50: Back blade.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

A centrifugal impeller 100 according to an embodiment of the first aspect of the present invention will be specifically described below with reference to FIGS. 1 through 4.

The centrifugal impeller 100 according to an embodiment of the present invention includes a body 10, a plurality of main blades 20, and a plurality of sub blades 30. Specifically, the plurality of main blades 20 are circumferentially spaced along the body 10 and uniformly distributed on one side of the body 10, and the plurality of sub-blades 30 are disposed along the circumferential direction of the body 10 and uniformly distributed on one of the bodies 10. On the side (upper side as shown in FIG. 1), the plurality of sub-blades 30 are alternately distributed with the plurality of main blades 20, and the main blades 20 and the sub-blades 30 are facing away from one side of the body 10 (upper end as shown in FIG. 1). The outer contour is formed in a stepped shape.

In other words, the centrifugal impeller 100 is mainly composed of the body 10, the plurality of main blades 20, and the plurality of sub blades 30, wherein the body 10 can be formed in a horizontal plane (a plane perpendicular to the up and down direction as shown in FIG. 1). The plate member, the plurality of main blades 20 and the plurality of sub-blades 30 are all disposed on the front surface of the body 10 (the upper surface as shown in FIG. 1). Specifically, the plurality of main blades 20 are evenly spaced along the circumferential direction of the body 10. And each of the main blades 20 is formed in an arc shape extending from the outer side to the inner side of the body 10, the plurality of sub-blades 30 are evenly spaced apart along the circumferential direction of the body 10, and each of the sub-blades 30 is formed to be inwardly along the outer side of the body 10. The extended arc shape, for example, the plurality of main blades 20 and the plurality of sub blades 30 may form a spiral with respect to the center of rotation of the centrifugal impeller 100, and the plurality of main blades 20 and the plurality of sub blades 30 may be along the circumference of the body 10. The staggered arrangement defines a plurality of flow channels spaced apart along the circumference of the body 10.

Further, each of the main blades 20 has the same shape and the same size, and the plurality of main blades 20 are arranged symmetrically with respect to the center of the body 10; each of the sub-blades 30 has the same shape and the same size, and the plurality of sub-blades 30 The central symmetry is arranged with respect to the center of the body 10, wherein a side surface of each of the main blades 20 and the sub-blades 30 facing away from the body 10 (the upper end surface as shown in FIG. 1) forms an outer contour line forming a stepped shape.

Thus, according to the centrifugal impeller 100 of the embodiment of the present invention, the plurality of main blades 20 and the sub blades 30 which are staggered are disposed on the body 10, and the main blades 20 and the sub blades 30 are disposed facing away from the body 10. The structure of multiple step faces on one side optimizes the structure of the impeller, which can reduce the water inlet resistance, increase the outlet area, improve the hydraulic efficiency of the impeller, effectively divert the fluid, and reduce the centrifugal impeller 100 during operation. Vibration, which helps to improve the overall performance of the pump.

Optionally, the body 10 is formed substantially in a ring shape, and the vertical distance between the inner ring of the main blade 20 and the sub-blade 30 and the body 10 is smaller than the outer ring of the main blade 20 and the sub-blade 30 and the body 10 in the radial direction of the body 10. The vertical distance between.

Specifically, as shown in FIGS. 1 and 2, in the present embodiment, the body 10 forms an annular plate member disposed in a horizontal plane, and the plurality of main blades 20 and the plurality of sub-blades 30 are disposed on the annular body. The front surface of each of the main blades 20 and each of the sub-blades 30 facing away from the body 10 (the upper end surface shown in FIG. 1) forms a stepped surface, and the main blades 20 are located outside. The vertical distance between the upper end surface and the body 10 is greater than the vertical distance between the upper end surface of the main blade 20 located on the inner side and the body 10. The vertical distance between the upper end surface of the auxiliary blade 30 on the outer side and the body 10 is greater than that of the auxiliary blade. The vertical distance between the upper end surface of the inner side 30 and the body 10.

That is, the height of the outermost structure of the main blade 20 is higher than the height of the structure located at the innermost side, and the height of the outermost structure of the sub-blade 30 is higher than the height of the structure located at the innermost side, wherein the main blade 20 and the sub-blade The structure of the lowermost inner height of 30 is more advantageous for reducing the water inlet resistance, and the structure of the main blade 20 and the sub-blade 30 having the higher outermost height can avoid the air, further ensuring a certain amount of water output, and further reducing Small reflux phenomenon.

Advantageously, each of the main blades 20 is provided with m steps, m being a positive integer and 3 ≤ m ≤ 6. For example, each of the main blades 20 is respectively provided with three, five or six steps. Correspondingly, each main blade 20 has four, six or seven step faces, and each step face is between the step 10 and the body 10. The vertical distances are not equal. Controlling the stepped structure of each of the main blades 20 facing away from the side of the body 10 within the above range can ensure that the working efficiency of the centrifugal impeller 100 is improved on the basis of less processing difficulty, thereby improving the overall performance of the pump. The cost performance of the centrifugal impeller 100 is guaranteed.

In some embodiments of the present invention, the main blade 20 is provided with four steps. In the radial direction of the body 10, the outer contour of the main blade 20 includes a first step surface 401 and a second step surface 402 in order from the inside to the outside. a third step surface 403, a fourth step surface 404, and a fifth step surface 405, the first step surface 401 is substantially perpendicular to the body 10, the second step surface 402, the third step surface 403, the fourth step surface 404, and the fifth step The faces 405 are respectively disposed obliquely with respect to the plane in which the body 10 is located.

Specifically, as shown in FIGS. 1 and 3, the main blade 20 is provided on the front surface of the body 10 (upper surface as shown in FIG. 1), and the main blade 20 extends from the outer side of the body 10 toward the inner side of the body 10, and the main blade 20 One side surface facing away from the body 10 (the upper surface as shown in FIG. 1) forms a first step surface 401, a second step surface 402, and a third step surface 403 which are sequentially disposed in the radial direction of the body 10 from the inside to the outside. The fourth step surface 404 and the fifth step surface 405, that is, the first step surface 401 are located at the innermost side of the body 10, and the first step surface 401 substantially forms a plane perpendicular to the imaginary plane where the body 10 is located, and the fifth step surface 405 Located at the outermost side of the body 10, and the second step surface 402, the third step surface 403, the fourth step surface 404, and the fifth The step faces 405 are respectively disposed obliquely with respect to the imaginary plane in which the body 10 is located.

Therefore, the main blade 20 is disposed in a structure with a plurality of step faces facing away from the body 10, which can reduce the water inlet resistance, increase the outlet area, improve the hydraulic efficiency of the impeller, effectively split the fluid, and reduce the centrifugation. The vibration of the impeller 100 during operation is beneficial to improve the overall performance of the pump.

Optionally, the outer contour of each of the main blades 20 includes (m+1) step faces in order from the inside to the outside, and the angle between the adjacent two step faces is greater than 90° and less than 180°.

Specifically, an angle defined between the first step surface 401 and the second step surface 402 is α, and an angle defined between the second step surface 402 and the third step surface 403 is β, and the third step surface 403 The angle defined between the fourth step surface 404 and the fifth step surface 404 is δ, and the angle defined between the fourth step surface 404 and the fifth step surface 405 is δ, 90° < α < 180°, 90° < β < 180°, 90° < γ < 180°, 90° < δ < 180°.

If the first step surface 401 is perpendicular to the plane in which the body 10 is located, the second step surface 402 is disposed obliquely with respect to the plane in which the body 10 is located and between the plane in which the second step surface 402 is located and the plane in which the first step surface 401 is located. The angle α is 100°, 120°, 160° or 170°, etc.; the third step surface 403 is inclined with respect to the plane in which the body 10 is located, and the plane where the third step surface 403 is located and the plane where the second step surface 402 is located The angle β between them is 110°, 150° or 160°, etc.; the fourth step surface 404 is inclined with respect to the plane in which the body 10 is located, and the plane where the fourth step surface 404 is located and the plane where the third step surface 403 is located The angle γ between the two is 95°, 120°, 160° or 175°, etc.; the fifth step surface 405 is inclined with respect to the plane in which the body 10 is located, and the plane where the second step surface 402 is located and the fourth step surface 404 are located. The angle between the planes is 110°, 140° or 160°. By optimizing the structure of the main blade 20, the overall performance of the pump can be improved, and the main blade 20 has a simple structure, is easy to process and manufacture, and has low production cost.

Preferably, 90° < α < 120°, 95° < β < 160°, 100° < γ < 140° 105° < δ < 145°. That is, the angle α defined between the first step surface 401 and the second step surface 402 satisfies the condition of greater than 90° and less than 120°, and is defined between the second step surface 402 and the third step surface 403. The angle β satisfies the condition of more than 95° and 160°, and the angle γ defined between the third step surface 403 and the fourth step surface 404 satisfies the condition of more than 100° and less than 140°, and the fourth step surface 404 and The angle δ defined between the fifth step faces 405 satisfies the condition of more than 105° and less than 145°, and the first step surface 401, the second step surface 402, the third step surface 403, and the fourth step surface 404 can be ensured. The fifth step surface 405 gradually increases in height along the inner and outer directions of the body 10, thereby further ensuring the purpose of reducing the water inlet resistance, increasing the outlet area, and improving the hydraulic efficiency of the impeller, thereby effectively improving the overall performance of the pump.

Advantageously, each sub-blade 30 is provided with n steps, n being a positive integer and 2 ≤ n ≤ 6. For example, each main blade 20 is provided with 2, 5 or 6 steps respectively, and correspondingly, each main blade 20 has 3, 6 or 7 step faces, between each step face and the body 10. The vertical distances are not equal. Controlling the step structure of each of the sub-blades 30 facing away from the side of the body 10 within the above range can ensure that the working efficiency of the centrifugal impeller 100 is improved on the basis of less processing difficulty, thereby improving the overall performance of the pump. The cost performance of the centrifugal impeller 100 is guaranteed.

In some embodiments of the present invention, the sub-blade 30 is provided with three steps. In the radial direction of the body 10, the outer contour of the sub-blade 30 includes a sixth step surface 406, a seventh step surface 407, and a portion from the inside to the outside. The eight step faces 408 and the ninth step faces 409, the sixth step faces 406, the seventh step faces 407, the eighth step faces 408, and the ninth step faces 409 are respectively disposed obliquely with respect to the plane in which the body 10 is located.

Specifically, as shown in FIGS. 1 and 3, the sub-blades 30 are provided on the front surface of the body 10 (upper surface as shown in FIG. 1), and the sub-blades 30 extend from the outer side of the body 10 toward the inner side of the body 10, and the sub-blades 30 One side surface facing away from the body 10 (upper surface as shown in FIG. 1) forms a sixth step surface 406, a seventh step surface 407, and an eighth step surface 408 which are sequentially disposed in the radial direction of the body 10 from the inside to the outside. The ninth step surface 409, that is, the sixth step surface 406 is located at the innermost side of the body 10, the ninth step surface 409 is located at the outermost side of the body 10, and the sixth step surface 406, the seventh step surface 407, and the eighth step surface 408 And the ninth step surface 409 are respectively disposed obliquely with respect to an imaginary plane in which the body 10 is located.

Therefore, the auxiliary blade 30 is disposed in a structure with a plurality of step faces facing away from the body 10, and the optimal design of the impeller structure can reduce the water inlet resistance, increase the exit area, and improve the hydraulic efficiency of the impeller. The fluid is shunted to reduce the vibration of the centrifugal impeller 100 during operation, thereby contributing to the improvement of the overall performance of the pump.

Optionally, the outer contour of each sub-blade 30 includes (n+1) step faces in order from the inside to the outside, and the angle between adjacent two step faces is greater than 90° and less than 180°.

Specifically, an angle defined between the sixth step surface 406 and the seventh step surface 407 is A, and an angle defined between the seventh step surface 407 and the eighth step surface 408 is B, and the eighth step surface 408 The angle defined between the ninth step surface 409 and the ninth step surface 409 is C, 90° < A < 180°, 90° < B < 180°, and 90° < C < 180°.

For example, the sixth step surface 406 is disposed obliquely with respect to the plane in which the body 10 is located, the seventh step surface 407 is disposed obliquely with respect to the plane in which the body 10 is located, and the plane in which the seventh step surface 407 is located and the plane in which the sixth step surface 406 is located The angle A between the two is 100°, 120°, 160° or 170°, etc.; the eighth step surface 408 is inclined with respect to the plane in which the body 10 is located, and the plane where the eighth step surface 408 is located and the seventh step surface 407 are located. The angle B between the planes is 110°, 150° or 160°, etc.; the ninth step surface 409 is disposed obliquely with respect to the plane in which the body 10 is located, and the plane in which the ninth step surface 409 is located and the plane in which the eighth step surface 408 is located The angle C between them is 95°, 120°, 160° or 175°.

Preferably, 90° < A < 110°, 95° < B < 145°, 100° < C < 150°. In other words, the angle A defined between the seventh step surface 407 and the sixth step surface 406 satisfies the condition of more than 90° and less than 110°, and the angle defined between the eighth step surface 408 and the seventh step surface 407 is defined. B satisfies the condition of more than 95° and 145°, and the angle C defined between the ninth step surface 409 and the eighth step surface 408 satisfies the condition of more than 100° and less than 150°, and the sixth step surface 406 can be ensured. The seventh step surface 407, the eighth step surface 408, and the ninth step surface 409 gradually increase in height along the radial direction of the body 10, thereby further ensuring reduction of water inlet resistance, increase of exit area, and improvement of impeller hydraulic efficiency. The purpose of the pump is to effectively improve the overall performance of the pump.

Wherein, any two adjacent main blades 20 are provided with one sub-blade 30, and any two adjacent sub-blades 30 A main blade 20 is provided between them. Referring to FIG. 3, a plurality of main blades 20 and a plurality of sub blades 30 are respectively spaced apart in the circumferential direction of the body 10, and the number of the main blades 20 is equal to the number of the sub blades 30, and any two adjacent main blades 20 are along The radial distances of the bodies 10 are equal, and the distance between any adjacent two sub-blades 30 in the radial direction of the body 10 is equal. By arranging the plurality of main blades 20 and the plurality of sub-blades 30 in a staggered and spaced arrangement, the fluid can be effectively shunted, and the vibration caused by the impact of the fluid during the operation of the centrifugal impeller 100 is reduced, which is beneficial to improve the operation of the pump. Overall performance.

Alternatively, the outer end of the main blade 20 and the outer end of the sub-blade 30 are flush in the circumferential direction of the body 10, and the inner end of the main blade 20 is in the radial direction of the body 10 beyond the inner end of the sub-blade 30, that is, the main The length of the blade 20 is greater than the length of the secondary blade 30, and the optimal arrangement of the arrangement of the primary blade 20 and the secondary blade 30 is advantageous for improving the overall performance of the centrifugal impeller 100.

Further, the other side of the body 10 is provided with a rear cover hole 11 and three rear cover holes 11 are provided. Referring to FIG. 3, three rear cover holes 11 are disposed on the body 10, and three rear cover holes 11 are respectively located between the adjacent main blades 20 and the auxiliary blades 30, so as to reduce the back pressure of the impeller and improve the effect. The performance of the centrifugal impeller 100 enhances the overall performance of the pump.

Advantageously, the other side of the body 10 is provided with a plurality of back blades 50 that are evenly spaced along the circumference of the body 10 and are disposed uniformly on the inner circumference of the body 10. Specifically, as shown in FIG. 2, the middle portion of the body 10 is provided with a hub 12, and a plurality of back blades 50 are circumferentially spaced apart on the back surface of the body 10 (the lower surface as shown in FIG. 2) and connected to the hub 12. That is, the plurality of back blades 50 are located on the inner ring of the body 10. When the centrifugal impeller 100 is in operation, the plurality of back blades 50 can be used to offset some or all of the axial force to improve the working performance of the centrifugal impeller 100.

The pump according to the embodiment of the second aspect of the present invention includes the centrifugal impeller 100 of the above embodiment. When the centrifugal impeller 100 in the pump is in operation, fluid enters from the axial inlet of the centrifugal impeller 100, and after the fluid passes through the impeller, it flows out in the radial direction of the centrifugal impeller 100. The structure of the centrifugal impeller 100 of the structure is favorable. Reduce the water inlet resistance, improve the hydraulic efficiency of the impeller, effectively reduce the backflow, ensure the water output of the impeller, and improve the overall performance. If the pump needs to heat the fluid, the impeller of the structure can also increase the direct shear force of the fluid and the heating element, thereby improving the heating efficiency.

Since the centrifugal impeller 100 according to the embodiment of the present invention has the above technical effects, the pump according to the embodiment of the present invention also has the above technical effects, that is, the pump has a simple and compact structure, low water inlet resistance, high hydraulic efficiency, and Large amount of water and high overall performance.

The centrifugal impeller 100 and other configurations and operations of the pump in accordance with embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation or position of indications such as "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. The relationship is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of the description of the invention and the simplification of the description, and does not indicate or imply that the device or component referred to has a specific orientation, is constructed and operated in a specific orientation, and thus It is not to be understood as limiting the invention.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may be express or implied. The ground includes one or more of the features. In the description of the present invention, the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or connected integrally; may be mechanical connection or electrical connection; may be directly connected, or may be indirectly connected through an intermediate medium, and may be internal communication between the two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, it is understood that the foregoing embodiments are illustrative and not restrictive Variations, modifications, alterations and variations of the above-described embodiments are possible within the scope of the invention.

Claims

A centrifugal impeller, comprising:

Ontology

a plurality of main blades, a plurality of the main blades being spaced apart along a circumference of the body and uniformly distributed on one side of the body;

a plurality of sub-blades, the plurality of sub-blades are spaced apart along a circumferential direction of the body, and are evenly distributed on one side of the body, and the plurality of sub-blades are alternately distributed with a plurality of the main blades, The outer contour of the main blade and the side surface of the sub-blade facing away from the body is formed in a stepped shape.
The centrifugal impeller according to claim 1, wherein the body is formed substantially in a ring shape, and between the inner ring of the main blade and the sub-blade and the body in a radial direction of the body The vertical distance is less than a vertical distance between the outer ring of the primary blade and the secondary blade and the body.
The centrifugal impeller according to claim 1, wherein each of said main blades is provided with m steps, m is a positive integer and 3 ≤ m ≤ 6.
The centrifugal impeller according to claim 3, characterized in that, in the radial direction of the body, the outer contour of each of the main blades includes (m+1) step faces in order from the inside to the outside, two adjacent The angle between the step faces is greater than 90° and less than 180°.
The centrifugal impeller according to claim 3, wherein the main blade is provided with four steps, and in the radial direction of the body, the outer contour of the main blade includes a first step surface from the inside to the outside. a second step surface, a third step surface, a fourth step surface, and a fifth step surface, the first step surface being substantially perpendicular to the body, the second step surface, the third step surface, and the fourth step surface And the fifth step surface are respectively disposed obliquely with respect to a plane where the body is located.
The centrifugal impeller according to claim 5, wherein an angle defined between the first step surface and the second step surface is α, the second step surface and the third step An angle defined between the faces is β, an angle defined between the third step face and the fourth step face is γ, and a limit between the fourth step face and the fifth step face is defined The angle is δ,

90° < α < 120 °, 95 ° < β < 160 °, 100 ° < γ < 140 ° 105 ° < δ < 145 °.
The centrifugal impeller according to claim 2, wherein each of said sub-blades is provided with n steps, n being a positive integer and 2 ≤ n ≤ 6.
The centrifugal impeller according to claim 7, wherein in the radial direction of the body, an outer contour of each of the sub-blades includes (n+1) step faces in order from the inside to the outside, adjacent to two The angle between the step faces is greater than 90° and less than 180°.
The centrifugal impeller according to claim 7, wherein said sub-blade is provided with three steps, In the radial direction of the body, the outer contour of the auxiliary blade includes a sixth step surface, a seventh step surface, an eighth step surface and a ninth step surface in order from the inner side to the outer side, and the sixth step surface and the seventh step surface The eighth step surface and the ninth step surface are respectively disposed obliquely with respect to a plane where the body is located.
The centrifugal impeller according to claim 9, wherein an angle defined between the sixth step surface and the seventh step surface is A, and the seventh step surface and the eighth step An angle defined between the faces is B, and an angle defined between the eighth step face and the ninth step face is C,

90°<A<110°, 95°<B<145°, 100°<C<150°.
A centrifugal impeller according to any one of claims 1 to 10, wherein one of said two adjacent said main blades is provided with said one sub-blade, any two adjacent said sub-blades One of the main blades is provided between the blades.
The centrifugal impeller according to any one of claims 1 to 10, wherein the other side of the body is provided with a rear cover hole, and the rear cover hole has three holes.
The centrifugal impeller according to any one of claims 1 to 10, wherein the other side of the body is provided with a plurality of back blades, and the plurality of the back blades are spaced apart in the circumferential direction of the body It is evenly arranged on the inner circumference of the body.
A pump comprising the centrifugal impeller of any of claims 1-13.