| 摘要 |
A centrifugal pump is provided, which includes a rotor assembly, the rotor assembly includes an impeller including multiple blades and a blade fixing portion, the blades and the blade fixing portion are integrally formed by injection molding, and the blades are circumferentially distributed at equal intervals along the blade fixing portion. The blade includes a first side, a second side, a blade top portion and a blade root portion, and the blade root portion and the blade fixing portion are fixed by injection molding. The blade top portion is a cantilever end of the blade, and the first side and the second side are arranged between the blade root portion and the blade top portion. The rotor assembly arranged in such manner can improve the hydraulic efficiency and lift of the centrifugal pump. |
| 主权项 |
1. A centrifugal pump, comprising a rotor assembly and a shaft, wherein the rotor assembly is rotatable about the shaft or rotatable together with the shaft, the rotor assembly comprises an impeller, and the impeller is rotatable about the shaft or rotatable together with the shaft, wherein
the impeller comprises blades and a blade fixing portion, the blades are uniformly distributed in a circumferential direction of the blade fixing portion, the impeller defines a hypothetical cylinder surface taking a central shaft of the blade fixing portion as a center line, intersections defined by the blades intersecting with the hypothetical cylinder surface are distributed at equal intervals in a circumferential direction of the hypothetical cylinder surface; each of the blades comprises a first side, a second side, a blade top portion and a blade root portion, the blade root portion and the blade fixing portion are formed by injection molding or fixed by injection molding, the blade top portion is a free end of each of the blades, the first side and the second side are located between the blade root portion and the blade top portion, each of the first side and the second side comprises a convex portion and a concave portion, and the convex portion and the concave portion are smoothly connected; a blade cross section is defined by cutting each of the blades via the hypothetical cylinder surface, the blade cross section comprises a first intersecting line, a second intersecting line, a third intersecting line and a fourth intersecting line, wherein the first intersecting line is an intersecting line defined by the hypothetical cylinder surface intersecting with the first side, the second intersecting line is an intersecting line defined by the hypothetical cylinder surface intersecting with the second side, the third intersecting line is an intersecting line defined by the hypothetical cylinder surface intersecting with the blade top portion, and the fourth intersecting line is an intersecting line defined by the hypothetical cylinder surface intersecting with the blade root portion, and a middle line is a straight line passing through a middle point of the third intersecting line and parallel to the central shaft of the impeller; and a height of the blade in the blade cross section is defined as a distance from the fourth intersecting line to, an intersection between, the first intersecting line or the second intersecting line, and a line parallel to the fourth intersecting line, in the blade cross section at a portion with a first height (H1), a distance from the first intersecting line to the middle line is a first distance (L1), and a distance from the second intersecting line to the middle line is a second distance (L2), and at a portion with a second height (H2), a distance from the first intersecting line to the middle line is a third distance (L1′), and a distance from the second intersecting line to the middle line is a fourth distance (L2′), the following relationship is satisfied: in the case that the first height (H1) is greater than the second height (H2), the first distance (L1) is less than or equal to the third distance (L1′), and the second distance (L2) is less than or equal to the fourth distance (L2′). |
