Centrifugal impeller comprising vanes formed by sheet metal stamping

Abstract

A centrifugal impeller including a disk, a cover, and a plurality of vanes. The plurality of vanes are disposed between the disk and the cover; each of the plurality of vanes includes an inlet edge, an outlet edge, a blade root, and a blade top. A curved corner is disposed at a joint of the outlet edge and the blade top, and the curved corner bends towards the center of a rotation axis L of the centrifugal impeller. The centrifugal impeller features a stabilized shape of the plurality of vanes, reduced springback caused by elastic recovery after sheet metal stamping, and minimized deviation from the intended vane profile.

What is claimed is: 
     
         1 . A centrifugal impeller, comprising a disk, a cover, and a plurality of vanes manufactured by sheet metal stamping; wherein the plurality of vanes is disposed between the disk and the cover, and each of the plurality of vanes comprises an inlet edge, an outlet edge, a blade root, and a blade top; a curved corner is disposed at a joint of the outlet edge and the blade top, and the curved corner bends towards a center of a rotation axis L of the centrifugal impeller. 
     
     
         2 . The centrifugal impeller of  claim 1 , wherein the outlet edge comprises a vertex A and a point G; the blade top comprises a point H; the vertex A and the point G are connected to form a first curve AG; the vertex A and the point H are connected to form a second curve AH; the point G and the point H are connected to form a third curve GH; the curved corner is formed on each of the plurality of vanes by the first curve AG, the second curve AH, and the third curve GH; and a length of the first curve AG is less than or equal to half of a length of the outlet edge. 
     
     
         3 . The centrifugal impeller of  claim 1 , wherein the centrifugal impeller is intercepted by several planes perpendicular to the rotation axis L of the centrifugal impeller and intersecting with the first curve AG, to form a plurality of vane profile lines; the third curve GH and the outlet edge intersect with the plurality of vane profile lines, forming a plurality of curves VO; and lengths of the curves VO increase from the point G to the vertex A. 
     
     
         4 . The centrifugal impeller of  claim 2 , wherein the centrifugal impeller is intercepted by several planes perpendicular to the rotation axis L of the centrifugal impeller and intersecting with the first curve AG, to form a plurality of vane profile lines; the third curve GH and the outlet edge intersect with the plurality of vane profile lines, forming a plurality of curves VO; and lengths of the curves VO increase from the point G to the vertex A. 
     
     
         5 . A centrifugal impeller, comprising a disk, a cover, and a plurality of vanes manufactured by sheet metal stamping; wherein the plurality of vanes is disposed between the disk and the cover, and each of the plurality of vanes comprises an inlet edge, an outlet edge, a blade root, and a blade top; a crease line NR is formed in an equidistant offset with respect to the outlet edge, and the crease line NR and the outlet edge form an isometric bending frame, and the isometric bending frame is bent toward the center of the rotation axis L of the centrifugal impeller; the equidistant offset refers to a displacement of each point on the outlet edge along a corresponding vane profile line by a distance.