Patent ID: 11878347
Assignee: ATLAS COPCO AIRPOWER, NAAMLOZE VENNOOTSCHAP
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  C  F  Y | IPC B  F

Claim 0:
1. An impeller containing:
a central shaft or a tube for mounting on a shaft;
around the shaft or tube a hollow hub which in a direction from one end to the other end increases in diameter, said hub possessing an outside and an inside oriented towards the shaft or tube;
a back wall which is provided at an end of the hub with the largest diameter perpendicular to the shaft or tube which at least partially closes the hollow space of the hub;
a series of blades that are attached to the outside of the hub by their base;
wherein a number of flat, straight reinforcing ribs are provided which extend on the shaft or tube in an essentially radial direction and form a radial connection between the shaft or tube and the inside of the hub,
wherein the impeller is provided with at least one polygon or ring connecting all reinforcing ribs with each other and which is concentric with the central shaft or tube,
wherein said ring or polygon is provided with passages,
wherein at least one passage is always provided in a section of the ring or polygon located between two reinforcing ribs.