Patent ID: 8939720
Filing Date: 2015-01-27
Classification: F04D

Abstract:
1. A volute shaped pump casing for a centrifugal pump, including a chamber for housing at least one impeller mounted on a shaft for rotating the impeller around an axis of rotation, a volute shaped chamber which forms a flow channel divided into a first volute and a second volute, and a first channel and a second channel connected to the first and the second volute respectively, with the first channel being called long channel and the second channel being called short channel, characterized in that the first or long channel is axially displaced with respect to the second or short channel and/or with respect to the second volute, wherein the first or longer channel has a wall closer to the axis of rotation called inner wall, and wherein a radial distance between the axis of rotation and the inner wall decreases over at least a part of the length of the long channel.