Centrifugal pump with twin 180 degree spiral ducts - has bush in housing as inner wall to channel from first duct to outlet common with second

摘要

The centrifugal pump with a double spiral housing (1) has each of its two spiral ducts e.g. extending over 180 deg. around the impeller (2) or around the guide vane assembly downstream of the impeller. The pump outlet is at the outer diameter of the housing which is also the diameter of the first spiral duct at the start of the second cut (4). The first duct connects to the common outlet via one or more passages (6,7) arranged to the side of the duct. The passages (6,7) are formed in the housing as channels which are open in radially inward direction and are sealed (13) by insert bushes (9) secured (12) in the housing.