Submergible Multistage Pump

Abstract

The invention relates to a submergible multistage pump including a drive unit having an electric motor and a drive shaft. The drive shaft extends in the axial direction, and a hydraulic unit connected to the drive unit and comprising a leading pressure stage, a trailing pressure stage and a top element connected in series. The top element includes an outlet of the multistage pump. The leading pressure stage of the hydraulic unit includes an axial inlet and an axial outlet, a circumferential housing, a circumferential internal diffuser, and an impeller connected to the drive shaft of the drive unit. The housing, the diffuser and the impeller of the leading pressure stage define a flow path from the axial inlet to the axial outlet. The diffuser is connected to the housing. The pump is characterized in that the leading pressure stage includes radial play between the housing and the diffuser in the radial direction, and abutment between the housing and the diffuser in the axial direction.

Dependencies are inferred from the claim text.