Document Type and Number:
Japanese Patent JPS52106805
Kind Code:
U
Abstract:
A modular multi-stage pump especially suited for pumping liquids whose external leakage may be hazardous such as liquified gases, including cryogenic fluids, which includes a fully submerged pump and motor unit preferably immersed in a suction pot and sealed with only two external static seals. The unit has a hydrostatic shaft bearing fed with pumpage that also cools the motor and flows back to the first stage discharge. The stages of the pump are in stacked relation and may be increased or decreased in number to develop a desired discharge pressure. The pump and motor unit is encased in a single sleeve casting with a plurality of longitudinal pockets spaced around the periphery thereof housing tubes carrying the pressurized fluids so that the casting is not subjected to the discharge pressure and can be very lightweight. The pump shaft extends through a hollow motor shaft and is keyed to the top end thereof, thereby eliminating a coupling.
Application Number:
JP1155277U
Publication Date:
August 15, 1977
Filing Date:
February 02, 1977
Export Citation:
International Classes:
F04D1/06; F04D7/00; F04D9/00; F04D13/06; F04D13/08; F04D29/04; F04D29/047; F04D29/049; F04D29/44; F04D29/58; (IPC1-7): F04D13/08