US 4,830,584 AGranted

Pump or compressor unit

OwnerFrank Mohninventor

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Abstract

A pump or compressor unit (1) suited particularly for mixed phase fluids, e.g. mixed gas and oil, has a multistage axial flow compressor device with contra-rotating vanes. An upstream mixer device (10) and a downstream centrifugal impeller device (32) can each be driven by the compressor device (21, 26, 27, 29), which may be shaped to provide a flow passage of decreasing cross-section in the flow direction. The compressor drives may be supplied by axially adjacent electric motors (24, 25) which may surround rotating sleeves (21) carrying the compressor vanes. A fluid can be circulated through the unit, e.g. for electrical insulation, and may be leaked into the pump fluid through seals, when it may contain a corrosion inhibiting agent. The unit may be arranged to be movable along a pipeline under fluid pressure to engage power supply contacts at a predetermined location.

Claims13

Dependent claims

In a fluid extraction system extracting a non-homogeneous mixture of gas and oil, a pump/compressor unit comprising:

an impeller sleeve,
a first plurality of impeller blades extending inwardly from said sleeve, and spaced apart axially thereof,
a shaft,
mounting means mounting said sleeve and said shaft with said shaft extending axially of sid sleeve with spacing therefrom to define a space therebetween,
a second plurality of impeller blades spaced apart axially of said shaft and extending outwardly therefrom in alternation with said impeller blades of said first plurality,
drive means for rotatably driving at least one of said sleeve and said shaft about the axis of said sleeve,
inlet and outlet means for conveying said mixture respectively into and out of the space between said sleeve and said shaft, at least one of said sleeve and said shaft being shaped so that the cross-sectional area of said space decreases in the direction from said inlet to said outlet means,
and a mixer sleeve, mixer elements projecting inwardly from said mixer sleeve, means mounting said mixer sleeve upstream of said impeller sleeve for rotation coaxially of said impeller sleeve, and a drive motor for causing said axial rotation.

5 more elements

Dependencies are inferred from the claim text.