Progressing cavity pump with constant liner thickness

Details Progressing cavity pump with constant liner thickness Progressing cavity pump with constant liner thickness

F - Mech Eng,Light,Heat,Weapons

04

C

F04C 2/107 (2006.01) F04C 5/00 (2006.01) F04C 15/00 (2006.01)

Patent

CA 2356718

The progressing cavity pump or motor stator has a generally constant liner thickness, by contrast with prior art pumps having very large liner thickness variations. The pump or motor stator is made by first coating a helicoidal mandrel with at least one liner material to define a liner of generally constant thickness; then placing the liner-coated mandrel in a housing; then placing a liquid (or liquid containing solids) intermediate material between the liner and the housing, the intermediate material being of a type which can then be solidified; then so solidifying the intermediate material to bond it to the liner and the housing; and then retracting the mandrel, leaving the liner in place bonded to the intermediate material. The liner adheres strongly to the intermediate material, but only weakly to the mandrel, such that out-rotating the mandrel readily separates it from the liner, leaving the liner in place.

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