Worm for an eccentric screw pump or a subsurface drilling motor
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United States of America Patent
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Apr 8, 2003
Grant Date -
N/A
app pub date -
May 11, 2001
filing date -
Nov 13, 1998
priority date (Note) -
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Abstract
A rotor (4) for an eccentric screw pump or a subsurface drilling motor consists of a straight, essentially cylindrical core element (21), onto which a shell (22) is forged by a cold-forging process. The forging gives the shell (22) the helical external form required for eccentric screw pumps (1). The rotor (4) described can be produced by non-cutting shaping, which is of considerable advantage in particular in the case of large rotor dimensions, since no waste material is produced.
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