Worm for an eccentric screw pump or a subsurface drilling motor
AssigneeWilhelm Kaechele GmbH Elastomertechnik
InventorBruno Kaechele
Life of this patent
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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.
Claims28
Rotor (4) for an eccentric screw pump (1) or an eccentric screw motor (51), which pump or motor has a stator (3) having a continuous interior space (12), into which strips project radially and in which the rotor (4) is arranged, having an essentially cylindrical core element (21), having an outer shell (22) which forms a helically formed outer surface (29) and surrounds the core element (21) essentially over its entire length, and the outer surface of which has thread valleys (34) and thread crests (33), the shell (22) being connected to the core element (21) by a cylindrical tube which forms the shell (22), being formed by shaping it into a helical tube until the shell bears with its inner circumferential surface in the region of the thread valleys against the core element and being frictionally connected to the core element (21) in the region of at least one thread valley, and having a coupling head (23) which is connected to the rotor (4) in a rotationally locked manner.
Dependencies are inferred from the claim text.