Electrically-driven rotary pump
AssigneeRena GmbH
InventorsJacques Point, Pierre Joulia
Life of this patent
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Abstract
A centrifugal pump, intended for pumping liquids, includes a impeller (1) connected in rotation to a rotor (7) with a permanent magnet that is part of a synchronous motor. The rotor (7) which has an axial clearance (L) is accommodated in a cylindrical housing (10) that is part of the body (9) of stator (8) of the motor. To orient the drive direction (F) of rotor (7) on the starting of the pump, complementary configurations are provided on the front face of rotor (7) away from impeller (1) and at the bottom of housing (10). These configurations comprise helicoidal surfaces (14, 16) connected at their ends by notches (15, 17).
Claims4
In an electrically-driven rotary centrifugal pump, for pumping liquids, comprising a impeller (1) connected in rotation to a rotor (7) having a permanent magnet that is part of a synchronous electric motor, whose stator (8) has a body (9) having a generally-cylindrical central housing (10) accommodating rotor (7), the improvement comprising:
- means to orient drive direction (F) of said rotor (7) on starting the pump said means comprising complimentary configurations on the front face of rotor (7) away from impeller (1) and turned towards the bottom of housing (10) accommodating said rotor (7) and on the bottom of said housing (10), said complementary configurations comprising at least one helicoidal surface (14, 16) and at least one notch (15, 17) connecting the helicoidal surface ends, rotor (7) having an axial clearance (L).
Dependencies are inferred from the claim text.