Pumping arrangement
AssigneeITW Limited
InventorNigel Charles Wood
Life of this patent
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Abstract
A pumping arrangement for a paint circulation system comprising a reciprocating pump (13), and characterised by an alternating current induction motor (15), a rotary-to-linear motion converter (16) coupling the output of the induction motor (15) to a drive input of the pump (13), an alternating current frequency inverter (24a) controlling said induction motor, switch means (26) for reversing rotation of the induction motor (15) at the ends of the stroke of the reciprocating pump (13), and, a surge eliminator (28) communicating with the output side of said pump (13) to augment the pressure in the circulation system during stroke reversal of the pump.
Claims7
A pumping arrangement for a paint circulation system comprising a reciprocating pump (13), and characterised by an alternating current induction motor (15), a rotary-to-linear motion converter (16) coupling the output of the induction motor (15) to a drive input of the pump (13), an alternating current frequency inverter (24a) controlling said induction motor, switch means (26) for reversing rotation of the induction motor (15) at the ends of the stroke of the reciprocating pump (13), and, a surge eliminator (28) communicating with the output side of said pump (13) to augment the pressure in the circulation system during stroke reversal of the pump.
A pumping arrangement as claimed in any one of the preceding claims characterised in that safety switch contacts (26a) are associated with said stroke reversal switch contacts (26) so as to be actuated in the event that the pump stroke exceeds a predetermined stroke reversal point.
A pumping arrangement as claimed in any one of the preceding claims characterised by a pressure transducer (27) monitoring the pump output pressure.
A pumping arrangement as claimed in any one of the preceding claims characterised in that said pump (13) is a double acting pump in which both forward and return strokes are pumping strokes.
A pumping arrangement as claimed in any one of the preceding claims characterised by a reduction gear box (17) interposed between the motor (15) and the converter (16).
Dependencies are inferred from the claim text.