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US 2004/0105768 A1Published application
Internal recirculation for magnetically coupled positive displacement pumps
OwnerDonald B. Cameron, David Asermilyinventors
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OwnerDonald B. Cameron, David Asermilyinventors
Estimating the term…
A magnetically coupled positive displacement pump with a metallic containment can has high and low pressure port passageways through a flange of the pump which provide communication between the interior of the can and the pumping cavity of the pump to remove heat generated by eddy currents in the can. Either or both of the port passageways can be provided with a removable or otherwise adjustable orifice which allows easy modification of cooling fluid flow rate for improved heat removal to more closely meet the needs of a given application. The invention provides an orifice controlled recirculation rate through the can, easy modification to change the recirculation rate and/or adapt the pump to various fluid properties and improved recirculation performance to expand the application base of the associated pump.
In a positive displacement pump driven by a magnetic coupling including a containment can enclosing in an interior thereof a driven magnet mounted on a pump drive shaft and a driving magnet exterior of the can, the driving magnet being magnetically coupled to the driven magnet, the pump also having a high pressure port, a low pressure port and a positive displacement pumping mechanism in a pumping cavity between the ports, and having a pump flange between the driven magnet and the pumping cavity, the improvement wherein two port passageways extend through the pump flange between the interior of the containment can and the pumping cavity, at least one of said port passageways includes an orifice of an orifice size and the orifice size is adjustable.
Dependencies are inferred from the claim text.