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US 4,990,068 AGranted
Unique grease lubricated ball bearing canned motor pump
OwnerXing X. Zhong, Yu Z. Zhaoinventors
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OwnerXing X. Zhong, Yu Z. Zhaoinventors
Estimating the term…
The present invention relates to a sealed centrifugal pump used for delivering special liquids and that overcomes the limitations of well-known canned or sealed motor pumps, including relatively short service life of the bearings and unsuitability for delivering liquids or fluids containing tiny particles or contaminents by means of a new type of structure in which the bearings, which are working in liquid phase, are isolated from the pumped fluid medium. This enables ball bearings to be used as the support of the canned motor, the use of lubricating oil and grease for the ball bearings, and the forced cooling of the lubricant and bearings other than by the pumped fluid, so that the service life of the whole pump unit has been increased, and the delivery of liquids containing tiny particles is enabled.
In a canned or sealed centrifugal motor pump for pumping fluid from an inlet to an outlet and having a pump housing containing a fluid impeller and a motor having a coaxially mounted stator and an inner hollow rotor, the combination of an inner shaft passing axially through the rotor and mounting the same by upper and lower ball-bearing means disposed in chambers within the upper and lower ends of the hollow rotor, the rotor being closed at its lower end adjacent said impeller and open at its upper end;
In a canned or sealed centrifugal motor pump for pumping fluid from an inlet to an outlet having a pump housing containing a fluid impeller and a motor having a coaxially mounted stator and an inner hollow rotor, the combination of an inner shaft passing axially through the rotor and mounting the same by upper and lower ball-bearing means disposed in chambers within the upper and lower ends of the hollow rotor, the rotor being closed at its lower end adjacent said impeller and open at its upper end;
In a canned fluid delivery motor pump including a pump casing containing a pump impeller, a motor stator and a hollow rotor, a pump sealing ring between the impeller and its pump suction inlet and the chamber of the stator, and in which means comprising non-magnetic corrosion-resistant metallic shield-cans are provided isolating the stator and rotor from the delivered fluid medium, the combination of a cup mounted inverted on the upper end of the stator on top of the hollow rotor by a coaxial three-tube vertical shaft;
Dependencies are inferred from the claim text.