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US 3,938,744 AGranted
Positive displacement rotary pump and drive coupling therefor
OwnerClifford Harry Alleninventor
Life of this patent
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OwnerClifford Harry Alleninventor
Estimating the term…
A progressing cavity, positive displacement rotary pump assembly for fluid or semi-fluid material. The assembly includes a rotary shaft with an associated drive motor and pump components including a tubular stator with an interior helical surface and an orbital rotor within the stator operably connected to the shaft and having an exterior helical surface. The helical rotor surface has one more thread than the helical stator surface which it engages, to define sealed pumping cavities that advance axially as the rotor rotates and orbits within the stator. The rotor is coupled to the shaft by a flexible torque tube with one end connected to the shaft and the other connected to an end of the rotor to transmit driving torque to the rotor and to flex sufficiently to accommodate orbital movement of the rotor.
In a progressing-cavity, positive displacement rotary pump assembly including a rotary shaft and drive means therefor, a generally tubular stator coaxial with said rotary shaft and having a helically formed interior surface with n-1 threads, a rotor located within said stator and having a helically formed exterior surface engaging said interior surface of said stator to define therewith, sealed pumping cavities, said exterior rotor surface having n threads and a lead of n times the lead of said interior stator surface, the improvement which comprises:
A submersible grinder pump for comminuting and pumping semi-fluid material from a reservoir, comprising:
In a progressing-cavity, positive displacement rotary pump assembly including a rotary shaft and drive means therefor, a generally tubular stator coaxial with said rotary shaft and having a helically formed interior surface, a rotor located within said stator and having a helically formed exterior surface engaging said interior surface of said stator to define therewith sealed pumping cavities, the improvement which comprises:
Dependencies are inferred from the claim text.