Fluid driven pumping apparatus
AssigneeShell Oil Company
InventorPeter E. Simmons
Life of this patent
Estimating the term…
Abstract
A fluid driven pumping apparatus comprises a housing containing a twin rotor screw type positive displacement motor and a twin rotor screw type positive displacement pump. The screw rotors of said pump and motor are mounted on a pair of common shafts.
Claims24
A fluid driven pumping apparatus comprising:
- a twin rotor screw type positive displacement motor comprising:
- a driving fluid inlet;
- a driving fluid outlet;
- and
- a pair of motor screw rotors;
- a twin rotor screw type positive displacement pump having a greater fluid displacement volume than said motor, said pump comprising:
- a pumped fluid inlet in fluid communication with the driving fluid outlet;
- a pumped fluid outlet;
- and
- a pair of pump screw rotors, each having a larger tip diameter and correspondingly smaller base diameter
- than the motor screw rotors;
- an elongated housing having the driving fluid inlet substantially at one end and the pumped fluid outlet substantially at the other end and providing a chamber between said motor and said pump in the interior of the housing which forms the driving fluid outlet and at which a port opening in the housing provides fluid communication with the chamber as the pumped fluid inlet;
- and
- a pair of parallel shafts rotatably mounted in the housing, each shaft carrying one of the pump screw rotors and one of the motor screw rotors having identical pitch diameter and helix angle.
A fluid driven pumping apparatus comprising:
- a twin rotor screw type positive displacement motor comprising:
- a driving fluid inlet;
- a driving fluid outlet;
- and
- a pair of motor screw rotors;
- a twin rotor screw type positive displacement pump having a greater fluid displacement volume than said motor, said pump comprising:
- a pump fluid inlet in fluid communication with the driving fluid outlet;
- a pumped fluid outlet;
- and
- a pair of pump screw rotors, each having a larger tip diameter and correspondingly smaller base diameter than the motor screw rotors;
- an elongated housing having the driving fluid inlet substantially at one end and the pumped fluid outlet substantially at the other end and providing a chamber between said motor and said pump in the interior of the housing which forms the driving fluid outlet and at which a port opening in the housing provides fluid communication with the chamber at the pumped fluid inlet;
- and
- a pair of parallel shafts rotatably mounted in the housing, each shaft carrying one of the pump screw rotors and one of the motor screw rotors having identical pitch diamater.
A fluid driven pumping apparatus comprising a twin rotor screw type positive displacement motor having a driving fluid inlet and a driving fluid outlet, and connected to said motor a twin rotor screw type positive displacement pump having a pumped fluid inlet in communication with the driving fluid outlet and having a pumped fluid outlet, the fluid displacement volume of said pump being larger than the fluid displacement volume of said motor, the apparatus further comprising a pair of shafts rotatably mounted in a housing, each shaft carrying a screw rotor of said pump and a screw rotor of said motor.
A fluid driven pumping apparatus comprising:
- a twin rotor screw type positive displacement motor comprising:
- a driving fluid inlet;
- a driving fluid outlet;
- and
- a pair of motor screw rotors;
- a twin rotor screw type positive displacement pump having a greater fluid displacement volume than the motor, said pump comprising:
- a pumped fluid inlet in communication with the driving fluid outlet;
- a pumped fluid outlet;
- and
- a pair of pump screw rotors;
- a housing;
- and
- a pair of shafts rotatably mounted in the housing, each shaft carrying one of the pump screw rotors and one of the motor screw rotors.
A fluid driven pumping apparatus comprising a twin rotor screw type positive displacement motor having a driving fluid inlet and a driving fluid outlet, and connected to said motor a twin rotor screw type positive displacement pump having a pumped fluid inlet, a pumped fluid outlet and a greater fluid displacement volume than said motor, the apparatus further comprising a pair of shafts rotatably mounted parallel to each other in a housing, each shaft carrying a screw rotor of said pump and a screw rotor of said motor, the screw rotors of said pump and motor which are mounted on a common shaft having identical pitch diameter and helix angle and the screw rotors of said pump having a larger tip diameter and a correspondingly smaller base diameter than the screw rotors of said motor.
A fluid driven pumping apparatus comprising:
- a twin rotor screw type positive displacement motor comprising:
- a driving fluid inlet;
- a driving fluid outlet;
- and
- a pair of motor screw rotors;
- a twin rotor screw type positive displacement pump, said pump having a greater fluid displacement than the motor and comprising:
- a pumped fluid inlet;
- a pumped fluid outlet;
- and
- a pair of pump screw rotors;
- a housing;
- and
- a pair of shafts rotatably mounted in the housing, each shaft carrying one of the pump screw rotors and one of the motor screw rotors, said shafts being parallel to each other and the screw rotors of said pump and motor which are mounted on a common shaft being identical in pitch diameter and helix angle and wherein the pump screw rotors have a larger tip diameter and a correspondingly smaller base diameter than the motor screw rotors.
Dependencies are inferred from the claim text.