Inlet and outlet ports and sealing means for a fluid driven motor
AssigneeEmpire Oil Tool Company
InventorMarion A. Garrison
Life of this patent
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Abstract
An improved positive displacement motor suitable for use in downhole drilling at the end of a drill string and driven by fluid, e.g., liquid mud, under high pressures. The motor has a novel arrangement of inlet and outlet ports in longitudinally extending circumferentially spaced rows for providing fluid at a substantially uniform pressure along substantially the length of the blades driving the motor so as to equalize the driving torque along the length of the rotor and avoid pressure differentials tending to twist the blade. A continuous ring isolates the adjacent rows of inlet and outlet ports.
Claims10
In a fluid motor or pump comprising a housing having a cylindrical bore therein, a rotor of lesser radial dimension than said bore mounted coaxially for rotation in the bore and defining an annular space between the rotor and said bore, at least two longitudinally extending separator strips provided on the wall of said bore in equal circumferentially spaced relationship and dividing said annular space into a corresponding number of circumferentially spaced longitudinally extending chambers, a plurality of flexible resilient longitudinally extending blades attached to said rotor and extending outwardly therefrom to sweep said chambers, said blades being inwardly foldable to pass said separator strips, inlet port means opening through the housing to each chamber to supply fluid pressure thereto, and outlet port means opening through the housing from each chamber to discharge fluid therefrom;
- the improvement comprising locating said inlet and outlet port means in the same longitudinal location alternately in circumferentially spaced relationship about the housing and providing sealing means externally of said housing extending longitudinally between said inlet port means and said outlet port means and isolating said inlet port means from said outlet port means and from one end of said housing and isolating said outlet port means from the other end of said housing.
In a motor or pump comprising a housing having a cylindrical bore therein, a rotor mounted coaxially for rotation in said bore, inlet port means opening through said housing, and outlet port means opening through said housing and spaced circumferentially from said inlet port means;
- the improvement comprising locating said inlet and outlet port means in the same longitudinal location alternately in circumferentially spaced relationship about the housing and providing sealing means externally of said housing isolating said inlet port means from said outlet port means and from one end of said housing and isolating said outlet port means from the other end of said housing.
Dependencies are inferred from the claim text.