초록 ▼

An NMR DOR sample spinner includes an inner-rotor that is driven by a radial-inflow microturbine at each end, supported radially by anti-whirl air bearings, and supported axially by thrust bearings at each end thereof. The DOR spinner further comprises an outer-rotor that houses the inner-rotor bear

An NMR DOR sample spinner includes an inner-rotor that is driven by a radial-inflow microturbine at each end, supported radially by anti-whirl air bearings, and supported axially by thrust bearings at each end thereof. The DOR spinner further comprises an outer-rotor that houses the inner-rotor bearing and drive nozzles such that the inner-rotor axis is inclined with respect to the axis of the outer-rotor at an angle of typically 30.56°. The outer-rotor is driven by a radial-inflow microturbine at each end, supported radially on anti-whirl air bearings, and supported axially by thrust bearings at each end thereof. The outer-rotor further comprises ceramic bearing races at each end that hold the sample drive nozzles in place. The outer microturbines are screwed to the outer-rotor and hold the bearing races in place. Drive and bearing gas for the inner-rotor is supplied through slip-fit, precision axial tubes at each end of the outer-rotor. The rf magnetization coil surrounds the central region of the outer-rotor, and rf shield rings limit the axial extent of the rf magnetic field.

대표청구항 ▼

A DOR NMR sample spinner for simultaneous rotation of a sample about second and first axes in an external magnetic field comprising: an outer-rotor having a second axis of static balance, said outer-rotor being asymmetric about said second axis, said outer-rotor containing an inner-rotor; an outer s

A DOR NMR sample spinner for simultaneous rotation of a sample about second and first axes in an external magnetic field comprising: an outer-rotor having a second axis of static balance, said outer-rotor being asymmetric about said second axis, said outer-rotor containing an inner-rotor; an outer stator including gas bearings for support of said outer-rotor, drive nozzles to effect rotation of said outer-rotor, a gas distribution manifold, and an rf magnetization coil surrounding said outer-rotor; said outer-rotor comprising: outer-rotor drive means at one end of said outer-rotor; a cylindrical outer-rotor body having a rotational axis coincident with said second axis and having a round through-hole defining a first axis which intersects said second axis at an acute angle; an inner bearing sleeve in said through-hole and two inner-rotor drive stator caps at respective ends of said through-hole, each with an outside diameter essentially equal to that of said through-hole; an axial inlet port in said outer-rotor body for supplying pressurized gas to said inner bearing sleeve and stator caps; an outer bearing race disposed over the outside of each end of said outer-rotor body so as to position and constrain said stator caps; an outlet port in said outer-rotor body for venting gas from the central region of said inner bearing sleeve; dynamic balance means such that the dynamic balance axis of said outer-rotor lies within 20 microns of said second axis when said outer-rotor is assembled; said inner-rotor being substantially reflectionally symmetric about a plane containing its center of mass and perpendicular to its rotational axis, said inner rotor being substantially rotationally symmetric about its geometric axis, said geometric axis .being coincident with said first axis during operation; said inner-rotor further characterized in that it includes microturbine blades and two opposed thrust bearing annuli; said inner stator caps including inner-rotor drive nozzles to cooperate with said microturbine blades, and including thrust bearing annular lands to cooperate with said bearing annuli for rotation and centering of said inner-rotor, such that the center of mass of said inner-rotor lies on the rotational axis of said outer-rotor.