Multiple rotary valve for pulse tube refrigerator
AssigneesSumitomo Heavy Industries, Ltd., c/o Sumitomo (SHI) Cryogenics of America, Inc.
InventorsMingyao XU, Eric SEITZ
Life of this patent
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Abstract
A rotary disc valve unit and refrigerators containing a rotary disc valve unit that has multiple valves, in which at least one rotary valve has ports connecting to the regenerator and at least one rotary valve has ports connecting to the warm ends of one or more pulse tubes where the rotary valve with ports for the regenerator has lighter contact than the rotary valve with ports for the pulse tubes. The valve face is divided into an inner area with ports for the pulse tubes and an outer area with ports for the regenerator, the inner area having a greater sealing pressure than the outer area.
Claims6
A multi-port rotary disc valve assembly with reduced leakage and reduced torque requirements used to control the flow from and to a regenerator and one or more pulse tubes in a pulse tube refrigerator, such assembly comprising:
- a single seat;
- and
- a valve disc situated within the single seat;
- and
- a space above a top surface of the valve disc connected to a pulse tube buffer volume;
- wherein a bottom surface of the valve disc is pressed against the single seat by a force exerted on the valve disc from a pressure Pb in the space above the top surface of the valve disc.
Dependencies are inferred from the claim text.