Double-yoke balanced compressor
AssigneeThe United States of America as represented by the Secretary of the Army
InventorPeter Durenec
Life of this patent
Estimating the term…
Abstract
A double-yoke balanced compressor for a cryogenic cooler that has only lir motion imparted to balanced piston and cylinder masses. A piston yoke is driven in the linear stroke direction by a piston axially offset crankshaft cam and a cylinder yoke is driven linearly by a cylinder axially offset crankshaft cam that is exactly offset 180.degree. from the other cam. A large circular bushing in the compressor housing covers the entire outer cylinder head during linear operation to prevent blow by and to guide the cylinder linearly. The lower portion of the piston and cylinder connecting rods fit into linear guides that are further comprised of low molecular weight gas filled cavities to provide additional air bearing smoothness to the linear motion of the piston and cylinder.
Claims15
In an improved closed cryogenic cooling system comprising an electric motor driven dual-reciprocating compressor which provides pressure waves of a low molecular weight working fluid to a cold finger regenerator;
- the improvement comprising:
- a compressor housing;
- a crankshaft driven by said electric motor and comprised of at least two axially offset crankshaft cams and at least two cylindrical support cams thereon wherein said at least two axially offset crankshaft cams is comprised of two diametrically axially offset crankshaft cams having axes parallel with the axis of said crankshaft and exactly offset 180.degree. from each other with one of said diametrically axially offset crankshaft cams rotating in a piston yoke race of a piston and piston connecting rod mass for imparting linear motion to said piston and with a second of said diametrically axially offset crankshaft cams rotating in a cylinder yoke race of a cylinder and cylinder connecting rod mass for imparting linear motion of said cylinder in the opposite direction from the instantaneous direction of said piston, said piston and piston connecting rod mass and said cylinder and cylinder connecting rod mass having equal weights and equal stroke distances to provide the same average mass acceleration product resulting in balanced forces in the linear direction;
- piston and cylinder air bearing and guide means for providing smooth linear motion and for eliminating lateral motion of said piston and piston connecting rod mass and said cylinder and cylinder connecting rod mass to prevent vibration and noise;
- and
- a conduit pipe and working fluid tubing in working cooperation between a compressor volume defined as the volume surrounded by the face of the piston and the surrounding inner walls of the cylinder and said cold finger generator in which said compressor housing surrounds said crankshaft, piston and cylinder, and piston and cylinder air bearing and guide means and the inner volume of said compressor housing is charged with said low molecular weight working fluid to an elevated pressure above atmospheric to provide a more efficient average pressure for said cyrogenic cooling system.
Dependencies are inferred from the claim text.