Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
1997-09-25
2001-07-10
Vrablik, John J. (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S150000
Reexamination Certificate
active
06257851
ABSTRACT:
BACKGROUND OF THE INVENTION
Conventional scroll compressors are designed around involutes of circles. Such designs are inherently eccentric in shape and present disadvantages in minimizing the size of the compressor since an enclosed diameter which is drawn on center with the wrap will necessarily include some unused space in the outer periphery. U.S. Pat. No. 5,318,424, issued on Jun. 7, 1994, addresses a design for scroll components that presents an outer wrap geometry that increases the displacement of a scroll compressor over that of a conventional involute of a circle. The specific method taught in that patent uses the combination of an arc of a circle at the outer most periphery which is blended through a high order curve to an involute of a circle scroll form in the inner wraps. While this design has been found to be effective, additional scroll designs intended to minimize the external dimensions of the scroll components while maximizing the compressed volume thereof are desirable.
SUMMARY OF THE INVENTION
A scroll element is provided for use in a scroll machine wherein the scroll element has a wrap surface extending from an outer point to an inner point and includes a low value for the generating radius for at least the outer portion of the wrap surface and a high value for the generating radius for at least the inner portion of the wrap surface without using, in sequence, from the outer portion to the inner portion, a segment of a circle, a high order curve and an involute.
In accordance with another aspect of the present invention, the low generating radius value can be an absolute or a mean value and the high value of generating radius can be either an absolute or mean value. It is an object of this invention to define the general requirements needed to increase scroll compressor displacement over that of conventional or offset wraps without introducing some of the attendant difficulties of these designs.
In accordance with another aspect of the present invention, the first pocket of a dual pocket scroll machine is designed with a wrap surface extending from an outer point to an inner point and includes a low value for the generating radius for at least the outer portion of the wrap surface and a high value for the generating radius for at least the inner portion of the wrap surface. In accordance with another aspect, both pockets of the dual pocket scroll machine are formed this way.
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Beagle Wayne P.
Bush James W.
Housman Mark E.
Carlson & Gaskey & Olds
Scroll Technologies
Vrablik John J.
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