Michael A Barr

US Patent:

7062922, Jun 20, 2006

Filed:

Jan 22, 2004

Appl. No.:

10/762867

Inventors:

Carl S. Kirkconnell - Huntington Beach CA, US
Kenneth D. Price - Long Beach CA, US
Michael C. Barr - Torrance CA, US
Anthony T. Finch - Hawthorne CA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

F25B 9/00

US Classification:

62 6

Abstract:

A two-stage cryocooler () includes an ambient temperature portion (), a first-stage temperature portion (), and a second-stage temperature portion (). The ambient temperature portion includes a surge volume () that is coupled to and in communication with the first-stage temperature portion. The surge volume may be coupled to a first-stage interface () of the first-stage temperature portion by use of an inertance tube (). Locating the surge volume in the ambient temperature portion may advantageously reduce size and mass of the first-stage temperature portion. Also, thermal losses may be reduced by maintaining the surge volume at ambient temperature. Space and structural requirements for maintaining the system may be met more easily with the surge volume maintained in the ambient temperature portion of the two-stage cooler. The surge volume may be a separate unit, or may be a plenum or other chamber within an expander in the ambient temperature portion.

US Patent:

7779640, Aug 24, 2010

Filed:

Sep 9, 2005

Appl. No.:

11/223518

Inventors:

Kenneth D. Price - Long Beach CA, US
Robert C. Hon - Playa Del Rey CA, US
Julian A. Shrago - Garden Grove CA, US
Michael C. Barr - Torrance CA, US
Michael H. Kieffer - Redondo Beach CA, US
Michael J. Ramirez - Torrance CA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

F25B 9/00

US Classification:

62 6, 318128, 318122, 60520

Abstract:

Disclosed are a low vibration cryocooler and a method of reducing vibration in a cryocooler. The cryocooler can be a Stirling class cryocooler includes at least one motor that drives a mass, the motor having a main drive winding and a separate trim winding. A motor controller outputs a main drive signal that is coupled to the main drive winding and a separate vibration reducing signal that is coupled to the trim winding.

US Patent:

8490414, Jul 23, 2013

Filed:

May 16, 2007

Appl. No.:

11/803894

Inventors:

Robert C. Hon - Playa del Rey CA, US
Lowell A. Bellis - Long Beach CA, US
Cyndi H. Yoneshige - Huntington Beach CA, US
Carl S. Kirkconnell - Huntington Beach CA, US
Michael C. Barr - Torrance CA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

F28B 9/00
F01B 29/10

US Classification:

62 6, 60517, 60518, 60520, 60525

Abstract:

A thermal-cycle cryocooler, such as a Stirling-cycle cryocooler, has a single working volume that is utilized by both the compressor and the displacer. The compressor and the displacer have respective movable parts, one of which is surrounded by the other. One of the parts may be a piston, a portion of which moves within a central bore or opening in a cylinder that is the other movable part. The piston may be a component of the compressor and the cylinder may be a component of the displacer, or vice versa. The working volume is located in part in a bore of the cylinder, between the piston and a regenerator that is coupled to the cylinder. Movements of either the piston or the cylinder can directly (i. e. without the use of a gas transfer line or flow passage) cause compression or expansion of the working gas in the working volume.

US Patent:

20100313577, Dec 16, 2010

Filed:

Jun 12, 2009

Appl. No.:

12/483319

Inventors:

Carl S. Kirkconnell - Huntington Beach CA, US
Michael C. Barr - Torrance CA, US
Lowell A. Bellis - Long Beach CA, US

Assignee:

RAYTHEON COMPANY - Waltham MA

International Classification:

F25B 9/14
F25B 19/00

US Classification:

62 6, 62 511

Abstract:

A method of removing heat due to compression of a working gas from a linear cryocooler is disclosed. The cryocooler includes a sealed housing, a displacer including a displacer piston and a displacer cylinder, and a compressor all arranged within the housing. The compressor includes a compressor piston that is movable within a compression chamber. The method includes providing a port in the compression chamber to remove heat from the compression chamber due to the compression of the working gas to the housing prior to entering the displacer piston.