Refrigeration – Automatic control – Diverse – cascade or compound refrigeration-producing system
Reexamination Certificate
2006-08-29
2006-08-29
Norman, Marc (Department: 3744)
Refrigeration
Automatic control
Diverse, cascade or compound refrigeration-producing system
C062S228100, C062S230000, C062S510000, C417S002000, C417S044100, C417S045000
Reexamination Certificate
active
07096681
ABSTRACT:
A system and method are provided for variable speed operation of a screw compressor to obtain increased capacity and efficiency. The screw compressor is connected to an induction motor driven by a variable speed drive, wherein the screw compressor has a variable output capacity that is dependent on the output speed of the motor. To obtain increased capacity and efficiency, the screw compressor is operated at a speed greater than the screw compressor's rated speed and does not include a slide valve. The maximum operating speed of the screw compressor, which speed is greater than the rated speed, is related to the maximum operating speed of the motor when operated at a voltage and frequency provided by the variable speed drive that is greater than the motor's rated voltage and frequency in a constant flux or constant volts/Hz mode.
REFERENCES:
patent: 3390320 (1968-06-01), Kammiller et al.
patent: 3621365 (1971-11-01), Beck et al.
patent: 3909687 (1975-09-01), Abbondanti
patent: 4150425 (1979-04-01), Nagano et al.
patent: 4151725 (1979-05-01), Kountz et al.
patent: 4152902 (1979-05-01), Lush
patent: 4492546 (1985-01-01), Hartwig et al.
patent: 4546423 (1985-10-01), Seki
patent: 4656571 (1987-04-01), Umezu et al.
patent: 4787211 (1988-11-01), Shaw
patent: 4879639 (1989-11-01), Tsukahara et al.
patent: 4958118 (1990-09-01), Pottebaum
patent: 5010287 (1991-04-01), Mukai et al.
patent: 5350992 (1994-09-01), Colter
patent: 5446645 (1995-08-01), Shirahama et al.
patent: 5488279 (1996-01-01), Kawamoto et al.
patent: 5492273 (1996-02-01), Shah
patent: 5503248 (1996-04-01), Peruggi et al.
patent: 5509504 (1996-04-01), McHugh et al.
patent: 5528114 (1996-06-01), Tokizaki et al.
patent: 5845509 (1998-12-01), Shaw et al.
patent: 6008616 (1999-12-01), Nagayama et al.
patent: 6018957 (2000-02-01), Katra et al.
patent: 6031738 (2000-02-01), Lipo et al.
patent: 6124697 (2000-09-01), Wilkerson
patent: 6185946 (2001-02-01), Hartman
patent: 6229722 (2001-05-01), Ichikawa et al.
patent: 6325142 (2001-12-01), Bosley et al.
patent: 6370888 (2002-04-01), Grabon
patent: 6408645 (2002-06-01), Tsuboe et al.
patent: 6434960 (2002-08-01), Rousseau
patent: 6459596 (2002-10-01), Corzine
patent: 6459606 (2002-10-01), Jadric
patent: 6579067 (2003-06-01), Holden
patent: 2003/0041605 (2003-03-01), Butcher et al.
patent: 2003/0098668 (2003-05-01), Jadric et al.
patent: 100 03 869 (2001-08-01), None
patent: 1004 7629 (2002-04-01), None
patent: 0 695 024 (1996-01-01), None
patent: 704 784 (1996-04-01), None
patent: 1 022 844 (2000-07-01), None
patent: 1 055 885 (2000-11-01), None
patent: 1579045 (1980-11-01), None
patent: 57 018484 (1982-05-01), None
patent: 60102878 (1985-06-01), None
patent: WO 97/18420 (1997-05-01), None
patent: WO 03/044939 (2003-05-01), None
Murphy, J.M.D., “Thyristor Control of A.C. Motors”, Principles of Variable-Frequency A.C. Drives, Oct. 10, 1975, pp. 3-4, 111-114, & 120-121, Pergamon Press, New York.
Federman Israel
Judge John F.
Kester Douglas Alan
Schnetzka Harold Robert
Valiya-Naduvath Mahesh
McNees Wallace & Nurick LLC
Norman Marc
York International Corporation
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