(19)
(11) EP 2 025 939 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.08.2010 Bulletin 2010/32

(43) Date of publication A2:
18.02.2009 Bulletin 2009/08

(21) Application number: 08252231.9

(22) Date of filing: 28.06.2008
(51) International Patent Classification (IPC): 
F04C 18/02(2006.01)
F04C 28/10(2006.01)
 F04C 28/26(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA MK RS

(30) Priority: 03.08.2007 US 833342

(71) Applicant: Scroll Technologies
Arkadelphia, AR 71923 (US)

(72) Inventor:
  • Sun, Zili
    Arkadelphia Arkansas 71923 (US)

(74) Representative: Shanks, Andrew et al
Marks & Clerk LLP Aurora 120 Bothwell Street
Glasgow G2 7JS
Glasgow G2 7JS (GB)

   


(54) Stepped scroll compressor with staged capacity modulation


(57) A scroll compressor has a stepped wrap such that there is a greater height outer portion (38;40) and a lesser height more central portion (42;44). Bypass ports (36) are associated with the transition zone between the higher and lesser height portions. By providing the bypass port in a stepped scroll compressor, greater reductions in capacity can be achieved than have been provided in the prior art.







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