(19)
(11) EP 0 478 939 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.04.1992 Bulletin 1992/17

(43) Date of publication A2:
08.04.1992 Bulletin 1992/15

(21) Application number: 91114044.0

(22) Date of filing: 22.08.1991
(51) International Patent Classification (IPC)5F25B 1/10, F25B 31/00, F04C 29/02
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR LI LU NL SE

(30) Priority: 03.10.1990 IT 2187890 U

(71) Applicant: ING. ENEA MATTEI S.p.A.
I-20090 Vimodrone Milano (IT)

(72) Inventor:
  • Contaldi, Giulio
    I-20090 San Felice, Segrate, Milano (IT)

(74) Representative: Petruzzelli, Antonio European Patent Attorney 
C.so Italia, No. 43
20122 Milano
20122 Milano (IT)


(56) References cited: : 
   
       


    (54) Two-stage rotary compressor for refrigerating plants


    (57) A two-stage rotary compressor for refrigerating plants comprising a first low-pressure compression unit (11) and a second high-pressure compression unit (12), the rotors (13, 14) of which are connected to a single control motor (16) and in which the lubricating oil circuit comprises an intermediate oil chamber (27) connected respectively to the delivery side of the low-pressure compression unit (11) via a first oil separator (22) and to a feeding pump (17) which supplies the lubricating oil to the high-pressure compression unit (12); the oil separated from the high-pressure delivery of the second compression unit (12) in turn supplies the low-pressure compression unit (11).







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