(19)
(11) EP 2 390 508 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.09.2014 Bulletin 2014/39

(43) Date of publication A2:
30.11.2011 Bulletin 2011/48

(21) Application number: 11167299.4

(22) Date of filing: 24.05.2011
(51) International Patent Classification (IPC): 
F04C 18/08(2006.01)
F04C 29/12(2006.01)
 F04C 18/16(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 25.05.2010 JP 2010118883

(71) Applicant: Hitachi, Ltd.
Chiyoda-ku, Tokyo 1008280 (JP)

(72) Inventors:
  • Ishikawa, Masanori
    Tokyo 100-8220 (JP)
  • Kameya, Hirotaka
    Tokyo 100-8220 (JP)
  • Uchida, Riichi
    Tokyo 100-8220 (JP)
  • Tsuru, Seiji
    Tokyo (JP)
  • Saito, Takashi
    Tokyo (JP)

(74) Representative: Pfeiffer, Axel 
Beetz & Partner Patentanwälte Steinsdorfstrasse 10
80538 München
80538 München (DE)

   


(54) Suction opening of a screw compressor


(57) A screw compressor includes a casing (3) forming a bore (4) for accommodating a male rotor (1) and a female rotor (2) of which lobes mesh with each other, an axial suction port (11) on a suction side of the casing, and a delivery port on a delivery side, the axial suction port configured by a contour line including a line (15) along a male lobe profile and a line (18) along a female lobe profile, and the line (15) along the male lobe profile disposed at a predetermined displacement angle (Δf1) toward a rotational direction of the male rotor from a following side contour line position of a male lobe groove (5) at which position the volume of a working chamber (9) formed by the male lobe groove of the male rotor, a female lobe groove (6) of the female rotor and the bore is maximum.










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Search report