|
(11) | EP 0 478 939 A3 |
(12) | EUROPEAN PATENT APPLICATION |
|
|
|
|
|||||||||||||||||||||||||||
(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). |