Title:
【発明の名称】冷凍装置
Document Type and Number:
Japanese Patent JP2865707
Kind Code:
B2
Abstract:
A capacity controllable compressor apparatus has a plurality of high-pressure chamber compressors (1, 2, 3; 27, 28; 33, 34) which are connected in parallel to a common refrigerant suction pipe (10) and a common refrigerant discharge pipe (11), and oil equalizing pipes (15a, 15b; 15) through which oil sumps (1b, 2b, 3b; 27b, 28b; 33b, 34b) of the plurality of compressors are communicated with each other. One of the plurality of compressors (1, 2, 3; 27, 28; 33, 34) is operated with its chamber kept at a higher internal pressure than other compressors. The compressor apparatus comprises an oil separator (16) disposed to the common discharge pipe (11); device (17a, 17b, 17, 18, 29, 30, 32) for returning lubricating oil separated by the oil separator (16) to a suction side of one of the compressors operated with its chamber kept at a higher internal pressure; first control device (22a, 22b; 23) disposed in the oil equalizing pipes (15a, 15b; 15) so as to prevent the lubricating oil from flowing into one of the two compressors communicated with each other by the oil equalizing pipe, said one being made inoperative when the capacity of the compressor apparatus is controlled; and valve device (20a, 20b; 20; 20, 24) disposed in a discharge pipe (4, 5) of the inoperative compressor so as to prevent refrigerant from flowing into the inoperative compressor.
Inventors:
AMADA ATSUSHI
UCHIKAWA NAOSHI
KUNO HIROAKI
UCHIKAWA NAOSHI
KUNO HIROAKI
Application Number:
JP14966889A
Publication Date:
March 08, 1999
Filing Date:
June 14, 1989
Export Citation:
Assignee:
HITACHI SEISAKUSHO KK
International Classes:
F04B39/02; F04C28/08; F04C23/00; F04C29/02; F16N19/00; F25B1/00; F25B31/00; F25B5/02; (IPC1-7): F25B1/00; F04C29/02
Domestic Patent References:
| JP6287773A | ||||
| JP6273043A | ||||
| JP62288376A | ||||
| JP1131850A | ||||
| JP5979578U | ||||
| JP63101764U | ||||
| JP58102793U |
Attorney, Agent or Firm:
Katsuo Ogawa (1 person outside)