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Patent Searching and Data


Title:
MULTISTAGE COMPRESSION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/067196
Kind Code:
A1
Abstract:
In a refrigeration apparatus using a plurality of multistage compressors, there is a need to keep an appropriate amount of refrigerator oil in each of the compressors. A multistage compression system (20) has a low-stage compressor (21), a high-stage compressor (23), refrigerant pipes (151-156, 16), pressure reducing elements (26, 15b), and an oil drain pipe (32). The refrigerant pipes (151-156, 16) introduce, into a suction part of the high-stage compressor (23), a refrigerant that is compressed at the low-stage compressor (21) and that is discharged therefrom. The pressure reducing elements (26, 15b) are disposed at intermediate locations in the intermediate-pressure refrigerant pipes (151-156). The oil drain pipe (32) drains oil from the low-stage compressor (21). The oil drain pipe (32) connects the low-stage compressor (21) and the refrigerant pipe that is disposed at an upstream side of the pressure reducing elements (26, 15b).

Inventors:
OHNISHI YOUSUKE
ADACHI MASAAKI
KAJIWARA MIKIO
NISHIDE YOHEI
TOMIOKA NAOTO
OKAMOTO DAISUKE
UENO AKITOSHI
HORITA TAKUYA
TAKEGAMI MASAAKI
Application Number:
JP2019/037671
Publication Date:
April 02, 2020
Filing Date:
September 25, 2019
Export Citation:
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Assignee:
DAIKIN IND LTD (JP)
International Classes:
F25B1/00; F04B39/00; F04C23/00; F04C29/02; F25B1/10
Foreign References:
JP2013181736A2013-09-12
JP2008261227A2008-10-30
JPH04371759A1992-12-24
JP2012180963A2012-09-20
Attorney, Agent or Firm:
SHINJYU GLOBAL IP (South Forest Bldg, 1-4-19 Minamimori-machi, Kita-ku, Osaka-sh, Osaka 54, 〒5300054, JP)
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