MULTISTAGE COMPRESSION SYSTEM

Title:

MULTISTAGE COMPRESSION SYSTEM

Document Type and Number:

WIPO Patent Application WO/2020/067194

Kind Code:

A1

Abstract:

In a refrigeration device using a plurality of multistage compressors, it has been necessary to keep refrigerating machine oil at an appropriate amount in each of the compressors. There has been a problem that when oil discharged from a compressor on a high stage is returned to the refrigerant suction side of a compressor on a low stage, heat loss and pressure loss occur and the efficiency of the system is decreased. A multistage compression system (20) has a low-stage compressor (21), a high-stage compressor (23), and an oil returning tube (31). The low-stage compressor (21) has a compression part (50), a motor (40), and a container (30). The container (30) houses the compression part (50) and the motor (40). The oil returning tube (31) is connected to a space lower than the motor (40) inside the container (30).

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Inventors:

OKAMOTO DAISUKE
TOMIOKA NAOTO
KAJIWARA MIKIO
NISHIDE YOHEI
OHNISHI YOUSUKE
ADACHI MASAAKI

Application Number:

PCT/JP2019/037669

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:

JP2008261227A	2008-10-30
JP2009079820A	2009-04-16
JP2011202817A	2011-10-13
JP2015034536A	2015-02-19
JP2007009922A	2007-01-18
JP2001272122A	2001-10-05
JP2017044420A	2017-03-02
JP2006258002A	2006-09-28
JP2008261227A	2008-10-30
JP5375534B2	2013-12-25

Other References: