PIPING WASHING METHOD AND PIPING WASHING APPARATUS FOR REFRIGERATING APPARATUSES

Title:

PIPING WASHING METHOD AND PIPING WASHING APPARATUS FOR REFRIGERATING APPARATUSES

Document Type and Number:

WIPO Patent Application WO/1998/044304

Kind Code:

A1

Abstract:

A closed circuit (13) is configured by connecting upper ends of existing refrigerant pipings (2A, 2B) of a refrigerant circuit with an upper connecting path (11) and lower ends thereof with a lower connecting path (12), and the closed circuit (13) is filled with a refrigerant. A separator (50) on the lower connecting path (12) heats and evaporates liquid refrigerant with a separating heat exchanger coil (52), and collects foreign matters from gaseous refrigerant with a filter (53). Two carrying heat exchangers (7A, 7B) on the lower connecting path (12) give a carrying force to the refrigerant by alternately repeating cooling action to cool the gaseous refrigerant whose phase has been changed by the separator (50) to change its phase to a liquid phase and pressuring action to heat and pressure this liquid refrigerant in a liquid phase state. The refrigerant circulates in the closed circuit (13) from the carrying heat exchangers (7A, 7B) to wash the existing refrigerant pipings (2A, 2B).

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Inventors:

UENO TAKEO (JP)
IIJIMA TOSHIHIRO (JP)
TAKEGAMI MASAAKI (JP)
YAMAMOTO MASAKI (JP)

Application Number:

PCT/JP1998/001354

Publication Date:

October 08, 1998

Filing Date:

March 25, 1998

Export Citation:

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Assignee:

DAIKIN IND LTD (JP)
UENO TAKEO (JP)
IIJIMA TOSHIHIRO (JP)
TAKEGAMI MASAAKI (JP)
YAMAMOTO MASAKI (JP)

International Classes:

B08B9/02; F25B25/00; F25B43/00; F25B47/00; F28G9/00; F25B13/00; (IPC1-7): F25B47/00; B08B9/06; F28D15/02

Domestic Patent References:

WO1997015789A1

1997-05-01

Foreign References:

JPH0783545A	1995-03-28
JPH09303908A	1997-11-28
JPH06221727A	1994-08-12
JP2593403B2	1997-03-26
JPH06207765A	1994-07-26
JPH07270000A	1995-10-20
JPS6226491A	1987-02-04

Other References: