APPARATUS AND METHOD FOR CLEANING PIPES OF REFRIGERATING UNIT

WIPO Patent Application WO/1999/013279

A1

An apparatus for cleaning pipes, wherein a four-way changeover valve (43) in a heat pump circuit (200) is switched to operate two transfer heat exchangers (25, 26) alternately as a cooler and heater, and to thereby circulate a cleaning refrigerant in a cleaning circuit (2) through a gas line (3) and a liquid line (5), a solenoid valve (SV3) being opened, when the amount of the cleaning refrigerant runs short during a cleaning operation by the circulation of the cleaning refrigerant, to replenish the refrigerant in a refrigerant cylinder (71) from a refrigerant makeup line (72) to either the transfer heat exchanger (25) or the transfer heat exchanger (26) which is in a cooling operation, a solenoid valve (SV4) being opened, when the cleaning refrigerant is excessive, to return the cleaning refrigerant from a refrigerant extraction line (73) to the refrigerant cylinder (71), whereby the amount of the cleaning refrigerant can be maintained at a suitable level.

JP2643104	SYNTHETIC FLUSHING OIL FOR REFRIGERATION SYSTEM
JP7106030	Refrigerant recovery system and refrigerant recovery method
JPH06180163	METHOD FOR REPLACING REFRIGERANT OF FREEZER

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

PCT/JP1998/004020

March 18, 1999

September 08, 1998

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

F25B45/00; F25B47/00; F28G9/00; (IPC1-7): F25B47/00; F28G9/00

WO1997015789A1

1997-05-01

JPH07127953A	1995-05-19
JPH06221727A	1994-08-12
JPH04254173A	1992-09-09
JPH05280839A	1993-10-29
JPH07243723A	1995-09-19
JPH08303909A	1996-11-22

See also references of EP 1022524A4

Aoyama, Tamotsu (Shiromi 1-chome Chuo-ku, Osaka-shi Osaka, JP)

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