FREEZE CYCLING DEVICE

WIPO Patent Application WO/2010/021137

A1

The freeze cycling device (100A) is provided with a first compressor (101) that is an integrated expander compressor, a second compressor (102) and a control device (300). When the oil surface (S1) of the first oil bank (13) becomes lower than a prescribed level (L), the control device (300) reduces the rotation speed of the first electric motor (11) by a prescribed amount and increases the rotation speed of the second electric motor (12) by a prescribed amount. It also switches to oil-leveling operation that increases the opening of the bypass valve (70) so that the pressure or temperature of the discharged refrigerant that is led to the radiator (4) through the first tubing (3a) is kept approximately-constant and after a prescribed period elapses after the oil-leveling operation is started, it returns the rotation speeds of the first electric motor (11) and second electric motor (12) and the opening of the bypass valve (70) to the states before the oil-leveling operation was started.

OGATA TAKESHI
TAKAHASHI YASUFUMI
MATSUI MASARU
WADA MASANOBU
HIKICHI TAKUMI

PCT/JP2009/003978

February 25, 2010

August 20, 2009

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PANASONIC CORP (JP)
OGATA TAKESHI
TAKAHASHI YASUFUMI
MATSUI MASARU
WADA MASANOBU
HIKICHI TAKUMI

F25B1/00; F25B11/02

WO2007000854A1	2007-01-04
WO2007032337A1	2007-03-22

JP2004212006A	2004-07-29
JPH01203848A	1989-08-16
JP2006266653A	2006-10-05
JPH05296583A	1993-11-09
JP2005241070A	2005-09-08
JPH0755269A	1995-03-03
JP2004212006A	2004-07-29

KAMADA, Koichi et al. (JP)
Koichi Kamata (JP)

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