Title:
AIR CONDITIONER
Document Type and Number:
WIPO Patent Application WO/2007/069625
Kind Code:
A1
Abstract:
Prediction error in quantity of refrigerant due to difference in solubility
of refrigerant into oil is minimized by sustaining the same distribution condition
of refrigerating machine oil in the cycle during each operation of judging the
quantity of refrigerant. The air conditioner (1) comprises a refrigerant circuit
(7), and operation controllers (6a-6c). The refrigerant circuit includes heat
source units (2a-2c), refrigerant communication pipings (4, 5), expansion
mechanisms (29a-29c, 31a, 31b, ...), and utilization units (3a, 3b, ...). The
heat source unit has compression mechanisms (21a-21c) and heat source side heat
exchangers (24a-24c). The refrigerant communication piping is connected with
the heat source units. The utilization unit has utilization side heat exchangers
(32a, 32b, ...) and connected with the refrigerant communication pipings. When
operation for judging the quantity of refrigerant in the refrigerant circuit
is performed, the operation controller performs an operation for returning
oil staying in the refrigerant circuit.
Inventors:
NISHIMURA TADAFUMI (JP)
KASAHARA SHINICHI (JP)
KASAHARA SHINICHI (JP)
Application Number:
PCT/JP2006/324807
Publication Date:
June 21, 2007
Filing Date:
December 13, 2006
Export Citation:
Assignee:
DAIKIN IND LTD (JP)
NISHIMURA TADAFUMI (JP)
KASAHARA SHINICHI (JP)
NISHIMURA TADAFUMI (JP)
KASAHARA SHINICHI (JP)
International Classes:
F25B49/02; F25B1/00; F25B13/00
Foreign References:
| JP2004218849A | 2004-08-05 | |||
| JPH0721374B2 | 1995-03-08 |
Other References:
See also references of EP 1965159A4
Attorney, Agent or Firm:
ONO, Yukio et al. (South Forest Bldg. 1-4-19, Minamimori-machi, Kita-ku, Osaka-sh, Osaka 54, JP)
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