Title:
MULTI-TYPE AIR CONDITIONER
Document Type and Number:
WIPO Patent Application WO/2008/059922
Kind Code:
A1
Abstract:
In recent years, there is known a multi-type air conditioner, which establishes a
freezing cycle by connecting a plurality of outdoor equipments as the load of a
cooling/warming operation increases. In case an outdoor equipment to be operated and
an outdoor equipment to be stopped coexist, a high-pressure liquid coolant, as
discharged from the operated outdoor equipment, flows via a liquid connecting pipe
into the stopped outdoor equipment. As a result, the quantity of a circulating coolant
in the freezing cycle may be reduced to lower the reliability of a compressor due
to an ability shortage or a discharge temperature rise of the compressor. Intended
is to suppress the reduction of the circulating coolant quantity in the multi-type
air conditioner. In the multi-type air conditioner, a plurality of outdoor
equipments (10) and a plurality of indoor equipments (40) are connected in parallel
with a liquid connecting pipe (35) and a gas connecting pipe (36), respectively,
thereby to establish the freezing cycle. The outdoor equipment (10) includes
a compressor (11) connected with a gas coolant pipe through a valve, an outdoor
heat exchanger (14) connected with that compressor, a receiver (25) connected
with that outdoor heat exchanger, and an automatic switch valve (23) interposed
between that receiver and a liquid coolant pipe. The outdoor equipment is controlled
such that the automatic switch valve (23) is closed when the operation is stopped.
Even if the outdoor equipment to be operated and the outdoor equipment to be stopped
coexist, therefore, the coolant is not accumulated in the receiver of the outdoor
equipment to be stopped, so that the reduction in the circulating coolant quantity
can be suppressed.
Inventors:
NAITO KOJI (JP)
NAKAMURA KENICHI (JP)
URATA KAZUMOTO (JP)
NAGAMATSU SHINICHIRO (JP)
NAKAMURA KENICHI (JP)
URATA KAZUMOTO (JP)
NAGAMATSU SHINICHIRO (JP)
Application Number:
PCT/JP2007/072184
Publication Date:
May 22, 2008
Filing Date:
November 15, 2007
Export Citation:
Assignee:
HITACHI APPLIANCES INC (JP)
NAITO KOJI (JP)
NAKAMURA KENICHI (JP)
URATA KAZUMOTO (JP)
NAGAMATSU SHINICHIRO (JP)
NAITO KOJI (JP)
NAKAMURA KENICHI (JP)
URATA KAZUMOTO (JP)
NAGAMATSU SHINICHIRO (JP)
International Classes:
F25B1/00; F24F11/02; F25B13/00
Foreign References:
| JP2004170047A | 2004-06-17 | |||
| JPH1047808A | 1998-02-20 |
Attorney, Agent or Firm:
Polaire I.P.C. (Chuo-ku Tokyo, 32, JP)
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