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(11) | EP 1 830 143 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Refrigeration cycle apparatus |
| (57) In a refrigeration cycle apparatus having an expansion mechanism whose number of
revolutions can be changed independently from the number of revolutions of a compressing
mechanism, it is an object of the invention to adjust a circulation amount of a refrigerant
flowing into the expansion mechanism in a wider range without deteriorating the reliability
of the expansion mechanism, and to operate the refrigeration cycle apparatus efficiently.
The refrigeration cycle apparatus comprises a compressing mechanism 2, a heat source-side
heat exchanger 6, an expansion mechanism 5 which collects power and has the number
of revolutions that can be changed independently from the number of revolutions of
the compressing mechanism 2, a utilizing-side heat exchanger 3, and a pre-expansion
valve 11 for decompressing a refrigerant flowing into the expansion mechanism 5. With
this refrigeration cycle apparatus, when the high pressure-side pressure can not be
adjusted to a preferable pressure without bringing the number of revolutions of the
expansion mechanism 5 out from its using range, the high pressure-side pressure can
be adjusted by operating an opening of the pre-decompressor. Therefore, the refrigeration
cycle apparatus can be operated efficiently without deteriorating the reliability
of the expansion mechanism.
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