Refrigeration apparatus

摘要

A refrigeration apparatus includes a multistage compression mechanism, switching mechanisms, intercoolers, oil separators, and a control unit. The multistage compression mechanism has one high-stage-side compression mechanism and a plurality of low-stage-side compression mechanisms connected in series. The switching mechanisms are connected to blow-out pipes of the low-stage-side compression mechanisms. The switching mechanisms switch between cooling and heating operation cycles. The intercoolers cool refrigerant blown out from the low-stage-side compression mechanisms during the cooling cycle. The oil separators are disposed between the switching mechanisms and the intercoolers. The oil separators separate lubricating oil from refrigerant blown out from the low-stage-side compression mechanisms during the cooling cycle. The control unit controls the multi-stage compression mechanism and the switching mechanisms. Refrigerant from the low-stage-side compression mechanisms passes through the oil separators and intercoolers during the cooling cycle, not during the heating cycle.

主权项

1. A refrigeration apparatus, comprising:
a multistage compression mechanism having one high-stage-side compression mechanism and a plurality of low-stage-side compression mechanisms connected in series; switching mechanisms connected to blow-out pipes of the low-stage-side compression mechanisms, the switching mechanisms being configured to switch between a cooling operation cycle and a heating operation cycle; intercoolers configured to cool refrigerant blown out from the low-stage-side compression mechanisms during the cooling operation cycle; low-stage-side oil separators disposed between the switching mechanisms and the intercoolers, the low-stage-side oil separators being configured to separate a lubricating oil from the refrigerant blown out from the low-stage-side compression mechanisms during the cooling operation cycle; and a control unit configured to control the multistage compression mechanism and the switching mechanisms, during the cooling operation cycle, the refrigerant blown out from each of the low-stage-side compression mechanisms passing through one of the low-stage-side oil separators and one of the intercoolers before being taken into another of the low-stage-side compression mechanisms or the high-stage-side compression mechanism; and during the heating operation cycle, the refrigerant blown out from each of the low-stage-side compression mechanisms not passing through one of the low-stage-side oil separators and one of the intercoolers before being taken into another of the low-stage-side compression mechanisms or the high-stage-side compression mechanism.