The invention provides a refrigerating
system. The refrigerating
system comprises a compressor (1), an
evaporation device and a condensation device; the compressor comprises more than two compressioncavities and further comprises more than one switching compression cavity, more than one air supplement port and more than one air supplement
branch (10), wherein the compression cavities are independent from each other, and the air supplement branches (10) are located outside the compressor; the air supplement ports can be connected to at least one of the air supplement branches (10); the air suction ends of the switching compression cavities are connected to the air supplement ports; and the exhaust ends of the switching compression cavities are connected to an exhaust port of the compressor. Compared with an original two-stage or quasi-two-stage air supplement
enthalpy increasing
system loop, the refrigerating system has the beneficial effects that a technology combining air supplemententhalpy increasing and
parallel compression is adopted, air supplement
enthalpy increasing can be realized by utilizing the air supplement branches, the mixing loss of air supplement can be effectively reduced, the
backflow loss and the flowing resistance loss of air supplement can be reduced, and therefore the air supplement
enthalpy increasing effect can be improved, the heating capacity of therefrigerating system at a low temperature can be improved, and the energy efficiency level of the system can be improved.