Refrigeration unit comprising compartments at different temperatures

A refrigeration unit comprising compartments at different temperatures, controlled by separate thermostatic devices, and cooled by a refrigerant circuit comprising a pressure-reducing capillary tube, and a single motor-compressor, characterized by the fact that it comprises a primary circuit of the type with expansion by capillary tube, with at least one evaporator functioning as an ordinary evaporator to cool at least one compartment at a higher temperature, known as the refrigerator compartment, and another evaporator forming part of a heat exchanger, to cool a compartment at a lower temperature, known as the freezer compartment, through a secondary circuit with a condenser and an evaporator, the condenser of which forms the heat exchanger with the second primary circuit evaporator, within which a refrigerant or cold-producing fluid circulates, and the evaporator of which is situated in the freezer compartment, in such a way as to produce a thermal valve effect, allowing heat to be transferred when the heat exchanger evaporator is at a lower temperature than the freezer compartment, and otherwise preventing any heat transfer, and comprises at least one device to block and release cold generation in the refrigerator compartment or compartments, the blocking state halting cooling of the refrigerator compartment or compartments, and thereby allowing cooling of the freezer compartment, while the releasing state allows cooling of the refrigerator compartment or compartments, halting cooling of the freezer compartment.