Patent ID: 8627676

Claim:
A flow rate control system in refrigeration circuits, the circuit comprising a hermetic variable capacity compressor fluidly connected to a closed circuit, the hermetic variable capacity compressor having an electronic system to control the compressor, the closed circuit comprising a condenser, an evaporator, a heat exchanger, a suction line and a fluid expansion valve; a flow rate control valve positioned between an outlet of the condenser and before an inlet of the fluid expansion valve; the condenser being connected from the outlet of the hermetic variable capacity compressor in series with the expansion valve, with the heat exchanger and with the evaporator, the suction line being connected to the outlet of the evaporator which passes through the heat exchanger to the inlet of the hermetic variable capacity compressor; the fluid expansion valve having a nominal expansion capacity and being positioned between the evaporator and the condenser, the hermetic variable capacity compressor promoting a fluid flow inside the closed circuit, the closed circuit having a circuit nominal flow rate capacity, the flow rate control system wherein the electronic system of the hermetic variable capacity compressor is configured to control the flow rate control valve, to always maintain the fluid passing through the fluid expansion device at the same level as the nominal expansion capacity of the fluid expansion device, pulsating the flow rate control valve proportionally to the speed of the hermetic variable capacity compressor so that the fluid is dammed in the condenser and released when it has reached an amount substantially equal to the nominal expansion capacity.