Patent ID: 6467292
Filing Date: 2002-10-22
Classification: B01D,F25B

Abstract:
A control system for compressed refrigeration dryers, of the type comprising a gas/gas exchanger (7), suitable for cooling a compressed gas mixture (M), using an outgoing gas (K) from an air condenser (8), and at least one refrigeration cycle (11), which includes an evaporator (6), where said mixture of compressed gas (M) is cooled until it reaches the desired dew point by a evaporating refrigerant, at a pre-established pressure (P1) and temperature (T2), at least one compressor (1,2) suitable for aspirating and compressing said refrigerant evaporated in the evaporator (6), a condenser (4), where the compressed gas flows, and at least one lamination unit (5), suitable for expanding said compressed gas and sending it back into the evaporator (6), said gas mixture (M) leaving said evaporator (6) carrying a quantity of condensed water vapour which is separated inside said air condenser (8) and externally discharged by means of a discharger (10), characterized in that each of said refrigeration cycles (11) comprises at least two compressors (1,2), connected in parallel with each other and each connected in series to at least one non-return valve (3), said compressors (1, 2) being further connected, by means of at least one duct (13), so that the respective zones containing lubricating oil are connected with each other, and having at least one refrigeration capacity variation system suitable for driving the contemporaneous or separate functioning of said compressors (1, 2), with the ability to control the rotation of the motor of at least one of the compressors in relation to the thermal load to be transferred to the evaporator (6).