Mechanical refrigeration system

Mechanical refrigeration system comprising:

• a closed circuit for a coolant fluid, comprising:
• a compressor device connected to
• a capacitor configured to extract part of the heat generated in the compressor device, the capacitor comprising an outlet,
• an expansion valve being disposed at the outlet of the capacitor configured to low the pressure of the coolant fluid,
• an evaporator configured to evaporate the coolant fluid and generate cold, wherein the evaporator is communicated in a closed circuit with the compressor device, and wherein the compressor device comprises a pair of dual-action cylinders, a first dual-action cylinder and a second dual-action cylinder, connected together by a movable rod thereof which is common for both dual-action cylinders, such that the first dual-action cylinder compresses the coolant fluid, and having at each of two intakes, acting as both inlets and outlets, respective pairs of branches which are connected in series to the closed circuit, and
• wherein the second dual-action cylinder comprises two intakes, corresponding to each of two working chambers, each of which is connected to a branch in each of which there is established an opening/closing valve that is a first valve, a second valve, a third valve and a fourth valve, there being two-by-two communication between opposite branches, at which communication point there is established a pressurized water inlet and an outlet for said water, respectively, with the particularity that the opening and closing of the first valve and the third valve is mechanically synchronised, inversely with respect to the second valve and the fourth valve, there having been provided that in correspondence with the movable rod common to both dual-action cylinders there is established an actuator mechanically associated in limit switches thereof, the actuator comprising an inverter configured to invert the position of the opening/closing valves.