DEVICE FOR REGULATING THE PRESSURE AND/OR TEMPERATURE OF THE REFRIGERANT FLUID ENTERING A COMPRESSOR OF A REFRIGERATION APPARATUS, RESPECTIVE REFRIGERATION APPARATUS AND METHOD FOR OPERATING SAID REGULATION DEVICE
Device for regulating (1) the pressure and/or temperature of the refrigerant fluid entering a compressor (101) of a refrigeration apparatus (100)) having a closed circuit (C) within which a flow rate (P) of refrigerant fluid whose pressure and/or temperature has to be regulated, circulates, a cooling device (102) and an evaporator (103), said regulation device (1) comprising at least one reciprocating compressor (2) equipped with at least one cylinder (7), at least one rod (8), at least one first piston (9a) integrally constrained to said rod and able to be translated within said cylinder, said cylinder (7) being equipped with a first chamber (10) comprising a first port (11) for the suction inflow of a first flow rate of said refrigerant fluid coming from said evaporator and a second port (12) for the outflow of said first flow rate of compressed refrigerant fluid contained in said first chamber (10) and intended to reach said compressor (101), said cylinder (7) further comprising a second chamber (20), which is fluidically separated from said first chamber by said first piston (9a) and equipped with at least one third port (21) for the inflow of a second flow rate (X2) of said refrigerant fluid to displace said piston and compress said refrigerant fluid contained in said first chamber (10), said regulation device (1) further comprising control means (50) for controlling the actuation of said at least one rod (8), which are adapted to divert said at least one second flow rate of said refrigerant fluid for controlling the displacement of said at least one first piston (9a) and compressing the refrigerant fluid of said first flow rate, which is contained in said first chamber, and to re-enter said second flow rate of refrigerant fluid into said closed circuit during the displacement of said at least one first piston (9a) during the step of suctioning said first flow rate of refrigerant fluid, characterised in that said control means (50) comprise a valve (51) equipped with an inlet line (51a) and an outlet line (51b) for said second flow rate, and at least one first passage (52a) through said valve, said valve being rotatable in such a way as to assume at least one first radial position (P1) in which the fluidic communication between said inlet line (51a) to said rotary valve (51) and said at least one second chamber (20) is allowed through said at least one first passage (52a), for the inflow of said second flow rate into said second chamber (20) and the compression of said first flow rate contained in said at least one first chamber (10), and at least one second radial position (P2) in which the fluidic communication between said at least one second chamber (20) and said outlet line (51b) of said rotary valve (51), for the suction of refrigerant fluid within said at least one first chamber (10), is allowed through said at least one passage (52a).
F25B 41/20 - Disposition of valves, e.g. of on-off valves or flow control valves
F25B 49/02 - Arrangement or mounting of control or safety devices for compression type machines, plants or systems
2.
DEVICE FOR REGULATING THE PRESSURE AND/OR TEMPERATURE OF THE REFRIGERANT FLUID ENTERING A COMPRESSOR OF A REFRIGERATION APPARATUS, RESPECTIVE REFRIGERATION APPARATUS AND METHOD FOR OPERATING SAID REGULATION DEVICE
Device for regulating (1) the pressure and/or temperature of the refrigerant fluid entering a compressor (101) of a refrigeration apparatus (100) having a closed circuit (C) within which a flow rate (P) of refrigerant fluid whose pressure and/or temperature has to be regulated, circulates, a cooling device (102) and an evaporator (103), said regulation device (1) comprising at least one reciprocating compressor (2) equipped with at least one cylinder (7), at least one rod (8), at least one first piston (9a) integrally constrained to said rod and able to be translated within said cylinder, said cylinder (7) being equipped with a first chamber (10) comprising a first port (11) for the suction inflow of a first flow rate of said refrigerant fluid coming from said evaporator and a second port (12) for the outflow of said first flow rate of compressed refrigerant fluid contained in said first chamber (10) and intended to reach said compressor (101), said cylinder (7) further comprising a second chamber (20), which is fluidically separated from said first chamber by said first piston (9a) and equipped with at least one third port (21) for the inflow of a second flow rate (X2) of said refrigerant fluid to displace said piston and compress said refrigerant fluid contained in said first chamber (10), said regulation device (1) further comprising control means (50) for controlling the actuation of said at least one rod (8), which are adapted to divert said at least one second flow rate of said refrigerant fluid for controlling the displacement of said at least one first piston (9a) and compressing the refrigerant fluid of said first flow rate, which is contained in said first chamber, and to re-enter said second flow rate of refrigerant fluid into said closed circuit during the displacement of said at least one first piston (9a) during the step of suctioning said first flow rate of refrigerant fluid, characterised in that said control means (50) comprise a valve (51) equipped with an inlet line (51a) and an outlet line (51b) for said second flow rate, and at least one first passage (52a) through said valve, said valve being rotatable in such a way as to assume at least one first radial position (Pl) in which the fluidic communication between said inlet line (51a) to said rotary valve (51) and said at least one second chamber (20) is allowed through said at least one first passage (52a), for the inflow of said second flow rate into said second chamber (20) and the compression of said first flow rate contained in said at least one first chamber (10), and at least one second radial position (P2) in which the fluidic communication between said at least one second chamber (20) and said outlet line (5 lb) of said rotary valve (51), for the suction of refrigerant fluid within said at least one first chamber (10), is allowed through said at least one passage (52a).
F04B 31/00 - Free-piston pumps specially adapted for elastic fluidsSystems incorporating such pumps
F04B 35/00 - Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
F04B 49/22 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups by means of valves
F25B 1/02 - Compression machines, plants or systems with non-reversible cycle with compressor of reciprocating-piston type
F25B 1/10 - Compression machines, plants or systems with non-reversible cycle with multi-stage compression
F25B 9/00 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
3.
Refrigeration apparatus and operating method thereof
b) of said at least one secondary economizer branch (100) is arranged in proximity of the suction of said main compressor (2), said main branch (M) further comprises at least one reciprocating compressor (6) arranged between said evaporator and said main compressor. Said at least one secondary economizer branch comprises at least one control device for diverting at least one portion (X2) of said fraction (X1) of coolant coming from said secondary economizer branch (100) to drive the reciprocating compressor.
Refrigeration apparatus (1) having a closed circuit (C) in which a flow rate (P) of coolant circulates, said closed circuit comprising at least one main branch (M) provided with at least one main compressor (2), at least one cooling device (3) to cool said coolant, expansion means (4) to expand the coolant and at least one evaporator (5), said closed circuit further comprising at least one secondary economizer branch (100) for at least one fraction of flow rate (X1) of said coolant, wherein the inlet section (100a) of said at least one first secondary economizer branch (100) is arranged in a length (101) of said closed circuit (C) comprised between said cooling device (3) and said expansion means (4) and the outlet section (100b) of said at least one secondary economizer branch (100) is arranged in proximity of the suction of said main compressor (2), said main branch (M) further comprises at least one reciprocating compressor (6) arranged between said evaporator and said main compressor. Said at least one secondary economizer branch comprises at least one control device for for diverting at least one portion (X2) of said fraction (X1) of coolant coming from said secondary economizer branch (100) to drive the reciprocating compressor.
c) connected upstream, via an inlet line (145), to the condenser (140) and downstream, via an outlet line (149), to the main expansion means (170) and a cold branch (15Of) connected, upstream, to an expansion means (142, 144) mounted on a branch (146) of the line (145) and, downstream, to a turbine portion (162) of the turbocompressor unit (160). The invention also relates to a method for circulating a refrigerating fluid inside the abovementioned device.
