Refrigerating circuit for use in a motor vehicle

Abstract

A refrigerating circuit for use in a motor vehicle has a refrigerant compressor ( 8 ) connected on the output side to a pressure line ( 4 ) and on the input side to a suction line ( 6 ). The refrigerating circuit has at least one condenser ( 10 ), at least one regulated expansion valve ( 14 ), at least one evaporator ( 16 ) and at least one inner heat exchanger ( 12 ). The regulated expansion valve ( 14 ) has a temperature t E in a detection zone ( 20 ) of the suction line ( 6 ) as a controlled variable. The detection zone ( 20 ) for the regulated expansion valve ( 14 ) is arranged at the output of the inner heat exchanger ( 12 ).

1 . A refrigerating circuit for use in a motor vehicle, comprising:
 a refrigerant compressor with an output side connected to a pressure line and an input side connected to a suction line;   at least one condenser;   at least one regulated expansion valve;   at least one evaporator; and   at least one inner heat exchanger, wherein   the regulated expansion valve has a temperature t E  in a detection zone of the suction line as a controlled variable, the detection zone for the regulated expansion valve being arranged at an output of the inner heat exchanger.   
     
     
         2 . The refrigerating circuit of  claim 1 , wherein the regulated expansion valve is a thermostatic expansion valve connected to one of the outlets of the inner heat exchanger by a control line that is part of the suction line. 
     
     
         3 . The refrigerating circuit of  claim 1 , wherein the regulated expansion valve is a thermostatic expansion valve with a detector in the detection zone. 
     
     
         4 . A refrigerating circuit for use in a motor vehicle, comprising:
 a refrigerant compressor with an output side connected to a pressure line and an input side connected to a suction line;   a condenser communicating with the pressure line;   a regulated expansion valve communicating with the suction line;   an evaporator communicating with the regulated expansion valve;   an inner heat exchanger having a pressure-side inlet communicating with the condenser via the pressure line, a pressure-side outlet communicating with the pressure-side inlet and with the regulated expansion valve, a suction-side inlet communicating with the evaporator and a suction side outlet communicating with the suction-side inlet and with the regulated expansion valve; and   a detection zone at the suction-side outlet of the inner heat exchanger and controlling the regulated expansion valve in accordance with a temperature t E  in a detection zone of the suction line, thereby adjusting a mass flow rate of the refrigerant through the inner heat exchanger.   
     
     
         5 . The refrigerating circuit of  claim 4 , wherein the regulated expansion valve is a thermostatic expansion valve connected to one of the outlets of the inner heat exchanger by a control line that is part of the suction line. 
     
     
         6 . The refrigerating circuit of  claim 4 , wherein the regulated expansion valve is a thermostatic expansion valve with a detector arranged in the detection zone. 
     
     
         7 . A refrigerating circuit for use in a motor vehicle, comprising:
 a refrigerant compressor;   a condenser;   a regulated expansion valve;   an evaporator;   an inner heat exchanger;   a pressure line extending from an output side of the refrigerant compressor and passing through the condenser, through the inner heat exchanger and to the regulated expansion valve;   a suction line extending from the regulated expansion valve, through the evaporator, through the inner heat exchanger, back through the regulated expansion valve and to an input side of the refrigerant compressor; and   a control means at a suction side output of the inner heat exchanger for controlling the regulated expansion valve and thereby controlling flow of refrigerant through the inner heat exchanger so that the refrigerant flowing through the evaporator is in a wet vapor phase and so that only gaseous refrigerant is input to the refrigerant compressor.   
     
     
         8 . The refrigerating circuit of  claim 7 , wherein the regulated expansion valve a thermostatic expansion valve connected to one of the outlets of the inner heat exchanger by a control line that is part of the suction line. 
     
     
         9 . The refrigerating circuit of  claim 8 , wherein the regulated expansion valve is a thermostatic expansion valve with a detector arranged in the detection zone.