Refrigeration Appliance And Method For The Operation Thereof

Abstract

A refrigeration appliance contains at least a first and a second temperature zone and a refrigerant circuit that includes a compressor, a first evaporator for cooling the first temperature zone and a second evaporator for cooling the second temperature zone. The first evaporator is serially connected downstream of the second evaporator in the refrigerant circuit, and a controllable throttle point is arranged upstream of the first evaporator and downstream of the second evaporator in the refrigerant circuit. A controller controls the opening degree of the controllable throttle point on the basis of the temperature in the second temperature zone and independently of the temperature in the first temperature zone.

1 - 15 . (canceled) 
     
     
         16 . A refrigeration appliance, comprising:
 temperature zones including at least a first temperature zone and a second temperature zone;   a refrigerant circuit, containing:
 a compressor; 
 a first evaporator for cooling said first temperature zone; 
 a second evaporator for cooling said second temperature zone, said first evaporator is serially connected downstream of said second evaporator in said refrigerant circuit; 
   a first controllable throttling point connected in said refrigerant circuit upstream of said first evaporator and downstream of said second evaporator; and   a first regulator controlling a degree of opening of said first controllable throttling point, independently of a temperature of said first temperature zone, by way of a temperature of said second temperature zone.   
     
     
         17 . The refrigeration appliance according to  claim 16 , wherein said first regulator is set up to increase the degree of opening of said first controllable throttling point when a setpoint temperature in said second temperature zone is exceeded, and to reduce the degree of opening of said first controllable throttling point when the temperature falls below the setpoint temperature in said second temperature zone. 
     
     
         18 . The refrigeration appliance according to  claim 17 , wherein said first regulator is a proportional-integral controller. 
     
     
         19 . The refrigeration appliance according to  claim 17 ,
 further comprising a temperature sensor for said second temperature zone; and   wherein said first regulator has an input connected to said temperature sensor for said second temperature zone.   
     
     
         20 . The refrigeration appliance according to  claim 16 , further comprising a compressor regulator which controls a speed of said compressor by way of the temperature of said first temperature zone. 
     
     
         21 . The refrigeration appliance according to  claim 20 , wherein said compressor regulator is set up to increase the speed of said compressor when a setpoint temperature in said first temperature zone is exceeded, and to reduce the speed of said compressor when the temperature in said first temperature zone falls below the setpoint temperature. 
     
     
         22 . The refrigeration appliance according to  claim 20 , wherein said compressor regulator is coupled to said first regulator and set up to increase the speed when the degree of opening of said first controllable throttling point is increased and to reduce the speed when the degree of opening of said first controllable throttling point is reduced. 
     
     
         23 . The refrigeration appliance according to  claim 20 , wherein said compressor regulator is a proportional-integral controller. 
     
     
         24 . The refrigeration appliance according to  claim 16 ,
 further comprising a second controllable throttling point;   wherein said temperature zones include at least one third temperature zone;   further comprising at least a third evaporator for controlling a temperature of said third temperature zone and connected upstream of said second evaporator in said refrigerant circuit by way of said second controllable throttling point; and   further comprising a second regulator for controlling a degree of opening of said second controllable throttling point by way of the temperature of said third temperature zone.   
     
     
         25 . The refrigeration appliance according to  claim 16 ,
 wherein said compressor having a pressure-side connector; and   further comprising an upstream controllable throttling point disposed in said refrigerant circuit between said pressure-side connector of said compressor and said first and second evaporators, and a degree of opening of said upstream controllable throttling point is controlled by way of a drop in temperature at said first evaporator.   
     
     
         26 . The refrigeration appliance according to  claim 16 , further comprising a ventilator associated with at least one of said first and second evaporators for driving an air current that streams over a surface of at least one of said first and second evaporators. 
     
     
         27 . The refrigeration appliance according to  claim 26 , wherein said ventilator is capable of being switched between operating modes of different speeds. 
     
     
         28 . A method for operating a refrigeration appliance containing at least a first and a second temperature zone and a refrigerant circuit having a compressor, a first evaporator for cooling the first temperature zone and a second evaporator for cooling the second temperature zone, wherein the first evaporator is serially connected in said refrigerant circuit downstream of said second evaporator, and a first controllable throttling point is connected in the refrigerant circuit upstream of the first evaporator and downstream of the second evaporator, which comprises the steps of:
 measuring a temperature of the second temperature zone; and   controlling a degree of opening of the first controllable throttling point, independently of a temperature of the first temperature zone, by way of the temperature of the second temperature zone.   
     
     
         29 . The method according to  claim 28 , which further comprises:
 measuring the temperature of the first temperature zone; and   controlling a speed of the compressor by way of the temperature measured in the first temperature zone.   
     
     
         30 . The method according to  claim 28 , which further comprises:
 increasing a speed of the compressor if the degree of opening of the first controllable throttling point is increased; and   reducing a speed of the compressor if the degree of opening of the first controllable throttling point is reduced.