Medium- and Low-Temperature Integrated Refrigerating/Freezing System

Abstract

A medium- and low-temperature integrated refrigerating/freezing system ( 40 ) comprises an integrated unit ( 41 ), a medium-temperature refrigerating cabinet ( 43 ), a low-temperature freezing cabinet ( 42 ) and corresponding connecting pipes ( 44 ). The integrated unit ( 41 ) further comprises a common condenser ( 54 ) for condensing the high-temperature and high-pressure gaseous refrigerant in the medium-temperature refrigerating system and the low-temperature freezing system, a common reservoir ( 55 ) for the storage of the high-temperature and high-pressure liquid refrigerant in the medium-temperature refrigerating system and the low-temperature freezing system, a subcooling adjusting mechanism ( 56, 57 ) for adjusting the subcooling degree in the low-temperature freezing system and a suction temperature adjusting mechanism ( 431, 432, 58 ) for adjusting the suction temperature of the low-temperature freezing system.

1 . A medium- and low-temperature integrated refrigerating/freezing system ( 40 ) for providing refrigerating medium temperature for food storage, etc. and freezing-low temperature for cold drink storage, etc., which comprising an integrated unit ( 41 ), a (group of) medium-temperature refrigerating cabinet(s) ( 43 ), a (group of) low-temperature freezing cabinet(s) ( 42 ) and corresponding connecting pipes ( 44 ), wherein said integrated unit comprises:
 a common condenser ( 54 ) for condensing high-temperature and high-pressure gaseous refrigerant in the medium-temperature refrigerating system and the low-temperature freezing system;   a common reservoir ( 55 ) for storing the high-temperature and high-pressure liquid refrigerant in the medium-temperature refrigerating system and the low-temperature freezing system;   a subcooling adjusting mechanism ( 56 ,  57 ) for adjusting the subcooling in the low-temperature freezing system; and   a suction temperature adjusting mechanism ( 431 ,  432 ,  58 ) for adjusting the suction temperature of the low-temperature freezing system.   
   
   
       2 . The medium- and low-temperature integrated refrigerating/freezing system as claimed in  claim 1 , wherein said integrated unit further comprises a (group of) medium-temperature compressor(s) ( 53 ) and a (group of) low-temperature compressor(s) ( 52 ). 
   
   
       3 . The medium- and low-temperature integrated refrigerating/freezing system as claimed in  claim 2 , wherein said medium-temperature refrigerating cabinet(s) and said low-temperature freezing cabinet(s) comprise respectively an evaporator ( 64 ), an expansion valve ( 63 ) and a product cabinet ( 61 ) for food placement. 
   
   
       4 . The medium- and low-temperature integrated refrigerating/freezing system as claimed in  claim 3 , wherein the suction end(s) of said medium-temperature compressor(s) and low-temperature compressor(s) are respectively connected to the evaporators of the medium-temperature refrigerating cabinet(s) and the low-temperature freezing cabinet(s), and the exhaust ends thereof are jointly connected to the inlet end of said common condenser. 
   
   
       5 . The medium- and low-temperature integrated refrigerating/freezing system as claimed in  claim 4 , wherein the outlet end of the common condenser ( 54 ) is connected to the inlet end of the reservoir ( 55 ). 
   
   
       6 . The medium- and low-temperature integrated refrigerating/freezing system as claimed in  claim 5 , wherein an expansion valve ( 57 ), an intermediate heat exchanger ( 56 ) and said corresponding connecting pipes in said integrated unit form said subcooling adjusting mechanism. 
   
   
       7 . The medium- and low-temperature integrated refrigerating/freezing system as claimed in  claim 6 , wherein a first inlet end of the intermediate heat exchanger of said subcooling adjusting mechanism is directly connected to said reservoir, and a second inlet end is connected to said reservoir via said expansion valve. 
   
   
       8 . The medium- and low-temperature integrated refrigerating/freezing system as claimed in  claim 7 , wherein a first outlet end of said intermediate heat exchanger is connected to an inlet end of said low-temperature freezing cabinet. 
   
   
       9 . The medium- and low-temperature integrated refrigerating/freezing system as claimed in  claim 8 , wherein said suction temperature adjusting mechanism comprises a first branch ( 431 ) connecting a second outlet end of said intermediate heat exchanger ( 56 ) with the suction end of said medium-temperature compressor ( 53 ), and a second branch ( 432 ) connecting the second outlet end of said intermediate heat exchanger with the suction end of said low-temperature ( 52 ) compressor, wherein said second branch contains an adjustment valve ( 58 ). 
   
   
       10 . The medium- and low-temperature integrated refrigerating/freezing system as claimed in  claim 1 , wherein the integrated unit is connected to said medium-temperature refrigerating cabinet and said low-temperature freezing cabinet in a plug-and-play manner. 
   
   
       11 . A refrigerating system ( 40 ) comprising:
 at least one medium-temperature refrigerating device ( 43 ) comprising at least one medium-temperature evaporator;   at least one low-temperature freezing device ( 42 ) comprising at least one low-temperature evaporator; and   an integrated unit ( 41 ) comprising:
 at least one medium-temperature compressor ( 53 ) connected to said medium-temperature evaporator; 
 at least one low-temperature compressor ( 52 ) connected to said low-temperature evaporator; 
 a condenser ( 54 ) connected to the exhaust ends of said at least one medium-temperature compressor and the at least one low-temperature compressor, for condensing the high-temperature and high-pressure gaseous refrigerant exhausted from the exhaust ends of said at least one medium-temperature compressor and the at least one low-temperature compressor; 
 a reservoir ( 55 ) connected to said condenser for storing the high-temperature and high-pressure liquid refrigerant exhausted from the condenser; 
 a subcooling adjusting mechanism ( 56 ,  57 ) connected with said reservoir and to said low-temperature evaporator for adjusting the subcooling of a low-temperature freezing circulation system; 
 a suction temperature adjusting mechanism ( 431 ,  432 ,  58 ) connected with said reservoir and respectively to said low-temperature compressor and said medium-temperature compressor, for adjusting the suction temperature of the low-temperature freezing circulation system; and 
 a medium-temperature connecting pipeline ( 71 ) connected to said reservoir and the medium-temperature evaporator. 
   
   
   
       12 . The refrigerating system as claimed in  claim 11 , wherein said subcooling adjusting mechanism comprises an intermediate heat exchanger ( 56 ) connected to said low-temperature evaporator, a first inlet end thereof is directly connected to said reservoir, and a second inlet end thereof is connected to said reservoir via an expansion valve. 
   
   
       13 . The refrigerating system as claimed in  claim 12 , wherein a first outlet end of said intermediate heat exchanger is connected to the low-temperature evaporator of said low-temperature freezing device. 
   
   
       14 . The refrigerating system as claimed in  claim 13 , wherein said suction temperature adjusting mechanism comprises a first branch connecting the second outlet end of said intermediate heat exchanger with the suction end of said medium-temperature compressor, and a second branch connecting the second outlet end of said intermediate heat exchanger with the suction end of said low-temperature compressor, wherein said second branch contains an adjustment valve. 
   
   
       15 . A refrigeration system ( 40 ) comprising:
 a first compartment ( 42 );   a second compartment ( 43 );   at least one compressor ( 52 ,  53 ) for compressing refrigerant;   a condenser ( 54 ) for condensing compressed refrigerant from the at least one compressor;   a reservoir for storing condensed refrigerant;   a first expansion device and a first evaporator in a flow path ( 72 ) associated with the first compartment for expanding refrigerant and cooling the first compartment; and   a second expansion device and second evaporator in a flow path ( 71 ) associated with the second compartment for expanding the condensed refrigerant and cooling the second compartment,   further characterized by:
 means ( 56 ,  57 ,  58 ,  431 ,  432 ) for adjusting a degree of overcooling and adjusting a suction temperature of refrigerant associated with the first compartment. 
   
   
   
       16 . The system of  claim 15  wherein:
 the condenser ( 54 ) and the reservoir ( 55 ) are common to the flow path ( 72 ) associated with the first compartment and the flow path ( 71 ) associated with the second compartment.   
   
   
       17 . A method for operating the system of  claim 15 , comprising:
 under automated control, using said means for adjusting to adjust the degree of subcooling and the suction temperature of refrigerant associated with the first compartment.