Refrigerator Having Multi-Cycle Refrigeration System And Control Method Thereof

Abstract

The present invention discloses a refrigerator having multi-cycle refrigeration system, comprises a main control circuit, a temperature sensor and a refrigeration cycle loop, wherein the main refrigeration cycle loop is composed of a compressor, a condenser, a main capillary, a freezing evaporator, a refrigerating evaporator and a gas returning pipe connected in series, and wherein, an auxiliary refrigerating cycle branch, which can be controlled independently, is added to refrigerating chamber, i.e. the magnet valve is connected to the downstream of the condenser, and the magnet valve has two output ports, one of which is connected to the main capillary, and the other is connected to an auxiliary refrigerating cycle branch, and the downstream of the branch is connected to the gas returning pipe. The present invention solves the contradiction between the refrigeration efficiency and the function of stopping freezing, and it can optimize the system efficiency in the normal using state in which the refrigerating chamber and the freezing chamber are used simultaneously and reduce the power consumption effectively, and at the same time it can further realize the function of closing the freezing chamber and convert the refrigerating chamber into a freezing chamber of different gradation.

1 . A refrigerator having multi-cycle refrigeration system, comprises a main control circuit, a temperature sensor and a refrigeration cycle loop, wherein the main refrigeration cycle loop is composed of a compressor, a condenser, a main capillary, a freezing evaporator, a refrigerating evaporator and a gas returning pipe connected in series, and wherein, an auxiliary refrigerating cycle branch, which can be controlled independently, is added to refrigerating chamber, i.e. the magnet valve is connected to the downstream of the condenser, and the magnet valve has two output ports, one of which is connected to the main capillary, and the other is connected to an auxiliary refrigerating cycle branch, and the downstream of the branch is connected to the gas returning pipe. 
   
   
       2 . The refrigerator having multi-cycle refrigeration system according to  claim 1 , wherein, in the refrigeration cycle loop, the freezing evaporator is connected before the refrigerating evaporator; the auxiliary refrigerating cycle branch comprises auxiliary capillary and auxiliary refrigerating evaporator connected thereof in series, and the auxiliary refrigerating cycle branch is in parallel with main capillary, freezing evaporator and refrigerating evaporator that are themselves connected in series, and is connected between the output port of the magnet valve and the output port of the refrigerating evaporator, i.e. the inlet of the gas returning pipe. 
   
   
       3 . The refrigerator having multi-cycle refrigeration system according to  claim 1 , wherein, in the refrigeration cycle loop, the refrigerating evaporator is connected before the freezing evaporator; auxiliary refrigerating cycle branch comprises auxiliary capillary and auxiliary refrigerating evaporator connected thereof in series, and the auxiliary refrigerating cycle branch is in parallel with main capillary, refrigerating evaporator and freezing evaporator that are themselves connected in series, and is connected between the output port of the magnet valve and the output port of the freezing evaporator, i.e. the inlet of the gas returning pipe. 
   
   
       4 . The refrigerator having multi-cycle refrigeration system according to  claim 2 , wherein, the magnet valve is a two-position three-way valve, which is connected respectively to the condenser, the main capillary and the auxiliary refrigerating capillary. 
   
   
       5 . The refrigerator having multi-cycle refrigeration system according to  claim 3 , wherein, the magnet valve is a two-position three-way valve, which is connected respectively to the condenser, the main capillary and the auxiliary refrigerating capillary. 
   
   
       6 . The refrigerator having multi-cycle refrigeration system according to  claim 2 , wherein, the magnet valve is comprising two magnet valves in parallel installation, one of which is connected between the condenser and the main capillary, and the other is connected between the condenser and the auxiliary refrigerating capillary. 
   
   
       7 . The refrigerator having multi-cycle refrigeration system according to  claim 3 , wherein, the magnet valve is comprising two magnet valves in parallel installation, one of which is connected between the condenser and the main capillary, and the other is connected between the condenser and the auxiliary refrigerating capillary. 
   
   
       8 . A method of controlling a refrigerator having multi-cycle refrigeration system according to  claim 1 , wherein, it comprises the following steps:
 I. The refrigerator is electrified and initialized, the main control circuit tests whether “Freezing Off” is activated, if it is activated, then the magnet valve switches off the main refrigeration cycle loop and switches on the auxiliary refrigerating cycle branch simultaneously, when the predefined temperature of refrigerating chamber is reached, it returns to the beginning to repeat the test; if “Freezing Off” is not activated, the magnet valve switches on freezing cycle loop and switches off auxiliary refrigerating cycle loop, and it proceeds to Step II;   II. The temperatures of refrigerating chamber and freezing chamber are tested, and when the temperature of the refrigerating chamber or the temperature of the freezing chamber is higher than the predefined startup temperature, compressor is initiated; if the temperature of the freezing chamber is too low and the temperature of the refrigerating chamber is higher than the predefined startup temperature, the magnet valve switches off the freezing cycle loop and switches on the auxiliary refrigerating cycle loop, to reduce the temperature of the refrigerating chamber to the predefined temperature, then it returns to Step I.