Double cooled draft beer machine

1. A double cooled draft beer machine, comprising:

a cabinet ( 1 );

a refrigeration circuit inside the cabinet ( 1 ), the refrigeration circuit including a compressor ( 2 ), a condenser ( 3 ), and an evaporator ( 4 );

a cold storage chamber ( 6 ) inside the cabinet ( 1 ), the cold storage chamber ( 6 ) used to hold a cask ( 5 ), and the evaporator ( 4 ) is capable of refrigerating the cold storage chamber ( 6 );

a beer pipe ( 7 ) and a refrigeration tube ( 8 ) capable of refrigerating the beer pipe ( 7 ) are arranged inside the cabinet ( 1 );

a beer tap ( 9 ) fixed to an outside of the cabinet ( 1 );

an outer end of the beer pipe ( 7 ) connected to the beer tap ( 9 );

an inner end of the beer pipe ( 7 ) connected to the cask ( 5 );

at least one solenoid valve, including a first solenoid valve, is set up in the refrigeration circuit, the first solenoid valve used to open or close the refrigeration circuit for refrigerant to flow toward the refrigeration tube ( 8 ) or the evaporator ( 4 );

a control chip ( 19 ) used to control an action of the first solenoid valve;

a first temperature sensor ( 20 ) used to detect temperature; and

a detection point ( 29 ) of the first temperature sensor ( 20 ), the detection point ( 29 ) located between the refrigeration tube ( 8 ) and the beer pipe ( 7 );

wherein the refrigeration tube ( 8 ) is connected to the refrigeration circuit and is in parallel with the evaporator ( 4 );

wherein the first temperature sensor ( 20 ) is connected to an input end of the control chip ( 19 ), the first solenoid valve is connected to an output end of the control chip ( 19 ), and a relay ( 10 ) used to control the on-off operation of the compressor ( 2 ) is also connected to the output end of the control chip ( 19 );

wherein an electromagnetic coil of the relay ( 10 ) is connected to and controlled by the output end of the control chip ( 19 ), and a normally open contact of the relay ( 10 ) is connected between the compressor ( 2 ) and a power supply ( 22 ) of the compressor ( 2 );

wherein a first upper limit temperature threshold and a first lower limit temperature threshold of the beer pipe ( 7 ) are set inside the control chip ( 19 );

wherein when the temperature detected by the first temperature sensor ( 20 ) is higher than the first upper limit temperature threshold, the control chip ( 19 ) controls the first solenoid valve to act and switch on the compressor ( 2 ) to allow the refrigerant in the refrigeration circuit to stop flowing toward the evaporator ( 4 ), and instead to allow the refrigerant in the refrigeration circuit to flow toward the refrigeration tube ( 8 ) only; and

wherein when the temperature detected by the first temperature sensor ( 20 ) is equal to or lower than the first lower limit temperature threshold, the control chip ( 19 ) controls the first solenoid valve to act to allow the refrigerant in the refrigeration circuit to stop flowing toward the refrigeration tube ( 8 ).

2. The double cooled draft beer machine as claimed in claim 1 , further comprising:

a second temperature sensor ( 21 ) inside the cold storage chamber ( 6 ), the second temperature sensor ( 21 ) capable of detecting an inner temperature of the cold storage chamber ( 6 ); and

the second temperature sensor ( 21 ) connected to a input end of the control chip ( 19 ), and a second upper limit temperature threshold and a second lower limit temperature threshold of the cold storage chamber ( 6 ) are set inside the control chip ( 19 );

wherein when the temperature detected by the first temperature sensor ( 20 ) is equal to or lower than the first lower limit temperature threshold, and an inner temperature of the cold storage chamber ( 6 ) is higher than the second upper limit temperature threshold, the control chip ( 19 ) controls the first solenoid valve to act and switches on the compressor ( 2 ) to allow the refrigerant to flow toward the evaporator ( 4 ); and

wherein when the temperature detected by the first temperature sensor ( 20 ) is equal to or lower than the first lower limit temperature threshold, and the inner temperature of the cold storage chamber ( 6 ) is equal to or lower than the second lower limit temperature threshold, the control chip ( 19 ) controls the relay ( 10 ) to switch off the compressor ( 2 ) and causes the compressor ( 2 ) to stop working.

3. The double cooled draft beer machine as claimed in claim 2

wherein the refrigeration tube ( 8 ) and the beer pipe ( 7 ) are helically wound into a round or an elliptic cylindrical shaped quick cooler ( 13 );

wherein the quick cooler ( 13 ) comprises at least one mixing layer of a round or an elliptic cylindrical shape, each of the at least one mixing layer is formed by helically winding the refrigeration tube ( 8 ) and the beer pipe ( 7 ) which are arranged in an abreast manner;

wherein an inflowing direction of the beer pipe ( 7 ) is opposite a flowing direction of refrigerant in the refrigeration tube ( 8 ); and

wherein the first temperature sensor ( 20 ) is arranged on the quick cooler ( 13 ) and the detection point ( 29 ) of the first temperature sensor ( 20 ) is close to an outlet end of the beer pipe ( 7 ).

4. The double cooled draft beer machine as claimed in claim 3 wherein

the first solenoid valve is a 3-way solenoid valve ( 16 ); and

wherein an inlet of the 3-way solenoid valve ( 16 ) is connected to a refrigerant outlet of the condenser ( 3 ), a first outlet of the 3-way solenoid valve ( 16 ) is connected to the refrigeration tube ( 8 ), and a second outlet of the 3-way solenoid valve ( 16 ) is connected to the evaporator ( 4 ).