Refrigeration cycle using six-way change-over valve

A refrigeration cycle, comprising:

• a compressor;
• an indoor heat exchanger;
• an expansion device;
• an outdoor heat exchanger;
• a defrosting circuit including an electromagnetic opening and closing valve which is connected between a discharge side of said compressor and a primary side of said outdoor heat exchanger;
• a six-way change-over valve having a refrigerant passage through which refrigerant flows among said compressor, said indoor heat exchanger, said expansion device, and said outdoor heat exchanger, wherein said six-way change-over valve serves to selectively switch the refrigerant passage so that the refrigerant passing in said indoor and outdoor heat exchangers flows in the same direction at any time when the refrigerant cycle is switched to a cooling operation cycle and when the refrigerant cycle is switched to a heating operation cycle and wherein the refrigerant in said defrosting circuit bypasses said six-way change-over valve.

A refrigeration cycle having a compressor, an outdoor heat exchanger, an indoor heat exchanger, a first expansion device which is switchable between a validity state and a non-validity state for an expansion action, and a second expansion device which is switchable between a validity state and a non-validity state for an expansion action, comprising:

• a six-way change-over valve which is provided with six ports from a first port to a sixth port, and can be selectively set to either a first state where said first port and said fourth port are allowed to intercommunicate with each other, said second port and said sixth port are allowed to intercommunicate with each other and said third port and said fifth port are allowed to intercommunicate with each other, or a second state where said first port and said sixth port are allowed to intercommunicate with each other, said second port and said fifth port are allowed to intercommunicate with each other, and said third port and said fourth port are allowed to intercommunicated with each other;
• a first refrigerant pipe for connecting a discharge port of said compressor to said first port of said valve;
• a second refrigerant pipe for connecting a suck-in port of said compressor to said fifth port of said valve;
• a third refrigerant pipe for connecting an inlet port of said outdoor heat exchanger to said fourth port of said valve;
• a fifth refrigerant pipe for connecting an outlet port of said outdoor heat exchanger through said first expansion device to said second port of said valve;
• a sixth refrigerant pipe for connecting an inlet port of said indoor heat exchanger to said sixth port of said valve;
• and
• a seventh refrigerant pipe for connecting an outlet port of said indoor heat exchanger through said second expansion device to said third port of said valve, wherein said six-way change-over valve is kept to the first state by setting said first expansion device to the validity state and setting said second expansion device to the non-validity state when a cooling operation is performed by said indoor heat exchanger, and kept to the second state by setting said first expansion device to the non-validity state and setting said second expansion device to the validity state when a heating operation is performed by indoor heat exchanger.

A refrigeration cycle having a compressor, an outdoor heat exchanger, an indoor heat exchanger, a first expansion device which is switchable between a validity state and a non-validity state for an expansion action, and a second expansion device which is switchable between a validity state and a non-validity state for an expansion action, comprising:

• a six-way change-over valve which is provided with six ports from a first port to a sixth port, and can be selectively set to either a first state where said first port and said sixth port are allowed to intercommunicate with each other, said second port and said fifth port are allowed to intercommunicate with each other and said third port and said fourth port are allowed to intercommunicate with each other, or a second state where said first port and said fourth port are allowed to intercommunicate with each other, said second port and said sixth port are allowed to intercommunicate with each other, and said third port and said fifth port are allowed to intercommunicated with each other;
• a first refrigerant pipe for connecting a discharge port of said compressor to said first port of said valve;
• a second refrigerant pipe for connecting a suck-in port of said compressor to said fifth port of said valve;
• a third refrigerant pipe for connecting an inlet port of said outdoor heat exchanger to said fourth port of said valve;
• a fifth refrigerant pipe for connecting an outlet port of said outdoor heat exchanger through said first expansion device to said second port of said valve;
• a sixth refrigerant pipe for connecting an inlet port of said indoor heat exchanger to said sixth port of said valve;
• and
• a seventh refrigerant pipe for connecting an outlet port of said indoor heat exchanger through said second expansion device to said third port of said valve, wherein said six-way change-over valve is kept to the first state by setting said first expansion device to the validity state and setting said second expansion device to the non-validity state when a cooling operation is performed by said indoor heat exchanger, and kept to the second state by setting said first expansion device to the non-validity state and setting said second expansion device to the validity state when a heating operation is performed by indoor heat exchanger.