Air conditioner

An air conditioner comprising:

• a compressor for compressing a refrigerant,
• an outdoor heat-exchanger,
• a thermal electric type expansion valve serving as a pressure reducing device for controlling flow rate of said refrigerant,
• an indoor heat-exchanger,
• refrigerant pipes connecting said compressor, said outdoor heat-exchanger, said device and said indoor heat-exchanger in series,
• characterized in that:
• said valve comprises a valve part and a driving part,
• said valve part comprises a valve seat disposed in a fluid path between a pair of ports, a valve rod which is movable in relation to said valve seat thereby to change flow rate of the valve,
• said driving part comprises, in a casing, a pair of bimetal pieces which are linked each other by a heat insulating spacer to said casing, one of said bimetal pieces supporting said valve rod and the other of said bimetal pieces being held by said casing in a heat insulated manner, said first bimetal piece having a heater wire disposed in heat conductive relation thereto to move said rod responding to an input of electric power to said wire,
• said air conditioner further comprises an electric power output means which issues said input electric power, value of which changes responding to a refrigerant state difference between a first refrigerant state measured by a first measurement element disposed on either one of said indoor heat-exchanger or said outdoor heat-exchanger that is functioning as an evaporator at a central position of extended length thereof where the refrigerant always is in a mixed phase of gas and liquid and a second refrigerant state measured by a second measurement element disposed at a part between said either one of said indoor heat-exchanger or said outdoor heat-exchanger functioning as an evaporator and said compressor,
• said first and said second measurement elements are thermistors which give electric signals responding to the measured temperature to said electric power output means, and
• said electric power output means produces said electric input power of a value responding to a difference of resistances of said thermistors from a predetermined resistance difference.

An air conditioner comprising:

• a compressor for compressing a refrigerant,
• an outdoor heat-exchanger,
• a pressure reducing device which controls flow rate of said refrigerant,
• an indoor heat-exchanger,
• refrigerant pipes connecting said compressor, said outdoor heat-exchanger, said valve and said indoor heat-exchanger in series,
• characterized in that
• said pressure reducing device is a thermal electric bilateral direction type expansion valve comprising a bimetal piece held in a heat insulated manner and to move its moving part responding to an input electric power to a heater to heat said bimetal piece thereby to change flow rate of said valve and
• said air conditioner further comprises
• refrigerant state measurement elements disposed respectively on said outdoor heat-exchanger and said indoor heat-exchanger and another refrigerant state measurement element disposed at the refrigerant input end of said compressor and
• an electric power output means which issues said input electric power, value of which changes responding to a refrigerant state difference between a first refrigerant state measured by said refrigerant state measurement element disposed on either one of said indoor heat-exchanger or said outdoor heat-exchanger that is functioning as an evaporator and a second refrigerant state measured by said another refrigerant state measurement element.

An air conditioner comprising:

• a compressor for compressing a refrigerant,
• an outdoor heat-exchanger,
• a pressure reducing device which controls flow rate of said refrigerant,
• an indoor heat-exchanger,
• refrigerant pipes connecting said compressor, said outdoor heat-exchanger, said valve and said indoor heat-exchanger in series,
• characterized in that
• said compressor is a variable capacity type compressor,
• said pressure reducing device is a thermal electric type expansion valve comprising a valve part and a driving part to drive said valve part, a bimetal piece held in said driving part in a heat insulated manner and to move its moving part responding to an input electric power to a heater to heat said bimetal piece thereby to change flow rate of said valve, said moving part driving said valve part and
• said air conditioner further comprises
• a refrigerant circuit switching valve for reversing the direction of refrigerant with respect to said heat-exchangers,
• refrigerant state measurement elements disposed respectively on said outdoor heat-exchanger and said indoor heat-exchanger and another refrigerant state measurement element disposed on a refrigerant pipe between either of said heat-exchanger and the refrigerant input end of said compressor and
• an electric power output means which issues said input electric power, value of which changes responding to a refrigerant state difference between a first refrigerant state measured by said refrigerant state measurement element disposed on either one of heat-exchanger that is functioning as an evaporator and a second refrigerant state measured by said another refrigerant state measurement element.

An air conditioner comprising:

• a compressor for compressing a refrigerant,
• an outdoor heat-exchanger,
• a pressure reducing device which controls flow rate of said refrigerant,
• an indoor heat-exchanger,
• refrigerant pipes connecting said compressor, said outdoor heat-exchanger, said valve and said indoor heat-exchanger in series,
• characterized in that
• said compressor is a variable capacity compressor,
• said pressure reducing device is a thermal electric bilateral direction type expansion valve comprising a bilateral valve part and a driving part to drive said bilateral valve part, a bimetal piece held in said driving part in a heat insulated manner and to move its moving part responding to an input electric power to a heater to heat said bimetal piece thereby to change flow rate of said valve, said moving part driving said valve part and
• said air conditioner further comprises
• a refrigerant circuit switching valve for reversing the direction of refrigerant with respect to said heat-exchangers,
• refrigerant state measurement elements disposed respectively on said outdoor heat-exchanger and said indoor heat-exchanger and another refrigerant state measurement element disposed at the refrigerant input end of said variable capacity compressor and
• an electric power output means which issues said input electric power, value of which changes responding to a refrigerant state difference between a first refrigerant state measured by said refrigerant state measurement element disposed on either one of said indoor heat-exchanger or said outdoor heat-exchanger that is functioning as an evaporator and a second refrigerant state measured by said another refrigerant state measurement element.

An air conditioner comprising:

• a compressor for compressing a refrigerant,
• an outdoor heat-exchanger,
• a pressure reducing device which controls flow rate of said refrigerant,
• an indoor heat-exchanger,
• refrigerant pipes connecting said compressor, said outdoor heat-exchanger, said valve and said indoor heat-exchanger in series,
• characterized in that
• said compressor is a variable capacity type compressor,
• said pressure reducing device is a thermal electric bilateral direction type expansion valve comprising a valve part and a driving part to drive said valve part, a bimetal piece held in said driving part in a heat insulated manner and to move its moving part responding to an input electric power to a heater to heat said bimetal piece thereby to change flow rate of said valve, said moving part driving said valve part and
• said air conditioner further comprises
• a refrigerant circuit switching valve for reversing the direction of refrigerant with respect to said heat-exchangers,
• refrigerant state measurement elements disposed respectively on said outdoor heat-exchanger and said indoor heat-exchanger and another refrigerant state measurement element disposed at the refrigerant input end of said variable capacity type compressor and
• an electric power output means which issues said input electric power, value of which changes responding to a refrigerant state difference between a first refrigerant state measured by said refrigerant state measurement element disposed on either one of said indoor heat-exchanger or said outdoor heat-exchanger that is functioning as an evaporator and a second refrigerant state measured by said another refrigerant state measurement element.