Refrigeration – Automatic control – Refrigeration producer
Reexamination Certificate
2011-07-12
2011-07-12
Jules, Frantz F (Department: 3784)
Refrigeration
Automatic control
Refrigeration producer
C062S125000, C062S126000, C062S228100, C062S228400, C062S228500, C062S231000
Reexamination Certificate
active
07975497
ABSTRACT:
In a refrigeration unit including a variable performance compressor driven by an inverter motor, a sensor is configured to detect a physical amount corresponding to a refrigerant pressure on the high-pressure side of a refrigerant circuit. A measured value of the physical amount is compared with a first reference value corresponding to a first predetermined pressure of the refrigerant and a second reference value corresponding to a second predetermined pressure lower than the first predetermined pressure. A protective operation can start if the comparison result indicates that an actual refrigerant pressure is higher than the first predetermined pressure. The performance of the compressor can be gradually lowered if the comparison result indicates that an actual refrigerant pressure is between the first predetermined pressure and the second predetermined pressure.
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Hirano Akihiko
Kaga Shinichi
Ueda Takeshi
Comings Daniel C
Hoshizaki Denki Kabushiki Kaisha
Jules Frantz F
Wenderoth , Lind & Ponack, L.L.P.
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