Patent ID: 8171747
Filing Date: 2012-05-08
Classification: F25B

Abstract:
1. A refrigeration device comprising: a compression mechanism configured to compress a refrigerant; a radiator connected to a refrigerant discharge side of said compression mechanism; a first expansion mechanism connected to an exit side of said radiator; a liquid receiver connected to a refrigerant outflow side of said first expansion mechanism; a second expansion mechanism connected to an exit side of said liquid receiver; an evaporator connected to a refrigerant outflow side of said second expansion mechanism and to a refrigerant intake side of said compression mechanism; a temperature detector arranged to detect a refrigerant temperature between the exit side of said radiator and a refrigerant inflow side of said first expansion mechanism; a pressure storing unit configured to store an upper limit and a lower limit of a first pressure of refrigerant flowing from the refrigerant outflow side of said first expansion mechanism to a refrigerant inflow side of said second expansion mechanism; a pressure determining unit configured to determine an upper limit and a lower limit of a second pressure of refrigerant flowing from the refrigerant discharge side of said compression mechanism to the refrigerant inflow side of said first expansion mechanism, the pressure determining unit being configured to determine the upper limit and the lower limit of the second pressure based on the upper limit and lower limit of said first pressure and based on the refrigerant temperature detected by said temperature detector; a pressure detector arranged to detect refrigerant pressure between the refrigerant discharge side of said compression mechanism and the refrigerant inflow side of said first expansion mechanism; and a control unit configured to control said first expansion mechanism and said second expansion mechanism so that