Refrigeration machine

Abstract

The expansion device is configured to have a degree of opening corresponding to a fully closed state while the compressor is non-operational. The fan is configured to become non-operational when transition is made, while the compressor is non-operational, from a state in which a temperature difference between a detection temperature of the first temperature sensor and a detection temperature of the second temperature sensor is larger than a criterion value to a state in which the temperature difference is smaller than the criterion value. The fan is configured to become operational when transition is made, while the compressor is operational, from a state in which the temperature difference is smaller than a second criterion value to a state in which the temperature difference is larger than the second criterion value.

1 . A refrigeration machine comprising:
 a refrigerant circuit in which a compressor, a condenser, an expansion device, and a cooler are connected by a refrigerant pipe;   a first storage compartment configured to store a cooling target;   a fan configured to send air from the cooler to the first storage compartment;   a first temperature sensor configured to detect a temperature of the first storage compartment; and   a second temperature sensor configured to detect a temperature of the cooler, wherein   the expansion device is configured to have a degree of opening settable to a fully closed state, and the degree of opening corresponds to the fully closed state while the compressor is non-operational,   the fan is configured to continue to be operational while the compressor is non-operational and when a temperature difference obtained by subtracting a detection temperature of the second temperature sensor from a detection temperature of the first temperature sensor is larger than a first criterion value,   the fan is configured to become non-operational when transition is made, while the compressor is non-operational, from a state in which the temperature difference is larger than the first criterion value to a state in which the temperature difference is smaller than the first criterion value,   the fan is configured to be non-operational while the compressor is operational and when the temperature difference is smaller than a second criterion value,   the fan is configured to become operational when transition is made, while the compressor is operational, from a state in which the temperature difference is smaller than the second criterion value to a state in which the temperature difference is larger than the second criterion value, and   the expansion device includes
 at least one capillary tube, and 
 a valve configured to open and close a refrigerant pipe communicating with the capillary tube. 
   
     
     
         2 . The refrigeration machine according to  claim 1 , comprising a plurality of storage compartments, wherein the first storage compartment is a storage compartment having a lowest setting temperature among the plurality of storage compartments. 
     
     
         3 - 4 . (canceled) 
     
     
         5 . The refrigeration machine according to  claim 2 , further comprising a heat exchanger configured to exchange heat between refrigerant passing through the expansion device and refrigerant in a suction pipe connected to the compressor. 
     
     
         6 . The refrigeration machine according to  claim 5 , wherein not only while the compressor is non-operational but also while the compressor is operational, the expansion device is configured to continue to be in the fully closed state during a period in which the detection temperature of the first temperature sensor is higher than the detection temperature of the second temperature sensor. 
     
     
         7 . The refrigeration machine according to  claim 2 , wherein not only while the compressor is non-operational but also while the compressor is operational, the expansion device is configured to continue to be in the fully closed state during a period in which the detection temperature of the first temperature sensor is higher than the detection temperature of the second temperature sensor. 
     
     
         8 . The refrigeration machine according to  claim 1 , further comprising a heat exchanger configured to exchange heat between refrigerant passing through the expansion device and refrigerant in a suction pipe connected to the compressor. 
     
     
         9 . The refrigeration machine according to  claim 8 , wherein not only while the compressor is non-operational but also while the compressor is operational, the expansion device is configured to continue to be in the fully closed state during a period in which the detection temperature of the first temperature sensor is higher than the detection temperature of the second temperature sensor. 
     
     
         10 . The refrigeration machine according to  claim 1 , wherein not only while the compressor is non-operational but also while the compressor is operational, the expansion device is configured to continue to be in the fully closed state during a period in which the detection temperature of the first temperature sensor is higher than the detection temperature of the second temperature sensor.