초록 ▼

A supplemental cold air supply unit is disclosed which is incorporated into an existing refrigeration enclosure for supplying cooler ambient air to the refrigeration enclosure when the outside air is at a lower temperature than the air temperature within the enclosure. The cold air supply unit compr

A supplemental cold air supply unit is disclosed which is incorporated into an existing refrigeration enclosure for supplying cooler ambient air to the refrigeration enclosure when the outside air is at a lower temperature than the air temperature within the enclosure. The cold air supply unit comprises a housing which includes a blower fan and a coaxial pipe assembly for cold air inlet and warm air exhaust. Outside and inside thermostats determine when the outside air is at or below the temperature of the air within the enclosure to turn the blower fan on for cooling the refrigeration enclosure when appropriate. The cold air from the outside is exhausted into the refrigeration enclosure through a shuttered opening in the housing, and warm air within the enclosure is returned to the housing through a separate warm air opening for exhaust through the coaxial pipe assembly. The warm air opening includes a door which is opened by means of a cam mechanism and motor electrically connected to the control circuit for the cold air supply unit. When the outside air is at or below the temperature of the air within the enclosure, the outside and inside thermostats turn the blower fan on and cold air is blown into the enclosure for cooling its contents, and simultaneously therewith, the existing refrigeration equipment is turned off in order to conserve energy.

대표청구항 ▼

A supplemental cold air supply system for supplying outside ambient air into a refrigeration enclosure when the outside air is at a temperature equal to or below the air temperature within the enclosure and when the outside air is at a temperature suitable for refrigeration purposes, said supply sys

A supplemental cold air supply system for supplying outside ambient air into a refrigeration enclosure when the outside air is at a temperature equal to or below the air temperature within the enclosure and when the outside air is at a temperature suitable for refrigeration purposes, said supply system comprising: a housing being fastened to said refrigeration enclosure; a blower being mounted within said housing, means for selectively actuating said blower to discharge cold air into said enclosure when the outside ambient air temperature is equal to or lower than the air temperature inside said enclosure; a coaxial pipe assembly being mounted between said container and the outside of said frigeration enclosure, said assembly including a cold air inlet pipe and a warm air exhaust pipe, said warm air exhaust pipe being concentric with said cold air inlet pipe, said cold air inlet pipe having one end connected to the inlet of said blower for providing cold air to said blower; said housing including a first pivotable door for exhausting the cold air discharged from said blower into said enclosure; said housing including a second pivotable door for exhausting the warm air from said enclosure to the outside through said warm air exhaust, said second door being normally closed, means for automatically opening said second door when said blower is operating and discharging cold air into said enclosure through said first door; said means for selectively actuating said blower including a first temperature responsive means mounted outside the refrigeration enclosure for detecting the ambient air temperature of the outside air and a second temperature responsive means mounted inside the enclosure for detecting the air temperature in the enclosure, said first temperature responsive means and said second temperature responsive means being electrically connected in series; and said means for automatically opening said second door including a motor having a rotatable cam arm, said cam arm being engageable with a cam follower mounted on said second door, said cam arm opening said door a predetermined amount in response to said blower being actuated, a first limit means for turning said motor off when said door is closed and a second limit means for turning said motor off when said door is opened to said pre-determined amount.