Refrigerating system having two evaporators performing heat exchange

摘要

A refrigerating system is provided in which a heat exchanging unit performs heat exchange between first and second evaporators, so that the first and second evaporators have similar temperatures, and so that an additional “pump-down” operation may be avoided, thereby reducing compressor losses due to discharge occurrences. Since the additional pump-down operation may be avoided, power consumption may be reduced, and reliability and efficiency of the system may be enhanced. Additionally, a backflow preventing unit for preventing backflow of refrigerant in an evaporator may not be required, thus further reducing fabrication cost and complexity.

主权项

1. A refrigerating system for providing cooling to a plurality of cooling spaces, the plurality of cooling spaces comprising a freezing chamber to maintain food items in a frozen state and a refrigerating chamber to maintain food items in a refrigerated state, the refrigerating system comprising:
a first cycle for circulating a refrigerant discharged from a compressor through a first evaporator disposed in the freezing chamber, wherein the first evaporator is configured to supply cooling air to the freezing chamber; a second cycle, independent from the first cycle, for circulating the refrigerant through a second evaporator disposed in the refrigerating chamber, wherein the second evaporator is configured to supply cooling air to the refrigerating chamber; a refrigerant supply device disposed downstream of a condenser and alternately supplying the refrigerant to the first cycle and the second cycle independently such that the refrigerant does not pass through the first evaporator and the second evaporator simultaneously; a first blowing fan disposed at one side of the first evaporator; a second blowing fan disposed at one side of the second evaporator; and a heat exchanging device that performs heat exchange between the first and second evaporators, wherein the heat exchanging device includes a protrusion provided on the first evaporator, wherein the protrusion extends from the first evaporator into the refrigerating chamber to a position proximate the second evaporator such that the refrigerant remaining in the first evaporator is vaporized by a temperature difference between the first evaporator and the second evaporator, and wherein the protrusion comprises a pipe that extends from a part of an outlet of the first evaporator to the position proximate the second evaporator and back to the first evaporator such that the refrigerant remaining in the outlet of the first evaporator is vaporized by the temperature difference between the first and second evaporators and the refrigerant remaining in the first evaporator is collected to the compressor without a pump down operation to collect the refrigerant remaining in the first and second evaporators to the compressor in a state in which the refrigerant supply from the compressor to the first and second evaporators is blocked.