FREEZING APPARATUS

• Main Authors: OGURA KAZUO, FUNAHASHI NOBUHIRO
• Format: Patent
• Language: English
• Published: 20.05.1997
• Edition: 6
• Subjects: BLASTING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; HEATING; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; REFRIGERATION MACHINES, PLANTS OR SYSTEMS; REFRIGERATION OR COOLING; WEAPONS

PROBLEM TO BE SOLVED: To melt into water remaining frost melted and dropped from a heat exchanger in a defrosting refrigerant pipe and hence prevent re-freezing and enlarging of the frost by flowing a high temperature high pressure refrigerant through a rise part of a drain pan located nearest the lower part of the heat exchanger disposed on the drain pan at least upon defrosting operation. SOLUTION: A high temperature refrigerant from a compressor 1 is condensed and liquefied in an outdoor heat exchanger 3 after passage through a four-way valve 2, and reaches a side plate heater 5b after passage through a check valve 6b in cooling operation. In defrosting operation, the high temperature refrigerant from the compressor 1 reaches a drain pan heater 5a from the four-way valve 2 to heat drain water in the drain pan 5. Then high temperature refrigerant passing through the drain pan heater 5a heats an indoor heat exchanger 4 to melt frost adhering to the surface. The high temperature refrigerant effused from the indoor heat exchanger 4 reaches a side plate heater 5b after passage through a check valve 7b, and drops from the surface of the heat exchanger. Further, remaining frost at a lower end of the heat exchanger and on a drain pan inner side plate is defrosted and supercooled, and is further reduced in its pressure through an outdoor throttle device 6a and is evaporated in the outdoor heat exchanger 3. It is thereafter returned to the compressor 1.