Defrosting heater, and refrigerator having the defrosting heater

摘要

A defrosting heater in a refrigerator with a flammable refrigerant sealed therein, including a first glass tube ( 53 ) having a heater wire ( 52 ) inside thereof, a plug ( 58 ) covering both end opening parts of the first glass tube ( 53 ) and a second glass tube ( 54 ), a lead wire ( 55 ) piercing the plug ( 58 ) and connected to an end of the heater wire ( 52 ), and a positioning plate ( 57 ) disposed on a connection part of the lead wire ( 55 ) with the heater wire ( 52 ). Flame propagation can be prevented by setting the size of a space ( 58 b) formed by the plug ( 58 ) and the positioning plate ( 59 ) according to the sealing quantity of the flammable refrigerant and the surface temperature of the heater wire ( 52 ), and an unstable state in a defrosting mode is prevented even when the flammable refrigerant leaks.