Refrigeration – Refrigeration producer – Evaporator – e.g. – heat exchanger
Reexamination Certificate
2005-08-16
2005-08-16
Tapolcai, William E. (Department: 3744)
Refrigeration
Refrigeration producer
Evaporator, e.g., heat exchanger
C165S151000, C165S177000, C029S890044
Reexamination Certificate
active
06928833
ABSTRACT:
A heat exchanger finned tube10for use in fabricating a heat exchanger1useful as the evaporator for refrigerators or the like wherein a hydrocarbon refrigerant is used. Two tube insertion holes spaced apart from each other are formed in each of plate fins12, and two straight tube portions11aof a hairpin tube11are inserted through the respective holes of each plate fin to arrange the plate fins12in parallel into a plurality of fin groups13spaced apart on the straight tube portions11alongitudinally thereof. The hairpin tube11is enlarged with use of a fluid to fixedly fit the plate fins12of each tin group13around an enlarged tube portion14of the hairpin tube11and provide a finless part19between each pair of adjacent fin groups13on each of the straight tube portions11a. A restrained small-diameter portion15is provided in each of the finless parts19of each straight tube portion11a. The heat exchanger1fabricated using the finned tube10exhibits the desired refrigeration performance with the leakage of refrigerant diminished.
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Marugasa Shigeo
Watanabe Isao
Ali Mohammad M.
Showa Denko K.K.
Tapolcai William E.
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