Metal working – Method of mechanical manufacture – Heat exchanger or boiler making
Reexamination Certificate
2007-01-23
2007-01-23
Leo, Leonard R. (Department: 3753)
Metal working
Method of mechanical manufacture
Heat exchanger or boiler making
C165S150000, C165S179000
Reexamination Certificate
active
10498017
ABSTRACT:
A heat exchanger for use as an evaporator, for example, in refrigerators wherein a hydrocarbon refrigerant is used. The heat exchanger comprises a finned zigzag tube1comprising a zigzag tube member2formed by bending a pipe having no welded seams, the zigzag tube member2having at least three straight tube portions2aarranged from the front rearward at a spacing and parallel to one another, a plurality of first fin groups3arranged at a spacing on two adjacent straight tube portions2aof the zigzag tube member2longitudinally of the straight tube portions and each comprising plate fins5extending across and fixedly arranged in parallel on the adjacent straight tube portions2a, and a plurality of second fin groups4each comprising plate fins6fixedly arranged in parallel on each remaining straight tube portion2aof the zigzag tube member2, the second fin groups4being arranged at a spacing on the remaining straight tube portion2alongitudinally thereof so as to be in the same positions as the respective first fin groups3with respect to the longitudinally direction of the straight tube portions2a. The heat exchanger E comprising the finned zigzag tube1exhibits the desired refrigeration performance with the leakage of refrigerant diminished.
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Kurihara Akio
Marugasa Shigeo
Leo Leonard R.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Showa Denko K.K.
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