Other

Anna N Sergeeva

Vladimir N Krotkov

Igor Martynovich Kalnin

Viktor I Plokhov

Anatoly A Saprykin

Veniamin K Erokhov

Oleg A Sergeev

Lev P Kirillov

Evgeny D Konovalenko

Jury S Starostin

Taisia M Sutyrina

Mikhail F Golovinov

Antonina I Berdjugina

A needle comprising a cylindrical portion, a portion with longitudinal profiled channels intended to form the internal fins of a pipe, said portions being spaced apart lengthwise the needle and an intermediate portion joining the first two portions and varying in diameter which first decreases then increases in the direction from the cylindrical portion to the portion with profiled channels. The portion with profiled channels has the form of a truncated cone whose smaller base is directed towards the cylindrical portion. The needle according to the invention is used for pressing pipes with internal fins whose height exceeds their thickness by more than 4 times.

Needle for pressing internally-finned pipes

A heat exchanger includes ribs mounted transversely of the axis of the tube and uniformly spaced therealong. Each rib includes a plate with corrugations oriented along the flow of the fluid washing the tube. The ribs adjoin one another, their corrugations having lateral slits, the wall portions between these slits being offset relative to one another to provide passages for the flow of the fluid. Owing to this structure the thickness of the boundary layer at each one of said portions is reduced, and the effectiveness of heat exchange is stepped up. Furthermore, a heat exchanger with the disclosed ribs is considerably more compact and needs less metal for its construction, as compared with known heat exchangers.

Tubular heat exchanger

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Moscow, Russia

Anna N Sergeeva