Tubular coiled heat exchanger and device for manufacturing same

A generally compact multilayer tubular coiled heat exchanger comprising:

• a core;
• tubes having essentially the same length and tightly wound around said core in at least two layers;
• streamlined finned members in the form of wire rods being wound around each of said tubes with a pitch of at least twice the thickness of said member;
• a shell mounted coaxially with said core and encompassing it;
• said tubes are adapted to pass a fluid therealong and therebetween in a space defined by said shell and said core, said tubes being wound around said core to form coils, so that the distances between the centers of the cross-section of tube coils in one layer and between the centers of the cross-sections of the same tube coils of said layer gradually vary from a value equal to the sum of the diameter of one of said tubes plus twice the height of a wire rod fin to a value equal to the sum of the diameter of said tube plus a single height of the wire rod fin, the above distance relationship periodically repeating over the entire length and cross-section of the heat exchanger;
• wherein the finned wire rod surfaces of each tube coil alternately contacts the finned wire rod surfaces and the tube surface of the adjacent tube coils and wherein the number of turns in the layers of a multilayer tubular coiled heat exchanger can be varied without the need for structure distant pieces between the tube layers.