HEAT EXCHANGER Russian patent published in 2017 - IPC F28D11/08 

FIELD: heating.

SUBSTANCE: heat exchanger comprises a housing with inlet and outlet nozzles for one medium, two concentrically disposed hollow rotors placed in the housing, an inlet and an outlet manifolds for another medium, made in the form of truncated cones plugged at one end and provided with openings on side surface, an inner rotor is made screw and assembled of guide elements made in the form of three rectangular strips with overlaps, alternately bent in opposite directions at an angle of 140° by cuts made at an angle of 60° to each other and to the longitudinal edges of the strips. Rectangular shape overlaps are formed along the internal screw rotor perimeter, they are arranged in series with gaps one after another on zigzag screw lines of base line, and the outer rotor is made screw in the form of a hollow screw surface with external overlap in the form of screw blades along its entire length, and is made of three or more rectangular strips of equal width and length, of a concave or convex shape relative to screw surface axis, folded in a vertical plane in the longitudinal direction and folded along screw lines in the transverse direction on a cylindrical mandrel and interconnected to form overlaps along the screw surface perimeter, made as screw blades on their entire length, and screw lines and screw curved surfaces relative to the screw surface axis with centers of curvature disposed outside or inside the screw surface cross section, and with helical grooves, wherein a helical spring with flat coil section is mounted in the space between the housing and the outer screw rotor, which is made with adjusting pitch change by its extension or compression.

EFFECT: enchanced technological capabilities and intensified heat transfer.

25 dwg