Heat exchanger having a plurality of plate-like fins and a plurality of flat-shaped heat transfer pipes orthogonal to the plate-like fins

摘要

A heat exchanger provided with a plurality of plate-like fins 2 arranged in parallel with a predetermined interval and a plurality of flat-shaped heat transfer pipes 3 inserted in a direction orthogonal to said plate-like fins 2 and through which a refrigerant flows, in which said heat transfer pipe 3 has an outside shape with a flat outer face arranged along an air flow direction and a section substantially in an oval shape and first and second refrigerant flow passages 31a, 31b made of two symmetric and substantially D-shaped through holes having a bulkhead 32 between the two passages inside, which is bonded to said plate-like fin 2 by expanding diameters of said first and second refrigerant flow passages 31a, 31b by a pipe-expanding burette ball.

主权项

1. A heat exchanger provided with a plurality of plate-like fins arranged in parallel with a predetermined interval and a plurality of flat-shaped heat transfer pipes inserted in a direction orthogonal to said plate-like fins and through which a refrigerant flows, wherein
said heat transfer pipes have an outside shape with a flat outer face arranged along an air flow direction and a section substantially in an oval shape and first and second refrigerant flow passages made of two symmetric and substantially D-shaped through holes having a bulkhead between the two passages inside, which are press bonded to said plate-like fins by expanding diameters of said first and second refrigerant flow passages by a pipe-expanding burette ball, said first and second refrigerant flow passages have a plurality of protruding strips extending in an axial direction on an inner wall face other than said bulkhead, said plurality of protruding strips includes a protruding strip provided at corner portions of the bulkhead with a greater height than other protruding strips in said plurality of protruding strips, and distances from a center of said first and second refrigerant flow passages in the substantially oval-shaped section to each of the distal end portions of the plurality of the protruding strips are substantially equal, the center of said first and second refrigerant flow passages match a center of the pipe-expanding burette balls being inserted into said first and second refrigerant flow passages.