| 摘要 |
A HEAT EXCHANGER AND METHOD TO PRODUCE SAME The invention relates to a heat-exchanger (10) incorporating circulation tubes (16) for conducting a -first heat-transfer medium, end plates (12), and surface-enlarging plate-like fins (14) secured to the outer peripheral surfaces of the circulation tubes and arranged to be contacted with a second heat-transfer medium, the fins being firmly secured to the circulation tubes, which extend through holes (18) formed in the fins (14). The fins are secured to the tubes by expanding the tubes so as to enlarge the periphery thereof. In the region of their contact with each circulation tube (16), the fins are substantially planar and oriented in a plane extending at right angles to the longitudinal axis of the circulation tube and are constructed of a single plate-thickness, i.e. with the absence of any collar-like bent portion or any other bent portion of the Fin plate adjacent the contact surface against the circulation tube (16). The contact surfaces of the fins about the inside periphery of the holes (18) which engage against the circulation tubes (16) extend parallel to the longitudinal axis of the circulation tubes over at least a greater part of the axial extent of the holes, which affords stable attachment and good heat-transfer properties. The whole of the heat-exchanger (10) can be coated with an impervious, protective surface layer, for example enamel. (Figure 1) |
