| 主权项 |
1. A heat exchanger production apparatus utilizing a tube-grasping body, the apparatus wherein
the tube-grasping body is used in a heat exchanger production apparatus 1; the tube-grasping body is also connectable at the exterior of a tube-enlarging mandrel 2, for moving back and forth, along said tube-enlarging mandrel 2 which is penetrable from the opening 7b of a tube 7 inserted into a heat radiating fin 6 of a heat exchanger 5; the tube-grasping body is also equipped with a plurality of tube-contacting parts 3f, capable of radially expanding or axially compressing in the cross direction of the longitudinal length of said tube 7; the tube-grasping body is also equipped with slopes 3b slanting gradually in the widening direction toward the opening 7b of the corresponding tube, wherein each of the slopes 3b is formed on the exterior surface of each of said tube-contacting parts 3f; the tube-grasping body is also equipped with a sliding means which radially expands or axially compresses each of said tube-contacting parts 3f, by sliding back and forth in the longitudinal direction of the tube, along said slopes 3b of the tube-contacting parts 3f; a bump 3e is formed to extrude from the interior surface of each of said tube-contacting parts 3f, at the side of the opening 7b, in the axial direction of the tube 7; a slope 3m, which has a straight or curved sloping side, is formed at said bump 3e, and slanted in the widening direction, from the summit 3p of the bump 3e, toward the opening 7b of the tube 7 facing the end-line 3o of the tube-contacting part 3f, in order to prevent said opening 7b from being deformed by collision of the bump 3e with the opening 7b of the tube 7 when the opening 7b of the tube 7 is connected at its exterior to the tube-contacting parts 3f; a slope 3g, which has a straight or curved sloping side, is formed on the interior circumference of said guide-pipe 3c at its end side, and slanted in the widening direction toward the opening 7b of the corresponding tube 7, in order to reduce the sliding abrasion against each of the slopes 3b formed on the exterior surface of each of said tube-contacting parts 3f; said slope 3b is also formed, on the exterior surface of each of the tube-contacting parts 3f of said tube-grasping body 3, at such a position that the slope 3b is not allowed to reach the end-line 3o of each of said tube-contacting parts 3f; and the tube-grasping body 3 also comprises:
a configuration wherein,said tube-contacting parts 3f, capable of radially expanding or axially compressing, are formed and separated by a plurality of slits 3a which are of prescribed widths 3u, and which are formed in the longitudinal direction of the tube-grasping body 3, the same direction of the movement of the tube-enlarging mandrel 2; andthe width of each of said slits 3a is gradually increased from said prescribed width 3u to an expanded width 3x, from a prescribed location toward the opening 7b of said tube 7. |
