| 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 an exterior of a tube-enlarging mandrel (2), for moving back and forth, along said tube-enlarging mandrel (2) which is penetrable from an 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 a cross direction of a longitudinal length of said tube (7); the tube-grasping body is also equipped with first slopes (3b) slanting gradually in a widening direction toward the opening (7b) of a corresponding tube, wherein each of the slopes (3b) is formed on an 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 a longitudinal direction of the tube, along said first slopes (3b) of the tube-contacting parts (3f); a bump (3e) is formed to extrude from an interior surface of each of said tube-contacting parts (3f), at a side of the opening (7b), in an axial direction of the tube (7); a second slope (3m), which has a straight or curved sloping side, is formed at said bump (3e), and slanted in the widening direction, from a summit (3p) of the bump (3e), toward the opening (7b) of the tube (7) facing an 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 third slope (3g), which has a straight or curved sloping side, is formed on the interior circumference of a 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 a sliding abrasion against each of the first slopes (3b) formed on the exterior surface of each of said tube-contacting parts (3f); said first 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 first 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), a same direction of a movement of the tube-enlarging mandrel (2); anda 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). |
