Bushing device, water-communicating mechanism and a method of making the water-communicating mechanism

摘要

Provided is a bushing device capable of improving a tight-fitting structure in which a bushing is tightly pushed into a water-communicating hole. A bushing collar is placed between the bushing and an inner wall of the water-communicating hole. An outer surface of the bushing is tapered, and an inner surface of the bushing collar is tapered in accordance with the outer surface of the bushing. When the bushing is secured to the water-communicating hole, the bushing collar is tightly fit into the water-communicating hole as a result of the wedge-shaped effect exerted between the tapered surfaces of the bushing and the bushing collar. Since the tapered surface of the bushing and the bushing collar are tightly fit, it is possible to significantly improve a heat-conductive efficiency between the bushing and the bushing collar, and reducing procedures needed to exchange casings with a good usability.

主权项

1. A bushing device in which a bushing is provided on a device body to be in communication with a water-communicating hole so that an aqueous medium is supplied to said bushing;
said bushing device comprising; a first semi-spherical portion provided at a bottom of said water-communicating hole; said bushing having a bottom-ended cylindrical body and a second semi-spherical portion corresponding to said first semi-spherical portion of said water-communicating hole; a bushing collar placed between said bushing and an inner wall of said water-communicating hole, a diametrical dimension of said bushing collar being arranged to be identical to a diameter of said water-communicating hole when said bushing is secured to said water-communicating hole; and said bushing collar having a third semi-spherical portion in conformity with said first semi-spherical portion of said water-communicating hole; and wherein said bushing has a tapered outer surface and said bushing collar has a tapered inner surface in accordance with said tapered outer surface of the said bushing , and when said bushing is inserted into said water-communicating hole, said tapered outer surface of said bushing engages with said tapered inner surface of said bushing collar while being guided by said tapered inner surface of said bushing collar, so that said bushing pushes said bushing collar tightly against the inner wall of said water-communicating hole.