| 摘要 |
The present invention relates to an assembly structure between an inner pipe and an outer pipe of a bubble generating apparatus. According to the present invention, a plurality of inner tubular parts in a short length are formed by selectively forming a plurality of through-holes on a circumferential side of the inner pipe. A plurality of outer tubular parts are formed by selectively forming through-holes on a circumferential side of the outer pipe. Extended flange parts, which can be joined with the outer tubular parts, are arranged on end portions of the outer tubular parts. Shortened flange parts, which can be joined with the inner tubular parts, are arranged on end portions of the inner tubular parts. A sheet part on which an upper portion of a rolling body is mounted is arranged on both flange parts of the outer tubular part. A sheet part on which a lower portion of the rolling body is mounted is arranged on both flange parts of the inner tubular part. The inner pipe smoothly rotates with respect to the outer pipe. Moreover, the inner/outer tubular parts and blind flanges are manufactured by injection or casting. Consequently, the assembly structure enables the bubble generating apparatus to reliably generate air bubbles over a large area at low costs. |
