| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure capable of adjusting pump performance in an assembling stage or after assemblage as well as to realize miniaturization and quietness of a pump, in a small pump capable of being used for an air pump for a water tank for ornamental fishes. SOLUTION: A driving body case 15 is a synthetic resin-made integral molded article provided with an upper opening 15a and formed into a cylindrical shape, an inward projecting step part 15b is provided on the inner wall inside the upper opening 15a, and an internal thread 15c is formed on the inner wall positioned above the step part 15b. An external thread 22b formed on the outer wall surface of the opening edge of a lower opening 22a is provided on a pump casing 22. The external thread 22b of the pump casing 22 is to be screwed to the internal thread 15c of the driving body case 15, and an integral air pump is constituted by screwing. In this state, a magnetic pole 13a faces a magnet 21 at the specified distance. |
