| 摘要 |
PURPOSE:To improve the strength of a nozzle part by forming the padding part of the nozzle and a part having U-shape which receives the force for revolving a stretch tube, in an internal pump. CONSTITUTION:When a key 8 is used as a revolution preventing structure in an internal pump consisting of a stretch tube 4 and a pump shaft 12 which are opposed to the padding 14 of an internal pump nozzle 16, the key way part of the nozzle 6 and a basic material 6a in the vicinity are ground deeper by the necessary thickness (t) durable against the gap environment than that of other parts, and all the circumference inside the nozzle is applied with the durable padding 14 by a thickness (t). Therefore, the necessity of applying the thick padding at least in the necessary thickness (t) onto all the circumference inside the nozzle is obviated, and the strength of the nozzle 6 is improved by the reduction portion in the padding thickness.
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