| 摘要 |
The projector consists of a pressure-resistant body (1) containing an inner chamber (7) with an inlet, a plate (21) with at least one row of perforations and an outlet (23). The water in the pressure chamber has to pass through a metal or plastic insert (14) with an upper row of holes (18) and a vertical channel (19) that is common to all of them. The insert is fitted in to a cavity between jaws (10) and the main part of the body with sealing joints (15) between them, and the holes (18) in it are the same diameter and depth as the holes in the adjacent part of the body. The perforated plate, in which the perforations are 120 mic in diameter, is able to slide in the jaws just below the level of the insert.
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