| 摘要 |
A high pressure air supply duct is terminated by a termination receptacle defining a cylindrical housing with an inlet pipe connected to the duct and generally at right angles to the axis. The housing has one end closed and a mounting flange member at the open end for attachment of the housing to a mounting surface. A generally cylindrical damper sleeve has an open discharge end connected to a vent plate and an insertion portion extending to the bottom of the housing for receiving the air therefrom. The vent plate has a plate portion with a central perforated discharge area which is perforated for the passage of air therethrough and a peripheral surrounding flange and can be rotated about the axis of the housing to rotate the damper sleeve. The damper sleeve has a projecting notch engaging into a slot in the housing to hold it in place. The bottom end of the sleeve is smoothly curved to guide the air to turn from the smaller inlet pipe into the larger housing where it can expand as it passes to the vent plate. The insertion portion of the damper sleeve member is shaped with a cut out to co-operate with the circular cylindrical portion of the housing to move gradually between a first position in which the opening is fully exposed by cut out in the insertion portion allowing passage ofair from the inlet through the full area of the opening into the housing and a second position in which the cut out is turned and the insertion portion fully covers the opening thus closing off flow of air through the opening into the housing such that the insertion portion acts as a damper.
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