| 摘要 |
In a first embodiment, the assembly includes a shallow, substantially figure eight-shaped chamber of intersecting bores with a pair of rotors journalled therein. The chamber has upper and lower, parallel walls which are joined together by means of a peripheral, chamber-enclosing wall. The lower wall has an aperture therein for opening onto a cylinder of an air compressor, or the like, and the rotors sealingly interface the parallel and peripheral walls. By rotating the rotors toward or away from the aperture, a substantial volume of the chamber is closed off from, or opened to, the aperture. Thus, by mounting the Assembly onto a cylinder, with the aperture opening thereinto, the Assembly can be used to alter the effective volume of the cylinder without significantly adding dimension to the cylinder length or diameter.
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