| 摘要 |
<p>The pump pumps from left to right for clockwise shaft 1 rotation in the configuration shown. If the relative rotor position is changed, by turning eccentric mounting ring 10 through 180 DEG C, the relative internal rotor/pinion geometry would change, so as to pump R to L for the same clockwise rotation. If alternatively the rotor sense of rotation is changed, then, although the pumped direction initially also changes from R to L, ball 20 or a roller, instead of rattling loose in its crescent-shaped cavity 19, will bind and entrain ring 10 with rotor 5, causing it to rotate. After 180 DEG C, the ball meets end 21b of a strip of steel fixed beneath a cover plate and is dislodged so that ring 10 stops rotating. The geometric change thus engendered gives L to R pumping once more. The same applies in the reverse sense, using end 21a. Thus, whichever way the shaft rotates L to R pumping is automatically achieved, e.g. for safety as an oil pump for a compressor. <IMAGE></p> |
