| 摘要 |
<p>A diffusion pump comprising an outer body means to cool the outer body chimney means positioned within the outer body a top cap positioned about the top of the chimney means to form an annular passageway (or an annular array of passageways) therebetween a guard ring positioned generally above the top cap means to cool the guard ring heater means to heat working fluid present in the base of the outer body and cause, in use, evaporated oil to pass up the chimney wherein the pump also comprises baffle means which are thermally substantially isolated from the guard ring and which are contained substantially wholly within the outer body. <IMAGE></p> |
