Rotary vacuum pumps |
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| 申请号 | US3797971D | 申请日 | 1972-04-13 | 公开(公告)号 | US3797971A | 公开(公告)日 | 1974-03-19 |
| 申请人 | GEN ENGINEERING CO; | 发明人 | WATTS I; | ||||
| 摘要 | A rotary vacuum pump in which the pump shaft extends into a reservoir and is provided with a paddle element connected to a seal which can be located into and out of sealing contact with an oil feed passageway in the pump shaft to allow or prevent the passage of oil from the reservoir to the pump. | ||||||
| 权利要求 | 1. A rotary vacuum pump having a rotatable pump shaft and an oil feed passageway in said shaft, said pump also having an oil reservOir, a seal element rotatably mounted adjacent said shaft oil feed passageway and said reservoir, said seal element and said shaft having alignable oil feed passageways, said shaft having a paddle-like element fixed to said seal element and pivoted on said shaft for limited rotation relative thereto and for being driven thereby, said paddle-like element being immersible in said reservoir, spring means acting on said seal element to bias said seal element to an oil feed passageway misaligned position when said vacuum pump is non-operative, and when said pump is operative said shaft rotates said paddle-like element and causes rotary movement of said seal element relative to said oil feed passageway to cause unsealing of said passageway to permit oil to pass from said reservoir to said pump. 2. A rotary vacuum pump as claimed in claim 1 including stop means on said shaft, and in which the seal element is provided with rotary movement limiting formations arranged to co-operate with said stop means on the shaft. |
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