Pumps – Motor driven – With means to prevent heat transfer between pump and motor
Patent
1989-09-29
1990-06-26
Rivell, John
Pumps
Motor driven
With means to prevent heat transfer between pump and motor
4174236, 4174238, 41742313, F04B 3902, F04B 3906
Patent
active
049367579
ABSTRACT:
A multi-section vacuum pump includes a pump portion, an intermediate shaft portion provided between the pump portion and an external drive shaft, a drive shaft portion including a drive shaft having a drive gear for driving the intermediate shaft portion and a shaft seal structure on the drive shaft, and a gear box accommodating the timing gear set, the intermediate gear, and the drive gear and allowing the lubricating oil to be reserved at the bottom thereof. The drive shaft portion includes, at the bottom of the drive shaft in the shaft seal structure, oil supply for supplying lubricating oil to an oil reservoir having an oil overflow opening communicating with the gear box, a lubricating oil path for introducing the lubricating oil reservoir being provided having an oil overflow opening communicating with the gear box, a lubricating oil path for introducing the lubrication oil to the oil reservoir being provided inside the drive shaft. Accordingly, a compression heat and a vibration of the pump portion are not transmitted to a fixed ring of the shaft seal structure in the drive shaft portion, the relationship between the rotational speed of the drive shaft and the rotational speed of the rotor support shafts is selected by a drive transmission mechanism, and the circumferential speed of a thrust plane of the shaft seal structure in the drive shaft portion is selected to be an optimum speed.
REFERENCES:
patent: 3734637 (1973-05-01), Beck, Jr.
patent: 4143999 (1979-05-01), Ryall
Higuchi Tutomu
Kambe Shigeharu
Rivell John
Unozawa-Gumi Iron Works, Ltd.
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