Mitsubishi Denki Kabushiki Kaisha

Akira Baba

Kiyonori Tokumitsu

Sadanori Hirano

A sealing device for an oil rotary vacuum pump of the type which includes a rotor, a cylinder for accommodating the rotor, the cylinder having a suction port and a discharge port, an end cover provided at one end of the cylinder, a rotary shaft of the rotor passing the end cover, an oil casing attached to the end cover such that it encloses the cylinder, the oil casing containing oil, an interior of the oil casing above the oil forming a space portion, and a bearing provided in the end cover so as to rotatably support the rotary shaft of the rotor. The sealing device includes: a pair of sealing members mounted on a rotary shaft of the rotor and provided in the end cover, the sealing members being disposed separately from each other so as to form a gap portion therebetween, the pair of sealing members being located on the side of the bearing which is remote from the rotor; an oil reservoir portion formed between the bearing and the sealing member closer to the rotor in the pair of sealing members; a first passage for connecting the oil reservoir portion with the interior of the cylinder which is in the vicinity of the discharge port thereof; a lubricant disposed in the gap portion between the pair of sealing members; and a second passage for connecting the gap portion between the pair of sealing members and the space portion in the oil casing.

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Fukuoka, Japan

Akira Baba