| 摘要 |
This invention relates to a turboblower for lasers, adapted to forcibly circulate a laser gas in a gas laser processing unit, and a laser oscillator. The turboblower is constituted of a shaft (26) having a turbo-vane (16) at the front end thereof, a pair of bearings (19, 20) supporting the shaft (26), and motors (17, 18) for rotating the shaft (26). Non-contacting seals (35, 36, 37, 38) for preventing the outflow of grease are provided, and grease holding spaces (31, 32, 33, 34) are formed on both sides of the bearings (19, 20). The grease in the bearings which is urged by the centrifugal force of the rotating shaft (26) in the scattering direction thereof does not flow out of the interior of the spaces (31, 32, 33, 34) owing to the non-contacting seals (35, 36, 37, 38). This enables the lifetime of the bearings to be prolonged, and the reliability and the efficiency of maintenance of the apparatuses according to the present invention to be improved. |
