Importance

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Abstract

The present invention related to a multiple fluid supplying apparatus for carrier of semiconductor wafer polishing system which comprises a rotary union at a driving side and a rotary union at a following side. The rotary union at a driving side comprises a central rotation axle; a fluid supplying tube body being disposed coaxially with the central rotation axle, being fixedly supported, and being formed with a plurality of fluid paths at an inside thereof; a sealing housing being disposed coaxially on an outer circumference of the fluid supplying tube body so as to be rotatably supported; and a sealing unit for maintaining air-tightness between the fluid supplying tube body and the sealing housing. The rotary union at a following side comprises a central rotation axle; a sealing housing being disposed coaxially along a circumference of the central rotation axle, one end thereof being fixed to an inside of the spindle so as to support the central rotation axle to be rotated stably; and a sealing unit for maintaining air-tightness between the central rotation axle and the sealing housing. According to the present invention, 1) lowering sealing performance by a rolling phenomenon occurring between both ends of a central rotation axle when it rotates is prevented, 2) operational fluid is supplied smoothly to each carrier, and 3) high sealing performance is maintained while simplifying a contact portion between a rotational body and a non-rotational body into a single-layered sealing structure.

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First Claim