Rotatably supporting device for correcting balance of rotating body

A device for correcting balance of a rotating body, comprising:

• a journal supporting part having a mandrel that rotatably supports the rotating body in a floating state about a vertical axis;
• a thrust supporting part that is provided at a lower end portion of the mandrel and supports a bottom part of the rotating body in the floating state;
• a first fluid supply passage that supplies fluid for floating to a rotation support hole of the rotating body;
• an annular groove provided in the thrust supporting part so as to face the bottom part of the rotating body;
• a second fluid supply passage that communicates with the annular groove to supply fluid for floating the rotating body;
• and
• a configuration to switch the fluid supplied to either of the first fluid supply passage or the second fluid supply passage, or both the first and second fluid supply passages, between a compressive fluid and a non-compressive fluid.

A device for correcting balance of a rotating body, comprising:

• a journal supporting part having a mandrel that rotatably supports the rotating body in a floating state about a vertical axis;
• a thrust supporting part that is provided at a lower end portion of the mandrel and supports a bottom part of the rotating body in the floating state;
• and
• a fluid supply passage that supplies fluid for floating to a rotation support hole of the rotating body;
• wherein a first space part and a second space part are formed in at least either one of the mandrel and the rotation support hole,
• wherein the first space part is wider in a radial direction of the rotating body than the second space part, the first space part extends in the radial direction from an outer circumferential surface of the mandrel where supporting portions of the journal supporting part are not positioned to an inner circumferential surface of the rotating body, and the second space part extends in the radial direction from the outer circumferential surface of the mandrel where supporting portions of the journal supporting part are positioned to the inner circumferential surface of the rotating body.

A device for correcting balance of a rotating body, comprising:

• a journal supporting part having a mandrel that rotatably supports the rotating body in a floating state about a vertical axis;
• a thrust supporting part that is provided at a lower end portion of the mandrel and supports a bottom part of the rotating body in the floating state;
• and
• a fluid supply passage that supplies fluid for floating to a rotation support hole of the rotating body;
• wherein a space part is formed in at least either one of the mandrel and the rotation support hole for widening a space other than at a supporting portion,
• wherein recovery means for recovering the fluid is provided at a position confronting an outer periphery of the thrust supporting part.