Bearing device and hydraulic machine

A bearing device for a hydraulic machine having a rotary shaft of a vertical shaft, the bearing device comprising:

• a water tank configured to store lubrication water;
• a bearing pad configured to support a skirt member provided on the rotary shaft in the lubrication water from a radial direction;
• a first supporting mechanism configured to slidably support the bearing pad from the radial direction in the lubrication water;
• a second supporting mechanism configured to slidably support the bearing pad from a bottom portion side in an axial direction in the lubrication water;
• a makeup tank disposed at a position higher than a disposed position of the water tank, the makeup tank being configured to store the lubrication water;
• a lifting pipe connecting the water tank and the makeup tank;
• a pump disposed on the lifting pipe, the pump being configured to pump up the lubrication water in the water tank to the makeup tank;
• a water supply pipe configured to supply the lubrication water in the makeup tank to the water tank;
• and
• a valve disposed on the water supply pipe, the valve being configured to control supply of the lubrication water to the water tank,
• wherein one of a supporting surface supporting the bearing pad in the first supporting mechanism and a supported surface supported by the supporting surface in the bearing pad is formed in a convex shape,
• wherein one of a supporting surface supporting the bearing pad in the second supporting mechanism and a supported surface supported by the supporting surface in the bearing pad is formed in a convex shape.

A hydraulic machine, comprising:

• a Pelton wheel configured to perform a one jet operation;
• a first bearing device configured to support a radial load of a rotary shaft of the Pelton wheel;
• and
• a second bearing device disposed to oppose the first bearing device across the rotary shaft, the second bearing device being configured to support an anti-radial load of the rotary shaft,
• the first bearing device comprising:
• a first water tank configured to store first lubrication water,
• a first bearing pad configured to support a first skirt member provided on the rotary shaft in the first lubrication water from a radial direction,
• a first supporting mechanism configured to slidably support the first bearing pad from the radial direction in the first lubrication water, and
• a second supporting mechanism configured to slidably support the first bearing pad from a bottom portion side in an axial direction in the first lubrication water;
• the second bearing device comprising:
• a second water tank configured to store second lubrication water,
• a second bearing pad configured to support a second skirt member provided on the rotary shaft in the second lubrication water from the radial direction,
• a third supporting mechanism configured to slidably support the second bearing pad from the radial direction in the second lubrication water, and
• a fourth supporting mechanism configured to slidably support the second bearing pad from a bottom portion side in the axial direction in the second lubrication water;
• wherein one of a supporting surface supporting the first bearing pad in the first supporting mechanism and a supported surface supported by the supporting surface in the first bearing pad is formed in a convex shape, and
• wherein one of a supporting surface supporting the first bearing pad in the second supporting mechanism and a supported surface supported by the supporting surface in the first bearing pad is formed in a convex shape,
• wherein one of a supporting surface supporting the second bearing pad in the third supporting mechanism and a supported surface supported by the supporting surface in the second bearing pad is formed in a convex shape, and
• wherein one of a supporting surface supporting the second bearing pad in the fourth supporting mechanism and a supported surface supported by the supporting surface in the second bearing pad is formed in a convex shape,
• wherein a bearing gap of the first bearing pad supporting the radial load is set to a predetermined value, and
• wherein a bearing gap of the second bearing pad supporting the anti-radial load is set wider than the predetermined value.