Pump apparatus

A pump apparatus, comprising:

• a rotational shaft;
• a hub portion mounted to the rotational shaft;
• a centrifugal pump vane mounted to a circumferential surface of the hub portion;
• an annular disc portion mounted to a tip end of the centrifugal pump vane;
• and
• an axial turbine blade mounted to an outer circumferential surface of the annular disc portion,
• wherein a liquid flow passage through which a liquid flowing from a first side toward a second side in an axis direction of the rotational shaft flows into the centrifugal pump vane is formed at a radially inner side of the annular disc portion,
• wherein a gas flow passage through which a gas flowing from the second side toward the first side passes through the axial turbine blade is formed at a radially outer side of the annular disc portion,
• wherein the pump apparatus further comprises:
• a body-side casing which accommodates the hub portion, the centrifugal pump vane, the annular disc portion, and the axial turbine blade rotatably;
• and
• an inlet-side casing fastened to the first side of the body-side casing,
• wherein the inlet-side casing has, formed inside thereof, a liquid introduction passage for introducing the liquid to the centrifugal pump vane, and a gas discharge passage for discharging the gas after passing through the axial turbine blade, the gas discharge passage being formed at a radially outer side of the liquid introduction passage.

A pump apparatus, comprising:

• a rotational shaft;
• a hub portion mounted to the rotational shaft;
• a centrifugal pump vane mounted to a circumferential surface of the hub portion;
• an annular disc portion mounted to a tip end of the centrifugal pump vane;
• and
• an axial turbine blade mounted to an outer circumferential surface of the annular disc portion,
• wherein a liquid flow passage through which a liquid flowing from a first side toward a second side in an axis direction of the rotational shaft flows into the centrifugal pump vane is formed at a radially inner side of the annular disc portion,
• wherein a gas flow passage through which a gas flowing from the second side toward the first side passes through the axial turbine blade is formed at a radially outer side of the annular disc portion,
• wherein a first-side gap is formed between an end surface of the annular disc portion at the first side and a stationary wall,
• wherein a second-side gap is formed between an end surface of the annular disc portion at the second side and the stationary wall, and
• wherein the annular disc portion has a through hole formed therein, the through hole being formed through the annular disc portion along the axis direction of the rotational shaft and bringing the first-side gap or a first-side space communicating with the first-side gap and the second-side gap or a second-side space communicating with the second-side gap into communication.

A pump apparatus, comprising:

• a rotational shaft;
• a hub portion mounted to the rotational shaft;
• a centrifugal pump vane mounted to a circumferential surface of the hub portion;
• an annular disc portion mounted to a tip end of the centrifugal pump vane;
• and
• an axial turbine blade mounted to an outer circumferential surface of the annular disc portion,
• wherein a liquid flow passage through which a liquid flowing from a first side toward a second side in an axis direction of the rotational shaft flows into the centrifugal pump vane is formed at a radially inner side of the annular disc portion,
• wherein a gas flow passage through which a gas flowing from the second side toward the first side passes through the axial turbine blade is formed at a radially outer side of the annular disc portion,
• wherein a second-side gap is formed between an end surface of the annular disc portion at the second side and a stationary wall, and
• wherein the pump apparatus comprises:
• a body-side casing which accommodates the hub portion, the centrifugal pump vane, the annular disc portion, and the axial turbine blade rotatably;
• and
• a labyrinth seal which seals a gap between the annular disc portion and the body-side casing at a position closer to the second side than the second-side gap.

A pump apparatus, comprising:

• a rotational shaft;
• a hub portion mounted to the rotational shaft;
• a centrifugal pump vane mounted to a circumferential surface of the hub portion;
• an annular disc portion mounted to a tip end of the centrifugal pump vane;
• and
• an axial turbine blade mounted to an outer circumferential surface of the annular disc portion,
• wherein a liquid flow passage through which a liquid flowing from a first side toward a second side in an axis direction of the rotational shaft flows into the centrifugal pump vane is formed at a radially inner side of the annular disc portion,
• wherein a gas flow passage through which a gas flowing from the second side toward the first side passes through the axial turbine blade is formed at a radially outer side of the annular disc portion,
• wherein the pump apparatus further comprises a body-side casing which accommodates the hub portion, the centrifugal pump vane, the annular disc portion, and the axial turbine blade rotatably,
• wherein a gas introduction passage for introducing the gas into the axial turbine blade is formed inside the body-side casing, and
• wherein the gas introduction passage is formed partially in a circumferential direction of the rotational shaft.