A liquid pressurizing apparatus, comprises a tank provided on a device installation surface for storing liquid so that a fluid level is located above the device installation surface; and a vertical pump including a suction port connected to the tank, multi-stage impellers arranged in a vertical direction, and a discharge port for discharging the liquid passing through the multi-stage impellers. The multi-stage impellers include a first stage impeller positioned at the lowest part of the multi-stage impellers and being configured such that the liquid from the suction port flows into the first stage impeller. The first stage impeller is disposed below the device installation surface.

An electric pump provided with a pump unit configured to discharge working oil by being rotationally driven by an electric motor includes: a drive shaft configured to transmit rotational driving force from the electric motor to a rotor of the pump unit; a rotation-detection shaft provided coaxially with the drive shaft, the rotation-detection shaft being configured to be rotated together with the rotor; and a rotation detector unit configured to detect rotation of the rotation-detection shaft. The rotation-detection shaft has: an engagement portion configured to engage with the rotor; and a detection-target portion facing the rotation detector unit, and an outer diameter of the detection-target portion is set so as to be larger than an outer diameter of the engagement portion.

An electric pump provided with a pump unit configured to discharge working oil by being rotationally driven by an electric motor includes: a drive shaft configured to transmit rotational driving force from the electric motor to a rotor of the pump unit; a rotation-detection shaft provided coaxially with the drive shaft, the rotation-detection shaft being configured to be rotated together with the rotor; and a rotation detector unit configured to detect rotation of the rotation-detection shaft. The rotation-detection shaft has: an engagement portion configured to engage with the rotor; and a detection-target portion facing the rotation detector unit, and an outer diameter of the detection-target portion is set so as to be larger than an outer diameter of the engagement portion.

A pumping unit operable to pump water has a longitudinal pumping unit axis. A pump shaft engages shaft bearings in a pump shaft housing. A drain conduit includes a drain conduit inlet segment, a drain conduit ascending segment, and a drain conduit terminal segment. The drain conduit inlet segment has a longitudinal drain conduit axis disposed at an obtuse angle to the longitudinal pumping unit axis. The drain conduit ascending segment is disposed at an obtuse angle to the drain conduit inlet segment. The drain conduit terminal segment is disposed at an obtuse angle with respect to the drain conduit ascending segment and is disposed at a level above the shaft bearing. Accordingly, backflow water flowing through the drain conduit terminal segment, the drain conduit ascending segment and the drain conduit inlet segment, respectively, flows into the pump shaft housing to contact and cool the shaft bearing.

A molten metal pump having a base member defining a pumping chamber is provided. The pumping chamber includes an opening in each of a top surface and a bottom surface of the base member. An impeller is disposed in the pumping chamber and is configured to draw molten metal through the opening in the bottom surface and expel the molten metal through an outlet in the base member. A flow diverter is disposed above the opening in the top surface.

A molten metal pump having a base member defining a pumping chamber is provided. The pumping chamber includes an opening in each of a top surface and a bottom surface of the base member. An impeller is disposed in the pumping chamber and is configured to draw molten metal through the opening in the bottom surface and expel the molten metal through an outlet in the base member. A flow diverter is disposed above the opening in the top surface.

A fan frame body structure includes a first frame body. The first frame body has a first upper end, a first lower end, a first frame wall and a first main flow way. The first main flow way passes through the first frame body and is formed with a first main inlet and a first main outlet respectively at the first upper end and the first lower end. A first subsidiary flow way is disposed in the first frame wall. The first subsidiary flow way is in parallel the first main flow way. The first subsidiary outlet is positioned at the first upper end of the first frame body in flush with and in adjacency to the first main inlet.

A fan frame body structure includes a first frame body. The first frame body has a first upper end, a first lower end, a first frame wall and a first main flow way. The first main flow way passes through the first frame body and is formed with a first main inlet and a first main outlet respectively at the first upper end and the first lower end. A first subsidiary flow way is disposed in the first frame wall. The first subsidiary flow way is in parallel the first main flow way. The first subsidiary outlet is positioned at the first upper end of the first frame body in flush with and in adjacency to the first main inlet.

A vertical member, which is preferably a support post used in a molten metal pump, includes a ceramic tube and tensioning structures to add a compressive load to the tube along its longitudinal axis. This makes the tube less prone to breakage. A device, such as a pump, used in a molten metal bath includes one or more of such vertical members.

A vertical member, which is preferably a support post used in a molten metal pump, includes a ceramic tube and tensioning structures to add a compressive load to the tube along its longitudinal axis. This makes the tube less prone to breakage. A device, such as a pump, used in a molten metal bath includes one or more of such vertical members.