| CPC F04D 13/086 (2013.01) [F04B 23/021 (2013.01); F04B 45/02 (2013.01); F04D 13/16 (2013.01); F04D 29/086 (2013.01)] | 8 Claims |
|
1. A sealing member for sealing an opening end of a cylindrical pump column configured to accommodate a pump configured to be submerged in a handling liquid and for suspending and supporting the pump when the pump is raised and lowered in the pump column, the sealing member comprising:
a head plate having a through hole extending in a vertical direction and attached to the opening end so as to close the opening end;
a lift shaft disposed through the through hole and raised and lowered between a raised position and a lowered position when the pump is raised and lowered;
a bellows member configured to extend and contract in an axial direction of the lift shaft corresponding to the raising and lowering of the lift shaft; and
a bellows sealing member, wherein
the bellows member includes:
a bellows tube covering an outer peripheral surface of a protruding lower portion of the lift shaft protruding downward from the head plate;
a first attaching member disposed contiguously to a lower end of the bellows tube and attached to the protruding lower portion of the lift shaft; and
a second attaching member disposed contiguously to an upper end of the bellows tube and attached to a lower surface of the head plate, adjacent to the through hole,
wherein
the second attaching member comprises a structure that includes:
a tube portion having a cylindrical shape, and
a plate-shaped flange portion that protrudes outwards from the tube portion in a radial direction of the tube portion,
the tube portion extends above an upper surface of the plate-shaped flange portion and has an outer diameter and an inner diameter,
the inner diameter corresponding to a diameter of the through hole,
the head plate includes a fitting portion that comprises a cylindrically shaped recess adjacent the through hole and a plate-shaped recess adjacent the cylindrically shaped recess, configured such that the tube portion fits into the cylindrically shaped recess and the plate-shaped flange portion fits into the plate-shaped recess when the second attaching member is attached to the lower surface of the head plate,
the bellows sealing member disposed between the first attaching member and the protruding lower portion of the lift shaft,
the first attaching member disposed below the lift shaft,
the bellows sealing member abuts on an upper surface of the first attaching member and a lower end surface of the lift shaft and liquid-tightly seals between the upper surface of the first attaching member and the lower end surface of the lift shaft, and
the lower end surface is a horizontal surface.
|