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US5360290: Underground drainage facility, vertical-shaft multi-stage adjustable vane pump, and method of running drainage pump

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Filing Information

Inventor(s) Masayuki Yamada · Saburo Maru · Sumio Sudo ·
Assignee(s) Ltd. Hitachi ·
Attorney/Agent(s) Antonelli, Terry, Stout & Kraus ·
Primary Examiner Dennis L. Taylor ·
Application Number US7988755
Filing date 12/10/1992
Issue date 11/01/1994
Predicted expiration date 12/10/2012
U.S. Classifications 405/52  · 137/236.1  ·
International Classifications E02F 100  ·
Kind CodeA
International Classifications 40536;52;43;37;80;53 ·
Foreign Priority JP3330301 - 12/13/1991 · JP4106673 - 04/24/1992 ·
19 Claims, No Drawings


Abstract

An underground drainage facility including a drainage pump adapted to be operated if an inflow water channel is constructed as a closed channel. Overflow weirs in water channels such as rivers or the like on an inflow side are less than a maximum water level. A vertical-shaft multi-stage adjustable-vane impeller is used as a drainage pump. Consequently, even a drainage pump of a high pressure head and large capacity can perform a waiting running and accommodate a variation in a quantity of inflowing water to the drainage facility.

Independent Claims | See all claims (19)

  1. 1. An underground drainage system including a large capacity floodway and small inclination provided at a substantial depth below a surface of the ground into which floodway drainage flows from various drainage water channels on the ground surface and in a vicinity of ground surface through vertical shafts, and from which floodway the drainage is drained from a pump station provided at a part of said floodway, into rivers, a sea or the like, and a pump in the pump station disposed at a location of a larger depth from the ground surface than a rated pressure head of the pump so that an estimated quantity of water can be drained with the floodway in a state of a closed channel.
  2. 3. An underground drainage facility comprising an underground large water channel provided for causing inflow water to flow down, inflow vertical shafts for introducing water from rivers, covered conduits, flood control channels and the like to said underground water channel, ventilation holes provided in said underground water channel, a pump well arranged on the downstream end of said channel, a pump well arranged on the downstream end of said underground large water channel, and a pump provided in said pump well, wherein said pump is adapted to drain an estimated quantity of water with an inflow water channel in a state of a closed channel, and wherein said pump will not run in no-discharge operation with the inflow water channel in a state of an open channel.
  3. 6. An underground drainage comprising, an underground large water channel provided for causing inflow water to flow down, inflow vertical shafts for introducing water from rivers, covered conduits, flood control channels to said underground water channel, ventilation holes provided in said underground water channel, a pump well arranged on the downstream end of said channel, a pump well arranged on the downstream end of said underground large water channel, and a pump provided in said pump well, wherein said pump is adapted to drain an estimated quantity of water with an inflow water channel in a state of a closed channel, in a state of a closed channel, said pump does not run in a no-discharge operation with the inflow water channel in a state of an open channel, said pump provided in said pump well is a vertical-shaft multi-stage adjustable-vane pump comprising a plurality of vertical-shaft pump stages connected to each other on the same axis, at least one stage of said vertical-shaft multi-stage pump has an adjustable vane impeller supported such that a vane angle is variable with respect to a drive shaft of said vertical-shaft multi-stage pump and a vane angle operating mechanism is provided for rotating said adjustable vane impeller about a support shaft to operate the vane angle, all of said stages of said vertical-shaft multi-stage pump are adjustable vane pumps, and a drive shaft of each of said adjustable vane pump stages is hollow, said vane-angle operating mechanism includes an operating shaft extending through a hollow portion of said drive shaft, and a link mechanism is connected to said operating shaft and said adjustable-vane impeller converts an axial motion of said operating shaft into a vane-angle rotational motion of said adjustable-vane impeller, and wherein the drive shaft and the operating shaft of each of said stages are connected to each other.
  4. 7. An underground drainage facility comprising, an underground large water channel provided for causing inflow water to flow down, inflow vertical shafts for introducing water from rivers, covered conduits, flood control channels to said underground water channel, ventilation holes provided in said underground water channel, and a pump well arranged on the downstream end of said channel, a pump well arranged on the downstream end of said underground large water channel, and a pump provided in said pump well, wherein said pump is adapted to drain an estimated quantity of water with an inflow water channel in a state of a closed channel said pump will not run in a no-discharge operation with the inflow water channel in a state of an open channel, said pump provided in said pump well is a vertical-shaft multi-stage adjustable-vane pump comprising a plurality of vertical-shaft pump stages connected to each other on the same axis, at least one stage of said vertical-shaft multi-stage pump has an adjustable vane impeller supported such that a vane angle is variable with respect to a drive shaft of said vertical-shaft multi-stage pump and a vane angle operating mechanism is provided for rotating said adjustable vane impeller about a support shaft to operate the vane angle, at least an upper stage of said vertical-stage multi-stage pump is an adjustable vane pump, of which a drive shaft is hollow and said vane-angle operating mechanism includes an operating shaft extending through a hollow portion of said drive shaft and a link mechanism connected to said operating shaft and said adjustable-vane impeller converts an axial motion of said operating shaft into a vane-angle rotational motion of said adjustable-vane impeller, and wherein drive shafts of the respective stages of said vertical-shaft pump are connected to each other, and the operating shafts of the adjustable vane pump stages on the side of the upper stage are connected to each other.
  5. 11. An underground drainage facility comprising an underground inflow water channel provided for causing inflow water to flow down, inflow vertical shafts for introducing water from rivers, covered conduits, flood control channels to said underground inflow water channel, ventilation holes provided in said underground inflow water channel, a pump well arranged at a downstream end of said underground inflow water channel, a small capacity and high lift pump provided in said pump well which is capable of draining an estimated quantity of water within underground inflow water channel in a stage of an open channel and runs in a drainage waiting period, and a large capacity low lift pump in said pump well which is capable of draining an estimated quantity of water within said underground inflow water channel in a closed channel state.
  6. 17. An underground drainage facility comprising an underground inflow water channel for causing inflow water to flow down, inflow vertical shafts for introducing water from rivers, covered conduits, flood control channels to said underground inflow water channel, ventilation holes provided in said underground inflow water channels a pump well arranged at a downstream end of said underground inflow water channel, a pump provided in said pump well, wherein the further upstream of said pump of said inflow water channel, the greater the inflow vertical shafts are with respect to a quantity of inflowing water.
  7. 18. A method of operating a drainage pump in a high-depth underground drainage facility including a large capacity floodway arranged at a small inclination provided at a great depth below a ground surface level into which floodway drainage flows from various drainage water channels on the ground surface and in a vicinity of the ground surface through vertical shafts, and from which floodway the drainage is drained from a pump station provided at a part of said underground floodway, into rivers, a sea or the like, wherein drainage is effected by a drainage pump when said underground floodway is in a state of a closed channel.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US3626823 ANDREW A TOTH Toth Feb 1970
US3919848 SULLIVAN A EUGENE Sullivan Nov 1975
US4457646 LAESCH DANIEL A Laesch Jul 1984
US4890955 Innotag Inc. Mercier Jan 1990
US4997312 REGAN PATRICK Regan Mar 1991

Patent Family

Document NumberAssigneeInventorsIssue/Pub Date
US5360290 Ltd. Hitachi Masayuki Yamada et al. Nov 1994
US5624226 Ltd. Hitachi Masayuki Yamada et al. Apr 1997