US3643443A - Automatic constant downstream level gate - Google Patents

Automatic constant downstream level gate Download PDF

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Publication number
US3643443A
US3643443A US102286A US3643443DA US3643443A US 3643443 A US3643443 A US 3643443A US 102286 A US102286 A US 102286A US 3643443D A US3643443D A US 3643443DA US 3643443 A US3643443 A US 3643443A
Authority
US
United States
Prior art keywords
downstream
container
opening
gate
float
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US102286A
Other languages
English (en)
Inventor
Philippe Alexandre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cegelec SA
Original Assignee
Cegelec SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cegelec SA filed Critical Cegelec SA
Application granted granted Critical
Publication of US3643443A publication Critical patent/US3643443A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
    • E02B7/20—Movable barrages; Lock or dry-dock gates
    • E02B7/205—Barrages controlled by the variations of the water level; automatically functioning barrages

Definitions

  • Gates of the type with which this invention is concerned are usually of unit construction and mounted for pivotal movement above a main pivot.
  • the unit is provided with an up stream gate apron centered on its main pivot, and a downstream float for controlling the operations of the gate in maintaining the downstream water level.
  • the primary purpose of the instant invention is to provide an improved means for dampening the oscillations of the gate during the latters operation ad for sheltering the downstream float thereof from the effects of the tailrace and from foreign bodies carried by the tailrace.
  • FIG. l is a schematic view of an automatic constant downstream level gate having its downstream float encased in a container embodying the invention.
  • W6. 2 is a partial view of the bottom end of the container on an enlarged scale.
  • the automatic gate unit which is shown in its fully opened position in FIG. 11 of the drawings, comprises a frame arm 3 which extends upstream from a fulcrum 2 about which the whole of the gate pivots and on the outer upstream end of which is mounted a sector-shaped apron 1 radially disposed to the pivotal axis 2.
  • the unit also includes a hollow sector float 4 which is centered on the pivotal axis 2 so as to be in opposing torque to the apron i.
  • the gate is mounted in a canal 12 so that the apron ll coacts with a sill lll formed in such canal to control the flow of water so that there is maintained in the tailrace 13 downstream of the gate a constant level N which is the elevation of the main pivot 2 of the gate.
  • the gate is balanced by a weight 7 adjustably positioned on a post 8 carried by the frame arm 3 so that when the downstream water level N is at the elevation of the gate pivotal axis 2 and the gate is completely closed, the torque generated by the hydraulic thrust on the float 4 will balance the torque generated by the weight of the gate. So long as the condition is maintained the gate will remain closed. W hen, however, the downstream water level N of the tailrace falls, the gate will automatically, immediately open to permit a larger discharge therethrough sufficient to restore the water level of the tailrace to the level N.
  • the float 4 is immersed in a fixed container which projects above the tailrace level N and which is carefully matched in configuration to that of the float so that the chamber defined thereby is only slightly greater in volume than the volume displaced by the float.
  • the container 5 is provided with a transverse slot or opening 6 affording communication between the bottom of the chamber therein and the tailrace so that the water can flow into the container chamber and be discharged therefrom during the oscillating movements of the float 4 in the operations of the gate.
  • the opening 6 is formed by a space between the lower end of the downstream wall of the container and the base or bottom wall 9 of such container.
  • the base 9 of the container 5 has an extension 10 projecting downstream beyond the opening 6 in downwardly inclined relation to the current flow. This extension 10 shelters the slot 6 from the current F produced by the apron 1 and the sill 11. This result is accomplished because the downwardly inclined extension It) creates in the tailrace a zone 15 of relative negative pressure in front of the opening 6.
  • This depressurizing of the zone 15 in front of the opening which may be termed a suction effect, causes the level N in the float container or tank 5 to be slightly lower than the level N of the tailrace, improves the dampening of the float 43 by the container 5, and improves the stability of the gate for equal ef fective adjustments of the decrement of the gage (the term decrement being here used to designate that variation in the downstream or tailrace level which causes the gate to move over the full range of travel for which it was designed and ad justed).
  • the thus created depressurized zone has been found to provide a further advantage in that it prevents the movement of foreign bodies that may be carried along by the current through the opening 6 and consequently the entry of such bodies into the container 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Control Of Non-Electrical Variables (AREA)
  • Barrages (AREA)
US102286A 1970-01-05 1970-12-29 Automatic constant downstream level gate Expired - Lifetime US3643443A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7000464A FR2076249A5 (enExample) 1970-01-05 1970-01-05

Publications (1)

Publication Number Publication Date
US3643443A true US3643443A (en) 1972-02-22

Family

ID=9048704

Family Applications (1)

Application Number Title Priority Date Filing Date
US102286A Expired - Lifetime US3643443A (en) 1970-01-05 1970-12-29 Automatic constant downstream level gate

Country Status (5)

Country Link
US (1) US3643443A (enExample)
JP (1) JPS5220780B1 (enExample)
ES (1) ES378305A1 (enExample)
FR (1) FR2076249A5 (enExample)
GB (1) GB1316855A (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4963057A (en) * 1989-01-03 1990-10-16 Societe Anonyme Dite: Alsthom Fluides Sluice gate for automatically regulating a level
US5516230A (en) * 1994-05-05 1996-05-14 Bargeron; Richard J. Gate for controlling upstream water level

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2168117A (en) * 1935-05-14 1939-08-01 Neyret Beylier & Piccard Picte Apparatus for controlling liquid levels

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2168117A (en) * 1935-05-14 1939-08-01 Neyret Beylier & Piccard Picte Apparatus for controlling liquid levels

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4963057A (en) * 1989-01-03 1990-10-16 Societe Anonyme Dite: Alsthom Fluides Sluice gate for automatically regulating a level
US5516230A (en) * 1994-05-05 1996-05-14 Bargeron; Richard J. Gate for controlling upstream water level

Also Published As

Publication number Publication date
ES378305A1 (es) 1973-02-01
JPS5220780B1 (enExample) 1977-06-06
FR2076249A5 (enExample) 1971-10-15
GB1316855A (enExample) 1973-05-16

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