Mechanical automatic tilting weir with selfadjusting lowering of

Details Mechanical automatic tilting weir with selfadjusting lowering of Mechanical automatic tilting weir with selfadjusting lowering of

1990-03-02

1992-06-30

Reese, Randolph A.

Hydraulic and earth engineering

Fluid control, treatment, or containment

Flow control

405 96, 405100, 405104, 405106, E02B 728

Patent

active

051257661

DESCRIPTION:

BRIEF SUMMARY
The invention concerns weir gate (1) tilting on a horizontal axis that maintains mechanically a preset weirlevel entirely automatically but can be adjusted thus that in times of a larger flow of water even a lowering of the preset weirlevel is obtained.
The operation is based on a balanced equilibrium between the hydraulic forces exercising on the gate (1) and the resisting forces of 1 or 2 floating counterweights (4).
The horizontal pivot (2) is mounted sligtly below the centre of the gate (1). The forces are transmitted by means of an adjustable connection (13), a cable (14), an adjustable drum (11), a disk (10) welded on a shaft (7) and a cable (6).
A grate (15) prevents floating treebranches and waterplants to get in between the underside of the gate (1) and the threshold-beam (20). Gate (1) and grate (15) are hanging in a spindle- or lifting structure (16) which permits the adjustment of different weirlevels.
Most of the presently used weirs, capable of complete, automatic holding of the desired weirlevel, all need a mechanism electrically or hydraulically driven. The disadvantage of these weirs is that they are costly to install, especially when there is no electricity available in the vicinity.
In the past weirs have been designed which have an automatic level-control based on the hydraulic forces exercised on the gate with or without counterweights.
Weirs of this type are known from the French paper FR-A-645.345 and FR-A-2.033.187. The main disadvantage is that these weirs only function for one specified weirlevel. When the counterweight of FR-A-645.345 is changed to alter the weirlevel the whole characteristic of the weir is disturbed. When the weirgate is partially opened, dirt and/or branches can hook or get stuck between the bottom of the weirgate and the threshold, which results in blocking the operating of the weir.
Furthermore, the weir reacts slowly. The weir of FR-A-2.033.187 will discharge large volumes of water when the downstream level rises. This can lead to open the gate completely and the weirlevel falls down under the wished level. The operation of the weir depends on the functioning of a relatively small outlet which can easily be blocked by leaves or other dirt. Blocking this outlet will result in a faulty operation of the weir.
The subject invention is free from the above mentioned disadvantages and above that the weir operates without external energy supply.
FIG. 1 shows the weir cut through longitudinal.
FIG. 2 shows the weir cut cross.
FIG. 3 shows a version of the threshold.
The weir consists of five major parts, namely a tiltable weirgate (1), one or two floating counterweights (4), a leadscrew or lifting construction (2), a grate (15) and a threshold-beam (20). The gate (1) turns with a horizontal fixed shaft (2) in a bearing (3) placed on both sides next to the gate (1) and is vertically adjustible. This horizontal shaft (2) is mounted about 0.4 of the height of the gate measured from the underside. Presumed is that the weirlevel is equal or slightly higher than the upperside of the gate (1). These assumptions results in that the gate (1), only by the hydraulic forces, is nearly in equilibrium. The second essential part of the invention is the use of 1 or 2 floating counterweights (4) placed upstream of the weir, and near the gate (1).
These floating counterweigts (4) are hanging in an enclosure (5) by a steel cable (6) to a horizontal shaft (7), which is positioned above the waterlevel. The cable is wound around the shaft (7), in the way the cable is wound on a drum and fastened to a shaft (7). This shaft rotates on both sides in a bearing (8) mounted in the side of enclosure (5) near the gate (1).
In the same side is an opening (9) placed amply below weirlevel which provides that the waterlevel in the enclosure (5) is always equal to the level in the canal. Instead of these openings (9) to the water near the gate (1) it is also possible to connect the enclosures (5) by way of a tube, well below the watersurface, with a point of the upstream canal at a certain distance. T

REFERENCES:
patent: 1497618 (1924-06-01), Vonka
patent: 1738051 (1929-12-01), Harker
patent: 2322846 (1943-06-01), Growden et al.
patent: 2966777 (1961-01-01), de Brito Filho
patent: 4877352 (1989-10-01), Tuttle et al.

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