Flat throttling gate
AssigneeTitovia Zavodi Litostroj Ljubljana n.sol.o.
InventorAnton Brcar
Life of this patent
Estimating the term…
Abstract
A flat throttling gate for bulb-type turbines and the like which is installed in a draft tube of the turbine. The gate has a central cutout of arcuate configuration flanked by a pair of ramps which cam a pair of masks into respective chambers flanking the guide slot for the slide body. Actuating mechanisms, e.g. springs, bias the masks against the valve body. In the withdrawn position of the valve body, the throttling cutout boundary, the masks and the wall of the draft tube define a circular flow cross section. In the inserted position of the valve body, a narrow flow cross section is provided between the wall of the draft tube or a lining thereof and a boundary of the cutout.
Claims5
A throttling gate for throttling the flow of water in the draft tube of a water turbine, comprising:
- a flat valve body displaceable transversely to the draft tube toward and away from a wall thereof, said draft tube being formed with a guide slot for said body;
- guiding and supporting rolls movably mounting said body for displacement thereof transversely to the axis of said tube in said slot;
- means defining a pair of chambers flanking said body in a fully inserted position thereof in said slot, said body being provided with symmetrical ramps on opposite edges thereof and with a cutout intermediate said ramps defining an arcuate throttling edge;
- respective swings pivotally mounted in said chambers for swinging movement about respective axes parallel to the axis of said draft tube and perpendicular to the direction of displacement of said body, said swings being formed at free ends thereof with respective masks conforming to the contours of said draft tube and defining a smooth annular contour with said wall of said draft tube, and the edge of said cutout;
- respective control rollers on said swings engageable by said ramps and displaceable by said ramps outwardly into a fully recessed position within the respective chamber upon advance of said body toward said well of said draft tube;
- and
- respective actuating mechanisms biasing said swings toward said body and said control rollers into engagement with said ramps.
Dependencies are inferred from the claim text.