Flat throttling gate

Details

Inventors: Brcar, Anton;
Assignee: Titovia Zavodi Litostroj Ljubljana n.sol.o. (Ljubljana, YU)
Primary Examiner: Taylor; Dennis L.
Assistant Examiner:
Attorney, Agent or Firm: Ross; Karl F., Dubno; Herbert

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 In the withdrawn position of the valve body, the throttling cutout boundary, the masks and the wall of the draft tube define a circular flow cross section.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.

DETAILED DESCRIPTION What we claim is: 1.
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.
2.
The gate defined in claim 1 wherein said edge of said cutout of said body and said masks conform to circular arc segments of a circle having a diameter equal to the diameter of said draft tube at the region thereof at which said gate is installed.
3.
The gate defined in claim 2 wherein said edge of said cutout is fitted to the edges of said ramps.
4.
The gate defined in claim 2 wherein said edge of said cutout is contoured to lie flush with the section of the draft tube at the place of installation of said gate.
5.
The gate defined in claim 2 wherein said edge of said cutout is inclined to the section of the draft tube at the place of installation of said gate therein

Related patents

	Paint brush holder What is claimed is: 1. A holder for paint brushes consisting of a platform to rest over the rim of a paint can, clamping members extending downwardly from the outer edge ...
	Wide-folding hinge What is claimed is: 1. A wide-folding, linearly-hinged assembly of sheet members secured to each other in areas other than in the vicinity of the hinge comprising: an ...
	Package and storage container for diskettes INCLUDING DRAWING A detailed description of a preferred embodiment of the invention is set forth hereafter. The drawings referred to include the following figures: FIG. ...
	Article including an integrally molded ball and socket type hinge This invention relates to an article having two sections articulated to one another by at least one hinge. The hinge is of the ball and socket type, and includes a ...
	Tamper-evident container and closure The present invention provides a two-level tamper-evident quality in a container and closure combination and embraces the location of a tear strip on either the closure ...
	Two-piece can construction The present invention utilizes the cup portion wherein one end of the can is integral with the sidewall and wherein the interface of this one end with the sidewall is ...
	Process for secondary recovery OF THE INVENTION Prior to practicing the process of this invention it is sometimes desirable to open up a communication path through the formation by a hydraulic ...
	Composition of a conductive ceramic glaze and improved method of forming same OF THE PREFERRED EMBODIMENTS While the invention is particularly pointed out and distinctly claimed in the concluding portions herein, a preferred embodiment is set ...

0.064
Archive: All patents - Links Copyright (c)2006 Eipa-patents.org - All rights reserved