DE2051611A1 - Liquid flow control device - Google Patents

Description

United Kingdom Atomic Energy Authority, 11, Charles II Street, London S. W. 1 / England

For this filing, the priority is taken from the UK Patent application IJr. 51873/69 of October 22, 1969 and the Priority from the "British Complete Speeification" (Complete description) of October 16, 1970 claimed.

Liquid flow control device

The invention relates to liquid flow control or control devices and deals with the problem of cavitation, especially cavitation, the arises from resistances or throttles, which are introduced into fluid flow channels around the Regulate the pressure drop in the said ducts.

109819/1221

; ·. 205161Ί

In connection with nuclear reactors it is known to introduce resistances or throttles or impedances (or toggles / gags /) into the coolant flow channels which are assigned to the reactor core, so that pressure drop in the channels can be regulated and thereby coolant flow for generating heat in the channels can be related. Known types of throttles were usually of the perforated plate type and these entailed cavitation, particularly with large flows and large pressure drops across the throttles. Cavitation in a restriction can bring vibration with it, which W. Fatigue fracture or failure b4 ± the components; cause kanhy and also noise, which affects the measuring instruments which respond to or are dependent on seirälieverification.

According to the invention, an adjustable cavity-suppressing flow resistance, which is suitable for use in a liquid flow system, has a series of thin barriers which are arranged in flow direction at a distance from one another, each barrier having a plurality of passages atf and adjustable masking means / zageorder 4 ⁸ ^ "which are capable of changing the effective area which each barrier presents to the flow of liquid. . ,, -;

The thin locks can be made of a woven wire mesh be made or consist of a grid.

In an alternative form, an adjustable u cavitation-preventing flow resistance, which ζ * tir Suitable for use in a plus liquid flow system 'is, a series of fixed, iä spacing from one another 'Arranged annular plates, which are spaced spaced windows made of thin woven fabric

Having wire mesh, and a series of associated cover plates, each having flow openings, which with the pensters in the fixed plate, which regarding the sighting of the liquid flow located behind this, are complementary, said cover plates between a position where a maximum effective area of woven wire mesh exposed to liquid flow, and a position where a minimum effective area of woven wire mesh is exposed to the flow of liquid, are rotatable.

An embodiment of the invention suitable for use in a liquid flow channel is, will now be described in more detail with reference to the drawing showing them for example, namely shows

Fig. 1 is an elongated sectional view of a controllable flow resistance valve according to of the invention while

Fig. 2 is a sectional view along the line II-II in Fig. 1 reproduces.

In the drawing, there is a flow throttling valve 1 shown in which a cylindrical pressure vessel consists of a series of fixed annular grid plates 3 having. The grid plates 3 are arranged at equal distances from one another by their reinforced edges 4, soft touch the inner surface of the pressure vessel 2 and at the edges 4 of adjacent panels 3 through Screws 5 are attached. The complete arrangement or Component group of Gdtterplatten 3 is fixed in the pressure vessel by screws 6, which the end grid plate bring into operative connection with a shoulder 7 which is provided in the pressure vessel 2.

TÖÖ819 / 1221

Each grid plate 3 has a shim 8, which includes sixteen equally spaced flow passages 9 incorporated therein or are provided. The flow passages 9 each take a thin woven wire mesh window on. The wire mesh window 10 are thereby secured in place that they are between the shim 8 and an insert plate 11 can be introduced, which is welded into the base plate 8 and with openings is provided, which correspond to the flow openings 9 in the shim 8.

In front of each grid plate 3, with reference to the direction of the liquid flow by arrow A. Indicated, there is a cover plate 12 which has flow openings (not shown) which the woven wire mesh windows 10 in the associated grid plate 3 correspond. The cover plates 12 are mounted on a rotatable shaft 13 which is supported inside the pressure vessel 2 by belt support members 14 and 15 axially supported, which have localizing extensions 16 and 17, which extend towards the inner surface of the pressure vessel 2 extend towards. The shaft 13 is provided with keyways, the keyways with complementary ones Collaborate projections, which are located within the central openings in the cover plates 12 extend. The ends of the shaft 13 are within the end support member Ie 14 and 15 supported by thrust and slide bearings 18.

The shaft 13 is operated by a rotatable spindle 19 which is connected to a rack 20, which engages a gear 21 at the end of the shaft 13, so that the movement of the spindle 19, the shaft 13 with a uniform speed or speed ratio rotates. The spindle 19 extends into a sealed one

109819/12 2.1

Housing 23 into it, in the pressure vessel 2. The sealed Housing 20 prevents leakage of any liquid along the spindle 19

In operation, the rotation of the spindle 19 enables the cover plates 12 to be at one extreme Assume position in which their openings are aligned with the wire mesh windows 10 in their associated grid plates 3 to the maximum presented Flow area through the wire mesh fenoters 10 to give and in the other extreme to take a position in which the cover plate 12 is almost completely cover the wireframe window 10 to make a to result in minimal presented flow area «Between these extremes is a multitude of precisely presented Flow areas reachable. Thus, the shaft 13 only needs to rotate over a range which is softer the cover the wireframe window 10 corresponds.

Setting the range of resistances, which is provided by the valve 1, can be effected in that the spacing of the grid plates 3 is varied or in that it is provided non-uniformly over the length of the spindle 13. In addition, the braid can or fabric of the wire mesh windows 10 can be changed, and the effective area and shape of the windows 10 and the Openings in the cover plates 12 can also be varied. The number of grid plates 3 and the associated cover plates 12 can also be changed.

Dao flow resistance Bventii 1, which above is suitable for use in liquid motive currents .and is of particular use in this context to reduce throttling in the fuel channels hurry ahead which ujsm core assigned to a nuclear reactor which works in the area of fast neutrons and is cooled by liquid sodium.

109819/1221

The invention also relates to modifications of the enclosed patent claim 1 <\ mxlsami $ ^ Jtyß £ Mü & -p & §- <iv ». <. R> - for example and relates above all to all features of the invention, which individually - or in combination - are disclosed throughout the specification and ZeicMtmg.

Claims.

Claims (4)

PATENT LAWYER phone. (0271) 32409 DIPL-ING. ERICH SCHUBERT λι ^ «^ .. ™ *« Postal check accounts: ΚδΙη 106931, Essen 203 « Bank accounts ι Dept .: Patent Attorney Dipl.-Ing. SCHUBERT, 59 Siegen, Eiserner Strasse «227 Deutsche Bank AG., P.O. Box 325 'Siegen and Oberhausen branches (RhId.) 70 117 bottles / a. - 7 - October 20, 1970 Claims Adjustable anti-cavitation flow resistance device, which are suitable for use in a fluid flow system suitable, characterized in that it comprises a series of thin barriers which in the direction of the flow are spaced apart, and that each barrier has a plurality of openings and adjustable Covering means is assigned which are suitable for the effective area which it presents to the liquid flow, to change. 2. Adjustable anti-cavitation flow resistance device according to claim 1, characterized in that the spaced apart barriers are made of woven Wire mesh or mesh are made. 3. Adjustable anti-cavitation flow resistance device, suitable for use in a liquid flow system characterized in that a series is provided by fixed spaced apart annular plates which are spaced apart Have windows made of thin woven wire mesh, and a series of associated cover plates are provided, each having flow openings communicating with the windows EAD ORSGJNAL are complementary in the fixed plate, which is located behind it with respect to the direction of the liquid flow is, said cover plates between a position where a maximum effective area of woven wire mesh exposed to fluid flow, and a position where there is a minimal effective area of woven wire mesh exposed to the flow of liquid are rotatable. 4. Adjustable anti-cavitation flow resistance device according to claim 3, characterized in that the cover plates are attached to a rotatable shaft and capture these or interact with them. 819/1221 Lee on the side