US1727828A - Self-acting siphon - Google Patents

Description

Sept. 10, 1929. w. HEYN 1727,828

SELF ACTING SIPHON Filed June 7, 1927 Patented Sept. 10, 1929.

WERNER HEY'N, 0F HAMBURG, GERMANY.

SEEE-ACTING SICPHON.

Application med June 7, 1927, Serial No. 197,216, and in Germany August 2, 192s,

This invention relates to apparatus of the kind in which an overlow of water through a tube or conduit is utilized to set up Siphon action in said tube by carrying bubbles of air from the tube through the tail-water and discharging same into the atmosphere. In such apparatus as heretofore constructed, such discharge has taken place over the lower edge of the Siphon tube, so that in some 1nstances, as the levelv of the tail water rises, the air bubbles which are projected thereinto by the overfall jet have to traverse an almost vertical path of about 3 meters under water before reaching said lower edge. Hence the exhausting of the air takes a conslderable time and the setting up of the Siphon action is correspondingly delayed. u

The object of the present invention. 1s to provide means for reducing to the minimum possible, the underwater journey of the air bubbles and this, quite irrespective of the level of the tail water. j

The invention is hereinafter described with reference to the accompanylng drawings, in whichz- Figure 1 is a central vertical sectlon of one form of improved Siphon according to the invention;

Figure 2 is a sectional v1ew taken on the line a-b of Figure 1;

Fi re 3 is a view, similar to Figure 1, of a di erent constructional form of Siphon;

Figure 4 is a sectional view on an enlarged scale of one of the outlet ledges of Figure 3 and Figure 5 is a sectional view taken on the line c-d of Figure 4.

The means according to this invention consists in the employment of several submerged outlet ledges or recesses T or T1, arranged above and adjacent to each other, the several ledges or recesses either running round the inner wall of the outfall leg of the Siphon in a horizontal plane as shown at T in Figures 1 and 2 or arranged as illustrated in Figure 3, that is to say, parallel with the back wall and on the inner side of the outer wall of the outfall leg. The ledges T1 runningparallel with the back wall are arranged at a short distance from the said wall, ex-

tending across the leg between and supported by the two side walls, pipes L therefrom being led through the side walls or the outer wall, while the ledges T in the outer ,Wall are of similar' construction to those illustrated in Figures 1 and 2.

Each of these outlet ledges, when submerged by the rise of the tail water in the Siphon, constitutes a partition wall between the Siphon chamber and the outer air, so that the overfall jet can expel the air bubbles from the Siphon chamber, through several of the outlet ledges simultaneously. The air from the bubbles collecting at each individual ledge reaches the outer air by a separate pi e L..

ach of the pipes L terminates either in a flap-valve, with a vertically depending flap L1, as shown in Figures 1 and 2, or, after passing over the summit of the Siphon, ends in a chamber A, shut off from the external atmosphere and into which a pipe R, open at both ends, enters as far as the level of the head water in the said chamber A, see Figure 3. Both the pi es R and the overfall crests can be adjusta ly constructed, and are therefore capable of being adapted to different head water levels, for example, summer and winter levels.

To reinforce the Suction at the start of the 80 action of the Siphon, one or two Side siphons are provided in the lateral walls of the main Siphon, with their horizontal overllow edge running at right angles to the crest of the main overfall at an elevation corresponding to that of the main overflow crest, and there are collecting channels S behind the horizontal overfiow edge of the Side Siphon or siphons, which collect the overfall water and discharge it into the tail waters. When the 90 head Water level rises above the overflow point inside the Siphon chamber the water at first flows in a thin layer over the crest of the main overfall and over the horizontal overflow edge of the auxiliary Side Siphon or 95 siphons which corresponds in height to the overflow crest of the main Siphon. The water thus flowing into the channel S of the side Siphon or siphons collects in the channel and forms a strong jet which by virtue of the 100 slight inclination of the bottom of the chanbe made of the wedge K, 4to split up an oveinel is directed against the submerged ledges reinforcing the suction at the start of the overflow.

The method of operation of a siphon working Awitha pipe L termina in 'a vchamber A (Figure 3) will also now particularly described.

Supposing that the level of the head-.waterV within the ipes L commumcating with them,

. and practical experience shows that this overpressure is sui'cient to force the water in the correspondin chambers A, which has also risen b 1 cm., own again to the height of the ove ow point, so that the air bubbles can escape into the atmosphere, by the proper pi R. Y

Itsis to be understood that each pipe L terminates in a separate chamber A which has its appropriate pipe R. The pipes L of those outlet ledges which are not submerged in the tail water are open to the siphon chamber and closed to atmosphere by the water seal in the respective chambers A. Hence, once the siphon action has been started by the escape of water-borne air from the Siphon chamber as above described,'the air in the pipes of the unsubmei'ged ledges is rarefied to the same extent as that in the Siphon chamber. Thus, in the neighborhood of the siphon inlet there will be, at the commencement of the Siphon action, three -dilerent water levels, namely the head water level, the slightly lower level in the chamber or chambers A appertaining to the submerged ledge or ledges, and the slightly higher level in those chambers A ap rtainin to the unsubmerged ledges, prodllized by t e rarefaction just referred to. As this low pressure subsists in these chambers A and pipes L at the moment when the respective ledges T or T1 in turn become submerged by the rise of the tail water, the passage of the air thereinto is facilitated over ressure beintg there-' after produced which orcos down e4 level of the water in the chamber A suil'iciently to allow the compressed air to escape through the pipes R. In this way, the siphonic action is progressive, being augmented as the low increases, and the Siphon will carry away a greater or less volume of water, depending on the volume flowing to it each second from the head race. l.

In order to accelerate the suction, use can Vber A, pipe L and outlet ledge fall jet that is thicker than about 0.16 meter, and to divert'it to the neighbourhood of the outlit; ledges in the- Asiplion wall W (Figure When the ow of water to the si hon ceases and-the level of the head water alls to the level of the overflow point, air is admitted to the siphon tube through the pipe R, chainor T1, siphon action being thus gradually checked. In many cases, however, an arr ement such as that illustrated in Figure 1, will be found indispensable.

Having described m invention, I declare that what I claim and esire to secure by Letters Patent is 1. In a self-acting siphon such as described, -a plurality of outlet leddges in the lower part arranged one above, an adjacent to, another adapted to be submerged by the tail water at various levels of same and to discharge the A simultaneously through pipes communicating with a plurality said outlet led air carried into the tail water by the ove all jet.

2i In a self-acting Siphon such as described, a plurality of outlet ledges in the lower part arranged one above, and adjacent to, another, an air passage adapted to connect each of said outlets with the atmosphere, a water sealed chamber through which said connection to atmowhere is effected, and means determining the sealing and unsealing of said chamber according to the level of the head water.'

3. In a self-acting siphon such as described, a plurality of outlet ledges in the lower part arranged one above, and adjacent to, another adapted to be submerged by the tail water and to discharge from a plurality of said outlets simultaneously air carried into the tail water b the overfall jet, and a wedge-shaped br ater in the path of the overfall jet adapted to divert said jet towards a pluralityof the outlet ledges.-V

4.' In a self-'acting siphon such as described, a plurality of outlet l in the lower part arranged one above, an adjacent to, another adapted to be submerged by the tail water and to 'discharge from a plurality of said outlets simultaneously air carried into the tail water by the overfall jet, at least one auxiliary side si hon within the main siphon, and collecting c annels adapted to augment the overfall jet and guideit towards the outlet ledges. v

In testimony whereoI have aixed my signature hereto.

DmING. WERNER HEYN.

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