US1770340A - Siphon spillway - Google Patents

Description

'July 8, 1930. LAWA'CZECK 1,770,340

S IPHON SPILLWAY Filed June 20, 1927 /n vet) for. Franz Zawaezeck water in the river consumes far more head tion andforming part thereof a retaining -Pa.tented July 8, 1930 i a I 2 g 7 11 770 349 FRANZ LAWAGZECK, on MUNICH, rGE BIM'ALN Y SIPfHON SPILLWAY i Application filed June 2-0, 1927, SerialvNo. zoousaana in German June 21, 1926.

My invention refers to the art, of hydraulic lerel predetermined for mean and low water engineering and provides means for utiliz-l is overstepped,by quickly and automatically ing to the utmost extent the head and water exhausting air from the siphon; In. conse-' power of flowing waters, for instance rivers, ,quence of this arrangement the edge of the" 5 at mean andlow water, whi'le avoiding the weir no more determines the head and'the 55 danger from: high'water. I p starting at thesiphon and the great advanf' In the utilization of the head and hytage is obtained that the top edge of the Weir draulic power of rivers one is constantlyconneed not extend exactly in a'lioriZontalvline: fronted with the problem, how to deal'with- In spite thereof the adjusting ofthewater; re the water in rivers provided with weirs-or level is eiiected in a more sensitive"manner 60 retaining dams in such manner that the head than in those cases where the water level is at mean and low water will correspond apmade dependent from th e height' Qf-theweir proximately to the usualhead at high water edge." 1' further importantadvanta ge rer without allowing the head at high water to 1 sults from the daming up of low and mean 15 get so high as to allow the water tooverfiow water to the high water level, because now 5 the banks below the wei the cross-sectional area of the river bed at The present invention in dealing with this high waterywhich is utilized only during the problem makes use of the well known sipbons short period of high water, now constitutes extending across the top of the'weirs for cona powerful accumulator for normal opera- 2e veying across the weir the surplus water to tion so that'atleast one daily make up .for the 79 be disposed of during the periods *of high surplus output of the power's'tation'cannow water. 7 I I beacc umulated in thespace of the river bed,

As is well known high water in consewhich was hitherto not'utilized; quence of the greater velocity of flow of the In the drawings affixed to this specifica- F by friction and eddying per unit of cross-. dam embodying my invention "is illustrated sectional area than the comparatively small 'diagramm'atically by way of example. quantity of mean and low water. Therefore In the drawings, v 1. hitherto the overflow edge of the retaining r Fig. l is a sectionof the-dam withfth'e '30 dams had to be disposed at a considerably siphon extending across fit a ndwith auto-f, lower level thanjwould be admissible for low matic means. for "setting same-operating. and mean'water in order to prevent the water Fig. 2 is a diagram showing an' improved from overflowing the banks in front of the gonstrugfion' f the, d' j f tu tin th weir in spite of the materially higher banksi ho pf Q I 1 u 1 mg curve extending-upstream. i The loss of 1 Referring first to Fig 17 is'the m 6 head hereby occaslpnea at low d m is its top and f is the siphon extending i 15 Very (ionsldemble" t? f tl across the tope in s'uch manner that its upper I m tnvers fm img fiif :33:3 admissionedge gris situated below the upper I7:l-; tli l 1e wl iich i s 'a i ailable; fo1' utiliZa Wat?! l l uppellnexharustredge hielgw tion I p a i r the row water level. ii'XfiQtly at upper water These drawbacks are avoided according to f e 7 aSTtO dfab9rmme ed t e 1S dlsposed- V the present invention by automatically keepme top of d ing the head higher at normal and low water i i' y P h y If Q 45 than at high water; the head and drop at 9a Whlch drives P ma- Sue-4 hi h Water b i d t in d b th uppgr tionpipe k of which sucksair from the sum admission edge of the well known siphons 311i? Q the 91 bend F by sefts 9" extending across the dani,.which is arranged siphon operating. The air compressed by at a correspondingly lower leveht-he siphon theengine m can for instance be conducted 5% being set operating; whenever the-upstrean together with the exhaust water from the engine m to the low water level by means of the canal n formed in the dam (Z.

The siphons f can always be sufi'iciently etfioient to suck off more water than will how in at times of high water. By quickly and automatically exhausting the air from the siphon f by means of the tube f) and engine m, a quick starting of the siphon is provided for at the moment, when the upper water level predetermined for mean and low water is overstepped. lVhenever high Water is imminent, the siphons will act towards lowering the upper water level down to that level which is determined by tne admission edges g. Thus two different upper water levels are created according to whether the siphon is operating or not. during low and mean water, t 1e upper water level is kept by the admission edge 2' of the funnel at a predetermined level which in all cases is higher than the level now used. On the other hand, it during high water the siphon f is inoperation, the upper water level willgbe lowered down to the admission edge 9 of the siphon which is arranged below the edge 2' of the funnel. The difference of level between the edge 9 {LDC the highest water level at low water is such that the lowering of the upper water level brought about by 7 means of the siphon f suiiicies to carry the justable either before or during operation in order to be able to regulate the upper water level. This is illustrated in Fig. 2 together with very sensitive means for setting the siphon 7' operating. Here the upper funnel-shaped part 2' of the tube 6 leading to the engine m is movable and is adjusted by a float g or the like and lever 1 which is supported on the arm 3) 01" tube 2' If the upper water level exceeds a predetermined level, the admission funnel 2' is lowered quickly and thereby causes the exhausting engine m and the siphon. f'to be quickly started operating. Although afterwards the air pump is stopped by lowering the tloat (I and raising the funnel i the siphon f will nevertheless continue its operation until the high water wave has disappeared altogether and the upper water level has sunk below the admission edge g of the siphon. Only after this has taken place, the air entering the siphon 7 will stop its operation.

The newdam above described, while forming a very sensitive means of adjusting the upper water .evel, also affords a possibility of producing a higher head with quantities of water which are less than the quantities to be disposed of athigh water. I thereby obtain a gain ot'etli iency of the water power plant as a whole and also a greater depth of the river for the purposes of navigation. The top of the weir which can be disposed at any Inthe latter case, that is.

desired height above the highest normal water level, need not extend exactly in the horizontal.

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described obvious modifications will occur to a person skilled in the art.

I claim 1 1. A siphon spillway comprising a siphon and automatic starting means therefor, an adjustable admission member for the water to actuate said starting means being arranged at the highest admissible upstream level.

2. A siphon spillway comprising a siphon and automatic starting means theretor, an adjustable admission member for the water to actuate said starting means being arranged at the upstream level and a float for adjusting said member.

In testimony whereof I affix my signature.

FRANZ LAWACZECK.

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