CH395564A

CH395564A - Method for controlling the flow of liquid in a channel equipped with a weir and installation for implementing this method

Info

Publication number: CH395564A
Application number: CH1437363A
Authority: CH
Inventors: Bendel Henry
Original assignee: Pista Sa
Priority date: 1963-11-22
Filing date: 1963-11-22
Publication date: 1965-07-15

Description

Proced@ de commande du d6bit de liquide d'un canal uruni d'un d6versoir et installation pour la mise en aeuvre de ce procede Il est connu que 1e d6bit d'un d6versoir est fonc- tion de 1'6paisseur de la laure d6versante. Si 1e niveau du liquide en amont du d6versoir varie, la laure d6ver- sante varie Jans les memes proportions, donc 1e debit deversant est fonction de 1'6paisseur de rette laure. Method for controlling the flow of liquid from an uruni channel of a spillway and installation for implementing this method It is known that the flow rate of a spillway is a function of the thickness of the overflowing laure. If the level of the liquid upstream of the weir varies, the overflowing laure varies in the same proportions, therefore the overflowing flow is a function of the laurel thickness.

Si 1'on desire que 1e d6bit en aval du deversoir sofft maintenu sensiblement constant entre certaines limites, malgre des variations 6ventue1les de niveau du cöt6 amont, il est essentiel de pouvoir commander 1'epaisseur de la laure d6versante pour maintenir celle-ci si possible constante. C'est 1ä 1e but que s'est fixe la presente invention qui a pour objet un proced6 de commande du d6bit de liquide d'un canal uruni d'un deversoir, caracteris6 par 1e fait que 1'on fait agir sur la laure deversante un coussin d'air ä Pression va riable selon le d6bit desire. If it is desired that the flow rate downstream of the weir should be kept substantially constant between certain limits, despite possible variations in level on the upstream side, it is essential to be able to control the thickness of the overflowing laure to maintain it if possible. constant. This is the first object that the present invention has set itself, the object of which is a process for controlling the flow of liquid from an uruni channel of a weir, characterized by the fact that action is made on the overflowing laure an air cushion with variable pressure according to the desired flow rate.

L'invention a 6galement pour objet une installa- tion pour la mise en oeuvre du proced6 susindiqu6, comprenant un d6versoir forma dune paroi disposde transversalement au canal. Cette ins@tallation est ca- raet6risee par 1e fait que 1e bord sup6rieur de rette paroi, sur lequel passe la laure d6versante, est recou- vert, avec espace, dune enceinte en forme gdnerale de gouttiere renversee, dont les bords plongent dans la veine liquide iamont, respectivement aval, des moyens permettant de faire agir une Pression d'air reglable dans rette eneeinte pour regler 1'epaisseur de la laure ddversante, un canal d'dvacuation d'un sur- plus eventuel de liquide 6tant,disposd du edt6 aval de ladite enceinte. A subject of the invention is also an installation for carrying out the abovementioned process, comprising a weir formed of a wall arranged transversely to the channel. This installation is characterized by the fact that the upper edge of the wall, over which the overflowing lavra passes, is covered, with space, by an enclosure in the general form of an inverted gutter, the edges of which plunge into the vein liquid iamont, respectively downstream, means allowing an adjustable air pressure to act in the eneeinte rette to regulate the thickness of the overflowing laure, a channel for the evacuation of any excess liquid 6tant, disposed of the edt6 downstream of said enclosure.

Le dessin annex6 repr6sente, sch6matiquement et ä ti.tre d'exemple, une forme d'exeeution de 1'installa- tion selon 1'invention. The attached drawing represents, schematically and by way of example, one form of execution of the installation according to the invention.

La fig. 1 est une vue en 616vation, en coupe, de rette forme d'ex6cution, dont la fig. 2 est une vue en plan. fig. 1 is a 616vation view, in section, of this form of execution, of which FIG. 2 is a plan view.

Ce procede de commande :du d6bit de liquide d'un canal 1 uruni d'un d6versoir 2 consiste ä faire agir sur la laure ddversante 3 Passant par-dessus le bord superieur 4 de la paroi 5 constitu-ant 1e ddversoir, un coussin d'air 6 ä Pression variable selon 1e d6bit desird. This control method: of the flow of liquid from a channel 1 uruni of a weir 2 consists in acting on the overflowing laure 3 Passing over the upper edge 4 of the wall 5 constituting ant the first weir, an air cushion 6 at variable pressure according to the first flow rate desired.

L'installation de reglage permettant la mise en aeuvre d'un tel procdde comprend une enceinte 7 en forme gen6rale de gouttiere renversde, eneeinte dont les bords 8, respectivement 9, plongent dans la veine liquide amont 10, respectivement Jans la veine liquide aval 11. The adjustment installation allowing the implementation of such a process comprises an enclosure 7 in the general shape of a reversed gutter, enclosed whose edges 8, respectively 9, plunge into the upstream liquid vein 10, respectively Jans the downstream liquid vein 11 .

Un canal d'6vacuation 12 est contigu ä 1'eneeinte 7. Ce canal d'evacuation est destine ä 1'6vacuation d'un surplus eventuel de liquide en direction dune conduite 13. An evacuation channel 12 is contiguous to enclosure 7. This evacuation channel is intended for the evacuation of any excess liquid in the direction of a conduit 13.

Des moyens permettent de faire agir une Pression d'air regIable dans 1'enceinte 7. Ces moyens compren- nent une conduite 14 destinee ä 1'amen6e d'air com- prim6 ä partir dune source quelconque compos6e sofft d'un compresseur d'air, sofft d'un accumulateur d'air sous Pression uruni d'un detendeur r6glable. Un ma- nometre 15 permet 1e contröle de rette Pression d'air, respectivement 1e contröle de la hauteur H de la laure d6versante 3 qui est inversement proportionnelle ä la Pression d'air. Means allow an adjustable air pressure to act in the enclosure 7. These means comprise a pipe 14 intended for the supply of compressed air from any source whatsoever consisting of a air, sofft of a pressurized air accumulator fitted with an adjustable regulator. A manometer 15 allows the control of the air pressure, respectively the control of the height H of the overflowing laure 3 which is inversely proportional to the air pressure.

Dans 1e ras oü 1'on desire que 1e dNebit de la veine liquide 11 en aval du d6versoir 2 sofft constant, il est n6cess,aire de & tecter les variations de niveau de la veine liquide 10 en amont du d6versoir 2 pour corri- ger en fonction de ce niveau de la veine 10 la Pression agissant dans 1'enceinte 7. 0n peut saus autre utiliser Jans ce but un appareil d6tecteur de niveau de cons- truction connue agissant sur la source amenant Pair comprime destind ä former 1e coussin d'air 6. In the ras where it is desired that the dNebit of the liquid stream 11 downstream of the weir 2 should be constant, it is necessary to detect the variations in level of the liquid stream 10 upstream of the weir 2 in order to correct as a function of this level of the vein 10 the pressure acting in the enclosure 7. For this purpose, it is possible without any other use to use a level detector device of known construction acting on the source bringing the compressed air intended to form the cushion of air 6.

Il est ä noter qu'en variante an pourrait 6gale- ment placer un appareil detecteur @de niveau Jans la veine de liquide aval 11 et commander la Pression d'air comprim6 en fonetion des varfations du niveau de rette veine 11. 0n poumrait aussi commander la Pression Jair comprime formant 1e coussin 6 ä Faide d'un appareil d6tectcur de la diffirenee entre 1e niveau amont de la weine 10 et 1e niveau aval de la weine 11. It should be noted that, as a variant, one could also place a level detector device in the downstream liquid stream 11 and control the compressed air pressure according to variations in the level of this stream 11. One could also control the compressed air pressure forming the cushion 6 with the aid of a device detecting the difference between the upstream level of the wave 10 and the downstream level of the wave 11.

Le fonctionnement de 1'installation decrite ci- dessus est 1e suivant Etant donne que 1e d6bit de la weine liquide amont 10 peut varier dans de grandes propoitions tandis qu'on desire un d6bit constant dans l.a weine liquide aval 11, Ie liquide passe par 1e deversoir 2. La hau- teur H de la laure ddversante est dop-. d6terminante du d6bit de liquide. Taut que 1e d6bit de la weine amont 10 est inf6rieux ou egal au d6bit desird de la weine aval 11, il West pas necess,aire d'envoyer de Fair comprime dans 1'enceinte 7, 1e coussin Jair 6 6tant alors form6 d'un coussin saus Pression atmo- sph6rique. Le ddversoir 2 fonctionne alors normale- ment comme tout d6versoir de construction habituelle. Par contre, si le d6bit de la weine amont 10 aug- mente, il y a lieu de maintenir 1'6paisseur de la laure deversante ä une valeur ddterminee correspondant au d6bit desir6 de ia weine aval 11. Cette epai.sseur d6- terminee H de la laure deversante est alors maintenue gräce ä une 6ldvation de Pression du coussin d'air 6, elevation commandde automatiquement par un appa- reil detecteur de niveau de la weine amont 10, par exemple. Uexces de d & it amont passe aloTs par- dessus 1'eneeinte 7 et se & verse dans 1e .canal d'eva- cuation 12 debouchant Jans la conduite 13 d'evacua- tion. La Pression du coussin d'air 6 doit donc varier en fonction du niveau de la weine liquide amont 10. En effet, plus le niveau de rette weine amont 10 s'dleve, plus ia Pression d'air du coussin 6 doit etre 6galement elev6e. The operation of the installation described above is as follows Given that the flow rate of the upstream liquid weine 10 can vary within wide ranges while a constant flow rate is desired in the downstream liquid weine 11, the liquid passes through the weir 2. The height H of the overflowing laure is dop-. determinant of liquid flow. As long as the flow rate of the upstream weine 10 is less than or equal to the desired flow rate of the downstream weine 11, it is not necessary to send air compressed into the enclosure 7, the cushion Jair 6 then being formed of a cushion under atmospheric pressure. Weir 2 then functions normally like any weir of usual construction. On the other hand, if the flow rate of the upstream weine 10 increases, it is necessary to maintain the thickness of the overflowing laure at a determined value corresponding to the desired flow rate of the downstream weine 11. This determined thickness H of the overflowing laure is then maintained thanks to an increase in pressure of the air cushion 6, elevation automatically controlled by an upstream water level detecting device 10, for example. The excess d & it upstream then passes over the enclosure 7 and pours into the evacuation channel 12 opening out in the evacuation pipe 13 . The pressure of the air cushion 6 must therefore vary according to the level of the upstream liquid weine 10. Indeed, the higher the level of the upstream liquid weine 10, the higher the air pressure of the cushion 6 must also be. .

En reglant la Pression du coussin ou matelas Jair 6 dans 1'enceinte 7, an peut ä volont6 r6gler 1e debit du liquide s'ecoulant ä 1'aval du ddversoir 2. En outre, si la Pression donn6e au coussin Jair 6 est superieu@re ä Gelle de la colonne d'eau compri.se entre la Grete 4 du d6versoir 2 et 1e niveau maximurn de la weine amont 10, 1'dcoulement du liquide par 1e ddver- soir est interrompu et tont 1e ddbit de la weine amont 10 passe alors par-dessus 1'enceinte 7 pour se deverser Jans le canal d'6vacu,ation 12, respectivement Jans la conduite 13. L'installation agit alors Jans ce ras comme un organe darret de 1'dcoulement et constitue en quelque sorte une vanne pneumatique. By adjusting the pressure of the air cushion or mattress 6 in the enclosure 7, one can at will adjust the flow rate of the liquid flowing downstream of the weir 2. Furthermore, if the pressure given to the air cushion 6 is greater than At the end of the water column comprised between the height 4 of the spillway 2 and the maximum level of the upstream weine 10, the flow of the liquid through the spillway is interrupted and all the flow of the upstream weine 10 then passes over the enclosure 7 to flow into the evacuation channel 12, respectively into the pipe 13. pneumatic valve.

L'installation dderite ci-dessus peut eire construite en Wimporte quel matdriau usuel. Toutefois, de pr6f6- rence, l'enceinte 7 est construite en täle soudde, 6tant donnd quelle doit etre & anche ä Fair. Quant aux di- mensions de rette enceinte 7, elles seront choisies en fonction des variations de debit ddsirees pour la weine liquide aval 11. En effet, RTI ID="0002.0273" WI="12" HE="4" LX="689" LY="2368"> 1'espace s6p-arant la Grete 4 du d6versoir 2 du fond supdrieur de 1'enceinte 7 d6 termine le ddbit maximum pouvant passer de la weine amont 10 ä la weine aval 11 par 1e d6ver soir 2. The installation described above can be constructed from any usual material. However, preferably, the enclosure 7 is constructed of welded sheet metal, since it must be weather sealed. As for the dimensions of enclosure rette 7, they will be chosen according to the variations in flow desired for the downstream liquid weine 11. Indeed, RTI ID="0002.0273" WI="12" HE="4" LX="689 " LY="2368"> the space separating Grete 4 of spillway 2 from the upper bottom of enclosure 7 d6 terminates the maximum flow that can pass from the upstream weine 10 to the downstream weine 11 via the first spillway 2.

Une telle installation de rdglage du & bit de liquide d'un canal peut trouver son application dans toutes les installations hydrauliques oü 1e d6bit dune weine liquide doit eire contrölable et reglable. Une applica- tion particulierement avantageuse est Gelle destinee aux stations d'dpuration d'eaux usees, res stations d'epuration ne pouvant traiter qu'un debit maximum d'eaux usees bien determine. Such an installation for adjusting the bit of liquid of a channel can find its application in all hydraulic installations where the flow of a liquid weine must be controllable and adjustable. A particularly advantageous application is Gelle intended for waste water purification stations, res purification stations being able to treat only a well-determined maximum flow of waste water.

Etant donne que 1e ddbit Jans la weine aval 11 est fonction de lepaisseur de la laure deversante 3 et que rette epaisseur est fonction elle-meme de la Pres sion du coussin ou matelas d'air 6, il est possible de contröler (pour autant que le d6bit de la weine amont 10 soit consdere comme constant Pendant une Periode donnee) 1e d6bit du liquide sur 1e deversoir 2 par sim ple lecture du manometre 15 raccord6 sur 1e tube d'alimentation d'air 14. Le manometre 15 pourrait dans ce ras presenter une graduation en ml/seconde, par exem@ple. Given that the flow rate in the downstream weine 11 is a function of the thickness of the overflowing lavra 3 and that this thickness is itself a function of the pressure of the cushion or air mattress 6, it is possible to control (provided that the flow of the upstream weine 10 is considered as constant during a given period) the flow of the liquid on the weir 2 by simple reading of the pressure gauge 15 connected to the air supply tube 14. The pressure gauge 15 could in this ras present a graduation in ml/second, for exem@ple.

Claims

CLAIMS 1. Proc @ di control of the flow of liquid from a channel (1) uruni a spillway (2), characterized by the first fact that 1e is acting on the pouring laure (3) an air cushion (6) Variable pressure according to the desired flow rate. 1I. Installation for carrying out the process according to claim I, comprising a devcrsoir (2) in the form of a wall (5) arranged transversely to the channel (1), characterized in that the first upper edge (4) of the second wall (5 ), over which the overflowing laure (3) passes, it is covered with space by an enclosure (7) in the general shape of an inverted gutter with the edges (8, 9) plunging into the upstream liquid weine (10), respectively anal ( 11), means (14) allowing an adjustable air pressure to act in this enclosure (7) to adjust the thickness of the laure & slope (3), an evacuation channel (12) of one on - Any more liquid 6tant has the downstream side of said enclosure (7). SUB-CLAIMS 1. Installation according to claim 11, characterized in that it comprises a detector apparatus from the upstream level (10) to the weir (2) intended to control the air pressure in the enclosure. (7) as a function of this upstream level (10).

2. Installation according to claim 11, characterized in that it comprises an apparatus for detecting the level downstream (11) relative to the weir (2) intended to control the air pressure in the enclosure (7) in operation. of this downstream level (11).

3. Installation according to claim II, characterized in that it comprises RTI ID="0002.0538" WI="4" HE="4" LX="1583" LY="2212"> a difference detecting device between the upstream (10) and downstream (11) levels, intended to control the air pressure in the enclosure (7) as a function of this difference.

4. Installation according to claim 11, characterized in that it comprises a pressure gauge (15) indicating the air pressure in the enclosure (7), this pressure gauge (15) having a scale allowing flow control Passing through the weir (2).