WO2001011149A1 - Systeme de retenue etage - Google Patents

Systeme de retenue etage Download PDF

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Publication number
WO2001011149A1
WO2001011149A1 PCT/EP2000/007770 EP0007770W WO0111149A1 WO 2001011149 A1 WO2001011149 A1 WO 2001011149A1 EP 0007770 W EP0007770 W EP 0007770W WO 0111149 A1 WO0111149 A1 WO 0111149A1
Authority
WO
WIPO (PCT)
Prior art keywords
rake
bars
grate
partial areas
flow
Prior art date
Application number
PCT/EP2000/007770
Other languages
German (de)
English (en)
Inventor
Markus Bablok
Michael Eilers
Martin Meurer
Original Assignee
Gerd Meurer Umwelttechnologie Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gerd Meurer Umwelttechnologie Gmbh filed Critical Gerd Meurer Umwelttechnologie Gmbh
Priority to AU69945/00A priority Critical patent/AU6994500A/en
Publication of WO2001011149A1 publication Critical patent/WO2001011149A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
    • E02B8/02—Sediment base gates; Sand sluices; Structures for retaining arresting waterborne material
    • E02B8/023—Arresting devices for waterborne materials
    • E02B8/026—Cleaning devices

Definitions

  • the present invention relates to a step rake with a stepped double grate, which is arranged transversely to the direction of flow in a rake inlet, and which has spaced apart, alternately fixed and movable rake bars, the movable rake bars between the fixed rake bars being motorized on a closed movement path are driven all round, whose plane of movement lies in the longitudinal direction of the rake bars and transversely to the grate plane.
  • Such a device which is used for collecting and discharging solids which are carried in flowing water in channels or the like, is known in the prior art, for example from EP 0 484 724 B1.
  • the rake screen arranged transversely in the cross section of the rake inlet is formed by a double grate of a plurality of rake bars arranged side by side and running from top to bottom, which are inclined in the direction of flow and whose front edge lying in the direction of flow is stepped. Because of the stepped shape, these devices are also generally called step rakes.
  • the double grate of such a stage calculator consists of fixed rake bars fixed in the inlet, as well as movable rake bars arranged alternately between them.
  • the movable rake rods are set in a circular orbital movement relative to the fixed rake bars, in such a way that the movable rake bars as a whole are displaced parallel between the fixed rake bars Rotate rakes in a movement plane lying in the direction of flow. Due to the stepped front edge of the rake bars, which are designed as plate-shaped sheet-metal lamellas, the screenings washed onto the double grate are transported upwards in the direction of circulation from the rake inlet and can be removed and deposited there.
  • step rakes are characterized by a good filter effect and high operational reliability. Due to their uncomplicated mechanical structure, they are considered to be extremely robust and reliable, with the technical effort and, correspondingly, the maintenance and costs being less than in comparable powerful computing systems of other designs, for example circular screen rakes with a spiral conveyor or the like.
  • a problem in operation can arise, however, from the fact that screen breaking systems generally have to be dimensioned according to the highest hydraulic load to be expected, that is to say the maximum inflow quantity. This refers both to the flow cross-section of the double grate, and to the formation of the inlet, that is, the channel. This leads to the fact that the computing systems are operated predominantly in part-load operation, the supply quantity being considerably smaller than in theoretical full-load operation due to the large load fluctuations. Because of the over-dimensioning in normal or part-load operation, there are often problems with deposits, since the flow velocity is relatively low due to the large flow cross-section and heavy solids such as sand and the like settle in the inlet area of the screen and lead to malfunctions can.
  • the present invention has the task, in view of the prior art explained at the outset, of providing a rake which has the described advantages of a step rake, but which largely prevents the formation of deposits.
  • the invention proposes that the double grate has at least two adjacent areas of its inflow grate surface, and flow guide means are arranged in the rake inlet in front of the double grate, through which the aforementioned partial areas can be flowed depending on the feed quantity.
  • the step rake designed according to the invention still has a simple double grate, the flowable grate surface of which is dimensioned for the throughflow of the maximum expected feed quantity.
  • the peculiarity of the invention now lies in installing flow guide means in the rake inlet, with which selective subregions of this grate surface can be applied. This selective loading provides that only a narrow area of the double grate is flowed through with a small inflow quantity under partial or normal load and, as soon as the inflow level rises, at least one further subarea lying in the grate area next to the first-mentioned subarea is acted upon with inflow water.
  • a particular advantage of the invention is that a step rake in a known and well-proven design, which results, for example, from EP 0 484 724 B1 mentioned at the beginning, obtains a particularly advantageous additional functionality with relatively little technical effort. Because of the flow guide means according to the invention, small inlet quantities are concentrated in normal operation in a narrow inlet cross section and directed to a partial cross section of the grate surface. Fluidically this has the advantage that because of the small flow cross section A sufficient flow rate is guaranteed at all times, even with small inflow quantities, in order to reliably avoid sand deposits and the like.
  • step rakes mentioned at the beginning are retained in full.
  • the flow guide means can have a simple overflow threshold, which is designed, for example, as an overflow plate. In this way, a narrow channel can be separated in the rake inlet based on the entire rake width.
  • the level of this overflow threshold is dimensioned such that the inlet water overflows it when a predetermined inlet level is exceeded and then acts on adjacent sub-areas of the computing area.
  • the invention thus for the first time shows a possibility of optimizing the technically proven and sophisticated construction of step rakes with little technical effort in such a way that optimal hydraulic conditions are present both with a small inflow under normal load and with a maximum inflow under full load, which form the formation of deposits and the problems that they trigger as far as possible.
  • the complex additional computing device proposes, only a single double grate is required in the invention, as previously.
  • an advantageous embodiment of the invention provides that the flow guide means have overflow thresholds which extend from the fixed rake bars against the flow direction into the rake inlet. These overflow thresholds separate narrow partial channels from the rake inflow, which are acted on when the inflow level exceeds the respective overflow threshold. It is both conceivable that in the simplest case only a single overflow threshold is provided, which releases the entire computing cross section when the inflow level is exceeded under normal load. However, it is also conceivable to provide several overflow thresholds of different heights which release the flow cross-section in succession.
  • overflow thresholds are designed as overflow plates attached to the fixed rake bars.
  • This is essentially an extension of the rake bars designed as sheet metal plates or lamellas in the opposite direction to the flow into the rake inlet.
  • This also opens up the possibility of the Uberia plates being detachably attached to the fixed rake bars, for example screwed, plugged in or otherwise interchangeable.
  • a step calculation in production can be adapted to the hydraulic conditions to be expected in each case.
  • the overflow plates can be solid, preferably integrally formed with the rake bars.
  • This embodiment is particularly efficient insofar as the sheet metal cross sections correspondingly shaped only for selected fixed rake bars have to be used. This means that the additional technical effort involved in the implementation is practically negligible compared to a conventional, known structure.
  • the overflow plates it is also possible for the overflow plates to be solid, preferably integrally formed with the rake bars. This embodiment is particularly efficient insofar as the sheet metal cross sections correspondingly shaped only for selected fixed rake bars have to be used. This means that the additional technical effort involved in the implementation is practically negligible compared to a conventional, known structure.
  • the flow guide means can be arranged in the supply structure.
  • the above-mentioned overflow plates can equally be fastened or formed in the channel of the building, so that the partial loading of the grate surface according to the invention is also achieved.
  • the rake inlet has a channel with adjacent, different depth channel areas, which correspond to the partial areas of the double grate, the partial areas of the double grate each reaching to the bottom of the channel.
  • This design practically adapts the double grate to a rake inlet in that a narrow area of the channel is recessed as a low water inlet.
  • the rake bars of the double grate are pulled down in the partial area that can be subjected to partial load down to the narrow low-water channel.
  • a flow guide means according to the invention is realized, which, with the length of the rake rods adapted to it, ensures that the function according to the invention is realized. In the partial load range, only that part of the grate surface that reaches down to the channel bottom is applied.
  • the inlet cross section can also be designed in several stages. As the inlet level increases, a step-widened inlet cross-section of the double grate is released in this way. In addition to a gradual, gradual widening of the rake inlet by the flow guide means, there is also a continuously widening upward The same can apply to the gap between the rake bars. In terms of production technology, this embodiment has the advantage that only one sheet thickness is used to manufacture the rake bars, which of course enables particularly efficient production.
  • both the bar width of the rake bars and the gap width between the rake bars can be specified differently in the different partial areas.
  • any variable permeability of the double grate can be realized in the individual partial areas according to the invention. In this way, flow conditions and velocities adapted to the respective conditions and expected operating conditions can be specified.
  • the configuration of the double grate by varying the bar width and width of the gap can essentially be combined with all of the proposed and still conceivable configurations of the flow guide means.
  • An optimization to all expected hydraulic conditions and feed quantities is conceivable without leaving the basic idea of the present invention.
  • the technical effort is relatively low in any case. Nevertheless, the basic advantages of a step calculation remain undiminished.
  • FIG. 1 a perspective partial view of a step rake according to the invention in a first embodiment
  • Fig. 2 a view as in Fig. 1 of a step calculation according to the invention in a second embodiment.
  • WO 01 IX XX 49 PCT / EP00 / 07770
  • FIG. 1 and 2 show obliquely in the flow direction, which is indicated by a solid, straight arrow, a perspective view of the lower region of a step rake 1 according to the invention.
  • the step rake 1 shown has a double grate 2, which, inclined in the direction of flow, is arranged in a rake inlet (not shown), in such a way that the grate surface fills the cross section of the channel.
  • This double grate 2 is formed from a multiplicity of alternately successive fixed rake bars 3a and movable rake bars 3b, which are arranged next to one another at a distance of the gap width.
  • the movable rake bars 3b run in operation on a closed movement path between the fixed rake bars 3a, which is indicated in the drawing by the dashed circle.
  • flow guide means according to the invention in the form of overflow plates 4 are attached to a total of two fixed rake bars 3a, which extend into the rake inlet counter to the flow direction and connect there to corresponding wall regions 5 of the channel.
  • a central partial area 2a is separated from two lateral partial areas 2b by the Uberia plates 4 from the grate surface of the double grate 2 which can be flowed against.
  • the function of the overflow plates 4 according to the invention now consists in the fact that when the amount of inflow between the walls 5 of the channel to the central portion 2a is so large that the height of the overflow plates 4 is exceeded, the waste water - as indicated by the dashed arrows - is above the overflow plates 4 flow and thus also flows to the lateral computing areas 2b.
  • the mode of operation of the embodiment shown in FIG. 2 is identical to that shown in FIG. 1.
  • the rake bars 3a and 3b are arranged closer together in the middle section 2a between the overflow plates 4, i. H. the width of the double grate 2 is smaller there.
  • This has the advantage that a particularly good computing effect is guaranteed in normal operation, that is to say with smaller amounts of waste water.
  • full-load operation if the side sections 2b are acted upon by the relatively larger gap width, sufficient flow capacity is ensured.
  • the overflow plates 4 can be releasably attached to the fixed rake bars 3a in such a way that they can be moved or replaced laterally by the operating personnel with little effort, for example to change the width of the partial areas 2a and 2b depending on the season and thus a particular one to achieve a good adaptation of the calculation characteristics to the actual amounts of waste water.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

La présente invention concerne un système de retenue étagé (1) pourvu d'une double grille étagée (2) qui est disposée perpendiculairement à la direction d'écoulement, dans une entrée du système de retenue, et qui présente des barres de retenue (3a, 3b), disposées à distance les unes à côtés des autres, chacune d'entre elles pouvant être fixe ou mobile. Les barres de retenue mobiles (3b) peuvent être actionnées par un moteur de façon à tourner entre les barres de retenue fixes (3a), sur une trajectoire fermée, leur plan de mouvement se trouvant dans la direction longitudinale des barres de retenue et perpendiculaire au plan de grille. L'objectif de cette invention est d'éviter, dans la plus large mesure, la formation de dépôts, par exemple de dépôts de sable. Afin d'atteindre cet objectif, la double grille (2) présente au moins deux zones partielles voisines (2a, 2b) de sa surface de grille sur laquelle le flux s'écoule et des moyens de conduction de l'écoulement (4) sont disposés dans l'entrée du système de retenue, avant la double grille (2), le flux pouvant s'écouler, à travers ces moyens de conduction, sur lesdites zones partielles (2a, 2b), en fonction de la quantité d'alimentation.
PCT/EP2000/007770 1999-08-10 2000-08-10 Systeme de retenue etage WO2001011149A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU69945/00A AU6994500A (en) 1999-08-10 2000-08-10 Stepped rake

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19937321A DE19937321A1 (de) 1999-08-10 1999-08-10 Stufenrechen
DE19937321.3 1999-08-10

Publications (1)

Publication Number Publication Date
WO2001011149A1 true WO2001011149A1 (fr) 2001-02-15

Family

ID=7917563

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/007770 WO2001011149A1 (fr) 1999-08-10 2000-08-10 Systeme de retenue etage

Country Status (3)

Country Link
AU (1) AU6994500A (fr)
DE (1) DE19937321A1 (fr)
WO (1) WO2001011149A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2137473A1 (de) * 1971-07-27 1973-02-08 Hornbach Ohg A W Rechenbauwerk
EP0484724A2 (fr) 1990-11-06 1992-05-13 GERD MEURER GmbH Dispositif pour recueillir et délivrer des matières solides de l'eau courante
EP0640370A2 (fr) 1993-08-24 1995-03-01 Rudolf Bischof GmbH Dispositif pour décharger des composants solides d'un fluide
US5795467A (en) * 1996-10-23 1998-08-18 Schloss Engineered Equipment, Inc. Adjustable inlet for waste water treatment apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2025722A (en) * 1933-07-20 1935-12-31 Thomas R Camp Flow control apparatus
US3469403A (en) * 1966-03-16 1969-09-30 Yawata Seitetsu Kk Buttress type steel dam for collecting debris
SE448106B (sv) * 1985-05-24 1987-01-19 Wallander Hydropress Co Ab Anordning for uppsamling och uppfodring av i strommande vatten burna, fasta partiklar

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2137473A1 (de) * 1971-07-27 1973-02-08 Hornbach Ohg A W Rechenbauwerk
EP0484724A2 (fr) 1990-11-06 1992-05-13 GERD MEURER GmbH Dispositif pour recueillir et délivrer des matières solides de l'eau courante
EP0640370A2 (fr) 1993-08-24 1995-03-01 Rudolf Bischof GmbH Dispositif pour décharger des composants solides d'un fluide
US5795467A (en) * 1996-10-23 1998-08-18 Schloss Engineered Equipment, Inc. Adjustable inlet for waste water treatment apparatus

Also Published As

Publication number Publication date
AU6994500A (en) 2001-03-05
DE19937321A1 (de) 2001-03-15

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