EP3061875B1 - Device and method for activating or purifying wells - Google Patents

Description

The invention relates to a device for activating or cleaning wells according to the preamble of claim 1, and a corresponding method using such a device.

In the production of filter strands in the ground for the promotion of groundwater, it is necessary after completion of the well structure from the annulus between the filter tube and the edge of the built-in filter grain bed consisting of filter gravel, filter sand or glass balls, during construction rinses and so-called. Sub-grain rinse. Such a discharge of contaminants or particles is called activation. The aim of activating a well is to create as large a pore space as possible in the filter annulus and adjacent soil, so that the flow resistance for the groundwater entering the well is as small as possible and the resulting groundwater pressure drop is minimized at and in the well. Upon activation, silt, fine sand and other small mineral or organic particles that can be transported through the pores of the supporting grain scaffolds with the flowing groundwater at a correspondingly high velocity should also be introduced into the well from the adjacent layers of soil and thus pumped out.

Furthermore, a bowl-shaped support grain filter is to be generated in the transition region of the built-in annular space filter grain bed adjacent thereto natural soil by rinsing the small grains from the soil in this annular zone, which is composed of the coarser support grains of the soil, which is not built through the pore channels Filter grain bed fit. It is also desirable, behind the supporting grain filter to be produced very small grains in the adjacent soil, the so-called. Suffosionenfähigen grain sizes that can be transported at sufficiently large transport forces through the pore channels of the natural soil, also from a to rinse out the greatest possible radial environment around the borehole. By means of these measures the so-called well filter development or activation, a good permeability and a large pore volume in the grain filter are to be achieved in order to produce the lowest possible water level reductions in groundwater extraction by means of low inflow resistances, whereby the least possible energy expenditure for groundwater elevation is to be ensured.

The filter grain bed produced at the fountain establishment is to be repeatedly cleaned or regenerated even after times of well operation to precipitations of mineral and / or organic origin resulting from the inflowing groundwater and sediment grains from the soil that have accumulated in the filter grain bed and have accumulated in the grain filter pores to remove again. In order to achieve the required cleaning of the pores in all described locations of the filter grain bed, which surrounds the filter tube, sufficiently large shear forces of the flowing groundwater must be generated in these locations in order to be able to transport the particles to be rinsed. In addition, the particle flow which takes place with the groundwater flow through the pore channels must be stimulated by suitable measures, because the particles in the chaotically shaped flow paths constantly jam through the pores of the skeleton of the filter grains in the pore deflection angles and thus the particle transport is hindered or without special measures, which makes the trapped particles transportable again, comes to a standstill. Both goals are pursued through different measures and active principles of action.

The regeneration of wells includes all measures that are used to remove mineral and / or organic deposits from the well annulus and the adjacent mountains during a well operating period. The methods used for this purpose follow the principle of separation or detachment of deposits and buildup of the filter material and the supporting grain skeleton of the adjacent mountains and the discharge of these particles through the well filter. For the separation and detachment are different procedures and devices using hydromechanical, hydropneumatic and chemical principles of action known.

For discharging deposited and / or dissolved particles from the annulus of a well and the mountains adjacent thereto, it is necessary to generate as high flow velocities in the area to be cleaned. Known methods and devices used therefor reduce the well filter to be treated to a working section by introducing into the filter tube a working chamber provided with seals at its ends. In the prior art, such a working chamber is described in German Utility Model 81 20 151, wherein between two spaced apart and superposed shut-off bodies and an inner wall of the filter tube, a so-called working chamber is formed. Through this working chamber whose height or length to the total length of the filter tube is comparatively short, an approximately 5- to 10-fold higher flow rate is pumped than is the case with normal well operation over this section of the well filter. Because of the so-called permeability contrast, according to which the water permeability in the gravel bed in the filter annulus is greater than that of the adjacent mountains, the increased flow has only a slight effect on the flow velocity in the annulus and in the adjacent mountains. In addition, it is always the annular space over the entire filter tube length is flowed radially from the upcoming mountains. The groundwater enters the filter tube above and below the working chamber and flows in the annular space and in particular within the filter tube in the direction of the working chamber, wherein the groundwater flowing in the filter tube flows around the shut-off to enter the working chamber laterally. As a result, the flow portion of the well water in the annulus area laterally or radially adjacent to the working chamber is reduced and reduces its flow velocity, which adversely affects the cleaning performance.

DVGW leaflet W 119 describes well-known extraction chambers for intensive desanding. With regard to these removal chambers, a sufficient radial flow of the chamber opening is assumed. To the geometric Limiting the chamber opening in the filter tube sealing bodies are required at the ends, which are designed either as sealing discs or as volume variable (inflatable) annular tubes. Here, a longitudinal extent of this seal body or its length in relation to the length of the open chamber is given no importance. Instead, with respect to these seal body only their sealing effect within the filter tube to limit the work or removal chambers classified as important. Conventional devices for cleaning wells, such as after DE 81 20 151U , are subject to the disadvantage that even at a considerably increased delivery rate, the cleaning performance in the annulus and in particular in the adjacent mountains is not optimal. Other known devices, for example DE 40 17 013 C2 or DE 38 44 499 C1 are used for cleaning a gravel backfill and the adjacent mountains in the radial environment of a well, whereby by using pumps and separate chambers, a circulation flow between a plurality of chambers is generated. This pursues the purpose of effecting a flushing of the pore space in the filter gravel and in the adjacent mountains outside between the chambers delimited in the well filter tube, in order thereby to dissolve contaminants and deposits adhering to the gravel grains. If necessary, this can be accompanied by the addition of chemical cleaning agents.

Simultaneously with the flow rate, a pore space stimulation can be realized by means of which the particles which are constantly jammed in the pore deflection angles can be released and made transportable. Such pore space stimulation can be produced in various ways according to the prior art. Known is the alternating reversal of the flow direction by short interruptions of the flow, z. B. by switching off the feed pump, whereby the water located in a riser above the extraction chamber flows back through the chamber into the pore space and pushes back the previously sucked particles. Since a switching process is characterized by a few minutes of pumping and an even shorter switch-off time, this is Frequency of the switching operations about 0.1 to 0.3 Hz and requires correspondingly long treatment times until a pore filter is sufficiently cleaned.

Another possibility of pore space stimulation consists in the continuous change of the flow direction from the filter grain bed in the sampling chamber by a corresponding device with its removal chamber along the filter tube over a portion of the filter tube is constantly reciprocated. As a result, the inflow direction changes with respect to the chamber, which activates activation of possible particle transport paths in the chaotic grain filter. This type of pore space stimulation does not require any additional technique to generate and introduce pulses and may be used with extraction chambers with discs or pistons as limitations.

In all sampling chambers of known devices, irrespective of the type of sealing bodies they are limited to, a problem arises from the fact that the chamber delivery rate does not always automatically result in two equally large portions Q _O and Q _U and a smaller radially inflowing portion Q _r is split. The division of the chamber delivery rate excluding the radially inflowing portion Q _r in two equal proportions Q _O = Q _U occurs approximately only independently when the extraction chamber is located exactly in the middle of a well filter and also the filter is in the middle of a hydraulic contiguous aquifer layer with approximately uniform permeability. Such a situation is in Fig. 1 shown. However, it should be noted that this situation occurs infrequently or not at all. Basically, it can be assumed that natural aquifers are always stratified due to their geological history and consequently characterized in layers by different permeabilities. The length of well filters is chosen regularly depending on how technically required to remove the desired amount of water. Conveniently, these filter lengths are then arranged in the region of the best-permeable layers of the well. Consequently, only a part of a groundwater from hydraulically coherently traversed aquifer is developed as a well filter, with a remaining part of the aquifer remains undeveloped. During the removal of groundwater through such a well filter, also referred to as "imperfectly expanded", it is flowed through its longitudinal extent at different intensities. If there is a removal chamber in the middle of this filter, which separates the water flow entering in the upper section of the well filter from the water flow flowing in the lower section, these partial flows being combined only after the chamber boundaries have flowed around, it goes without saying that due to the Asymmetry of the flow spaces and also the different permeabilities in the mountains these sub-streams Q _O and Q _{U are} always different from each other. This situation is in Fig. 2 shown. This difference between the partial flows Q _O and Q _U can assume extreme values such that in each case one of the two partial flows assumes a situation-specific maximum value and the other partial flow approaches zero.

Out DE 10 2009 018 383 B4 a device for activating or cleaning filter tube wells is known in which a removal chamber is formed between a first and a second volume body, from which water can be discharged from the filter tube well by means of a pumping device. In this device, a compensating pipe is provided, which completely penetrates the removal chamber in the longitudinal direction of the device, said compensating pipe causes a hydraulic connection between the areas adjacent to each of the removal chamber opposite outer end faces of the two volume bodies. The hydraulic connection through the compensating pipe causes an automatic pressure or volume flow compensation between the regions of the filter tube above and below the device in the event of an uneven flow to the device. The device according to DE 10 2009 018 383 B4 has the disadvantage that a possible flow rate through the compensating pipe is limited and the provision of several such compensating pipes is structurally complex and expensive.

Out EP 2 952 640 A1 a device for activating or cleaning filter tube wells with a filter tube is known. This device comprises a first and a second volume body, which are adapted with its outer diameter substantially to the inner diameter of the filter tube and on its outer peripheral surface each have sealing means by which a sealing effect between the solids and the inner wall of the filter tube is adjustable, a removal chamber, between the first and second Volume body and the inner wall of the filter tube is formed, wherein the removal chamber can be hydraulically connected to a pumping device. There is a hydraulic connection between the regions which adjoin the outer end sides of the two solids opposite the extraction chamber, namely by an annular space which completely penetrates at least the extraction chamber in the direction of the longitudinal axis of the device and between an outer pipe and an inner pipe Inner tube is formed.

WO 2005/007980 A1 discloses a well for recovering, observing and / or lowering groundwater having a standpipe having at least one filter tube portion and having at least one pump disposed in the standpipe. For this well, it is provided that a spraying device for spraying the filter tube region and / or a well region, which is adjacent to the filter tube region, is assigned to the filter tube region. The spraying device is connected to at least one pressure line through which the spraying device is supplied with a medium to be atomized.

Out DE 34 45 316 A1 a generic device according to the preamble of claim 1 is known.

Accordingly, the invention has for its object to provide a device and a method for activating or cleaning wells and a corresponding method, with or with the improved activation or cleaning performance due to a greater radial depth effect within the aquifer of the well is feasible.

This object is achieved by a device having the features of claim 1 and by a method having the features of claim 15. Advantageous developments of the invention are defined in the dependent claims.

A device according to the invention is used for activating or cleaning filter tube wells with a filter tube, and comprises a first volume body and a second volume body, these volume bodies are adapted with their respective outer diameter substantially to the inner diameter of the filter tube and each have on its outer peripheral surface sealing means by means of which a sealing effect with respect to the inner wall of the filter tube can be achieved. Furthermore, the device comprises at least one removal chamber, which is formed between the first and the second volume body and the inner wall of the filter tube. The removal chamber may be hydraulically connected to a pumping device, wherein during operation of the pumping device water can be pumped out of the removal chamber. Between the first and the second volume body, two removal chambers in the form of an upper removal chamber and a lower removal chamber are formed in the longitudinal direction of the device. These two extraction chambers are hydraulically separated from each other and can be connected by separate hydraulic connections in each case to the pumping device. Along the longitudinal axis of the device, an outer tube is provided, wherein the solid bodies are attached to an outer peripheral surface of the outer tube. Within the outer tube coaxially an intermediate tube is arranged, wherein between the outer tube and the intermediate tube, an outer annular space is formed. The operation of this outer annulus is explained below in detail.

The present invention is based on the essential finding that a greater radial penetration depth in the soil, which is adjacent to the filter tube of the well, is possible by cooperation of the upper sampling chamber and the lower sampling chamber with respect to discharging or pumping out water from the filter tube is. In other words, the cylindrical zone of action of the radial depth effect in the drilling brine to the adjacent Aquifer in enlarged. In practical terms, the two zones of action of the upper removal chamber and the lower removal chamber in this radially remote zone of pore cleaning combine to form a coherent effective area with sufficiently large flow forces which can extend over the entire axial length of the device. It is advantageous that the upper removal chamber and the lower removal chamber are each connected by separate hydraulic connections to the pumping device. The dimensions of these hydraulic connections are designed such that a volume flow which is discharged through a respective extraction chamber, ie through the upper extraction chamber and the lower extraction chamber, assumes substantially the same value. In other words, in each case a half volume of water is pumped through a respective extraction chamber, with respect to the discharged from the filter tube total amount of water.

The device according to the invention is intended, in particular, to be used as a "moving chamber", wherein it is continuously moved during operation of the pumping device within the filter tube of a filter tube well. For this case, a pore space stimulation within a filter grain bed of the well and the adjacent mountains can be improved by providing a third central volume body, which is arranged between the upper sampling chamber and the lower sampling chamber. The third volume body is in the same way as the first and second volume body with its outer diameter substantially adapted to the inner diameter of the filter tube and has on its outer peripheral surface sealing means with which a sealing effect with respect to the inner wall of the filter tube is realized. During a movement of the device along the filter tube, the flow direction at a certain point of the well changes by up to 180 °. This has the consequence that in a shorter time a large number of particles are transported through the pore channels of the filter grain bed or the adjoining mountains.

In an advantageous embodiment of the invention, a third central volume body may be provided, which is arranged between the upper and lower removal chamber. The third volume body is adapted with its outer diameter substantially to the inner diameter of the filter tube, and has on its outer peripheral surface sealing means with which a sealing effect with respect to the inner wall of the filter tube can be adjusted. With regard to a hydraulically effective multiple change of the flow direction during a movement of the device according to the invention along the filter tube, it is advantageous if the third central volume body in the axial direction of the device is formed as long as the first and second volume body.

In an advantageous embodiment of the invention, the respective volume bodies may be formed segment-like in the longitudinal direction of the device, e.g. in the form of disc-shaped segments. These segments of the respective solids can be pushed onto the outer tube of the device and fixed thereto in a predetermined position. In this case, then determines a number of segments an axial extent of a respective volume body along the longitudinal axis of the device.

In order to ensure an effective treatment of even unfavorably constructed wells, which are characterized by comparatively small well pipe diameter and by very large bore diameter, it is recommended to strengthen the radial depth effect or the generation of sufficiently large flow forces in the direction of the filter tube in a large radial distance. This is possible with the device according to the invention in that an axial length of the third central volume body is reduced, which is possible in the above-mentioned segment-like design simply by taking out a segment of the third volume body. By such a reduction of the axial length of the third central volume body are the Effects of the upper and lower sampling chamber superimposed or reinforced, whereby sufficiently large flow forces are generated in the outer filter ring zone to the drilling brine.

In an advantageous embodiment of the invention, it is possible that the upper extraction chamber is hydraulically connected to either the outer annulus or with the interior of the intermediate tube, and that the lower extraction chamber is hydraulically connected either to the interior of the intermediate tube or with the outer annulus, so that the outer annular space and the intermediate tube for the removal chambers each form separate hydraulic connections to the pumping device. In other words, on the one hand, the outer annular space, which is formed between the outer tube and the intermediate tube, and on the other hand, the interior of the intermediate tube, each be designed as a hydraulic connection, through which a respective extraction chamber is hydraulically connected to the pumping device. In this case, recesses are formed in the wall of the outer tube adjacent to the removal chamber, which extend parallel to the longitudinal axis of the outer tube. In the wall of the intermediate tube adjacent to the upper removal chamber or the lower removal chamber also recesses are formed which extend parallel to the longitudinal axis of the outer tube and in particular opposite to the recesses of the outer tube. Here, connecting channels lead from the recesses of the outer tube radially through the outer annular space to the respective opposite recesses of the intermediate tube, so that this removal chamber is hydraulically connected to the interior of the intermediate tube and hydraulically separated from the outer annulus.

To ensure an equal volume flow of water, which is discharged through the respective extraction chambers, it is expedient for the just mentioned embodiment, when the dimensions of the outer annulus and the diameter of the intermediate tube are matched to one another such that during operation of the pumping means a matching throughput for the upper and lower extraction chamber. It is also advantageous if the intermediate tube and the outer tube at an upper end of the outer tube can be hydraulically connected via a common connection coupling with the pumping device.

In an advantageous embodiment of the invention, it is also possible that the outer annular space serves as a hydraulic connection between the outer end faces of the outer tube and is part of such a hydraulic connection. For this purpose, the outer tube is open at its outer end faces. Thus, upon movement of the device along the filter tube, water may pass through the annulus formed within the outer tube, resulting in reduced flow resistance for the device as it moves within the filter tube. In the same way, this hydraulic connection between the outer end faces of the outer tube, even if the device is not moved within the filter tube, ensures a pressure or volume flow compensation between the regions of the filter tube above and below the device.

In the last-mentioned embodiment of the invention, it is also advantageous if an inner tube is arranged coaxially within the outer tube, which also runs inside the intermediate tube. Accordingly, an inner annulus is formed between the inner tube and the intermediate tube, the upper sampling chamber being hydraulically connected to either the inner annulus or the interior of the intermediate tube, and the lower sampling chamber being hydraulically connected to either the interior of the intermediate tube or the inner annulus is. Accordingly, the inner annular space and the inner tube for the two extraction chambers each form separate hydraulic connections to the pumping device.

In an advantageous embodiment of the invention according to the latter embodiment, recesses may be formed in the wall of the outer tube adjacent to the removal chambers, which extend parallel to the longitudinal axis of the outer tube. In the wall of the intermediate tube adjacent to the upper sampling chamber also recesses may be formed, which are parallel to the longitudinal axis of the outer tube and opposite to the recesses of the outer tube. Here, connecting channels lead from the recesses of the outer tube radially through the outer annulus to the respective opposite recesses of the intermediate tube, so that the upper sampling chamber is hydraulically connected to the inner annulus and hydraulically separated from the outer annulus.

In an advantageous embodiment of the invention, the inner tube may extend within the outer tube in the axial length of the device at least to the region of the lower sampling chamber, wherein in the wall of the inner tube adjacent to the lower sampling chamber recesses are formed, which are parallel to the longitudinal axis of the outer tube and opposite extend to the recesses of the outer tube. Here then lead connecting channels of the recesses of the outer tube radially through the annulus formed between the inner tube and the outer tube through to the respective opposite recesses of the inner tube, so that the lower sampling chamber hydraulically connected to the interior of the inner tube and the annulus between the inner tube and the Outer tube is hydraulically separated.

The last-mentioned embodiment of the invention is characterized in that three tubes are inserted into one another coaxially, namely an outer tube, an intermediate tube and an inner tube. As a result, an outer annular space and an inner annular space are formed as explained within the outer tube. The outer annular space, which is formed between the outer tube and the intermediate tube, then serves in conjunction with an annular space between the outer tube and the inner tube as a hydraulic connection between the outer end faces of the outer tube. Furthermore, the inner annulus as well as the interior of the inner tube each perform the function of a separate hydraulic connection to connect the upper and lower sampling chamber with the pumping device. In this way, a technically simple and at the same time robust tool can be realized with comparatively few components for use on the construction site in order to activate or clean wells.

In an advantageous embodiment of the invention, the intermediate tube can pass through the outer tube from an upper end of the device forth to about a central region thereof. Furthermore, the inner tube can pass through the outer tube substantially along its entire length. Here, the intermediate tube in the axial direction of the device is formed only as long as it makes the inner annulus formed between the intermediate tube and the inner tube, in its function as a hydraulic connection for the upper sampling chamber with the pumping device required. Furthermore, this makes it possible that the inner tube is also disposed adjacent to the lower sampling chamber, so that through the recesses formed in the walls of the outer tube and the inner tube, in conjunction with the interposed connecting channels, the inner tube as a hydraulic connection for the lower sampling chamber can serve with the pumping device.

With regard to the embodiment of the invention, in which, as explained, the three tubes, namely the outer tube, intermediate tube and inner tube, are coaxially inserted into one another, it is advantageous that the dimensions of the inner annular space and the diameter of the inner tube are matched to one another such that during operation of the Pumping device sets a matching throughput for the upper and lower sampling chamber. Furthermore, it is advantageous if the intermediate tube and the inner tube at an upper end or an upper end side of the outer tube can be hydraulically connected via a common connection coupling with the pumping device.

In an advantageous embodiment of the invention, the respective volume body can be attached to an outer peripheral surface of the outer tube, wherein the first, second and / or third volume body relative to the outer tube in the direction of a longitudinal axis of the device are displaceable and fixable in a predetermined position on the outer tube. Prior to commissioning of the device, a displacement of the volume body relative to the outer tube in the direction of a longitudinal axis of the device is possible. After reaching a predetermined position, the solids can be fixed to the outer tube by suitable clamping devices or the like.

In an advantageous embodiment of the invention, the first, second and / or third volume body in the longitudinal direction of the device is formed like a segment, wherein the segments are pushed onto the outer tube and fixed thereto in a predetermined position, preferably, that an axial extent of a solid by the number its segments is variable.

In an advantageous embodiment of the invention, the upper and lower removal chamber may be formed approximately in a central region of the device, wherein the adjoining first and second volume body extending in the direction of the outer end sides of the outer tube and thus are attached end to the outer tube.

In an advantageous embodiment of the invention, an axial length of the recesses formed in the walls of the individual tubes, and an axial length of the adjacent thereto connecting channels may be greater than an effective axial height of an extraction chamber adjacent thereto. Preferably, these recesses and the associated connection channels are made in the axial direction of the device so long that they adjoin each other in the symmetrical center of the device, and from there to the respective end-side end faces of the device. If the bulbs are mounted on the outer tube of the device, it is possible that a part of the recesses formed in the outer tube will be covered by the bulbs. As a result, only the part of the recesses formed in the outer tube, and in the same way the associated recesses in the intermediate tube or in the inner tube, which are located between the solids and are not covered accordingly, accessible for a radial inflow of water , By a desired positioning of the volume body on the outer peripheral surface of the outer tube, the height of the upper and lower sampling chamber depending on a particular Einsatzwecks can be accurately adjusted or retrofitted. A predetermined positioning of the solids on the outer peripheral surface of the outer tube is possible by suitable spacers, preferably in the form of so-called annular baskets. In this Way is possible with mechanically simplest means a conversion of the device according to the invention in all conceivable types of intensive extraction chambers.

In an advantageous development of the invention, the sealing means may have open-cell foam or bristles on the outer circumferential surfaces of the solid bodies, for the purpose of a sufficient sealing effect with the inner wall of the filter tube. The open-cell foam or the bristles are designed in such a way that to ensure the desired sealing effect on the one hand fill the space between the bars of a Wickeldrahtfilters into the filter slots and on the other hand tight against the inner tube wall on the inside smooth filter tubes. Furthermore, the nature of the foam or bristles is selected to provide adequate resistance to wear and excessive wear when the device is moved along the filter tube. According to a preferred embodiment, the sealing means or the solid bodies can be designed such that they are formed from the open-cell foam or from the bristles or consist thereof.

In an advantageous development of the invention, the sealing means and / or the solid bodies can have a variable volume. This means that the sealing means or the solids can be increased in volume by supplying a fluid, for example compressed air or water, and thereby being widened radially outwards. This is useful in a stationary operation of the device within the Filterrohrbrunnens, ie at a fixed and predetermined position within the filter tube, useful because the desired sealing effect between the solids and the filter tube is optimized by the radial expansion of the sealant or the solid. Conversely, this means that by discharging fluid from the variable volume of the sealant or the solid body whose expansion decreases in the radial direction, whereby a subsequent method of the device in the longitudinal direction of the well is easily possible.

A still further optimized sealing effect can be achieved in that the sealing means or the solid bodies have a variable volume, wherein on the associated outer circumferential surface of a flexible layer of foam, or bristles as explained above, are attached. This leads to a superposition of the above-mentioned advantages with respect to the one hand, the flexible layer of foam or bristles, and on the other hand, a targeted expansion or reduction of the sealant or the solid in the radial direction. An additional advantage to this combination is that an outer peripheral surface of the variable volume by attaching the flexible layer of foam, or by the provision of the bristles, is less susceptible to damage when in contact when supplying a fluid in the variable volume comes with the filter tube.

In an advantageous embodiment of the invention, the outer tube or the inner tube may be provided in the region of a lower end side of the device with connecting means to attach other equipment for well treatment on the device. Such equipment can be, for example, a pulse generator, are introduced by the hydromechanical pulses in the well. A high-pressure hose for feeding the pulse generator can be guided, for example, through the annular space between the outer tube and the intermediate tube or the inner tube.

The invention also relates to a method for activating or cleaning filter tube wells with a filter tube, wherein a device according to the aforementioned embodiments and possibilities along the filter tube is continuously moved upwards or downwards and thereby promoted by the pumping means water from the two sampling chamber of the device and from the fountain is discharged.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

The invention is illustrated schematically below with reference to preferred embodiments in the drawing, and will be described in detail with reference to the drawing.

Fig. 1

Strömungsverhältnisse für eine herkömmliche Reinigungsvorrichtung bei idealisierten Bedingungen eines Filterrohrbrunnens,

Fig. 2

die Reinigungsvorrichtung von Fig. 1 bei tatsächlichen Bedingungen eines Filterrohrbrunnens, wenn ungleichmäßige Strömungsverhältnisse vorliegen,

Fig. 3

eine seitliche Schnittansicht entlang der Längsachse einer erfindungsgemäßen Vorrichtung, wenn diese in einem Filterrohrbrunnen eingesetzt ist, wobei Strömungsanteile in dem Filterrohrbrunnen idealisiert dargestellt sind,

Fig. 4

eine Perspektivansicht eines Teils eines Außenrohrs der Vorrichtung von Fig. 3, mit daran angebrachten Abstandshaltern in Form von Ringkörben,

Fig. 5

verschiedene Ansichten eines Abstandshalters von Fig. 4,

Fig. 6

verschiedene Ansichten einer erfindungsgemäßen Vorrichtung, nämlich in fertig montiertem Zustand, nämlich eine seitliche Schnittansicht entlang deren Längsachse, und mehrere Querschnittsansichten davon,

Fig. 7

verschiedene Ansichten eines Außenrohrs gemäß Fig. 2, nämlich eine Seitenansicht davon und mehrere Querschnittsansichten,

Fig. 8

eine Seitenansicht und eine Querschnittsansicht eines Zwischenrohrs, das für eine Vorrichtung gemäß Fig. 3 bzw. Fig. 6 Verwendung findet,

Fig. 9

eine Seitenansicht und eine Querschnittsansicht eines Innenrohrs, das für eine Vorrichtung gemäß Fig. 3 bzw. Fig. 6 Verwendung findet,

Fig. 10, 11

verschiedene Ansichten von Rechteckrohren, die für eine Vorrichtung gemäß Fig. 3 bzw. Fig. 6 Verwendung finden,

Fig. 12

eine Draufsicht auf eine Ringscheibe, die bei der Vorrichtung gemäß Fig. 3 bzw. Fig. 6 Verwendung findet,

Fig. 13

eine seitliche Schnittansicht entlang der Längsachse einer erfindungsgemäßen Vorrichtung nach einer modifizierten Ausführungsform, und

Fig. 14

eine vereinfachte Darstellung von praxisrelevanten Strömungsanteilen in dem Erdreich angrenzend an einen Filterrohrbrunnen, wenn eine darin eingebrachte erfindungsgemäße Vorrichtung in Betrieb genommen ist.

Show it:

Fig. 1

Flow conditions for a conventional cleaning device in idealized conditions of a filter tube well,

Fig. 2

the cleaning device of Fig. 1 in actual conditions of a filter tube well, when uneven flow conditions exist,

Fig. 3

3 a side sectional view along the longitudinal axis of a device according to the invention, when it is inserted in a filter tube well, wherein flow components in the filter tube well are shown in idealized form,

Fig. 4

a perspective view of a part of an outer tube of the device of Fig. 3 , with attached spacers in the form of ring baskets,

Fig. 5

different views of a spacer from Fig. 4 .

Fig. 6

various views of a device according to the invention, namely in the fully assembled state, namely a lateral sectional view along the longitudinal axis, and a plurality of cross-sectional views thereof,

Fig. 7

different views of an outer tube according to Fig. 2 namely, a side view thereof and a plurality of cross-sectional views,

Fig. 8

a side view and a cross-sectional view of an intermediate tube, which is suitable for a device according to Fig. 3 respectively. Fig. 6 Use finds

Fig. 9

a side view and a cross-sectional view of an inner tube, which is suitable for a device according to Fig. 3 respectively. Fig. 6 Use finds

10, 11

different views of rectangular tubes, which are suitable for a device according to Fig. 3 respectively. Fig. 6 Find use

Fig. 12

a plan view of an annular disc, which in the apparatus according to Fig. 3 respectively. Fig. 6 Use finds

Fig. 13

a side sectional view along the longitudinal axis of a device according to the invention according to a modified embodiment, and

Fig. 14

a simplified representation of practice-relevant flow components in the soil adjacent to a filter tube well, when a device according to the invention introduced therein is put into operation.

Fig. 3 shows a simplified representation of a device 1 according to the invention in a longitudinal section, when the device is placed in a filter tube well with a filter tube 10. The filter tube 10 is formed in a known manner and allows water to flow radially from the outside through the filter tube 10, such as, as in Fig. 3 indicated by the arrow R.

The device 1 comprises a first (upper) volume body 12 and a second (lower) volume body 13 which are adapted with their respective outer diameter substantially to the inner diameter of the filter tube 10. On the outer peripheral surfaces of the volume body 12, 13 each sealing means 16 are provided, by means of which a sealing effect with respect to the inner wall of the filter tube 10 can be achieved.

Between the first and second volume bodies 12, 13, two removal chambers are formed in the longitudinal direction of the device, namely an upper removal chamber 18.1 and a lower removal chamber 18.2. These two removal chambers 18.1, 18.2 are hydraulically separated from each other and each connected by separate hydraulic connections to a pumping device 20. In detail, the upper removal chamber 18.1 is connected by a hydraulic connection 22 to the pumping device 20, wherein the lower removal chamber 18.2 is connected by a hydraulic connection 24 to the pumping device 20. Details of these hydraulic connections between the respective sampling chambers 18.1, 18.2. and the pumping device 20 are explained below.

The device 1 has an outer tube 26 which extends along a longitudinal axis L of the device 1. The first and second volutes 12, 13 are attached to an outer peripheral surface of the outer tube 26 and fixed there at a predetermined position. For this purpose, on the outer circumferential surface of the outer tube 26, a plurality of spacers 28 (FIG. fig. 4 ), which are respectively arranged on both sides of a volume body and thereby set the volume body at a predetermined axial position with respect to the outer tube 26.

In the wall of the outer tube 26 recesses are formed along the longitudinal axis L of the device 1, namely in the form of longitudinal slots. These recesses A ₂₆ in the wall of the outer tube 26 are provided in particular in the region of the upper and lower removal chamber 18.1, 18.2 and allow a radial inflow of well water into the device 1. Details of this radial inflow are explained below.

The device 1 may have a third central volume body 14 which is mounted on an outer peripheral surface of the outer tube 26 in the same manner as the volume bodies 12, 13. Here, the third central volume body 14 is located on the outer tube 26 between the upper volume body 12 and the lower volume body 13. By an axial distance between the first upper volume body 12 and the third central volume body 14, an effective height h of the upper sampling chamber 18.1 is determined. The same applies to the lower removal chamber 18.2, the effective height h in the axial direction by a distance of the third volume body 14 is determined by the second volume body 13. In any case, the removal chambers 18.1, 18.2 formed with their respective heights h in the axial direction of the device 1 so large that a certain throughput of well water during operation of the pumping device 20 can be sucked or discharged from the filter tube 10.

An embodiment of the spacers 28 for positioning the solids on the outer tube 26 is in the Fig. 4 illustrating the outer tube in a simplified perspective view. Here, the solids are omitted for simplicity. At a lower end side, the spacers may be formed in the form of a mounting clamp 29 or the like. In a central region of the outer tube 26, namely in particular adjacent to the recesses A ₂₆ in the region of the upper and enterprise removal chamber, the spacers in the form of so-called annular baskets 30 are formed. For an axial fixation of the volume body on the outer peripheral surface of the outer tube 26 at a predetermined position is provided that a respective volume body is bordered on both sides by a ring cage 30 and a mounting clamp 29. In terms of in Fig. 3 embodiment shown may be noted that the central volume body 14 is located between two annular baskets 30 and is thereby fixed in the axial direction of the outer tube 26. The first volume body 12 and the second volume body 13 are each located between a ring cage 30 and a fastening clamp 29u arranged on a lower end face 27u of the outer tube 26, and are thereby axially fixed to the outer tube 26.

Fig. 5 illustrates an embodiment of the ring baskets 30. In Fig. 5.1 a ring cage 30 is shown in a side view, wherein Fig. 5.2 a ring cage 30 along a section AA of Fig. 5.1 shows. Fig. 5.3 shows the ring cage 30 of Fig. 5.1 in a perspective view. The ring cage 30 consists of two ring elements 32 which are spaced from each other by a plurality of webs 34. An inner diameter of the ring elements 32 is adapted to an outer diameter of the outer tube 26, such that the annular baskets 30 can be pushed onto an outer peripheral surface of the outer tube 26 without jamming. By suitable clamping devices, it is possible to define a ring cage 30, and thus also a solid, at a predetermined axial position of the outer tube 26.

A synopsis of Fig. 3 , of the Fig. 4 and the Fig. 5.3 illustrates that a spacing of the two ring elements 32 of a ring cage 30 has a height h a respective extraction chamber defined, at least in the embodiment according to Fig. 3 , For this reason, the representation of Fig. 4 also provided that a ring cage 30 is attached to the outer tube 26 respectively adjacent to the recesses A ₂₆ . As a result, well water can flow in radially between the ring elements 32 from the outside into the outer tube 26.

For attaching the volume body 12, 13, 14 and the annular baskets 30 to the outer tube 26 may be noted that these components can be easily pushed onto the outer peripheral surface of the outer tube 26. Spacers 35 may be provided between the axial end faces of the solids and the annular baskets 30 adjacent thereto. For the embodiment of Fig. 3 is understood that then the upper volume body 12, a ring cage 30, the central volume body 14, another ring cage 30, and finally the lower volume body 13 are pushed onto the outer tube 26, namely in this order in the longitudinal axis of the device 1 seen from above below. Spacers 35 are arranged between the annular baskets 30 and the solids. In this arrangement, said components are "block", ie their respective end faces are in contact with each other. These components are then together at their respective position on the outer tube 26 by the mounting clamp 29u ( Figure 4 ) and a mounted on the upper end face 27o of the outer tube 26 mounting clamp 29o ( Fig. 3 Fixed or fixed, wherein the mounting clamps 29o, 29u are respectively arranged on the outer end faces of the adjoining solid. Such a mounting option has the advantage that for the individual components themselves, ie the solid body 12, 13, 14 and the ring baskets 30, no separate clamping devices are necessary, and for a set of all components on the outer tube 26 a total of only two fasteners, namely in the form of the clamps 29o, 29u, suffice.

The mounting clips 29 o, 29 u can be clamped at any desired positions on the outer peripheral surface of the outer tube 26, whereby the Bulk body 12, 13, 14 and the annular baskets 30 in different predetermined axial areas of the outer tube 26 can be fixed.

In the Fig. 6 to 11 Further details for the "inner life" of the device 1 and the associated components are explained, by which the said separate hydraulic connections 22, 24 between a respective removal chamber 18.1, 18.2 and the pumping device 20 are realized.

Fig. 6 shows various views of the device 1 and associated pipe elements. Fig. 6.1 shows the already mentioned outer tube 26 in a side view, wherein the volume body are omitted for simplicity. The outer tube 26 is also in the Fig. 7 shown again, namely in a side view ( Fig. 7.1 ), in a cross-sectional view along the line AA of Fig. 7.1 (Fig. 7.2 ), and in a cross-sectional view of the line BB of Fig. 7.1 (Fig. 7.3 ). The cross-sectional view according to Fig. 7.2 illustrates that the recesses A ₂₆ along the circumference of the outer tube 26 are formed in four segments, which are each spaced by about 90 ° from each other. Furthermore, the side view of Fig. 7.1 in that the recesses A ₂₆ extend over a large part of the axial length of the outer tube 26.

Fig. 6.2 shows a longitudinal sectional view along the line AA of Fig. 6.1 , It can be seen that within the outer tube 26, an intermediate tube 36 is received, which extends approximately to the middle of the outer tube 26. The intermediate tube 36 is also in the Fig. 8 shown, namely in a side view ( Fig. 8.1 ), and in a cross-sectional view along the line AA of FIG Fig. 8.1 (Fig. 8.2 ). The cross-sectional view according to Fig. 8.2 illustrates that in a wall of the intermediate tube (36) also recesses A _{36 are} formed, namely along the circumference of the intermediate tube 36 in four areas, which are spaced about 90 ° to each other.

Between the outer tube 26 and the intermediate tube 36 is mounted device 1, an outer annular space 38 (see. Fig. 6.5 ) educated. The intermediate tube 36 is positioned within the outer tube 26 such that its recesses A ₃₆ are respectively disposed opposite to the recesses A ₂₆ , which are formed in the wall of the outer tube 26. The oppositely disposed recesses A ₂₆ and A ₃₆ are interconnected by connecting channels 40, namely in the form of so-called rectangular tubes, which are received within the outer annular space 38.

The rectangular tubes 42K for connecting the recesses A ₂₆ with the recesses A ₃₆ are in the Fig. 10 represented there, namely in a plan view ( Fig. 10.1 ), in an end view ( Fig. 10.2 ), in a side view ( Fig. 10.3 .) and in a perspective view ( Fig. 10.4 ). With respect to these connecting channels 40 in the form of rectangular tubes 42K, through which, as explained, the recesses A _{26 are} connected to the recesses A ₃₆ , it should be pointed out that these are hydraulically separated from the outer annular space 38. It should also be noted that a height h _{1 of} the rectangular tubes 42K (see. Fig. 10.3 ), as the radial height of the outer annular space 38, ie, as the distance between the inner peripheral surface of the outer tube 26 and the outer peripheral surface of the intermediate tube 36. This ensures a seamless connection between the recesses A ₂₆ and A ₃₆ . Incidentally, it is understood that an axial length of the rectangular tubes 42K is chosen substantially coincidentally as an axial length I of the recesses A ₂₆ (see. Fig. 7.1 ).

The longitudinal section view of Fig. 6.2 further clarifies that within the outer tube 26 also coaxially an inner tube 44 is arranged, wherein the inner tube 44 extends within the already mentioned intermediate tube 36. An axial length of the inner tube 44 is selected such that it passes through the outer tube 26 substantially in its entire axial length. In the longitudinal section of the outer tube 26, in which the inner tube 44 extends within the intermediate tube 36, an inner annular space 46 (cf. FIG. 2) between the inner tube 44 and the intermediate tube 36 is provided. Fig. 6.4 ) educated. In the longitudinal section of the outer tube 26, which is not penetrated by the intermediate tube 36, between the inner tube 44 and the outer tube 26, a further annular space 48 (see. Fig. 6.3 ) educated. With respect to the inner annulus 46, it should be noted that the intermediate tube 36 at its free end 36u ( Fig. 6.2 ) is closed to the outer peripheral surface of the inner tube 44. This is important for the hydraulic connection 22 between the upper extraction chamber 18.1 and the pumping device 20, as explained in detail below.

The inner tube 44 is also in the Fig. 9 shown, namely there in a side view ( Fig. 9.1 ), and in a cross-sectional view along the line AA of FIG Fig. 9.1 (Fig. 9.2 ). The last-mentioned cross-sectional view illustrates that in a wall of the inner tube 44 also recesses A _{44 are} formed, namely along the circumference of the inner tube 44 in four areas, which are spaced from each other by 90 °. In the same way as the intermediate tube 36, the inner tube 44 is disposed within the outer tube 26 such that the recesses A ₄₄ in the wall of the inner tube 44 are each opposite to the recesses A ₂₆ in the wall of the outer tube. These opposing recesses A ₂₆ , A ₄₄ are interconnected by connecting channels 40, namely by rectangular tubes 42 L, which in addition in the Fig. 11 are shown. Specifically, there are a rectangular tube 42L in a plan view ( Fig. 11.1 ), in an end view ( Fig. 11.2 ), in a side view ( Fig. 11.3 ) and in a perspective view ( Fig. 11.4 ). In this case corresponds to a height h _{2 of} the rectangular tubes 42L (see. Fig. 11.3 ) exactly one radial height of the annular space 48 between the inner tube 44 and outer tube 26. In this way, with a rectangular arrangement of the rectangular 42L inside the annular space 48, a tight hydraulic connection between the recesses A ₂₆ and A _{44 is} possible in order to provide a hydraulic separation of to achieve the annulus 48.

The above-described "nesting" of the intermediate tube 36 and the inner tube 44 respectively within the outer tube 26, after which these three tubes are inserted into each other and coaxially arranged, is also in the cross-sectional views of the Fig. 6.3 - Fig. 6.6 shown. In detail, these illustrations show a section along the line BB of FIG Fig. 6.2 (Fig. 6.3 ), a section along the line CC of Fig. 6.2 (Fig. 6.4 ), a section along the line DD of Fig. 6.2 (Fig. 6.5 ), and finally a cut along the line EE of Fig. 6.2 (Fig. 6.6 ). These cross-sectional views also illustrate, in particular, the position of the respective recesses in the tubular elements relative to one another, and also the positioning of the rectangular tubes 42K, 42L within the respective annular spaces to ensure a hydraulic connection between the respectively opposite recesses of the tubular elements.

It should be noted at this point that all of the illustrations shown for the respective pipe elements and the other components are not to scale, but are to be understood only in a simplified sense for an interaction of these components.

The outer tube 26 is formed open on its upper end side 27o and on its lower end side 27u. This has the consequence that a hydraulic connection between these end faces 27o, 27u of the outer tube 26 which passes through the outer annular space 38 and the annular space 48 and in the Fig. 3 symbolized by dashed lines HV. This hydraulic connection HV allows a compensation flow between the outer end faces of the outer tube 26, when the device 1 should be flown unevenly on its upper side and on its underside in the radial direction. In this regard, it should be noted that this hydraulic connection HV, which as explained by the outer annular space 38 and the annular space 48 extends, is not affected by the rectangular tubes 42K and 42L. This is due to the fact that these rectangular tubes 42K and 42L are arranged with their longitudinal axis parallel to the longitudinal axis L of the device 1, so that the hydraulic connection HV in each case runs parallel or adjacent to these rectangular tubes 42K, 42L, and as described above is hydraulically separated is.

The representations in the Fig. 3 and Fig. 6.2 illustrate that both the intermediate tube 36 and the inner tube 44 are led out of the outer tube 26 at the upper end side 27 o, wherein the intermediate tube 36 and the inner tube 44 are then connected via a common connection coupling 50 and a connecting line 52 together to the pumping device 20. The connecting line 52 is preferably flexible and designed a Length compensation to allow movement of the device 1 within the filter tube 10 along its longitudinal axis L, possibly also over long distances, without restriction.

At an upper end face 27 o, the wall of the outer tube 26 perforations are formed along the circumference, namely in the form of holes 54. These holes are in the illustration of Fig. 7 to recognize, and in particular in the cross-sectional view of Fig. 7.3 , For axial fixation of an upper edge of the first upper volume body 12 serves at the upper end face 27o of the outer tube 26, a spacer in the form of an annular disc 56 which serves as a separate component in the Fig. 12 is shown in a plan view. On an inner peripheral edge of this annular disc 56 recesses 58 are formed, which adjoin the holes 54 on the upper end face 27o of the outer tube 26.

The above-described holes 54 at the upper end face 27o of the outer tube 26 serve in conjunction with the annular disc 56 and its recesses 58 for the purpose that particles, especially sand, sediments or similar granular contaminants, can pass therethrough to subsequently through the outer annulus 38 of the device 1 to fall down. The above the device 1 in the well water entering and sinking particles are promoted in this way with the flowing from the outside through the holes 54 water through the device 1 and the outer annular space 38 down into the well sump. Due to the open configuration of the outer tube 26 on its lower end side 27u, these particles can then emerge completely downwards out of the device 1. In this way, particles are prevented from accumulating on an upper side of the device 1.

The solid bodies 12, 13, 14 are in the form of segments S, ie in the form of disk-shaped elements which can be stacked in a plurality and then jointly form a respective solid. In the presentation of Fig. 3 the first volume body 12 is formed for example by two segments S _12/1 and S _12/2 , which are mounted together on the outer peripheral surface of the outer tube 26 and in the longitudinal axis L of Adjacent device 1. A separate attachment of the two segments S _12/1 and S _12/2 at their interface is not required because the first volume body 12 is bound as such from above through the annular disc 56 and from below through a ring cage 30 and thus held together.

In the same way as the first upper volume body 12 may be for the embodiment of FIG. 3 Also, the second lower volume body 13 may be formed of two segments, namely by a segment S _13/1 and S _13/2 .

In the same way as the volume bodies 12, 13, the third central volume body 14 can also be designed in the form of individual segments. In the embodiment of Fig. 3 the third solid 14 consists of three segments, namely the segments S _14/1 , S _14/2 and S _14/3 . Also for these segments of the third volume body 14 is that they are mounted adjacent to each other on the outer peripheral surface of the outer tube 26, with a separate connection at the interfaces of these segments is not required because the central volume body 14 bounded at its ends by ring baskets 30 and in this manner is fixed to the outer tube 26.

The number of segments shown in the drawing for the respective solids is only to be understood as an example. This means that the individual solids can also have more segments than shown in the drawing. For example, the first volume body 12 and / or the second volume body 13 may also have three or more segments.

In the device 1 according to the invention, it is possible to change a position of the respective volume body 12, 13, 14 on the outer peripheral surface of the outer tube 26 and thereby adjust, for example, a height h of the upper sampling chamber 18.1 and / or the lower sampling chamber 18.2, depending on the purpose of the Device 1 and the type of well to be treated. Such a change in position of the solids on the outer tube 26 in the axial direction of the device 1 can be easily achieved in such a way that the volume body parallel to the longitudinal axis of the device 1 on the outer tube 26th are displaceable. This applies equally to the spacers, in the form of the mounting bracket 29, the annular baskets 30 and the annular disc 56. These spacers can also be moved along the outer tube 26 in its axial direction, wherein after reaching a predetermined position for the solid these spacers be clamped to the outer tube 26, thereby to hold the solid at its predetermined position with respect to the outer tube 26.

A change in a height of the upper or lower removal chamber 18.1, 18.2 can be carried out as described by moving the volume body in the axial direction with respect to the outer tube 26. In this connection, it is also possible to change an axial length of the respective solid by removing or adding segments thereof. This is possible in a simple manner by the explained segmental structure of the solid. A variable positioning, in particular of the upper and lower volume body 12, 13 on the outer peripheral surface of the outer tube 26 is particularly possible because the recesses A ₂₆ , A ₃₆ and A ₄₄ along the longitudinal axis of the device 1 are sufficiently long. This makes it possible that the upper and lower sampling chamber can be variably formed at the locations of the outer tube 26, which are not enclosed or covered by the solids. In this way, the device 1 can be retrofitted in a structurally simple way in all conceivable types of intensive care chambers.

The embodiment of the device 1 according to the Fig. 3 can be modified so that the third central volume body 14 is not mounted on the outer tube 26 and is omitted accordingly. Such a modification is in the illustration of Fig. 13 shown similar to a longitudinal section through the device 1 to Fig. 3 illustrated when the device is inserted into the filter tube 10 of a well. In the embodiment of the device 1 according to FIG. 13 Overlay the upper sampling chamber 18.1 and the lower sampling chamber 18.2 total to a common large sampling chamber 18, between the end faces of the two solids 12, 13 in the central region the device 1 is formed. A fixing of the two solid bodies 12, 13 and the annular baskets 30 provided therebetween on the outer tube 26 in its axial direction takes place in the same way as in Fig. 3 in that these components are pushed onto the outer tube 26 "adjacent to one another" adjacent to one another and are suitably clamped or held by the fastening clamps 290, 29u. Incidentally, the structure of the embodiment of Fig. 13 that of the embodiment of Fig. 3 , wherein the same components are provided here with the same reference numerals and may be referred to the above explanations to avoid repetition.

The operation of the invention and a corresponding use of the device 1 within the filter tube 10 of a well are explained below as follows:

The device 1 is completely introduced into a filter tube well or in its filter tube 10. This is simplified as explained in the Fig. 3 and the Fig. 13 illustrated for various embodiments of the device 1. The filter tube 10 is surrounded by an annular space region 62 which is filled with a gravel filling. Specifically, the annulus area 62 immediately adjacent to the filter tube 10 includes an inner trailing edge 62 _i , wherein radially adjacent to an outer trailing edge 62 _{a is} provided. In that regard, the annulus area 62 includes a double debris, which differs from each other in their permeability. The annulus area 62 is with its two Hinterschüttungen also in the representation of Fig. 14 shown in simplified form. The annulus area 62 is surrounded by adjacent mountains 64.

The device 1 is flowed out of the mountains 64 radially from a volume of water. As a result of the outer open end faces of the outer tube 26 automatically adjusts itself through the outer annular space 38, a hydraulic compensation flow between the end faces of the device 1, if the device 1 should be flowed at their end faces by different sized volumes of water. In other words, causes the hydraulic connection HV through the outer annular space 38, an automatic suction flow control, which has the consequence that approximately equal amounts of water can enter into the upper extraction chamber 18.1 and 18.2.

During operation of the pumping device 20, water is drawn in through the connecting line 52. As explained above, both the inner annular space 46 and the inner tube 44 are connected in common via the connecting coupling 50 with the connecting line 52 and thereby connected to the pumping device 20. As a result, during operation of the pumping device 20, on the one hand, water is pumped out or discharged from the upper removal chamber 18.1, namely by the hydraulic connection 22, which is formed by the rectangular tubes 42K and the inner annular space 46. It is important that the intermediate tube 36 at its lower end face 36u as described with respect to the outer peripheral surface of the inner tube 44, and thus the inner annular space 46, are formed closed, so that pumping out of water from the inner annular space 46 during operation of the pumping device 20 is possible.

In the same way, during operation of the pumping device 20, water is also pumped out or discharged from the lower removal chamber 18. 2, namely by the hydraulic connection 24 formed by the rectangular tubes 42 L and the inner of the inner tube 44. These hydraulic connections 22, 24 are hydraulically separated from each other, it being ensured by means of a corresponding dimensioning of the pipe elements involved that water from the upper sampling chamber 18.1 and the lower sampling chamber 18.2 is always pumped out at the same throughput. Thus, the entire volume of water Q, which is pumped out of the well by means of the device 1, is divided equally between Q / 2 and the two extraction chambers 18.1, 18.2.

The hydraulic connection HV, which is ensured by the outer annular space 38 of the device 1 between its end face, causes as explained an automatic self-control with respect to a compensation flow between the end faces of the device. Furthermore, this simplifies an axial movement or displacement of the device 1 within the filter tube 10, because the flow resistance is reduced thanks to the hydraulic connection HV through the outer annular space 38. In this connection, it should again be pointed out that a compensating flow within the device 1 through its outer annular space 38 and a pumping of water through the hydraulic connections 22, 24 can take place simultaneously and without mutual interference, because these flow channels are hydraulically separated from each other.

In the representations of the Fig. 3 and 13 are indicated by the reference numerals I and II different areas in which the water flows from the mountains 64 through the annulus area 62 in the direction of the removal chambers 18.1, 18.2. In the regions I, the water flows approximately parallel to the longitudinal axis L of the device 1 in the direction of a respective extraction chamber. In areas II, there is a gentle change in direction of the water flow, in order finally to enter radially into a respective extraction chamber 18.1, 18.2. At the level of the line U there is a reversal of the water flow in the opposite direction. The representation of Fig. 14 clearly illustrates the lines of water flow in the direction of the device 1 and the resulting change in direction of the water flow.

The device 1 is particularly suitable as a so-called "moving chamber", wherein it is continuously moved along the filter tube 10, during which the pumping device 20 is in operation and thereby as explained water is pumped out of the two sampling chambers 18.1, 18.2. Such an operation of the device 1 leads to an extremely effective pore space stimulation within the Hinterschüttungen the annulus area 62 and the mountains 64, because the water flow, relative to a certain point within the mountains 64 and the annular space 62, then changes by up to 180 ° , As a result, 64 more particles can be discharged through the pore channels of the annulus 62 and the mountains. The said direction reversal of the flow of 180 ° takes place in particular in the areas II, which in the representations of Fig. 3 and Fig. 13 are symbolized.

On the lower end side 27u of the outer tube 26 connecting means 58 (see. Figure 4 ), which allow the attachment of other equipment to the device for well treatment. For example, the connecting means 58 may be formed as a ring element, a hook or the like. The other equipment for well treatment may be a pulse generator, are introduced by the hydromechanical pulses in the well. For the sake of simplicity, the connection means 58 are only in the Fig. 4 shown, but in Fig. 3 and Fig. 13 Not shown.

Finally, it should be pointed out that, depending on the geometrical dimensions of the grain filter and the grain sizes of a respective well, it is possible with the device 1 according to the invention in a structurally simplest manner to variably set an axial height of the solids and a respective height of the removal chambers and thus one ensure optimal use of the device 1.

Claims (15)

1. A device (1) for activating or purifying filter tube wells with a filter tube (10), comprising
   a first volume body (12) and a second volume body (13), wherein the volume bodies (12; 13) with their respective outer diameter are substantially adjustable to the inner diameter of the filter tube (10), and on their outer circumferential surface each comprise sealing means (16), by means of which a sealing effect with respect to the inner wall of the filter tube (10) can be achieved, and
   at least one removal chamber (18), which can be formed between the first and second volume body (12; 13) and the inner wall of the filter tube (10), wherein the removal chamber (18) can be hydraulically connected to a pumping device (20), and during an operation of the pumping device (20) water can be pumped from the removal chamber (18), wherein
   between the first and second volume body (12; 13) in longitudinal direction of the device (1) two removal chambers (18.1; 18.2) in the form of an upper removal chamber (18.1) and a lower removal chamber (18.2) are formed, which are hydraulically separated from each other, and can each be connected to the pumping device (20) by separate hydraulic connections (22; 24),
   and wherein an intermediate tube is arranged,
   characterised in
   that along the longitudinal axis of the device (1) an external tube (26) is provided, wherein the volume bodies (12; 13) can be attached to an outer circumferential surface of the external tube (26), and that inside the external tube (26) the intermediate tube (36) is arranged coaxially, wherein between the external tube (26) and the intermediate tube (36) an outer annular space (38) is formed.
2. The device (1) according to claim 1, characterised in that within the external tube (26) an internal tube (44) is arranged coaxially, wherein the internal tube (44) extends within the intermediate tube (36), and thus an inner annular space (46) is formed between the internal tube (44) and the intermediate tube (36), wherein the upper removal chamber (18.1) is connected hydraulically either with the inner annular space (46) or with the inside of the intermediate tube (36), and the lower removal chamber (18.2) is connected hydraulically either with the inside of the intermediate tube (36) or with inner annular space (46) so that the inner annular space (46) and the internal tube (44) for the removal chambers (18.1; 18.2) each form separate hydraulic connections (22; 24) to the pumping device (20).
3. The device (1) according to claim 2, characterised in that in the wall of the external tube (26) adjacent to the removal chambers (18.1; 18.2) recesses (A₂₆) are formed extending parallel to the longitudinal axis (L) of the external tube (26), wherein in the wall of the intermediate tube (36) adjacent to the upper removal chamber (18.1) recesses (A₃₆) are formed extending parallel to the longitudinal axis (L) of the external tube (26) and opposite to the recesses (A₂₆) of the external tube (26), wherein connecting channels (40) are leading from the recesses (A₂₆) of the external tube (26) radially through the outer annular space (38) to the recesses (A₃₆) of the intermediate tube (36) each opposite to them so that the upper removal chamber (18.1) is connected hydraulically with the inner annular space (46) and is hydraulically separate from the outer annular space (38), preferably that the connecting channels (40) between the recesses (A), which are formed in the individual tubes opposite to each other, are each formed by rectangular tubes (42K; 42L) extending with their longitudinal axis parallel to the longitudinal axis (L) of the device (1) and extending radially between the opposite recesses (A) in order to form a hydraulic connection in-between.
4. The device (1) according to claim 2 or 3, characterised in that the internal tube (44) within the external tube (26) extends in axial length at least up and into the area of the lower removal chamber (18.2), wherein in the wall of the internal tube (44) adjacent to the lower removal chamber (18.2) recesses (A₄₄) are formed extending parallel to the longitudinal axis (L) of the external tube (26) and opposite to the recesses (A₂₆) of the external tube (26), wherein connecting channels lead from the recesses (A₂₆) of the external tube (26) radially through the annular space (48), formed between the internal tube (44) and the external tube (26), and to the recesses (A₄₄) of the of internal tube (44) each opposite to them so that the lower removal chamber (18.2) is connected hydraulically with the inside of the internal tube (44) and is hydraulically separate from the annular space (48) between the internal tube (44) and the external tube (26), preferably that the intermediate tube (36) intersperses the external tube (26) from an upper end of the device (1) up to approximately a central area of it, more preferably that the internal tube (44) intersperses the external tube (26) substantially along its entire length.
5. The device (1) according to any one of claims 2 to 4, characterised in that the external tube (26) is open on its outer end sides (27o, 27u), wherein the hydraulic connection (HV) between the outer end sides (27o, 27u) of the external tube (26) extends through the outer annular space (38) and the annular space (48) formed between the internal tube (44) and the external tube (26).
6. The device (1) according to any one of claims 1 to 5, characterised in that in the area of the removal chambers (18.1; 18.2) on the outer circumferential surface of the external tube (26) spacers (28) each are attached by means of which a spacing of the volume bodies (12; 13) to each other and thus a radial inflow of water into the removal chambers (18.1; 18.2) is guaranteed, preferably that the spacers (28) can be displaced relative to the external tube (26) in the direction of the longitudinal axis of the device (1) and can be fixed on the external tube (26) in a predetermined position.
7. The device (1) according to claim 6, characterised in that the spacers (28) are shaped in the form of annular baskets (30) comprising two annular elements (32) which are spaced apart from each other in axial direction of the device (1) by webs (34), wherein a distance of the two annular elements (32) to each other defines an axial height (h) of a respective removal chamber (18.1; 18.2).
8. The device (1) according to any one of claims 1 to 7, characterised in that the wall of the external tube (26) on its upper end side (27o) along the circumference is formed with perforations (54) so that particles, especially sand, sediments or the like, can fall into the external tube (26) through the perforations (54) and thus deposits on an upper end side (27o) of the external tube (26) are avoided, preferably that the perforations are formed by holes (54) or the like.
9. The device (1) according to any one of claims 1 to 8, characterised in that a third central volume body (14) is provided, which is located between the upper removal chamber (18.1) and the lower removal chamber (18.2), wherein the third volume body (14) with its outer diameter is substantially adapted to the inner diameter of the filter tube (10), and comprises sealing means (16) on its outer circumferential surface with which a sealing effect with respect to the inner wall of the filter tube (10) can be adjusted, preferably that the third volume body (14) can be attached to an outer circumferential surface of the external tube (26).
10. The device (1) according to claim 3 or any one of claims 3 to 9 with relation to claim 3, characterised in that an axial length (I) of the recesses (A) formed in the individual tubes and an axial length of the adjacent connecting channels (42K; 42L) is greater than an effective axial height (h) of an adjacent removal chamber (18.1; 18.2), wherein part of the recesses (A) formed in the external tube (26) can be covered by the volume bodies (12; 13) at the end and/or by the central volume body (14).
11. The device (1) according to any one of claims 1 to 10, characterised in that the first, second and/or third volume body (12; 13; 14) can be displaced relative to the external tube (26) in the direction of a longitudinal axis (L) of the device (1) and can be fixed on the external tube (26) in a predetermined position.
12. The device according to claim 11, characterised in that the volume bodies (12, 13, 14) and at least one annular basket (30) are attached on the external tube (26) immediately adjacent to each other and thereby are in contact with each other with their axial end sides, wherein clamping devices (29o, 29u) can be attached on the external tube (26), which are in contact with the outer end sides of the first and second volume body (12, 13), and thus fix with respect to an axial position on the external tube (26) both the first and second volume body (12, 13) and also the at least one annular basket (30) and, if required, other parts, which are attached on the external tube (26) between the first and second volume body (12, 13).
13. The device (1) according to any one of claims 1 to 12, characterised in that the sealing means (16) on the respective outer circumferential surfaces of the volume bodies (12; 13; 14) or the volume bodies (12; 13; 14) themselves comprise open-cell foam material or bristles in order to guarantee a sufficient sealing effect with respect to the inner wall of the filter tube (10), preferably that the sealing means (16) and/or the volume bodies (12; 13; 14) consist of open-cell foam material or bristles.
14. The device (1) according to claim 13, wherein the sealing means and/or the volume bodies comprise a variable volume, wherein by supplying a fluid into the volume, the sealing means can be enlarged radially outward.
15. A method for activating or purifying filter tube wells with a filter tube (10), wherein a device (1) according to any one of claims 1 to 14 along the filter tube is constantly moved upward or downward and thereby by means of the pumping device (20) water is simultaneously conveyed and discharged from the two removal chambers (18.1; 18.2) of the device (1).

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