EP2952640A1 - Device for activating or purifying wells - Google Patents

Abstract

The invention relates to a device (1) for activating or cleaning filter tube wells with a filter tube, comprising a first and a second volume body (12, 14) which are adapted with its outer diameter substantially to the inner diameter of the filter tube and on its outer peripheral surface each sealing means (16), by means of which a sealing effect between the solids (12, 14) and the inner wall of the filter tube is adjustable, a removal chamber formed between the first and second volume body (12, 14) and the inner wall of the filter tube (10) 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 faces of the two solids (12, 14) opposite to the removal chamber, namely by an annular space which completely penetrates at least the removal chamber in the direction of the longitudinal axis of the device (1) and between an outer tube (26) and within the outer tube (26) arranged inner tube (27) is formed.

Description

The invention relates to a device for activating or cleaning wells.

In the production of filter strands in the ground to promote groundwater it is necessary after completion of the well structure, out of the introduced into an annulus between the filter chamber and the borehole edge filter gravel and the borehole edge pollutions and auszufördern by Suffosion sand grains of small diameter. The discharge of such 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.

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 separation of various methods and devices are known that make use of hydromechanical, hydropneumatic and chemical principles of action.

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 for entering 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. For geometrically limiting the chamber opening in the filter tube, sealing bodies are required at their ends, which are designed either as sealing disks or as volume-variable (inflatable) annular hoses. Here is one Longitudinal extension of this seal body or its length in relation to the length of the open chamber attached 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 20 151 , 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.

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 origin, and thus layered by different permeabilities Marked are. 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 part of a groundwater flowing hydraulically contiguous by groundwater 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.

Accordingly, the invention has for its object to provide a device for activating or cleaning wells, in which sets by simple mechanical means an automatic control of flow rates above and below a sampling chamber with improved volume throughput.

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

A device according to the invention serves for activating or cleaning filter tube wells with a filter tube, and comprises a first and a second volume body, which are adapted with their outer diameter substantially to the inner diameter of the filter tube and on their outer peripheral surface each have sealing means by means of which a sealing effect between the Volumes and the inner wall of the filter tube can be adjusted. The device further comprises a removal chamber, which is formed between the first and second volume body and the inner wall of the filter tube, said extraction chamber can be hydraulically connected to a pumping device. For the device, a hydraulic connection between the areas is provided, each adjacent to the extraction chamber to the opposite outer end faces of the two solids. This hydraulic connection extends at least through an annular space, which completely passes through the removal chamber in the direction of a longitudinal axis of the device and is formed between an outer tube and an inner tube arranged inside the outer tube.

The present invention is based on the essential knowledge that a hydraulic connection to ensure a flow balance between the regions of the filter tube above and below the device, that is formed between the regions which adjoin each of the outer end faces of the two solids opposite the extraction chamber, by an annular space which completely penetrates at least the removal chamber in the direction of the longitudinal axis of the device. Such an annulus has an increased cross-sectional area transverse to the longitudinal axis of the device as compared to a prior art compensating tube, thus allowing a larger volume flow rate for improved flow compensation. The design of such an annular space between the inner tube and the outer tube is also mechanically very robust and can be realized with simple and inexpensive means.

In an advantageous embodiment of the invention, the outer tube may extend along the entire longitudinal axis of the device. Here, the outer tube forms a structural or supporting component for the device according to the invention, to which further components can be attached, for. B. the inner tube and the two solids.

In an advantageous embodiment of the invention, both the outer tube and the inner tube can each extend along the entire longitudinal axis of the device. Here, the outer tube and the inner tube are chosen approximately the same length. A centric positioning of the inner tube within the outer tube is ensured via radial web elements or the like. Such an embodiment of the device has the advantages that on the one hand the inner tube is guided to the lower end side of the outer tube, so that on the lower end side of the inner tube further units or devices for treating the Filterrohrbrunnens can be attached, for. B. a pulse generator or the like. Furthermore, supply lines for e.g. be passed through the pulse generator.

In an advantageous embodiment of the invention, the device has a delivery line, which opens into the removal chamber urid can be hydraulically connected to a pumping device. By operation of the pumping device In the delivery line, a negative pressure can be generated, as a result of which water is discharged from the filter tube well through the removal chamber. In this context, it should be noted that the pumping device is optionally part of the device according to the invention. If desired, the pumping means may also be installed for days, ie outside the filter tube well, which reduces the weight of the device and facilitates its handling within the filter tube. In this case, a hydraulic connection between the delivery line and the pumping device is ensured by suitable pipe connections, lines or the like. These tube connections also ensure length compensation when the device is moved or displaced in the longitudinal direction of the filter tube.

In an advantageous embodiment of the invention, the delivery line is formed by the inner tube. In other words, the inner tube fulfills a dual function: The inner tube is hollow, so that well water can be discharged through the inner tube, wherein the inner tube serves as a delivery line. At the same time, the inner tube with its outer circumferential surface forms an inner part within the outer tube, for the formation of the above-described annular space. In this embodiment of the invention in the region of the removal chamber in the walls of both the inner tube and the outer tube respectively adjacent to each other recesses are formed, at least one recess in each case. A connecting channel leads from the recess of the inner tube radially outward through the annular space to the recess of the outer tube, whereby the delivery line - in the form of the inner tube - is hydraulically connected to the removal chamber and at the same time is hydraulically separated from the annulus. This makes it possible that well water passes radially from the outside through the sampling chamber and through the connecting channel in the conveying line in the form of the inner tube, and at the same time hydraulically separated from a volume flow within the annular space between the inner tube and the outer tube in the direction of the longitudinal axis of the device is possible ,

Expediently, more than just one recess is formed in the wall of the inner tube, namely at least two recesses, preferably three, more preferably also four recesses. In correspondence with this, then the delivery line in the form of the inner tube by two connecting channels, and possibly three or preferably also four connecting channels, hydraulically connected to the removal chamber, said connecting channels as explained pass through the annular space each radially and the adjacent recesses of the inner tube and the Connect outer tube together. A preferred embodiment of the invention provides in this context four connecting channels, wherein for this purpose in the walls of the inner tube and the outer tube corresponding recesses along the circumference are formed every 90 °.

In an advantageous embodiment of the invention, the two solid bodies may be formed as a sleeve, and thus be pushed onto an outer peripheral surface of the outer tube. This allows attachment of the two solids on the outer peripheral surface of the outer tube. In this case, a height of the removal chamber or a distance between the two solid bodies can be adjusted relative to each other in the direction of the longitudinal axis of the device, if at least one of the two volume body is displaceable relative to the outer tube in the direction of the longitudinal axis of the device. After such displacement of this volume body to set a desired height of the extraction space, this volume body may be secured by suitable locking means, e.g. be fixed or clamped back to the outer tube by a screw or the like.

The just mentioned embodiment of the invention, in which the two solid bodies are mounted on the outer peripheral surface of the outer tube, has the advantage of a robust and simple structure, which is also inexpensive to implement. Here, the outer tube serves as a structural component for the device to which the two solid bodies are attached as explained.

In an advantageous embodiment of the invention, the sealing means on the outer peripheral surfaces of the solid can have a flexible layer of a foam. Here, the foam of an open-cell foam or be formed of a foam rubber. Such a condition of the sealant results in an interaction with the structure of the winding wire filter or the filter tube of the filter tube well to an intense sealing effect, because the foam can nestle into the interstices of the winding wires inside.

In an advantageous embodiment of the invention, the sealing means may have a variable volume. This means that the sealing means are provided by supplying a fluid, e.g. Compressed air or water, can be increased in volume and thereby widened radially outwards. This is at steady-state operation of the device within the filter tube well, i. at a fixed and predetermined position within the filter tube, expedient, because the radial expansion of the sealing means the desired sealing effect between the solids and the filter tube is optimized. Conversely, this means that by discharging fluid from the variable volume of the sealant 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 both have a variable volume and on the outer circumferential surface of a flexible layer of foam is attached. This leads to a superposition of the above-mentioned advantages with respect to the one hand, the flexible layer of foam and on the other hand, a targeted expansion or reduction of the sealant in the radial direction. An additional advantage to this combination is that an outer peripheral surface of the variable volume of the sealant is less susceptible to damage by the attachment of the flexible layer of foam when it comes into contact with the filter tube when a fluid is supplied into the variable volume.

In an advantageous embodiment of the invention, the inner tube in the region of the upper first volume body protrude beyond the outer tube and be equipped on its front side with first connecting means, which allow a connection of other pipes or the like. This is especially true advantageous if, as explained, the inner tube simultaneously fulfills the function of a delivery line through which well water is discharged during operation of the pumping device. For this case, pipe connections, lines or the like, which are introduced from above or from outside into the filter tube of the well, are suitably connected to the feed line in the form of the inner tube.

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. 3.1

eine seitliche Explosionsansicht einer erfindungsgemäßen Vorrichtung,

Fig. 3.2

eine seitliche Explosionsansicht einer erfindungsgemäßen Vorrichtung nach einer weiteren Ausführungsform,

Fig. 4

eine Perspektivansicht eines Aussenrohrs der Vorrichtung von Fig. 3.1 bzw. Fig. 3.2,

Fig. 5

eine Querschnittsansicht entlang der Linie A-A von Fig. 5,

Fig. 6, Fig. 7

Seitenansichten der Vorrichtung gemäß Fig. 3.1 bzw. Fig. 3.2, jeweils in teilmontiertem Zustand,

Fig. 8.1

eine Querschnittsansicht entlang der Linie B-B von Fig. 6 bzw. Fig. 7,

Fig. 8.2

eine Querschnittsansicht entlang der Linie C-C von Fig. 6 bzw. Fig. 7,

Fig. 9

eine Seitenansicht einer Vorrichtung gemäß Fig. 3 bzw. Fig. 4 in montiertem Zustand,

Fig. 10

eine Seitenansicht der Vorrichtung von Fig. 9, mit vermindertem Abstand zwischen den beiden Volumenkörpern,

Fig. 11

eine Querschnittsansicht entlang der Linie D-D von Fig. 10,

Fig. 12

eine seitliche Schnittansicht der erfindungsgemäßen Vorrichtung von Fig. 3, wenn diese in einen Filterrohrbrunnen eingebracht ist,

Fig. 13

eine weitere seitliche Schnittansicht der erfindungsgemäßen Vorrichtung von Fig. 12, mit geänderter Schnittführung,

Fig. 14

eine seitliche Schnittansicht einer erfindungsgemäßen Vorrichtung, wobei Strömungsanteile in einem Filterrohrbrunnen idealisiert dargestellt sind, und

Fig. 15

eine seitliche Schnittansicht einer erfindungsgemäßen Vorrichtung in einem Filterrohrbrunnen, wobei praxisrelevante Strömungsanteile in dem Filterrohrbrunnen dargestellt sind.

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. 3.1

a side exploded view of a device according to the invention,

Fig. 3.2

FIG. 4 shows a side exploded view of a device according to the invention according to a further embodiment, FIG.

Fig. 4

a perspective view of an outer tube of the device of Fig. 3.1 respectively. Fig. 3.2 .

Fig. 5

a cross-sectional view along the line AA of Fig. 5 .

Fig. 6, Fig. 7

Side views of the device according to Fig. 3.1 respectively. Fig. 3.2 , each in partially assembled condition,

Fig. 8.1

a cross-sectional view along the line BB of Fig. 6 respectively. Fig. 7 .

Fig. 8.2

a cross-sectional view taken along the line CC of Fig. 6 respectively. Fig. 7 .

Fig. 9

a side view of a device according to Fig. 3 respectively. Fig. 4 in assembled condition,

Fig. 10

a side view of the device of Fig. 9 , with reduced distance between the two solids,

Fig. 11

a cross-sectional view along the line DD of Fig. 10 .

Fig. 12

a side sectional view of the device according to the invention of Fig. 3 when placed in a filter tube well,

Fig. 13

a further sectional side view of the device according to the invention of Fig. 12 , with modified cut,

Fig. 14

a sectional side view of a device according to the invention, wherein flow portions are shown in a filter tube well idealized, and

Fig. 15

a side sectional view of a device according to the invention in a filter tube well, with practice-relevant flow components are shown in the filter tube well.

In the Fig. 3 to Fig. 8 a basic structure of preferred embodiments of a device 1 according to the invention is explained which serves to activate or clean filter tube wells with a filter tube.

Fig. 3 shows the device 1 according to a first embodiment with its essential components. The device 1 comprises a first volume body 12 and a second volume body 14, each of which is sleeve-shaped. At the outer end faces of these solid bodies 12, 14 respectively annular discs 15 or the like are provided, which have a slightly larger diameter compared to the solid bodies themselves. The device 1 further comprises sealing means 16, which can be mounted on the respective bulbs 12, 14. For such a mounting of the sealing means 16 on the solids 12, 14, the annular discs 15 ensure an exact positioning of the sealing means 16 with respect to a longitudinal axis of the solid 12, 14, and thus prevent sliding of the sealing means 16 in the direction of this longitudinal axis. The structure and operation of the sealing means 16 are explained below in detail.

The device 1 further comprises an outer tube 26 and an inner tube 27. The diameter of the outer tube 26 is larger than the diameter of the inner tube 27 is selected, for. B. twice as large. In any case, the difference between the diameters of these two tubes is dimensioned such that the inner tube 27 can be received within the outer tube 26 and thereby passes through the outer tube 26 in the direction of a longitudinal axis L of the device 1.

The representation of Fig. 3 illustrates that the inner tube 27 is formed longer than the outer tube 26. The axial length of the two solid bodies 12, 14 is in each case smaller than the length of the outer tube 26, and is for example one third thereof. In this context, it should be noted that the representations of the device 1 in the drawing are not to scale, and that all said length data or ratios are to be understood as exemplary only.

In a central region of the outer tube 26 at least one recess 32 _{A is} formed in the wall W _A , through which a connection between an inner side and an outer side of the outer tube 26 is present. Expediently, four such recesses 32 _{A are} formed along the circumference of the wall W _{A of} the outer tube 26. This is in the perspective view of Fig. 4 of the outer tube 26, in conjunction with the cross-sectional view along the line AA of Fig. 4 , in the Fig. 5 is shown. In the form of these four recesses 32 _A are defined for the outer tube 26 along its circumference uniform passages to all sides.

In the same way as for the outer tube 26 and the inner tube 27 is provided in its wall W _I with at least one recess 32 _I. Conveniently, a total of four such recesses 32 _{I are} provided analogously to the outer tube 26 and the inner tube 27, which are uniformly distributed over the circumference of the inner tube 27 and so far define passages between an inner side and an outer side of the inner tube 27 to all directions. Such a distribution of these recesses 32 _I in the inner tube 27 is in the same Way as for the outer tube 26 in the 4 and FIG. 5 so that reference may be made to avoid repetition.

With respect to the embodiment according to Fig. 3.1 It should be noted that the inner tube 27 is hollow, and in a portion below the recesses 32 _{I has} a bottom member 28. By means of this bottom element 28 it is ensured that the area of the inner tube 27 adjacent to the recesses 32 _{I is} hydraulically separated from the region of the inner tube 27 which joins below these recesses 32 _I in the direction of the lower end side 27u of the inner tube 27.

The inner tube 27 is formed open at its upper end side 27 o, and has there first connecting means 36 (FIG. Fig. 6 ) in order to connect it to other pipe joints, pipes, hoses or the like. As already explained above, the inner tube 27 is hollow, with this cavity extending to said base element 28. In this way, the inner tube 27 forms a delivery line 30, whose operation is explained in detail below.

Fig. 3.2 shows a further embodiment of the device 1 according to the invention. Insofar as their features and components that of the embodiment of Fig. 3.1 correspond, the same reference numerals are used and not explained again. The embodiment according to Fig. 3.2 includes an inner tube 27.2, compared to the inner tube 27 of Fig. 3.1 axially shorter. This means that the lower end side 27u of the inner tube 27.2 connects directly below the recesses 32 _I.

The Fig. 6 to 8 illustrate a partial assembly of the devices 1 according to Fig.3.1 respectively. Fig. 3.2 ,

Fig. 6 shows a side view of the device 1 according to Fig. 3.1 , in partially assembled condition. Here, the first volume body 12 and the second volume body 14 are pushed onto an outer peripheral surface of the outer tube 26, and there suitably fastened. The outer tube 26 is formed open at its two outer end faces 26o, 26u, respectively. The inner tube 27 is inserted within the outer tube 26, and thus passes through the outer tube 26 substantially along the entire longitudinal axis L of the device 1. Here, the inner tube 27 is received within the outer tube 26 so that between an outer peripheral surface of the inner tube 27 and an inner peripheral surface of the outer tube 26 forms an annular space 25. This annulus 25 is in Fig. 8.1 which is a cross-sectional view along the line BB of FIG Fig. 6 represents. A central centering of the inner tube 27 within the outer tube 26 is ensured via suitable radial webs or the like (not shown). The operation of this annulus 25 is explained below in detail.

Fig. 7 shows a side view of the device 1 according to Fig. 3.2 , in partially assembled condition. The only difference compared to the embodiment or the representation of Fig. 6 is that the inner tube 27 as in Fig. 3.2 explained is formed shorter in the axial direction. Accordingly, the lower bottom surface 28 is adjacent to an upper end side of the second volume body 14. Here, the outer tube 26 is hollow along the second volume body 14 and thus also forms part of the hydraulic connection between the two outer end faces 22, 24 of the device.

The Figures 8.1 and 8.2 make clear the configuration of the outer tube 26 and the inner tube 27 with the recesses 32 _A , 32 _I. In detail, the outer tube 26 and the inner tube 27 are in Fig. 8.1 in a cross-sectional view along the line BB of Fig. 6 respectively. Fig. 7 , and in Fig. 8.2 in a cross-sectional view along the line CC of Fig. 6 respectively. Fig. 7 shown. The inner tube 27 is arranged centrally within the outer tube 26, so that an annular space 25 is formed between these two tubes ( Fig. 8.1 ). In the central region of the outer tube 26 and the inner tube 27 are the recesses 32 _A , 32 _I respectively by connecting channels 34 (FIG. Fig. 8.2 ) connected with each other. These connection channels 34 ensure that an outer region of the outer tube 26 is hydraulically separated from the annular space 25 with an inner region of the inner tube 27 is connected. In this way, water can flow from the outside through the recesses 32 _A , 32 _I and flow through the connecting channels 34 in the inner tube 27, without thereby entering the annulus 25 into it. In this case, water can flow through the annular space 25 in the longitudinal direction of the inner or outer tube and thus in the direction of the longitudinal axis L of the device, without interfering with the water which radially from the outside through the recesses 32 and the connecting channels 34 into the inner tube 27 or in the delivery line 30, come in to mix.

The connection channels 34 are adjacent to the first volume body 12 and adjacent to the second volume body 14 with a ridge 35 (FIG. Fig. 8.2 ), which is due to the fact that the recesses at their axial ends - as shown in the side view Fig. 6 respectively. Fig. 7 to recognize - each having the shape of an outward triangle. The function and purpose of this ridge 35 are explained in detail below.

In the Fig. 9 to 11 Further details regarding the attachment of the volume body 12, 14 on the outer tube 26 and with respect to the configuration of the sealing means 16 are explained.

Fig. 9 shows a side view of the device 1 in the assembled state. In this case, the two volume bodies 12, 14 are attached to the outer tube 26 such that a distance h _{1 is} established between the opposite end faces of these volume bodies 12, 14. As a result, the recess 32 _A is substantially completely released.

Fig. 10 shows the device 1 of Fig. 9 in a modified operating position, when the upper first volume body 12 is displaced along the outer tube 26 in the direction of the lower second volume body 14, so that a distance h ₂ between the opposite end faces of these two solids is reduced. As a result, the recess 32 _{A is} partially covered by the first volume body 12. By moving the first volume body 12 along the outer tube 26 can as by the Fig. 9 and Fig. 10 illustrates a distance h between the two solids 12, 14 are changed as desired. A fixing of the first volume body 12 to the outer tube 26 after such displacement can by suitable (and not shown) clamping means, for. B. by a screw, done.

The sealing means 16, which are provided on an outer periphery of the first and second volume body 12, 14, comprise a flexible layer 16.1 in the form of a foam, which is applied to an outer peripheral surface of a variable volume 16.2. This is in the Fig. 11 FIG. 12 illustrates a cross-sectional view taken along the line DD of FIG Fig. 10 shows. The variable volume 16.2 can be achieved by adding or removing a fluid, for. As compressed air or water, to be changed in volume. In the simplest case, the variable volume 16.2 may be formed as a rubber body or the like. The variable volume 16.2 of the upper first volume body 12 is connected to a supply line 38, for a supply and discharge of a fluid. The variable volume 16.2 of the lower second volume 14 is supplied with the fluid via an additional line 39, which branches off from the variable volume 16.2 of the upper first volume body 12. In this way it is possible, by supplying fluid, for example compressed air or water, through the supply line 38, to expand the variable volumes 16. 2 of both volutes 12, 14 radially to the outside. The flexible layer 16.1 is designed to be elastic enough to adapt to such a deformation of the variable volume 16.2.

Fig. 12 shows a simplified representation of the device 1 when it is placed in a filter tube well with a filter tube 10. The filter tube 10 of the Filterrohrbrunnens may consist of stainless steel and has usually winding wires, which form a wall of the filter tube 10. Through the interstices of these winding wires well water can flow radially from the outside into the filter tube 10.

The inner tube 27 is connected via a plurality of radial support webs 29 (FIG. Fig. 12 ) centered within the outer tube 26 and thereby secured within the outer tube 26.

Between an inner wall of the filter tube 10 and the first and second solids 12, 14, a removal chamber 18 is formed. A height h of the extraction chamber 18, in the direction of the longitudinal axis L of the device 1, is defined by the distance of the two solid bodies 12, 14 relative to each other. Adjacent to the removal chamber 18 are the recesses 32 in the outer tube 26 and the inner tube 27, with the result that well water can flow radially from the outside in the region of the sampling chamber 18 in the inner tube 27. As already explained, in this case serves the inner tube 27 as a delivery line 30, which is connected by a connecting line 21 which is connected via the first connecting means 36 on the upper end side 27o of the inner tube 27 with a pumping device 20.

The cutting guide through the device 1 according to Fig. 12 is selected so that in the central region of the device 1, the recesses 32 in the wall of the outer tube 26 and the inner tube 27 are shown. In detail, these recesses 32 _A , 32 _I in Fig. 12 simplified symbolized by dashed lines. In contrast, the device 1 in the illustration of Fig. 13 shown in another sectional plane, which again illustrates the annular space 25 in the central region of the device 1, which is formed between the outer tube 26 and the inner tube 27 and the extraction chamber 18 completely penetrates in the direction of the longitudinal axis L of the device. Through the annular space 25, a water flow in the longitudinal direction of the device 1 is possible, namely between the two outer end faces 22, 24 of the outer tube 26th

On the lower end side 27u of the inner tube 27 (FIG. Fig. 6 ) or on an outer end face 26u of the outer tube 26 (FIG. Fig. 7 ) Second connecting means 37 may be provided, on which further aggregates for the well treatment can be attached, for. B. a pulse generator. In such a mounting of a pulse generator or the like on an underside of the device 1, the annular space 25 is advantageous, because then a supply line through the annulus 25 can be passed through to the pulse generator without this, the radial flow of water from the well through the Removal chamber 18 in the inner tube 27 influenced.

When passing such supply lines through the annular space 25, it is ensured, with respect to the connecting passages 34 passing radially through the annular space 25, by their ridges that a front side or a front end of such supply lines slides on the ridge 35. This prevents snagging or jamming on the connecting channels 34.

Below are with reference to Fig. 14 the use of the device 1 within a filter tube well or its filter tube 10 and the resulting flow conditions explained in detail. For simplicity, the device 1 in the Fig. 14 only shown in a half-section along its longitudinal axis L.

In the presentation of Fig. 14 the device 1 is completely inserted into a filter tube well or its filter tube 10. The filter tube 16 is surrounded by an annulus area 40 which is filled with a gravel bed. The annulus area 40 is in turn surrounded by adjacent mountains 42. The device 1 is flown out of the mountains 42 above the first volume body 12 by a volume of water. The same applies to an area below the second volume body 14, which is flown out of the mountain 42 out of a volume of water Z _o . By formed between the outer tube 26 and the inner tube 27 annular space 25, it comes within the device 1 along its longitudinal axis L to a compensation current Q _AR . Such a compensation current Q _{AR passes} through the annular space 25 and - in the case of the embodiment according to Fig. 3.2 Also, the lower portion of the outer tube 26 adjacent to the second volume body 14 and thereby creates a hydraulic connection between the areas adjacent to the outer open end faces of the volume body 12, 14.

The device 1 is flowed over from the outer Stirnseitenbereichhe 22, 24 of the outer tube 16 along its longitudinal axis L in the direction of the removal chamber 30, wherein this flow around the filter gravel layer within the annulus area 40 passes through and in Fig. 14 is denoted by Q _o or Q _u . The Flow around Q _o and Q _u along the volume body 12, 14 occurs because the flexible layer 16.1 on the outer peripheral surfaces of the volume body 12, 14 leads to a sealing effect against an inner wall of the filter tube 16.

The above-described hydraulic connection by means of the annular space 25 causes the flow components Q _o (to flow around the upper first volume body 12) and Q _u (to the flow around the lower second volume body 14) assume approximately the same values. This is the case in particular if different flow resistances prevail in the aquifer in the region of the rock 42 above and below the removal chamber 30 due to irregular rock composition, so that the water volume flows Z _o and Zu are of different sizes.

The bypasses Q _o and Q _u pass into the removal chamber 18 after flowing past the two solids 12, 14. In addition, a direct radial inflow Q _r from the rock 42 passes through the annulus area 40 into the removal chamber 18 ( Fig. 12 . Fig. 13 ), a negative pressure is generated in the delivery line 30. As a result, a withdrawal stream Q _k (from the withdrawal chamber 18 ( _FIG. Fig. 14 ) and transported over days.

The annular space 25 between the outer tube 26 and the inner tube 27 causes an automatic Saugstromsteuerung, which may vary large volume of water flows Z _o and Z _u, the flow onto the device 1 above and below the two solid bodies 12, 14 on equal Umströmungen Q _o and Q _u , which enter the extraction chamber 18 outside along the two solids through the annulus area 40. This ensures an almost uniformly intensive cleaning action in the region of the two solids 12, 14. The amount of water that is available in total in the filter tube 10 is thus in each operating situation and in particular without additional measures approximately similar to the two partial flows in the form of the flow Q _o and Q _u split.

The annular space 25 and the associated hydraulic connection between the outer end faces of the two solids 12, 14 leads to the further advantage that the device 1 can be introduced with less resistance in the filter tube 10 of the filter tube well. As a result of the hydraulic connection, no piston function of the lower second volume body 14 occurs within the filter tube 10, so that less or no water is displaced during displacement of the device 1 within the filter tube 16. The same applies with respect to the upper first volume body 12 in an axial displacement of the device 1 within the filter tube 10 upwards, when the device 1 is already fully inserted into the filter tube well. A movement of the device 1 within the filter tube 10 is thus not against a water resistance, but primarily only against a frictional resistance resulting from the contact of the flexible layer 16.1 with the inner wall of the filter tube 10.

Regarding the representation in Fig. 14 is to be understood that the shown water volume flows Z _o and Zu are shown substantially equal only for the sake of simplicity. In practice, these water volume flows Z _o and Zu will assume mostly different values due to different resistances within the aquifer in the form of rock 42, so that, as explained above, a pressure or flow compensation through the annulus 25 occurs. With reference to the Fig. 15 is explained below, as a pressure or flow compensation through the annulus 25 at different water volume flows Z _o and Zu expires.

The device 1 is in Fig. 15 shown in a side cross-sectional view along its longitudinal axis, similar to the representation of Fig. 14 or the Figures 12 and 13 .. Fig. 15 illustrates a pressure or flow compensation through the annulus 25 in the event that due to different resistances within the aquifer in the form of mountains 42, for example, the water volume flow Z _o above the upper volume body 12 is greater than the water volume flow Z _u below the second volume body 14th Accordingly, there is a pressure or flow compensation through the annulus 25 down, which in FIG. 15 indicated by arrows accordingly. Using the example of the water volume flow Z _o , it can be seen that, starting from the rock 42, it enters the filter tube 10 radially through the filter gravel annulus area 40 and then flows vertically downward in the filter tube 10 to the upper end side of the volume body 12. Now enters a part of this water volume flow Z _u in the annular space 25 between the outer tube 26 and the inner tube 27 to escape after flowing through the annular space 25 at the lower end face 26u of the outer tube 26 again. In a short way then passes this flow portion radially outward through the filter tube 10 through into the annulus area 40 to rush back up there in the direction of the sampling chamber 18 before unification with the other flow components (Q _R , Q _o , Q _u ) in the removal chamber 18 takes place. Finally, the negative pressure generated by the pumping device 20 in the delivery line 30 and the inner tube 27 causes a discharge of well water from the extraction chamber 30 through the delivery line 30. It is understood that the flow conditions for the example explained here, according to which the water volume flow Z _o larger as the water volume flow Zu, mutatis mutandis also apply to the reverse case, namely, when the water volume flow Z _{o is} smaller than the water volume flow Z _u .

A displacement of the device 1 within the filter tube 10 in a further operating position is facilitated by the fact that the variable volume 16.2 of the sealing means 16 can be radially reduced by passing a fluid. After reaching a new operating position of the device 1 within the filter tube 10, the variable volume 16.2 is again radially expanded by supplying fluid. In superposition with this radial expansion, the flexible layer 16.1 in the form of the foam fits tightly against the winding wire filter structure of the filter tube 10, wherein the foam can also penetrate into the interstices of the winding wires. This results in an excellent sealing effect between the outer peripheral surface of the volume body 12, 14 with the filter tube 10th

As an alternative to a combined embodiment of the sealing means 16 with the flexible layer 16.1 and the variable volume 16.2, it is for the present invention also possible that the sealing means 16 are formed only of a flexible layer in the form of foam or the like. This leads to the advantage that then the sealing means act purely passive and do not require the addition or discharge of a control fluid required. By a suitable dimensioning of this foam sealant in diameter on the one hand a good sealing effect in interaction with the filter tube 10 is possible, as well as an axial displaceability of the device 1 in the longitudinal direction of the filter tube well guaranteed.

The device 1 according to the invention has the advantage that for the described pressure or flow compensation between its outer end faces 22, 24, the hydraulic connection in the annular space 25 has a sufficiently large flow cross-section, resulting in an advantageously large volume throughput. The annular space 25 passes through the removal chamber 18 in the direction of the longitudinal axis L of the device 1, wherein the connecting channels 34 are hydraulically separated from the annular space 25 between the recesses 32 of the outer tube 26 and the inner tube 27. The axial length of this annular space 25, in the direction of the longitudinal axis L of the device 1, has no influence on this flow compensation.

Claims (14)

Device (1) for activating or cleaning filter tube wells with a filter tube (10), comprising
a first and a second volume body (12, 14) which are adapted with their outer diameter substantially to the inner diameter of the filter tube (10) and on their outer peripheral surface each have sealing means (16) by means of which a sealing effect between the solids (12, 14 ) and the inner wall of the filter tube (10) is adjustable,
an extraction chamber (18) formed between the first and second volume bodies (12, 14) and the inner wall of the filter tube (10), the extraction chamber (18) being hydraulically connectable to a pumping device (20),
a hydraulic connection between the regions which respectively adjoin the outer end faces (22, 24) of the device (1) which are opposite the extraction chamber (18),
characterized,
in that the hydraulic connection extends at least through an annular space (25) which completely penetrates at least the removal chamber (18) in the direction of the longitudinal axis (L) of the device (1) and is arranged between an outer tube (26) and within the outer tube (26) Inner tube (27) is formed. Device (1) according to claim 1, wherein the outer tube (26) at its respective outer end faces (26o, 26u) and the inner tube at its upper end face (27o) are each open. Device (1) according to claim 1 or 2, wherein the inner tube (27) and the outer tube (26) each extend along the entire longitudinal axis (L) of the device (1). Device (1) according to claim 1 or 2, wherein the outer tube (26) extends substantially along the entire longitudinal axis (L) of the device (1), wherein the inner tube (27) the device (1) only in the region of the first upper volume body (12) and the removal chamber (18) interspersed. Device (1) according to one of Claims 1 to 4, in which a delivery line (30) which can be connected to the pump device (20) opens into the removal chamber (18). Apparatus (1) according to claim 5, wherein the delivery line (30) through the inner tube (27) is formed, wherein in the region of the removal chamber (18) in the walls (W ₁ , W _A ) of the inner tube (27) and the outer tube (26) each adjacent to each other at least one recess (32 _I ; 32 _A ) is formed, wherein a connecting channel (34) from the recess of the inner tube (32 _I ) radially through the annular space (25) through to the recess of the outer tube (32 _A ) leads and thereby the delivery line (30) to the extraction chamber (18) hydraulically connected and from the annular space (25) is hydraulically separated. Device (1) according to claim 6, wherein in the walls (W _I , W _A ) of the inner tube (27) and the outer tube (26) at least two, preferably at least three, more preferably at least four recesses (32 _I ; 32 _A ) are formed, wherein the delivery line (30) with the removal chamber (18) by two, preferably by at least three, more preferably by at least four connecting channels (34) is hydraulically connected, which pass through the annular space (25) each radially and the connect adjacent recesses of the inner tube and the outer tube together. Device (1) according to one of claims 1 to 7, in which the two volume bodies (12, 14) are mounted on an outer peripheral surface of the outer tube (26). Device (1) according to claim 8, wherein the first volume body (12) and / or the second volume body (14) relative to the outer tube (26) in the direction of the longitudinal axis (L) of the device displaceable and in a predetermined position on the outer tube ( 26) can be fixed, whereby a height (h) of the removal chamber (18) in the direction of the longitudinal axis (L) of the device (1) is adjustable. Device (1) according to one of claims 1 to 9, wherein the sealing means (16) on the outer peripheral surfaces of the volume body (12, 14) a flexible layer (16.1) made of a foam, in particular formed from an open-cell foam or a foam rubber, exhibit. Device (1) according to one of claims 1 to 10, wherein the sealing means have a variable volume (16.2), wherein by supplying a fluid into the volume (16.2), the sealing means are radially outwardly enlargeable. Device (1) according to claim 11, as far as dependent on claim 10, in which the flexible layer (16.1) made of foam material is attached to an outer lateral surface of the variable volume (16.2). Device (1) according to one of claims 1 to 12, wherein the inner tube (27) is provided on its upper end face (27o) with first connecting means (36) for connecting further pipelines (42) or the like. Device (1) according to one of claims 1 to 13, wherein the inner tube (27) on its lower end face (27u) or the outer tube in the region of its outer end face (26u) is provided with second connecting means (44) for attaching further devices for well treatment.

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