Filter assembly

Abstract

The invention relates to a filter assembly (1) with a modular arrangement of filter units (6) which are arranged at a distance one above the other in a pipe (5), wherein the pipe (5) is arranged in a shaft which is in the ground. The filter units (6) form a water-permeable wall section of the pipe (5) through which a water exchange with the soil (2) surrounding the pipe (5) is possible. A concentric arrangement of a delivery pipe (8) is provided within the pipe (5) or a peripheral delivery pipe (8) is provided which extends outside the pipe (5). The delivery pipe (8) extends towards the surface of the soil (2) and has an opening (11) there, through which a pump (9) can be introduced.

Description

TECHNICAL FIELD

[0001] The invention relates to a filter assembly. BACKGROUND

[0002] Such filter assemblies are generally used for the treatment and purification of groundwater. To this end, a plurality of filter units are arranged in a shaft in the ground, spaced apart one above the other, which form a filter assembly, wherein with the individual filter units groundwater present in the ground can be purified. It is also possible for the water to be supplied by the filter units via a suitable pipe system with associated pumps to a water pre-treatment unit on the ground.

[0003] In order to ensure the trouble-free functioning of the individual filter units and, in particular, to avoid hydraulic short circuits of the pumps associated with the individual filter units, watertight closures are provided between adjacent filter units in the shaft. In the known filter assemblies, these watertight closures are configured in the form of pneumatic packers. Such pneumatic packers form inflatable units, wherein the pneumatic packers in the inflated state form watertight closures in the intermediate spaces between two adjacent filter units, which extend over the entire cross section of the shaft.

[0004] A disadvantage of such pneumatic packers is that their installation is comparatively laborious. Furthermore, it is disadvantageous that the pneumatic packers have to be maintained at regular time intervals, which involves additional undesirable time and processing expenditure. Furthermore, such pneumatic packers are comparatively expensive.

[0005] It is furthermore disadvantageous that the pneumatic packers are made of a material which is not resistant to the chemical substances present in the water. This means that the pneumatic packers decompose over time and have to be replaced.

[0006] Finally, a major disadvantage of filter assemblies with pneumatic packers is that the number of filter units is limited, since an arbitrary number of pumps cannot be provided in the respective delivery pipes. This is in particular due to the fact that the pumps have to be laboriously installed in the lower region of the delivery pipes. SUMMARY

[0007] The invention is based on the task of providing a filter assembly of the type mentioned at the outset, which has high functionality in a simple, robust construction.

[0008] The invention relates to a filter assembly with a modular arrangement of filter units which are arranged in a tube in a spaced-apart manner one above the other, wherein the tube is arranged in a shaft which is arranged in the ground. The filter units constitute a water-permeable wall section of the tube, through which water exchange with the soil surrounding the tube is possible. A concentric arrangement of delivery pipes is provided within the tube or a peripheral delivery pipe which extends outside the tube. The delivery pipes extend towards the surface of the soil and have openings there, through which a pump can be introduced.

[0009] The main advantage of the invention lies in the modular construction of the filter assembly. The number and type of filter units which are provided for the purification of groundwater present in the soil can be specifically matched to the soil properties of the soil, whereby a high functionality of the filter assembly according to the invention is achieved.

[0010] This flexible modularity is achieved, inter alia, in that the pump can be introduced into the individual delivery pipes from above, i.e. through its opening exposed on the surface of the soil, whereby a particularly simple assembly of the pump is achieved. Thus, a laborious assembly of the pump underground, which limits the number of pumps that can be installed and thus ultimately also the number of filter units in the filter assembly, is dispensed with.

[0011] Advantageously, the assembly takes place in that the pump can be lowered in the delivery pipe to a nominal position which is assigned to the filter unit.

[0012] The nominal position can be formed by a deflection of the delivery pipe. Position-fixing means, such as a bridge, can also project from the inner wall of the delivery pipe, which define the nominal position.

[0013] In general, the delivery pipe into which the pump is introduced is configured for the discharge of water.

[0014] The delivery pipe then constitutes a pump pipe with which the water is pumped upwards from the filter unit and is supplied, inter alia, to a treatment station arranged on the ground, i.e. in a water pre-treatment unit.

[0015] Advantageously, the lower outlet of the delivery pipe is located in the region of the filter unit, from which water can be pumped out.

[0016] In addition, the delivery pipe is configured for the introduction of water.

[0017] In this case, a pump is arranged on the ground, which pumps the water downwards in the delivery pipe and thus supplies the filter unit, inter alia, after treatment in a treatment station, wherein in this case the outlet is advantageously also located in the region of the filter unit.

[0018] Since the delivery pipes are correspondingly configured such that they generally have an upper through- opening which leads above the ground surface and a lower through- opening in the region of the filter unit, these delivery pipes can optionally be used to lead water into or out of the filter unit, wherein the configuration can be changed at any time if required, which can be flexibly matched to different applications. In order to configure a delivery pipe for leading water in, that is to say to configure it as a pump pipe, it is only necessary to introduce a pump into the delivery pipe.

[0019] According to an advantageous embodiment, the filter units are arranged in chambers which are separated from one another in a watertight manner.

[0020] It is expedient here for one delivery pipe to be assigned to one chamber respectively.

[0021] By separating the individual filter units in a watertight manner, it is ensured that each filter unit can be operated without influencing the respective other filter units. In addition, in this way a hydraulic short circuit between the filter units is also avoided.

[0022] According to an structurally advantageous configuration, the longitudinal axis of the delivery pipe extends parallel to the longitudinal axis of the duct, wherein the longitudinal axis of the duct, in turn, extends in a vertical direction.

[0023] The delivery pipes and the ducts are advantageously made of stainless steel. The filter units can be made of plastic or a metal material. Advantageously, the filter units are configured in the form of a wire-wound filter.

[0024] The watertight wall section of the duct is surrounded by a watertight material, wherein, in particular, a swelling material, for example swelling earth, is suitable for this. The watertight wall section of the duct, which is formed by the filter units, is surrounded by a water-permeable material, for example gravel.

[0025] According to a first variant of the application, the filter assembly has peripheral delivery pipes, that is to say delivery pipes which extend outside the duct which accommodates the filter units.

[0026] Here, the delivery pipes extend parallel to one another and parallel to the duct at a distance from one another. Advantageously, the peripheral delivery pipes form a rotationally symmetrical arrangement about the duct.

[0027] In this variant of the application, the chambers are advantageously separated in a watertight manner by a separating plate.

[0028] The separating plate is preferably made of stainless steel and extends over the entire cross section of the duct. Preferably, the separating plate is welded to the inner wall of the duct.

[0029] In the chambers separated by the separating plate, there is only one filter unit respectively. Expediently, the peripheral delivery pipes lead into the duct below the filter units respectively.

[0030] According to a second variant of the application, the filter assembly has a concentric arrangement of the delivery pipes which extend within the pipe, wherein these are arranged symmetrically with respect to a longitudinal axis, i.e. the axis of symmetry of the pipe.

[0031] Here, the concentric delivery pipes have their upper ends which pass out above the surface of the soil in which the shaft is to be produced.

[0032] In addition, the lower ends of the concentric delivery pipes are located at different height positions and are each assigned to a filter unit here.

[0033] Thus, each delivery pipe is assigned to a filter unit, wherein these individual filter units are in turn decoupled in a watertight manner. Advantageously, the exit openings of the lower ends of the delivery pipes are located immediately above the filter units.

[0034] According to an advantageous embodiment, the concentric delivery pipes are each supported in a centring insert which is fastened on the inner wall of the pipe.

[0035] Here, a sealing cone is provided on the outer wall of the delivery pipe which can be introduced into the central opening of the assigned centring insert.

[0036] Thus, the delivery pipes are easily assembled within the pipe by introducing them from above into the pipe and then into the opening of the assigned centring insert. Here, the sealing cone on the delivery pipe closes the opening in the centring insert and thus ensures an automatic position fixing of the delivery pipe without the need for additional work steps.

[0037] In addition, the centring insert forms a watertight separation element with the assigned sealing cone, wherein with this separation element the chamber with the filter units is separated in a watertight manner.

[0038] The filter assembly is assembled in such a way that first the pipe is positioned in the shaft. Here, the individual centring inserts on different gradients are fastened on the inner wall of the pipe as preassembled units.

[0039] In a first step, a delivery pipe with the smallest outer diameter is assembled in the pipe, wherein this is fixed on the lowermost centring insert with the sealing cone. In this region, the lower end of the first delivery pipe passes out.

[0040] Then, a second delivery tube is assembled, the outer diameter of which is larger than that of the first delivery tube. The second delivery tube surrounds the first delivery tube, wherein the sidewalls of these delivery tubes are spaced apart from each other. The second delivery tube is fixed to the second, lowest centering insert. In this region, the lower end of the second delivery tube extends out. Further delivery tubes are assembled in a corresponding manner, wherein typically the nth delivery tube surrounds the (n-1)th delivery tube, and the nth delivery tube is fixed to the nth centering insert, which is located above the (n-1)th centering insert. Attached Figure Description

[0041] The invention is described below with reference to the accompanying drawings. These drawings show:

[0042] Figure 1 Example of a first variation of the filter assembly according to the present invention.

[0043] Figure 2 Example of a second variation of the filter assembly according to the invention.

[0044] Figure 3a : according to Figure 2 The diagram shows a detailed view of the components, which have a centering insert on the delivery pipe and an associated sealing cone.

[0045] Figure 3b The sealing cone is fixed in the centering insert according to... Figure 3a Components. Detailed Implementation

[0046] Figure 1 An example of a first variation of the filter assembly 1 according to the invention is shown. The filter assembly is integrated in an underground well that is machined into the soil 2 and exits onto the surface of the soil 2. The filter assembly 1 is associated with a water pretreatment unit 3 arranged on the ground surface, which is typically used in multiple treatment stations 4 for pretreating groundwater present in the soil 2.

[0047] The filter assembly 1, arranged in the wellbore, has a cylindrical pipe 5 whose longitudinal axis extends in the vertical direction. The pipe 5 is advantageously made of stainless steel.

[0048] Multiple filter units 6 are arranged vertically and at intervals within the pipe 5. The filter units 6 can be made of plastic, steel, or other metal materials. In the present case, the filter unit 6 is constructed as a wire-wound filter. Physical treatment, such as an absorption process, is performed within the filter unit 6 to filter harmful substances.

[0049] like Figure 1 As shown, the outer side of the filter unit 6 forms the wall sections of the pipe 5. These wall sections are permeable to water. The other wall sections are impermeable to water.

[0050] The water-impermeable wall sections are surrounded by a water-impermeable material, in particular a swelling material, such as swelling clay.

[0051] In contrast, the water-permeable wall sections of the pipe 5, which are formed by the filter units 6, are surrounded by a water-permeable material, such as sand. Thereby, a water exchange between the filter units 6 and the soil area is possible, that is to say, groundwater can be supplied from the soil 2 to the filter units 6, or pre-treated water can be guided by the filter units into the soil area, wherein the flow direction of the water is related to the water pressure in the filter units 6. In Figure 1 An exemplary water circulation is indicated by arrows I, II.

[0052] The individual filter units 6 are arranged in chambers which are separated from one another in a water-tight manner. In order to construct these chambers, in the present case there are provided partition plates 7 made of stainless steel, which are welded to the inner wall of the pipe 5.

[0053] As Figure 1 is shown, the filter assembly 1 has an arrangement of delivery pipes 8 which extends peripherally, that is to say, outside the pipe 5. The longitudinal axes of the delivery pipes 8 extend parallel to one another and parallel to the longitudinal axis of the pipe 5. The delivery pipes 8 are arranged at a distance from one another and at a distance from the pipe 5, wherein the delivery pipes 8 form a rotationally symmetrical arrangement, in particular such that adjacent delivery pipes 8 are arranged at the same angle offset from one another.

[0054] The upper end of the delivery pipes 8 passes immediately above the surface of the soil 2. The lower end of the delivery pipes 8 passes into the pipe 5. Here, each delivery pipe 8 is assigned to a filter unit 6, respectively. Figure 1 As is shown, each delivery pipe 8 passes into the pipe 5 immediately below the assigned filter unit 6.

[0055] The pump 9 can be introduced into the delivery pipes 8 from above via the passage openings of the delivery pipes. Figure 1 An arrangement is shown in which the pump 9 is introduced into two of the delivery pipes 8. The pump 9 is held at a nominal position in the region of the assigned filter unit 6 in the lower portion of the delivery pipe 8. This nominal position can be defined by a deflection of the delivery pipe 8. Alternatively, holding means, such as a bridge, can be provided on the inner wall of the delivery pipe 8 in order to predefine the nominal position.

[0056] By introducing the pump 9 into the delivery pipes 8, a pump pipe is formed, by means of which water is pumped from the respective chamber with the filter unit 6 upwards and supplied to the water pre-treatment unit 3 in order to perform a treatment of the water there, in particular in the form of a chemical, physical or biological treatment.

[0057] Other delivery pipes 8 without pump 9 form a permeation pipe. Water is pumped from the water pretreatment unit 3 into the delivery pipe 8 and supplied to the associated filter unit 6 via a pump assembly on the ground.

[0058] Figure 1 An example of a second variation of the filter assembly 1 according to the invention is shown. This filter assembly 1 is used in conjunction with... Figure 1 The filter assembly 1 is integrated into the well in the soil 2 in the same manner and attached to the water pretreatment unit 3 on the ground.

[0059] according to Figure 1 The filter assembly 1 also includes a conduit 5, in which multiple filter units 6 are arranged vertically and horizontally at intervals. The filter units 6 further form permeable wall sections of the conduit 5, the permeable wall sections being surrounded on the lower side of the conduit 5 by a permeable material, such as gravel. The remaining wall sections of the conduit 5 are impermeable and correspondingly surrounded on the outer side of the conduit 5 by an impermeable material, such as bentonite.

[0060] According to Figure 2 In the filter assembly 1, a concentric arrangement of delivery pipes 8a-8c is provided inside the pipe 5, wherein the longitudinal axis of the delivery pipes coincides with the longitudinal axis of the pipe 5.

[0061] A single delivery pipe 8 is supported in a centering insert 10a-d, which is fastened to the inner wall of the pipe 5. In the present case, the centering inserts 10a-10d have the shape of a centering funnel.

[0062] Figure 3a and 3b A detailed view of the lowermost centering insert 10a is shown, which has an innermost delivery pipe 8 and a pump 9 supported in its lower region. (According to...) Figure 1 Similarly, the pump 9 can be introduced into the delivery pipe 8 from above and then positioned at a fixed location near the associated filter unit 6.

[0063] Such as especially by Figure 3a As shown, a central opening 11 is provided in the bottom region of the upwardly widening funnel of the centered insert.

[0064] Correspondingly, a sealing cone 12 is tightened on the outside of the delivery pipe 8a, the outer contour of which matches the edge contour of the opening 11. The sealing cone 12 has an O-ring 13 as a sealing element.

[0065] The delivery tube 8a is assembled by introducing the lower region of the delivery tube 8a into the opening 11 of the centring insert 10a until the sealing cone 12 rests on and is fixed in position on the edge region of the centring insert which delimits the opening 11. The sealing cone 12 sealingly closes the opening 11, in particular by means of the O-ring 13. The delivery tube 8 is made into a pump tube by the pump 9, by means of which the water is pumped from the lowermost filter unit 6 upwards to the water pre-treatment unit 3.

[0066] The further delivery tubes 8b-8c have corresponding sealing cones 12 and are mounted together with these sealing cones into the openings 11 of the associated centring inserts 10b-10d and are thus fixed in position.

[0067] As shown in Figure 2 the lowermost centring insert is located above the lowermost filter unit 6 and separates this lowermost filter unit from the other filter units 6 in a water-tight manner.

[0068] The second delivery tube 8b surrounds the first delivery tube 8c and is supported together with the sealing cone 12 in the second lowermost centring insert 10b. The lower end of the delivery tube 8b lies immediately above the second lowermost filter unit 6.

[0069] Between the lowermost centring insert 10a and the second lowermost centring insert 10b a water-tight chamber is formed in which only the second lowermost filter unit 6 is present. Water is supplied to this filter unit 6 by means of the second delivery tube 8b, into which the water is pumped from above.

[0070] The second uppermost filter unit 6 is located in a water-tight chamber between the centring insert 10b and the centring insert 10c in which the third delivery tube 8c is supported. This delivery tube 8c leads immediately above the second uppermost filter unit 6. A pump 9 is introduced into this delivery tube 8c, so that this delivery tube forms a pump tube with which water is pumped from this filter unit 6 upwards and supplied to the water pre-treatment unit 3.

[0071] Finally, the centring insert 10d forms a further water-tight chamber with the upper edge region of the duct 5, in which the uppermost filter unit 6 is supported. Water is supplied to this filter unit 6 from above.

[0072] The assembly of the filter assembly 1 according to Figure 2 is carried out in such a way that after the installation of the duct 5 in the shaft, first the delivery tube 8a is assembled, then the delivery tube 8b and finally the delivery tube 8c.

[0073] List of reference signs

[0074] (1) filter assembly

[0075] (2) Soil

[0076] (3) Water pre-treatment unit

[0077] (4) Treatment station

[0078] (5) Pipe

[0079] (6) Filter unit

[0080] (7) Partition

[0081] (8) Delivery pipe

[0082] (8a-c) Delivery pipe

[0083] (9) Pump

[0084] (10a-d) Centering insert

[0085] (11) Opening

[0086] (12) Sealing cone

[0087] (13) O-ring

[0088] I) Arrow

[0089] II) Arrow

Claims

1. A filter assembly (1) with a modular arrangement of filter units (6) arranged at a distance one above the other in a duct (5), wherein, The pipe (5) is arranged in a shaft in the ground, wherein the filter units (6) constitute water-permeable wall sections of the pipe (5), through which water exchange with the soil (2) surrounding the pipe (5) is possible, characterized in that a concentric arrangement of delivery pipes is provided within the pipe (5); or in that a peripheral delivery pipe is provided which extends outside the pipe (5), wherein the delivery pipe extends towards the surface of the soil (2) and has an opening (11) there, through which a pump (9) can be introduced, wherein the assembly of the pump (9) takes place in such a way that the pump (9) is introduced into the delivery pipe from above through the opening (11) of the delivery pipe and is lowered in the delivery pipe to the nominal position assigned to the filter unit (6).

2. The filter assembly (1) according to claim 1, characterized in that The delivery pipe into which the pump (9) is introduced is configured for the removal of water.

3. The filter assembly (1) according to claim 2, characterized in that The delivery pipe is configured for the introduction of water.

4. The filter assembly (1) according to any one of claims 1-3, characterized in that, The filter units (6) are arranged in chambers which are separated from one another in a watertight manner.

5. The filter assembly (1) according to claim 4, characterized in that A delivery pipe is assigned to each chamber.

6. The filter assembly (1) according to any one of claims 1-3, characterized in that, The longitudinal axis of the delivery pipe extends parallel to the longitudinal axis of the pipe (5).

7. The filter assembly (1) according to any one of claims 1-3, characterized in that, The filter units (6) are configured in the form of a wire-wound filter.

8. The filter assembly (1) according to claim 4, characterized in that The peripheral delivery pipe forms a rotationally symmetrical arrangement about the pipe.

9. The filter assembly (1) according to claim 4, characterized in that The peripheral delivery pipe each opens into the pipe (5) below the filter unit (6).

10. The filter assembly (1) according to claim 8 or 9, characterized in that The chambers are separated in a watertight manner by a partition (7).

11. The filter assembly (1) according to any one of claims 1-3, characterized in that The concentric delivery pipes each have their upper end which emerges above the surface of the soil (2) in which the shaft is machined.

12. The filter assembly (1) according to claim 11, characterized in that The lower end of the concentric delivery pipes is located at different height positions and is each assigned to a filter unit (6) here.

13. The filter assembly (1) according to claim 11, characterized in that The concentric delivery pipes are each supported in centring inserts (10a-d) which are fastened to the inner wall of the pipe (5).

14. The filter assembly (1) according to claim 13, characterized in that A sealing cone (12) is provided on the outer wall of the delivery pipe, which can be introduced into the central opening (11) of the assigned centring insert (10a-d).

15. The filter assembly (1) according to claim 14, characterized in that The centring insert (10a-d) and the assigned sealing cone (12) form a watertight separation element with which the chambers with filter units (6) are separated from one another in a watertight manner.

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