DE102016117242B4 - Apparatus and method for cleaning the inner surface of liquid-carrying pipes - Google Patents

Abstract

A device for cleaning the inner surface of liquid-carrying pipes, comprising at least a first rotational nozzle assembly (6) concentrically movable in the pipe and at least one second concentric rotation nozzle assembly (42) concentric with the pipe, each having radially directed nozzles (7a, 7b) moving in relative rotation with respect to the inner surface of the tube upon exit of a jet of water or solvent in a working section, wherein the first rotary nozzle assembly (6) is coupled to a rotary drive device, at least one second rotary nozzle assembly (42) with the first rotary nozzle assembly (6) - The second rotary nozzle assembly (42) with the first rotary nozzle assembly (6) is coupled via at least one device, - the second rotating nozzle assembly (42) with respect to the first rotary nozzle assembly (6) in terms of magnitude greater rotational speed in e in the first mode of operation is rotatable via the at least one means and, via the at least one means, the second rotating nozzle assembly (42) is movable in the same direction and at the same rotational speed as the first rotating nozzle assembly (6) in a second mode of operation when the amount the rotational speed of the second rotary nozzle assembly (42) is less than the amount of rotational speed of the first rotary nozzle assembly (6).

Description

The present invention relates to an apparatus and method for cleaning the inner surface of liquid-carrying pipes, such as well pipes in well shafts, having at least one first rotational nozzle assembly concentrically movable in the pipe and at least one second rotary nozzle assembly concentrically longitudinally movable in the pipe. The well shaft and the piercing openings present in the shaft wall as well as gravel layers immediately adjacent behind the shaft wall are cleaned by using a shelf which can be lowered into the well shaft and which has spaced-apart horizontal separating elements with sealing means for forming a working chamber in the well shaft.

From the prior art of DE 40 17 367 C2 such as DE 196 26 590 C2 It is known to clean the well shaft wall and the penetration openings and the gravel layers adjacent behind the shaft wall by means of a high-pressure liquid jet (water and / or cleaning liquid). In addition, aerated air may be added to this high-pressure liquid jet. A rotary nozzle assembly is attached to a retractable into the well shaft carriage and is centered therein held. To clean the well shaft, the device thus formed is slowly lowered into the well shaft or pulled when pulling from bottom to top.

In devices for cleaning well shafts by means of a rack, the cleaning liquid or the well water present therein is pressed under pressure into the adjacent gravel layers from a working chamber and flows into a spaced apart by separating elements and sealing elements suction chamber. The seal is carried out by so-called packer, which are acted upon by air or water, which are elastic and seal against the well shaft wall leaning.

DE 198 23 401 C1 discloses a device and a method for cleaning a well shaft, the existing in the shaft wall penetration openings and immediately behind the shaft wall gravel layers, using a lowerable in the well shaft rack, the spaced apart horizontal separating elements with sealing means for forming a working chamber in the well shaft with a rotating nozzle arrangement provided in the working chamber and having substantially radially extending nozzles which are at least briefly acted upon by water and / or a cleaning fluid under high pressure and having a suction pipe opening into the working chamber with a pumping device via which the latter is located in the working chamber located water and / or cleaning fluid at least during the pressurization of the nozzle or at least immediately after pressurizing be pumped.

DE 198 23 401 C1 further discloses that two or more rotary nozzle assemblies may be provided which may rotate in opposition to a first rotary nozzle assembly, wherein the rotational speed of the second or further counter rotating nozzle assemblies may also be controlled or regulated. The further rotary nozzle arrangements coupled to a second rotary nozzle arrangement can be coupled via a driving gear.

US 2014/0231546 A1 discloses an apparatus for cleaning the inner surface of liquid-carrying tubes having a body with a longitudinal axis and having a first group of nozzles and a second group of nozzles forming rotary nozzle assemblies, wherein the first group of nozzles and the second group of nozzles are spaced from one another are and the angle between the nozzles and the longitudinal axis is variable.

However, the devices known from the prior art have disadvantages. In particular, a driving gear only allows a rotation of two mutually coupled rotary nozzle assemblies with the same rotational speed.

When cleaning well shafts, for example, coarse-grained deposits are released. Furthermore, the water in the working chamber in the cleaning operations, at least at the beginning of a cleaning process, mixed with sludge. Overall, therefore, all components of such cleaning devices that are exposed to these influences must be protected from damage and designed accordingly.

Thus, devices that have sensitive control and components prone to failure (e.g., flywheel gears), interfere with and even fail at least one rotary nozzle assembly. As a result, worse cleaning results or even no cleaning is done.

Starting from the prior art, the present invention based on the object to provide an apparatus and a method for cleaning the inner surface of liquid-conducting pipes, wherein a simple embodiment of a Continued cleaning and the damage to the inner surface of liquid-carrying pipes is prevented, even if the speed of at least a second rotating nozzle assembly can not be maintained.

The object is achieved by a device having the features specified in claim 1 and by a method having the features specified in claim 13. Advantageous developments of the invention are specified in the dependent claims in detail.

• - ist die erste Rotationsdüsenanordnung mit einer Drehantriebsvorrichtung gekoppelt,
• - ist mit der ersten Rotationsdüsenanordnung mindestens eine weitere zweite Rotationsdüsenanordnung gekoppelt, wobei die zweite Rotationsdüsenanordnung mit der ersten Rotationsdüsenanordnung über mindestens eine Einrichtung gekoppelt ist,
• - ist die zweite Rotationsdüsenanordnung mit einer gegenüber der ersten Rotationsdüsenanordnung betragsmäßig größeren Rotationsgeschwindigkeit in einer ersten Betriebsart über die mindestens eine Einrichtung drehbar, und
• - ist über die mindestens eine Einrichtung die zweite Rotationsdüsenanordnung in der gleichen Richtung und mit der gleichen Rotationsgeschwindigkeit wie die erste Rotationsdüsenanordnung in einer zweiten Betriebsart bewegbar, wenn der Betrag der Rotationsgeschwindigkeit der zweiten Rotationsdüsenanordnung kleiner ist als der Betrag der Rotationsgeschwindigkeit der ersten Rotationsdüsenanordnung.

In a device according to the invention for cleaning the inner surface of liquid-carrying tubes, comprising at least a first concentric in the tube longitudinally movable rotary nozzle assembly and at least a second concentrically in the tube longitudinally movable rotary nozzle assembly, each having radially directed nozzles which rotate relative to the inner surface of the Moving the tube when a jet of water or solvent emerges in a working section,

• the first rotary nozzle arrangement is coupled to a rotary drive device,
• at least one further second rotary nozzle arrangement is coupled to the first rotary nozzle arrangement, wherein the second rotary nozzle arrangement is coupled to the first rotary nozzle arrangement via at least one device,
• the second rotary nozzle arrangement is rotatable via the at least one device in a first operating mode with a rotational speed which is greater in magnitude than the first rotary nozzle arrangement;
• the second rotary nozzle assembly is movable in the same direction and at the same rotational speed as the first rotary nozzle assembly in a second mode of operation via the at least one means when the amount of rotational speed of the second rotary nozzle assembly is less than the amount of rotational speed of the first rotary nozzle assembly.

In the apparatus, for example, the rotational speed of the first rotary nozzle assembly relative to the inner surface of the tube may be independent or dependent upon the pressure jet exiting the nozzles of the first rotary nozzle assembly. The rotary drive device preferably has a motor, in particular an electric motor. The rotational speed of the first rotary nozzle assembly may be controlled thereby. At a rotational speed dependent on the pressure jet of the nozzles, a drive is effected by the recoil principle.

The relative rotational speed of the second rotary nozzle assembly may also be independent or dependent on the pressure jet exiting the nozzles of the second rotary nozzle assembly. If the second rotary nozzle arrangement is, for example, driven by a separate motor, for example an electric motor, a second operating mode can, for example, then be set when the second rotary nozzle arrangement is blocked. The blockage does not necessarily lead to a blockage of the first rotating nozzle assembly. When the second rotary nozzle assembly is driven by the same motor as the first rotary nozzle assembly, for example via a reverse gear, blockage of the second rotary nozzle assembly will generally also block the first rotary nozzle assembly or damage the engine and / or the reverse gear. Preferably, the second rotary nozzle assembly is rotated recoil driven and therefore is not directly rotated by a motor in the first mode of rotation.

The first rotary nozzle arrangement and the second rotary nozzle arrangement can also rotate in opposite directions in other embodiments. The at least one device then causes, for example, a pressure reversal of a cleaning liquid which causes a rotation of the second rotation nozzle arrangement due to recoil, a reversal of motion of the second rotating nozzle assembly and causes co-rotation with the first rotating nozzle assembly. Such a device can be designed in various ways. In other implementations, such a device is a controllable coupling which, in the first mode of operation, permits counter rotation of the first and second rotary nozzle assemblies. Devices and means for counterrotating are known in the art. In one embodiment of the controllable coupling device described herein, detent means may rotate the second rotary nozzle assembly when, for example, a decrease in the amount of rotational speed of the second rotary nozzle assembly is detected via a rotational speed sensor for the second rotary nozzle assembly. A controller receives the information about the rotational speed of the second rotary nozzle assembly and compares this with the rotational speed of the first rotary nozzle assembly. The rotational speed or the amount of the rotational speed of the first rotary nozzle arrangement can be easily determined. For example. via a further rotational speed sensor and / or via a motor control for the first rotary nozzle arrangement. If the controller determines that the amount of rotational speed of the second rotary nozzle assembly is decreasing and less than the amount of rotational speed of the first one Rotary nozzle arrangement, activates this, for example via actuators, the locking means. The locking means may be, for example, controllable magnets in a controllable magnetic coupling or pins or bolts, which engage in corresponding receptacles. In order for the co-rotation of the second rotary nozzle arrangement to take place at all, special devices can be provided in further embodiments which, for example, press the second rotary nozzle arrangement against the first rotary nozzle arrangement. Also, braking devices are provided in further embodiments. A braking device can also realize a pressing or pressing. In still further embodiments, a braking device which, for example, presses the second rotary nozzle arrangement against the first rotary nozzle arrangement may be designed such that the pressure is so great that rotation of the second rotary nozzle arrangement with the first rotary nozzle arrangement takes place. To achieve "pressing" or "pressing", the first rotating nozzle assembly and the second rotating nozzle assembly may include clutch plates. The clutch discs may have on the surfaces facing each other a special surface coating or their surfaces are correspondingly formed so that in the pressed-together state, a high friction is achieved. Friction-increasing surfaces can also cause braking functions.

Since the first rotary nozzle arrangement is moved at a rotational speed which is lower than the second rotary nozzle arrangement, for example in the region of 60 revolutions per minute, the "coupling" of the second rotary nozzle arrangement with the first rotary nozzle arrangement is clearly easier to implement than if the amount of rotational speed of the first rotary nozzle arrangement would be in the range of several hundred or a thousand revolutions per minute. Therefore, locking pins or the like can be easily brought into appropriate receptacles. However, in order to achieve a dipping of locking in appropriate shots, they can be designed accordingly and, for example, have slopes.

Only devices are known from the prior art, which reveal an opposite rotation of nozzle assemblies, wherein a first nozzle assembly and a second nozzle assembly are rotated in the opposite direction and the second nozzle assembly further nozzle assemblies are coupled via a driving gear, in the same direction as the second nozzle arrangement, ie opposite to the direction of rotation of the first nozzle arrangement, are rotated.

However, a device which enables safe operation at, for example, differently driven rotary nozzle arrangements (motor / recoil) at different rotational speeds, even in the opposite direction of rotation, is not known from the prior art.

In still other embodiments, with co-rotating rotary nozzle assemblies, first rotary nozzle assembly, and second rotary nozzle assembly, co-rotation of the second rotary nozzle assembly may be accomplished simply by, for example, an overrunning clutch that allows the second rotary nozzle assembly to "overhaul" the first rotary nozzle assembly. However, if the rotational speed of the second rotary nozzle assembly fails, teeth having run-off slopes coupled to the second rotary nozzle assembly may be carried along via corresponding rectilinear tooth portions coupled to the first rotary nozzle assembly and provide a "lock." The overrunning clutch therefore allows overtaking, but prevents a stoppage of the second rotating nozzle assembly.

As already stated above, the rotational speed or the amount of the rotational speed of the first rotary nozzle arrangement can be, for example, 1 revolution per second (or 60 rpm), the rotational speed or the rotational speed of the second rotational nozzle arrangement being dependent on the pressure of the first rotational nozzle assembly Water or the cleaning liquid in the range of 60 to 1000 revolutions per minute (60 - 1000 rpm) can be. For example, the first rotary nozzle arrangement is operated in accordance with the first rotational speed via an electric motor, which is coupled to the first rotary nozzle arrangement via further means. The first rotation speed is detected by a rotary encoder, also called rotary encoder. The rotary pulse generator is preferably arranged in the region of the first rotary nozzle arrangement. This prevents, for example, a rotation is detected, although the first rotating nozzle assembly does not rotate when the rotary encoder would be located in the immediate vicinity of the electric motor. As a result of the arrangement in the region of the first rotary nozzle arrangement, it is thus also possible to detect errors in a gear arranged between the first rotary nozzle arrangement and the electric motor. Instead of an angular encoder, other means for detecting a rotation may be provided. In addition to determining the presence of rotation, the speed can also be determined in a simple manner. Opposite the rotational speed of the first rotating nozzle assembly In the above-mentioned embodiments, the rotational speed of the second rotating nozzle assembly is dependent on the pressure of the water or the cleaning liquid. The second rotating nozzle assembly is thereby moved by the recoil of the exiting water or cleaning agent. The two different rotational speeds of the first rotating nozzle assembly and the second rotating nozzle assembly, and in other embodiments, the different rotational direction, allow for improved cleaning over known devices, for example, have two rotating nozzle assemblies with high rotational speeds, since by the first rotating nozzle assembly in the inventive device hard deposits of the Liquid-conducting tubes are dissolved and the water or the cleaning liquid can also act through filter slots in the filter gravel arranged behind it and pressure waves in a wider frequency range (for example 10000 Hz) are generated via the second rotating nozzle assembly. The device according to the invention minimizes settlement effects of the gravel fill by means of the two rotary nozzle arrangements with the corresponding rotational speeds. Settling effects occur particularly in prior art devices having one or two very fast rotating nozzle assemblies.

If, however, the case that the pressure of the water or the cleaning liquid drops, so that, for example, would result in a standstill or a significantly reduced rotational speed of the second rotating nozzle assembly, wherein the amount of rotational speed of the second rotating nozzle assembly is smaller than the amount the rotational speed of the first rotary nozzle assembly, the second rotary nozzle assembly is operated via the at least one device at the rotational speed of the first rotary nozzle assembly. In this case, there is no standstill of the second rotating nozzle assembly, which prevents damage to the pipe inner surface. While, as described above, the direction of rotation of the second rotating nozzle assembly can be reversed, i. both the first rotary nozzle arrangement and the second rotary nozzle arrangement have the same direction of rotation, but this ensures that no water or liquid jet acts on a specific point of the pipe inner surface over a relatively long period of time. In the apparatus according to the invention, an angular momentum generator can also be arranged in the region of the second rotation nozzle arrangement, via which the rotation speed of the second rotation nozzle arrangement is detected.

If the magnitude of the rotational speed of the second rotary nozzle arrangement falls below the magnitude of the rotational speed of the first rotary nozzle arrangement, then the rotational speed of both rotary nozzle arrangements can be determined via a rotary encoder arranged in the region of the first rotary nozzle arrangement, even if no rotary encoder or the like is provided in the region of the second rotary nozzle arrangement Device is arranged.

A rotary encoder in the region of the second rotary nozzle assembly may also be provided to check whether the at least one means for moving the second rotary nozzle assembly at the first rotational speed when the amount of rotational speed of the second rotary nozzle assembly is smaller than the amount of rotational speed of the first rotary nozzle assembly, works properly or is damaged.

Further, the first and second rotary nozzle assemblies may be movable up or down within a working section, the working section being formed by a working chamber. In further embodiments, the working chamber during the cleaning of a working section is movable up and down (oscillating cleaning).

In a further embodiment, a suction device can open into the working chamber, via which contaminated water can be pumped off during a cleaning cycle.

In this case, the working chamber can be displaced by removing a pressure from limiting separating elements in height. Thus, via the control of the pressure within a working chamber and the method of the rotary nozzle arrangements is controllable.

In further embodiments, the at least one device is a freewheel device. In this case, the freewheel device can be an overrunning clutch in further embodiments. A one-way clutch provides in a simple way the possibility that the second rotating nozzle assembly can be operated by pressure of the water or the cleaning liquid regardless of the rotational speed of the first rotating nozzle assembly, as long as the amount of rotational speed of the second rotary nozzle assembly is greater than the amount of rotational speed of the first rotating nozzle arrangement.

As indicated above, the at least one device may be a controllable clutch having opposite rotation allows the second rotary nozzle assembly to the first rotary nozzle assembly in the first mode and in the second mode via locking means co-rotation of the second rotary nozzle assembly with the first rotary nozzle assembly provides.

Furthermore, in further embodiments, the controllable clutch may be coupled with at least one rotational speed detection device and an actuator for coupling the first rotational nozzle arrangement with the second rotational nozzle arrangement via the locking means.

In this case, in still further embodiments, the controllable clutch have a braking device.

The controllable coupling or the at least one device make it possible to rotate the second rotary nozzle arrangement counter to the direction of rotation of the first rotary nozzle arrangement. However, if the amount of rotational speed of the second rotary nozzle assembly is less than the amount of rotational speed of the first rotary nozzle assembly, the controllable coupling causes co-rotation of the second rotary nozzle assembly in the corresponding rotational direction and rotational speed of the first rotary nozzle assembly. This prevents the second rotating nozzle assembly from going to a standstill or a low rotational speed state, which could damage the inner surface of the tubes. The controllable coupling is for this purpose coupled to a control and locking means for coupling the second rotary nozzle arrangement with the first rotary nozzle arrangement or has such components.

The first and / or the second rotary nozzle arrangement may further be arranged in further embodiments on a longitudinally movable transport device and / or in the center of a separating element in a pipe feed line.

The mechanical high-pressure cleaning in the working chamber, combined with the simultaneous or staggered extraction of the liquid from the working chamber, or carried out at intervals suction and / or pressurization, allows a controlled mechanical well cleaning. The liquid discharged from the working chamber can then be analyzed in a measuring section so that the cleaning process is controlled as a function of the turbidity, the sand content, the flow rate and / or the chemical and physical variables.

The high-pressure jet penetrates the slits of a well pipe, through which the well water flows into the well during normal operation of the well and also penetrates partial areas of the underlying gravel layers and causes the pebbles to vibrate. These vibrations cause the deposits to detach and flow into the working chamber with the well water through the adjacent slots. From this, the liquid or the contaminated well water is removed. In the mechanical cleaning process by means of a high-pressure jet so the inside of a shaft wall, for example, a well pipe is cleaned and on the other hand, the incrustations at Durchdringungsöffnungen, the slots of the pipe wall, blasted and dissolved the deposits of the individual pebbles and with the incoming well water in transported the same working chamber and discharged from here. The device (and corresponding method) are suitable for use in deep wells of different sizes (diameter and depth).

In this case, smaller racks with two separators can be used to form a single chamber. As a pump, an underwater pump can be used directly in the working chamber. But there are also other and distributed pump systems possible to suck the liquid from the working chamber. The device can also be used in areas of the well shaft, in which there is no well water. In this case, the water or the liquid emerging through the high-pressure nozzles flows through the adjacent slots of the well shaft wall back into the working chamber, so that this liquid can also be pumped out and analyzed. Depending on the analysis values, on the one hand the duration of the cleaning process and on the other hand also the pump can be controlled.

The pump, but also the pressurization of the rotary nozzles can also be influenced by a control function of the measured pressure in the working chamber. In the event that the first and second rotary nozzle arrangement are arranged so that in the longitudinal direction of a method about the height of the working chamber is possible, it is moreover ensured that ensures efficient cleaning of the well shaft wall and the subsequent gravel layers over the entire section is. If the pumped out water has no turbidity, the cleaning process can be ended.

Furthermore, a centering of the first and the second rotary nozzle arrangement can be carried out in a simple manner, wherein these are mounted via corresponding shafts or sleeves in at least one of the two separating elements, which extends through Centrally align inflatable or water-filled packers.

The use of a pressure sensor and a pressure-dependent control of the pump also ensures pump protection against dry running. Only when appropriate pressure is measured, i. given a certain amount of water for pumping, the pump is turned on. Thus, if the rack is located in a section of the deep well that does not yet have well water, the pump will not be turned on until the pressure sensor in the working chamber itself detects sufficient pressure to indicate that sufficient water is available can be pumped out. On the other hand, the pump can be shut down immediately when a minimum pressure in the chamber is no longer present.

In further embodiments, at least one further rotary nozzle arrangement is coupled to the first and / or second rotary nozzle arrangement via at least one further device, so that the at least one further rotary nozzle arrangement and the second rotary nozzle arrangement are moved with the first rotary nozzle arrangement if the magnitude of the rotational speed of the at least one further Rotary nozzle assembly and / or the amount of rotational speed of the second rotary nozzle assembly is less than the amount of rotational speed of the first rotary nozzle assembly and / or the amount of rotational speed of the at least one further rotary nozzle assembly is less than the amount of rotational speed of the second rotary nozzle assembly. The at least one further device can here again be designed as an overrunning clutch or as a controllable clutch. Accordingly, in such embodiments of the present invention, with a plurality of rotating nozzle assemblies, it can always be ensured that at least all the rotating nozzle assemblies rotate at a certain speed.

Thus, the directions of rotation of the individual rotating nozzle arrangements can also be alternately aligned, but as the amount of rotational speed of the second rotating nozzle arrangement and of further rotating nozzle arrangements fall, they are operated in the same direction of rotation as the first rotating nozzle arrangement.

The separating elements may be packers which can be filled with a gas or a liquid, consist of an elastic foam or be a composite of a plurality of packers and / or separating elements, wherein the separating elements may in turn be so-called fillable or foam-type packers. The packers may also be substantially disk-shaped and have a lower height than, for example, packers that can be filled with a liquid or gas. Fillable packers can be filled with a gas or liquid to seal a working section from the space below and above. By filling the seal may vary, so that always a matched to the corresponding section to be cleaned seal is achieved. The degree of filling can be changed during a cleaning process and when lowering the device or when pulling up. These packers serve to seal off the working section from the space above and below. The separating elements can be designed to be flexible, with a flexible design serving to further improve the sealing. In addition, the height of the dividing elements (e.g., packer) can significantly influence the seal since a larger area of the dividing elements is provided, for example, against the well wall of a well. If the separating elements consist of a multiplicity of relatively thin, disk-shaped separating elements, a good sealing can likewise be achieved if the individual separating elements of the composite have chambers at the edge regions and between the separating elements.

A sealing of the working section via an upper separating element to the space located above can take place in the region of a sleeve, pipe or shaft extending through the upper separating element, for example via a so-called labyrinth seal. However, other seals can be used for this purpose.

A working chamber consisting of at least two separating elements, between which the first and the second rotating nozzle arrangement are arranged, is moved, for example, at a speed of 1 to 2 cm per second for cleaning a well. Furthermore, an oscillating movement can take place such that the first and the second rotating nozzle arrangement (entire cleaning device) are moved up and down by 1 to 3 meters during a cleaning process. The working portion of a working chamber formed between two partitions typically has a height of 1 to 2 meters, i. the distance of an upper separator from a lower separator is 1 to 2 meters.

The present invention also allows operation with a relatively low power consumption compared to prior art devices. These work normally with a throughput (of water or a cleaning liquid) from 90 to 150 liters per minute. This results in very high pressure jets from the nozzles, which on the one hand can damage a filter wall (of the well) and on the other hand cause settlement effects and destruction of the gravel. A device according to the invention, however, has a throughput of up to 90 liters per minute. A device according to the invention therefore has, for example, a power consumption of 30 to 35 kW, with a corresponding device of the prior art having a power consumption of more than 90 kW due to the higher throughput.

The object stated at the outset is also achieved by a method for cleaning the inner surface of liquid-carrying pipes with a device according to one of the variants described above, wherein in a tube at least one first concentric in the tube longitudinally movable first rotary nozzle assembly and at least a second concentrically in the tube longitudinally movable rotary nozzle assembly are arranged, each having radially directed nozzles which move in relative rotation with respect to the inner surface of the tube at the outlet of a water or solvent jet in a working portion, wherein the second rotary nozzle assembly is coupled to the first rotary nozzle assembly via at least one device, and the second rotating nozzle assembly is rotated in the same direction and at the same rotational speed as the amount of rotational speed of the second rotating nozzle assembly becomes smaller than the second rotational nozzle assembly s is the amount of rotational speed of the first rotary nozzle assembly.

The first rotary nozzle assembly may be coupled to a rotary drive device and the relative rotational speed of the first rotary nozzle assembly relative to the inner surface of the tube may be independent or dependent on the pressure jet exiting the nozzles from the first rotary nozzle assembly. Further, the relative rotational speed of the second rotary nozzle assembly may be dependent upon the pressure jet exiting the nozzles of the second rotary nozzle assembly.

In the method for cleaning the inner surface of liquid-carrying pipes, the same advantages result as already described with respect to the device according to the invention.

The invention will be described in the following with reference to the embodiments illustrated in the figures. These have exemplary character and are therefore not to be understood as limiting.

• 1 eine schematische Darstellung einer Reinigungsvorrichtung mit zwei Rotationsdüsenanordnungen in einem Brunnenschacht mit quer verlaufenden Filterschlitzen;
• 2 einen Ausschnitt aus einem Tiefbrunnen mit einer Rotationsdüse;
• 3 ein schematisches Flussdiagramm für einen Reinigungsvorgang; und
• 4 ein Diagramm zur Darstellung eines beispielhaften Reinigungsverlaufs.

In the drawings shows:

• 1 a schematic representation of a cleaning device with two rotating nozzle assemblies in a well shaft with transverse filter slots;
• 2 a section of a deep well with a rotary nozzle;
• 3 a schematic flow diagram for a cleaning process; and
• 4 a diagram illustrating an exemplary cleaning process.

In 1 is shown schematically a section of a deep well. The shaft wall 1 consists of a well pipe, in which penetrating openings 2 , For example, horizontally extending slots or vertical slots of a certain length are introduced. Through these openings 2 that flows in the soil 5 Water located in the well shaft 3 one. From this it is pumped out under normal operating conditions and fed to the water supply network.

Behind the well shaft wall 1 is an artificial or natural gravel layer 4 introduced, which can follow more gravel and filter layers. By that in the well shaft 3 Inflowing water is formed by deposits in the gravel layers a filter skin, which must be removed by cleaning in order to keep the well as much as possible. This cleaning takes place through the penetration openings 2 the shaft wall 1 , For example. A filter tube of a well shaft 3 , through, by means of a penetrating high-pressure jet. In addition, deposits on the insides of the penetration openings 2 and at their edges, for example, crystalline deposits with prolonged service life of the well can not be excluded. The purpose of the cleaning is therefore also to ensure that such incrustations, which include the inner wall of the shaft wall 1 can cover the filter tube closed, can be mitbeeitigt. For this purpose, a first rotary nozzle arrangement 6 and a second rotary nozzle assembly 42 provided, wherein on the first rotary nozzle assembly 6 and the second rotary nozzle assembly 42 at least two radially extending 180 degrees offset nozzle arms 8a . 8b attached to which high-pressure nozzles 7a . 7b are coupled or screwed. The second rotary nozzle assembly 42 has corresponding nozzles, these in 1 are not designated. These nozzles 7a . 7b can be radially displaceable and adjustable on the nozzle arms 8a . 8b be stored like this over the arrow 29 is indicated. Accordingly, the nozzles are on the nozzle arms of the second rotary nozzle assembly 42 radially displaceable and adjustable, as indicated by arrow 35 is shown. It is therefore possible, the distance between the nozzle outlet openings and the shaft wall 1 of well shaft 3 to adjust or regulate depending on the pressure of the jet, wherein the adjustments are always made so that the distance does not fall below a minimum distance.

The high pressure nozzles 7a . 7b can be simple nozzles or so-called rotary nozzles, which automatically deflect the pump beam according to predetermined lines. These may be circular paths or else by curve curves of the deflection within the rotation nozzle assembly certain curved paths, eg up and down movements in an oval shape describe. It is also possible, the nozzle arms 8a . 8b through other nozzles or nozzle arms 8a . 8b different lengths to exchange. The nozzles 7a . 7b flow into the well shaft 3 at a certain distance, eg about 30 millimeters to about 100 millimeters, in front of the shaft wall 1 , so that a targeted high-pressure jet on the inner surface of the shaft wall 1 meets, and a clamping against a deposition tuber is largely avoided. For an automatic tracking of the nozzles 8a . 8b in the radial direction, even with larger deposit tubers by radial displacement in the direction of the first rotary nozzle assembly 6 and the second rotary nozzle assembly 42 a striking can be avoided.

The supply of the rinsing liquid, for example water or cleaning liquid, which may be mixed with chemical or gaseous cleaning agents, via a supply line 9 located in the manifold within the first rotary nozzle assembly 6 and the second rotary nozzle assembly 42 is arranged. The supply line 9 is rigid with a feed tube 10 connected, in a guide sleeve 11 , which are twist-proof in a separating element 20 is arranged centrally, is rotatably mounted. The feed pipe 10 has a pinion at the top 12 on which a drive chain is placed, that of a motor pinion 13 an engine 14 is driven. This engine 14 is an electric motor and on the guide sleeve 11 attached so that the rotational movement over the motor pinion 13 and the invisible chain drawn on the pinion 12 and thus on the supply pipe 10 is transmitted. The feed pipe 10 is still on a rotary crossing 15 with a high pressure hose 16 coupled, via which the cleaning or rinsing liquid in the nozzle 7a . 7b is supplied. The motor 14 is from a control or regulation device in a control unit 25 driven. The speed of the engine 14 is variably adjustable, so that it is completely independent of the pressure from the nozzles 7a . 7b the speed for the first rotary nozzle assembly 6 can be set, and thus the relative rotational speed of the first rotary nozzle assembly 6 opposite the inner wall of the well shaft 3 ,

By not shown sensors, the pressure in the immediate outlet region of the nozzle 7a . 7b be measured. This is also inside the nozzles 7a . 7b possible. These pressure sensors generate an electrical signal, which is used as a manipulated variable of the control device in the control unit 25 of the motor 14 can be fed. Thus it is possible to increase the speed of the motor 14 depending on the actual discharge pressure of the water jet or the cleaning jet to control. As a result, the given pressure losses through long high-pressure hoses 16 For example, in deep wells of about 100 meters or 500 meters compensated and a higher cleaning effect, eg by slowing down the speed at a certain cleaning pressure of the water or cleaning jet, achieved. To control the speed, it is further required that a speed detecting device in the immediate vicinity of the rotating first rotating nozzle assembly 6 is attached to the actual speed of the first rotary nozzle assembly 6 to investigate. A speed detection device may also be a so-called rotary encoder or rotary encoder, which both the determination of the rotational speed of the first rotating nozzle assembly 6 allows as well as to determine the rotation of the first rotary nozzle assembly 6 serves. Such a device for detecting the rotation and the rotational speed of the first rotating nozzle assembly 6 is not mandatory, but advantageous due to the detection and detection of rotational speeds.

Alternatively, instead of the motor-driven, independent from the outlet jet pressure rotation, also be provided by the jet pressure-dependent rotation without a motor. The detected by means of a magnetic tachometer speed-dependent pulses are also the control unit 25 supplied and compared there in a control circuit with target specification. Deviations cause an activation of the engine 14 To increase or decrease its speed, depending on the direction of deviation of the determining speed of the target specification. The detection of the rotational speed of the first rotary nozzle arrangement 6 At the same time, it can also be used to control or regulate the jet pressure, for which purpose a switchable valve is used in the exemplary embodiment 26 symbolically in the high-pressure hose 16 is drawn. Instead of such a switchable valve 26 but can also be the pressure generating device, such as a high-pressure pump off and switched on. This additional measure to protect the shaft wall 1 against destruction of the high-pressure jet has the advantage that, for example, at a fraction of the feed tube 10 immediately the pressurization can be interrupted. Also should be a print interruption, if one of the two nozzles 7a and 7b (other nozzles may also be provided in pairs) on a deposition tuber within the well shaft 3 hits and blocks the rotation. However, the additional control option also offers the advantage that the first and second rotating nozzle arrangements 6 . 42 Only then be treated with cleaning liquid when the first rotary nozzle assembly 6 already turns at a minimum speed, so that even during the start-up phase of the cleaning process, a destruction of the shaft wall 1 is avoided.

The guide sleeve 11 is in the separator 20 Centrally mounted the frame. The details of the separator 20 or the structure of the frame are not shown. On the separator 20 is annular a sealing element 21 applied in the form of a pressurized medium hose or a packer. When lowering the frame into the well shaft 3 and after placement, the packers are inflated with air or water to form the work area and sealingly attach themselves to the shaft wall 1 at. The separating element 20 as well as the separating element 18 or the sealing elements 19 and 21 However, they can also consist of an elastic foam or of a composite of, for example, disc-shaped separating elements. In further embodiments, the separating elements form 18 and 20 with their respective sealing elements 19 and 21 one unit each.

In the separator 20 is also a suction tube 17 provided in the working chamber 38 empties. Into the suction pipe 17 is an underwater pump 40 used, the contaminated cleaning fluid or the water or mixture of the aforementioned liquids and the dissolved deposits and solids from the working chamber 38 during the cleaning process. The contaminated liquid is passed through a pipeline 24 from the well shaft 3 led out and, among other things, a measuring section 27 supplied in the measurement parameters, such as turbidity, sand content, flow rate and chemical and physical variables are determined in response to and depending on the means of the pressure sensor 37 determined working pressure in the working chamber 38 also to control the pumping. But this is also for example via the control unit 25 These sizes are also supplied or manually possible while monitoring the turbidity of the pumped well fluid.

The first rotary nozzle arrangement 6 is via a controllable clutch 54 with the second rotating nozzle assembly 42 coupled. The controllable clutch 54 is between the first rotating nozzle assembly 6 and the second rotating nozzle assembly 42 arranged. The controllable clutch 54 is formed so that the second rotating nozzle assembly 42 in a first mode opposite to the direction of rotation of the first rotary nozzle assembly 6 can rotate at a rotational speed whose amount is greater than the amount of rotational speed of the first rotating nozzle assembly 6 , However, if the amount of rotational speed of the second rotating nozzle assembly falls 42 below the amount of rotational speed of the first rotary nozzle assembly 6 , grip elements of locking means of the controllable coupling 54 in corresponding recesses, whereby the second rotating nozzle assembly 42 at the same rotational speed as the first rotating nozzle assembly 6 and in the same direction of rotation as the first rotary nozzle assembly 6 is turned.

The controllable clutch 54 and the locking means are controlled by a controller, not shown. In addition, the controller receives information about the amount of rotational speed of the first rotary nozzle assembly 6 and the second rotary nozzle assembly 42 , If, in a comparison of the two rotational speeds, it is determined that the rotational speed of the second rotary nozzle arrangement 42 amount is smaller than the rotational speed of the first rotary nozzle assembly 6 , the locking means are activated and cause a co-rotation of the second rotating nozzle assembly 42 with the first rotating nozzle assembly 6 ,

The locking means may also be clutch plates, which are for coupling the first rotary nozzle assembly 6 with the second rotating nozzle assembly 42 pressed together. For this purpose, a device is arranged, which performs the pressing of the two clutch plates upon receipt of a control signal from the controller.

The first rotary nozzle arrangement 6 gets regular over the engine 14 driven, wherein a fixed speed is adjustable. The second rotary nozzle assembly 42 is controlled by the pressure of the water or the cleaning liquid. For this purpose, the first rotary nozzle arrangement 6 a speed in the range of about 60 revolutions per minute, which is about controlling the rotational speed of the second rotating nozzle assembly 42 set speeds in the range of 60 to 1000 revolutions per minute by means of the pressure of the water or the cleaning fluid. The second rotary nozzle assembly 42 and the controllable clutch 54 are designed so that in normal operation - first mode - (amount rotation speed first rotation nozzle assembly 6 <Amount of rotational speed second rotary nozzle arrangement 42 ) is the second rotary nozzle assembly 42 in the opposite direction of rotation to the first rotating nozzle assembly 6 rotates. However, the pressure of the water or the Cleaning fluid for driving the second rotating nozzle assembly 42 serves, or other reasons occur, which is the rotational speed of the second rotating nozzle assembly 42 reduce so far that the amount of rotational speed of the second rotary nozzle assembly 42 is less than the amount of rotational speed of the first rotary nozzle assembly 6 , so will about the controllable clutch 54 a co-rotation of the second rotary nozzle assembly 42 in the same direction of rotation as the first rotary nozzle assembly 6 and at the same rotational speed as the first rotary nozzle assembly 6 reached (second mode).

In this case, it is ensured in a simple manner that the second rotary nozzle arrangement 42 does not stop and the exiting pressure jet from the nozzles of the second rotary nozzle assembly 42 the shaft wall 1 of the well shaft 3 can not damage.

The working chamber 38 goes down through another separator 18 completed by a sealing element 19 is surrounded, which can also be a so-called packer or hose and - as previously with the Packers 21 described - with the pressure medium water or air can be acted upon to achieve the desired seal. In the separator 18 is also a warehouse 23 provided, in which an extension 22 the nozzle head of the second rotary nozzle assembly 42 is rotatably mounted. This arrangement is not absolutely necessary, but can also be used as a frame connector with. The remaining parts of the frame are not shown and named for the sake of simplicity. The sealing elements 21 and 19 cause not only a seal, but also a centering of the frame in the well shaft 3 , It is also possible, the first rotary nozzle assembly 6 with appropriate storage and appropriate drive, for example, with the engine 14 can be coupled, also in Axialerrichtung gem. the arrow 28 to move up and down as it rotates, so that the entire working area is swept by the beam within the working chamber. The same applies to the second rotary nozzle arrangement 42 ,

The exiting pressure jet 31 causes a bursting of incrustations on the shaft wall 1 and the penetration holes 2 and a movement of the underlying gravel layers 4 , As well as a swinging movement of the individual pebbles, so that their deposits are flushed out. Through the adjacent penetration openings 2 in the shaft wall 1 the liquid enriched with sediments flows together with existing well water into the working chamber 38 and is then pumped out.

For cleaning, a second, z. B. below the separator 18 , attached suction chamber not necessary. The first rotary nozzle arrangement 6 in this case causes a cleaning of the shaft wall 1 primarily by the impinging pressure jet and the second rotating nozzle assembly 42 also causes a cleaning of the shaft wall 1 or the underlying gravel layers 4 , by a so-called pressure wave pulse method. Due to the higher speed of the second rotary nozzle assembly 42 opposite the first rotating nozzle assembly 6 on the one hand an increased and more uniform surface cleaning performance (for example, because the water jet is torn) as well as a cleaning by the pressure waves due to the high frequencies (for example, up to 10000 Hz).

However, reduces the rotational speed of the second rotating nozzle assembly 42 and the amount of rotational speed of the second rotary nozzle assembly 42 becomes smaller than the amount of the rotational speed of the first rotating nozzle assembly 6 , so does the controllable clutch 54 a reversal of the direction of rotation of the second rotating nozzle assembly 42, wherein the second rotating nozzle assembly 42 is moved at the same speed and in the same direction of rotation, as the first rotating nozzle assembly 6 , That is, as long as the first rotary nozzle assembly 6 , for example by means of the engine 14 When moving, both rotary nozzle assemblies rotate 6 and 42 ,

In 2 is a schematic representation of a partial section of a shaft wall 1 represented a fountain. This shaft wall 1 has penetration holes 2 which may also be formed as horizontal slots through which the water can flow into the well. In the embodiment is a rotary nozzle 7a the first rotary nozzle assembly 6 shown schematically, in which the cleaning fluid 30 entered at high pressure and through the outlet opening 34 as a spot beam 31 is issued.

In a corresponding manner, this applies to the first rotary nozzle arrangement 6 As well said for the second rotary nozzle arrangement 42 , wherein during operation of the device in which the first rotary nozzle arrangement 6 and the second rotary nozzle assembly 42 rotate in opposite directions, for the second rotating nozzle assembly 42 a direction of rotation opposite to the arrow 33 results.

The formation of the rotating nozzle describes the spot beam 31 by the arrow 32 given circular path of a cone. This happens in response to the pressure built up extremely fast, so that at standstill of the first rotary nozzle assembly 6 the beam of atomiser 7a at least one surface of the shaft wall 1 with at least two openings 2 overrun on the circular path, causing damage to the shaft wall 1 The fountain is also avoided, as the point beam 31 not constantly directed to the same place. The illustration also shows that even in the case of columns attached to the inner wall of the shaft wall 1 can be present, they can be easily crossed by the beam.

Are both the first and the second rotary nozzle assembly 6 and 42 at a standstill and will continue to be water or a cleaning fluid 30 under high pressure from the high pressure nozzle 7a delivered, this embodiment also prevents damage to the shaft wall 1 , When the high pressure nozzle 7a stands still, so only the spot beam 31 coming out of the outlet 34 the rotating nozzle emerges in rotation, the specified circular path along the arrow 32 depart. But since at the same time a rotation of the first and the second rotary nozzle assembly 6 and 42 - With at least two opposing nozzles - about a central axis along the arrow 28 , ie around the center axis of the tube, takes place - it can be seen that the spot beam 31 a relatively large area that extends over a larger partial area and thus multiple penetration openings 2 blows up, sweeps over without the impact pressure of the spot beam 31 This would be mitigated in contrast to the surface nozzle. The pressure force is thus fully used for mechanical cleaning, at the same time several slats - depending on the configuration of the steering angle of the rotary nozzle and the distance - are painted over, so that it is always ensured that the cleaning of the spot beam not only on, for example, a penetration opening 2 And gutter takes place, but that also the space between several Durchdringungsöffnungen 2 In any case, is also included, so that with continuous feed in the Z-axis direction of the device within the tube and a uniform cleaning of the surfaces and the penetration openings is ensured.

In a device for cleaning the inner surface of liquid-carrying pipes can be made directly on the position of the pump, a statement about the position of the cleaned work section. The raising and lowering of the device can be done via a winch. This can be done numerically controlled by an appropriate control. For example, an oscillating movement of 1 to 2 meters is made via the control. After a certain period of time or after the availability of a certain measurement result, the working section can then be relocated (as a rule, cleaning takes place from bottom to top). The control is designed so that in particular but not exclusively in the oscillating movement two superimposed lying to be cleaned working sections are overlapped cleaned or regenerated. That is, an upper part of a cleaned working section is also cleaned during the cleaning or regeneration of the overlying working section.

During regeneration, the mixture is always pumped out and checked at regular intervals. A review can also be done continuously. At the same time, a visual inspection can be carried out via a window in a part of a system connected to the device.

3 shows a schematic flow diagram for a cleaning process. At 301, the cleaning process begins, the apparatus comprising at least a first rotary nozzle assembly 6 , a second rotating nozzle assembly 42 , a separator 18 and a separator 20 and associated components, then positioned at 302 to a work section to be cleaned. Is the device with respect to a section to be cleaned within a well shaft 3 has been positioned, a sealing device is activated. For example. become sealing elements 19 and 21 attached to the dividing elements 18 and 20 are arranged, filled with a gas or liquid until the sealing elements 19 and 21 on a shaft wall 1 of the well shaft 3 abutting seal, with one between the separating elements 18 and 20 as well as the sealing elements 19 and 21 formed working chamber 38 in which the first rotary nozzle arrangement 6 and the second rotary nozzle assembly 42 are arranged, opposite the remaining well shaft 3 is sealed.

Alternatively, during cleaning, the apparatus for cleaning a working section may be continuously moved up and down by a certain amount to provide oscillating motion. The dimension around which the device up and down within the well shaft 3 is moved, for example, can be 1 to 2 meters. With such an oscillating cleaning, the sealing elements become 19 and 21 filled only to a certain extent, so that a movement is not hindered by this. Furthermore, the sealing elements 19 and 21 be designed to be elastic, the sealing elements 21 made of a plastic or filled with a foam.

After positioning or during the up and down movement of the device, the first rotating nozzle assembly 6 about a motor 14 powered and water and / or one Cleaning fluid via the high-pressure nozzles 7a and 7b for cleaning the well shaft 3 brought in. Further, the second rotating nozzle assembly 42 Water and / or a cleaning fluid for cleaning the well shaft 3 supplied, wherein the second rotary nozzle assembly 42 by the recoil of the water or the cleaning liquid rotates. The cleaning process and the configuration of the device essentially correspond to the already to the 1 and 2 Described, so that reference is made. The same applies to the function of the controllable clutch 54 on the 1 and 2 and the associated figure description referenced.

In step 303, by the mechanical action of the water jets or the cleaning jets, a detachment and, inter alia, a break-off of both soft and hard deposits on the tube inner wall of the well shaft 3 and in the filter slots (penetration holes 2 ). Furthermore, a break-off of both soft and hard deposits in the contact zone filter ear (shaft wall 1 ) and filter gravel (gravel layer 4 ), in the pore spaces of the filter gravel (gravel layer 4 ), ie in the spaces between the filter gravel, in the contact zone filter gravel (gravel layer 4 ) and borehole wall (of the complete well shaft) and in the upcoming soil (eg mountains). Damage to the material of the well (eg filter tube) as well as compaction (settling) or destruction (due to gravel friction) are avoided in the process described herein.

At 304, a continuous pumping out of the mixture of well water and solids (eg sand, sludge) as well as the detached deposits takes place. The pumping down takes place during the cleaning process. The amount of the pumped mixture also depends on the amount of water or cleaning fluid over the first rotary nozzle assembly 6 and the second rotary nozzle assembly 42 in the working chamber 38 is introduced.

At 305, the cleaning process is checked. For this purpose, measuring samples are taken at a time interval of, for example, 5 minutes. A sample of about 10 liters may be taken in a spiked glass or Imhoff funnel to determine the turbidity of the mixture. After a certain period of time can then be measured how much solids are still contained in 1 liter, 3 liters, 5 liters or 10 liters of water. In addition, there is a continuous measurement of the amount of the pumped mixture, the pH of the pumped mixture, the conductivity of the pumped mixture, the temperature of the pumped mixture and the redox potential of the pumped mixture.

At 306, a decision is made as to whether the result of a measurement is too high or not, and the value or amount used to determine whether it is above or below falls upon a variety of factors and may also vary for the well wells to be cleaned , However, a value or amount is set, which is used as a standard for cleaning. If, for example, the turbidity value is too high ("J"), then cleaning is continued (303). In addition, proper disposal (311) of the extracted deposits and of the sand and other solids is carried out. Furthermore, a quantitative accounting of the applied deposits (for example, by measurement over pointed glass or measurement of the dry matter) can be made per working section and in total.

If it is determined at 306 that the liquid being pumped has, for example, a turbidity which is below a previously set value (N), the working section is regenerated, ie cleaned. Subsequently, at 307, the sealing device (sealing elements 19 and 21 ) and / or move the device, for example, to the next work section to be cleaned, preferably a cleaning is always from the bottom up. For this purpose, it is determined at 308 whether the previously cleaned or regenerated working section was the last working section to be cleaned. If not ("N"), the cleaning process is continued, repeating steps 302 through 307. If the previously cleaned or regenerated working section is the last work section to be cleaned, the process continues to 309, with the device being removed from the well.

For this purpose, a power pumping test can be carried out in order to carry out a review of the regeneration success. Then the well or the filter section of the well is cleaned at 310 according to DVGW-W130. It is a mechanical cleaning or regeneration carried out, with sediments (sand, mud) are brought out of a well. Thus, apart from the separation of deposits, there is also a partial desanding of the well.

4 shows a diagram illustrating an exemplary cleaning history. On the x-axis is the time per working section and on the y-axis, the amount of detached deposits and solid components is plotted. The time is exemplary in 10 steps ( 10 min, 20 min, etc.).

The graph 60 represents the amount of detached deposits and solid components in the pumped mixture. During the cleaning, the mixture of water and detached deposits and solids is continuously pumped out and a measurement of the pumped mixture takes place every 10 minutes. Immediately after the start of the cleaning (within the first 10 minutes), the amount of detached deposits and solid components increases sharply and reaches a maximum value in the second section (between 10 and 20 minutes). Then, the amount of detached deposits and solid components in the pumped mixture rapidly decreases, with the measured amount of detached deposits and solid components continuously decreasing, and from the point 62 reached a value in which the amount of detached deposits and solid components only insignificantly decreases, ie, remains substantially constant. The in 4 The course shown is only an example. So can from the point 62 no deposits and solid components are more detectable or the amount of detached deposits and solid components is negligible.

LIST OF REFERENCE NUMBERS

1

shaft wall

2

penetrating hole

3

well shaft

4

gravel layer

5

soil

6

Rotating nozzle arrangement

7a

high-pressure nozzle

7b

high-pressure nozzle

8a

nozzle arm

8b

nozzle arm

9

supply

10

feed pipe

11

guide sleeve

12

pinion

13

pinion

14

engine

15

Rotational transition

16

High pressure hose

17

suction tube

18

separating element

19

sealing element

20

separating element

21

sealing element

22

renewal

23

camp

24

pipeline

25

control unit

26

Valve

27

measuring distance

28

arrow

29

arrow

30

cleaning fluid

31

spot beam

32

arrow

33

arrow

34

outlet opening

35

arrow

37

pressure sensor

38

working chamber

40

Unterwasserpumpe

42

Rotating nozzle arrangement

50

spot beam

52

supply

54

clutch

60

graph

62

Point

Claims (13)

A device for cleaning the inner surface of liquid-carrying pipes, comprising at least a first rotational nozzle assembly (6) concentrically movable in the pipe and at least one second concentric rotation nozzle assembly (42) concentric with the pipe, each having radially directed nozzles (7a, 7b) moving relative to the inner surface of the tube upon exit of a jet of water or solvent in a working section, wherein - the first rotary nozzle assembly (6) is coupled to a rotary drive device, - at least one second rotary nozzle assembly (42) with the first rotary nozzle assembly (6) - The second rotary nozzle assembly (42) with the first rotary nozzle assembly (6) is coupled via at least one device, - The second rotary nozzle assembly (42) with respect to the first rotary nozzle assembly (6) in terms of magnitude greater rotational speed in a first mode of operation via which at least one means is rotatable, and - via the at least one means the second rotating nozzle assembly (42) is movable in the same direction and at the same rotational speed as the first rotating nozzle assembly (6) in a second mode of operation when the amount the rotational speed of the second rotary nozzle assembly (42) is less than the amount of rotational speed of the first rotary nozzle assembly (6). Device after Claim 1 wherein the first and second rotary nozzle assemblies (6, 42) are movable up or down within a working section, the working section being formed by a working chamber (38). Device after Claim 2 , wherein in the working chamber (38) a suction device opens, via which during a cleaning cycle contaminated water can be pumped and the cleaning process can be monitored. Device after Claim 2 or 3 , wherein the working chamber (38) is displaceable by removing a pressure from limiting separating elements (18, 20) in height. Device according to one of Claims 1 to 4 wherein the at least one device is a freewheel device. Device after Claim 5 wherein the freewheel device is an overrunning clutch. Device according to one of Claims 1 to 4 wherein the at least one means is a controllable coupling (54) which permits opposite rotation of the second rotating nozzle assembly (42) to the first rotating nozzle assembly (6) in the first mode of operation and in the second mode via locking means co-rotating the second rotating nozzle assembly (42 ) with the first rotary nozzle assembly (6). Device after Claim 7 wherein the controllable clutch (54) is coupled to at least one speed detection device and an actuator for coupling the first rotary nozzle assembly (6) to the second rotary nozzle assembly (42) via the detent means. Device after Claim 7 or 8th wherein the controllable coupling (54) comprises a braking device. Device according to one of Claims 1 to 9 wherein the first and / or second rotary nozzle arrangement (6; 42) are arranged on a longitudinally movable transport device and / or in the center of a separating element (18) on a pipe feed line. Device according to one of Claims 1 to 10 wherein at least one further rotary nozzle assembly is coupled to the first and / or second rotary nozzle assemblies (6; 42) via at least one further device such that the at least one further rotary nozzle assembly and the second rotary nozzle assembly (42) are moved with the first rotary nozzle assembly (6) when the amount of rotational speed of the at least one further rotary nozzle assembly and / or the rotational speed of the second rotary nozzle assembly (42) is less than the amount of rotational speed of the first rotary nozzle assembly (6). Device according to one of Claims 4 to 11 in which the separating elements (18, 20) are packers which can be filled with a gas or a liquid, consist of an elastic foam or are a composite of several packers and / or disk-like separating elements. Method for cleaning the inner surface of liquid-carrying pipes with a device according to one of Claims 1 to 12 comprising a first rotary nozzle assembly (6) and at least one second rotary nozzle assembly (42) each having radially directed nozzles (7a, 7b) which move relative to the inner surface of the tube upon exiting a stream of water or solvent in a working section and are coupled to each other via at least one device, wherein - in a first mode, the second rotary nozzle assembly (42) is rotated with respect to the first rotary nozzle assembly (6) amounts greater rotational speed, - the second rotary nozzle assembly (42) in the same direction and with at the same rotational speed as the first rotating nozzle assembly (6) is rotated over the at least one means when the amount of rotational speed of the second rotating nozzle assembly (42) becomes smaller than the amount of rotational speed of the first rotating nozzle assembly (6).

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