Installation for the cleaning of pipelines.

The invention relates to a device for cleaning of pipelines with an input-side connector for the liquid supply and an output side terminal for connection to the pipe to be flushed, and to a supply of the compressed air.

In particular, prior to commissioning of the water pipes, the same are flushed in a conventional manner with a water-air mixture. To this end, a water supply and a gas supply via respective valves are mutually connected to the pipeline.

Object of the invention is to provide a device of the type described above, which is simple in design and with a fast and reliable cleaning.

This object is achieved by a device of the type described in the introduction, which is characterized according to the invention by a controller for controlling the supply of compressed air and a water meter for measuring of the passing liquid, whose output signal is fed to the input of the controller.

According to a development of the invention, a pressure regulator is provided, whose input is connected to the input side of the water supply and which is so formed that a preset relationship between fluid pressure and air pressure is achieved. This ensures that the PRE-bene air pressure is kept constant even with changing water pressure, for example at a sampling on the input side.

According to another embodiment, the pressure regulator is designed as a differential pressure regulator, so that, for example, the air pressure must be by a predetermined value greater than the actual water pressure.

According to a development of the invention, the pressure regulator in its passage for the compressed air to an oil and water filter. With this measure, space-saving simple construction is achieved.

Preferably, a compressor is provided on the input side of the compressed air supply, which is mounted together with the other components on a chassis. This ensures that the entire device is mobile and is directly movable to the site, which is just for use on construction sites of great importance.

Further features and advantages of the invention will be apparent from the description of an embodiment with reference to FIGS. Of the figures:<ul><li>Fig. 1 is a schematic representation of the device;</li><li>2 shows a section through the pressure regulator in a first position.</li><li>Figure 3 shows the controller shown in Figure 2 in a second working position. and</li><li>Fig. 4 is a side view of the device.</li></ul>

The device comprises a between a water supply and to be washed pipe to be coupled pipe section 1 to an input side terminal 2 for connecting to the liquid supply and an output-side terminal 3 for connection to the to be purged conduit. Immediately after the input side terminal a water meter 4 in the form of a pulse water meter is provided to measure the flow. The output side of the pulse water meter is connected to the input of a control. 5

Further, a compressor 6 is provided. The output side of the compressor is connected via a compressed air line 7 connected to the input of an automatic pressure regulator eighth The output of the pressure regulator 8 via the compressed air line to an input of a solenoid valve 9. The outlet of the solenoid valve is connected to the input of a throttle check valve 10th The output of the throttle check valve leads to a Druckluftzuführstelle 11 in the pipe section. 1

Between the compressed air supply point 11 and the pulse water meter, a check valve 12 is provided, which blocks against a return flow in the direction from terminal 3 to terminal 2nd

As best seen in Figures 2 and 3 it can be seen, the pressure regulator 8 is configured as a differential pressure regulator. This comprises a control head 13, which is connected on its underside with a cup-like hood 15th The control head has a via the pressure line 7 to the compressor 6 to be connected to input 14, which opens into the space enclosed by the hood interior 15 16th Further, a coaxial to the input 14 arranged output 17 is provided which leads via a bore to the interior of the sixteenth At the space on the inner side 16 adjoining this bore an oil and water filter 18 is screwed interchangeably. Between oil and water filter and the output 17 a check valve 19 is provided. The valve body of this shut-off valve is biased by a spring 20 to its locked position.

The control head is also connected to a pressure chamber 21 a forming pressure chamber housing 22nd The inside of the pressure chamber has an input 23 which, as can be seen from Figure 1, is connected via a control line 24 to an output of the water meter 4th Perpendicular to the displacement path of the valve body 25 of the check valve 19 is a diaphragm 26 clamped between the pressure chamber housing 22 and the housing of the control head. 13 The membrane is on the pressure chamber side facing the interior acted upon by a compression spring 27 which bears with its other end on one of the membrane opposite inner wall of the pressure chamber interior. On its opposite side the pressure spring 27, the membrane 26 is connected via a plunger 28 with the valve body 25th The spring 27 is adjustable by a Handeinstelleinrichtung 29 in its pressure strength.

1 as is seen from Fig., A metering pump 30 is additionally provided, the input side is connected with a suction pipe 31 for sucking of dosing and on the output side via a check valve 32 with the pipe section 1 to be coupled in or on an additional pipe piece 33. The metering pump 30 and the suction pipe 31 are connected via control lines, and a connection plug 34 via a corresponding female terminal 35 and respective control lines to the control 5th

In operation, water flows via the input-side terminal 2 through the pipe section 1. The water meter 4 are dependent on the flow rate of electrical pulses to the electronic controller 5. This controls the solenoid valve 9 and connects and thus separates the compressor 6 to the compressed air feed point eleventh after opening the solenoid valve 9 by the controller 5, the compressed air via the throttle check valve 10 flows into the pipe piece 1. in this case, the flow of water for the duration of an incoming air pulse is interrupted in each case, and the water is passed through by compressed air. As is laid over the control line 24 of the input-side water pressure to the pressure chamber 21, the required air pressure will be automatically regulated as a function of the prevailing water pressure.

The measurement of the size of the membrane 26 and the strength of the compression spring 27 is chosen so that when applied in the pressure chamber 21 water pressure, the check valve 19 are just in the manner shown in Figure 3 so far open that by thus formed restrictor at the outlet 17, an air pressure prevails which is higher by a predetermined value than the existing water pressure. Preferably, the air pressure is, for example, each higher than the existing water pressure at a bar. When changing the flow rate through the tube section 1 and the input-side water pressure, the added amount of compressed air and the pressure is adjusted automatically. This creates a well-defined liquid-gas mixture is produced and eliminated an erroneous setting. The difference between the pressure prevailing in the pressure chamber 21 water pressure and the downstream air pressure is therefore created virtually by adjusting the compression spring 27th

As shown in Figure 1, an air gauge 36 and a water manometer 37 are still provided, on which the respectively prevailing pressures are read.

The controller 5 is designed such that the device described above in four different operating positions can be operated. First, the device can be operated as a normal compressor. The air is fed directly from the compressor 6 to the point of consumption.

In a second position the pipe flushing described above takes place.

In a third operating position additionally done to the pipe flushing a chemical dosing. For this purpose, the dispenser 30 and the suction pipe 31 as a conventional dosing via the controller 5 in response to the water meter 4 for quantitative dosing of Chemikals in the pipe section 1 and the pipe section 33 are driven. In one switching position of the compressor is powered off while it is also switched on in a further operation.

As shown in Figure 4, the entire device with the compressor 6 with an associated pressure vessel 38, the controller 5, the water meter 4, the pressure regulator 8 and the pipe section 1 is mounted with its terminals on a chassis. 39 In this way it is possible, the entire device with this chassis to go directly to the site and to take to connect to the pipe to be flushed directly into operation.