DE102011117060A1 - rinsing - Google Patents

Abstract

The flushing device for cleaning fluid systems having fluid passages is characterized in that the flushing device comprises a circulation loop, in which a flushing tank, a circulation pump, and at least two valves are integrated, and in that the circulation loop line has two flushing tubes whose ends are provided with couplings are coupled to fluid channels of a fluid system, so that the fluid channels are enclosed in the circulation circuit.

Description

Many industrial processes require elevated temperatures or high temperatures. By adding a coolant, these temperatures are regulated or the process is cooled. Examples of this are molds for injection molding machines, which generally have fluid channels for tempering the tools. Also heat exchangers such. As tube, plate or Spiralwärmeteuscher are within the meaning of the preamble such fluid systems.

Depending on the period of use, the chemical and / or biological contamination of the aqueous cooling agents used for tempering contaminates the liquid-wetted surfaces of the fluid system with the serious disadvantage of a poor temperature control, due to the poor heat transfer.

A variety of publications describe the physical or chemical self-cleaning of the coolant. Depending on the process temperature, structure of the fluid system, flow velocity of the cooling fluid and type of cooling fluid, the physical or chemical self-cleaning is not very successful, even with regard to bacterial deposits.

In particular, expensive molds for injection molding machines can fail due to contaminated cooling holes, or considerably jeopardize process safety. The contamination of heat exchangers reduces their efficiency and also their process reliability.

The present invention has for its object to provide a rinsing system for cleaning a fluid system that is structurally simple and avoids the above disadvantages.

This object is solved by the features of claim 1.

Advantageous embodiments of the invention are characterized in the subclaims.

The system according to the invention is connected to the fluid system. Especially in stationary facilities such. As heat exchangers or heavy molds is advantageously used a mobile system with flexible flushing hoses. The rinsing system is first brought into spatial proximity of the fluid system and connected there by means of couplings.

A stationary installation is not excluded.

The plant includes in the basic version a rinsing tank or tank, a circulation pump, at least one non-return and another pressure-holding valve, and preferably a compressed air supply and a filter installed in the circulation circuit. Advantageously, the system is mounted on a mobile platform. For reasons of clarity, order and mobility, the rinsing tubes can be rolled up on castors with retraction.

For automatic dosing of cleaning agents, the system can be extended with a simple dosing system, which may consist of a venturi pump, a conductivity and / or pH measurement and a connected cleaning concentrate.

If no dosing system is present, the tank with a rinsing liquid, which consists of a carrier liquid such. As water and a proportionate rinsing or preserving concentrate is filled.

Since these are usually aggressive, harmful cleaning fluids, a pressure hold by means of air or rinsing fluid is carried out at the beginning in order to avoid later leaks or disconnections.

Advantageously, during cleaning, air can be introduced into the cleaning circuit in a continuous or pulsed manner for the dissolution of crystalline residues in the fluid system. In addition, there is the possibility of thermal support of the cleaning process by a heater.

To complete a cleaning, it is advantageously possible to introduce a preservative into the rinsing tank, or to dry the fluid system by means of air, or else to convey an aerosol mixture into the fluid system. In this case, the spent rinsing liquid by the introduced air from the Be promoted fluid system and the connected lines back into the tank to use them by means of a treatment system, or to promote a treatment tank or simply discard it in a drain.

The plant is advantageously combined with both a water treatment plant, as well as with a plant for the treatment of spent rinse liquid.

The system of the invention is easy to use and hygienic. For this purpose, the flexible connections can be plugged after cleaning to a parking station.

Thus, this plant not only meets economic, but also environmentally friendly claims.

1 shows a fully equipped cleaning system, which is connected via the connection ( 1 ), the water inlet valve ( 2 ) and the flow meter or water meter ( 3 ) is connected to a water supply or not shown here water treatment system. The processing filter ( 32 ) with its components is shown as a possible option only for clarity.

The supplied liquid flows into the washing container ( 4 ) until the flow meter ( 3 ) or the level sensors ( 5 ) of the end of the feeder. By means of circulation pump ( 9 ), the liquid is passed through the mixing line ( 8th ). The circulation pump ( 9 ) be used both air and electrically operated. Before the start of the cleaning of the fluid system ( 20 ), all connections of the system can be physically or chemically cleaned. This is both about the heater ( 11 ) as well as via an ozone cell or the rinsing concentrate (not shown here) ( 29 ) possible.

Before the start of the cleaning of the fluid system ( 20 ), all connections of the system, but especially the couplings ( 28 ) of the flushing tubing ( 19 ) subjected to a pressure holding test. For this purpose, pressure-retaining valve ( 31 ), the pressure-regulated air supply ( 17 ) and briefly put pressure on the connections. Remains the of the pressure measurement ( 16 ) monitored pressure drop within a specified limit, the connections are considered tight. The pressure holding test can also be carried out with liquid. This is done with a filled tank ( 4 ) the pump ( 9 ) started shortly, the valve ( 31 ) remains closed. The pressure holding test is carried out by means of pressure measurement ( 16 ) supervised.

With manual dosing, the desired amount of liquid is added to the tank ( 4 ) either over the lid ( 7 ) or the downstream flushing hose ( 19 ) until the mark at mark ( 42 ) is reached. Thereafter, the rinsing concentrate is added manually.

The dosage of the rinsing concentrate takes place in a system with dosing system via a Venturi pump ( 24 ) and the opened concentrate valve ( 25 ). The aspiration process is monitored by conductivity and / or pH measurement and is terminated when a predetermined concentration has been reached.

For cleaning the fluid system ( 20 ) the flushing hoses ( 19 ) with the couplings ( 28 ) to the connections of the fluid system ( 20 ). Depending on the distance to the fluid system ( 20 ) are the flushing hoses ( 19 ) on castors with retraction ( 45 ) and are pulled out of the rinsing system for connection or, after use, automatically rolled up and, if necessary, onto the parking station ( 18 ).

The pump ( 9 ) circulates the rinsing liquid from the container ( 4 ) via the fluid system ( 20 ), the filter ( 21 ) into the flushing line ( 8th ). Detached particles remain in the filter ( 21 ) and are cyclically by means of filter rinsing valve ( 22 ) rinse.

To increase the discharge pressure or the delivery volume, it is possible to increase the air pressure at the pump drive in the case of air-operated pump drives. For electrically operated drives, the check valve ( 15 ) are opened manually.

To increase the cleaning efficiency by cavitation in the fluid system ( 20 ) can continuously or cyclically air also different pressures over the air connection ( 17 ).

After completion of a cleaning process, the rinsing liquid can be discharged via the drain valve ( 14 ) or with existing treatment filter ( 32 ) are partially supplied to a regeneration tank. For emptying the fluid system ( 20 ), the liquid from the fluid system ( 20 ) and the lines ( 19 ) repressed.

When desired preservation of the fluid system ( 20 ) can after cleaning and emptying the container ( 4 ) a preservation with the preservative concentrate ( 27 ) be performed. This process is identical to the rinsing process. Both the cleaning concentrate ( 29 ) as well as the preservation concentrate container ( 27 ) can be monitored with a fill level monitor ( 30 ).

If the flushing fluid is toxic, the water meters ( 2 / 37 ) are used to demonstrate the fluid balance.

In the case of a fluid system with volumes larger than the tank volume, it may be necessary to re-meter and rinsing the rinse cycle ( 8th ) to separate from the atmospheric pressure. This is tank overflow ( 6 ) closed. When exceeding a given max. permissible system pressure at the measuring point ( 13 ), the drain valve ( 14 ) are opened for pressure equalization.

In hygienically demanding applications, there is also the possibility of how 2 shows, use highly pure, residue-free liquid as a carrier liquid. For this purpose, the rinsing system at the connection ( 1 ) is preferably connected to a reverse osmosis. To further improve the water quality is the addition of further treatment stages after reverse osmosis such. B. electrodeionization and / or additional filter stages possible.

This rinsing system combined with a high-purity water treatment can be used both for external and internal cleaning of hygienically demanding components. The high-purity rinsing liquid is in this application to that in a high-purity fluid chamber ( 43 ) conveyed introduced cleaning. The supply of the cleaning fluid takes place via a sterile filter ( 38 ) whose functionality is achieved by supplying air to the primary circuit ( 38a ) Is tested.

About a suction pump 41 the accumulating cleaning fluid is pumped out.

Since this embodiment is generally stationary installations, the treatment of the rinsing liquid preferably takes place by means of a dosing system according to the procedure already described 1 , Legend 1 water supply 2 Water inlet valve 3 Flowmeter / water meter 4 rinse tank 5 level sensor 6 Tank overflow with valve 7 filler cap 8th flushing line 9 circulation pump 10 check valve 11 Heating with temperature sensors 12 Conductivity and or pH measurement 13 pressure measurement 14 drain valve 15 check valve 16 pressure measurement 17 air supply 18 Tube Park Station 19 irrigation tubing 20 fluid system 21 strainer 22 Filterspülventil 23 drainage 24 venturi pump 25 concentrate valve 26 conservation valve 27 Preserving concentrate container 28 clutches 29 Spülkonzentratbehälter 30 empty detection 31 Pressure holding valve 32 treatment filters 33 Überströmpumpe 34 flow resistance 35 bypass valve 36 retentate 37 Retentatwasseruhr 38 sterile filter 39 Sterile liquid feed 40 flushing system 41 suction Pump 42 tank marker 43 High purity fluid chamber 44 sterile filter 45 Hose reels with retraction

Claims (5)

Flushing device for cleaning fluid systems having fluid channels, characterized in that the flushing device has a circulation circuit line, into which a rinsing container ( 4 ), a circulation pump ( 9 ), and at least two valves ( 10 . 15 . 31 ) are integrated, and that the circulation circuit line two rinsing ( 19 ) whose ends with couplings ( 28 ), which can be coupled to fluid channels of a fluid system, so that the fluid channels are enclosed in the circulation circuit. Flushing device according to claim 1, that in the circulation circulation line a compressed air line ( 17 ) opens a compressed air source. Flushing device according to claim 1 or 2, characterized in that in the circulation circuit line a filter ( 21 ) is integrated. Flushing device according to claims 1 to 3, characterized in that the circulation circuit line with a device ( 24 ) is provided for metering in cleaning agents. Flushing device according to claims 1 to 4, characterized in that the flushing device is mounted on a mobile platform.

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