EP2238354B1 - Verfahren und vorrichtung zum entwässern einer hydraulikflüssigkeit - Google Patents

Verfahren und vorrichtung zum entwässern einer hydraulikflüssigkeit Download PDF

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Publication number
EP2238354B1
EP2238354B1 EP08869431A EP08869431A EP2238354B1 EP 2238354 B1 EP2238354 B1 EP 2238354B1 EP 08869431 A EP08869431 A EP 08869431A EP 08869431 A EP08869431 A EP 08869431A EP 2238354 B1 EP2238354 B1 EP 2238354B1
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EP
European Patent Office
Prior art keywords
cleaning agent
valve
hydraulic fluid
sorbent
vessel
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Not-in-force
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EP08869431A
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German (de)
English (en)
French (fr)
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EP2238354A1 (de
Inventor
Ingo Scheel
Ralf Pohlmann
Wolfgang Erdmann
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Airbus Operations GmbH
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Airbus Operations GmbH
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Publication of EP2238354A1 publication Critical patent/EP2238354A1/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering

Definitions

  • the invention relates to a method for dehydrating a hydraulic fluid, in particular in the aerospace sector, and to a device for carrying out such a method.
  • the invention further relates to a unit for draining a hydraulic fluid of a hydraulic system, to a method for controlling such a unit, to an aircraft or spacecraft with such a device or unit, and to a ground maintenance machine having such a device or unit.
  • the hydraulic fluid used in aircraft hydraulic systems is typically highly hygroscopic.
  • the consequence of increasing the water content in the hydraulic fluid due to the absorption of the water is the formation of acids and other undesirable chemical changes. From a certain water content, corrosion damage to valves and pumps can occur, which is not tolerable in view of the special safety requirements in aviation.
  • a disadvantage of the known method is that the drainage is relatively slow.
  • a method for dehydrating a hydraulic fluid in particular in the aerospace sector, provided, wherein the hydraulic fluid is passed through a sorbent, which extracts the hydraulic fluid water.
  • a device for dehydrating a hydraulic fluid of a hydraulic system in particular in the air - and space area, with a tank, an inlet and a return.
  • the container has a sorbent.
  • the hydraulic fluid is supplied to the container from the hydraulic system for a flow of the hydraulic fluid through the sorbent for dehydrating the hydraulic fluid in a dewatering mode of the device.
  • the return path returns the dewatered hydraulic fluid from the reservoir to the hydraulic system in the dewatering mode of the device.
  • a unit for dewatering a hydraulic fluid of a hydraulic system in particular in the aerospace sector, is provided with at least two of the devices according to the invention.
  • the devices are merely switched alternately into the regeneration mode by means of a common control device.
  • an aircraft or spacecraft is provided with the device according to the invention or with the unit according to the invention.
  • a soil maintenance machine is provided with the device according to the invention or with the unit according to the invention, wherein the soil maintenance machine can be connected to a hydraulic system of an aircraft or spacecraft for dewatering the hydraulic fluid.
  • the water content of the hydraulic fluid is determined before and / or after passage through the sorbent.
  • a regeneration mode for regenerating the sorbent is started.
  • the water content should be measured after passing through the sorbent, since then clearly and It can be determined immediately whether the sorbent still has a sufficient sorption capacity.
  • the first limit may correspond to 0.5% water content in the hydraulic fluid, which is the maximum permitted in aviation. Such a method is very easy to implement control technology.
  • the first limit value is set slightly below the 0.5% limit, for example 0.3 or 0.4%, so that the water content in the hydraulic fluid at no time, even during the regeneration of the sorbent, does not exceed the predetermined 0 , 5% limit rises.
  • a "regeneration mode” comprises the operating modes which are necessary for a resumption of the dehydration mode, after it has been established that the sorption capacity of the sorbent is exhausted. For a resumption of the dewatering mode it is necessary to restore the sorption capacity of the sorbent.
  • the device may be in the dewatering mode or in the regeneration mode.
  • the regeneration mode is in turn subdivided into a discharge operation, re-drying operation, filling operation and / or cleaning operation.
  • a regeneration mode is used Regenerating the sorbent started.
  • the amount of the difference gives an indication of the extent to which the sorption capacity of the sorbent is exhausted. If, for example, this is already largely exhausted, the amount of the difference will be correspondingly small, but only if there is a certain water content in the hydraulic fluid - with a very low water content in the hydraulic fluid, the amount of the difference must inevitably be small. This fact does justice to this improvement of the method, the second limit value being determined as a function of the measured water content.
  • the sorption agent is separated from the hydraulic fluid in the regeneration mode and the sorbent is dried back.
  • back-drying is meant herein the removal of the water bound in the sorbent.
  • the re-drying of the sorbent is carried out by means of heat and / or by means of reduced pressure. These represent very simple measures for re-drying the sorbent.
  • the re-drying is carried out at least by means of reduced pressure and determines the end of the re-drying by falling below a limit value for the pressure change.
  • the degree of contamination of the hydraulic fluid is measured, and if the degree of contamination exceeds a contamination limit value, the sorbent, after being dried back, is rinsed with a cleaning agent for removing dirt particles from the sorbent.
  • the sorbent must be cleaned with appropriate contamination by dirt particles.
  • the hydraulic fluid is passed through the sorbent again after the regeneration mode.
  • the device can its purpose, namely the dewatering of the hydraulic fluid, correspond again.
  • the sorbent is selected from the group consisting of silica gel, sepiolite and molecular sieve, and / or the hydraulic fluid based on phosphate ester.
  • Phosphate ester is a widely used in aviation hydraulic fluid.
  • the sorbents can have geometries with large surfaces, so as to achieve a high sorption capacity.
  • moisture sensors for measuring are in the inlet and / or in the return the water content provided in the hydraulic fluid and is further provided a control device which is connected by signal technology with the humidity sensors.
  • the humidity sensors could also be provided in the hydraulic system itself, but this is inconvenient in certain applications of the apparatus, especially in connection with a ground maintenance machine, as this would require provision of such sensors in each aircraft, rather than providing such sensors once in the ground maintenance machine ,
  • Such moisture sensors are preferably based on a capacitive measurement, in particular taking into account the temperature of the hydraulic fluid.
  • the controller switches the device from the dewatering mode to a regeneration mode for regenerating the sorbent when the measured water content, especially the water content in the return, is above a first threshold.
  • control device switches the device from the dewatering mode to a regeneration mode for regenerating the sorbent when the amount of the difference in water content in the inlet and the return is below a second threshold, the control device setting the second threshold in dependence on the measured water content in the inlet or return determined.
  • the container is coupled to the inlet by means of an inlet valve and to the return by means of a return valve. This allows flexible control of the hydraulic fluid in the container.
  • the inlet valve is provided at an upper end of the container and the return valve is provided at a lower end of the container, with “top” and “bottom” referring to the ground.
  • the container is coupled by means of a compressed air valve with a compressed air line, wherein the control device blocks the supply valve in a discharge operation of the regeneration mode and opens the return valve, wherein the compressed air empties the hydraulic fluid from the container in the return through the open return valve.
  • a "locked" valve is understood to mean a state in which the valve prevents a flow of fluid therethrough and, under an "open” valve, means a state in which the valve releases a flow of fluid therethrough.
  • control device locks in the emptying operation, the compressed air valve again when a signal technically connected to the control device level sensor signals that the hydraulic fluid is discharged from the container.
  • the container is coupled to a vacuum line by means of a vacuum valve, wherein the control device blocks the return valve in a back-drying operation of the regeneration mode downstream of the emptying operation and opens the vacuum valve, wherein the vacuum applied to the container then re-dries the sorbent.
  • the "vacuum” is nothing else than the reduced pressure already described in connection with the process.
  • the applied to the sorbent vacuum leads to evaporation of the bound water in the sorbent, wherein the resulting water vapor is removed via the vacuum valve.
  • the container is coupled by means of a vent valve with a vent line, wherein a heater is provided, wherein the control device in a subsequent emptying operation remindtrocknungs beautiful the regeneration mode blocks the return valve, opens the vent valve and the heater for supplying heat to the sorbent for a re-drying of the same switches.
  • both embodiments are used simultaneously, wherein at least the amount of heat is supplied by means of the heating device, which is withdrawn from the sorbent during the evaporation process.
  • the vent valve can simultaneously serve as a vacuum valve and accordingly serve the vent line as a vacuum line.
  • the container is coupled by means of a vent valve with a vent line, wherein the control device in a back-drying operation downstream filling operation of the regeneration mode the vent valve and the inlet valve for filling the container with the hydraulic fluid opens.
  • the inlet valve In order to switch the device back into the dewatering mode, it is necessary that the inlet valve is opened, whereby hydraulic fluid can again flow into the container. But the air in the container must be able to escape. This can be done through the open vent valve. Finally, the feed valve must be reopened to allow re-flow of hydraulic fluid from the hydraulic system into and out of the sorbent container through the return to the hydraulic system.
  • control device closes the venting valve again in the filling operation and opens the return valve when a fill level sensor which is signal-technically coupled to the control device signals a desired fill level. Subsequently, the control device switches the device again from the regeneration mode to the drainage mode.
  • a fouling sensor which measures a degree of contamination of the hydraulic fluid and provides it to the control device, wherein the container is coupled by means of a rotatesffenzulaufventils with a detergent inlet and by means of a detergent return valve with a detergent return, the control device after the remindtrocknungs concede and before the filling operation the device switches to a cleaning operation to remove debris from the sorbent when the controller determines that the fouling level exceeds a fouling limit, the controller closing the vacuum valve and / or the bleed valve and opening the detergent feed and return valve, then the cleaning agent the sorbent flows through and deprives it of dirt.
  • the detergent feed and the detergent return are coupled to a cleaning container, wherein a detergent pump and a filter for cleaning the cleaning agent are provided, wherein the detergent pump, the detergent through the container, the detergent return, the detergent container, the filter and the detergent feed in circulates the cleaning operation, the filter filters dirt from the detergent.
  • the filter is provided with a clogging indicator and replaceable. This makes it possible to replace the filter as soon as it is dirty.
  • the detergent container to a vent, wherein the control device in the cleaning operation after circulating the detergent for emptying the same from the container closes the detergent return valve and opens the compressed air valve, the compressed air empties the detergent into the detergent inlet and compressed air from the Detergent container escapes through the vent.
  • the detergent pump and the filter are arranged in the detergent feed or in the detergent return, wherein a detergent discharge line is provided with a detergent discharge valve, which bypasses the detergent pump and / or the filter, wherein the control device for emptying the container opens the cleaning agent purge valve and the detergent inlet valve or the detergent return valve locks.
  • the cleaning agent can be emptied out of the container very quickly, since it does not have to flow through the detergent pump or the filter, which represent a high flow resistance.
  • a flow through the filter in the reverse direction could lead to the fact that the dirt particles trapped in it are distributed in the detergent circuit.
  • a cleaning agent contamination sensor which measures a level of contamination of the cleaning agent and provides it to the control device, wherein the control device provides a warning signal to a display device when the degree of contamination of the cleaning agent exceeds a cleaning agent contamination limit.
  • the unit according to the invention four of the devices, for example devices A, B, C and D, are provided whose common control devices switch them only alternately into the dewatering mode, emptying mode, re-drying mode and filling mode.
  • the required amount of sorbent per container can be minimized because the amount of sorbent provided in each container must last just as long as the longest operation (discharge operation, re-drying operation or filling operation) lasts.
  • the size of the container can be minimized.
  • Fig. 1 schematically shows a unit 1 for dehydrating a hydraulic fluid of a hydraulic system 2, for example, that of an aircraft.
  • the hydraulic fluid is a phosphate ester.
  • the unit 1 is part of a floor maintenance machine, such as typically found at airports.
  • the unit 1 comprises a first device 3, a second device 4, a third device 5 and a fourth device 6.
  • Each of the devices 3 to 6 has a container 10, wherein the containers 10 are all fluidly coupled by means of a common inlet 11 and a common return 12 with the hydraulic system 2.
  • the coupling of the unit 1 with the hydraulic system 2 takes place, for example, during maintenance of the aircraft with the hydraulic system 2 and is temporary in nature, ie. H. the ports 13, 14 of the inlet 11 and return 12 to the hydraulic system 2 are detachably formed.
  • a hydraulic pump 17 is preferably arranged in the inlet 11, which pumps the hydraulic fluid through the unit 1.
  • a filter 18 with a clogging indicator is preferably arranged in the inlet 12.
  • a corresponding filter 22 with clogging indicator is also preferably arranged in the return 12 following the check valve 16.
  • a flow sensor 23 is preferably provided in the inlet 11. By means of the flow sensor 23 can be determined whether and in what amount hydraulic fluid flows through the unit 1.
  • the flow sensor 23 is preferably followed by an adjustable pressure reduction valve 24 in the inlet 11, by means of which the pressure in the hydraulic fluid, which is supplied to the containers 10, is adjustable.
  • a check valve 25 adjoining the pressure reduction valve 24 in the inlet 11 prevents flow of the hydraulic fluid opposite to the direction of flow in the inlet 11 provided with the reference number 26.
  • the inlet 11 below the check valve 25 has a safety line 27 connected to the return 12 with a safety valve 28.
  • the safety valve is in the normal state in the Fig. 1 illustrated position, wherein there is a flow of hydraulic fluid prevented by the inlet 11 in the return 12 through the safety line 27. If, however, an error occurs which prevents the hydraulic fluid from flowing from the inlet 11 through the container 10 into the return 12, and the pump 17 continues to supply hydraulic fluid, the safety valve 28 opens when a certain limit value for the permissible hydraulic fluid pressure is exceeded and the hydraulic fluid can then flow from the inlet 11 in the return line 12. Damage to, for example, lines and valves can thus be prevented.
  • the inlet 11 and the return 12 preferably have downstream of the filters 18 and 22, respectively, a moisture sensor 32 and 33, which measures a water content in the hydraulic fluid.
  • Fig. 2 is one of the humidity sensor 32, 33 shown by way of example, which projects with its moisture sensor 32a in the inlet 11 and there measures the moisture of the hydraulic fluid capacitively.
  • the humidity sensor is further equipped with a temperature sensor 32b, which provides a temperature of the hydraulic fluid. The measured temperature flows in determining the humidity of the hydraulic fluid.
  • each of the devices 3 to 6 has two humidity sensors, one before and the other after the container 10, so that the water content before and after each of the containers 10 can be determined individually for each of the devices 3 to 6 is.
  • the in Fig. 1 variant shown comparatively parts saving, since it only requires two moisture sensors 32, 33.
  • the devices 3 to 6 are identical. Therefore, the structure of the device 3 will be exemplified below.
  • the container 10 is a cartridge, d. H. as a cylindrical container, which extends substantially perpendicular to a not further illustrated soil 40 is formed. "Below” and “above” below always refer to the ground 40.
  • the container 10 is at its upper end 29 by means of a trained as an electromagnetically actuated 2/2-way valve inlet valve 34 to the inlet 12 and at its lower end 30 by means of an electromagnetically actuated 2/2-way valve formed return valve 35 with the return 12 fluidly coupled.
  • a check valve 36 is preferably arranged, which prevents a flow of hydraulic fluid from the return line 12 into the container 10 at any time. This prevents mutual interference of the containers 10 of the devices 3 to 6.
  • the check valve 36 seals a container 10, which is described in more detail later Emptying operation is compared with the pressure in the return line 12 from hydraulic fluid.
  • an upper and a lower level sensor 37 and 38 are provided which generate a signal when a first limit for the level in the container 10 is exceeded or when a level in the container 10 exceeds a second threshold.
  • the level sensor 37 and 38 are arranged on a measuring column 39, whose lower end is fluidly connected to a line 43 connecting the return valve 35 to the return line 12 and whose upper end is connected to the upper end of the container 10.
  • a level 44 of the hydraulic fluid in the metering column 39 corresponds to the level 45 of the hydraulic fluid in the reservoir.
  • the lower level sensor 38 does not generate a signal until the line 43 is at least partially depleted, so that the level 44 in the measuring column drops below the position of the level sensor 38. This ensures that the level sensor 38 only generates a signal when the container 10 is completely emptied.
  • the container 10 has in its interior a sorbent 46, for example a silica gel on.
  • the sorbent 46 is adapted to extract water from the hydraulic fluid.
  • the container 10 also has a heating device 47, which is designed, for example, as heating rods, which are flowed through when closing an electromagnetic switch 48 and generate heat that heats the sorbent 46.
  • the container 10 is at its upper end 29 by means of a formed as an electromagnetically actuated 3/3-way valve compressed air valve 52 with a compressed air line 53 fluidly coupled.
  • the compressed air line 53 is acted upon by means of a compressor 54 and a downstream filter 55 with filtered compressed air.
  • the container 10 is further fluidly coupled by means of the compressed air valve 52 with a vent line 56, the vent line 56 having a filter 57 and a vent 58, which is at atmospheric pressure has.
  • the compressed air valve 52 has a first position, in which the container 10 is coupled neither to the compressed air line 53 nor to the vent line 56. In a second position, the container 10 is coupled to the compressed air line 53. In a third position of the compressed air valve 52, the container 10 is coupled to the vent line 56.
  • the upper end 29 of the container 10 is fluidically coupled by means of a designed as a 2/2-way valve vacuum valve 62 with a vacuum line 63, wherein the vacuum line 63 in the order given below preferably a settling tank 64, a vacuum pump 65 and preferably a water separator 66 ,
  • the settling tank 64 protects the pump from solid and liquid components.
  • the vacuum pump 65 By means of the vacuum pump 65, the vacuum line 63 with a vacuum (based on the atmospheric pressure) acted upon.
  • the vacuum valve 62 has two positions: in a first position, as in FIG Fig. 1 shown for the device 3, the vacuum line 63 is decoupled from the container 10, that is, there is no vacuum on the container 10 at. In a second position of the vacuum valve 62, the container 10 is fluidically coupled to the vacuum line 63 and there is a vacuum on the interior thereof.
  • Dirt particles in the extracted air can be filtered out in the settling tank 64 to protect the vacuum pump 65.
  • the water separator 66 for example an electrostatic precipitator, extracts from the air extracted from the container 10 the water which may be contaminated with hydraulic fluid (or with its additives).
  • a control device 67 is provided, which is signal-technically connected to all switchable elements 15, 16, 17, 24, 34, 62, 48, 35, 54, 65 for driving these and with all the signaling elements 18, 22, 33, 23, 32, 37, 38, 68, 69 signal technically connected to evaluate signals of the same (the electrical lines were not shown for reasons of clarity).
  • the controller 67 is formed as a flexible programmable PLC (memory-programmable controller).
  • control device 67 with a display device 73 (see also Fig. 3 ), on which, for example, measured values, the various operating states of the individual devices 3 to 6 or even warning signals, such as, for example, that a filter is to be exchanged, can be represented.
  • control device 67 is connected to the humidity sensor 32. Furthermore, the control device is connected to the already mentioned display device 73. Furthermore, the control device 67 is connected to a warning light 64 for warning an operator of the unit 1.
  • the powered by a plug-in power supply 75 control device 67 is flexibly programmable by means of a personal computer (PC) 76, which, for example, the entry of different limits for the permissible water content in the hydraulic fluid - these may be different for different types of aircraft, for example.
  • PC personal computer
  • each of the devices 3 to 6 could each have a compressed air line 53, vent line 56, vacuum line 63 and control device 67 (each with associated components), however, according to the present embodiment, in order to save parts, the devices 3 to 6 with a common compressed air line 53, vent line 56, vacuum line 63 and control device 67 is provided.
  • each of the devices 3 to 6 may have such a cleaning device 80.
  • a detergent inlet 81 is fluidically coupled to the line section 82 connecting the return valve 35 to the container 10, and a detergent return 83 is fluidically coupled to the line section 84 connecting the inlet valve 34 to the container 10.
  • first check valves 85, 86 are provided, which ensure in the closed state that no detergent 87 unintentionally penetrates into the lines 82, 84.
  • the check valve 85 branches off a drain line 92 from the detergent inlet 81, wherein the drain line 92 is fluidically coupled by means of a designed as electromagnetically controllable 2/2-way valve drain valve 93 with a detergent tank 94.
  • the detergent feed 81 Downstream of the discharge line 92, the detergent feed 81 has a detergent feed valve 95 designed as an electromagnetically controllable 2/2 way valve Detergent pump 96 and preferably a cleaning agent filter 97 with clogging indicator, after which the detergent feed 81 opens into the detergent tank 94.
  • a detergent feed valve 95 designed as an electromagnetically controllable 2/2 way valve Detergent pump 96 and preferably a cleaning agent filter 97 with clogging indicator, after which the detergent feed 81 opens into the detergent tank 94.
  • the check valve 86 is provided downstream of a designed as an electromagnetically controllable 2/2-way valve cleaning agent return valve 98, after which the detergent return 83 opens into the container 94.
  • the detergent container 94 is aligned substantially perpendicular to the ground 40 and has at its upper end 102 a vent 103 via a filter 104.
  • Each of the devices 3 to 6 can now be operated in the following enumerated modes: in a dewatering mode, see Fig. 1 , Device 3, in a drainage mode associated with a re-drying mode, see Fig. 1 , Device 4, in a re-drying mode associated with the regeneration mode, see Fig. 1 , Device 5, and in a the regeneration mode associated filling operation, see Fig. 1 , Device 6.
  • the hydraulic fluid flows from the hydraulic system 2 by means of the pump 16 through the inlet 11 into the container 10 and flows through there the sorbent 46, which thereby extracts the hydraulic fluid water. Thereafter, the hydraulic fluid flows from the container 10 in the return 12 and back into the hydraulic system 2.
  • the humidity sensors 32, 33 constantly measure the water content in the hydraulic fluid.
  • the humidity sensor 32 provides the controller 67 with the measured water content as such, a measured value MZ and the humidity sensor 33 provide the water content measured in the return as a measured value MR.
  • the control device 67 compares the measured value MR with a limit value G1 which, for example, amounts to 0.45% water content and is therefore just below the maximum permissible water content in the hydraulic fluid of 0.5%.
  • control device 67 If the control device 67 now determines that the measured value MR is above the limit value G1, it decides that the sorbent 46 no longer has sufficient sorption capacity to permanently keep the water content in the hydraulic fluid below 0.5%, ie the maximum permissible value , Then, the control device 67 switches the device 1 in the regeneration mode and begins within the regeneration mode with the emptying operation, as for the device 4 in FIG Fig. 1 is shown.
  • control device 67 constantly determines the amount of the difference BD between the measured value MR and the measured value MZ and compares this value BD with a limit value G2.
  • the limit value G2 is preferably calculated as a function of the measured value MZ.
  • the limit G2 represents an expected amount of the difference for a sorption agent 46 with "normal" sorption capacity. These values can be stored, for example, in a table.
  • the flow rate DR signaled by the flow sensor 23 can also be used in determining the limit value G2, since the flow rate influences the expected amount of the difference between the measured values MZ and MR - for example, at a high flow rate, the action time of the sorption agent 46 is on Hydraulic fluid reduced. Therefore, a smaller amount of the difference is expected.
  • control device If the control device now determines that the value BD is above the value G2, it likewise switches the device into the regeneration mode and, at first, into the emptying mode, as is the case for the device 4 in FIG Fig. 1 is shown.
  • the second calculation method it can be predicted earlier that the sorption capacity of the sorbent 46 is exhausted.
  • the control device 67 closes the inlet 11 by means of the inlet valve 34 and switches the compressed air valve 52 such that compressed air flows from the compressed air line 53 into the container 10.
  • the hydraulic fluid in the container 10 is discharged from the compressed air 105 in the return 12 through the open return valve 35.
  • the lower level sensor 38 signals the controller 67 when the container 10 is completely deflated and even a portion of the conduit 43 is deflated. This ensures that the container 10 is completely emptied.
  • control device 67 switches the compressed air valve 52 again such that no more compressed air flows from the compressed air line 53 into the container 10. Subsequently, the control device 67 closes the return valve 35, so that the container 10 is no longer fluidly coupled to the return 12.
  • the controller 67 switches to the re-drying operation, thereby switching the vacuum valve 62 so that the container 10 is connected to the vacuum line 63 and a vacuum is applied to the container. Due to the vacuum, the water bound by the sorbent 46 evaporates and escapes through the vacuum valve 62 and the conduit 63.
  • control device 67 switches the switch 48, so that current flows through the heating rods of the heating device 47 and the sorbent is heated. As a result, the evaporation of the water bound in the sorbent 46 is further stimulated.
  • the control device 67 constantly calculates the temporal pressure change MDZ and compares it with a limit value for the pressure change GD. If the value MDZ falls below the value GD, it is clear that the water bound in the sorbent 46 has dropped to a desired (low) content. Then, the heater 47 is switched off again by switching the switch 48 and the vacuum valve 62 is closed again.
  • the check valves 85, 86 (see FIG 4 and 5 ) and the detergent inlet valve 95 and the detergent return valve 98 are opened.
  • the drain valve 93 is closed.
  • the controller 67 starts the pump 96 and the cleaning agent 87 is circulated through the sorbent 46, whereby dirt particles are flushed out of the sorbent 46.
  • the washed-out dirt particles are in turn filtered out of the cleaning agent 87 by means of the filter 97.
  • the controller 67 stops the pump 96 again, closes the detergent inlet valve 85 and the detergent return valve 98 and opens the drain valve 93, as shown in FIG Fig. 5 ,
  • the control device 67 switches the compressed air valve 52 such that compressed air 105 flows from the compressed air line 53 into the container 10, thereby emptying the cleaning agent 87 from the container 10 into the detergent feed 81 (see Fig. 5 ), wherein the cleaning agent 87 is then emptied through the drain line 92 and through the open drain valve 93 in the detergent container 93, wherein it displaces the present in the detergent tank 94 air 106 from the detergent container 94 through the filter 104 and the vent 103.
  • the compressed air valve 52 is closed again, so that no more compressed air flows into the container 10, when it is determined that the entire cleaning agent 87 has been displaced from the container '10.
  • a suitable, not shown, sensor can be provided.
  • the cleaning agent 87 can be replaced at this point.
  • the controller 67 switches to the filling operation and opens the inflow valve 34 and switches the compressed air valve 52 so that the container 10 is connected to the vent line 56, whereupon the Hydraulic fluid from the inlet 11 flows into the container 10 and the existing compressed air 105 there from the container 10 in the vent line 56 through the filter 57 and the vent 58 displaced (in Fig. 1 shown for the device 6).
  • the controller 67 If the level 45 of the hydraulic fluid in the container 10 rises to a certain level, it activates the level sensor 37 and this signals the controller 67 that the container is refilled.
  • control device 67 switches the device 3 back into the dewatering mode, in which the hydraulic fluid is dewatered again by means of the sorbent 46.
  • the control device 67 switches the devices 3 to 6, only alternately into the dewatering mode, emptying mode, re-drying mode and filling mode. That is, when device 3 is in the dewatering mode, device 4 is in the dump mode, device 5 in the re-dry mode, and device 6 in the fill mode (see FIG Fig. 1 ).
  • control device 67 switches the devices 3 to 6 and the further device only alternately into the dewatering mode, emptying mode, re-drying mode, cleaning mode and filling mode.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Gases (AREA)
  • Treatment Of Liquids With Adsorbents In General (AREA)
  • Fluid-Pressure Circuits (AREA)
EP08869431A 2008-01-04 2008-12-22 Verfahren und vorrichtung zum entwässern einer hydraulikflüssigkeit Not-in-force EP2238354B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US996708P 2008-01-04 2008-01-04
DE102008003179A DE102008003179A1 (de) 2008-01-04 2008-01-04 Verfahren und Vorrichtung zum Entwässern einer Hydraulikflüssigkeit
PCT/EP2008/068193 WO2009087059A1 (de) 2008-01-04 2008-12-22 Verfahren und vorrichtung zum entwässern einer hydraulikflüssigkeit

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EP2238354A1 EP2238354A1 (de) 2010-10-13
EP2238354B1 true EP2238354B1 (de) 2012-10-03

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EP08869431A Not-in-force EP2238354B1 (de) 2008-01-04 2008-12-22 Verfahren und vorrichtung zum entwässern einer hydraulikflüssigkeit

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RU2010125323A (ru) 2011-12-27
DE102008003179A1 (de) 2009-07-16
BRPI0822234A2 (pt) 2015-06-23
EP2238354A1 (de) 2010-10-13
CN101918723B (zh) 2014-04-30
US20110168610A1 (en) 2011-07-14
US8216458B2 (en) 2012-07-10
CA2709761A1 (en) 2009-07-16
WO2009087059A1 (de) 2009-07-16
US20110017672A1 (en) 2011-01-27
JP2011511215A (ja) 2011-04-07
US8221630B2 (en) 2012-07-17

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