DE102020207534A1 - PROCEDURE AND PROCESSING ARRANGEMENT FOR A HYDRAULIC PRESSURE MEDIUM - Google Patents

Abstract

The present invention relates to a method for degassing and / or drying a hydraulic pressure medium, the method comprising the following steps: supplying pressure medium into a container (100) through an inlet opening (101) of the container (100); discharging the pressure medium from the Container (100) through an outlet opening (104) of the container (100); supplying gas into the container (100) through a ventilation device (200, 200 '); discharging the gas from the container (100) through the ventilation device, so that a negative pressure is formed in the container; the level of the pressure medium in the container during the degassing is detected by means of a float (113), the float (113) being hollow and uniformly round, the diameter of the float (113) preferably between 35 mm and 45 mm and the weight of the float (113) is preferably between 2.5 g and 2.9 g.

Description

TECHNICAL PART

The present invention relates to the technical field of pressure medium processing systems which are configured to remove dirt, pressure medium aging products, gases and free and dissolved water from a pressure medium, in particular from hydraulic and lubricating oils.

STATE OF THE ART

Hydraulic systems with degassing devices and drying devices are known from the prior art. For example, the DE 10 2016 226 283 A1 a hydraulic arrangement which comprises a degassing device for hydraulic pressure medium and a container or line section fluidly connected to the degassing device, which is set up to be at least partially filled with the hydraulic pressure medium in an operating state. An outflow device for a gas, in particular for dry compressed air, is provided in the container or line section, the outflow device being arranged in such a way that it is arranged in the pressure medium in the operating state.

Through this device, dry gas or compressed air is introduced directly into the hydraulic pressure medium so that gas bubbles are formed in the pressure medium. The many small gas bubbles have a large surface area compared to the gas volume and therefore absorb moisture from the pressure medium very quickly. Moisture contained in the pressure medium thus passes over into the gas in the gas bubbles and can be separated out in a comparatively simple manner together with the gas bubbles in a degassing device.

In addition, an arrangement in DE 102019216874.4 described, which is very compact and allows the pressure medium to actually and efficiently dry. In this arrangement, the pressure medium is degassed and / or dried in a negative pressure. This negative pressure will cause a foam to form on the surface of the pressure medium.

One problem is measuring the level of foam to prevent the container from overflowing 100 to have a handle on. This is especially an issue when you come below 400 mbar absolute pressure.

A standard swimmer would drown in the foam, ultrasound is not possible in this case, as there is a vacuum, and light / laser would shine through depending on the color of the oil.

It is therefore an object of this invention to find a solution to this problem.

SHORT VERSION

The present invention is based on the idea that a float which is hollow and uniformly round is used for detecting the level of the pressure medium in the container.

According to one embodiment of the present invention, a method for degassing and / or drying a hydraulic pressure medium is provided, the method comprising the following steps: supplying pressure medium into a container through an inlet opening of the container; Discharging the pressure medium from the container through an outlet opening of the container; Supplying gas into the container through a venting device; Discharging the gas from the container through the ventilation device, so that a negative pressure is formed in the container; The level of the pressure medium in the container during the degassing is detected by means of a float, the float being hollow and uniformly round, the diameter of the float preferably being between 35 mm and 45 mm and the weight of the float preferably between 2.5 g and 2.9 g.

According to one embodiment of the present invention, a method is provided, the position of the float in the container being detected by means of light radiation, preferably a laser.

According to one embodiment of the present invention, a method is provided, the pressure during the method being lower than 60 mbar, preferably between 40 and 50 mbar.

According to one embodiment of the present invention, a method is provided, wherein the negative pressure is achieved by means of a vacuum pump.

According to one embodiment of the present invention, a treatment arrangement for degassing and / or drying a hydraulic pressure medium is provided, the arrangement comprising: a container which is configured to receive a quantity of pressure medium; an inlet opening for the pressure medium, through which the pressure medium can be fed into the container; an outlet opening for the pressure medium, through which the pressure medium can be discharged from the container; a ventilation device configured to direct a flow of gas from and to the container and create a negative pressure in the container, the container further comprising a Comprises a float configured to enable detection of a level of the pressure medium in the container, the float being hollow and uniformly round.

According to one embodiment of the present invention, a treatment arrangement is provided, wherein the diameter of the float is between 35 mm and 45 mm.

According to one embodiment of the present invention, a treatment arrangement is provided wherein the weight of the float is between 2.5 g and 2.9 g.

According to one embodiment of the present invention, a processing arrangement is provided, the ventilation device comprising a gas delivery device, in particular a vacuum pump, which is connected to an outlet opening for the gas and which is configured to generate the negative pressure in the container.

According to one embodiment of the present invention, a processing arrangement is provided, wherein the processing arrangement further comprises a turbine which is arranged in the container, the turbine being configured such that the pressure medium which is supplied through the inlet opening into the container is passed through the turbine must flow, wherein the turbine is connected to a rotating element which is configured to transmit a rotary movement of the turbine in the pressure medium contained in the container.

According to one embodiment of the present invention, a processing arrangement is provided, the inlet opening of the pressure medium being provided with a nozzle arrangement which comprises a plurality of nozzles in order to divide the volume flow of the pressure medium and thus increase the surface area of the pressure medium.

According to one embodiment of the present invention, a processing arrangement is provided, wherein the nozzles are directed upwards, the deflection angle preferably being 15 °.

According to one embodiment of the present invention, a use of a hollow and uniformly round element as a float in a container provided with a negative pressure in which a pressure medium, preferably oil, is degassed and / or dried is provided.

According to one embodiment of the present invention, a use of a hollow and uniformly round element as a float in a container provided with a negative pressure, in which a pressure medium, preferably oil, is degassed and / or dried, is provided, the pressure in the container being lower than 60 mbar, preferably between 40 and 50 mbar.

According to one embodiment of the present invention, a method for degassing and / or drying a hydraulic pressure medium is provided. In this method, a pressure medium is fed into a container through an inlet opening of the container, the inlet opening being arranged at an upper portion of the container. In addition, a gas is fed into the container through a ventilation device, wherein a porous end portion of the ventilation device is arranged at a central lower position of the container, so that bubbles of the gas are distributed in a portion of the container filled with the pressure medium and a flow of the bubbles forms from the bottom up in the section of the container. In addition, the pressure medium is discharged from the container through an outlet opening of the container, the outlet opening being arranged on a lower section of the container below the porous end section. This method is particularly advantageous because it enables the pressure medium to be dehumidified and / or degassed efficiently in a very compact arrangement. The container is preferably more elongated to allow dehumidification to take place along the major axis of the container. By “elongated” it is meant that the container extends along a major axis and that the length of the container along this major axis is significantly greater than a length of the container measured along any other axis.

According to one embodiment of the present invention, a processing arrangement for degassing and / or drying a hydraulic pressure medium is provided, the arrangement comprising a container which is configured to receive a predetermined amount of pressure medium; wherein the arrangement comprises an inlet opening for the pressure medium which is arranged at an upper portion of the container and through which the pressure medium can be supplied into the container; wherein the arrangement comprises an outlet opening for the pressure medium, which is arranged on a lower portion of the container, and through which the pressure medium can be discharged from the container; wherein the arrangement comprises a ventilation device which is configured to supply a flow of gas into the container, wherein a porous end portion of the ventilation device is arranged at a central lower position of the container so that bubbles of the gas are distributed into a portion of the container filled with the pressure medium and a bottom-up flow of the bubbles forms in the portion of the container; wherein the outlet opening is at a lower portion of the container below the porous end portion is arranged. This arrangement is particularly advantageous because it enables the pressure medium to be dehumidified and / or degassed efficiently in a very compact arrangement. The container is preferably more elongated to allow dehumidification to take place along the major axis of the container. By “elongated” it is meant that the container extends along a major axis and that the length of the container along this major axis is significantly greater than a length of the container measured along any other axis.

According to a further embodiment of the present invention, a treatment arrangement is provided, the arrangement further comprising a first pump configured to introduce the pressure medium into the container through the inlet opening; and wherein the arrangement further comprises a second pump configured to discharge the pressure medium from the container through the outlet opening. This solution enables the supply and discharge of the pressure medium to and from the container. In addition, it is possible to achieve a desired pressure within the container.

Figure list

• 1 zeigt eine Darstellung des hydraulischen Schemas einer Aufbereitungsanordnung für das Trocknen eines hydraulischen Druckmittels gemäß einer Ausführungsform der vorliegenden Erfindung;
• 2 zeigt eine Darstellung des hydraulischen Schemas einer Aufbereitungsanordnung für das Trocknen eines hydraulischen Druckmittels gemäß einer weiteren Ausführungsform der vorliegenden Erfindung;
• 3 bis 5 zeigen verschiedene Ansichten einer erfindungsgemäßen Aufbereitungsanordnung, gemäß einer weiteren Ausführungsform der vorliegenden Erfindung;
• 6 zeigt eine Darstellung eines Behälters einer Aufbereitungsanordnung für das Trocknen eines hydraulischen Druckmittels gemäß einer weiteren Ausführungsform der vorliegenden Erfindung;
• 7 zeigt eine Darstellung des hydraulischen Schemas einer Aufbereitungsanordnung für das Trocknen eines hydraulischen Druckmittels gemäß einer weiteren Ausführungsform der vorliegenden Erfindung;
• 8 zeigt eine schematische Darstellung eines Behälters mit einer Düse für den Einlass des Druckmittels in den Behälter gemäß einer weiteren Ausführungsform der vorliegenden Erfindung;
• 9 zeigt eine 3D-Darstellung einer Düse gemäß einer weiteren Ausführungsform der vorliegenden Erfindung;
• 10 zeigt eine Schnittdarstellung der Düse von 9 gemäß einer weiteren Ausführungsform der vorliegenden Erfindung.

The present invention is described with reference to the accompanying figures, wherein like reference characters refer to like parts and / or to like parts and / or to corresponding parts of the system. To the figures:

• 1 shows a representation of the hydraulic scheme of a processing arrangement for drying a hydraulic pressure medium according to an embodiment of the present invention;
• 2 shows an illustration of the hydraulic scheme of a processing arrangement for drying a hydraulic pressure medium according to a further embodiment of the present invention;
• 3 until 5 show various views of a processing arrangement according to the invention, according to a further embodiment of the present invention;
• 6th shows an illustration of a container of a processing arrangement for drying a hydraulic pressure medium according to a further embodiment of the present invention;
• 7th shows an illustration of the hydraulic scheme of a processing arrangement for drying a hydraulic pressure medium according to a further embodiment of the present invention;
• 8th shows a schematic representation of a container with a nozzle for the inlet of the pressure medium into the container according to a further embodiment of the present invention;
• 9 Fig. 3 shows a 3-D representation of a nozzle according to a further embodiment of the present invention;
• 10 FIG. 13 shows a cross-sectional view of the nozzle of FIG 9 according to a further embodiment of the present invention.

DETAILED DESCRIPTION

In the following, the present invention will be described with reference to specific embodiments as shown in the accompanying figures. Nevertheless, the present invention is not limited to the particular embodiments described in the following detailed description and shown in the figures, but the described embodiments merely illustrate some aspects of the present invention, the scope of which is defined by the claims.

Other changes and variations of the present invention will be apparent to those skilled in the art. The present description thus includes all changes and / or variations of the present invention, the scope of which is defined by the claims.

In the present description, the term “pressure medium” means any medium that is used in industry to control hydraulic components, in particular hydraulic and lubricating oils.

In this description, the components are first presented by their arrangement and then the method is described in detail with which the individual components are used to prepare the pressure medium.

1 shows a representation of the hydraulic scheme of a processing arrangement 1000 for processing, or drying and / or degassing, a hydraulic pressure medium according to an embodiment of the present invention.

The preparation process takes place in a container 100 extending along an axis Ax1. The container 100 is cylindrical in this particular case.

The container 100 is filled with the pressure medium during the treatment process so that the moisture and / or the gas in the Pressure medium are included, can be removed from the pressure medium.

The container 100 has an inlet port 101 for the pressure medium on that at an upper portion of the container 100 is arranged and through which the pressure medium in the container 100 can be fed. The inlet opening 101 can either be on one edge of the container 100 or on the inside of the container 100 be positioned.

The container 100 furthermore has a second inlet opening 103 on that for refilling the container 100 can also be used.

The container 100 furthermore has an outlet opening 104 for the pressure medium on that at a lower portion of the container 100 is arranged and through which the pressure medium from the container 100 can be discharged. The outlet opening 104 is preferably located in the bottom of the container 100 .

The gas that is required for the treatment process is passed through a ventilation device 200 into the container 100 introduced. The ventilation device 200 includes an end portion 201 through which the gas enters the container 100 can flow in.

The end section 201 is made of porous material, preferably of porous metallic material, and can even be similar to a porous sintered filter, in particular like a pneumatic silencer made of porous sintered metal. This feature results in particularly fine bubbles and the transfer of moisture from the pressure medium into the bubbles is facilitated. Sintered filters and pneumatic mufflers are known per se and are commercially available.

Alternatively, the end section can be made from ceramic and / or from compression-molded, powdery plastics and / or from a multi-layer cloth. By means of these solutions, similar advantages can be achieved in each case.

The end section 201 is inside at a central lower position of the container 100 arranged. In particular is the distance between the bottom of the container 100 and the end section 201 the outflow device 200 along the axis Ax1 of the container 100 is measured, preferably less than 1/3 the height of the container 100 , more preferably less than 1/4 the height of the container 100 , more preferably less than 1/5 the height of the container 100 , more preferably less than 1/6 the height of the container 100 , more preferably less than 1/7 the height of the container 100 .

A tube of the ventilation device 200 , at the end of which said end section 201 is arranged is in the container 100 through a side opening 102 of the container 100 used.

The gas that is on the top portion of the container 100 collects is through an outlet port 105 from the container 100 discharged.

The following paragraphs describe the ventilation device 200 described which the supply and discharge of the gas respectively to and from the container 100 permitted.

In the embodiment shown in 1 is shown, is a closed circulation circuit between the outlet port 105 and the end section 201 arranged. By means of this closed circulation circuit, it is possible to remove all of the gas that passes through the outlet opening 105 from the container 100 is discharged, or a part thereof, through the end portion 201 back in the container 100 to introduce.

The gas flows out of the outlet opening 105 by a vacuum pump 203 driven by an engine 204 can be driven. The vacuum pump 203 pumps the gas out of the container 100 and thus reduces the pressure inside the container from atmospheric pressure. A pressure between 0.05 and 0.5 bar is preferably set. (e.g. 0.3 bar) As in 1 can be seen is a 2/2 way valve 202 between the outlet port 105 and the vacuum pump 203 arranged.

As will be described in more detail in the course of the description, the vacuum pump is at the outlet 203 a heat exchanger 205 arranged, which is preferably a countercurrent heat exchanger.

On one side of the heat exchanger 205 the gas flowing out of the vacuum pump is cooled. The gas at the exit of the heat exchanger 205 is continued by a cooling device 211 cooled down. The cooler 211 can for example be a Peltier element, a cooling circuit or another means known from the prior art. The condensed moisture of the gas can then pass through a condensate container 207 accumulated.

On the other side of the heat exchanger 205 the gas coming out of the condensate container is warmed up 207 flows so that the pressure medium in the container 100 can be dried more effectively.

Alternatively, the heat exchanger 205 between a conduit leading from the outlet port 105 to the vacuum pump 203 leads, and a conduit leading from the cooling device 211 to the porous end portion 201 be arranged so that the gas, that to the vacuum pump 203 flows, can be cooled and the gas that comes out of the cooling device 211 flows away, can be warmed up.

As in 1 can be seen, is preferably a proportionally adjustable 2/2 way valve 208 between the heat exchanger 205 and the side opening 102 of the container 100 arranged. Optionally, this valve 208 can also be designed as a proportional valve. This solution enables an automatic process adjustment, depending on the respective fluid.

The closed circulation circuit is equipped with an outlet filter 206 connected, which is configured to vent the excess air from the closed circulation circuit into the external atmosphere.

In the following paragraphs the hydraulic system 300 describes which the supply and removal of the pressure medium to and from the container 100 permitted.

The pressure medium is through the entrance 301 and preferably via a 2/2 way valve 303 by means of a first pump 308 into the hydraulic system 300 introduced.

Between the first pump 308 and the entrance 301 is preferably a heat exchanger 306 arranged, which is preferably a countercurrent heat exchanger. On one side of the heat exchanger 306 becomes the pressure medium that goes to the first pump 308 flows, warmed to a higher temperature of the pressure medium in the container 100 to get during the reprocessing order.

As will be described in more detail in the course of the description, the heat exchanger is on the other side 306 the pressure medium cooled from the container 100 flows.

Between the heat exchanger 306 and the entrance 301 is preferably a low pressure filter 305 arranged, with which the particles flowing in the pressure medium can be at least partially filtered out. In addition, they are preferably in front of the low pressure filter 305 a pressure sensor 302 and / or an aqua sensor 304 arranged.

Between the filter 306 and the first pump 308 is preferably a pressure sensor 307 arranged.

Downstream of the first pump 308 is a pressure relief valve 311 arranged, the function of which will be described in more detail in the course of the description. Between the inlet port 101 of the container 100 and the pressure relief valve 311 is preferably a high pressure filter 312 arranged, which is preferably finer than the low pressure filter 305 is.

As described above is an outlet port 104 for the pressure medium provided on a lower portion of the container 100 is arranged and through which the pressure medium from the container 100 can be discharged. In particular, the pressure medium is removed from the container 100 by means of a second pump 313 discharged.

As in 1 can be seen are the first pump 308 and the second pump 313 by the same engine 309 driven and coupled by a common shaft. It should be noted that this arrangement is not required for the aim of the present invention. The two pumps can also be driven by means of two different motors and be coupled by different types of connections.

It is beneficial to have the first pump 308 and the second pump 313 have the same nominal volume flow, so that the same amount of pressure medium in the container 100 through the inlet port 101 inserted and out of the container 100 through the outlet opening 104 can be discharged.

The motor 309 is preferably a servomotor, which is particularly light, so that the processing arrangement 1000 is easier to transport. The motor 309 is preferably frequency controlled.

Downstream of the second pump 313 three parallel flow paths are provided which can be used under different operating conditions.

A first flow path that occurs during the filling of the container 100 can be used, connects through a 2/2 way valve 315 the pressure side of the second pump 313 with the second inlet port 103 .

A second flow path that occurs during emptying of the container 100 can be used, connects through a 2/2 way valve 314 the pressure side of the second pump 313 with the pressure side of the first pump 308 .

A third flow path that occurs during normal operation of the processing arrangement 1000 can be used, connects the pressure side of the second pump 313 with an output of the processing arrangement. A tank of a unit, a hydraulic control block to be filled or some other external consumer that receives the dried and degassed pressure medium can be connected to this. This third flow path is preferably with the heat exchanger 306 connected to the pressure medium that comes from the second pump 313 flows, is cooled, and at the same time the pressure medium to the first pump 308 flows, is warmed up.

Downstream of the heat exchanger 306 is preferably a third filter 316 arranged, which is preferably finer than the low pressure filter 305 and as the high pressure filter 312 is. In addition, a preload valve blocks 317 the path to the outlet if the pressure of the pressure medium is lower than a predetermined value.

The processing order 100 can on a cart 400 be installed so that the processing arrangement 1000 can be easily transported. Such an arrangement can also be designed to be very compact.

As in the 3 until 5 is shown is a housing 1 provided in which the filter 305 , 312 and 316 and other small components of the processing arrangement 1000 on a front 1a of the housing 1 are arranged and the container 100 and the other elements of the processing arrangement 1000 on the back side 1b of the housing 1 are arranged. In addition, the electronics required to control the processing arrangement 1000 is required on an upper lid 1c of the housing 1 arranged.

With this arrangement, a very compact machine is created which is easy to transport and which is particularly easy to maintain because the interchangeable components, e.g. the filters, are easy to extract.

On the right side of the 1 is a control cabinet with a display 600 shown, the operation of the processing arrangement 1000 permitted. This display is conveniently located in the lid 1c of the housing arranged.

On the right side of the 1 is still a system 700 arranged, which allows a vacuum filling of a hydraulic control. This can be, for example, a self-sufficient hydraulic compact axis from the applicant or a hydraulic control that is intended for use under water. Such a system 700 is described in detail in the operating instructions BAL_Vo1.03, which was published in August 2015 by Bosch Rexroth GmbH in Austria, and is preferably used for compact axes. In the present invention there is advantageously a line 318 provided that the upper section of the container, which is under negative pressure during operation 100 with a vacuum connection of the system 700 through a vacuum connection 106 connects, so that no separate additional vacuum generation arrangement has to be provided.

In the following paragraphs, the process for processing, in particular drying and / or degassing, the pressure medium is described by means of the processing arrangement described above 1000 he follows.

For filling the container 100 the pressure medium is through the first pump 308 into the container 100 pumped. The valve is in this operating status 314 in a locked position and the valve 315 in an open position. With this setting, the pressure medium that is passed through the second pump 313 from the container 100 through the outlet opening 104 is discharged, back into the container 100 through the second inlet port 103 fed.

The pressure medium is through the pressure relief valve 311 warmed up. In particular, the proportionally adjustable pressure relief valve 311 controlled by hand or by means of an electrical control so that a specified temperature downstream of the pressure relief valve 311 is achieved.

When a predetermined level of pressure medium in the container 100 is reached, the actual preparation process begins. For this purpose the valve 315 switched to the blocking position so that the level of the pressure medium in the container 100 remains constant.

After this switchover, pressure medium is continuously fed through the inlet opening 101 into the container 100 fed and through the outlet port 104 from the container 100 discharged.

After the predetermined level of pressure medium in the container 100 is reached, the ventilation device is at the same time 200 switched on so that the gas is introduced into the pressure medium and the drying and degassing of the pressure medium can start.

In particular, the vacuum pump 203 turned on to allow bubbles of gas to pass through the end section 201 flow into a section of the container filled with the pressure medium 100 are distributed and a flow of the bubbles from the bottom up in the section of the container 100 forms. The vesicles collect on an upper portion of the container 100 , at the outlet opening 105 .

The many small gas bubbles have a large surface area compared to the gas volume and therefore absorb moisture from the pressure medium very quickly. Included in the pressure medium Moisture thus passes into the gas bubbles and can go to the outlet opening together with the gas bubbles 105 stream. When the gas bubbles emerge from the pressure medium, the absorbed moisture is removed from the pressure medium at the same time.

The absorption capacity of the gas bubbles is also increased by the heating of the gas, which is generated by the heat exchanger 205 takes place, increased. In addition, the partial vapor pressure of the water dissolved in the pressure medium increases, which also favors a transition into the gas phase.

In particular, the gas that comes out of the container 100 through the outlet opening 105 is discharged by the vacuum pump 203 promoted. The gas is then passed through the heat exchanger 205 cooled in a first cooling process.

At a section that is downstream of the heat exchanger 205 is arranged, the gas is in a second cooling process through the cooling device 211 continued to cool.

The moisture removed from the pressure medium by the gas bubbles condenses through these two cooling processes and this condensed moisture can enter the condensate container 207 be discharged.

The cooled, drier gas can then go through the heat exchanger again 205 be warmed up and in the container 100 are fed.

The heat of the gas coming through the vacuum pump 203 is conveyed is with the gas, which has been cooled by means of the second cooling process, through the heat exchanger 205 exchanged.

With this arrangement, temperatures of the gas can be up to 5 ° C downstream of the cooling device 211 can be achieved so that the moisture obtained can be removed more effectively from the gas and at the same time by means of the heat exchanger 205 a temperature up to 35 ° C at the end portion 201 .

While the pressure medium through the pumps 308 and 313 to and from the container 100 flows, the gas is in the container 100 through the end section 201 supplied and withdrawn again by means of negative pressure, so that the pressure medium that is in the container 100 is supplied, can be dried and / or degassed. It is therefore possible with such a system to continuously dry and degas a pressure medium.

Optionally on the hydraulic system 300 an oxygen sensor can be installed to monitor the air content of the pressure medium so that pressure medium aging can be detected. In addition, the total gas content can also be deduced from the oxygen content.

When the container 100 needs to be emptied, e.g. B. when the processing has to be ended, the valve 314 switched to the open position so that the level of the pressure medium in the container 100 can sink. This switching over is the pressure medium that comes from the first pump 308 flows through the valve 314 to the pressure side of the second pump 313 fed and thus to the exit 317 the processing order 1000 .

After the container 100 completely emptied the valve 314 switched back to the locked position, and the motor 309 that the pumps 308 , 313 drives, switched off.

In the 2 is a further embodiment of the processing arrangement according to the invention 1000 shown schematically. There are features that match those of the 1 are provided with the same reference numerals. The description is not repeated. Rather, the differences to the one in the 1 described embodiment shown.

Alternative to the ventilation device 200 , which is provided with the closed circulation circuit, can, as in 2 is shown a ventilation device 200 ' be implemented with an open circulation circuit. In this case, compressed air is taken directly from a source of compressed air 209 into the container 100 fed. Alternatively, air from the environment can also be supplied through an intake opening. Here, too, the driving force for the air flow or gas flow is the vacuum pump (reference symbol in 2 ) in the top section of the container 100 creates a negative pressure, causing air or gas over the end portion 201 is sucked up.

In this case the air is released by means of the vacuum pump 203 sucked in through a filter 210 discharged into an external atmosphere. The other components function similarly to the components used in the ventilation device 200 with a closed circulation circuit have been described in detail.

For the previously addressed case of using compressed air from the compressed air source 209 the rule is that compressed air is already very dry anyway. For example, a compressed air supply system is already available in many factory buildings to supply pneumatic consumers. The investment requirement for a separate compressed air supply can therefore often be dispensed with when using the hydraulic arrangement according to the invention.

As already mentioned, compressed air is drier than the ambient air due to its generation, which includes compression and often also subsequent cooling with the removal of condensation water. But even if the compressed air had a relative humidity of 100%, its relative humidity would decrease when it was introduced into the pressure medium in the course of decompression and volume increase. The quotient of the relative humidity values in the air is proportional to the quotient of the pressures.

So you relax on the ventilation device 200 ' the compressed air from 6 bar to 1 bar, for example, the relative humidity decreases from a maximum of 100% to 16.7%. When using a pneumatic compressed air source 17th the humidity of the compressed air is significantly lower. In addition, when the compressed air is heated, the relative humidity usually falls even further in the heated pressure medium. It can be assumed that the compressed air can absorb about 40 g of water ^{per m 3.} It is therefore possible to remove large amounts of water from the liquid pressure medium with comparatively little and inexpensively available compressed air.

6th shows a representation of a container 100 a processing arrangement for drying a hydraulic pressure medium according to a further embodiment of the present invention.

The main differences to the in 1 and 2 container shown.

In the container shown 100 there is shown a turbine assembly comprising a turbine contained in the vessel 100 is arranged. The turbine 111 is configured so that the pressure medium flowing through the inlet port 101 into the container 100 is fed through the turbine 111 must flow. This solution uses the energy of the pressure medium to move a rotating element 112 through the turbine 111 to turn. The inlet opening 101 is arranged downstream of the turbine.

The turbine 111 is on the rotating element 112 connected. The rotating element can be a fan, for example. The rotation of the turbine 111 is moved by the rotating element into the one in the container 100 Transferring pressure medium contained. This movement allows the bubbles of gas emerging from the porous end section 201 come into a section of the container filled with the pressure medium 100 be better distributed and accelerated. As a result, more efficient dewatering of the pressure medium can be carried out.

It is an additional object of this invention to control the level of pressure medium within the container 100 capture. The difficulty is that because of the negative pressure in the upper portion of the container 100 forms a foam. Under such a condition, a commercial swimmer would drown in the foam. At the same time, the use of ultrasound is not possible, because the vacuum (e.g. laser) can shine through depending on the color of the oil.

The inventor has therefore invented a special type of float which, even under such conditions, detects a level of the pressure medium inside the container 100 enables.

The swimmer 113 according to the present invention is hollow and uniformly round. The diameter of the float 113 is preferably between 35 mm and 45 mm and the weight of the swimmer is preferably between 2.5 g and 2.9 g. Such a swimmer 113 enables the level of the pressure medium in the container to be recorded with a laser and can also float up to 30 mbar on the foam. Preferably in the container by the vacuum pump 203 reached a pressure between 40 and 50 mbar.

The swimmer 113 can preferably have a diameter of 40 mm and a weight of 2.7 g. Such a shimmer can be a table tennis ball, for example. This invention therefore also describes the use of a table tennis ball for detecting a level of the pressure medium in the container 100 .

7th shows a representation of the hydraulic scheme of a processing arrangement for drying a hydraulic pressure medium according to a further embodiment of the present invention.

Since most of the characteristics are identical to the characteristics of the in the 1 and 2 are illustrated embodiment, in order to avoid redundancy, their description is not repeated. Therefore, only the essential differences are explained in detail here. For emptying the container 100 becomes the 2/2 way valve 314 ' used to lower the level of pressure medium in the container. In particular, to empty the container is the valve 314 ' brought into the open position so that the pressure medium from the first pump 313 comes, is guided against downstream of the first pump and not into the container 100 is brought. In this embodiment, the pressure medium is upstream of the heat exchanger 306 fed.

The 2/2 way valve is used to fill the container 315 ' used. In particular, the valve is used to refill the container 315 ' brought into the open position so that the pressure medium to the first pump 313 is performed, due to the negative pressure in the container 100 there, in the container 100 is brought. After the level of the pressure medium in the container has reached a desired level, the valve 315 ' closed and the motor that pumps 308 and 313 drives is switched on. In addition, the valve will 320 that is between the pressure side of the second pump 313 and 104 is arranged, used to increase the level of the pressure medium in the container during the working process.

Downstream of the second pump is a check valve 319 arranged that a positive pressure downstream of the second pump 313 drains.

The gas that is required for the treatment process is passed through a ventilation device 200 ' into the container 100 introduced the small differences to the ventilation device 200 from 1 having.

In this embodiment there is an air heat exchanger with a fan 205 ' arranged that the waste heat upstream of the vacuum pump 203 blows out.

8th shows a schematic representation of a container with a nozzle arrangement 500 for the inlet of the pressure medium into the container 100 according to a further embodiment of the present invention.

Preferably the nozzle arrangement is 500 along the axis Ax1 of the container 100 arranged so that the pressing means symmetrically in the container 100 can be brought.

9 shows a 3D representation of a nozzle arrangement 500 according to a further embodiment of the present invention;

As in 9 shown is the nozzle arrangement 500 a “multiple nozzle” or “ring nozzle” that comprises a plurality of nozzles. The aim of this nozzle arrangement 500 the volume flow is divided by the many parallel nozzles on the circumference and thus the surface area is increased. In addition, such a nozzle arrangement can enable an atomization function, even if there is only little differential pressure (but high vacuum) and help to destroy any foam bubbles that may arise.

In the embodiment, the nozzle arrangement is provided with 30 nozzles on the circumference, each with a diameter of 4 mm. The number and diameter of the nozzles can vary as desired from the embodiment shown.

10 FIG. 13 shows a cross-sectional view of the nozzle of FIG 9

The nozzles are preferably all directed slightly upwards (approx. 15 °) in order to extend the dwell time of the pressure medium. The nozzle arrangement is preferably made on 3D plastic printing.

While the present invention has been described with reference to the above-described embodiments, it will be apparent to those skilled in the art that it is possible to implement various modifications, variations, and improvements of the present invention in light of the above-described teaching and within the scope of the appended claims without departing from the scope of the invention.

Even if the container 100 has been shown in the figures with a cylindrical shape, such a shape is not required. The container 100 could also be a prism with an elliptical base and preferably two end sections 201 the ventilation device 200 each arranged at the focal points of the ellipse. In addition, the container could have any other elongate shape.

It should be noted that the present invention can differ from the illustrated embodiment. In similar embodiments, similar functions can be achieved with equivalent elements, e.g. more than one filter in place of two filters, different arrangement of parts, etc. Furthermore, the areas that would be skilled in the art are not described here in order to achieve the described invention not to obscure unnecessarily.

Accordingly, it is intended that the invention not be limited by the specific illustrative embodiments, but rather by the scope of the appended claims.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102016226283 A1 [0002]
• DE 102019216874 [0004]

Claims (13)

A method for degassing and / or drying a hydraulic pressure medium, the method comprising the following steps: Supplying pressure medium into a container (100) through an inlet opening (101) of the container (100); Discharge of the pressure medium from the container (100) through an outlet opening (104) of the container (100); Supplying gas into the container (100) through a venting device (200, 200 '); Discharging the gas from the container (100) through the ventilation device (200, 200 '), so that a negative pressure is formed in the container; wherein the level of the pressure medium in the container during the degassing is detected by means of a float (113), the float (113) being hollow and uniformly round, the diameter of the float (113) preferably being between 35 mm and 45 mm and the The weight of the float (113) is preferably between 2.5 g and 2.9 g. Procedure according to Claim 1 , the position of the float (113) in the container (100) being detected by means of light radiation, preferably a laser. Method according to one of the Claims 1 or 2 , wherein the pressure during the process for degassing and / or drying the hydraulic pressure medium is lower than 60 mbar, preferably between 40 and 50 mbar. Method according to one of the Claims 1 until 3 , the negative pressure being achieved by means of a vacuum pump 203. Treatment arrangement (1000) for degassing and / or drying a hydraulic pressure medium, the arrangement (1000) comprising: a container (100) which is configured to receive a quantity of pressure medium; an inlet opening (101) for the pressure medium, through which the pressure medium can be fed into the container (100); an outlet opening (104) for the pressure medium, through which the pressure medium can be discharged from the container (100); a ventilation device (200, 200 ') which is configured to guide a flow of gas from and to the container (100) and to create a negative pressure in the container, characterized in that the container (100) further comprises a float (113 ) configured to enable the detection of a level of the pressure medium in the container (100), the float (113) being hollow and uniformly round. Processing arrangement (1000) according to Claim 5 , the diameter of the float (113) being between 35 mm and 45 mm. Processing arrangement (1000) according to one of the Claims 5 or 6th wherein the weight of the float (113) is between 2.5 g and 2.9 g. Processing arrangement (1000) according to one of the Claims 5 until 7th , wherein the ventilation device (200, 200 ') comprises a gas delivery device, in particular a vacuum pump (203), which is connected to an outlet opening (105) for the gas and which is configured to generate the negative pressure in the container (100). Processing arrangement (1000) according to one of the Claims 5 until 8th , wherein the processing arrangement (1000) further comprises a turbine (111) which is arranged in the container (100), wherein the turbine (111) is configured in such a way that the pressure medium flowing through the inlet opening (101) into the container ( 100), through which the turbine (111) has to flow, the turbine (111) being connected to a rotating element (112) which is configured to induce a rotary movement of the turbine (111) in that contained in the container (100) Transferring pressure medium. Processing arrangement (1000) according to one of the Claims 5 until 9 , wherein the inlet opening (101) of the pressure medium is provided with a nozzle arrangement (500) which comprises a plurality of nozzles in order to divide the volume flow of the pressure medium and thus increase the surface area of the pressure medium. Processing arrangement (1000) according to one of the Claims 5 until 10 wherein the nozzles are directed towards an upper position of the container (100), the deflection angle between a horizontal plane of the container (100) and the direction of the nozzles being preferably 15 °. Use of a hollow and uniformly round element as a float (113) in a container (100) provided with a negative pressure, in which a pressure medium, preferably oil, is degassed and / or dried. Use after Claim 12 , the pressure in the container (100) being lower than 60 mbar, preferably between 40 and 50 mbar.

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