Liquid separator for a compressor system and a compressor system equipped with such a liquid separator

Abstract

The present invention relates to a liquid separation device (20) for a compressor system (1), comprising at least one coarse separation unit (21) having at least one coarse separator (21a) and a liquid removal device (21b), at least one fine separation unit (22) having at least one fine separator (22a) and a liquid removal device (22b), and at least one liquid removal passage (21c, 22c) for leading liquid from each of the liquid removal devices (21b, 22b), wherein the at least one liquid removal passage (21c, 22c) is formed within the liquid separation device (20).

Description

[Technical field]

[0001] The present invention relates to a liquid separation device for a compressor system and to a compressor system equipped with such a liquid separation device.

[0002] Oil-lubricated compressors, such as oil-lubricated screw compressors, can ensure that the oil used for lubrication and cooling is separated after the compression process via a suitable oil separator, so that it is not carried over into the downstream compressed air system. The separated oil is then fed back into the compressor, for example the screw block of an oil-lubricated screw compressor.

[0003] In the configurations known from the current state of the art of such compressor systems, in oil-lubricated screw compressors, the compressed oil-air volume flow impinges on a coalescing filter, on the clean side of which the separated oil is sucked in via a pressure gradient to an injection point provided in the screw block. The oil separator in this case forms an integral part of the compressor housing and is directly installed in it. The return to the screw block takes place via an external return line, which must be guided around the periphery of the compressor housing. This external return line not only requires corresponding structural space, but also has to be removed during maintenance.

[0004] In order to prevent oil from returning to the coalescer filter when the compressor is shut off, a check valve is arranged in the return line. Furthermore, in order to limit the air losses of the compressor, an additional nozzle must be installed in the return line, since on the clean side of the coalescer filter there is mainly air and only a small amount of oil in relation to the air. By arranging the check valve and the nozzle in the external return line, they are exposed to the corresponding ambient temperature, which creates a risk of freezing of the check valve and / or the nozzle, for example in cold weather.

[0005] Furthermore, the suction of the oil on the clean air side of the coalescer filter must be realized via an additional riser pipe, which creates the risk of a continuous air leakage flow, and furthermore leaves residual oil quantities below the inlet pipe that can be carried into the compressed air system.

[0006] In view of the above, it is therefore an object of the present invention to provide a liquid separating device which is improved over the prior art, in particular with regard to an inexpensive and process-reliable liquid return with as few losses as possible.

[0007] This problem is solved by the subject matter of the independent claims. Advantageous refinements are set forth in the dependent claims.

[0008] According to the present invention, a liquid separation device for a compressor system includes at least one coarse separation unit having at least one coarse separator and a liquid take-off device, at least one fine separation unit having at least one fine separator and a liquid take-off device, and at least one liquid take-off passage for conducting liquid from each liquid take-off device, the at least one liquid take-off passage being formed in the liquid separation device.

[0009] A liquid separator serves to separate liquid from the liquid-gas volume flow of a compressor system. For example, a liquid separator arranged downstream in the volume flow direction of an oil-lubricated compressor, such as an oil-lubricated screw compressor, can separate oil from the oil-air volume flow.

[0010] In such a case, the liquid separator is an oil separator, which separates oil from the compressed air, but alternatively, it is also possible to separate another liquid, which serves for example to cool and / or lubricate the compressor. Similarly, a gas other than air can be compressed by the compressor.

[0011] The liquid separation device is configured as a multi-stage liquid separation device, which comprises at least one coarse separation unit and one fine separation unit, i.e. comprises at least two stages. The multi-stage configuration of the liquid separation device can, for example, increase the degree of separation. Likewise, the multi-stage configuration has a positive effect on the service life of the individually used separators, in particular the service life of the fine separator.

[0012] As a coarse separator, for example, an impact metal sheet can be used in the coarse separation unit, to which the liquid-gas volume stream introduced into the coarse separation unit is initially directed at a relatively high velocity. Another embodiment of the coarse separator is, for example, a cyclone separator or a mesh, for example a wire mesh. The liquid-gas volume stream from which the liquid has already been separated in the coarse separation unit is then led further to the fine separation unit. The fine separation unit has, for example, a coalescer filter as a fine separator. At the outlet side of the liquid-gas volume stream of the coalescer filter, the liquid is separated again. However, the coarse and fine separation units do not necessarily have to be differentiated by the type of coarse and fine separator, respectively, in the context of a multi-stage separation. For example, a multi-stage separation can also have several separation units of identical or at least similar construction, in which case the term coarse separation unit refers to the fact that in this configuration, the liquid-gas volume stream contains a larger amount of liquid than in the fine separation unit. That is, the separation units run in series, with the proportion of the liquid amount in the liquid-gas volumetric stream decreasing successively, ie from the coarse separation unit to the fine separation unit.

[0013] In both the coarse separation unit and in the fine separation unit at least one liquid removal device is provided, which is arranged in a dripping direction with respect to the respective separator for collecting the separated liquid.

[0014] For the discharge of the liquid collected in the respective liquid discharge device, at least one liquid discharge passage is provided, which extends from the respective liquid discharge device in at least a first discharge direction. This first discharge direction can be directed downwards, for example in the direction of gravity, so that the liquid can be initially discharged on the basis of gravity. The further extension of the respective liquid discharge passage can then deviate from the first discharge direction. The at least one liquid discharge passage can be formed as a return passage for returning the separated liquid to a liquid reservoir for further use and / or processing. Furthermore, for example, the separated oil can be fed again to a screw block of an oil-lubricated screw compressor.

[0015] At least one liquid outlet passage is formed in the liquid separating device, so that the liquid is guided in the liquid separating device. The internal liquid guide allows a compact design, since external liquid lines can therefore be dispensed with, at least in the region of the liquid separating device. The at least one liquid outlet passage is also protected from external influences by the liquid separating device. In this respect, components arranged in the at least one liquid outlet passage, such as backflow prevention devices and / or nozzles, as described below, can also be protected, for example to prevent freezing. Furthermore, the effort required during maintenance can be reduced, since there are no or only a few external lines that have to be removed prior to maintenance.

[0016] In one arrangement, at least one liquid removal passage is defined by a casing of the liquid separation device.

[0017] The at least one liquid outlet passage can therefore be formed directly during the manufacture of the casing of the liquid separating device, for example, the at least one liquid outlet passage can be taken into account during the manufacture of the casing of the liquid separating device as a cast part, alternatively or additionally, the at least one liquid outlet passage can be formed by a hole.

[0018] Alternatively or additionally, it is also possible for at least a given section of the at least one liquid take-off passage in the liquid separation device to be formed by at least one separate liquid take-off passage line.

[0019] In one configuration, at least one liquid extraction passage is formed such that the at least one liquid extraction passage has at least two passage portions, at least one of the at least two passage portions being fluidly connected to a liquid extraction device of the coarse separation unit and at least one other passage portion being fluidly connected to a liquid extraction device of the fine separation unit.

[0020] With this configuration, the separated liquids from the coarse separation unit and the fine separation unit are combined in one liquid outlet passage through these passage parts.

[0021] Alternatively, the liquid separation device has at least two liquid outlet passages, at least one of which is fluidly connected to the liquid outlet device of the coarse separation unit and at least one other of which is fluidly connected to the liquid outlet device of the fine separation unit.

[0022] Thus, a separate liquid withdrawal passage is provided for each of the coarse and fine separation units.

[0023] In a particularly advantageous configuration, at least one backflow prevention device is arranged in each of the at least two passage parts or in each of the at least two liquid outlet passages, the backflow prevention device being configured to prevent backflow from the at least two passage parts or the at least two liquid passages into the liquid outlet device connected to these passage parts or these liquid passages, respectively.

[0024] The backflow prevention device can be configured, for example, as a check valve.

[0025] In one refinement, at least one backflow prevention device is arranged in each of the at least two passage parts or in each of the at least two liquid removal passages, the backflow prevention device being associated with one of the at least two passage parts or one of the at least two liquid removal passages having a different reaction behavior than a backflow prevention device being associated with another of the at least two passage parts or another of the at least two liquid removal passages.

[0026] For example, different pressure conditions may occur in the coarse separation unit and in the fine separation unit. By using at least one backflow prevention device in the liquid take-off passage or passage section that can be associated with the liquid take-off device of the coarse separation unit and the liquid take-off device of the fine separation unit, respectively, the corresponding backflow prevention device can be adapted to the respective pressure conditions that occur. Alternatively, the respective backflow prevention devices of the coarse separation unit and the fine separation unit, for example the corresponding check valves, can be designed identically. This reduces the number of different components to be installed and the risk of incorrect installation.

[0027] In one configuration, at least one nozzle is disposed within the at least one liquid outlet passage or is formed at least in a predetermined section by the liquid passage.

[0028] Via at least one liquid outlet passage, not only the separated liquid but also gas can possibly be discharged from the respective separation unit, resulting in corresponding gas losses and thus a decrease in the efficiency of the compressor system. The nozzle allows the liquid volume flow or liquid-gas volume flow, which potentially still contains gas, to be throttled, so that the gas losses can be reduced. This applies in particular to the liquid outlet passage or passage section leading away from the liquid outlet device of the fine separation unit, since only a small amount of liquid is separated in this passage or passage section in comparison with the gas.

[0029] The nozzle can be inserted as a separate component into the at least one liquid outlet passage. Alternatively or additionally, the cross section of the at least one liquid passage can be adapted, at least in a certain section, in such a way that a corresponding throttling is performed via such section. The nozzle or nozzle function is thus formed directly via the at least one liquid outlet passage.

[0030] In a particularly advantageous configuration, at least one nozzle is arranged in each of the at least two passage parts or in each of the at least two liquid outlet passages, as described above, with a nozzle which can be associated with one of the at least two passage parts or one of the at least two liquid outlet passages having a different cross section than a nozzle which can be associated with another of the at least two passage parts or another of the at least two liquid outlet passages.

[0031] Equally advantageous to the use of at least one backflow prevention device in the liquid removal passages or passage sections which can be respectively assigned to the coarse and fine separation units is that different pressure conditions in the coarse and fine separation units can be taken into account via the correspondingly assigned nozzles, in other words the respective nozzles can be adapted to the pressure conditions occurring.

[0032] When using at least one backflow prevention device and at least one nozzle in the liquid outlet passage or passage section, the backflow prevention device is preferably arranged upstream of the nozzle in the liquid outlet direction, in particular the at least one backflow prevention device is arranged in the vicinity of the liquid outlet device which can be associated with it.

[0033] In one configuration, the backflow prevention device and / or nozzle are configured to be threadably inserted into the at least one liquid outlet passage.

[0034] This allows the backflow prevention device and / or the nozzle to be easily and reliably assembled in the at least one liquid outlet passage, which further allows for easy replacement, for example in the event of a breakdown or in connection with a change in properties.

[0035] Overall, the above-mentioned arrangement or configuration of the respective backflow prevention devices and / or nozzles allows a reliable and simple integration of the backflow prevention devices and / or nozzles into at least one liquid removal passage. Furthermore, the respective separation units with different pressure levels can be reliably aspirated. By using the respective backflow prevention devices and / or nozzles for the coarse and fine separation units, carry-over of liquid from the coarse separation unit, for example in the bypass and thus in the clean side of the fine separator, can be prevented or at least reduced.

[0036] In one configuration, the backflow prevention device and the nozzle for each separation unit are formed by one common flow control device, in particular by one common flow control element.

[0037] The flow control device can be formed as a pre-assembled group, which has the backflow prevention device and the nozzle as individual components. In this case, for example, the distance between the backflow prevention device and the nozzle can be preset and checked in the pre-assembled group. Furthermore, individual assembly, possibly with testing, can be omitted, which reduces the assembly effort. However, the flow control device can also have a common flow control element or be formed as a flow control element in which the functions of the backflow prevention device and the nozzle form a common component. The backflow prevention device can therefore be formed integrally with the nozzle in the flow control element.

[0038] In one configuration, at least one liquid removal device of the coarse separation unit and / or at least one liquid removal device of the fine separation unit are arranged below the respective associated separator, in particular in the flow calming region of the respective separation unit, in the installed state according to the use of the liquid separation device.

[0039] In other words, at least one liquid take-off device of the coarse separation unit and / or at least one liquid take-off device of the fine separation unit are arranged in the respective separation units such that the liquids separated in the respective separators drip or flow directly into the respective liquid take-off device, so that at least the liquids separated in the respective separators can be prevented from collecting in places where they cannot be discharged.

[0040] Furthermore, by arranging at least one liquid removal device of the coarse separation unit and / or at least one liquid removal device of the fine separation unit in the flow calming area of ​​each separation unit, oil entrainment by the air flow can be avoided.

[0041] In one configuration, at least one liquid removal device of the coarse separation unit and / or at least one liquid removal device of the fine separation unit has a liquid outlet to at least one liquid removal passage, which liquid outlet is located at the deepest point of the at least one liquid removal device of the coarse separation unit and / or at least one liquid removal device of the fine separation unit in an assembled state in accordance with use of the liquid separation device.

[0042] The suction of the separated liquid is therefore performed at the deepest point of at least one liquid take-off device of the respective separation unit. A riser pipe can therefore be omitted. This increases the process reliability during maintenance, since this precludes distortion of the riser pipe, for example due to a collision with another tool. The absence of a riser pipe also reduces the risk of injuries, since the riser pipe is usually geometrically pointed. Furthermore, efficiency is increased, since the longest possible situation in which air is simply sucked in as soon as the oil level falls below the lower edge of the suction can be prevented.

[0043] Furthermore, the separated liquid can be completely aspirated, thus avoiding carryover of liquid into other system areas.

[0044] In one configuration, at least one liquid take-off device of the coarse separation unit and / or at least one liquid take-off device of the fine separation unit is formed as a removable cover for attachment to a casing of the liquid separation device.

[0045] Thus, for example, at least one liquid take-off device of the coarse separation unit and / or at least one liquid take-off device of the fine separation unit can be simply removed for maintenance purposes and for corresponding accessibility to the coarse separation unit and / or the fine separation unit without the need to previously remove the return lines. Since the liquid take-off passages are formed by the casing of the liquid separation device adjacent to the respective liquid take-off devices, no separate bridge needs to be considered when removing the respective covers. The respective covers can, for example, be screwed or screwed into the casing and / or can be removably attached to or in the casing in a form-locking and / or force-locking manner. The connection of the liquid outflow from the cover thus passes directly into the liquid take-off passage of the casing of the liquid separation device, so that removal of the cover disconnects the liquid return and reconnects it when the cover is reassembled.

[0046] In order to ensure overlap of the respective liquid outlets of each cover with the respectively corresponding liquid passages, the assembly end position may be defined, for example, by screwing the cover onto the stopper, by a corresponding hole pattern or by matching markings on the cover and the casing.

[0047] However, for a fluid-tight seal between the cover, essentially the liquid take-up device or the liquid outlet, and the respective liquid take-up passage, a seal, for example an O-ring, may be arranged in the liquid outlet and / or in the liquid take-up passage facing the liquid outlet, which seals the area between the liquid outlet and the liquid take-up passage fluid-tight, and correspondingly prevents leakage.

[0048] In one configuration, at least one liquid outlet passage is formed as a branching or annular conduit.

[0049] The branching lines can be easily realized via holes and allow short paths. Alternatively, the at least one liquid take-off passage can be formed as an annular line, for example to bridge another path. However, the at least one liquid take-off passage can also consist of a branching line section, an annular line section and possibly further line sections of different configurations.

[0050] According to another aspect, the invention relates to a compressor system comprising a compressor and a liquid separator as described above, the liquid separator being arranged outside the casing of the compressor.

[0051] The liquid separation device is therefore an external liquid separation device with respect to the compressor. It therefore has its own external casing, in which at least one liquid removal passage is integrated. The return of the liquid from each separation unit back to the compressor or to another outlet target is therefore effected via at least one liquid removal passage inside the casing of the liquid removal device. The at least one liquid removal passage is in particular formed by the casing wall.

[0052] In one configuration, provision is made for the casing of the compressor to be adjacent to the casing of the liquid separation device, in particular the at least one liquid take-off passage being adjacent to the suction passage of the compressor.

[0053] As a result, the outlet of at least one liquid take-off passage can be connected directly to the corresponding inlet of the compressor, without the need for a separate external line for this purpose. Alternatively, due to the spatial proximity of the liquid separator to the compressor, the section from the casing of the liquid separator to the casing of the compressor can be bridged by a very short return line. This increases the compactness of the compressor and reduces the number of components, thereby reducing the maintenance effort. Furthermore, separate protective measures for the external piping can be omitted or reduced in number.

[0054] Features described in the above description of the liquid separation apparatus are equally applicable to the compressor system. Similarly, unless stated otherwise, features described for the compressor system in relation to the liquid separation apparatus are equally applicable to the liquid separation apparatus.

[0055] According to another aspect, the invention relates to a rail vehicle equipped with a liquid separation device as described above and / or with a compressor system as described above.

[0056] The liquid separator or compressor system allows a low-loss, inexpensive and process-reliable liquid return that works reliably even in the demanding applications in rail vehicles. Furthermore, the demand for high availability in rail vehicles is supported by increased ease of maintenance.

[0057] The features described in the above description of the liquid separation device and compressor system are equally applicable to rail vehicles. Similarly, unless otherwise stated, the features described for rail vehicles with respect to the liquid separation device and compressor system are equally applicable to the features of the liquid separation device and compressor system.

[0058] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. [Brief description of the drawings]

[0059] [Figure 1] FIG. 1 is a schematic diagram illustrating an exemplary embodiment of a compressor system according to the present invention.

[0060] FIG. 1 is a schematic diagram showing an exemplary embodiment of a compressor system 1 according to the present invention. The compressor system 1 comprises a compressor 10 with a casing 10a and a liquid separator 20 with a casing 20a. The casing 10a of the compressor is directly adjacent to the casing 20a of the liquid separator 20. In this configuration, the compressor system 1 can also be referred to as a compressor system with a compressor and an external liquid separator. In an exemplary embodiment, the compressor 10 is an oil-lubricated screw compressor for forming compressed air. Correspondingly, in this embodiment, the liquid separator 20 is an oil separator. In alternative embodiments, the medium to be compressed may be a gas different from air and the liquid is not limited to oil for lubrication and / or cooling.

[0061] The liquid separation device 20 includes a coarse separation unit 21 with a coarse separator 21a and a fine separation unit 22 with a fine separator 22a. For example, in this embodiment, the coarse separator 21a is configured as an impact metal sheet, and the fine separator 22a is configured as a coalescer filter. In this embodiment, liquid take-out devices 21b, 22b are respectively arranged in the separation units 21, 22 below the respective separators 21a, 22a in the dripping direction of the separated liquid. In the dripping direction, liquid take-out passages 21c, 22c extend from the deepest points of the liquid take-out device 21b of the coarse separation unit 21 and the liquid take-out device 22b of the fine separation unit 22. The liquid take-out passage 21c of the coarse separation unit 21 leads out the separated liquid collected in the liquid take-out device 21b of the coarse separation unit 21, so that this liquid can be provided to the compressor 10 again. This is also done for the fine separation unit 22 via the liquid take-off passage 22c of the fine separation unit 22. The collection and discharge of the separated liquids are respectively carried out in the flow calming area, so that the already collected liquid is prevented from being entrained by the flow in the respective separation unit 21, 22. The respective liquid take-off devices 21b, 22b are formed as covers of the respective separation units 21, 22 in this embodiment, which covers are removably attached to the casing 20a. For maintenance purposes, the respective connections can be released. The respective liquid outlets of the liquid take-off devices 21b, 22b are directly adjacent to the respective liquid take-off passages 21c, 22c formed in the casing 20a, so that the respective separation units 21, 22 can be opened without removing separate bridge lines.

[0062] At the end facing the liquid take-off device 21b, the liquid take-off channel 21c of the rough separation unit 21 has a check valve 21d as a backflow prevention device. The check valve 21b prevents liquid from flowing back from the liquid take-off channel 21c into the liquid take-off device 21b. Further downstream from the liquid take-off device 21b, a nozzle 21e is further arranged in the liquid take-off channel 21c. The nozzle 21e makes it possible to throttle the liquid or liquid-gas volume flow, which may still contain gas, and thus to reduce gas losses. The liquid take-off channel 21c is formed in the present embodiment directly in the casing 20a of the liquid separation device 20. In the present embodiment, this is achieved by the construction of a corresponding cast-in part as the casing 20a. Furthermore, the configuration of the liquid outlet passage 21c in the region of the check valve 21d and the nozzle 21e has a threaded section, so that the check valve 21d and the nozzle 21e can be screwed into the liquid outlet passage 21c. Further downstream of the nozzle 21e, the separated liquid is again fed directly to the compressor 10, here the screw block of the screw compressor, via another section (not shown) of the liquid outlet passage 21c. The return takes place within the casing 10a, 20a, so that a separate external line can be omitted.

[0063] The configuration of the liquid outlet passage 22c of the fine separation unit or the arrangement of the check valve 22d as a backflow prevention device and the nozzle 22e for throttling are the same as the above-mentioned configuration for the liquid outlet passage 21c of the rough separation unit 21. However, different pressure levels occur in the rough separation unit 21 and the fine separation unit 22, and these different pressure levels cause different pressure conditions when the separated liquid is sucked from the respective liquid outlet devices 21b, 22b through the respective liquid outlet passages 21c, 22c, so the respective check valves 21d, 22d and nozzles 21e, 22e are different from each other. In other words, the check valve 21d and the nozzle 21e associated with the rough separation unit 21 are adapted to the pressure level occurring in the rough separation unit 21 and the resulting pressure condition. Conversely, the check valve 22d and the nozzle 22e associated with the fine separation unit 22 are adapted to the pressure level occurring in the fine separation unit 22 and the resulting pressure condition.

[0064] During operation of the compressor system 1, in this embodiment for an oil-lubricated screw compressor as compressor 10, a compressed oil-air volumetric flow, indicated by a black arrow in FIG. 1, is introduced into the coarse separation unit 21. In the coarse separation unit 21, the compressed oil-air volumetric flow impinges on an impingement metal sheet as coarse separator 21a, whereby a first part of the oil is separated from the oil-air volumetric flow in the coarse separator 21a and drips into the liquid take-off device 21b located below. The oil collected in the liquid take-off device 21b of the coarse separation unit 21 is sucked out through the liquid take-off passage 21c of the coarse separation unit 21 via a check valve 21d arranged in the liquid take-off passage 21c and a nozzle 21e also arranged in the liquid take-off passage 21c, and is fed back to the screw block of the compressor 10.

[0065] The compressed oil-air volume stream, from which a portion of the oil has already been separated in the coarse separation unit 21, then flows from the coarse separation unit 21 to the fine separation unit 22. In the fine separation unit 22, the compressed oil-air volume stream is passed through a fine separator 22a, whereby the oil is again separated and collected in a liquid take-off device 22b of the fine separation unit 22. As with the suction of oil from the coarse separation unit 21, in the fine separation unit 22, the separated oil is also suctioned and returned to the screw block of the compressor 10 by the liquid take-off passage 22c of the fine separation unit 22 via a check valve 22d arranged in the liquid take-off passage 22c and a nozzle 22e also arranged in the liquid take-off passage 22c.

[0066] The liquid outlet passages 22c of the fine separation unit 22 and the liquid outlet passages 21c of the coarse separation unit 21 still merge in the casing 20a of the liquid separation device 20 into one common liquid outlet passage (not shown) in the exemplary embodiment, so that the respectively aspirated oil can be fed to the screw block of the compressor 10 via the common liquid outlet passage. In an alternative embodiment, the liquid outlet passages 22c of the fine separation unit 22 and the liquid outlet passages 21c of the coarse separation unit 21 can also be guided separately in the casing 20a of the liquid separation device 20, so that they can open into one common liquid outlet passage only in the casing 10a of the compressor or can be guided to respective separate inlets into the screw block of the compressor 10.

[0067] The invention is not limited to the described embodiments, and in particular the features described with respect to the embodiments of the invention, the separately described configurations and the improvements of the invention can be combined with each other, unless they are reasonably mutually exclusive. [Explanation of symbols]

[0068] 1 Compressor System 10 Compressor 10a Casing (compressor) 20 Liquid separator 20a Casing (liquid separator) 21 Rough Separation Unit 21a Crude separator 21b Liquid removal device (rough separation unit) 21c Liquid extraction passage (rough separation unit) 21d Check valve (rough separation unit; backflow prevention device) 21e Nozzle (rough separation unit) 22 Microseparation unit 22a Fine separator 22b Liquid extraction device (fine separation unit) 22c Liquid extraction passage (fine separation unit) 22d Check valve (fine separation unit; backflow prevention device) 22e Nozzle (fine separation unit)

Claims

1. A liquid separation device (20) for a compressor system (1), comprising: At least one coarse separation unit (21) having at least one coarse separator (21a) and a liquid take-off device (21b); At least one fine separation unit (22) having at least one fine separator (22a) and a liquid take-off device (22b); at least one liquid outlet passage (21c, 22c) for leading liquid out of each of said liquid outlet devices (21b, 22b); having A liquid separation device (20), wherein the at least one liquid removal passage (21c, 22c) is formed within the liquid separation device (20).

2. The liquid separation device (20) of claim 1, wherein the at least one liquid removal passage (21c, 22c) is formed by a casing (20a) of the liquid separation device (20).

3. the at least one liquid removal passage (21c, 22c) has at least two passage parts, at least one of which is fluidly connected to the liquid removal device (21b) of the coarse separation unit (21) and at least one other passage part is fluidly connected to the liquid removal device (22b) of the fine separation unit (22); or 3. The liquid separation device (20) according to claim 1 or 2, wherein the liquid separation device (20) has at least two liquid outlet passages (21c, 22c), at least one of which (21c) is fluidly connected to the liquid outlet device (21b) of the coarse separation unit (21) and at least one other of which (22c) is fluidly connected to the liquid outlet device (22b) of the fine separation unit (22).

4. At least one backflow prevention device (21d, 22d) is arranged in each of the at least two passage parts or in each of the at least two liquid removal passages (21c, 22c); and The liquid separation device (20) of claim 3, wherein the backflow prevention device (21d, 22d) is configured to prevent backflow from the at least two passage sections or the at least two liquid passages (21c, 22c) into the liquid removal device (21b, 22b) connected to the passage sections or the liquid passages, respectively.

5. At least one backflow prevention device (21d, 22d) is arranged in each of the at least two passage parts or in each of the at least two liquid extraction passages (21c, 22c); and The liquid separation device (20) of claim 4, wherein the backflow prevention device (21d, 22d) that can be associated with one of the at least two passage portions or one of the at least two liquid extraction passages (21c, 22c) has a different reaction behavior than the backflow prevention device (21d, 22d) that can be associated with another of the at least two passage portions or another of the at least two liquid extraction passages (21c, 22c).

6. 6. A liquid separating device (20) according to claim 1, wherein at least one nozzle (21e, 22e) is arranged in the at least one liquid outlet passage (21c, 22c) or the at least one nozzle (21e, 22e) is formed at least in a predetermined portion by the liquid passage (21c, 22c).

7. At least one nozzle (21e, 22e) is arranged in each of the at least two passage parts or in each of the at least two liquid outlet passages (21c, 22c) according to claim 3, and 7. The liquid separating device (20) of claim 6, wherein the nozzle (21e, 22e) that can be associated with one of the at least two passage portions or one of the at least two liquid extraction passages (21c, 22c) has a different cross-section than a nozzle (21e, 22e) that can be associated with another of the at least two passage portions or another of the at least two liquid extraction passages (21c, 22c).

8. 8. The liquid separating device (20) according to any one of claims 4 to 7, wherein the backflow prevention device (21d, 22d) and / or the nozzle (21e, 22e) are screwable into the at least one liquid outlet passage (21c, 22c).

9. The liquid separating device (20) according to any one of claims 4 to 8, wherein the backflow prevention device (21d, 22d) according to any one of claims 4, 5 or 8 and the nozzle (21e, 22e) are formed by one common flow control device, in particular by one common flow control element.

10. 10. A liquid separation device (20) according to any one of claims 1 to 9, wherein the at least one liquid removal device (21b) of the coarse separation unit (21) and / or the at least one liquid removal device (22b) of the fine separation unit (22) are arranged below the respective associated separators (21a, 22a), in particular in the flow calming region of the respective separation unit (21, 22), in an installed state according to the use of the liquid separation device (20).

11. 11. A liquid separation device (20) according to any one of claims 1 to 10, wherein the at least one liquid removal device (21b) of the coarse separation unit (21) and / or the at least one liquid removal device (22b) of the fine separation unit (22) have a liquid outlet to the at least one liquid removal passage (21c, 22c), which liquid outlet is located at the deepest point of the at least one liquid removal device (21b) of the coarse separation unit (21) and / or the at least one liquid removal device (22b) of the fine separation unit (22) in an assembled state in accordance with the use of the liquid separation device (20).

12. 12. A liquid separation device (20) according to any one of claims 1 to 11, wherein the at least one liquid removal device (21b) of the coarse separation unit (21) and / or the at least one liquid removal device (22b) of the fine separation unit (22) are formed as removable covers for attachment to the casing (20a) of the liquid separation device (20).

13. 13. The liquid separator (20) according to claim 1, wherein the at least one liquid take-off passage (21c, 22c) is configured as a branch line or as an annular line.

14. A compressor system (1), comprising: A compressor (10); A liquid separating device (20) according to any one of claims 1 to 13, It has The compressor system (1), wherein the liquid separation device (20) is arranged outside a casing (10a) of the compressor (10).

15. 15. The compressor system (1) of claim 14, wherein the casing (10a) of the compressor (10) is adjacent to the casing (20a) of the liquid separation device (20), in particular the at least one liquid removal passage (21c, 22c) is adjacent to a suction passage of the compressor (10).

16. A rail vehicle equipped with a liquid separation device (20) according to any one of claims 1 to 13 and / or a compressor system (1) according to claim 14 or 15.

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