Filter insert for a liquid separator, liquid separator and use of a filter insert in such a

Abstract

The invention relates to a filter insert (100) for installation in a housing (30), in particular in a pressure vessel of a liquid separator (200), at least comprising a hollow cylindrical separating element (10) designed to separate liquid and / or aerosol from a gas stream by means of the coalescence principle, an annular disk-shaped flange (20) arranged on the end face at a central recess (12) of the separating element (10), which can be arranged between a housing cover (32) of the housing (30) and a cylindrical housing body (34) of the housing (30), and a sealing element (50) which is directed on the end face towards a radial inner side (48) of the flange (20) and, in the intended use, arranged between the flange (20) and the housing cover (32), separates a raw side (70) of the separating element (10) from its clean side (72). seals. Furthermore, the invention relates to a liquid separator (200) and to the use of a filter insert (100) in a liquid separator (200).

Description

Technical FieldThe invention relates to a filter insert for installation in a housing, in particular in a pressure vessel of a liquid separator, and to a liquid separator and to a use of a filter insert in a liquid separator for deoiling compressed air.Prior ArtLiquid separators, for example air deoiling elements for separating oil aerosol from air, can be used, for example, for deoiling compressed air in compressed air systems which are fed by an oil-lubricated connection element, for example a compressor or a vacuum pump. Such a liquid separator has a filter insert designed for separating oil from air and a pressure container or pressure-resistant container of the connection element.The oil-laden air flows into the pressure vessel via a raw air inlet in order subsequently to flow through the filter insert, which has at least one filter element or separating element designed for separating oil from raw air, for example a main separator and a post-separator, and finally to leave the housing via the clean air outlet in the cleaned state.The filter insert functions according to the coalescence principle. The at least one hollow-cylindrical separating element is designed as a hollow-cylindrical coalescer, which aggregates the fine oil droplets into larger oil droplets which settle downward by gravity in the air-deoiling element and downstream thereof. The oil droplets which settle out are discharged via at least one drainage line or at least one drainage pipe.DE 10 2021 100 413 A1 discloses a filter insert in which the flange of the filter insert has at least one guide structure, in which at least one counter-structure of the liquid separator, which counter-structure is formed complementarily to the guide structure, can engage. The guide structure and the counter structure are designed in the manner of a key-lock principle. The guide structure of the flange is a groove-like axial elevation of the flange protruding away from the end face of the separating element. This shape of the guide structure has the effect that the supporting surface of the flange can only be arranged on the supporting region of the housing if the guide structure and the counter-structure are arranged so as to spatially fit one another, in particular if the counter-structure engages in the guide structure.Further liquid separators with filter inserts are known from US 2011 / 0 315 018 A1 and DE 10 2014 002 719 A1.Disclosure of the InventionIt is an object of the invention to provide an improved filter insert for installation in a housing, in particular in a pressure vessel of a liquid separator.Another object of the invention is to provide a liquid separator having an improved filter insert.A further object of the invention is to specify a use of an improved filter insert in a liquid separator for deoiling compressed air.The aforementioned object is achieved according to one aspect of the invention with a filter insert for installation in a housing, in particular in a pressure vessel of a liquid separator, at least comprising a hollow cylindrical separation element configured for separating liquid and / or aerosol from a gas stream by means of the coalescence principle, an annular disc-shaped flange arranged at the end face on a central recess of the separation element, which flange can be arranged between a housing cover of the housing and a cylindrical housing body of the housing, and a sealing element which is present at the end face directed towards a radial inner side of the flange and, in intended use, arranged between the flange and the housing cover, seals a raw side of the separation element against its clean side.According to a further aspect of the invention, the further object is achieved by a liquid separator at least comprising a housing, in particular a pressure container, and a filter insert arranged in the housing.According to a further aspect of the invention, the further object is achieved by using a filter insert in a liquid separator for deoiling compressed air, wherein the liquid separator is assigned to a compressed air system which is fed by an oil-lubricated connection element, for example by a compressor or by a vacuum pump.Advantageous embodiments and advantages of the invention are evident from the further claims, the description and the drawing.According to one aspect of the invention, a filter insert for installation in a housing, in particular in a pressure vessel of a liquid separator, is proposed, at least comprising a hollow cylindrical separation element configured for separating liquid and / or aerosol from a gas stream by means of the coalescence principle, an annular disc-shaped flange arranged on the end face on a central recess of the separation element, which flange can be arranged between a housing cover of the housing and a cylindrical housing body of the housing, and a sealing element which is arranged on the end face directed towards a radial inner side of the flange and, in intended use, arranged between the flange and the housing cover, seals a raw side of the separation element against the clean side thereof.The proposed filter insert represents, for example, an oil separator element in a compressor application. Such liquid separators usually have a bypass valve as a safety measure on the raw side of the liquid separator. When a critical pressure difference is reached, the bypass valve is opened. The clean side of the proposed liquid separator can be effectively sealed against the raw side by means of the sealing element arranged on the flange of the filter insert, since the sealing element is arranged radially inside the bypass valve on the filter insert. Advantageously, the sealing element in the proposed filter insert can be pre-assembled on the flange of the filter insert.The shape of the sealing element, the sealing element can be Z-shaped, for example, in longitudinal section, is designed for simple assembly without impairing the functionality of the sealing element.Advantageously, this makes it possible to dispense with expensive processing of the housing cover, in which slots, which are usually trapezoidal according to the prior art, are introduced for the attachment of O-rings as a seal.Maintenance can be carried out more easily and inexpensively, since a complicated exchange of an O-ring in the housing cover can be dispensed with. The sealing element, which is arranged on the flange of the filter insert, is exchanged with the exchange of the filter insert.The filter insert with the sealing element arranged on the flange can also be used with existing compressors which provide an O-ring seal and is thus backwards compatible.The sealing element can be formed from a fluororubber monomer (FKM), for example. Alternatively, other elastomers are also suitable as sealing element.According to the invention, the flange is formed staircase-like in longitudinal section and has at least two staircase-like steps which extend into the interior of the separating element and which each have an axially extending region and a radially extending region. The axially extending region of the radially innermost step abuts the central recess of the hollow cylindrical separating element, and the radially extending region of the radially innermost step covers an end face of the separating element. The sealing element is arranged at a step following the radially innermost step, wherein the sealing element has a radially outwardly pointing sealing lip and an adjoining annular body pointing in the axial direction. Due to the step-like configuration of the flange, both a centered mounting of the flange on the recess of the separating element and a centered mounting of the filter insert with the flange in the housing body can be carried out in a simple manner. The annular body of the sealing element gives the sealing element sufficient rigidity to make it easy to handle. The sealing lip is provided for sealing against the housing cover.According to a favorable embodiment of the filter insert, the annular body can rest on the radially extending region of the innermost step during intended use and bear radially on the inside against the axially extending region of the step following the radially innermost step. The sealing lip can thereby rest on the radially extending region of the step of the flange following the radially innermost step. The sealing element can thus be easily mounted on the flange. The annular body of the sealing element gives the sealing element sufficient rigidity to make it easy to handle. The sealing lip is provided for sealing against the housing cover when the filter insert is inserted into the housing body and the housing is closed with the housing cover.According to a favorable embodiment of the filter insert, the sealing element can be clamped or glued or injection molded to the flange in a captive manner. In this way, the sealing element can be arranged on the flange in a captive manner. As a result, the flange with the sealing element can be securely mounted on the separating element. The handling of the sealing element with the flange is also simplified.According to a favorable embodiment of the filter insert, the flange can be pressed or glued into the central recess of the separating element. In particular, the axially extending region of the innermost step of the flange and / or the radially extending region of the innermost step can be pressed or glued onto the central recess and / or the end face of the separating element. In this way, the flange with the sealing element can be arranged on the separating element in a captive manner.According to a favorable embodiment of the filter insert, the flange can have a support surface at least on its radially outer edge, which support surface is designed to be supported on an upper support region of the housing body facing the housing cover. The support surface can be associated with the radially extending region of the step following the radially innermost step. In this case, a further sealing element can be arranged on the supporting surface of the flange in such a way that, in intended use, it is arranged between the flange and the housing of the liquid separator and seals the housing from the ambient pressure. This ensures reliable operation of the liquid separator even at higher fluid pressures.According to a favorable embodiment of the filter insert, the further sealing element can have a circumferential sealing body radially projecting beyond an outer edge of the flange, on which a sealing element extension extending in the axial direction is arranged. In this case, the sealing element extension can engage, when used as intended, in a groove arranged circumferentially in a sealing surface of the housing body. This ensures reliable operation of the liquid separator even at higher fluid pressures.According to a favorable embodiment of the filter insert, the further sealing element can be clamped or glued or injection molded on the outer edge of the flange in a captive manner. In this way, the further sealing element can be reliably attached to its provided sealing position in a simple manner together with the insertion of the filter insert into the housing body.According to a further aspect of the invention, a liquid separator is proposed, at least comprising a housing, in particular a pressure container, and a filter insert arranged in the housing.The proposed liquid separator represents, for example, an oil separator in a compressor application. Such liquid separators usually have a bypass valve as a safety measure on the raw side of the liquid separator. When a critical pressure difference is reached, the bypass valve is opened. The clean side of the proposed liquid separator can be effectively sealed against the raw side by means of the sealing element arranged on the flange of the filter insert, since the sealing element is arranged radially inside the bypass valve on the filter insert.According to a favorable embodiment of the liquid separator, the support surface of the flange can be braced between the housing cover and the housing body in the closed state of the housing. The housing body can have at least one flange recess configured to receive the support surface. The radius of the flange can be smaller than the radius of the housing such that the housing cover rests directly on the housing body at a radially outer region adjoining the flange recess. This ensures reliable operation of the liquid separator even at higher fluid pressures.According to a favorable embodiment of the liquid separator, a sealing surface of the housing body can have a circumferential groove for receiving the sealing element extension of the further sealing element. In this way, the sealing element extension can be positioned reliably for a favorable sealing effect and can fulfil its additional sealing function in a suitable manner.According to a further aspect of the invention, a use of a filter insert in a liquid separator for deoiling compressed air is proposed, wherein the liquid separator is assigned to a compressed air system which is fed by an oil-lubricated connection element, for example by a compressor or by a vacuum pump.Brief Description of the DrawingsFurther advantages are evident from the following description of the drawings. Exemplary embodiments of the invention are illustrated in the drawings. The drawings, specification and claims contain numerous features in combination. The skilled person will expediently also consider the features individually and summarize them to form meaningful further combinations.The following are shown by way of example: FIG. 1 is a longitudinal section of a filter insert according to an embodiment of the invention; FIG. 2 is an isometric view of the filter cartridge of FIG. 1; FIG. 3 shows a longitudinal section of a liquid separator with a filter insert according to an exemplary embodiment of the invention; FIG. 4 is a sectional isometric view of the liquid separator according to FIG. 3 ; FIG. 5 shows a detailed view of a longitudinally cut filter insert according to an exemplary embodiment of the invention with a sealing element; FIG. 6 shows a detailed view of a longitudinally cut filter insert according to a further exemplary embodiment of the invention with a further sealing element; FIG. 7 is a cross-section through a sealing element of a flange of the filter insert according to an embodiment of the invention; FIG. 8 shows a detailed view of a longitudinally cut liquid separator with a filter insert according to an exemplary embodiment of the invention; FIG. 9 shows a detailed view of a longitudinally cut liquid separator with the filter insert according to a further exemplary embodiment of the invention; and FIG. 10 shows a detailed view of a longitudinally cut liquid separator with a filter insert according to a further exemplary embodiment of the invention.Embodiments of the InventionIn the figures, identical or similar components are denoted by identical reference numerals. The figures merely show examples and should not be understood as limiting.FIG. 1 shows a longitudinal section of a filter insert 100 according to an exemplary embodiment of the invention, while FIG. 2 shows an isometric view of the filter insert 100. FIG. 3 shows a longitudinal section of a liquid separator 200 with a filter insert 100 according to an exemplary embodiment of the invention, while FIG. 4 shows a sectioned isometric view of the liquid separator 200.The filter insert 100 in the liquid separator 200 serves, for example, for deoiling compressed air. The liquid separator 200 can be assigned to a compressed air system which is fed by an oil-lubricated connection element, for example by a compressor or by a vacuum pump.The filter insert 100 comprises a hollow cylindrical separation element 10 configured for separating liquid and / or aerosol from a gas stream by means of the coalescence principle, and an annular disc-shaped flange 20 arranged on the end face at a central recess 12 of the separation element 10, which flange is arranged between the housing cover 32 and the cylindrical housing body 34 when the filter insert 100 is used as intended in the liquid separator 200.The filter insert 100 is closed off at an end of the separating element 10 opposite the end face 14 by an end plate 16. The end plate 16 is curved and forms a liquid collection region 18 in its interior. The liquid collection region 18 serves to receive the liquid separated by the separating element 10, in particular separated oil.The filter insert 100 is designed rotationally symmetrically with an axis of symmetry 80. The housing 30 of the liquid separator 200 can likewise be designed rotationally symmetrically, except for add-on parts and gas feed 74 and gas discharge 76.The gas flow with the liquid to be separated and / or the aerosol enters through the gas feed 74 into the raw region of the housing 30 of the liquid separator 200 on the raw side 70 of the separating element 10 and flows through the separating element 10 into the clean region of the housing 30 on the clean side 72 of the separating element 10. A possible liquid level in the liquid collection region 18 is indicated as a dashed line.The cleaned gas exits from the housing 30 again through the recess 12 of the separating element 10 and the gas discharge 76 in the housing cover 32. The housing body 34 has a liquid collection volume 78, in particular an oil collection volume or an oil collection volume, for collecting liquid, in particular oil, separated by pre-separation, in particular by gravity and / or by centrifugal force in the case of tangential inflow of the raw air into the housing body 34. A possible liquid level in the liquid collection volume 78 is indicated as a dashed line.A sealing element 50 is present on the end face 14 directed toward the radial inner side 48 of the flange 20. The sealing element 50 is arranged between the flange 20 and the housing cover 32 and thus seals the raw side 70 of the separating element 10 from the clean side 72 when the housing 30 is closed.At the radially outer edge 23, the flange 20 has a further sealing element 60. When the housing 30 is closed, the further sealing element 60 is arranged between the flange 20 and the housing 30 of the liquid separator 200 and seals the housing 30 from the ambient pressure.The housing cover 32 has at least one opening 42 for the use of a bypass valve (not shown). For the passage of the gas flow during a blowing off through the bypass valve, the flange 20 has corresponding flange openings 44 which are arranged in a grouped manner distributed on the circumference of the flange 20. Since the sealing lip 54 of the sealing element 50 is arranged radially inside the opening 42 for the bypass valve, the sealing element 50 can be used to seal the raw side 70 effectively with respect to the clean side 72.FIG. 5 shows a detailed view of a longitudinally cut filter insert 100 according to an exemplary embodiment of the invention with a sealing element 50.The sealing element 50 is present at the end face directed toward the radial inner side 48 of the flange 20. When the filter insert 100 is arranged as intended in the liquid separator 200, the sealing element 50 is arranged between the flange 20 and the housing cover 32 and thus seals the raw side 70 of the separating element 10 against its clean side 72 when the housing 30 is closed.As can be seen in the detailed view in FIG. 5, the flange 20 is formed staircase-like in longitudinal section and has at least two staircase-like steps 24, 25 extending into the interior of the separating element 10, each with an axially extending region 26, 28 and a radially extending region 27, 29.The axially extending region 26 of the radially innermost step 24 abuts the central recess 12 of the hollow cylindrical separating element 10. The radially extending region 27 of the radially innermost step 24 covers the end face 14 of the separating element 10.The sealing element 50 is arranged on the step 25 following the radially innermost step 24. The sealing element 50 has a radially outwardly pointing sealing lip 54 and an adjoining annular body 52 pointing in the axial direction.The annular body 52 rests in the intended use on the radially extending region 27 of the innermost step 24 and rests with its outer side 53 radially on the inside on the axially extending region 28 of the step 25 following the radially innermost step 24. The sealing lip 54 rests on the radially extending region 29 of the step 25 of the flange 20 following the radially innermost step 24.The flange 20 is connected to the separating element 10 in a captive manner and can be pressed or adhesively bonded, for example, into the central recess 12 of the separating element 10. In particular, the axially extending region 26 of the innermost step 24 of the flange 20 and / or the radially extending region 27 of the innermost step 24 can be pressed or glued onto the central recess 12 and / or the end face 14 of the separating element 10.FIG. 6 shows a detailed view of a longitudinally cut filter insert 100 according to a further exemplary embodiment of the invention with a further sealing element 60.The flange 20 of the filter insert 100 shown in FIG. 6 is designed like the flange 20 of the exemplary embodiment shown in FIG. 5. In addition to the sealing element 50, however, a further sealing element 60 is arranged on the flange 20, which serves to seal the housing 30 of the liquid separator 200 from the environment.The further sealing element 60 has a circumferential sealing body 62 radially projecting beyond the outer edge 23 of the flange 20, on which a sealing element extension 64 extending in the axial direction is arranged.In the longitudinal section shown in FIG. 6, a flange opening 44 can be seen in the support surface 22 directed toward the outer edge 23, which serves for the passage of the gas flow during a blowing off through a bypass valve from the raw region of the housing 30 on the raw side 70 of the separating element 10.FIG. 7 shows a cross section through the sealing element 50 of the flange 20, the sealing element 50 being of annular design and having a central opening 56.The sealing element 50 can be clamped or glued or injection molded to the flange 20 in a captive manner, for example.FIG. 8 shows a detailed view of a longitudinally cut liquid separator 200 with a filter insert 100 according to an exemplary embodiment of the invention.In the detailed view, the housing 30 of the liquid separator 200, for example a pressure container, with the housing body 34 and the housing cover 32 can be partially seen. A filter insert 100 is mounted in the housing 30, even only partially visible.The housing cover 32 has an opening 42 for the use of a bypass valve (not shown). For the passage of the gas flow during a blowing off through the bypass valve, the flange 20 has a flange opening 44. Since the sealing lip 54 of the sealing element 50 is arranged radially inside the opening 42 for the bypass valve, the sealing element 50 can be used to seal the raw side 70 effectively with respect to the clean side 72.Furthermore, the flange 20 has a support surface 22 on its radially outer edge 23, which is supported on an upper support region of the housing body 34 facing the housing cover 32 during the mounting of the filter insert 100. The support surface 22 is assigned to the radially extending region 29 of the step 25 following the radially innermost step 24 and represents an extension of the radially extending region 29.The support surface 22 of the flange 20 is braced between the housing cover 32 and the housing body 34 in the closed state of the housing 30. The housing body 34 has a flange recess 46 configured to receive the support surface 22. The radius of the flange 20 is also smaller than the radius of the housing 30, so that the housing cover 32 rests directly on the housing body 34 with the sealing surface 36 at a radially outer region adjoining the flange recess 46.FIG. 9 shows a detailed view of a longitudinally cut liquid separator 200 with the filter insert according to a further exemplary embodiment of the invention.The difference from the exemplary embodiment shown in FIG. 8 is that the housing cover 32 has a circumferential groove 40, which according to the prior art can be provided for an O-ring seal between filter insert 100 and housing cover 32, but is no longer necessary in the proposed filter insert 100 with sealing element 50 arranged on the flange 20. The sealing lip 54 of the sealing element 50 can advantageously also seal against such a housing cover 32, since the sealing lip 54 advantageously bridges the groove 40.FIG. 10 shows a detailed view of a longitudinally cut liquid separator 200 with a filter insert 100 according to a further exemplary embodiment of the invention.In this embodiment, a further sealing element 60 is arranged on the support surface 22 of the flange 20. When the housing 30 is closed, the further sealing element 60 is arranged between the flange 20 and the housing 30 of the liquid separator 200 and seals the housing 30 from the ambient pressure.The further sealing element 60 has a circumferential sealing body 62 radially projecting beyond the outer edge 23 of the flange 20, on which a sealing element extension 64 extending in the axial direction is arranged.The sealing surface 36 of the housing body 34 has a circumferential groove 38 for receiving the sealing element extension 64 of the further sealing element 60. The sealing element extension 64 engages in the groove 38 when the filter insert 100 is mounted. The further sealing element 60 is thus pressed between the housing body 34 and the housing cover 32 when the housing is closed. The sealing element extension 64 is pressed into the groove 38. In this way, the interior of the housing 30 is securely sealed from the environment.The further sealing element 60 can be secured against loss at the outer edge 23 of the flange 20, for example, clamped or glued or injection molded.Reference numerals denote reference numerals10 Separating element 12 Recess 14 End face 16 End disk 18 Liquid collecting region 20 Flange 22 Supporting surface 23 Edge 24 Radially inner step 25 Radially outer step 26 Axially extending region of the radially innermost step 27 Radially extending region of the radially innermost step 28 Axially extending region of the radially following step 29 Radially extending region of the radially following step 30 Housing 32 Housing cover 34 Housing body 36 Sealing surface 38 Groove 40 Groove 42 Opening for bypass valve 44 Flange opening 46 Flange recess 48 Radial inner side 50 Sealing element 52 Annular body 53 Outer side 54 Sealing lip 56 Opening 60 Further sealing element 62 Sealing body 64 Sealing element extension 70 Raw side 72 Clean side 74 Raw air inlet 76 Clean air outlet 78 Liquid collecting volume 80 Axis of symmetry 100 Filter insert 200 Liquid separator

Claims

Filter insert (100) for installation in a housing (30), in particular in a pressure vessel of a liquid separator (200), at least comprising a hollow cylindrical separation element (10) configured for separating liquid and / or aerosol from a gas stream by means of the coalescence principle, an annular disc-shaped flange (20) arranged on the end face on a central recess (12) of the separation element (10) and arrangeable between a housing cover (32) of the housing (30) and a cylindrical housing body (34) of the housing (30), and a sealing element (50) which is present on the end face directed towards a radial inner side (48) of the flange (20) and arranged between the flange (20) and the housing cover (32) in the intended use, seals a raw side (70) of the separation element (10) against its clean side (72), wherein the flange (20) is formed staircase-like in longitudinal section and has at least two staircase-like steps (24, 25) extending into the interior of the separating element (10), each with an axially extending region (26, 28) and a radially extending region (27, 29), wherein the axially extending region (26) of the radially innermost step (24) abuts the central recess (12) of the hollow cylindrical separating element (10), and the radially extending region (27) of the radially innermost step (24) covers an end face (14) of the separating element (10), and wherein the sealing element (50) is arranged on a step (25) following the radially innermost step (24), wherein the sealing element (50) has a radially outwardly pointing sealing lip (54) and an adjoining annular body (52) pointing in the axial direction.Filter insert according to claim 1, wherein the annular body (52) rests in the intended use on the radially extending region (27) of the innermost step (24) and rests radially on the inside on the axially extending region (28) of the step (25) following the radially innermost step (24), and wherein the sealing lip (54) rests on the radially extending region (29) of the step (25) of the flange (20) following the radially innermost step (24).Filter insert according to one of the preceding claims, wherein the sealing element (50) is clamped or glued or injection-molded to the flange (20) in a captive manner.Filter insert according to one of the preceding claims, wherein the flange (20) is pressed or glued into the central recess (12) of the separating element (10), in particular wherein the axially extending region (26) of the innermost step (24) of the flange (20) and / or the radially extending region (27) of the innermost step (24) are pressed or glued into the central recess (12) and / or the end face (14) of the separating element (10).Filter insert according to one of the preceding claims, wherein the flange (20) has, at least on its radially outer edge (23), a supporting surface (22) which is designed to be supported on an upper supporting region of the housing body (34) facing the housing cover (32), wherein the supporting surface (22) is assigned to the radially extending region (29) of the step (25) following the radially innermost step (24), wherein a further sealing element (60) is arranged on the supporting surface (22) of the flange (20) in such a way that, in intended use, it is arranged between the flange (20) and the housing (30) of the liquid separator (200) and seals the housing (30) with respect to the ambient pressure.Filter insert according to claim 5, wherein the further sealing element (60) has a circumferential sealing body (62) which radially projects beyond an outer edge (23) of the flange (20) and on which a sealing element extension (64) extending in the axial direction is arranged, wherein the sealing element extension (64) engages, when used as intended, in a groove (38) arranged circumferentially in a sealing surface (36) of the housing body (34).Filter insert according to claim 6, wherein the further sealing element (60) is clamped or glued or injection-molded on the outer edge (23) of the flange (20) in a captive manner.Liquid separator (200) at least comprising a housing (30), in particular a pressure vessel, and a filter insert (100) according to one of the preceding claims arranged in the housing (30).Liquid separator according to claim 8, wherein the support surface (22) of the flange (20) is braced between the housing cover (32) and the housing body (34) in the closed state of the housing (30), wherein the housing body (34) has at least one flange recess (46) formed to receive the support surface (22), and wherein the radius of the flange (20) is smaller than the radius of the housing (30) such that the housing cover (32) rests directly on the housing body (34) at a radially outer region adjoining the flange recess (46).Liquid separator according to claim 8 or 9, wherein a sealing surface (36) of the housing body (34) has a circumferential groove (38) for receiving the sealing element extension (64) of the further sealing element (60).Use of a filter insert (100) according to one of Claims 1 to 7 in a liquid separator (200) according to one of Claims 8 to 10 for deoiling compressed air, wherein the liquid separator (200) is assigned to a compressed air system which is fed by an oil-lubricated connection element, for example by a compressor or by a vacuum pump.

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