DE102019202637A1 - Sealing system and electric drive with one sealing system - Google Patents

Abstract

The invention relates to a sealing system for a bushing (1) between a contaminated area (2) and a protected area (3). The bushing (1) can be a mechanical bushing or an electrical bushing. The object of the invention is to provide a grommet which ensures a very high level of tightness and a leakage rate close to zero over its service life. According to the invention, this object is achieved by the features of claims 1 or 2.

Description

The invention relates to a sealing system for a bushing ( 1 ) between a contaminated area ( 2 ) and a protection area ( 3 ). The implementation ( 1 ) can be a mechanical leadthrough or an electrical leadthrough.

With contaminated area ( 2 ) those areas are meant that are completely or partially filled with liquid, gaseous, foggy or dusty media and not in the protected area ( 3 ) are allowed to arrive.

In a large number of applications, liquid media or gases contaminated with particles or oil mist are conveyed or conveyed. Feedthroughs are often essential here, for example to mechanically actuate a valve or to control a drive or to supply it with energy. It must be prevented that the contaminated medium passes through the bushing. Some of the media are aggressive or, due to other properties, represent a danger for drives, controls or other parts. For example, short circuits could be caused between live parts or adhesives could come off. In general, seals always have a certain leak rate. This can be very low if the ambient conditions, such as pressure and temperature, remain the same, but it increases accordingly if there are pressure and / or temperature fluctuations. Sealing systems are already known in which several sealing levels are provided. For example, several O-rings arranged one behind the other can be used. However, the leakage medium can continue to flow unhindered in the area between the sealing planes.

The object of the invention is to provide a sealing system which ensures a very high level of tightness and a leakage rate close to zero over its service life.

According to the invention, this object is achieved by the features of claims 1 or 2. It is intended that the implementation ( 1 ) a first cut-off wall ( 4th ) happens and the sealing system contains an absorbent ( 5 ) having.

A second solution provides that the implementation ( 1 ) a first cut-off wall ( 4th ), a collecting room ( 7th ), which is an absorbent ( 5 ) and a second wall ( 6th ) happens.

The first cut-off wall ( 4th ) should only allow minimal leakage. The absorbent ( 5 ) should be able to absorb the entire amount of leakage over the service life that the first sealing wall ( 4th ) happens. On the second wall ( 6th ) should in principle be dispensed with, but this prevents contaminated media from entering the protection area ( 3 ) and it can delimit a collecting space in which the absorbent is received.

Further developments of the invention are presented in more detail in the subclaims. In general, the invention aims at both electrical and mechanical feedthroughs.

The sealing system according to the invention is preferably used in the area that is completely or partially contaminated with an oil or an oil mist. Oils have the property that they migrate through interfaces over time.

The absorbent ( 5 ) can by an absorbent molded part ( 9 ) be formed. Moldings are easy to handle and assemble, but in some cases they cannot completely fill a space. The molded part can in its basic form, for. B. be pot-shaped with a recess for implementation. Then the sealing system is functional regardless of the installation position.

In order to achieve as large a volume as possible with absorbent material, even with complex geometries, a shapeless bulk material is provided as absorbent means. Another advantage of bulk material is that the bulk material particles have a large surface area.

Sponge-like materials can also be used for the absorbent ( 5 ) are provided. Sponges have large surfaces and can also be compressed and can therefore also be adapted to an enclosure to a limited extent.

Felt-like materials are also suitable as absorbers. Due to their fibrous structure, felts have a large surface and can bind correspondingly large amounts of leakage media.

Sponges, felts or other molded parts can be designed as mats and simply built into a collecting space. If required, several layers of the same mat can be used here.

Granules, powders, gels or foams, for example, are also suitable as a shapeless absorbent. The prerequisite for use is the durability and absorption capacity of the materials used.

A particularly high absorption capacity of a multiple of its own weight is possible through superabsorbents. Superabsorbents are particularly suitable for polar liquids, such as water or aqueous solutions. However, superabsorbents for oil are also already known.

A particularly easy delivery of a leakage medium to the absorber medium is possible if the implementation is completely covered by the absorber medium ( 5 ) is surrounded. The liquid is then drawn into the absorber medium ( 5 ) relocated.

The absorber medium should be accommodated in a closed space, especially if it is a shapeless absorber material, but a molded part must also be held in a suitable manner. The absorbent ( 5 ) is therefore preferably in a collecting room ( 7th ) recorded for a leakage medium. Even if the absorption capacity of the absorber materials is no longer sufficient to completely absorb the leakage medium, the collecting space can absorb further liquid.

The first cut-off wall ( 4th ) can be formed by a bushing overmolded with a plastic material. Alternatively or in addition, the first cut-off wall ( 4th ) be sealed with the help of an O-ring. The same applies to a potting, which can also be used on its own or in addition to an encapsulation.

In a further embodiment of the sealing system it is provided that the bushing is not surrounded by the absorber medium, but freely outside an absorber medium ( 5 ) running from a first cut-off wall ( 4th ) to a second wall ( 6th ) runs. So that the leakage medium is not unhindered by the first sealing wall ( 4th ) to the second wall ( 6th ), a barrier is provided. A drip area can serve as a barrier, especially a drip contour ( 15th ), e.g. B. a drip edge.

According to a variant, the drip area can also be in the form of a drip disk ( 22nd ) be executed. This can be based on the implementation ( 1 ) pressed on, welded on, soldered or glued on. In special cases, the drip disk can be made in one piece with the leadthrough.

The drip disc ( 22nd ) have a conical outer and / or inner contour, e.g. B. it can be designed as a hollow cone. This makes it possible to create a labyrinth-like sealing structure, whereby one of the second wall ( 6th ) into the collecting room ( 7th ) protruding sleeve ( 23 ) extends without contact into the hollow cone. The maximum diameter of the drip disk ( 22nd ) larger than the diameter of the labyrinth or sleeve-like wall ( 23 ) be. Such a seal fulfills its purpose in all installation positions because the contamination always comes from the first sealing wall ( 4th ) takes place. Labyrinth-like walls can, for. B. be several nested and spaced apart sleeves.

An area on the surface of the leadthrough or a coating on the leadthrough can also serve as a barrier if the surface energy of this area is increased.

Gravity can also be used as a barrier. Of course, the prerequisite is that the direction of gravity can be defined in the respective application. It is intended that the implementation ( 1 ) between the first cut-off wall ( 4th ) and the second wall ( 6th ) runs at least partially in the direction counter to gravity. This can be achieved through a special shape, whereby the leakage medium is first diverted in the direction of gravity, but would then have to move on in the opposite direction to gravity if it wanted to reach the second wall. A suitable geometry can be a V-shaped or U-shaped bushing ( 1 ) be. As already mentioned, a hollow cone-shaped barrier in combination with a sleeve is completely independent of the installation position.

Combinations of the above-mentioned designs can further increase the effect, for example the drip disc could be provided with a lotus effect coating to make it easier to drip off.

The second wall mainly serves as a means of retaining the absorber. The second wall should be at least so tight that no particles of an amorphous absorber agent can get through the second wall. In some applications with increased tightness requirements it may be necessary that the bushing ( 1 ) in the second wall with the help of a molded seal, e.g. B. an O-ring or a lip seal, by molding around the bushing ( 1 ), by potting the implementation ( 1 ) or the like against the medium of the contaminated area ( 2 ) is sealed.

Electric motors are the preferred application for the sealing system according to the invention. In particular, the sealing system serves to seal between an electric motor and electronics or a printed circuit board.

Electric motors with sealing systems can be used, for example, as oil pump motors or as drives for centrifugal separators.

• 1 eine erste Ausführungsform eines Dichtungssystems,
• 2 eine erste Variante der ersten Ausführungsform,
• 3 eine zweite Ausführungsform eines Dichtungssystems,
• 4 eine erste Variante der zweiten Ausführungsform,
• 5 eine zweite Variante der ersten Ausführungsform,
• 6 eine zweite Variante der zweiten Ausführungsform,
• 7 eine dritte Variante der ersten Ausführungsform,
• 8 eine dritte Variante der zweiten Ausführungsform,
• 9 eine vierte Variante der ersten Ausführungsform,
• 10 eine vierte Variante der zweiten Ausführungsform,
• 11 eine dritte Ausführungsform,
• 12 eine erste Variante der dritten Ausführungsform,
• 13 eine zweite Variante der dritten Ausführungsform,
• 14 eine dritte Variante der dritten Ausführungsform,
• 15 eine vierte Variante der dritten Ausführungsform und
• 16 einen elektrischer Antrieb mit eines Dichtungssystems.

Embodiments of the invention are explained in more detail below with reference to the drawing. Show it:

• 1 a first embodiment of a sealing system,
• 2 a first variant of the first embodiment,
• 3 a second embodiment of a sealing system,
• 4th a first variant of the second embodiment,
• 5 a second variant of the first embodiment,
• 6th a second variant of the second embodiment,
• 7th a third variant of the first embodiment,
• 8th a third variant of the second embodiment,
• 9 a fourth variant of the first embodiment,
• 10 a fourth variant of the second embodiment,
• 11 a third embodiment,
• 12 a first variant of the third embodiment,
• 13 a second variant of the third embodiment,
• 14th a third variant of the third embodiment,
• 15th a fourth variant of the third embodiment and
• 16 an electric drive with a sealing system.

Note: Reference symbols with an index and corresponding reference symbols without an index denote details of the same name in the drawings and the description of the drawings. This is the use in another embodiment, the prior art and / or the detail is a variant. For the sake of simplicity, the claims, the introduction to the description, the list of reference symbols and the abstract contain only reference symbols without an index.

1 shows a first embodiment of a sealing system, with a contaminated area 2 , a first cut-off wall 4th , an absorbent 5 , a second wall 6th , a protection area 3 and an implementation 1 between the contaminated area 2 and the protection area 3 , the implementation of the first sealing wall 4th , the absorbent 5 and the second wall 6th crosses. Already the first cut-off wall 4th should provide the best possible seal. But since always with a creep of a medium, z. B. oil is to be expected through interfaces, the absorbent is used 5 to absorb the largest possible amount of the leakage medium. The second wall 6th is intended to optimize the sealing effect and practically prevent contaminated media from passing through. The absorbent 5 is in a collection room 7th arranged, which here with a bed, so a shapeless material 10 , is filled with absorbent material. The implementation 1 is designed as a round pin, which creates a clean sealing surface without edges, corners or burrs. The implementation 1 is with the plastic material of the first sealing wall 4th encapsulated.

2 shows a first variant of the first embodiment, with a contaminated area 2a , a first cut-off wall 4a , an absorbent 5a , a second wall 6a , a protection area 3a and an implementation 1a between the contaminated area 2a and the protection area 3a . The first cut-off wall 4a additionally has a recording 11a to accommodate an O-ring 8a on. This should be ready for the first cut-off wall 4a Seal as well as possible. This is achieved through the elasticity of the O-ring. In this way, a reliable seal can be ensured even with thermal shock loads and different expansion coefficients of the sealing partners. The absorbent 5a is here as bulk material (formless material 10a ) in a collecting room 7a arranged and surrounds the implementation 1a fully. The implementation 1a is designed as a round pin, which creates a clean sealing surface without edges, corners or burrs.

3 shows a second variant of a sealing system, with a contaminated area 2 B , a first cut-off wall 4b , a collection room 7b , an absorbent 5b , a second wall 6b , a protection area 3b and an implementation 1b which from the contaminated area 2 B over the first cut-off wall 4b , the absorbent 5b and the second wall 6b to the protection area 3b leads. In the collecting room 7b is a molded part in this embodiment 9b , e.g. B. arranged in the form of an absorbent mat. The molding 9b is neither on the first cut-off wall 4b still on the second wall 6b over a large area. Between the molding 9b and the first cut-off wall 4b and the second wall 6b is a space 21b available. This partially increases the creepage distance for the penetrating medium between the first sealing wall 4b and the second wall 6b . The implementation 1b is designed as a round pin, which creates a clean sealing surface without edges, corners or burrs. The implementation is in the first cut-off wall 4b encapsulated with plastic material.

4th shows a first variant of the second embodiment, with a contaminated area 2c , a first cut-off wall 4c , a collection room 7c with an absorbent 5c , a second wall 6c , a protection area 3c and an implementation 1c . The first cut-off wall 4c additionally has a recording 11c to accommodate an O-ring 8c on. This should ready the first cut-off wall 4c Seal as well as possible. This is achieved through the elasticity of the O-ring. In this way, a reliable seal can be ensured even with thermal shock loads and different expansion coefficients of the sealing partners. The absorbent 5c is also here as a molded part 9c trained and located in the collecting room 7c . The molding 9c is due to the recording 11c on. Between the molding 9c and the second wall 6c is a space 21c available.

This partially increases the creepage distance for the penetrating medium between the first sealing wall 4c and the second wall 6c . The implementation 1c is designed as a round pin, which creates a clean sealing surface without edges, corners or burrs.

5 shows a second variant of the first embodiment, with a contaminated area 2d , a first cut-off wall 4d , a collection room 7d , an absorbent 5d , a second wall 6d , a protection area 3d and an implementation 1d which differs from the contaminated area 2d over the first cut-off wall 4d , the absorbent 5d and the second wall 6d to the protection area 3d extends. There is a receptacle in the first sealing wall 11d to accommodate an O-ring 8d and to accommodate a disc 12d available. The disc 12d presses the O-ring axially into the receptacle 11d and creates a tight fit of the O-ring 8d on the one hand on the first cut-off wall 4d and on the other hand on the disc 12d . The collecting room 7d is with an absorbent bulk (shapeless material 10d ) filled. The implementation 1d is designed as a round pin, which creates a clean sealing surface without edges, corners or burrs.

6th shows a second variant of the second embodiment, with a contaminated area 2e , a first cut-off wall 4e , a collection room 7e , an absorbent 5e , a second wall 6e a protection area 3e and an implementation 1e which differs from the contaminated area 2e through the first cut-off wall 4c , the absorbent 5e , the second wall 6e in the protection area 3e extends. The first cut-off wall 4e assigns a recording 11e for an O-ring 8e on which one with a washer 12e is locked. The O-ring 8e is on the one hand on the first cut-off wall 4e and on the other hand on the disc 12e on. The absorbent 5e consists of a molded part 9e and is in the collection room 7e recorded. Between the molding 9e and the first cut-off wall 4e and the second wall 6e is a space 21e present, which partially creates a creepage distance between the first sealing wall 4e and the second wall 6e is enlarged. The implementation 1e is designed as a round pin, which creates a clean sealing surface without edges, corners or burrs.

7th shows a third variant of the first embodiment, with a contaminated area 2f , a first cut-off wall 4f , a collection room 7f , an absorbent 5f , a second wall 6f and an implementation 1f away from the contaminated area 2f through the first cut-off wall 4f , the absorbent 5f and the second wall 6f to the protection area 3f extends. In the first cut-off wall 4f is a recording 11f for a lip seal 13f provided with the lip seal 13f inside the first cut-off wall 4f to the contaminated area 2f extends. This allows the implementation to be overmolded 1f through the first wall 4f be waived. The absorbent 5f is as bulk material (formless material 10f) formed by absorbent material. The implementation 1f is designed as a round pin, which creates a clean sealing surface without edges, corners or burrs.

8th shows a third variant of the second embodiment, with a contaminated area 2g , a first cut-off wall 4g , a collection room 7g , an absorbent 5g , a second wall 6g , a protection area 3g and an implementation 1g . In the first cut-off wall 4f is a recording 11g for a lip seal 13g provided with the lip seal 13g also within the first cut-off wall 4g to the contaminated area 2g extends. The absorbent 5g is as a mat-like molding 9g educated. Between the molding 9g and the first cut-off wall 4g and the second wall 6g is a space 21g available. The implementation 1g is designed as a round pin, which creates a clean sealing surface without edges, corners or burrs.

9 shows a fourth variant of the first embodiment, with a contaminated area 2h , a first cut-off wall 4h , a collection room 7h , a second wall 6h , a protection area 3h and an implementation 1h . The implementation 1h is in contrast to the 1 to 8th not designed as a round, but as a square component. The implementation 1h here is a stamped part. In the first cut-off wall 4h is a recording 11h provided in which a potting 14h is introduced. The potting 14h consists of an elastic material that fits tightly to the implementation 1h and the surrounding recording 11h and the first cut-off wall 4h hugs. The absorber medium is a bulk material (shapeless material 10h ) made of absorbent material.

10 shows a fourth variant of the second embodiment, with a contaminated area 2i , a first cut-off wall 4i , a collection room 7i , an absorbent 7i , a second wall 6i , a protection area 3i and an implementation 1i which differs from the contaminated area 2i through the first cut-off wall 4i , the absorbent 5i and the second wall to the protection area 3i extends. The implementation 1i is also designed here as an angular stamped part. In the first cut-off wall 4i is a recording 11i for a potting 14i provided, which consists of an elastic material and fits closely to the implementation 1i , the recording 11i and the first cut-off wall 4i hugs. The absorber is here as a mat-like molded part 9i educated. Between the molding 9i and the first cut-off wall 4i and the second wall 6i is a space 21i intended.

11 Figure 3 shows a third embodiment, with a contaminated area 2y , a first cut-off wall 4y , a collection room 7y , an absorbent 5y , a second wall 6y a protection area 3y and an implementation 1y which differs from the contaminated area 2y over the first cut-off wall 4y , the collecting room 7y and the second wall 6y to the protection area 3y extends. The absorbent 5y in the collecting room 7y consists of a mat-like molded part 5y . The implementation 1y does not extend through the absorber medium here 5y . The implementation 1y is within the collection area 7y with a drip area 15y Mistake. The drip area 15y consists of a coating with increased surface energy (e.g. lotus effect) than the adjacent areas of the bushing 1y . As a result, the leakage medium drips through the first sealing wall 4y wandered through, from the drip area 15y on the absorbent 5y and is held there. The absorbent 5y is here as a mat-like molding 9y educated. A bed of absorbent material can also be provided here. The implementation 1y is designed as a stamped flat contact, which is molded with plastic material in the first sealing wall.

12 shows a first variant of the third embodiment, with a contaminated area 2k , a first cut-off wall 4k , a collection room 7k , a second wall 6k , a protection area 3 , and an implementation 1k which differs from the contaminated area 2k through the first cut-off wall 4k , the collecting room 7k and the second wall 6k to the protection area 3k extends. The implementation 1k has a drip area 15k on, which is angled in a V-shape. This allows the leakage medium that passes through the first sealing wall 4k has migrated through, drain and from an absorbent medium 5k be collected, even if the surface energy is not changed. The absorbent 5k is here as a mat-like molding 9k educated. A bed of absorbent material can also be provided for this purpose. The implementation 1k is also designed here as a stamped flat contact, which is molded with plastic material in the first sealing wall.

13 shows a second variant of the third embodiment, with a contaminated area 2l , a first cut-off wall 4l , a collection room 7l , a second wall 6l , a protection area 3l and an implementation 1l which differs from the contaminated area 2l through the first cut-off wall 4l , the collecting room 7l and the second wall 6l to the protection area 3l extends. The bushing is rectangular, designed as a stamped and bent part and has a U-shaped drip area 15l on. The leakage medium collects in the drip area 15l until a drop forms which, due to its own gravity, obstructs the drop area 15l can not overcome and eventually to an absorbent 5l drips down. The absorbent 5l is designed here as a mat-like molded part. A bed of absorbent material can also be used here. The drip area 15l is made here by bending. On the first cut-off wall 4l the bushing is overmolded with plastic material.

14th shows a third variant of the third embodiment, with a contaminated area 2p , a first cut-off wall 4p , a collection room 7p , a second wall 6p , a protection area 3p and an implementation 1p which differs from the contaminated area 2p through the first cut-off wall 4p , the collecting room 7p and the second wall 6p to the protection area 3p extends. The implementation 1p is designed as a round pin and has a hollow cone-shaped drip disk 22p provided that here on performing 1p is pressed on. The drip disc 22p , in particular its outer end forms the drip area 15p . The leakage medium migrates in the direction of gravity and in most installation positions collects on a partial surface of the drip area 15p until a drop forms, which then falls onto an absorbent 5p (Molding 9p ) drips and is held there. One from the second wall 6p protruding sleeve-like wall 23p is within the collecting area around the implementation 1p arranged around and dips into the hollow cone of the drip disc 22p a. This ensures that no liquid gets into the area between the sleeve-like wall in every installation position 23p and implementation 1p can arrive.

15th shows a fourth variant of the third embodiment, with a contaminated area 2q , a first cut-off wall 4q , a collection room 7q , a second wall 6q , a protection area 3q and an implementation 1q which differs from the contaminated area 2q through the first cut-off wall 4q , the collecting room 7q and the second wall 6q to the protection area 3q extends. The implementation 1q is designed as a round pin and has a hollow cone-shaped drip disk 22q provided that here on performing 1q is pressed on. The drip disc 22q , in particular its outer end forms the drip area 15q . A bushing is shown here that is rotated by 90 ° with respect to the third variant. The leakage medium migrates in the direction of gravity and collects in an annular drip area 15q until drops 24q form, which then on an absorbent medium 5q (Molding 9q) drips and is held there. The molding 9q is cup-shaped in its basic shape. This means that the sealing system is fully functional regardless of the installation position. Also here is one from the second wall 6q protruding sleeve-like wall 23q within the collecting area around the implementation 1q arranged around and dips into the hollow cone of the drip disc 22q a.

16 shows an electric drive 20m with a sealing system. A motor housing is shown 16m , an electronics housing 17m with a plug 18m , a contaminated area 2m located in the motor housing 16m is a first cut-off wall 4m an absorbent 5 m , a second wall 6m a dry area 3m located in the electronics housing 17m located and a screw 19m with the help of which the electronics housing 17m on the motor housing 16m is attached. In the first cut-off wall 4m is a recording 11m for a lip seal 13m available. Instead of a lip seal, an O-ring could also be provided. The illustrated electric drive 20m shows a possible geometric arrangement of a contaminated area 2m , a sealing system and a protection area 3m . The electronics housing could also connect axially to the motor housing or be integrated in the motor housing. The type of seal can also be selected from one of the exemplary embodiments mentioned or from combinations of these.

List of reference symbols

1

execution

2

contaminated area

3

Protection area

4th

first cut-off wall

5

Absorbent

6th

second wall

7th

Collection room

8th

O-ring

9

Molding

10

informal material

11

admission

12

disc

13

Lip seal

14th

Potting

15th

Drip area

16

Motor housing

17th

Electronics housing

18th

plug

19th

screw

20th

Electric drive

21st

Space

22nd

Drip disc

23

sleeve-like wall

24

drops

Claims (28)

Sealing system of a bushing (1) between a contaminated area (2) and a protected area (3), characterized in that the bushing (1) passes through a first sealing wall (4) and the sealing system has an absorber (5). Sealing system of a passage (1) between a contaminated area (2) and a protected area (3), characterized in that the passage (1) has a first sealing wall (4), a collecting space (7) which contains an absorber (5) and passed a second wall (6). Sealing system according to Claim 1 or 2 , characterized in that the bushing (1) is an electrical bushing or a mechanical bushing. Sealing system according to Claim 1 , 2 or 3 , characterized in that the contaminated area (2) is completely or partially filled with a liquid and / or gaseous medium, in particular oil or an oil mist. Sealing system according to Claim 1 , 2 , 3 or 4th , characterized in that the absorber means (5) forms or has an absorbent molded part (9). Sealing system according to Claim 1 , 2 , 3 or 4th , characterized in that the absorber means (5) is a shapeless material (10), e.g. B. has a bulk material or a shapeless material (10). Sealing system according to Claim 1 , 2 , 3 , 4th or 5 , characterized in that the absorber means (5) is or has a sponge-like material. Sealing system according to Claim 1 , 2 , 3 , 4th or 5 , characterized in that the absorber means (5) is or has a felt-like material. Sealing system according to Claim 7 or 8th , characterized in that the absorbent means (5) is or has an absorbent mat. Sealing system according to Claim 6 , characterized in that the absorber means (5) is or has a granulate, powder, gel, or a foam. Sealing system according to at least one of the preceding claims, characterized in that the absorber means (5) is a super absorber. Sealing system according to at least one of the preceding claims, characterized in that the passage is completely surrounded by the absorber means (5). Sealing system according to at least one of the preceding claims, characterized in that the collecting space (7) is provided for receiving a leakage medium. Sealing system according to at least one of the preceding claims, characterized in that the first sealing wall (4) with the aid of a molded seal, e.g. B. an O-ring (8) or a lip seal (13), by molding around the bushing (1), by casting the bushing (1) or the like. Is sealed. Sealing system according to at least one of the preceding claims, characterized in that the bushing (1) has a drip contour, e.g. B. has a drip edge. Sealing system according to at least one of the preceding claims, characterized in that the leadthrough (1) carries a drip disk (22). Sealing system according to Claim 16 , characterized in that the drip disc is pressed onto the bushing (1). Sealing system according to Claim 16 or 17th , characterized in that the drip disc (22) has a conical outer and / or inner contour. Sealing system according to Claim 15 , 16 , 17th or 18th , characterized in that a labyrinth-like or sleeve-like wall (23) protrudes from the second wall (6) within the collecting space (7) and is arranged around the bushing (1). Sealing system according to Claim 16 , 17th or 18th and 19th , characterized in that the maximum diameter of the drip disk (22) is larger than the diameter of the labyrinth-like or sleeve-like wall (23). . Sealing system according to Claim 20 , characterized in that the drip disc (22) and the labyrinth-like or sleeve-like wall (23) overlap along the passage (1). Sealing system according to at least one of the preceding claims, characterized in that the passage at least partially has a region of higher surface energy than the medium. Sealing system according to at least one of the preceding claims, characterized in that the passage (1) between the first sealing wall (4) and the second wall (6) runs at least partially in the direction against gravity. Sealing system according to Claim 23 , characterized in that the passage between the first sealing wall (4) and the second wall (6) has a V-shaped or U-shaped area which is directed in the direction of gravity. Sealing system according to at least one of the Claims 2 to 24 , characterized in that the second wall with the help of a molded seal, e.g. B. an O-ring or a lip seal, by molding around the implementation (1), by encapsulating the implementation (1) or the like. Is sealed. Sealing system according to at least one of the preceding claims, characterized in that it is used to seal an electric motor. Sealing system according to at least one of the preceding claims, characterized in that it serves to seal between an electric motor and electronics or a printed circuit board. Sealing system according to Claim 26 or 27 , characterized in that the electric motor is an oil pump motor or a drive for a centrifugal separator.

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