DE102023116761A1 - Method for producing a separating plate for an aerosol rotary separator - Google Patents

Abstract

The invention relates to a method for producing a separating plate (10) for an aerosol rotary separator (100), comprising the step of: injection molding a plate body (12) of the separating plate (10) which has a conical basic shape and which has at least one particle guide surface (18) on at least one plate side (14) for guiding aerosol particles to be separated, wherein a mold (200) is used during injection molding which has a surface-machined mold inner surface (206a) which predetermines the surface structure (24) of the particle guide surface (18) and which is essentially free of circumferential grooves (218) extending in the circumferential direction or deviating by up to 60 degrees from the circumferential direction and having a groove depth of more than 2 µm.

Description

The invention relates to a method for producing a separating plate for an aerosol rotary separator, comprising the step of: injection molding a plate body of the separating plate having a conical basic shape, which has at least one particle guide surface on at least one plate side for guiding aerosol particles to be separated.

Furthermore, the invention relates to a molding tool for an injection molding machine for injection molding a plate body of a separating plate having a conical basic shape, which has at least one particle guide surface on at least one plate side for guiding aerosol particles to be separated.

Furthermore, the invention relates to a separating plate for an aerosol rotary separator, with a plate body which is injection-molded by means of a molding tool and has a conical basic shape, which has at least one particle guide surface on one side of the plate for guiding aerosol particles to be separated.

Furthermore, the invention relates to a plate pack for an aerosol rotary separator, with several separating plates stacked on top of each other.

The invention further relates to an aerosol rotary separator, in particular a disc separator, for a ventilation device of a crankcase of an internal combustion engine, with a separator housing and a separator rotor which is rotatably mounted in the separator housing and which comprises a plurality of separator plates stacked on top of one another in the longitudinal direction of the rotor, wherein the separator housing comprises a raw gas inlet for the gas contaminated with solid and/or liquid aerosol particles and a clean gas outlet for the gas cleaned of aerosol particles.

Aerosol rotary separators with separating plates are used, for example, to separate oil mist in crankcase ventilation. Aerosol rotary separators can differ considerably in terms of design and function from separators for separating particles from a liquid. From the publication EP 2 704 840 B1 Such a separator is known, which is intended to reduce the backmixing of solid particles and liquid on the separating plates.

During crankcase ventilation, the soot particle load of the oil mist to be separated can cause the separator plates to become sooted. This can lead to the gaps between the separator plates becoming clogged with soot particles or agglomerated particle clusters. This is also referred to as sooting.

Sooting is promoted by grooves extending in the circumferential direction in a particle guide surface of the separator divider, since the soot particles adhere to the grooves extending in the circumferential direction. The grooves extending in the circumferential direction on the separator plates arise because a mold is used during injection molding which has a non-surface-machined inner mold surface that determines the surface structure of the particle guide surface and in which there are still clear turning grooves from the mold-giving, chip-removing manufacturing process of the mold.

As a result of the sooting, the flow channel between the separator plates becomes smaller and the differential pressure across the separator rotor increases. Such an increase in the differential pressure is undesirable for many applications. Due to the increased differential pressure, it can happen in particular that the gas laden with particles passes the gap seal between the separator rotor and the separator housing and the oil particles are no longer separated.

For a smooth operation of an aerosol rotary separator, the spaces between the separating plates must be as free as possible for the gas laden with particles to flow through.

The object underlying the invention is therefore to prevent or at least reduce the deposits of aerosol particles on the particle guide surface of the separation plates.

The object is achieved by a method for producing a separating plate of the type mentioned at the outset, wherein a mold is used during injection molding which has a surface-machined inner mold surface which predetermines the surface structure of the particle guide surface and which is essentially free of circumferential grooves extending in the circumferential direction or deviating by up to 60° from the circumferential direction and having a groove depth of more than 2 µm.

Preferably, the surface-treated inner mold surface defining the surface structure of the particle guide surface is completely free of circumferential grooves extending in the circumferential direction or deviating by up to 60° from the circumferential direction with a groove depth of more than 2 µm. However, it is possible that For example, for manufacturing reasons, circumferential grooves extending in the circumferential direction or deviating by up to 60° from the circumferential direction with a groove depth of more than 2 µm cannot be completely avoided. For the purposes of the invention, essentially free of circumferential grooves extending in the circumferential direction or deviating by up to 60° from the circumferential direction with a groove depth of more than 2 µm means that fewer than 20 grooves per mm are crossed in the radial direction. Preferably, the surface-machined inner mold surface defining the surface structure of the particle guide surface has, in the radial direction, fewer than 10 circumferential grooves extending in the circumferential direction or deviating by up to 60° from the circumferential direction with a groove depth of more than 2 µm per mm, particularly preferably, in the radial direction, fewer than one circumferential groove extending in the circumferential direction or deviating by up to 60° from the circumferential direction with a groove depth of more than 2 µm per mm.

The presented understanding of a surface that is essentially free of circumferential grooves extending in the circumferential direction or deviating by up to 60° from the circumferential direction is also applied to all following descriptions, regardless of the groove depth.

The inventors have recognized that in the case of circumferential grooves extending at an angle of up to 60° from the circumferential direction, particles adhere to a disadvantageous extent. In the case of grooves extending over 60° from the circumferential direction, the centrifugal force acting on the particles adhering to the rotating plates overcomes the adhesion resistance and the particles are carried away in the radial direction and/or in the direction of the grooves. The larger the angle beyond 60° up to 90°, the more reliably the particles are carried away.

Preferably, the inner mold surface of the mold used for injection molding the plate body, which predetermines the surface structure of the particle guide surface, is essentially free of circumferential grooves extending in the circumferential direction or deviating by up to 60 degrees from the circumferential direction and having a groove depth of more than 1.5 µm. Particularly preferably, the inner mold surface of the mold used for injection molding the plate body, which predetermines the surface structure of the particle guide surface, is essentially free of circumferential grooves extending in the circumferential direction or deviating by up to 60 degrees from the circumferential direction and having a groove depth of more than 1 µm. In particular, the inner mold surface of the mold used for injection molding the plate body, which predetermines the surface structure of the particle guide surface, is essentially free of circumferential grooves extending in the circumferential direction or deviating by up to 60 degrees from the circumferential direction and having a groove depth of more than 0.5 µm.

The inner surface of the mold used in the injection molding of the plate body, which defines the surface structure of the particle guide surface, preferably has a conical basic shape and/or can be segmented. For example, the inner surface of the mold used in the injection molding of the plate body, which defines the surface structure of the particle guide surface, has several surface segments which are separated from one another by web recesses, via which spacing webs of the separating plate are produced.

The surface-treated inner surface of the mold creates a surface structure on the particle guide surface that can prevent or at least reduce and/or delay sooting. The deposition of aerosol particles on the particle guide surface of the separating plate is thus prevented or at least reduced and/or delayed.

The aerosol rotary separator preferably separates liquid and/or solid aerosol particles from a gas. For example, the aerosol rotary separator is designed to separate liquid oil particles from a crankcase ventilation gas of an internal combustion engine.

The mold can comprise several mold parts, for example two mold parts designed as mold halves. The surface-machined mold inner surface that defines the surface structure of the particle guide surface can be circumferential and/or ring-shaped. The particle guide surface can be the plate inner side of the plate body. The mold inner surface that defines the surface structure on the plate outer side of the mold used in injection molding the plate body can also be surface-machined and have the same surface properties as the mold inner surface that defines the surface structure of the particle guide surface. Alternatively, the mold inner surface that defines the surface structure on the plate outer side of the mold used in injection molding the plate body can have an unmachined surface. The method can comprise machining and/or treating the mold inner surface that defines the surface structure of the particle guide surface of the mold used in injection molding the plate body.

In a preferred embodiment of the method according to the invention, the inner mold surface of the mold used for injection molding of the plate body, which determines the surface structure of the particle guide surface, is a smoothed surface. The inner mold surface of the mold used for injection molding of the plate body, which determines the surface structure of the particle guide surface, can be a smoothed surface. The smoothed and/or smoothed inner mold surface creates a smooth particle guide surface, which reduces the frictional resistance for the aerosol particles. The smoothed and/or smoothed inner mold surface has a reduced surface roughness at least in the circumferential direction and/or at least in the radial direction, so that the particle guide surface also has a reduced surface roughness at least in the circumferential direction and/or at least in the radial direction. The smoothed and/or smoothed surface can have been created by material removal and/or rounding and/or material application. The method may comprise smoothing and/or smoothing the inner mold surface of the mold used in the injection molding of the plate body, which determines the surface structure of the particle guide surface.

In another preferred embodiment of the method according to the invention, the inner mold surface of the mold used in injection molding the plate body, which defines the surface structure of the particle guide surface, is a ground and/or brushed and/or polished surface. By polishing and/or grinding and/or brushing, the number and/or the extent of grooves in the inner mold surface of the mold used in injection molding the plate body, which defines the surface structure of the particle guide surface, can be reduced. The polished and/or ground and/or brushed inner mold surface creates a smooth particle guide surface, which reduces the frictional resistance for the aerosol particles. The method can comprise polishing and/or brushing and/or grinding the inner mold surface of the mold used in injection molding the plate body, which defines the surface structure of the particle guide surface. The polished surface can be a brush-polished surface. During polishing, the surface of the inner surface of the mold used for injection molding the plate body, which determines the surface structure of the particle guide surface, is processed with a polishing agent and a polishing tool. Polishing can be done using a line polish. If a line polish is created, peaks and valleys regularly occur, with the peaks in particular leading to a roughness that influences the process, which also influences demolding, but also the adhesion of residues. These rough peaks are preferably rounded. The rough peaks can be rounded using diamond paste, which is preferably worked in in the direction of the grooves rather than rotating. Grinding and/or brushing and/or polishing is preferably done in a radial direction or at an angle of up to 30°, preferably at an angle of up to 10° deviating from the radial direction.

Alternatively or additionally, the inner mold surface of the mold used in injection molding the plate body, which defines the surface structure of the particle guide surface, can be a coated surface. The coated surface can be a painted surface. Coating can reduce the number and/or severity of grooves in the inner mold surface of the mold used in injection molding the plate body, which defines the surface structure of the particle guide surface. The method can include coating, for example painting, the inner mold surface of the mold used in injection molding the plate body, which defines the surface structure of the particle guide surface.

In a further preferred embodiment of the method according to the invention, the inner mold surface of the mold used in injection molding the plate body, which determines the surface structure of the particle guide surface, is made from a raw surface produced by chip removal to form material removal grooves, wherein the number and/or shape of the material removal grooves of the surface-machined inner mold surface is reduced in comparison to the raw surface. Chip removal can be carried out, for example, by turning. The material removal grooves can extend in the circumferential direction or deviate by up to 60° from the circumferential direction. The material removal grooves can be turning grooves. The turning grooves preferably extend in the circumferential direction or deviate by up to 60° from the circumferential direction. Chip removal can be carried out by milling. The material removal grooves can be milling grooves. The method may comprise reducing the number and/or severity of material removal grooves in the inner mold surface of the mold used in the injection molding of the plate body, which determines the surface structure of the particle guide surface, by means of surface treatment.

The method according to the invention is further advantageously further developed in that the inner surface of the mold, which determines the surface structure of the particle guide surface, of the Plate body has a maximum roughness depth of less than 2 µm and/or a mean roughness value of less than 0.8 µm in the radial measuring direction. Preferably, the inner mold surface of the mold used for injection molding the plate body, which predetermines the surface structure of the particle guide surface, has a maximum roughness depth of less than 1.5 µm and/or a mean roughness value of less than 0.5 µm in the radial measuring direction. Particularly preferably, the inner mold surface of the mold used for injection molding the plate body, which predetermines the surface structure of the particle guide surface, has a maximum roughness depth of less than 1 µm and/or a mean roughness value of less than 0.3 µm in the radial measuring direction. In particular, the inner surface of the mold used in the injection molding of the plate body, which defines the surface structure of the particle guide surface, has a maximum roughness depth of less than 0.5 µm and/or a mean roughness value of less than 0.1 µm in the radial measuring direction.

In another preferred embodiment of the method according to the invention, the inner mold surface of the mold used in the injection molding of the plate body, which defines the surface structure of the particle guide surface, has particle guide grooves extending in the radial direction and/or in a direction deviating by up to 30°, in particular by up to 10°, from the radial direction. The particle guide grooves can be straight, curved or curved. In particular, the inner mold surface of the mold used in the injection molding of the plate body, which defines the surface structure of the particle guide surface, has a maximum roughness depth of at least 1 µm or a mean roughness value of at least 0.2 µm, preferably of at least 0.5 µm, in the circumferential direction. In particular, the inner mold surface of the mold used in the injection molding of the plate body, which defines the surface structure of the particle guide surface, has particle guide grooves with a groove depth of at least 0.5 µm extending in the radial direction and/or in a direction deviating by up to 30°, in particular by up to 10°, from the radial direction.

The object underlying the invention is further achieved by a mold of the type mentioned at the outset, wherein the mold according to the invention has a surface-machined inner mold surface that defines the surface structure of the particle guide surface. The inner mold surface that defines the surface structure of the particle guide surface is preferably smoothed and/or polished and/or ground and/or brushed. The inner mold surface that defines the surface structure of the particle guide surface can have a maximum roughness depth of less than 2 µm in the radial measurement direction. Alternatively or additionally, the inner mold surface that defines the surface structure of the particle guide surface can have a mean roughness value of less than 0.8 µm and/or be essentially free of circumferential grooves that extend in the circumferential direction or deviate by up to 60° from the circumferential direction and have a groove depth of more than 2 µm. The inner surface of the mold defining the surface structure of the particle guide surface can have particle guide grooves extending in the radial direction and/or in a direction deviating by up to 30°, in particular up to 10°, from the radial direction. The mold is preferably produced in a process in which the inner surface of the mold defining the surface structure of the particle guide surface is surface-machined, in particular smoothed and/or polished and/or ground and/or brushed.

The object underlying the invention is further achieved by a separating plate of the type mentioned at the outset, wherein the particle guide surface of the separating plate according to the invention has a maximum roughness depth of less than 2 µm and/or a mean roughness value of less than 0.8 µm in the radial measuring direction and/or is essentially free of circumferential grooves extending in the circumferential direction or deviating by up to 60° from the circumferential direction with a groove depth of more than 2 µm.

The particle guide surface preferably has a maximum roughness depth of less than 1.5 µm and/or a mean roughness value of less than 0.5 µm in the radial measuring direction. The particle guide surface is preferably designed to be substantially free of circumferential grooves extending in the circumferential direction or deviating by up to 60° from the circumferential direction with a groove depth of more than 1.5 µm. The particle guide surface particularly preferably has a maximum roughness depth of less than 1 µm and/or a mean roughness value of less than 0.3 µm in the radial measuring direction. The particle guide surface is particularly preferably designed to be substantially free of circumferential grooves extending in the circumferential direction or deviating by up to 60° from the circumferential direction with a groove depth of more than 1 µm. In particular, the particle guide surface has a maximum roughness depth of less than 0.5 µm and/or a mean roughness value of less than 0.1 µm in the radial measuring direction. In particular, the particle guide surface is essentially free of circumferential grooves extending in the circumferential direction or deviating by up to 60° from the circumferential direction with a groove depth of more than 0.5 µm.

The separating plate according to the invention is advantageously further developed in that the particle guide surface has particle guide grooves extending in the radial direction and/or in a direction deviating by up to 30°, in particular by up to 10°, from the radial direction. The particle guide grooves can be straight, curved or curved. In particular, the particle guide surface has a maximum roughness depth of at least 1 µm in the circumferential measurement direction and/or a mean roughness value of at least 0.2 µm, preferably at least 0.5 µm. In particular, the particle guide surface has particle guide grooves extending in the radial direction and/or in a direction deviating by up to 30°, in particular by up to 10°, from the radial direction with a groove depth of at least 0.5 µm.

The object underlying the invention is further achieved by a plate pack of the type mentioned at the outset, wherein a separating plate or several or all separating plates of the plate pack are designed according to one of the embodiments described above. With regard to the advantages and modifications of the plate pack according to the invention, reference is therefore made to the advantages and modifications of the separating plate according to the invention.

The object underlying the invention is further achieved by an aerosol rotary separator of the type mentioned at the outset, wherein the separating plates of the aerosol rotary separator according to the invention are designed according to one of the embodiments described above. With regard to the advantages and modifications of the aerosol rotary separator according to the invention, reference is therefore made to the advantages and modifications of the separating plate according to the invention.

• 1 einen erfindungsgemäßen Rotationsabscheider in einer schematischen Schnittdarstellung;
• 2 einen erfindungsgemäßen Abscheideteller in einer schematischen Perspektivdarstellung;
• 3 einen weiteren erfindungsgemäßen Abscheideteller in einer schematischen Perspektivdarstellung;
• 4 ein Formwerkzeugteil eines erfindungsgemäßen Formwerkzeugs in einer schematischen Perspektivdarstellung;
• 5 ein zu dem in der 4 dargestellten Formwerkzeugteil korrespondierendes Formwerkzeugteil in einer schematischen Perspektivdarstellung;
• 6 ein Formwerkzeugteil mit einer nicht-oberflächenbearbeiteten Rohfläche in einer schematischen Perspektivdarstellung;
• 7 das in der 6 dargestellte Formwerkzeugteil nach einer Oberflächenbearbeitung zur Erzeugung einer im Wesentlichen riefenfreien Forminnenfläche in einer schematischen Perspektivdarstellung; und
• 8 das in der 6 dargestellte Formwerkzeugteil nach einer Oberflächenbearbeitung zur Erzeugung einer Partikelführungsriefen aufweisenden Forminnenfläche in einer schematischen Perspektivdarstellung.

Preferred embodiments of the invention are explained and described in more detail below with reference to the accompanying drawings, in which:

• 1 a rotary separator according to the invention in a schematic sectional view;
• 2 a separating plate according to the invention in a schematic perspective view;
• 3 another separating plate according to the invention in a schematic perspective view;
• 4 a mold part of a mold according to the invention in a schematic perspective view;
• 5 one to the one in the 4 shown mold part corresponding mold part in a schematic perspective view;
• 6 a mold part with a non-surfaced raw surface in a schematic perspective view;
• 7 that in the 6 shown mold part after surface treatment to produce a substantially groove-free mold inner surface in a schematic perspective view; and
• 8 that in the 6 shown mold part after surface treatment to produce a mold inner surface with particle guide grooves in a schematic perspective view.

The 1 shows an aerosol rotary separator 100, which is designed as a disc separator. The aerosol rotary separator 100 serves to separate oil particles from a crankcase ventilation gas of an internal combustion engine.

The aerosol rotary separator 100 comprises a separator housing 102, wherein a separation chamber 104 is located in the separator housing 102. The separator housing 102 is preferably designed, as shown here, as a stationary, i.e. non-rotating, housing. A rotatably mounted separation rotor 106 is arranged in the separation chamber 104, which can be driven in rotation by a drive 108. The drive 108 is designed as an electric motor in the embodiment shown.

The separating rotor 106 comprises a carrier part 110 on which a plurality of separating plates 10 are arranged, stacked on top of one another in the longitudinal direction of the rotor. The separating plates 10 stacked on top of one another form a plate package 50. The separating rotor 106 is rotatably mounted on the axis 112. The bearing is implemented by two rolling bearings spaced apart from one another in the longitudinal direction of the rotor.

The separator housing 102 comprises a raw gas inlet 114, through which the gas contaminated with aerosol particles can flow into the separation chamber 104. The gas contaminated with aerosol particles then flows into the separation rotor 106, so that the gas can flow through the gaps between the separation plates 10 in a radial direction from the inside to the outside. As the gas flows through the gaps between the separation plates 10, the aerosol particles are separated from the gas, so that the separated aerosol particles can be discharged from the separator housing 102 via the particle outlet 118. The gas purified of aerosol particles can leave the separator housing 102 via the clean gas outlets 116.

Due to the soot particle load of the oil mist to be separated, there is a risk that particles will settle on the particle guide surfaces of the separating plates 10. This can lead to the gaps between the separating plates 10 becoming clogged with soot particles or agglomerated particle composites. In order to prevent or at least reduce this so-called sooting, the separating plates 10 are manufactured using a surface-treated mold.

The 2 and 3 show separating plates 10 which were manufactured with such a surface-treated mold.

The illustrated separating plates 10 have an injection-molded plate body 12 with a conical basic shape. The plate body 12 has an inner side 14 and an outer side 16. When an aerosol rotary separator 10 is in operation, the gas to be cleaned flows onto the inner side 14, so that the particle guide surface 18 is located on the inner side 14. The particle guide surface 18 therefore also serves to guide the aerosol particles to be separated.

The particle guide surface 18 is segmented by spacer bars 22 running in the radial direction, so that surface segments 20 are formed between the spacer bars 22. The spacer bars 22 serve as a support surface for a further separating plate 10 and thus define the height of the space between the separating plates 10 lying on top of one another and the height of the flow space through which the gas is to flow. The spacer bars 22 are arranged evenly over the circumference of the plate body 12.

The particle guide surface 18 of the 2 The illustrated separating plate 10 has a maximum roughness depth of less than 2 µm in the radial measuring direction. In addition, the particle guide surface 18 is free of circumferential grooves extending in the circumferential direction with a groove depth of more than 2 µm. The detailed representation of the surface structure 24 of the particle guide surface 18 shows that the particle guide surface 18 has particle guide grooves 28 extending in the radial direction 26. The particle guide grooves 28 are straight and have a groove depth of at least 0.5 µm. Due to the particle guide grooves 28 running in the radial direction, the particle guide surface 18 has a maximum roughness depth of at least 1 µm in the circumferential measuring direction and/or a mean roughness value of at least 0.2 µm, preferably at least 0.5 µm.

In the 3 In the illustrated separating plate 10, the surface structure 24 of the particle guide surface 18 also has particle guide grooves 28. The particle guide grooves 28 have an angle α to the radial direction 26. The angle α is preferably a maximum of 30°. In the illustrated embodiment, the angle α is approximately 20°.

The 4 and 5 show mold parts 202a, 202b of a mold 200 for an injection molding machine for injection molding a plate body 12 of a separating plate 10 having a conical basic shape. The mold parts 202a, 202b have tool bodies 204a, 204b, wherein the mold inner surfaces 206a, 206b of the tool bodies 204a, 204b specify the shape of the plate body 12 of the separating plate 10.

The inner mold surface 206a of the tool body 204a has surface segments 208 spaced apart from one another by web recesses 210. The spacing webs 22 of the separating plates 10 are produced via the web recesses 210. The inner mold surface 206a defines the surface structure 24 of the particle guide surface 18 of the separating plate 10. The inner mold surface 206a is surface-machined and free of circumferential grooves extending in the circumferential direction or deviating by up to 60° from the circumferential direction with a groove depth of more than 2 µm. The inner mold surface 206a of the mold part 202a defining the surface structure 24 of the particle guide surface 18 of the separating plate 10 is a smoothed surface. In the present case, the mold inner surface 206a is a polished surface which is surface-finished by a polishing process carried out in the radial direction. In other embodiments, the mold inner surface 206a can also be ground or brushed.

The 6 to 8 show different states of the mold part 202a of a mold 200 during production.

In the 6 In the state shown, the mold part 202a has a raw surface 216 comprising material removal grooves 218. The material removal grooves 218 are created by chip removal during the manufacture of the mold part 202a, namely during a turning process. The material removal grooves 218 are therefore turning grooves. The turning grooves extend essentially at right angles to the radial direction 214 of the mold part 202a. To prevent or at least reduce particle deposits on the particle guide surface 18 of the separator detellers 10, the material removal grooves 218 must be removed or at least reduced so that they are not transferred to the plate body 12 of the separating plate 10 during the injection molding process.

The 7 shows this in the 6 shown mold part 202a after surface treatment has taken place. The surface treatment smoothed the raw surface 216 so that the chip removal grooves 218 were removed or at least reduced. The tendency to sooting can already be significantly reduced by smoothing the mold part 202a.

A further reduction in the tendency to sooting can be achieved by introducing particle guide grooves 220 into the surface structure 212 of the mold inner surface 206a, as described in the 8 The particle guide grooves 220 support the particle guidance in the radial direction and lead to a further reduction in particle deposits. The particle guide grooves 220 can be produced by a polishing process carried out in the radial direction.

reference sign

10

separating plate

12

plate body

14

inside

16

outside

18

particle guide surface

20

surface segments

22

spacing bars

24

surface structure

26

radial direction

28

particle guide grooves

50

plate package

100

aerosol rotary separator

102

separator housing

104

separation chamber

106

separator rotor

108

drive

110

carrier part

112

axis

114

raw gas inlet

116

clean gas outlets

118

particle outlet

200

mold

202a, 202b

mold parts

204a, 204b

tool body

206a, 206b

mold inner surfaces

208

surface segments

210

web recesses

212

surface structure

214

radial direction

216

raw area

218

material removal marks

220

particle guide grooves

α

angle

QUOTES INCLUDED IN THE DESCRIPTION

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

Cited patent literature

• EP 2 704 840 B1 [0006]

Claims (11)

Method for producing a separating plate (10) for an aerosol rotary separator (100), comprising the step: - injection molding a plate body (12) of the separating plate (10) which has a conical basic shape and which has at least one particle guide surface (18) on at least one plate side (14) for guiding aerosol particles to be separated; characterized in that a mold (200) is used during injection molding which has a surface-machined inner mold surface (206a) which predetermines the surface structure (24) of the particle guide surface (18) and which is designed to be substantially free of circumferential grooves (218) extending in the circumferential direction or deviating by up to 60 degrees from the circumferential direction and having a groove depth of more than 2 µm. procedure according to claim 1 , characterized in that the inner mold surface (206a) of the mold (200) used in the injection molding of the plate body (12) defining the surface structure (24) of the particle guide surface (18) is a smoothed surface. procedure according to claim 1 or 2 , characterized in that the inner mold surface (206a) of the mold (200) used in the injection molding of the plate body (12), which defines the surface structure (24) of the particle guide surface (18), is a ground and/or brushed and/or polished surface. Method according to one of the preceding claims, characterized in that the mold inner surface (206a) of the molding tool (200) used in the injection molding of the plate body (12), which defines the surface structure (24) of the particle guide surface (18), is produced from a raw surface (216) produced by chip removal to form material removal grooves (218), wherein the number and/or shape of the material removal grooves (218) of the surface-machined mold inner surface (206a) is reduced in comparison to the raw surface (216). Method according to one of the preceding claims, characterized in that the inner mold surface (206a) of the molding tool (200) used in the injection molding of the plate body (12), which defines the surface structure (24) of the particle guide surface (18), has a maximum roughness depth of less than 2 µm and/or a mean roughness value of less than 0.8 µm in the radial measuring direction. Method according to one of the preceding claims, characterized in that the inner mold surface (206a) of the molding tool (200) used in the injection molding of the plate body (12), which defines the surface structure (24) of the particle guide surface (18), has particle guide grooves (220) extending in the radial direction (214) and/or in a direction deviating by up to 30 degrees, in particular by up to 10 degrees, from the radial direction (214). Molding tool (200) for an injection molding machine for injection molding a plate body (12) of a separating plate (10) having a conical basic shape, which has at least one particle guide surface (18) on at least one plate side (14) for guiding aerosol particles to be separated; characterized by a surface-machined mold inner surface (206a) defining the surface structure (24) of the particle guide surface (18). Separation plate (10) for an aerosol rotary separator (100), with - a plate body (12) injection-molded by means of a mold (200) and having a conical basic shape, which has at least one particle guide surface (18) on one side of the plate (14) for guiding aerosol particles to be separated, characterized in that the particle guide surface (18) has a maximum roughness depth of less than 2 µm and/or a mean roughness value of less than 0.8 µm in the radial measuring direction and/or is designed to be substantially free of circumferential grooves (218) extending in the circumferential direction or deviating by up to 60 degrees from the circumferential direction and having a groove depth of more than 2 µm. Separator plate (10) after claim 8 , characterized in that the particle guide surface (18) has particle guide grooves (28) extending in the radial direction (26) and/or in a direction deviating by up to 30 degrees, in particular by up to 10 degrees, from the radial direction (26). Plate pack (50) for an aerosol rotary separator (100), with - several separating plates (10) stacked one above the other, characterized in that one, several or all separating plates (10) of the plate pack (50) are arranged according to claim 8 or 9 trained. Aerosol rotary separator (100), in particular a disc separator, for a ventilation device of a crankcase of an internal combustion engine, with - a separator housing (102), and - a rotary separator (103) rotatable in the separator housing (102). mounted separator rotor (106) which comprises a plurality of separator plates (10) stacked on top of one another in the longitudinal direction of the rotor, wherein the separator housing (102) comprises a raw gas inlet (114) for the gas contaminated with solid and/or liquid aerosol particles and a clean gas outlet (116) for the gas cleaned of aerosol particles, characterized in that the separator plates (10) are arranged according to claim 8 or 9 trained.

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