DE102018105588A1 - Centrifugal separator for separating oil droplets from the crankcase ventilation gas of an internal combustion engine - Google Patents

Abstract

The invention relates to a centrifugal separator (1) for separating oil droplets from the crankcase ventilation gas of an internal combustion engine, with a rotor (2) having a shaft (27) with plates (23) arranged on top of each other so as to rotate against one another and forming a plate stack (20), adjacent plates being (23) in each case delimit a flow gap (24) with a housing (3) accommodating the rotor (2) with a raw gas inlet (32), clean gas outlet (33) and oil outlet (34) and with a rotary drive for the rotor (2).
The centrifugal separator (1) according to the invention is characterized
- that the stack of plates (20) seen in its axial direction is divided into two plate stacking parts (21, 22) which are separated within the rotor (2) in terms of flow by a separating element (26),
- That the raw gas inlet (32) opens into a radially inner region (21 ') of a first plate stacking part (21) and the first plate stack part (21) is operable in a direction from radially inward to radially outward of the crankcase ventilation gas,
- That a second plate stacking part (22) in operation in a direction from radially outside to radially inwardly flowed through by the crankcase ventilation gas and the clean gas outlet (33) from a radially inner region (22 ') of the second plate stacking part (22) starts and
- That the axial distance of adjacent plates (23) in the first plate stacking part (21) is smaller than in the second plate stacking part (22).

Description

The present invention relates to a centrifugal separator for separating oil droplets from the crankcase ventilation gas of an internal combustion engine, with a rotor having a central shaft with superimposed rotatably spaced therefrom, forming a plate stack plates, adjacent plates each defining a flow gap, with a rotatable the rotor receiving housing with a raw gas inlet, a clean gas outlet and an oil outlet and with a rotary drive for the rotor.

A stack of rotors of centrifugal separators for cleaning crankcase ventilation gas an internal combustion engine are preferably designed for a flow in the radial direction from the inside out due to the requirement of low pressure in the crankcase of the internal combustion engine, wherein the delivery effect of the rotor is utilized to the gas flow. This conveying effect also supports the return of the separated oil in the centrifugal separator, as seen in the gas flow direction behind the rotor, there is a higher pressure than in front of the rotor. On the other hand, it is known that in the radial direction from the outside inwardly flowed rotors with plate stack at the same boundary conditions have better oil separation, however, the delivery effect of the rotor counteracts the flow direction, which then the use of additional conveyors, such as compressors for the Gas flow required.

From the document DE 10 044 615 A1 For example, a crankcase crankcase of an internal combustion engine having a centrifugal oil separator having a mixture inlet for an air-oil mixture and an air outlet for clean air and an oil outlet for oil is known, wherein the centrifugal oil separator is formed as a plate separator. The plate separator preferably has a stator embodied as a housing, in which a rotor is housed, which has a plurality of plates which are arranged along the rotor axis parallel to one another and coaxially with the rotor axis. In each case between two adjacent plates, a gap is formed which connects an annular space formed in the interior of the rotor with a space surrounding the rotor in the interior of the housing. Furthermore, the venting device may comprise a compressor, which is connected upstream or downstream of the plate separator, wherein the compressor is dimensioned substantially so that it at least compensates for a pressure drop, which occurs during the flow through the plate separator. In a first embodiment, during operation of the oil separator, the air stream to be de-oiled flows in the radial direction from outside to inside through the gaps of the rotor, ie counter to the centrifugal force generated by the rotation of the rotor, which necessitates the use of the mentioned compressor. On the one hand, the compressor serves to substantially compensate for the pressure loss, which inevitably occurs during the flow through the plate separator. On the other hand, the compressor may also be dimensioned to produce a pressure rise across the separator-compressor unit. In another embodiment, the flow direction of the air stream to be de-oiled in the disk separator is reversed, that extends radially from the inside to the outside through the gaps of the rotor, in which case no separate compressor is required.

Another separator of the type mentioned is from the document DE 10 2007 054 922 A1 known. This document shows a separator for separating oil mist from the crankcase ventilation gas of an internal combustion engine, in particular a motor vehicle, with a gas cleaning space in which a rotatably mounted centrifugal rotor is arranged. The gas cleaning room has a raw gas inlet, a clean gas outlet and an oil outlet. By the raw gas inlet, the crankcase ventilation gas in a radially inner region of the centrifugal rotor can be introduced through the clean gas outlet is cleared of oil mist clean gas from the gas cleaning space and discharged through the oil outlet from the gas separated oil from the gas cleaning space. A rotary drive for the rotor is arranged in a separate from the gas cleaning space drive space of the separator and operable with pressurized lubricating oil of the internal combustion engine and connected via a running from the drive space in the gas cleaning space shaft with the centrifugal rotor. The centrifugal rotor is preferably formed by a Tellerstapelseparator from a number of stacked, positively and / or non-positively engaged with each other and / or standing with the shaft plates. This separator is designed for a flow through the rotor in the radial direction from the inside to the outside and thus exploits the delivery effect of the rotor on the gas flow, however, this is achieved by no optimum oil separation from the crankcase ventilation gas.

In the document DE 10 2004 057 411 A1 a plate separator is described which serves to remove impurities from a fluid. The disc separator comprises a rotor which rotatably supports a plurality of axially stacked and axially spaced apart plates, and a stator, the one Contains dirt collecting space in which the rotor is arranged. In the plate separator, a fluid path is formed, which leads from an inlet into the dirt collecting space, from the dirt collecting space radially inwardly between the plates through into a central outflow channel and from the discharge channel through an outlet from the plate separator. The dirt collecting space is divided by means of at least one throttle point axially into at least two subspaces, of which the fluid can flow out in parallel between the plates through to the outflow channel. In this case, the throttle point is formed by an annular gap which lies in a plane perpendicular to the axis of rotation extending separating plane. During operation of the plate separator, it is flowed through said fluid path by a fluid to be cleaned, at the same time the rotor is rotating. By friction and inertia effects entrained by the fluid are thereby displaced radially outward and remain so in the dirt collecting space, while the fluid can flow inwards. The field of application for such Tellerseparatoren lies in a lubricating oil circuit of an internal combustion engine, there to clean the lubricating oil from contaminants. For separation of oil droplets from the crankcase ventilation gas of an internal combustion engine, this plate separator is not designed and not suitable.

The document DE 68 928 908 T2 shows a device for liberating a liquid from a substance of higher density dispersed therein than that of the liquid. The apparatus comprises a separating centrifuge having a rotor which is rotatable about an axis of rotation and forms a separation chamber, with a stack of conical separation plates arranged coaxially with the rotor in the separation chamber, and with spacing means. The spacing means are formed and arranged between the dividing dividers so as to form, together with the latter, between two adjoining dividing plates a plurality of different flow paths, each having an inlet and a discharge area, which are at different distances from the axis of rotation of the rotor. Furthermore, the device has a device for supplying liquid to the inlet region of each flow path, and a device for removing disperse-removed liquid from the drainage region of each flow path. The inlet and the outlet region of each flow path lie at such radial locations that the main part of the fluid on the flow path has to cross the greater part of the radial extent of the two separation plates, between which the flow path is formed. In this case, the rotor is rotatable in a predetermined direction and in each case two successive spacer devices between two successive separation plates are shaped such that they each extend from the inlet to the outlet region of the flow path formed between them in a direction which includes a radial component and a component in the circumferential direction of the Rotor has. In a preferred embodiment, the centrifuge rotor has an upper part and a lower part, which are held together axially with a locking ring. The centrifuge rotor is supported by means of a drive shaft, which is connected to the rotor lower part. The rotor parts form a separation chamber, in which two stacks of part-conical separation plates are arranged coaxially with the rotor, wherein in operation the separation chamber rotates together with the rotor. A part-conical partition is inserted between the stacks of the separation plates. The separation plates and the partition wall are fixed radially and in their circumferential direction relative to each other. For separation of oil droplets from the crankcase ventilation gas of an internal combustion engine, this plate separator is not designed and not suitable.

For the present invention, therefore, the object is to provide a centrifugal separator of the type mentioned above, on the one hand provides a good separation of oil droplets from the crankcase ventilation gas of an internal combustion engine and on the other hand, a useful delivery effect for the crankcase ventilation gas, without requiring an additional conveyor, such as compressors, to need.

• - dass der Tellerstapel in seiner Axialrichtung gesehen in zwei Tellerstapelteile unterteilt ist, die innerhalb des Rotors strömungsmäßig durch ein Trennelement voneinander getrennt sind,
• - dass der Rohgaseinlass in einen radial inneren Bereich eines ersten Tellerstapelteils mündet und der erste Tellerstapelteil im Betrieb des Zentrifugalabscheiders in einer Richtung von radial innen nach radial außen von dem Kurbelgehäuseentlüftungsgas durchströmbar ist,
• - dass ein zweiter Tellerstapelteil im Betrieb des Zentrifugalabscheiders in einer Richtung von radial außen nach radial innen von dem Kurbelgehäuseentlüftungs-gas durchströmbar ist und der Reingasauslass von einem radial inneren Bereich des zweiten Tellerstapelteils ausgeht und
• - dass der axiale Abstand einander benachbarter Teller in dem ersten Tellerstapelteil des Tellerstapels kleiner ist als in dem zweiten Tellerstapelteil des Tellerstapels.

The object is achieved according to the invention with a centrifugal separator of the type mentioned, which is characterized

• - That the stack of plates seen in its axial direction is divided into two plate stacking parts, which are fluidly separated within the rotor by a separating element,
• - That the raw gas inlet opens into a radially inner region of a first plate stacking part and the first plate stack part is flowed through during operation of the centrifugal separator in a direction from radially inward to radially outward of the crankcase ventilation gas,
• - That a second plate stacking part in the operation of the centrifugal separator in a direction from radially outward to radially inwardly flowed through by the crankcase ventilation gas and the clean gas outlet from a radially inner region of the second plate stacking part emanates and
• - That the axial distance of adjacent plates in the first plate stacking part of the plate stack is smaller than in the second plate stacking part of the plate stack.

By the two-stage oil separation in the two sequentially flowed through by the crankcase ventilation gas plate stacking parts a particularly good separation of oil droplets from the crankcase ventilation gas is achieved, to which especially flows from outside to inside flowed second Tellerstapelteil. At the same time, the centrifugal separator has a conveying effect on the gas flow of the crankcase ventilation gas generated by the first stacking plate part, which can be used to avoid at least an undesirable differential pressure via the centrifugal separator or even to provide a desired low pressure or negative pressure in the crankcase. In addition, the conveying effect allows an active oil return through the oil outlet, preferably back into the crankcase of the associated internal combustion engine. A further advantage is that the separated in the centrifugal separator from the crankcase ventilation gas oil droplets are kept away from the clean gas outlet, which avoids the risk of entrainment of previously separated oil with the clean gas in the clean gas outlet.

The separation mechanism in centrifugal separators with a rotor with stack of plates for separating oil droplets from the crankcase ventilation gas of an internal combustion engine is well known in itself and therefore need not be described separately here.

Further, it is preferably provided for the centrifugal separator according to the invention that the first plate stacking part, in the radially inner region of the raw gas inlet forms a lower plate stacking part of the plate stack during operation of the centrifugal and that the second plate stack part, from the radially inner region of the clean gas outlet emanating from a Operation of the centrifugal separator upper plate stacking part of the plate stack forms. Since a larger proportion of the oil droplets is deposited in the first plate stacking part, in this embodiment, an advantageously short path is made possible for the oil removal from the housing of the centrifugal separator. Alternatively, the first plate stacking part, in the radially inner region of the raw gas inlet, form an upper plate stacking part of the stack of plates during operation of the centrifugal separator and the second plate stacking part, from the radially inner region of the clean gas outlet, form a lower plate stacking part of the plate stack during operation of the centrifugal separator , Also in this embodiment of the centrifugal separator an effective oil separation is achieved.

A further embodiment provides that the number of plates in the first plate stacking part of the plate stack is greater than in the second plate stacking part of the plate stack. This ensures a uniform oil separation in the two plate stack parts and a sufficiently large conveying effect. A favorable and thus preferred ratio of the number of plates in the first plate stacking part to the number of plates in the second plate stacking part is for example in the range of 1.5 to 1 to 3 to 1.

Preferably, it is further provided that the plates each have a truncated cone-shaped contour with a radially inner, each with at least one flow opening formed flat plate member and a radially outer, non-piercing, cone-shaped plate part. The plates thus have a simple, but effective for the separation of oil form and can cost z. B. as injection molded parts made of plastic or as stampings made of sheet metal. In addition, here the supply and distribution of the flow of the crankcase ventilation gas to be cleaned in the first plate stacking part and the collection and discharge of the flow of purified crankcase ventilation gas in the second plate stacking part through the flow openings in the plates of the plate stack done so that the central shaft for the gas guide is not needed.

In order to keep the two stacked stack parts within the rotor fluidly separating separating element simple, this is preferably formed by a arranged between the two plate stack parts flow-through cut-off wheel.

In this case, it is further preferred that the separating disc forming the separating element has a shape which corresponds or approximates the shape of the plate and, like the plate, is arranged rotationally fixed on the central shaft. The cutting disc can thus be easily manufactured as a variant of the plate, in a plastic plate z. B. using a replaceable injection mold insert or a sheet metal plate z. B. by omitting a punch for the central flow passage.

Another embodiment provides that the plates each have a truncated cone-shaped contour with a radially inner, non-pierced flat plate member and a radially outer, unbroken cone-shaped plate member, that the central shaft in communication with the raw gas inlet hollow shaft with radial, in the flow gaps between the plates opening flow openings is and that the separating element is formed by a arranged in the hollow central shaft lock. In this embodiment, the central shaft for the supply and distribution of the current used to clean the crankcase ventilation gas in the first plate stacking part and the collection and discharge of the flow of purified crankcase ventilation gas in the second plate stacking part, so that here are the plates with their full surface for oil separation available.

A development of the centrifugal separator provides that all plates in the stack of plates are identical and that between two plates in the first plate stacking separate first, in Tellerstapelaxialrichtung lower spacers and between each two plates in the second plate stacking separate second, in Tellerstapelaxialrichtung higher spacers are arranged. Here is sufficient a single version of the plate and there are only two different, compared to the plates simpler, spacers needed.

An alternative development of the centrifugal separator provides that all plates in the stack of plates are identical, that each plate in at least two different relative rotational positions with the central shaft can be brought into rotational engagement and that each plate is designed with two such different spacers that in dependence from a rotational position of two adjacent plates relative to each other two different axial distances of the adjacent plates in the stack of plates are adjustable. Also in this embodiment of the centrifugal separator only a single embodiment of the plate is required, which are designed with spacers, which can be adjusted depending on the angle of rotation two different plate spacings.

A further alternative embodiment of the centrifugal separator provides that two different types of plates are arranged in the stack of plates and in the first plate stacking first, in Tellerstapelaxialrichtung lower spacers having plates and in the second Tellerstapelteil second, in Tellerstapelaxialrichtung higher spacers having plates are arranged. Although two different plates are needed here, but this assembly of the rotor is simplified, because when attaching the plate on the shaft does not have to be paid to a certain rotational position of the plate relative to each other.

Finally, it is provided for the centrifugal separator according to the invention that the housing of the centrifugal separator has a peripheral wall whose inner surface surrounds the rotor at a distance and adjoins the lower end of the oil outlet in the operation of the centrifugal separator. For discharging the deposited oil precipitated on the peripheral wall, gravity is used here, which, in conjunction with the conveying effect of the rotor, ensures safe and rapid discharge and return of the oil.

• 1 einen Zentrifugalabscheider mit Rotor, in einem schematischen Längsschnitt,
• 2 einen gegenüber 1 anders ausgeführten Rotor des Zentrifugalabscheiders, in Draufsicht,
• 3 den Rotor aus 2 im Längsschnitt gemäß der Schnittlinie III - III in 2, und
• 4 den Rotor aus 2 und 3 in einer Ansicht schräg von oben.

Embodiments of the centrifugal separator according to the invention are explained below with reference to a drawing. The figures of the drawing show:

• 1 a centrifugal separator with rotor, in a schematic longitudinal section,
• 2 one opposite 1 differently designed rotor of the centrifugal separator, in plan view,
• 3 off the rotor 2 in longitudinal section according to the section line III - III in 2 , and
• 4 off the rotor 2 and 3 in a view diagonally from above.

In the following description of the figures, the same parts in the various drawing figures are always provided with the same reference numerals, so that not all drawings have to be explained again.

1 The drawing shows a centrifugal separator 1 in a schematic longitudinal section. The centrifugal separator 1 has a rotor 2 and a the rotor 2 receiving and surrounding housing 3 , The rotor has a plate stack 20 from a plurality of frustoconical contoured plates 23 on, which are arranged at a distance above each other and each between them flow gaps 24 form.

Below is the plate stack 20 through a stacking pedestal 28 and on the top by a stacking attachment 28 ' limited and held together. By means of two bearings 29 . 29 ' is the rotor 2 rotatably in the housing take him 3 stored and over a in 1 not specifically shown, known per se rotary drive in rotation about the axis of rotation 27 ' movable.

The plate stack 20 is here from a first, lower plate stacking part 21 and a second, upper plate stacking part 22 , each consisting of several on a here only indicated central shaft 27 rotationally arranged plates 23 , composed. Between the two plate stack parts 21 . 22 is a these separating flow-moderately separating element 26 arranged here as one in their shape the shape of the plates 23 adapted cutting disc is executed.

In the first, lower plate stacking section 21 is the axial distance of each plate 23 smaller than the distance between each plate 23 in the second, upper plate stacking part 22 , Furthermore, here is the number of plates 23 in the first, lower plate stacking part 21 larger than the number of plates 23 in the upper, second plate stacking part 22 ,

The housing 3 has an interior 30 in which the rotor 2 is arranged. A peripheral wall 31 of the housing 3 surrounds the rotor 2 with radial distance. A raw gas inlet 32 is central to the bottom of the case 3 arranged, a clean gas outlet 33 is central to the top of the case 3 arranged and radially outside on the underside of the housing 3 is an oil outlet 34 arranged.

The central wave 27 Here is one with the raw gas inlet 32 in fluid communication standing hollow shaft with radial, in the flow column 24 between the plates 23 opening flow breaks. The separating element 26 It can also be an only the free cross section of the hollow central shaft 27 shut-off lock.

In operation of the centrifugal separator 1 becomes the rotor 2 offset by the rotary drive, not shown here in a fast rotation. From oil droplets to be cleaned Kurgehäuseentlüftungsgases flows, coming from the crankcase of an associated internal combustion engine, through the central raw gas inlet 32 and a lower part of the hollow central shaft 27 in the radially inner region 21 ' the first, lower plate stacking part 21 , From there, the crankcase ventilation gas flows through the flow gaps 24 between the plates 23 the first, lower plate stacking part 21 in the radial direction to the outside.

A direct axial overflow of the crankcase ventilation gas from the radially inner region 21 ' the first, lower plate stacking part 21 in the radially inner region 22 ' the second, upper plate stacking part 22 is through the separator 26 prevented.

The oil droplets entrained in the gas stream first strike against the underside of the plates 23 from there and are conveyed by centrifugal force radially outward and finally thrown radially outward, after which the oil droplets 4 on the inner surface of the peripheral wall 31 knock down.

The crankcase ventilation gas exits radially outward from the flow gaps 24 between the plates 23 the first, lower plate stacking part 21 out, then flows radially outside the plate stack 20 up and enters the flow column 24 between the plates 23 the second, upper plate stacking part 22 on. In these flow columns 24 the crankcase ventilation gas flows in the radial direction from outside to inside, possibly still contained in the gas flow residual oil droplets deposited and transported by centrifugal force radially outward and then also on the peripheral wall 31 of the housing 3 be thrown off.

The cleaned crankcase ventilation gas then passes into the radially inner region 22 ' the second, upper plate stacking part 22 and from there through the upper part of the hollow central shaft 27 in the subsequent, central clean gas outlet 33 , The clean gas outlet 33 For example, it can be connected to an air intake tract of the associated internal combustion engine.

The course of the flow of the crankcase ventilation gas through the centrifugal separator 1 is in 1 illustrated by flow arrows.

The on the inner surface of the peripheral wall 31 precipitated oil droplets 4 form there an oil film, which under the influence of gravity down into the oil outlet 34 flows and dissipated by this, in particular in the crankcase of the associated internal combustion engine is returned, is. The oil outlet 34 So it is advantageous in a region of the housing 3 through which the crankcase ventilation gas flows, which the first, lower plate stacking part 21 has already flowed through, the second, upper plate stacking part 22 but has not yet flowed through.

As the clean gas outlet 33 from the separated oil collecting and dissipating peripheral wall 31 of the housing 3 far away, there is no risk of unwanted entrainment of already separated oil in the clean gas outlet 33 ,

2 shows a rotor 2 of the centrifugal separator 1 in plan view. In the center of the rotor 2 is a central wave 27 visible to which the not visible here, through the stacking tower 28 ' covered plate of plate pile 20 rotationally fixed, for example by means of a mutual toothing, are placed. The rotor 2 is about the axis of rotation 27 ' , which is the longitudinal center axis of the shaft 27 corresponds, rotatable. Radial inside are in 2 several flow openings 23 ' recognizable here in the radially inner region of the stacking attachment 28 ' and also of the latter hidden plate are arranged.

3 shows the rotor 2 out 2 in longitudinal section according to the section line III - III in 2 , Central in 3 is the substantially vertical shaft during operation of the centrifugal separator 27 visible. Down in 3 is the stacking pedestal 28 who is here with the wave 27 is made in one piece. On the stacking pedestal 28 is a first, bottom plate 23 ,

The central wave 27 here has a metallic core shown in view, z. As steel, and a surrounding jacket, in particular a molded plastic jacket, which is shown in section. The central wave 27 is here, unlike in 1 , not hollow and therefore here are the flow openings 23 ' radially inside in the plates 23 as well as in the stacking pedestal 28 ' and stacking tower 28 intended. Above and below points the central shaft 27 each have a non-jacketed end portion, which is for rotatably supporting the rotor 2 and serve for the connection of the rotary drive.

Next up in 3 are two more plates 23 and a separator disposed therebetween 26 shown. Further, between the bottom plate 23 and under the partition 26 arranged plate 23 provided plates 23 are not shown here for clarity, but in practice exist.

At the top of 3 is the stacking tower 28 ' with a top plate immediately below 23 shown. Further, between the top plate 23 and above the separator 26 arranged plate 23 provided plates 23 are also not shown here for reasons of clarity, but in practice available.

All dishes 23 of the rotor 2 together make up the plate stack 20 , The plates 23 , which are below the separator 26 are arranged, form a first, lower plate stacking part 21 of the pile of plates 20 and the plates 23 that is above the separator 26 are arranged, forming a second, upper plate stacking part 22 of the pile of plates 20 , The individual plates 23 and the central wave 27 are by means of a mutual toothing in a rotationally engaged with each other.

At the bottom of the plate 23 here are each a number of spacers 25.1 . 25.2 molded, which is the shape of in the radial direction of the plate 23 extending, circumferentially spaced webs have. Between through the spacers 25.1 . 25.2 axially spaced plates 23 the flow gaps run 24 ,

For the production of the basis of the 1 already explained different plate distances in the two plate stack parts 21 . 22 are the spacers 25.1 at the plates 23 in the first, lower plate stacking part 21 designed with a smaller axial height and the spacers 25.2 at the plates 23 in the second, upper plate stacking part 21 designed with a greater axial height compared to this.

In practice, the axial height of the flow gaps is usually only a few tenths of a millimeter and the difference of the plate distances in the first and second plate stacking part at only a few tenths of a millimeter, so that the distance differences are practically not visible to the naked eye.

Instead of molded spacers 25.1 . 25.2 can also be executed as individual parts, separate spacers with two different axial heights between the then identical plates 23 be arranged. There is also the possibility that all plates 23 in the plate stack 20 identical are that every plate 23 in at least two different relative rotational positions with the central shaft 27 is in rotationally engageable and that every plate 23 with two such different spacers 25.1 . 25.2 is executed, that in response to a rotational position of two adjacent plates 23 relative to each other two different axial distances of the adjacent plates 23 in the plate stack 20 are adjustable.

In each case right of the shaft 27 is in the plates 23 one each of their flow openings 23 ' cut and thus visible.

The plates 23 each have a frusto-conical contour with a radially inner, each with flow openings 23 ' trained flat plate part 23.1 and a radially outer, non-piercing, cone-shaped plate portion 23.2 on.

It becomes clear in 3 continue that in its shape the plates 23 similar separating element 26 has no flow openings and thus that a direct overflow of crankcase ventilation gas from the radially inner region 21 ' the first, lower plate stacking part 21 in the radially inner region of the second, upper plate stacking part 22 Is blocked. This ensures that during operation, the first, lower plate stacking part 21 in the radial direction from the inside to the outside and then the second, upper plate stacking part 22 flows through in the radial direction from outside to inside of the crankcase ventilation gas.

4 finally shows the rotor 2 out 3 in a view diagonally from above. The central wave 27 protrudes with an uncoated end portion upwards from the rest of the rotor 2 before, for example, there to arrange a pivot bearing and / or connect a rotary drive, not shown here.

At the bottom of 4 is the stacking pedestal 28 and up in 4 is the stacking tower 28 ' , the plate stack between them 20 take up. Upper side are on the rotor 2 radially inside the flow openings 23 ' visible.

About halfway up the pile of plates 20 lies in this embodiment, the separating element 26 , which is the first, lower plate stacking part 21 from the second, upper plate stacking part 22 inside the plate pile 20 fluidly separates. By the in 4 left and right of the rotor 2 illustrated flow arrows is illustrated that the flow of the crankcase ventilation gas after the radially outward leakage from the first flowed through the first plate stacking part 21 radially outside around the separating element 26 flows around and then with a radially inward flow direction in the then flowed through the second, upper plate stacking part 22 flows.

The degree of separation of the centrifugal separator 1 and its delivery effect on the crankcase ventilation gas and the setting of a defined pressure difference across the centrifugal separator 1 in its operation can be demanded z. B. by changing the number and / or size of the plate 23 in the plate stack 20 , By changing the ratio of the plate numbers in the two stacked plate parts 21 . 22 and / or by changing the distance of the plates 23 from each other in the plate stack parts 21 . 22 in the plate stack 20 specifically influenced and so for the particular application of the centrifugal separator 1 adapted and optimized.

LIST OF REFERENCE NUMBERS

character designation 1 centrifugal 2 rotor 20 A stack of plates 21 first plate stacking part (below) 21 ' radially inner region of 21 22 second plate stacking part (top) 22 ' radially inner region of 22 23 Plate 23 ' Flow openings in 23 23.1 radially inner plate part 23.2 radially outer plate part 24 flow gaps 25.1, 25.2 first, second spacers 26 separating element 27 central shaft 27 ' axis of rotation 28 Stack pedestal 28 ' stack paper 29, 29 ' warehouse 3 casing 30 inner space 31 peripheral wall 32 raw gas inlet 33 pure gas outlet 34 oil outlet 4 oil droplets

QUOTES INCLUDE IN THE DESCRIPTION

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

Cited patent literature

• DE 10044615 A1 [0003]
• DE 102007054922 A1 [0004]
• DE 102004057411 A1 [0005]
• DE 68928908 T2 [0006]

Claims (11)

Centrifugal separator (1) for separating oil droplets from the crankcase ventilation gas of an internal combustion engine, with a rotor (2) having a central shaft (27) with spaced apart therefrom with rotationally fixed, a plate stack (20) forming plates (23), wherein adjacent plates (23) each defining a flow gap (24), with a rotor (2) rotatably receiving housing (3) with a raw gas inlet (32), a clean gas outlet (33) and an oil outlet (34) and with a rotary drive for the rotor ( 2), characterized in that - seen in its axial direction - the plate stack (20) is subdivided into two plate stacking parts (21, 22) which are fluidly separated within the rotor (2) by a separating element (26), - the raw gas inlet (32) in a radially inner region (21 ') of a first plate stacking part (21) opens and the first plate stacking part (21) in the operation of the centrifugal separator (1) in a Richtu ng from radially inwardly to radially outwardly flowed through by the crankcase ventilation gas, - that a second plate stack part (22) in the operation of the centrifugal separator (1) in a direction from radially outside to radially inwardly flowed through by the crankcase ventilation gas and the clean gas outlet (33) of a radially inner region (22 ') of the second plate stacking part (22) emanates and - that the axial distance of adjacent plates (23) in the first plate stacking part (21) of the plate stack (20) is smaller than in the second plate stacking part (22) of the plate stack (20). Centrifugal separator after Claim 1 , characterized in that the first plate stacking part (21), in the radially inner region (21 ') of the raw gas inlet (32) opens, during operation of the Zentrifugalabscheiders (1) lower Tellerstapelteil the plate stack (20) and the second Tellerstapelteil forms (22), from the radially inner region (22 ') of the clean gas outlet (33) emanates, an upper plate stacking part of the plate stack (20) during operation of the centrifugal separator (1) or that the first plate stacking part (21), in its radially inner region (21 ') of the raw gas inlet (32) opens, one during operation of the centrifugal separator (1) upper plate stacking part of the plate stack (20) and forms the second plate stacking part (22), from the radially inner region (22') of the clean gas outlet (33) , a in the operation of the centrifugal separator (1) lower plate stacking part of the plate stack (20). Centrifugal separator after Claim 1 or 2 , characterized in that the number of plates (23) in the first plate stacking part (21) of the plate stack (20) is greater than in the second plate stacking part (22) of the plate stack (20). Centrifugal separator according to one of Claims 1 to 3 , characterized in that the plates (23) each have a truncated cone-shaped contour with a radially inner, each with at least one flow opening (23 ') formed flat plate member (23.1) and a radially outer, unbroken, cone-shaped plate part (23.2). Centrifugal separator according to one of Claims 1 to 4 , characterized in that between the two plate stack parts (21, 22) arranged separating element (26) is formed by a flow-through-free cutting disc. Centrifugal separator after Claim 4 and 5 , characterized in that the separating disc (26) forming cutting disc has a shape of the plate (23) corresponding or approximate shape and how the plate (23) rotationally on the central shaft (27) is arranged. Centrifugal separator according to one of Claims 1 to 3 , characterized in that the plates (23) each have a truncated cone-shaped contour with a radially inner, non-pierced flat plate member (23.1) and a radially outer, non-piercing cone-shaped plate portion (23.2), that the central shaft (27) with the Rohgaseinlass ( 32) is in flow-connected hollow shaft with radial, in the flow gaps (24) between the plates (23) opening out flow openings and that the separating element (26) is formed by a in the hollow central shaft (27) arranged barrier. Centrifugal separator according to one of Claims 1 to 7 , characterized in that all the plates (23) in the stack of plates (20) are identical and that between each two plates (23) in the first plate stacking part (21) separate first, in Tellerstapelaxialrichtung lower spacers (25.1) and between each two plates (23) in the second plate stacking part (22) separate second, in Tellerstapelaxialrichtung higher spacers (25.2) are arranged. Centrifugal separator according to one of Claims 1 to 7 , characterized in that all the plates (23) in the plate stack (20) are identical, that each plate (23) in at least two different relative Twist positions with the central shaft (27) in rotationally fixed engagement can be brought and that each plate (23) with two such different spacers (25.1, 25.2) is executed, that in dependence on a rotational position of two adjacent plates (23) relative to each other two different axial distances of the adjacent plates (23) in the stack of plates (20) are adjustable. Centrifugal separator according to one of Claims 1 to 7 , characterized in that in the stack of plates (20) two different types of plates (23) are arranged and in the first plate stacking part (21) first, in Tellerstapelaxialrichtung lower spacers (25.1) having plates (23) and in the second plate stacking part (22 ) second, in Tellerstapelaxialrichtung higher spacers (25.2) having plates (23) are arranged. Centrifugal separator according to one of Claims 1 to 10 , characterized in that the housing (3) of the centrifugal separator (1) has a peripheral wall (31) whose inner surface surrounds the rotor (2) at a distance and to the lower end of the inner surface of the centrifugal separator (1) Peripheral wall (31) of the oil outlet (34) connects.

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