Improved rotating separator

Abstract

A rotating separator (1) for the separation of a blow-by flow, comprising a filter assembly (4) housed inside a housing (3) and integral with a casing (2) and comprising a first body (14) and a second body (15) configured to keep a filter material (16) packed axially tightly with respect to the casing (2), the first body (14) is annular and comprises a tubular element (29) housed between the openings (6, 7) and the first body (14), the tubular element (29) defining a space (30), the space (30) defining openings (31) connecting the space (30) with the outlet (7).

Description

[0001] IMPROVED ROTATING SEPARATOR

[0002] Cross-Reference to Related Applications

[0003] This Patent Application claims priority from Italian Patent Applications No. 102025000001071 , No. 102025000001041 , No. 102025000001035, No. 102025000001050 e No. 102025000001029 filed on January 21 , 2025, the entire disclosure of which is incorporated herein by reference.

[0004] Technical Field

[0005] This invention relates to a separator for a gas and oil mixture of a vehicle engine, in particular a separator, advantageously also rotating, for the blow-by mixture from a vehicle’s internal combustion engine block.

[0006] Background of the Invention

[0007] In internal combustion engines, leaks of gas and oil vapours, known as blow-by, occur in the engine cylinder head and block during operation. These gases must then be expelled from the engine block to prevent the cylinder head cover or oil sump casing from exploding and to prevent damage to the seals of these elements.

[0008] The law requires that these gases and oil vapours must not be released into the atmosphere for environmental reasons. Therefore, different devices have been developed over time apt to separate the air from the oil so that both can be properly disposed of.

[0009] Examples of such known devices are shown in patent applications EP3825526 A1 and EP3594461 A1.

[0010] However, the above-mentioned devices suffer from various shortcomings such as poor efficiency or clogging (saturation at low engine speed) or they are cumbersome.

[0011] Also, under certain operating conditions, oil tends to return to the flow after its purification, rendering the device ineffective.

[0012] Other examples are illustrated in US4981502A, US11448107 B2 or FR2933626 A1 , which, however, illustrate filter elements designed to allow coalescence filtering of the blow-by flow. Such coalescence filter systems provide high drag, generating significant pressure drops.

[0013] Therefore, there is a need to improve known blow-by separators to make them more efficient, compact and economical.

[0014] The aim of the present invention is to meet the above requirements.

[0015] Summary of the Invention

[0016] The above-mentioned purpose is achieved with a separator as claimed in the attached claims, which are an integral part of this description.

[0017] Brief Description of the Drawings

[0018] For a better understanding of the present invention, a preferred embodiment is described in the following, by way of non-limiting example, and with reference to the attached drawings, wherein:

[0019] • Figure 1 is a schematic cross-section view with parts removed for clarity, illustrating aseparator according to a first embodiment of this invention;

[0020] • Figures 2 and 3 are respective schematic, diametric cross sections with parts removed for clarity, illustrating the separator in Figure 1 with an indication of the blow-by path within the separator at different cross-section angles;

[0021] • Figures 4A and 4B are plan views of two elements forming part of the separator according to the invention in their first embodiment;

[0022] • Figures 5A and 5B are plan views of two elements forming part of the separator according to the invention in their second embodiment;

[0023] • Figure 6 is a perspective, cross-section view of the separator in Figure 2;

[0024] • Figure 7 is a diametric cross section of an additional embodiment of the filter device; • Figure 8 is a perspective view of an element of the filter assembly of the filter device according to Figure 7;

[0025] • Figure 9 is a schematic cross-section view with parts removed for clarity, illustrating a separator according to a second embodiment of this invention;

[0026] • Figure 10 is a schematic, diametric cross section with parts removed for clarity, illustrating the separator in Figure 9 with an indication of the blow-by path within the separator; and • Figures 11 and 12 are respective schematic, diametric cross sections with parts removed for clarity, illustrating the separator in Figure 9 according to additional embodiments of the invention.

[0027] Detailed Description of the Invention

[0028] A separator for separating a blow-by flow into air and oil for an engine system, such as an internal combustion engine - partially visible in Figure 1 - is illustrated, as a whole, in the attached figures with reference number 1.

[0029] The separator 1 comprises a casing 2 configured to define a housing 3 to accommodate a blow-by filter assembly 4. The filter assembly 4 is integral with the rotation with respect to the casing 2 and also advantageously integral with the translation along a longitudinal axis A of the separator 1 and a transverse axis B perpendicular to the axis A.

[0030] In particular, the casing 2 comprises an upper cover 2a and a lower cover 2b connected to define the housing 3 and placed diametrically opposite the filter assembly 4 along the axis A.

[0031] At least one of either the upper cover 2a or the lower cover 2b, and more preferably both, preferably have an axisymmetric shape around the axis A and together define an essentially cylindrical housing volume.

[0032] Advantageously, the upper cover 2a has a bell shape facing the lower cover 2b; in more detail, the upper cover 2a comprises an axial wall 2a' and a radial wall 2a” extending perpendicularly towards the lower cover 2b from one end of the axial wall 2a'.

[0033] The lower cover 2b essentially comprises an axial wall 2b', diametrically opposite the axial wall 2a' and having an external diameter at least equal to the radial wall 2a” of the upper cover 2a so as to cooperate in contact with it to delimit the housing 3.As described above, the housing 3 is thus axially delimited by the axial walls 2a', 2b' of the covers 2a, 2b and laterally delimited by the radial wall 2a” of the upper cover 2a.

[0034] Both the lower cover 2b and the upper cover 2a also define, respectively, an inlet 6 and an outlet 7 for the blow-by flow passing through the filter assembly 4.

[0035] Advantageously, the outlet 7 is defined by the upper cover 2a and, in particular, passes through the axial wall 2a' of the upper cover 2a.

[0036] More specifically, the upper cover 2a comprises an annular wall 8 extending perpendicularly around the edge of the outlet 7 from the axial wall 2a'.

[0037] Advantageously, the inlet 6 is defined in the lower cover 2b and, in particular, is formed in the axial wall 2b' of the same. Advantageously, it is coaxial to the outlet 7 and preferably has a larger diameter than the latter.

[0038] More specifically, the lower cover 2b comprises an annular wall 9 extending perpendicularly around the edge of the inlet 6 from the axial wall 2b'.

[0039] Advantageously, to keep the filter assembly 4 packed axially tightly within the casing 2, relative clamping means 10 configured to generate a preload, which keeps said elements packed axially tightly so that they are integral with rotation, are also provided.

[0040] These clamping means 10 preferably comprise threaded elements 11 passing through the casing 2 and the elements comprising the filter assembly 4 and configured to couple to the rotation and define an axial load between such elements.

[0041] According to the embodiment described, there are three threaded elements 11 that are housed within respective through holes 12 made coaxially in the casing 2 and to the elements comprising the filter assembly 4.

[0042] Specifically, the threaded elements 11 comprise a screw and a nut; the screw can be inserted from the upper cover 2a and tightened on the lower cover 2b.

[0043] Specifically, these clamping means 10 make the casing 2 integral with a rotating assembly 13 of the engine system, illustrated in Figure 1 and not further described for brevity’s sake.

[0044] The filter assembly 4 essentially comprises a first body 14, a second body 15 and a filter material 16 arranged one above the other in the order shown.

[0045] In particular, the filter material 16 is placed in contact with the lower cover 2b, which in turn is placed on the opposite side in contact with the second body 15 and in turn is placed in contact with the first body 14.

[0046] In particular, the filter material 16 comprises a composite material, more specifically a fleece. The fleece is a material that acts as an impactor, that is, it allows the oil in the blow-by flow to collect in it without allowing air to pass through it.

[0047] The filter assembly 4 comprises a channel 17 configured to fluid ically connect the inlet 6 to the outlet 7 accelerating the blow-by flow and facilitating it hitting the filter material 16.

[0048] In the embodiments described, this channel 17 is defined between the first and second body 14, 15.More specifically, the channel 17 is defined by first openings 18 made in the first body 14 and second openings 19 made in the second body 15.

[0049] Advantageously, the first openings 18 are blind, that is, they are recesses in the first body 14, while the second openings 19 are through openings in the second body 15.

[0050] Additionally, the filter material 16 is also disc-shaped.

[0051] According to the embodiments illustrated, the fleece-type filter material 16 has fibres configured and oriented to release the oil particles trapped in it freely outside the rotating separator 1.

[0052] The casing 2, in particular the upper cover 2a, defines at least one opening 20 fluidically connected to the filter material 16 to allow the above-mentioned oil particles to escape.

[0053] Specifically, this at least one opening 20 is made at the end of the radial wall 2a'.

[0054] In the first embodiment illustrated in Figures 1 to 7, the first body 14 has a shaped profile 27 and is configured to reduce the inlet pressure drop.

[0055] Advantageously, the first body 14 has a disc shape sized to be spaced apart from both the radial wall 2a” and the axial wall 2a' of the upper cover 2a.

[0056] According to the first embodiment in Figures 1 to 3, the filter material 16 is fluidically connected to the inlet 6 only via the channel 17.

[0057] For this purpose, the lower cover 2b defines a shoulder 2c extending radially towards the space 3 from the inlet 6. Specifically, the shoulder 2c cooperates in contact with the second fluid-tight body 15.

[0058] Thus, the filter material 16 is radially contained between the shoulder 2c and the upper cover 2a and axially contained between the second body 15 and the lower cover 2b.

[0059] Returning to the channel 17, in the first embodiment it has a labyrinthine path defining multiple blow-by flow reversals, at least three specifically.

[0060] In the embodiment described, the first openings 18 have an essentially curved shape, in particular - as can be seen in Figures 2 and 3 - in diametric cross section they have a concavity facing the second body 15.

[0061] The second openings 19 are advantageously placed at the first openings 18; in other words, they are arranged so that a pair of them is placed at the radial ends of a first opening 18, thus defining the above-mentioned channel 17.

[0062] The second openings 19 preferably comprise a first plurality of openings 19' and a second plurality of openings 19" defining different passage cross sections through the second body 15.

[0063] Specifically, the first plurality of openings 19’ has a larger cross section than the second plurality of openings 19”; between them, the openings of each plurality of openings 19', 19” have the same shape.

[0064] A better view can be seen in Figures 4A to 5B where the different passage cross sections and the equality of the openings of each plurality of openings 19', 19" can be seen.

[0065] In the embodiment illustrated, the second openings 19 have the shape of a slot elongatedcircumferentially with respect to the axis A.

[0066] Additionally, the openings of the first plurality of openings 19' are placed alternately with the openings of the second plurality of openings 19”. In particular, each opening of a plurality is placed between two openings of the other plurality, with the exception of the first and last of the series.

[0067] Additionally, it can be seen that a portion 15' of the second body 15 between the openings of the first and second plurality of openings 19', 19" has a reduced thickness, that is, it does not extend as far along the axis A than the remaining portion of the body 15.

[0068] Consequently, the first and second plurality of openings 19', 19" are fluidically connected to each other since the portion 15' is spaced apart from the axis A by the filter material 16.

[0069] Advantageously, the second plurality of openings 19" has, at the surface in contact with the filter material 16, a groove 15" having a shape apt to define an inlet for the blow-by flow in the channel 17. In particular, this groove 15” is essentially linear.

[0070] Referring to Figures 4A to 5B, the channels 17, that is, the first openings 18 in the first body 14 and the second openings 19 in the second body 15 extend radially with respect to the rotation axis A.

[0071] Specifically, they are circumferentially spaced apart and, advantageously, equally spaced apart. There are nine channels in the embodiment described.

[0072] Advantageously - as can be seen in Figures 5A-5B, the channels 17 can be arranged in a spiral around the axis A. In the embodiment illustrated, the direction of the spiral is, advantageously, the same as the direction of rotation of the separator 1.

[0073] The spiral arrangement of the channels 17 allows the length of the channels 17 to be increased in a radial direction.

[0074] Returning to the at least one opening 20, the separator 1 comprises multiple openings 20 made in the radial wall 2a” at the lower cover 2b and the filter material 16.

[0075] In particular, the openings 20 are circumferentially spaced apart and advantageously equally spaced apart from each other. In the embodiment described, they are advantageously quadrangular in shape.

[0076] Alternatively, the openings 20 can be grouped together in groups of openings 20 spaced apart, for example in groups of two by two or three by three.

[0077] As can be seen in Figure 6, where there is no opening, the radial wall 2a prevents fluidic communication of the filter material to the outside.

[0078] In the alternative embodiment of Figures 7 and 8, the separator 1 comprises at least one shutter portion 21 configured to partially occupy the at least one opening 20 to reduce its passage.

[0079] Consequently, if more than one opening 20 is provided, as many shutter portions 21 are provided. Specifically, as can be seen in Figures 7 and 8, these shutter portions 21 are supported by the second body 15, advantageously consisting of one piece with it.

[0080] In the illustrated embodiment, these shutter portions 21 are radial flanges extending froma radial edge of the second body 15 and sized to accommodate the respective opening 20 while leaving at least one gap 22 with a smaller cross section than the opening 20.

[0081] In the case described, the shutter portions 21 leave three circumferentially spaced gaps 22 free that are identical to each other around the axis A.

[0082] Advantageously, the separator 1 comprises multiple closing means 23 configured to connect the upper cover 2a to the lower cover 2b.

[0083] Specifically, these closing means 23 are circumferentially spaced apart and, advantageously, equally spaced apart.

[0084] In particular, the closing means 23 may comprise at least one appendage 24 extending axially from one of either the upper cover 2a or the lower cover 2b.

[0085] In the embodiment illustrated, the appendages 24 extend from a terminal edge of the upper cover 2a.

[0086] Specifically, each appendage 24 comprises at least one tooth 25 configured to snap into place with at least one seat 26 made in the other of either the upper cover 2a or the lower cover 2b.

[0087] Specifically, these seats 26 are made in the lower cover 2b, which, if necessary, extends radially beyond the upper cover 2a.

[0088] Returning to the first body 14, this comprises a central portion 14' and a peripheral portion 14" radially external to the central portion 14'.

[0089] In particular, the channel 17 described above is made in the peripheral portion 14".

[0090] The central portion 14' comprises a shaped profile 27 configured to optimise the flow of air flowing to and from the channel 17 through the inlets and outlets 6, 7.

[0091] Advantageously, the shape of this profile is wing-like.

[0092] More specifically, the shaped profile 27 comprises a first portion 27' facing the inlet 6 and a second portion 27" facing the outlet 7.

[0093] Advantageously, the firstand second portions 27', 27" have an axisymmetric shape around the axis A. Additionally, they each have a convex shape towards the respective opening 6, 7, preferably a bell / bell-curve shape.

[0094] Advantageously, the first and the second bodies 14, 15 each consist of a single piece. Advantageously, at least the outlet 7 can be provided with sealing means 28 such as rotating sealing means such as an o-ring.

[0095] Referring to Figures 9 and 10, another embodiment of the separator 1 is shown, which has a similar structure to that described except for the following.

[0096] Note how the same reference numbers indicate similar elements between this and the previous embodiment, which will not be described again for brevity's sake.

[0097] In particular, in this embodiment, the channel 17 has a labyrinthine path defining only two reversals of motion.

[0098] In the embodiment described, the first openings 18 have an essentially curved shapehaving a concavity facing the second body 15 and a much larger radius of curvature than in the first embodiment.

[0099] Additionally, the first body 14 has an annular shape, that is, it does not comprise a central portion but is hollow in that space.

[0100] Advantageously, the separator 1 comprises a tubular element 29 housed between the inlet and outlets 6, 7 and fitted within the first body 14.

[0101] Advantageously, this tubular element 29 may consist of one piece with the lower cover 2b. Unlike the first embodiment described above, the lower cover 2b comprises a shoulder 2d configured to only partially contain the filter material 16 on the side opposite the at least one opening 20.

[0102] In other words, the filter material 16 is partially isolated from the outside by the shoulder 2d along a first circumferential section; the remaining portion is directly in fluidic communication with the inlet 6.

[0103] Advantageously, the tubular element 29 is configured to convey the filtered blow-by mixture flowing from the channel 17 to the outlet 7.

[0104] In particular, the tubular element 29 defines a space 30 and comprises a first portion 29' and a second portion 29”.

[0105] In particular, the first portion 29' is connected to the lower cover 2b and the second portion 29" is provided on the opposite side of it along the longitudinal axis A, that is, housed in the outlet 7.

[0106] In particular, the second portion 29" comprises a plurality of openings 31 configured to fluidically connect the outlet 7 of the separator 1 to the channel 17 and thus via it to the inlet 6.

[0107] Specifically, the openings 31 are circumferentially spaced apart and, advantageously, equally spaced apart and are preferably circular in shape and equal in shape to each other.

[0108] These openings 31 are preferably shaped like nozzles in order to accelerate the flow passing through them.

[0109] Advantageously, the space 30 is fluidically isolated from the inlet 6, that is, the first portion 29' is configured to cooperate tightly with an element of the engine system, not further illustrated for brevity.

[0110] In addition to what has been described and with reference to Figures 11 and 12, further embodiments of the separator 1 are illustrated in Figures 9 and 10, which have a similar structure to that described in the second embodiment except for the following.

[0111] Note how the same reference numbers indicate similar elements between this and the previous embodiment, which will not be described again for brevity's sake.

[0112] Advantageously, as illustrated in Figures 11 and 12, the tubular element 29 has a conical profile with a diameter progressively decreasing from the first portion 29' towards the second portion 29".

[0113] In particular, the tubular element comprises a wall 32 transverse to the longitudinal axis Aof the separator 1 and extending within the space 30 along at least part - and, in particular, the entire - inner circumference of the latter.

[0114] Advantageously, the wall 32 is configured to obstruct at least part - and, in particular, all -of the internal section of the space 30 so as to fluidically separate the first portion 29' from the second portion 29”.

[0115] Specifically, this wall 32 may consist of one piece with the tubular element 29.

[0116] The separator 1 also comprises sealing means 33 configured to prevent contamination of the filtered gaseous portion with the blow-by flow during rotation of the separator 1 itself.

[0117] The sealing means 33 can be either radial 33' (illustrated in Figure 11) or axial 33" (illustrated in Figure 12). Both the radial and axial sealing means 33', 33" each comprise at least one contact surface 34’, 34” apt to exert a fluidic seal depending on their orientation with respect to the axis A.

[0118] The radial and axial sealing means 33’, 33” are preferably designed to cooperate with a complementary surface of other engine components, such as additional sealing elements, to create the radial or axial seal.

[0119] Advantageously, these sealing means may comprise elements such as o-rings or rotating seals.

[0120] As illustrated in Figure 11 , in the case of the radial sealing means 33', each contact surface 34' is arranged parallel to the axis A.

[0121] Advantageously, the radial sealing means 33' are configured to be mechanically fitted on and fixed to the annular wall 8 of the cover 2a in such a way as to be integral with the rotation of the cover 2a, thus with the rotation of the separator 1 , with respect to the axis A.

[0122] Specifically, the radial sealing means 33’ also comprise a coupling surface 35’ in contact with the annular wall 8.

[0123] For example, the radial sealing means 33' may be attached to the outer surface of the annular wall 8 of the cover 2a by gluing, by interference fit or by interlocking fit between teeth (not illustrated) of the radial sealing means 33' and the respective interlocking seats (not illustrated) cut in the upper cover 2a and / or other equivalent systems.

[0124] As illustrated in Figure 12, in the case of the axial sealing means 33”, each contact surface 34” is arranged perpendicularly to the axis A.

[0125] In particular, the separator 1 comprises an annular wall 8 that has a longitudinal extension along the axis A that is smaller than the annular wall 8 described in the previous embodiments.

[0126] In other words, the second portion 29" of the tubular element 29 comprises a section housed within the outlet 7 and a section extending beyond that outlet 7 along the axis A.

[0127] Specifically, the axial sealing means 33" also comprise a coupling surface 35" placed in contact with a section of the tubular element 29 and a support surface 36 placed in contact with the edge of the annular wall 8.

[0128] Advantageously, the axial sealing means 33” are configured to be mechanically fittedand / or fixed to a section of the tubular element 29 so as to be integral with the rotation of the separator 1 , with respect to the axis A.

[0129] In this case too, the axial sealing means 33" can be attached to the edge of the annular wall 8 and / or the tubular element 29 section by gluing, interference fit and / or other equivalent systems.

[0130] The operation of the separator 1 described above according to the invention is the following.

[0131] With reference to Figure 2 / 3, the blow-by flow F enters through the inlet 6. Here, the blowby flow, due to the rotation and centrifugal force of the separator 1 , tends to be sucked following the labyrinthine channel 17 where it undergoes numerous reversals in direction, hitting the filter material 16. These reversals and their impacts facilitate the separation of oil from the gaseous portion, so that the oil is collected in the filter material 16. In particular, the rotation and changing diameter of the channel 17 allows the blow-by flow to be accelerated, reducing the pressure drop and thus forcing the oil to be filtered. The filtered gaseous portion thus flows towards the outlet 7 while the oil by centrifugal effect tends to flow out from at least one opening 20.

[0132] In particular, the channels 17 are arranged in a spiral; the centrifugal effect is further increased.

[0133] In particular, if there are several openings 20, the oil will tend to only flow out through them, preventing it from being sucked back in via return suction.

[0134] In particular, if provided with a shaped central portion, the blow-by flow tends to flow with less pressure drop coming in and out of the channel 17, thus improving the efficiency of the separator 1.

[0135] In the embodiment in Figures 9, 10, 11 and 12, the operation is similar except that part of the blow-by also flows directly through the filter material, bypassing the channel 17.

[0136] The special cases described for the operation of the first embodiment apply to the one above, where possible.

[0137] From the above, the advantages of a rotating separator 1 according to the invention are clear.

[0138] The composition of the filter assembly with only two support bodies defining the channel and a fleece-type filter material, that is, an impactor, allows for savings in cost and space while maintaining high efficiency.

[0139] In particular, since the blow-by flow is not filtered but simply hits the fleece, pressure drops are significantly reduced.

[0140] In particular, this is even more so when the filter material is indirectly isolated from the inlet, that is, it is only flu idically connected to it via the channel.

[0141] In particular, the use of a first body having a moulded shape or, alternatively, the tubular element provides a particular reduction in pressure drops and consequent increase in separator efficiency.The provision of several openings with reduced cross sections and the presence of a wall separating the internal space into two distinct, fluidically isolated portions prevents the suction of oil into the gaseous portion of the blow-by as it exits the channel, thus maintaining the separator's high filtering power.

[0142] Additionally, the radial / spiral arrangement of a large number of ducts allows fora reduced footprint while providing high suction capacity.

[0143] Again, this is increased by the integration of fastening means in the cover portions that limit the space of the openings 20.

[0144] The shape and layout of the channel 17 path are such as to generate speed increases and sudden changes of path of the blow-by mixture, encouraging the separation of the oil from the gaseous portion.

[0145] The presence of the radial 33' and axial 33" sealing means reduces wear due to contact between the annular wall 8 and other engine components during rotation when speed and pressure are high.

[0146] Therefore, only the radial sealing means 33' and not all parts of the separator 1 in contact with the other engine components can be made of a material suitable for wear resistance, making the construction of the separator 1 more economical. Advantageously, the use of the radial and axial sealing means 33', 33" permits greater tolerance to eccentricity, flatness and misalignment errors between the coupling surfaces 35', 35" and / or contact surfaces 34', 34" and the complementary surfaces against which these radial and axial sealing means 33', 33" exert pressure.

[0147] It is evident how recovering the oil in the exhaust gases reduces the engine's oil consumption and the need for frequent top-ups.

[0148] In addition, oil recovery and filtration help reduce pollutant emissions, help maintain optimal engine lubrication, and protect the system from wear and tear, extending its service life.

[0149] The proposed system is also less bulky in the axial direction along the axis A and therefore compact and easier to install and replace.

[0150] The compact design of the rotating separator 1 reduces the weight of the system and improves engine performance.

[0151] In addition, the rotating separator 1 can be adapted to different types of engines and applications, thanks to its modularity and the possibility of customising the configuration of the components.

[0152] Finally, it is clear that changes may be made to the separator 1 , and variations produced thereto, according to this invention that, in any case, do not depart from the scope of protection defined by the claims.

[0153] For example, it is clear that the shape of the casing 2 may be different, just as the covers 2a, 2b may couple along the transverse axis B and not the longitudinal axis A.

[0154] The clamping means 10 can also be replaced by elements having the same function.Also, according to an embodiment not illustrated, the spiral could have a direction different to the direction of rotation of the separator 1.

[0155] Again, it is clear that the openings of the channel 17, openings 20, the mechanical couplings described or their number can be varied as long as they are within the limits claimed below.

[0156] Clearly, there may be additional mechanical elements such as seals, screws or other elements that are necessary and obvious in terms of construction and not further described for brevity’s sake.

Claims

CLAIMS1 A rotating separator (1) for the separation of a blow-by flow, comprising a casing (2) configured to define a housing (3), an inlet (6) and an outlet (7) both defined along a longitudinal axis (A) of said casing (2), said casing (2) being connected to a torque source capable of rotating said separator (1) around said axis (A),said separator (1) comprising a filter assembly (4) housed inside said housing (3) and integral with said casing (2) and comprising a first body (14) and a second body (15) configured to axially maintain a filter material (16) with respect to said casing (2) by impact, characterized in that said first body (14) is annular and comprises a tubular element (29) housed between said openings (6,7) and said first body (14), said tubular element (29) defining a space (30), said space (30) defining openings (31) connecting said space (30) with said outlet (7).2.- The rotating separator according to claim 1 , wherein said tubular element (29) comprises a first and a second portion (29’, 29”), wherein said first portion (29’) is isolated from said inlet (6).3.- The rotating separator according to one of the preceding claims, wherein said filter material (16) is partially fluidically connected to said inlet (6).4.- The rotating separator according to one of the preceding claims, wherein said filter assembly (4) comprises a channel (17) configured to connect fluidically said inlet (6) to said outlet (7).5.- The rotating separator according to one of the preceding claims, wherein said inlet (6) is fluidically connected in parallel through said channel (17) and said filter material (16) to said outlet (7).6.- The rotating separator according to one of the preceding claims, wherein said tubular element (29) has a conical profile with a decreasing diameter starting from said first portion (29') towards said second portion (29").7.- The rotating separator according to one of the preceding claims, wherein said tubular element (29) comprises a wall (32) arranged in said space (30) transversely to said axis (A), wherein said wall (32) is configured to obstruct the entire inner section of said space (30) so as to fluidically separate said first and second portions (29', 29").8.- The rotating separator according to one of the preceding claims, wherein said casing (2) defines a plurality of openings (20) configured to allow fluidic communication of said filter material (16) with the external environment.9- The rotating separator according to one of the preceding claims, wherein said casing (2) comprises an upper cover (2a) and a lower cover (2b) configured to be connected to define said housing (3),wherein said upper cover (2a) comprises an axial wall (2a') and a radial wall (2a”) extending perpendicularly towards said lower cover (2b) from one end of said axial wall (2a').10.- The rotating separator according to claim 9, wherein said upper cover (2a) comprises said openings (20) made in said radial wall (2a”) of said upper cover (2a) at said lower cover (2b) and said filter material (16).11 The rotating separator according to one of the preceding claims, wherein said upper cover (2a) comprises an annular wall (8) extending perpendicularly around the edge of said outlet (7) from said axial wall (2a’).12.- The rotating separator according to one of the preceding claims, comprising sealing means (33) configured to prevent contamination of the filtered gaseous portion with the blow-by flow during rotation of said separator (1),wherein said sealing means (33) are radial (33') or axial (33").13.- The rotating separator according to claim 12, wherein said radial and axial sealing means (33', 33") each comprise at least one contact surface (34, 34') designed to exert a fluidic seal depending on their orientation with respect to said axis (A).14.- The rotating separator according to claim 12 or 13, wherein said contact surface (34) of said radial sealing means (33') is arranged parallel to said axis (A).15.- The rotating separator according to claim 12 or 13, wherein said contact surface (34') of said axial sealing means (33") is arranged perpendicularly to said axis (A).

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