WO2009147336A2 - Decanteur d'huile pour moteur a combustion interne - Google Patents
Decanteur d'huile pour moteur a combustion interne Download PDFInfo
- Publication number
- WO2009147336A2 WO2009147336A2 PCT/FR2009/050824 FR2009050824W WO2009147336A2 WO 2009147336 A2 WO2009147336 A2 WO 2009147336A2 FR 2009050824 W FR2009050824 W FR 2009050824W WO 2009147336 A2 WO2009147336 A2 WO 2009147336A2
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- WIPO (PCT)
- Prior art keywords
- oil
- decanter
- chamber
- gases
- orifice
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M2013/0038—Layout of crankcase breathing systems
- F01M2013/005—Layout of crankcase breathing systems having one or more deoilers
- F01M2013/0061—Layout of crankcase breathing systems having one or more deoilers having a plurality of deoilers
Definitions
- the present invention relates to an oil decanter for an internal combustion engine, adapted to at least partially separate the oil from the gases leaving a crankcase of an internal combustion engine.
- an outlet chamber for decanted gases at least one intermediate suction chamber located between the intake chamber and the gas outlet chamber and delimited by oil collecting means positioned on the flow path between the inlet chamber and the gas outlet chamber; intake chamber and the gas outlet chamber, and
- an oil recovery chamber in which a decanting oil return orifice is provided towards the engine, said orifice being situated at the bottom of the decanter, said oil recovery chamber being adjacent to the chamber or chambers of oil; intermediate suction, said or each intermediate suction chamber being in communication with said oil recovery chamber via communication means, and said recovery chamber being in communication on the one hand with the gas inlet chamber via communication means, and secondly with the output chamber via a communication interface between the two said chambers.
- Figures 1 and 2 schematically illustrate the problem underlying the present invention, namely the loading of oil sump gases inside an internal combustion engine, for example of the gasoline engine type or engine diesel, intended in particular for equipping a motor vehicle.
- FIG. 1 schematically represents, in vertical section, a portion of an internal combustion engine M comprising, in a conventional manner, a crankcase 900 containing a crankshaft 901 which cooperates, via rods 902, with pistons 903 slidably mounted. in the cylinders 904.
- the crankshaft 901 is lubricated with a lubrication oil H extended in the crankcase 900.
- Spotter plates 905 can also be provided in the crankcase 900.
- a rod shaft 910, mounted inside a cylinder head 911, is also provided for actuating valves, not shown, one or more chimneys 912 communicating the crankcase 900 and the cylinder head 91 1.
- nozzles 913 may be provided inside the cylinder head 911 for spraying lubricating oil H on the camshaft 910, in particular on the bearings 914 of said camshaft 910.
- crankcase gases are illustrated in FIGS. 1 and 2 by the arrows visible inside the crankcase 900, the chimney 912 and the cylinder head 911.
- fuel gases The combustion and compression of each cylinder 904 passes from the cylinder to the crankcase 900, the piston segments 903 not completely stopping the gases.
- gases consist mainly of a mixture of air, fuel, a little exhaust gas, water vapor and lubricating oil. They are removed from the crankcase 900, to be introduced again into the combustion chambers defined by the cylinders 904.
- the crankcase 900 is connected to the cylinder head by the chimneys 912 traversed by these gases, and then these gases are admitted into an oil separator 920, otherwise known as an oil separator, designed to separate the oil from the gases leaving the crankcase 900 via the cylinder head 911.
- an oil separator 920 otherwise known as an oil separator, designed to separate the oil from the gases leaving the crankcase 900 via the cylinder head 911.
- the decanted gases reach the intake line 930, passing through the beforehand by a valve 931 and a butterfly flap 932; the valve 931 closing particularly when the depression downstream of the butterfly flap 932 is important.
- the gases can be returned to the cylinder head 910, so in the cylinders 904 after separation of the oil from the gas in the decanter 920.
- the decanter 920 is an essential element of the internal combustion engine M which is inserted in the flow path of the crankcase gases in order to separate the gases from the lubricating oil in order to reinject the gases into the line 930 admission.
- crankcase gases are capable of being charged with oil H at different points of their trajectory, in particular: the cylinders 904 where the movement of the pistons 903 tears off the internal walls of the cylinders of the oil which charges the gases; the rods 902 which come into contact with the oil layer, thus forming droplets of oil in suspension;
- crankshaft 901 which projects oil into the gas flows
- the bearings 914 or the chimneys 912 whose upper parts represent zones of accumulation of oil particles that can be torn off and mixed with the crankcase gases, in spite of flared or rounded shapes designed to facilitate the descent of the oil.
- the oil arriving in the decanter can be mainly in one of two phases:
- liquid phases of oil corresponding to oil inputs in the form of successive oil waves, large drops or jets; and aerosol phases of oil, corresponding to small amounts of oil in the form of small drops in suspension in the gases.
- a main compartment 840 in which a settling oil return orifice 841 is provided towards the engine, said return orifice 841 being situated at the bottom of the settling tank and forming the inlet of a siphon 842,
- Venturi 880 Just upstream of the outlet chamber 830 is formed a Venturi 880 which communicates with the main oil recovery compartment 840 via a vacuum port 881 of said main compartment.
- the intermediate suction chamber 853 located directly upstream of the outlet chamber 830 is thus extended by the Venturi 880 and communicates with the main compartment 840 via the communication orifice.
- the intake chamber 820 is in communication with the first intermediate compartment 843 via a communication orifice 845.
- the first intermediate compartment 843 is in communication with the second intermediate compartment 843.
- said intermediate compartment 843 is in communication with the main compartment 840 adjoining via the communication port 846.
- the siphon 842 has the role of passing the oil from the main compartment 840 to an outer zone of the decanter in communication with the engine, especially inside the cylinder head above which said decanter is disposed; the main compartment 840 being in depression with respect to said outer zone.
- this pressure difference ⁇ P is determined in particular by the height Hs of the siphon 842, where the higher this height Hs is and the greater the pressure difference ⁇ P can be important.
- This pressure difference ⁇ P is related to the gas velocities in the decanter: the higher the velocity and the greater the pressure loss ⁇ P, the higher the height Hs of the siphon 842 must be to return the oil H to the engine .
- This type of decanter is intended to continuously remove all or part of the oil present in the crankcase gases. Assuming that the settling tank is sized so as not to treat the small drops of oil, that is to say to perform a separation of the oil from the gases than from a predetermined size of the particles of oil found in the gases, it has nevertheless been found that this type of decanter no longer works when an oil wave or successive waves of oil arrive at the entrance of the decanter; a wave of oil corresponding to a large flow of oil into the decanter following, in particular, the take-off of oil previously accumulated in accumulation zones as described above.
- the reduction of the available space has repercussions on all the elements of the engine and in particular on the space available for the distribution.
- the camshaft and the cams are closer and closer to the decanter inlet and the crankcase gas velocities increase, in particular due to the reduction of the gas passage sections and the increase of the flow rate.
- the amounts of oil lubricating these elements are increased.
- the Applicant has noticed that the largest amount of oil arriving at the entrance of the decanter arrives in the form of large drops, jets and waves, while the oil in the form of small drops comes in small quantities.
- the oil flow in the form of small drops arriving at the inlet of the settler is of the order of 4 g / h, while the flow rate of oil arriving in the form of large drops, jets or waves is of the order of 1200 g / h.
- the oil H tends to clog the orifices 845 and 871.
- the incoming oil wave is indeed a first time separated by the first obstacle separator 861 and the orifice 871 will evacuate the largest part of this wave, by momentarily closing at passage of the oil.
- the oil will momentarily plug said orifice 845 so that, and also because the velocity of the gases in the Venturi 880 increases, the pressure P2 decreases in the main compartment 840.
- the same phenomenon also occurs when the oil passes through the following orifices, namely the orifices 846 and 872, then into the last orifice 873 with diminished effects because the quantity of oil decreases after each row of separator at 862, 863.
- Such oil waves H have the effect that the pressure P2 decreases in the main compartment 840, so that the pressure drop ⁇ P increases, so that the oil height HH increases and the level of H oil rises in the main compartment 840.
- the siphon 842 no longer has a period of emptying.
- the main compartment 840 fills up completely and the oil H ends up passing through the vacuum opening 881 between the main compartment 840 and the Venturi 880.
- the successive passage of large quantities of oil H into the orifices successive 845, 846, 871, 872, 873 creates pressure instabilities in the main compartment 840, and thus instabilities of the siphon 842 which can defuse.
- the siphon 842 can defuse, that is to say that gas, in the form of bubbles B illustrated in Figure 7, passes through the siphon 842.
- the defusing or squatting siphon 842 will therefore produce gas bubbles B which will burst at the level of the free oil surface H in the main compartment 840, creating droplets of oil likely to be entrained by the gases flowing in the main compartment 840 in the admission line.
- the orifices, and in particular the most upstream orifices 845 and 871 are the most big possible to avoid being clogged by the oil.
- the gas flow is then little disturbed by the presence or absence of the oil at the various orifices 845, 846, 871, 872, 873.
- the gas flow flows in the orifices 871, 872 and 873 will be oriented in the wrong direction, that is to say from the oil recovery chamber 840 to the intermediate suction chambers, and no oil will be sucked through these orifices 871, 872, 873.
- the orifice 871 is very large, as illustrated in FIG. 9 (in the absence here also of an intermediate compartment), this orifice 871 will create very little pressure drop so that the pressure P11 in the first intermediate suction chamber 851 will be equal to the pressure P2 in the main compartment 840 forming the oil recovery chamber.
- the pressures P1 2 and P13 respectively in the following intermediate suction chambers, respectively 852 and 853, and the pressure P8 in the Venturi 880 will all be lower than the pressure P1.
- the gas flow streams in the orifices 872 and 873 will be oriented in the wrong direction, that is to say from the oil recovery chamber 840 to the corresponding intermediate suction chambers 852 and 853, and no oil will be sucked through these orifices 872, 873.
- the orifice 845 should be smaller than the orifice 871, itself smaller than the orifice 872, itself smaller than the orifice 872 etc. so that these orifices have the same suction flow. Nevertheless, this problem is particularly difficult to adjust on the last communication port 873, especially when the height of the siphon 842 is small because limited for reasons of space.
- This type of decanter thus has the disadvantage of not being able to satisfactorily treat both cases, namely: the liquid phases of oil corresponding to oil inputs in the form of successive oil waves, large drops or jets; and aerosol phases of oil, corresponding to small amounts of oil in the form of small drops in suspension in the gases.
- the narrowing of the circulation zone of the gases forming the Venturi is a difficult and expensive area to produce by molding a plastic material, and also offers a zone of less robustness in the decanter, vis- for example against shocks on the clarifier.
- the present invention is intended in particular to eliminate all or some of the aforementioned drawbacks, in particular by allowing the efficient treatment of the oil in liquid phase, and proposes for this purpose an oil decanter for internal combustion engine, designed to separate at the least partially the oil of the gases leaving a crankcase of an internal combustion engine, the decanter comprising a casing internally enclosing:
- an outlet chamber for decanted gases at least one intermediate suction chamber located between the intake chamber and the gas outlet chamber and delimited by oil collecting means positioned on the flow path between the inlet chamber and the gas outlet chamber; intake chamber and the gas outlet chamber, and
- an oil recovery chamber in which a decanting oil return orifice is provided towards the engine, said orifice being situated at the bottom of the decanter, said oil recovery chamber being adjacent to the chamber or chambers of oil; intermediate suction, said or each intermediate suction chamber being in communication with said oil recovery chamber via communication means, and said recovery chamber being in communication on the one hand with the gas inlet chamber via communication means, and secondly with the outlet chamber via a communication interface between the two said chambers, the decanter being remarkable in that the communication interface between the oil recovery chamber and the chamber of the outlet of the gases is dimensioned so that the pressures in each of said chambers are substantially equal during the use of the clarifier independently of flow rate of the gas flow inside said decanter.
- the invention therefore proposes to eliminate the narrowing of the circulation zone of the gases forming the Venturi and to establish a pressure balance between the outlet chamber and the oil recovery chamber.
- the pressures in the outlet chamber and in the oil recovery chamber are equal, so that if oil waves clog the communication ports, the pressure in the oil recovery chamber just above the oil return port, does not change.
- the pressure in the oil recovery chamber is thus independent of the arrival or not of waves of oil, preventing waves Successive oil spills create pressure instabilities in the clarifier and operating instabilities, such as defusing the siphon.
- the communication interface between the oil recovery chamber and the gas outlet chamber is in the form of an elevation, in particular of the walking type, associated with a difference in levels between the respective bottoms of said chambers to prevent oil accumulating in the oil recovery chamber from passing into the gas outlet chamber via said communication interface.
- the settling tank comprises a plurality of successive intermediate suction chambers separated from one another by oil collecting means.
- the oil recovery chamber comprises several successive compartments, in communication via communication means, including: a main compartment in which the decantation oil return orifice is provided, and
- At least one intermediate compartment located between the gas inlet chamber and the main compartment, each compartment being adjacent to at least one suction chamber with which it is in communication via communication means.
- the single intermediate suction chamber or the intermediate suction chamber directly upstream of the outlet chamber is in communication with said outlet chamber via a convergence zone intended to concentrate the flow of gas flow.
- a convergence zone intended to concentrate the flow of gas flow.
- the flow of gas passing through the intermediate suction chamber or chambers does not disturb the oil recovery chamber or its main compartment, and more particularly the settling oil return orifice.
- the main flow of gas does not disturb the pressure in the oil recovery chamber or in the main compartment.
- the convergence zone is in the form of a wall inclined on the horizontal, oriented towards the upper part of the decanter in the flow direction of the gas flow.
- This inclined wall preferably forms a connecting wall between the bottom of the outlet chamber and the bottom of said intermediate suction chamber when said funds are not located at the same level.
- all or part of the communication means comprise at least one orifice provided between the two compartments or corresponding chambers in communication.
- all or part of the communication means comprise at least two orifices provided between the two compartments or corresponding chambers in communication, said orifices being situated at different levels so that an orifice situated at the bottom of the decanter is dedicated mainly to at the passage of the oil and an orifice located in the upper part of the decanter is dedicated mainly to the passage of gases.
- the oil recovered by the capture means flowing mainly by gravity will tend to pass into the oil recovery chamber, or into one of its compartments, via the hole located at the bottom; while the gases will tend to go into the oil recovery chamber, or into one of its compartments, via the hole located in the upper part.
- successive oil waves or large drops that is to say the oil in the liquid phase and not in the aerosol phase, flow mainly in the lower part of the decanter, corresponding to the floor of the decanter, and therefore pass mainly through the or holes in the lower part, thus limiting the risk of clogging the gas flow holes located in the upper part, and create instability of the decanter operation.
- up and down refers to the vertical direction associated with the force of gravity and the position of use of the decanter mounted in the motor vehicle.
- the decantation is a mechanical separation operation, under the main action of gravity, several immiscible phases.
- the communication means in the form of orifices at the top and bottom, could be subject to protection stricto sensu.
- the two orifices correspond to free spaces between a partition wall of the two compartments or corresponding chambers and the decanter housing, said partition wall being mounted with clearance inside said housing, in particular by a clipping assembly.
- the walls defining the chambers and / or the compartments of the oil recovery chamber may have a height less than the height of the decanter housing, so that said walls are mounted with games, respectively lower and upper, the level of the parts, respectively lower and upper, of the decanter housing, so that these games form passage holes for the oil and for the gas respectively in the lower and upper part of the decanter.
- said or each orifice is of oblong shape, in particular of rectangular shape, or of square shape.
- said or each orifice is in the form of a plurality of holes, in particular holes of polygonal shape, preferably rectangular or square, or circular.
- the first communication ports to the oil recovery chamber are of interest to be of small size to create the loss of oil. charge, so that the following openings can suck the oil to the oil recovery chamber.
- the communication ports must allow the oil to pass as easily as possible, and therefore be large. Hence a certain contradiction as mentioned above.
- the Applicant has noted that the flow of gas through the communication ports is of the turbulent type (the Reynolds number of this fluid being of the order of 6000), whereas the flow of the oil through these same orifices is of the laminar type (very low flow rate, high viscosity and high density of this fluid).
- the shape of the orifice has a lot of influence on the pressure drop, whereas for a laminar flow the shape of the orifice has very little, only the passage section is important.
- an advantageous form of the communication orifices is a shape that maximizes the pressure drop of a turbulent flow, corresponding to the flow of gases. Indeed, for the same section or passage area, corresponding to the same capacity to remove oil in laminar flow, the shape that maximizes the pressure drop in turbulent flow is the one that better stop the gas.
- S surface or passage area of the orifice
- P perimeter of the orifice passage section
- an orifice with an oblong shape in particular an elongated rectangular shape, has a passage surface greater than that of a circular orifice.
- the orifice of rectangular or square shape and of the same hydraulic diameter Dh has a passage surface Sr which is greater than the passage surface Sc of the circular orifice.
- the orifice of the same hydraulic diameter Dh and formed of five square holes also has a passage surface Sm which is greater than the passage surface Sc of the circular orifice.
- all or part of the oil collection means comprise an obstacle separator, said obstacle separator comprising at least one gas passage orifice associated with deflection means arranged opposite said passage orifice for deflecting all or part of the gas passing through said passage orifice.
- the decanter operates primarily for the treatment of the oil in the liquid phase, with low gas flow velocities and low pressure losses in order to be able to discharge the oil continuously through the siphon.
- Such a decanter thus makes it possible to treat the largest quantity of oil arriving at the inlet because, as already described above, the oil arrives mainly in the form of large drops, jets and waves; the oil arriving in the form of small drops, in the aerosol phase, arrives in small quantity.
- the successive oil collecting means provided between the successive intermediate suction chambers each comprise an obstacle separator, two successive obstacle separators, respectively a first separator and a second separator placed downstream of the first separator, being designed so that the first separator deviates less gas flow than the second separator.
- the first separator creates less pressure drop than the second separator.
- the oil collection means provided between the gas inlet chamber and the intermediate suction chamber situated directly downstream comprise at least one gas passage orifice.
- no gas deflection means is provided upstream of said passage opening.
- the invention also relates to an oil decanting device for an internal combustion engine, designed to at least partially separate the oil from the gases leaving a crankcase of an internal combustion engine, comprising a decanter as described. above and a cyclone separator placed behind downstream of said decanter to recover all or part of the oil remaining in the gases leaving said decanter.
- the decanter is intended to process mainly the liquid phase oil inlets, constituting the largest quantity of oil inlets in the device, while being particularly compact, robust and inexpensive.
- the function of this decanter is therefore no longer to have an exhaust gas completely freed of oil, but to have a gas where only a small amount of oil remains in the form of small particles in suspension then treated by the cyclone separator placed at the outlet of said decanter.
- the cyclone separator which requires much more pressure drop to treat the oil in the aerosol phase, can instead store the treated oil during the operating life of the combustion engine, before the oil is discharged into the engine. when the engine is stopped, for example via a suitable valve.
- the cyclone separator treating a small amount of oil can therefore have dimensions adapted to the bulk inherent in the engine block.
- the cyclone separator comprises a tangential inlet of the gas containing oil to be recovered, said tangential inlet communicating directly with the gas outlet chamber of the clarifier.
- FIG. 1 is a schematic vertical sectional view of an internal combustion engine portion may be equipped with a decanter or a settling device according to the invention
- FIG. 2 is a schematic vertical sectional view of the cylinder head of the internal combustion engine illustrated in Figure 1 at the inlet of the decanter;
- FIGs 3 and 4 are schematic horizontal sectional views of two decanters of the state of the art;
- FIG. 5 is a vertical sectional view of the decanter illustrated in Figure 4 along the line V-V;
- - Figure 6 is a view identical to that of Figure 4 where oil waves are illustrated inside the decanter;
- FIG. 7 is a vertical sectional view of the decanter illustrated in Figure 6 along line VII-VII in a situation of instability due to oil waves;
- FIGs 8 and 9 are schematic horizontal sectional views of two variants of the decanter illustrated in Figure 4 illustrating the problem of sizing the orifices to treat the oil waves;
- FIG. 10 is a schematic horizontal sectional view of a first embodiment of a settler according to the invention
- - Figure 11 is a vertical sectional view of the decanter illustrated in Figure 10 along the line Xl-Xl;
- FIG. 12 is a schematic horizontal sectional view of a second embodiment of a settler according to the invention.
- FIG. 13 is a vertical sectional view of the settler illustrated in Figure 12 along line XIII-XIII;
- FIG. 14 is a schematic horizontal sectional view of an obstacle separator adapted to equip a decanter according to the invention.
- FIGS. 15a, 15b and 15c schematically illustrate three types of communication orifice between chambers or compartments provided in a decanter according to the invention
- Figure 16 is a view identical to that of Figure 12 where an oil wave is illustrated inside the decanter;
- Figures 17a and 17b are vertical sectional views of two variants of the decanter illustrated in Figure 16 along the line XVII-XVII;
- FIGS. 18 to 20 are schematic views in horizontal section of three other embodiments of a settler according to the invention.
- FIG. 21 is a schematic horizontal sectional view of a decanting device according to the invention comprising a decanter in series with a cyclone separator;
- FIG. 22 is a vertical sectional view of the cyclone separator illustrated in FIG. 21 along the line XXII-XXII.
- FIG. 10 A first embodiment of a decanter 1 according to the invention is illustrated in FIG. 10, the other embodiments of the decanter 1 illustrated in particular in FIGS. 12, 18, 19 and 20 constituting evolutions of the decanter 1 illustrated in FIG. 10 .
- the decanter 1 comprises an elongate casing 10 forming a shell or envelope defining an internal space, which is provided at one end with an inlet 11 for the oil-laden gases and at the opposite end of an outlet 12 for decanted gases.
- the casing 10 of the decanter 1 internally contains:
- an oil recovery chamber 5 in which a decanting oil return orifice 50 is provided towards the engine, said orifice 50 being situated at the bottom 14 of the decanter 1 and forming the inlet of a siphon 51, visible in Figure 11.
- the oil recovery chamber 5 is adjacent to the three intermediate suction chambers 41, 42, 43, each of these intermediate suction chambers 41, 42, 43 being in communication with said recovery chamber 5 by means of communication, respectively 71, 72, 73 (described in detail later).
- the recovery chamber 5 is in communication on the one hand with the admission chamber 2 of the gases via communication means 52 (described in detail later), and on the other hand with the outlet chamber 3 via a communication interface 53 (described in detail later) between the two said chambers 3 and 5.
- the oil recovery chamber 5 is divided into two successive compartments 54, 55, in communication with one another via communication means 56 (described in detail later): a first compartment 54, said intermediate compartment, in communication with the admission chamber 2 of the gases via the communication means 52, a second compartment 55, said main compartment, in which the settling oil return orifice 50 is provided, and which is in communication with the chamber output 3 of the gases via the communication interface 53.
- the first intermediate suction chamber 41 communicates with the intermediate compartment 54 via the communication means 71, while the second 42 and third 43 intermediate suction chambers respectively communicate with the main compartment 55 via the communication means 72 and 73 respectively.
- first intermediate suction chamber 41 is separated on the one hand from the inlet chamber 2 by the first oil collecting means 61, and on the other hand from the second intermediate suction chamber 42 next by the second oil collecting means 62. Then, said second intermediate suction chamber 42 is separated from the third intermediate suction chamber 43 by the third oil collection means 63. Finally, said third chamber intermediate suction 43 is separated from the outlet chamber 3 by the fourth oil collecting means 64.
- the first 61, second 62 and third successive capturing means are each formed of a row of obstacle separators; an embodiment of an obstacle separator being illustrated in detail in FIG. 14.
- An obstacle separator comprises at least one gas passage orifice 69 associated with deflection means 65 arranged opposite said passage orifice 69 in order to diverting all or part of the gas passing through said passage opening 69.
- the passage opening 69 may be delimited by two coplanar walls 66 spaced from one another, and the deflection means 65 consist of a deflection plate facing the passage opening 69, parallel to the walls 66, offset relative to these walls 66 by a distance d, and at least partially covering the passage opening 69 to deflect at least a portion of the flow of gas through said passage opening 69; the deflection plate 65 can thus leave a gap 67, on either side of said deflection plate 65, corresponding to a portion of the passage hole 69 not covered by the deflection plate 65.
- the deflection plate 65 It is possible to provide on the edge of the deflection plate 65 a suitable geometry, such as in the form of an inclined facet, to promote the deflection effect. It is thus noted that the flow of gas illustrated by the arrow F1 arriving in the gap 67 is deflected by the gas flow illustrated by the arrow F2 deflected directly by the deflection plate 65.
- the fourth capturing means 64 may take the form of an elevation, in particular of the walking type, associated with a difference in level or difference in level between the respective bottoms of these two chambers 3 and 43. This difference in level
- the height difference 64 may be in the form of an internal rib in the casing 10 of the decanter 1.
- the communication interface 53 takes the form of a difference in level, in particular of the walking type, associated with a difference. levels between the respective bottoms of these two chambers 3 and 55.
- This interface 53 in elevation also forms an obstacle in the secondary flow Fs thus allowing a final separation of the oil in the secondary flow Fs.
- this interface 53 is sized to have a balance of pressures between the main compartment 55 and the outlet chamber 3, regardless of the flow rate of the gas in the decanter 1.
- the pressure in the main compartment 55 is substantially independent oil in the liquid phase, in particular in the form of waves or jets or large drops.
- the difference in height 53 may be in the form of an internal rib in the casing 10 of the decanter 1.
- the interface 53 has a substantially rectangular shape with a length Ll corresponding to its dimension in the longitudinal direction of the housing 10, and with a height Hl corresponding to its dimension in the vertical direction.
- the length L1 is greater than or equal to 10 mm and the height H1 is greater than or equal to 10 mm.
- said flow rate is generally between 0 and 5 liters per minute, and can even reach values of the order of 200 liters per minute.
- FIG. 12 A second embodiment of the decanter 1 according to the invention is illustrated in FIG. 12, which differs from the first embodiment in that the capture means 64 are in the form of a convergence zone intended to concentrate the flow.
- a kind of ramp or inclined wall 64 oriented towards the upper part 13 of the decanter 1 in the flow direction of the main flow Fp.
- this inclined wall 64 accelerates the main flow Fp and makes it converge opposite the decanting oil return orifice 50 forming the inlet of the trap 51.
- the main flow Fp is not likely to disturb the oil storage and recovery zone upstream of the siphon 51, being directed in the upper part 13 of the decanter 1.
- This inclined wall 64 forms a connecting wall between the bottom (or floor) of the outlet chamber 3 and the bottom of the third intermediate suction chamber 43; said funds are of course not located at the same level to prevent the oil from passing the third intermediate suction chamber 43 to the outlet chamber 3.
- FIGS. 15a to 15c illustrate different embodiments of the communication means 52, 56, 71, 72 and 73.
- These communication means can comprise:
- FIG. 15a a hole of circular shape, as illustrated in FIG. 15a, and / or preferably a rectangular-shaped orifice, as illustrated in FIG. 15b, in order to maximize the pressure drop in turbulent flow, and / or
- the shape of the orifices is not limited to those described above, and the number and / or the dimensions of said orifices are to be determined as a function of the gas flows charged with liquid to be treated by the decanter 1.
- FIG. 16 illustrates the decanter 1 according to the second embodiment with a wave of oil H pointing towards the communication means 52 for putting the admission chamber into communication
- FIGS. 17a and 17b illustrate two embodiments of these communication means 52, which can of course be applied to the other means of communication 56, 71, 72 and 73.
- the communication means 52 comprise two orifices 521, 522 provided between the intake chamber and the intermediate compartment of the oil recovery chamber, said orifices 521, 522 being located at different levels. so that port 522 located in the lower part 1 4 of the decanter 1, as its floor, is mainly dedicated to the passage of the oil H and the orifice 521 located in the upper part 13 of the decanter 1 is dedicated mainly to the passage of the secondary flow Fs gas.
- several orifices may be provided at various heights or levels, said orifices may also have the various forms described above with reference to Figures 15a, 15b and 15c.
- the orifices 521, 522 are of rectangular shape and are formed in the corners of the partition wall 523 between the intake chamber 2 and the intermediate compartment 54.
- the two orifices 521, 522 correspond to free spaces between the partition wall 523 and the respectively high 13 and low 14 portions of the casing 10 of the decanter 1.
- These free spaces 521, 522 are designed by mounting sets of the partition wall 523, thus facilitating the design and manufacture of the decanter 1.
- the separation wall or walls 523 can be assembled, in particular by clipping, with play in the casing 10 of the decanter 1, so that the respectively upper and lower sets form the orifices respectively 521 and 522.
- the decanter 1 Since the decanter 1 is essentially intended to evacuate the oil in the liquid phase, it is conceivable to reduce the pressure losses induced by the first three successive capturing means 61, 62 and 63, by modifying the geometry of said capturing means 61, 62. , 63 so that they have a reduced main flow deflection effect Fp, while of course retaining their ability to recover oil in the liquid phase.
- the three embodiments illustrated in Figures 18, 19 and 20 are variants of the decanter 1 according to the second embodiment is illustrated in Figure 12, where the only modifications relate to the first three successive capturing means 61, 62 and 63.
- the capturing means 61, 62, 63 comprise at least one obstacle separator as described above with reference to FIG. 14 where, for each separator 61, 62, 63, the deflection plate 65 is smaller than the passage opening 69 delimited by two coplanar walls 66, so that the gap 67 is large, for example being of a surface comparable to the surface of the plate 65.
- Such separators 61, 62, 63 create little pressure drop while being effective in the separation of large drops or waves of oil.
- the interval 67 decreases between the first separator 61 and the second separator 62, and also between the second separator 62 and the third separator 63.
- the first separator 61 does not include no deflection plate, so that the interval is maximum because it is completely confused with the through hole 69.
- the second separator 62 comprises a deflection plate 65 opposite a through orifice 69 which the dimensions are such that they define a gap 67 of surface S1.
- the third separator 63 also comprises a deflection plate 65 facing a through hole 69 whose dimensions are such that they define a surface interval S2, where S2 is smaller than S1; the gap 67 being larger for the second separator 62 than for the third separator 63.
- passage orifices 69 of equal dimensions for the two separators 62, 63 correspond to deflection plates 65 centered on said orifices 69 where the deflection plate of the second separator 62 is smaller than the deflection plate of the third separator 63.
- the principle is the same as that mentioned above with a gap 67 which decreases between the separators 61 to 63.
- the difference is that the through openings 69 do not are not delimited by two coplanar walls 66, but by a single wall 66 and the housing 10 of the decanter 1, in particular to reduce the overall dimensions of the decanter 1 and simplify its design and production, including the demolding step or steps in case of manufacturing by molding a plastic material.
- the associated deflection plate 65 constitutes a plate protruding from the casing 10, parallel to the wall 66 and offset relative thereto so as to be located facing the corresponding through-hole 69; the deflection plate 65 of the second separator 62 being shorter than the deflection plate 65 of the third separator 63.
- the decanter 1 is essentially devoted to the separation of the oil entering the liquid phase, particularly in the form of waves or large drops.
- a cyclone separator 7 behind said decanter 1 for recover all or part of the remaining oil, in the aerosol phase, in the gases leaving said decanter 1.
- the cyclone separator 7 comprises a casing 700 delimiting an internal space containing: a cyclone 710 designed to separate the oil, in the form of particles in suspension, from the gases leaving the decanter 1, via its outlet 12, according to the principle of separation by centrifugal effect;
- a storage area 720 forming a storage volume for the oil H collected by the cyclone 710; an outlet pipe 730 for discharging the decanted gases out of the casing 700, said outlet pipe 730 being in communication with the inlet line for the return of the gases into the cylinder head.
- Cyclone 710 itself includes from top to bottom:
- a catchment area 750 formed of a cylindrical wall, where the drops of oil are projected onto said cylindrical wall; -
- An oil recovery zone 760 formed of a conical wall in the extension of the sensing zone 750 and ending in its lower part of smaller diameter by a lower central opening 770.
- Cyclone 710 also includes an upper central opening 780 through which a portion of the decanted gas stream axially emerges from the sensing 750 and storage 720 zones to flow into the outlet conduit 730.
- the lower central opening 770 opens into the storage area 720 to allow the gravity to escape from the oil of the cyclone 710 to the storage area 720.
- the outlet pipe 730 advantageously horizontal, acts as a water pipe. suction of the decanted gases, starting from the upper central opening 740 to the outside of the casing 700 of the cyclone separator 7.
- the gases admitted into the cyclone 710 by the tangential inlet 740 are divided into:
- the storage volume provided in the storage area 720 is sized to store oil throughout the operating life of the combustion engine, the oil thus stored is then discharged into the engine at a standstill of said engine. For example, such a design can be provided to allow storage for 4 hours of the oil arriving in the form of small aerosol phase drops for a worn engine operating at full power.
- the storage area 720 of the cyclone separator 7 can be sized to collect about 16 g of oil or more as a precaution.
- a valve can be provided in the bottom of the storage area 720 which opens only when the pressures are identical on each side of the valve, that is to say at the stop of the combustion engine internal, thus allowing the return of the stored oil towards the engine.
- cyclone separators can be envisaged, such as those described in the French patent application FR 2922126, both in the preamble of this patent application and in its specific description.
- a combination of a cyclone separator with a decanter can be considered with a decanter of the state of the art equipped with a Venturi, as those illustrated in Figures 3, 4, 8 and 9.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
- Separating Particles In Gases By Inertia (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011508976A JP2011521146A (ja) | 2008-05-14 | 2009-05-05 | 内燃機関のためのオイル分離器 |
CN200980116844.XA CN102027204B (zh) | 2008-05-14 | 2009-05-05 | 用于内燃发动机的油分离器 |
US12/992,643 US20110146639A1 (en) | 2008-05-14 | 2009-05-05 | Oil separator for internal combustion engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0802609A FR2931199B1 (fr) | 2008-05-14 | 2008-05-14 | Decanteur d'huile pour moteur a combustion interne |
FR08.02609 | 2008-05-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2009147336A2 true WO2009147336A2 (fr) | 2009-12-10 |
WO2009147336A3 WO2009147336A3 (fr) | 2010-03-11 |
Family
ID=40291218
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2009/050824 WO2009147336A2 (fr) | 2008-05-14 | 2009-05-05 | Decanteur d'huile pour moteur a combustion interne |
Country Status (6)
Country | Link |
---|---|
US (1) | US20110146639A1 (fr) |
JP (1) | JP2011521146A (fr) |
KR (1) | KR20110016883A (fr) |
CN (1) | CN102027204B (fr) |
FR (1) | FR2931199B1 (fr) |
WO (1) | WO2009147336A2 (fr) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2981859B1 (fr) | 2011-10-27 | 2013-11-15 | Coutier Moulage Gen Ind | Procede et dispositif pour la decantation d'huile contenue dans un flux gazeux |
EP2653678B1 (fr) * | 2012-04-19 | 2015-05-20 | Fiat Powertrain Technologies S.p.A. | Dispositif de separation d'huile dans un systéme de recirculation de gas de carter pour un moteur à combustion interne |
US9528407B2 (en) * | 2013-12-12 | 2016-12-27 | Toyota Motor Engineering & Manufacturing North America, Inc. | High efficiency cyclone oil separator device |
CN105089741B (zh) * | 2014-04-18 | 2018-10-16 | 比亚迪股份有限公司 | 发动机及其气缸盖罩组件 |
KR20160057114A (ko) * | 2014-11-13 | 2016-05-23 | 현대자동차주식회사 | 오일 세퍼레이터 |
JP2016113999A (ja) * | 2014-12-17 | 2016-06-23 | アイシン精機株式会社 | オイルミスト分離装置 |
US10661210B2 (en) | 2015-09-15 | 2020-05-26 | Miniature Precision Components, Inc. | Oil separator including spiral members defining helical flow paths |
US10286347B2 (en) | 2015-09-15 | 2019-05-14 | Miniature Precision Components, Inc. | Oil separator including spiral members defining helical flow paths |
CN107489483B (zh) * | 2016-07-18 | 2020-09-15 | 北汽福田汽车股份有限公司 | 一种油气分离器及发动机总成 |
US20180369828A1 (en) * | 2017-06-22 | 2018-12-27 | Marc Vanderbeken | Method and Apparatus for separating organics from a contaminated organics-inorganics waste stream |
US10975814B1 (en) * | 2018-04-09 | 2021-04-13 | Aeromotive, Inc. | Apparatus and method for modifying a fuel tank to accept an in-tank fuel pump |
FR3103856B1 (fr) * | 2019-12-02 | 2022-12-02 | Renault Sas | Décanteur d’huile comprenant une chambre d’air frais. |
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US5944001A (en) * | 1995-12-22 | 1999-08-31 | Rover Group Limited | Liquid from gas separator and an internal combustion engine including same |
FR2789125A1 (fr) * | 1999-01-29 | 2000-08-04 | Renault | Dispositif de reaspiration des gaz de carter d'un moteur |
FR2874646A1 (fr) * | 2004-08-27 | 2006-03-03 | Coutier Moulage Gen Ind | Deshuileur pour moteur a combustion interne |
US20060075998A1 (en) * | 2004-10-08 | 2006-04-13 | Teng-Hua Shieh | Oil separator |
FR2881468A1 (fr) * | 2005-02-03 | 2006-08-04 | Coutier Moulage Gen Ind | Dispositif de decantation d'huile pour moteur a combustion interne |
FR2898386A1 (fr) * | 2006-03-07 | 2007-09-14 | Coutier Moulage Gen Ind | Decanteur d'huile pour moteur a combustion interne |
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US5499001A (en) * | 1994-02-24 | 1996-03-12 | Degun; Joginder S. | Cavity matched hybrid coupler |
JP3313553B2 (ja) * | 1995-09-29 | 2002-08-12 | 株式会社 マーレ テネックス | オイルミストセパレータ |
JP4213968B2 (ja) * | 2003-02-14 | 2009-01-28 | 愛知機械工業株式会社 | 内燃機関のブローバイガス還流装置 |
US7080636B2 (en) * | 2003-05-05 | 2006-07-25 | Dichtungstechnik G. Bruss Gmbh & Co. Kg | Oil separating device for a combustion engine |
JP4273839B2 (ja) * | 2003-06-02 | 2009-06-03 | マツダ株式会社 | 車両用エンジン |
JP4075714B2 (ja) * | 2003-07-11 | 2008-04-16 | トヨタ自動車株式会社 | 内燃機関のブリーザ室構造 |
JP4346072B2 (ja) * | 2004-01-19 | 2009-10-14 | 日産ディーゼル工業株式会社 | ロッカーカバー装置 |
JP4432899B2 (ja) * | 2005-12-28 | 2010-03-17 | トヨタ自動車株式会社 | V型エンジンのpcvシステム |
JP4169763B2 (ja) * | 2006-03-20 | 2008-10-22 | 小島プレス工業株式会社 | ブローバイガス用オイルセパレータ |
DE102007008672A1 (de) * | 2007-02-20 | 2008-09-04 | Dichtungstechnik G. Bruss Gmbh & Co. Kg | Zylinderkopfhaube für einen Verbrennungsmotor |
US7562652B2 (en) * | 2007-03-12 | 2009-07-21 | Gm Global Technology Operations, Inc. | Engine PCV system with hydrophobic, oleophobic membrane for air/oil separation |
-
2008
- 2008-05-14 FR FR0802609A patent/FR2931199B1/fr active Active
-
2009
- 2009-05-05 US US12/992,643 patent/US20110146639A1/en not_active Abandoned
- 2009-05-05 JP JP2011508976A patent/JP2011521146A/ja active Pending
- 2009-05-05 KR KR1020107025327A patent/KR20110016883A/ko not_active Application Discontinuation
- 2009-05-05 WO PCT/FR2009/050824 patent/WO2009147336A2/fr active Application Filing
- 2009-05-05 CN CN200980116844.XA patent/CN102027204B/zh active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US5944001A (en) * | 1995-12-22 | 1999-08-31 | Rover Group Limited | Liquid from gas separator and an internal combustion engine including same |
FR2789125A1 (fr) * | 1999-01-29 | 2000-08-04 | Renault | Dispositif de reaspiration des gaz de carter d'un moteur |
FR2874646A1 (fr) * | 2004-08-27 | 2006-03-03 | Coutier Moulage Gen Ind | Deshuileur pour moteur a combustion interne |
US20060075998A1 (en) * | 2004-10-08 | 2006-04-13 | Teng-Hua Shieh | Oil separator |
FR2881468A1 (fr) * | 2005-02-03 | 2006-08-04 | Coutier Moulage Gen Ind | Dispositif de decantation d'huile pour moteur a combustion interne |
FR2898386A1 (fr) * | 2006-03-07 | 2007-09-14 | Coutier Moulage Gen Ind | Decanteur d'huile pour moteur a combustion interne |
Also Published As
Publication number | Publication date |
---|---|
FR2931199B1 (fr) | 2010-04-23 |
CN102027204A (zh) | 2011-04-20 |
KR20110016883A (ko) | 2011-02-18 |
WO2009147336A3 (fr) | 2010-03-11 |
US20110146639A1 (en) | 2011-06-23 |
JP2011521146A (ja) | 2011-07-21 |
FR2931199A1 (fr) | 2009-11-20 |
CN102027204B (zh) | 2015-07-22 |
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