WO2015178310A1 - オイルセパレータ - Google Patents

オイルセパレータ Download PDF

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Publication number
WO2015178310A1
WO2015178310A1 PCT/JP2015/064035 JP2015064035W WO2015178310A1 WO 2015178310 A1 WO2015178310 A1 WO 2015178310A1 JP 2015064035 W JP2015064035 W JP 2015064035W WO 2015178310 A1 WO2015178310 A1 WO 2015178310A1
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WO
WIPO (PCT)
Prior art keywords
oil
gas
flow
discharge
backflow
Prior art date
Application number
PCT/JP2015/064035
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
吉良直樹
Original Assignee
アイシン精機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by アイシン精機株式会社 filed Critical アイシン精機株式会社
Publication of WO2015178310A1 publication Critical patent/WO2015178310A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/24—Multiple arrangement thereof
    • B04C5/28—Multiple arrangement thereof for parallel flow
    • 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
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil

Definitions

  • the present invention relates to an oil separator, and more particularly to a technique for suppressing the phenomenon that oil separated by the oil separator flows upward with blow-by gas.
  • Patent Document 1 As an oil separator configured as described above, in Patent Document 1, a valve seat is disposed below the inlet on the lower side of the separation chamber constituting the oil separator, and a first valve body on the inlet side, The valve mechanism which connected the 2nd valve body by the side of a valve seat with a valve stem is shown.
  • the valve mechanism when a pressure difference occurs between the pressure in the crank chamber and the intake manifold pressure, the valve mechanism abuts on the inlet side or the outlet side of the valve seat by the up and down operation, and either the inlet or the valve seat The oil will stay in the heels.
  • the valve mechanism is held at the position where the valve seat is opened, and the oil retained inside can be made to flow down to the crank chamber.
  • Patent Document 2 discloses a configuration in which a baffle plate is provided at a portion directed from an oil discharge port to an exhaust pipe inside a case member constituting an oil separator.
  • the baffle plate blocks the gas flowing upward from the oil discharge port, and the baffle plate allows the gas to flow to the inner circumferential surface of the oil separator. It is configured to centrifuge oil from the gas flowing along the upper swirling flow.
  • the blowby gas generated in the crankcase of the internal combustion engine contains an oil mist of unburned gas and engine oil. For this reason, it is not released into the atmosphere as it is, but is supplied to the combustion chamber of the internal combustion engine and burned with the mixture.
  • blowby gas containing the oil mist is burned together with the air-fuel mixture in the combustion chamber of the internal combustion engine, the emission is deteriorated and the reduction of the engine oil is promoted. Therefore, oil contained in blowby gas is collected by an oil separator and returned to the internal combustion engine.
  • the oil separator is disposed in the path of the blowby gas back to the intake system of the internal combustion engine. For this reason, negative pressure from the intake system acts on the internal blowby gas flow passage at the intake timing of the internal combustion engine.
  • the oil separator configured to collect oil from oil mist contained in the blowby gas sent to the blowby gas distribution unit and discharge it from the oil discharge port formed at the bottom by its own weight, the oil acts by negative pressure. In some cases, the oil inside the oil separator flows back from the discharge port, and the oil again becomes mist.
  • Patent Document 1 and Patent Document 2 function effectively in order to suppress the phenomenon that the oil collected in this way flows back.
  • the valve mechanism since the valve mechanism has a member that operates, in the case of a malfunction, the flow of gas from the crankcase side upward can not be suppressed, and in terms of stability. There is room for improvement.
  • the structure of patent document 2 it is the structure which has arrange
  • An object of the present invention is to rationally constitute an oil separator capable of suppressing the phenomenon in which oil separated in an oil separation portion mixes in blow-by gas.
  • the feature of the present invention is the downward flow of the oil at a portion of the oil separation portion for separating oil mist contained in the blowby gas and the portion below the discharge opening which is the smallest diameter at the lower portion of the oil separation portion.
  • a reverse flow suppression unit that suppresses the flow of air in the direction opposite to the oil discharge direction while allowing the backflow suppression unit to move from the upper end facing the discharge opening to the lower end of the reverse flow suppression unit.
  • it is a point formed by the non-linear communication passage formed in a fixed state with respect to the constituent member of the backflow suppressing portion.
  • this configuration the negative pressure acting on the oil separation portion is increased, and the backflow suppression portion suppresses the flow of the gas to the discharge opening side even in the situation where the gas flows from the backflow suppression portion to the oil separation portion. For this reason, the flow velocity and the flow rate of the gas drawn into the oil separation unit from the discharge opening do not increase.
  • this backflow suppressing portion is formed by a non-linear flow path formed in a fixed state in a region extending from the upper end to the lower end of the component member, for example, an oil separator provided with a valve body of which the conventional position is displaced
  • the configuration is simplified compared to etc. Therefore, the oil separator which can control the phenomenon in which the oil separated by the oil separation part mixes in blowby gas was constituted.
  • the communication passage of the backflow suppressing portion is formed in a spiral shape, and the direction of the spiral of the communication passage is the same as the swirling direction of the blowby gas in the oil separation portion. It may be set to an attitude in which the gas flows upward.
  • the flow path length of the communication path can be increased without enlarging the dimension in the vertical direction of the backflow suppressing portion.
  • the resistance acting on the gas flowing in the communication passage is increased.
  • the increase in the flow velocity and flow rate of the gas flowing in the communication passage is limited.
  • the amount of rise of gas and the rate of rise are limited to suppress oil re-mist formation.
  • the cyclone-type oil separation unit swirls the blowby gas to separate the oil mist by centrifugal force.
  • the communication passage is configured to send gas downward when the gas flows in the same direction as the swirling direction of the blowby gas in the oil separation unit, the blowby gas flows into the communication passage and the communication passage It was also imagined to re-mist in contact with the oil flowing down.
  • the direction of the spiral of the communication passage as in the present invention, it is possible to suppress the phenomenon that the swirling flow of the gas from the oil separation portion flows into the communication passage, and improve the oil discharge performance. It becomes possible.
  • the backflow suppressing portion may be provided with a non-woven fabric capable of suppressing the flow of gas opposite to the permeation of oil while allowing permeation of the oil flowing down from the discharge opening.
  • the oil mist separated from the blowby gas in the oil separation portion flows downward through the flow-down path, and permeates the non-woven fabric when flowing in this manner.
  • the nonwoven fabric exerts resistance against the gas, so Limit the increase in flow velocity and flow rate of the flowing gas to suppress oil re-mist formation.
  • the backflow suppressing portion and the oil separating portion can be integrally formed.
  • the backflow suppressing portion and the oil separating portion as described above, the number of parts of the oil separator can be reduced. Therefore, manufacturing costs and assembly costs can be reduced.
  • the backflow suppressing portion and the oil separating portion can be separately configured.
  • the shapes of the backflow control unit and the oil separation unit can be easily configured in various ways. For example, it becomes easy to make the backflow suppression part of the complicated structure where the separation effect of oil is high. In addition, it is possible to obtain an oil separator excellent in convenience, such as easy installation of other members such as various filters between the backflow suppressing portion and the oil separating portion.
  • a buffer space having a flow passage cross-sectional area larger than the flow passage cross-sectional area of the discharge opening may be provided between the oil separation portion and the backflow suppressing portion.
  • the gas in the buffer space flows from the discharge opening toward the oil separation portion, and the lower side of the buffer space Reduce the negative pressure acting on the oil separation unit from the connected flow path.
  • the backflow of gas can be suppressed and re-mist formation of oil can be suppressed more favorably.
  • FIG. 2 is a cross-sectional view taken along line II-II of FIG.
  • FIG. 3 is a cross-sectional view taken along line III-III of FIG. It is a sectional view showing an oil separation part and a backflow control part. It is sectional drawing which shows the oil separation part and backflow suppression part of another embodiment (a). It is sectional drawing which shows the oil separation part and backflow suppression part of another embodiment (b). It is sectional drawing which shows the oil separation part and backflow suppression part of another embodiment (c).
  • FIGS. 1 to 4 a gas supply case A, a plurality of cyclone type oil separation units B, a backflow suppression unit C connected to the lower part of the oil separation units B, a gas discharge case D, oil
  • An oil separator is configured to include the discharge case E.
  • the oil separator is interposed in a path for returning the blowby gas generated in the crank chamber of an engine as an internal combustion engine to the intake system of the engine, and functions to remove oil mist contained in the blowby gas.
  • a gas suction port 1 to which blow-by gas is supplied is formed, and an oil separation portion B is integrally formed inside the gas supply case A.
  • the oil separation unit B has a function of separating and collecting the oil mist contained in the blowby gas, forming droplets into droplets, and delivering the droplets downward.
  • the oil separator is provided with a plurality of oil separation parts B, and the cylindrical case parts 5 at the upper part of each oil separation part B are arranged in parallel so as to be exposed to the internal space of the gas supply case A.
  • the backflow suppression unit C is connected to the lower end of the oil separation unit B, discharges the oil droplets formed in the oil separation unit B into the internal space of the oil discharge case E, and the negative pressure acting on the gas supply case A is rapid. Even when the pressure rises, by reducing the flow velocity of the gas flowing upward through the inside, the phenomenon of the gas spouting into the inside of the oil separation portion B is suppressed, and the oil re-mist formation is prevented.
  • a gas discharge port 2 for discharging blow-by gas is formed in the gas discharge case D, and the gas discharge port 2 communicates with an intake path of the engine.
  • the oil discharge case E has an oil discharge port 3 for receiving the oil discharged from the backflow suppression unit C and discharging it to the outside. The oil discharged from the oil discharge port 3 is returned to a position such as the inside of the cylinder head of the engine or the inside of the crankcase.
  • a gas supply case A a gas supply case A, a plurality of oil separation portions B, a backflow suppression portion C, a gas discharge case D, and an oil discharge case E are formed of resin. Further, the gas discharge case D is disposed at a position covering the upper portion of the gas supply case A, and the oil discharge case E is disposed below the backflow suppressing portion C.
  • the oil separation portion B integrally forms a cone portion 6 having a smaller diameter toward the lower side centering on the pivot axis center at the lower position of the cylindrical case portion 5.
  • the discharge opening 7 is formed at a position where the diameter is the smallest at the lower end inside.
  • the cylindrical case portion 5 is formed with a supply port 5 A for taking the blowby gas supplied to the gas supply case A in the tangential direction of the cylindrical case portion 5. Further, on the bottom wall 10 of the gas discharge case D, a discharge cylinder 11 disposed coaxially with the axial center of the cylindrical case portion 5 is integrally formed in a downward projecting manner.
  • the backflow suppressing portion C has a spiral shape (in the inside of the discharge member 15 (an example of a component) connected to the lower end of the cone portion 6 of the oil separation portion B to guide oil from the discharge opening 7 of the cone portion 6 downward
  • the discharge flow path 16 (an example of a communication path) which becomes a spiral through hole is provided in a fixed state. That is, in the discharge member 15 as a constituent member of the reverse flow suppressing portion C, the discharge flow passage 16 is spirally formed as a non-linear communication passage in a region from the upper end facing the discharge opening 7 to the lower end of the discharge member 15 Is formed.
  • a spiral core is set inside a mold for manufacturing the discharge member 15, and after molding by resin, the core is rotated. It will be extracted.
  • the discharge flow path 16 is not limited to one formed in a spiral hole shape, and a spiral groove which is a deep groove may be formed in the discharge member 15.
  • a screw-like core (having a shape such as a screw conveyor) is set inside a mold for producing the discharge member 15, and the core is formed after molding with a resin. Will be extracted while rotating.
  • the discharge flow path 16 is set to have a gas flowing upward when the gas flows in the same direction as the swirling direction of the blowby gas in the oil separation unit B. That is, the direction of the spiral is set so that the blow-by gas can not flow into the inside of the discharge flow path 16 even when the blow-by gas reaches the portion of the discharge opening 7 in a swirling state inside the cone portion 6.
  • discharge flow path 16 may be formed in the backflow suppression portion C, a plurality of the discharge flow paths 16 may be formed in the lower end of the oil separation portion B.
  • the discharge member 15 of the backflow suppressing portion C can be integrally formed at the lower end of the cone portion 6 of the oil separating portion B.
  • integrally forming the backflow suppressing portion C and the oil separating portion B in this manner the number of parts of the oil separator can be reduced. In that case, the manufacturing cost and the assembly cost can be reduced.
  • the backflow suppressing portion C and the oil separating portion B can be separately configured. If the backflow suppressing portion C is separate from the oil separating portion B, it becomes easy to configure the shapes of the both in various ways. For example, it becomes easy to make the backflow suppression part C of the complicated structure where the separation effect of oil is high. In addition, it becomes easy to install different members such as various filters between the backflow suppressing portion C and the oil separating portion B, and an oil separator having excellent convenience can be obtained. When the backflow suppressing portion C and the oil separating portion B are separately configured, these members can be configured to be fixed to each other by means such as welding or screwing.
  • the negative pressure of the intake system acts on the gas discharge port 2 of the gas discharge case D, and this negative pressure is an internal space of the gas supply case A via the discharge cylinder 11. Act on. By the action of this negative pressure, the blowby gas is sucked from the gas suction port 1 of the gas supply case A into the internal space, and is further supplied to any of the supply ports 5A of the plurality of cylindrical case parts 5.
  • the supply port 5A is formed so as to take in the blowby gas in the tangential direction of the cylindrical case 5, the supplied blowby gas flows along the inner peripheral surface of the cylindrical case 5 and swirls. In the state, it moves downward along the inner circumference of the cone portion 6.
  • the oil mist contained in the blowby gas adheres to the inner peripheral surface of the cone portion 6 by the centrifugal force and is collected in the form of droplets. Further, the blowby gas in which the oil mist is separated and collected rises inside the discharge cylinder 11 to flow into the inside of the gas discharge case D, and is further sucked from the gas discharge port 2 into the intake system of the engine. The blowby gas is supplied to the combustion chamber of the engine and burns with the mixture.
  • oil droplets formed on the inner surface of the cone portion 6 flow downward by their own weight, flow from the discharge opening 7 to the discharge flow path 16, and are discharged from the lower end of the discharge flow path 16 to the oil discharge case E. In fact, it will be returned to the engine.
  • the discharge flow path 16 is formed in a spiral shape (spiral shape), the flow path of the discharge flow path 16 without enlarging the dimension of the backflow suppressing portion C in the vertical direction.
  • the length is increased to increase the flow path resistance of the discharge flow path 16.
  • the setting of the direction of the spiral of the discharge flow path 16 suppresses the inconvenience that the swirling flow of the gas inside the cone portion 6 intrudes into the discharge flow path 16.
  • the backflow suppressing portion C swirls this gas, so Eliminates the problem of being blown up linearly upward, and suppresses oil re-mist formation better.
  • the backflow suppressing portion C is provided with the flow-down case 21 for guiding the oil from the discharge opening 7 of the cone portion 6 downward, and the non-woven fabric 22 provided inside the flow-down case 21.
  • the non-woven fabric 22 has a function as a filter member, allows downward permeation of oil, and functions to provide a large resistance to gas permeation.
  • the flow-down case 21 is vertically divided into the upper case 21a and the lower case 21b, and the non-woven fabric 22 is provided in a state of being sandwiched therebetween, and the non-woven fabric 22 can be replaced. It is configured.
  • the oil mist separated from the blowby gas at the oil separation portion B flows into the flow-down case 21 and permeates the non-woven fabric 22 and is discharged to the outside from the opening at the lower end of the flow-down case 21 .
  • the non-woven fabric 22 is a non-linear communication path formed between a number of fibers forming the non-woven fabric 22.
  • resistance acts on the gas flowing in the communication path between the fibers of the non-woven fabric 22. The flow velocity and the flow rate of the gas rising from the opening 7 are reduced to suppress the re-mist formation of the oil.
  • the nonwoven fabric 22 may be insert-molded to the backflow suppressing portion C or the oil separating portion B. With such a configuration, the attachment state of the non-woven fabric 22 becomes stable, and it is possible to reduce costs, for example, the time and effort required for managing parts can be reduced.
  • porous metal bodies (Celmet), metal mesh members and the like can be used as filter members.
  • any material that allows the downward permeation of oil separated from the oil mist and provides resistance to the permeation of gas can be used as a filter member.
  • the discharge flow path 16 is formed by a single through hole which becomes spiral with respect to the discharge member 15 connected to the lower end of the cone portion 6 .
  • the flow path length of the discharge flow path 16 is made longer to further increase the flow path resistance of the discharge flow path 16 as compared with the case where the discharge flow path 16 is formed by a pair of spirally formed through holes. Even when the negative pressure acting on the oil separation portion B rapidly rises, the flow velocity and the flow rate of the gas rising from the discharge opening 7 are further reduced to realize suppression of oil re-mist formation.
  • discharge flow path 16 of the configuration of this another embodiment (c) may be combined with the non-woven fabric 22 of the other embodiment (a), or may be combined with the buffer space 25S of another embodiment (b).
  • this discharge flow path 16 does not necessarily need to be formed in helical form, for example, may be formed in zigzag form.
  • the backflow suppressing portion C may be configured by combining the discharge flow path 16 and the non-woven fabric 22.
  • the present invention can be used for an oil separator provided with a cyclone-type oil separation unit.
  • Discharge opening 15 Components (discharge member) 16 Communication passage (discharge passage) 22 Non-woven fabric 25S Buffer space B Oil separation part C Backflow suppression part

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Cyclones (AREA)
  • Separating Particles In Gases By Inertia (AREA)
PCT/JP2015/064035 2014-05-20 2015-05-15 オイルセパレータ WO2015178310A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-104368 2014-05-20
JP2014104368A JP6248804B2 (ja) 2014-05-20 2014-05-20 オイルセパレータ

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WO2015178310A1 true WO2015178310A1 (ja) 2015-11-26

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JP (1) JP6248804B2 (enrdf_load_stackoverflow)
WO (1) WO2015178310A1 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017099040A1 (ja) * 2015-12-09 2017-06-15 株式会社神戸製鋼所 中子造型方法および中子造型装置
CN113521888A (zh) * 2020-04-17 2021-10-22 广东美的白色家电技术创新中心有限公司 油分离器及压缩机组件
GB2625094A (en) * 2022-12-05 2024-06-12 Jcb Res Internal combustion engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2020375940A1 (en) * 2019-10-31 2022-05-12 Mott Corporation Two-phase separator devices incorporating inertial separation and porous media extraction

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1018831A (ja) * 1996-07-04 1998-01-20 Kojima Press Co Ltd 内燃機関用オイルトラッパ
US20050279700A1 (en) * 2004-05-13 2005-12-22 Jurgen Wagner Device for separating liquid components from a gas flow with a cyclone, a tank and a cyclone tank turbulence brake
JP2007503545A (ja) * 2003-08-25 2007-02-22 エフ・エー・フアウ・モトーレンテヒニック・ゲゼルシヤフト・ミト・ベシユレンクテル・ハフツング 内燃機関におけるクランク室の通気装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4622868B2 (ja) * 2006-01-16 2011-02-02 トヨタ紡織株式会社 気泡分離器
JP4535021B2 (ja) * 2006-03-29 2010-09-01 トヨタ紡織株式会社 気液分離器
JP4626586B2 (ja) * 2006-08-03 2011-02-09 トヨタ紡織株式会社 気液分離器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1018831A (ja) * 1996-07-04 1998-01-20 Kojima Press Co Ltd 内燃機関用オイルトラッパ
JP2007503545A (ja) * 2003-08-25 2007-02-22 エフ・エー・フアウ・モトーレンテヒニック・ゲゼルシヤフト・ミト・ベシユレンクテル・ハフツング 内燃機関におけるクランク室の通気装置
US20050279700A1 (en) * 2004-05-13 2005-12-22 Jurgen Wagner Device for separating liquid components from a gas flow with a cyclone, a tank and a cyclone tank turbulence brake

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017099040A1 (ja) * 2015-12-09 2017-06-15 株式会社神戸製鋼所 中子造型方法および中子造型装置
CN113521888A (zh) * 2020-04-17 2021-10-22 广东美的白色家电技术创新中心有限公司 油分离器及压缩机组件
GB2625094A (en) * 2022-12-05 2024-06-12 Jcb Res Internal combustion engine

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