JP4129688B2 - Fluid injection valve - Google Patents

Fluid injection valve Download PDF

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Publication number
JP4129688B2
JP4129688B2 JP2004146071A JP2004146071A JP4129688B2 JP 4129688 B2 JP4129688 B2 JP 4129688B2 JP 2004146071 A JP2004146071 A JP 2004146071A JP 2004146071 A JP2004146071 A JP 2004146071A JP 4129688 B2 JP4129688 B2 JP 4129688B2
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Prior art keywords
nozzle hole
fluid
nozzle
valve seat
valve
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JP2005325800A (en
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亮一 多田
原田　　明典
清考 吉丸
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Denso Corp
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Denso Corp
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Priority to JP2004146071A priority Critical patent/JP4129688B2/en
Priority to CNB2005100702471A priority patent/CN100396909C/en
Priority to DE200510022562 priority patent/DE102005022562A1/en
Publication of JP2005325800A publication Critical patent/JP2005325800A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0675—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the valve body having cylindrical guiding or metering portions, e.g. with fuel passages
    • F02M51/0678—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the valve body having cylindrical guiding or metering portions, e.g. with fuel passages all portions having fuel passages, e.g. flats, grooves, diameter reductions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1826—Discharge orifices having different sizes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/184—Discharge orifices having non circular sections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1846—Dimensional characteristics of discharge orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Nozzles (AREA)

Description

本発明は、流体の噴射を断続する流体噴射弁に関する。   The present invention relates to a fluid injection valve that intermittently injects fluid.

従来、流体噴射弁としては、軸方向に移動する弁部材によって流体通路を開閉し、噴孔からの流体の噴射を断続する燃料噴射弁が知られている（例えば、特許文献１参照）。特許文献１に開示されている燃料噴射弁では、弁ボディの軸方向に重ねられた二つの噴孔を有している。   Conventionally, as a fluid injection valve, a fuel injection valve that opens and closes a fluid passage by a valve member that moves in an axial direction and intermittently injects fluid from an injection hole is known (see, for example, Patent Document 1). The fuel injection valve disclosed in Patent Document 1 has two injection holes stacked in the axial direction of the valve body.

特開平９−１２６０９５号公報Japanese Patent Application Laid-Open No. 9-126095

特許文献１に開示されている燃料噴射弁の場合、弁座に近いほど流体である燃料の圧力は高い。そのため、弁座に近い噴孔から噴射された燃料は十分に微粒化が達成されるものの、弁座から遠い噴孔から噴射された燃料は微粒化が劣る。その結果、二つの噴孔から噴射された燃料が形成する噴霧は、全体として微粒化が劣るという問題がある。
そこで、本発明の目的は、複数の噴孔から噴射される噴霧全体が微粒化される流体噴射弁を提供することにある。 In the case of the fuel injection valve disclosed in Patent Literature 1, the closer to the valve seat, the higher the pressure of the fuel that is fluid. Therefore, although the fuel injected from the nozzle hole near the valve seat is sufficiently atomized, the fuel injected from the nozzle hole far from the valve seat is inferior in atomization. As a result, the spray formed by the fuel injected from the two injection holes has a problem that the atomization is inferior as a whole.
Therefore, an object of the present invention is to provide a fluid injection valve in which the entire spray injected from a plurality of injection holes is atomized.

請求項１記載の発明では、弁ボディの軸方向に重ねられている二つ以上の噴孔は弁座に近いほど開口面積が大きい。そのため、流体通路を通過した流体は開口面積の大きな弁座に近い噴孔を経由して噴射される。流体の圧力は弁座に近いほど高いため、弁座に近い噴孔からは圧力の高い流体が噴射される。したがって、弁座に近い噴孔からは圧力の高い流体が噴射され、微粒化を促進することができる。また、弁座から遠い噴孔の開口面積を小さくすることにより、弁座から遠い噴孔を流れる流体は絞り効果により圧力が上昇する。したがって、弁座から遠い噴孔から噴射される流体も微粒化が促進され、噴霧全体の微粒化を促進することができる。   In the first aspect of the present invention, the opening area of the two or more injection holes that are overlapped in the axial direction of the valve body is larger as it is closer to the valve seat. Therefore, the fluid that has passed through the fluid passage is ejected through an injection hole close to a valve seat having a large opening area. Since the pressure of the fluid is higher as it is closer to the valve seat, the fluid with higher pressure is ejected from the nozzle hole near the valve seat. Therefore, a fluid with high pressure is ejected from the nozzle hole close to the valve seat, and atomization can be promoted. Further, by reducing the opening area of the nozzle hole far from the valve seat, the pressure of the fluid flowing through the nozzle hole far from the valve seat increases due to the throttling effect. Therefore, atomization of the fluid ejected from the nozzle hole far from the valve seat is promoted, and atomization of the entire spray can be promoted.

また、請求項１記載の発明では、弁座に近い噴孔は弁座から遠い噴孔よりも弁ボディの周方向の長さが大きい。これにより、弁座に噴孔から噴射される流体は薄い液膜状となる。したがって、液膜の分離が促進され、流体の微粒化をさらに促進することができる。 According to the first aspect of the present invention, the nozzle hole near the valve seat is longer in the circumferential direction of the valve body than the nozzle hole far from the valve seat. Thereby, the fluid sprayed from the nozzle hole to the valve seat becomes a thin liquid film. Therefore, the separation of the liquid film is promoted, and the atomization of the fluid can be further promoted.

流体通路を通過する流体は、流体通路を形成する弁ボディの内壁面と弁部材の外壁面とがなす角度を二等分する仮想二等分線に沿った部分において流量および圧力が大きくなる。すなわち、仮想二等分線に沿った流体の流れは、流体通路を流れる流体の主流となる。流体の主流が噴孔へ直接流入すると、噴孔から噴射される流体は弁部材の偏心にともなう主流の変動の影響を受けやすくなる。その結果、噴孔から噴射される流体の噴射量および噴霧の形状が不安定になる。そこで、請求項１記載の発明では、仮想二等分線と噴孔の軸とはずれている。これにより、流体通路を通過する流体の主流が各噴孔に直接流入することを防止できる。したがって、噴孔から噴射される流体は主流の変動の影響を受けず、噴射量および噴霧の形状を安定化させることができる。 The fluid passing through the fluid passage has a large flow rate and pressure at a portion along a virtual bisector that bisects the angle formed by the inner wall surface of the valve body and the outer wall surface of the valve member forming the fluid passage. That is, the flow of the fluid along the virtual bisector becomes the main flow of the fluid flowing through the fluid passage. When the main flow of the fluid flows directly into the nozzle hole, the fluid ejected from the nozzle hole is easily affected by fluctuations in the main flow due to the eccentricity of the valve member. As a result, the amount of fluid ejected from the nozzle hole and the spray shape become unstable. Therefore, in the first aspect of the invention, the virtual bisector and the axis of the nozzle hole are deviated. Thereby, the main flow of the fluid passing through the fluid passage can be prevented from flowing directly into each nozzle hole. Therefore, the fluid ejected from the nozzle hole is not affected by fluctuations in the main flow, and can stabilize the ejection amount and the spray shape.

以下、本発明の複数の実施形態を図面に基づいて説明する。
（第１実施形態）
本発明の第１実施形態による流体噴射弁（以下、流体噴射弁を「インジェクタ」という。）を図２に示す。第１実施形態によるインジェクタ１０は、例えばエンジンの排気通路に設置され排気を浄化する排気浄化装置に適用される。すなわち、インジェクタ１０は還元触媒へ流体である還元剤としての燃料を噴射する燃料噴射弁である。なお、インジェクタ１０は、排気浄化装置に限らず、エンジンの燃焼室へ燃料を噴射する直噴式のガソリンエンジンもしくはディーゼルエンジン、または吸気通路を流れる吸気へ燃料を噴射する予混合式のガソリンエンジンもしくはディーゼルエンジンなどに燃料を噴射する燃料噴射弁に適用してもよい。本実施形態の場合、インジェクタ１０は、排気浄化装置を構成する図示しない排気通路に設置される。また、インジェクタ１０が噴射する流体は還元剤である。本実施形態では、インジェクタ１０は、流体である還元剤の一例として燃料を噴射する例について説明する。なお、還元剤である流体としては、例えばガソリンや軽油などの燃料を適用することができる。 Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 2 shows a fluid injection valve according to the first embodiment of the present invention (hereinafter, the fluid injection valve is referred to as an “injector”). The injector 10 according to the first embodiment is applied to, for example, an exhaust purification device that is installed in an exhaust passage of an engine and purifies exhaust gas. That is, the injector 10 is a fuel injection valve that injects fuel as a reducing agent that is a fluid into the reduction catalyst. The injector 10 is not limited to the exhaust purification device, but is a direct injection gasoline engine or diesel engine that injects fuel into the combustion chamber of the engine, or a premixed gasoline engine or diesel that injects fuel into the intake air flowing through the intake passage. The present invention may be applied to a fuel injection valve that injects fuel into an engine or the like. In the case of this embodiment, the injector 10 is installed in an exhaust passage (not shown) that constitutes the exhaust purification device. Moreover, the fluid which the injector 10 injects is a reducing agent. In the present embodiment, an example in which the injector 10 injects fuel as an example of a reducing agent that is a fluid will be described. In addition, as fluid which is a reducing agent, fuels, such as gasoline and light oil, can be applied, for example.

インジェクタ１０のハウジング１１は筒状に形成されている。ハウジング１１は、第一磁性部１２、非磁性部１３および第二磁性部１４を有している。非磁性部１３は、第一磁性部１２と第二磁性部１４との磁気的な短絡を防止する。第一磁性部１２、非磁性部１３および第二磁性部１４は、例えばレーザ溶接などにより一体に接続されている。なお、ハウジング１１を磁性材料により筒状の一体物に成形し、熱加工することにより非磁性部１３に対応する部分を非磁性化してもよい。   The housing 11 of the injector 10 is formed in a cylindrical shape. The housing 11 has a first magnetic part 12, a nonmagnetic part 13, and a second magnetic part 14. The nonmagnetic part 13 prevents a magnetic short circuit between the first magnetic part 12 and the second magnetic part 14. The first magnetic part 12, the nonmagnetic part 13, and the second magnetic part 14 are integrally connected by, for example, laser welding. In addition, the housing 11 may be formed into a cylindrical integrated body using a magnetic material, and the portion corresponding to the nonmagnetic portion 13 may be made nonmagnetic by heat processing.

ハウジング１１の軸方向の一方の端部には入口部材１５が設置されている。入口部材１５はハウジング１１の内周側に圧入されている。入口部材１５は流入口１６を有している。流入口１６には、図示しないポンプから流体が供給される。流入口１６に供給された流体は、フィルタ部材１７を経由してハウジング１１の内周側に流入する。フィルタ部材１７は、流体に含まれる異物を除去する。   An inlet member 15 is installed at one end of the housing 11 in the axial direction. The inlet member 15 is press-fitted on the inner peripheral side of the housing 11. The inlet member 15 has an inflow port 16. Fluid is supplied to the inlet 16 from a pump (not shown). The fluid supplied to the inflow port 16 flows into the inner peripheral side of the housing 11 via the filter member 17. The filter member 17 removes foreign matters contained in the fluid.

ハウジング１１の他方の端部には、ノズルホルダ２０が設置されている。ノズルホルダ２０は、筒状に形成され、内側に弁ボディとしてのノズルボディ３０が設置されている。ノズルボディ３０は、筒状に形成され、例えば圧入あるいは溶接などによりノズルホルダ２０に固定されている。ノズルボディ３０は、図１に示すように先端に近づくにつれて内径が小さくなる円錐台状の円錐台面３１に弁座３２を有している。円錐台面３１は、ノズルボディ３０の内壁面である。ノズルボディ３０は、円錐台面３１のハウジング１１とは反対側の端部に接続するサック部３３を有している。サック部３３には、噴孔４１および噴孔４２の一方の端部が開口している。噴孔４１および噴孔４２は、一方の端部がサック部３３に開口し、他方の端部がノズルボディ３０の外壁に開口している。   A nozzle holder 20 is installed at the other end of the housing 11. The nozzle holder 20 is formed in a cylindrical shape, and a nozzle body 30 as a valve body is installed inside. The nozzle body 30 is formed in a cylindrical shape, and is fixed to the nozzle holder 20 by, for example, press fitting or welding. As shown in FIG. 1, the nozzle body 30 has a valve seat 32 on a truncated cone-shaped truncated cone surface 31 whose inner diameter decreases as it approaches the tip. The truncated cone surface 31 is an inner wall surface of the nozzle body 30. The nozzle body 30 has a sack portion 33 that is connected to the end of the truncated cone surface 31 opposite to the housing 11. One end of the injection hole 41 and the injection hole 42 is opened in the sack part 33. The nozzle hole 41 and the nozzle hole 42 have one end opened to the sack portion 33 and the other end opened to the outer wall of the nozzle body 30.

弁部材としてのニードル５０は、図２に示すようにハウジング１１、ノズルホルダ２０およびノズルボディ３０の内周側に軸方向へ往復移動可能に収容されている。ニードル５０は、ノズルボディ３０と概ね同軸上に配置されている。ニードル５０は、図１に示すように円錐台面５１および円錐面５２を有している。円錐台面５１と円錐面５２との接続部はノズルボディ３０の弁座３２と接触可能なシール部５３となる。円錐台面５１および円錐面５２はニードル５０の外壁面を形成している。ニードル５０の外壁面とノズルボディ３０の円錐台面３１との間には、流体が流れる流体通路２１が形成される。   As shown in FIG. 2, the needle 50 as a valve member is accommodated on the inner peripheral side of the housing 11, the nozzle holder 20, and the nozzle body 30 so as to be reciprocally movable in the axial direction. The needle 50 is disposed substantially coaxially with the nozzle body 30. The needle 50 has a truncated cone surface 51 and a conical surface 52 as shown in FIG. A connecting portion between the truncated cone surface 51 and the conical surface 52 serves as a seal portion 53 that can contact the valve seat 32 of the nozzle body 30. The truncated cone surface 51 and the conical surface 52 form an outer wall surface of the needle 50. A fluid passage 21 through which fluid flows is formed between the outer wall surface of the needle 50 and the truncated cone surface 31 of the nozzle body 30.

インジェクタ１０は、図２に示すようにニードル５０を駆動する駆動部６０を有している。駆動部６０は、スプール６１、コイル６２、固定コア６３、可動コア６４および磁性部材６５を有している。スプール６１は、ハウジング１１の外周側に設置されている。スプール６１は、樹脂で筒状に形成され、外周側にコイル６２が巻かれている。コイル６２は、コネクタ部２２の端子２３に接続している。ハウジング１１を挟んでコイル６２の内周側には、固定コア６３が設置されている。固定コア６３は、例えば鉄などの磁性材料により筒状に形成され、ハウジング１１の内周側に例えば圧入などにより固定されている。   The injector 10 has a drive unit 60 that drives the needle 50 as shown in FIG. The drive unit 60 includes a spool 61, a coil 62, a fixed core 63, a movable core 64, and a magnetic member 65. The spool 61 is installed on the outer peripheral side of the housing 11. The spool 61 is formed of a resin in a cylindrical shape, and a coil 62 is wound on the outer peripheral side. The coil 62 is connected to the terminal 23 of the connector portion 22. A fixed core 63 is installed on the inner peripheral side of the coil 62 across the housing 11. The fixed core 63 is formed in a cylindrical shape from a magnetic material such as iron, and is fixed to the inner peripheral side of the housing 11 by, for example, press fitting.

可動コア６４は、ハウジング１１の内周側に軸方向へ往復移動可能に収容されている。可動コア６４は、例えば鉄などの磁性材料から筒状に形成されている。可動コア６４は、固定コア６３とは反対側の端部にニードル５０が接続している。ニードル５０のシール部５３とは反対側の端部は可動コア６４に固定されている。そのため、可動コア６４およびニードル５０は一体に軸方向へ往復移動する。   The movable core 64 is accommodated on the inner peripheral side of the housing 11 so as to be capable of reciprocating in the axial direction. The movable core 64 is formed in a cylindrical shape from a magnetic material such as iron. The needle 50 is connected to the end of the movable core 64 opposite to the fixed core 63. The end of the needle 50 opposite to the seal portion 53 is fixed to the movable core 64. Therefore, the movable core 64 and the needle 50 reciprocate in the axial direction integrally.

可動コア６４は、固定コア６３側の端部において付勢手段であるスプリング６６と接触している。スプリング６６は、一方の端部が可動コア６４に接しており、他方の端部がアジャスティングパイプ６７に接している。アジャスティングパイプ６７は、固定コア６３に圧入されている。アジャスティングパイプ６７の圧入量を調整することにより、スプリング６６の荷重は調整される。スプリング６６は、軸方向へ伸びる力を有している。そのため、ニードル５０および可動コア６４は、スプリング６６によりシール部５３が弁座３２へ着座する方向へ押し付けられている。磁性部材６５は、例えば鉄などの磁性材料により形成され、コイル６２の外周側を覆っている。   The movable core 64 is in contact with a spring 66 that is a biasing means at an end portion on the fixed core 63 side. One end of the spring 66 is in contact with the movable core 64, and the other end is in contact with the adjusting pipe 67. The adjusting pipe 67 is press-fitted into the fixed core 63. By adjusting the press-fitting amount of the adjusting pipe 67, the load of the spring 66 is adjusted. The spring 66 has a force extending in the axial direction. Therefore, the needle 50 and the movable core 64 are pressed by the spring 66 in the direction in which the seal portion 53 is seated on the valve seat 32. The magnetic member 65 is formed of, for example, a magnetic material such as iron and covers the outer peripheral side of the coil 62.

コイル６２に通電していないとき、可動コア６４およびニードル５０は弁座３２方向へ押し付けられ、シール部５３は弁座３２に着座する。コイル６２に通電していないとき、固定コア６３と可動コア６４との間には所定の隙間が形成されている。コイル６２に通電されると、可動コア６４は固定コア６３に吸引されるとともに、固定コア６３と可動コア６４とは互いに相対する面同士が接する。これにより、可動コア６４および可動コア６４と一体のニードル５０の移動量は制限される。すなわち、コイル６２の非通電時における固定コア６３と可動コア６４との間の距離は、ニードル５０のリフト量に対応する。   When the coil 62 is not energized, the movable core 64 and the needle 50 are pressed toward the valve seat 32, and the seal portion 53 is seated on the valve seat 32. When the coil 62 is not energized, a predetermined gap is formed between the fixed core 63 and the movable core 64. When the coil 62 is energized, the movable core 64 is attracted to the fixed core 63, and the fixed core 63 and the movable core 64 are in contact with each other on mutually opposing surfaces. Thereby, the movement amount of the needle 50 integral with the movable core 64 and the movable core 64 is limited. That is, the distance between the fixed core 63 and the movable core 64 when the coil 62 is not energized corresponds to the lift amount of the needle 50.

次に、噴孔４１、４２の近傍について詳細に説明する。
図１に示すように、ノズルボディ３０は円錐台面３１に弁座３２を有している。弁座３２には、ニードル５０のシール部５３が着座可能である。円錐台面３１の下流側すなわち弁座３２とは反対側の端部にはサック部３３が接続している。サック部３３は、ノズルボディ３０の内壁面により形成されている。第一実施形態の場合、サック部３３は、円錐台面３１と接続しハウジング１１とは反対側へ伸びる円筒面３３１と、円筒面３３１の円錐台面３１とは反対側に接続する半球状面３３２とから構成されている。 Next, the vicinity of the nozzle holes 41 and 42 will be described in detail.
As shown in FIG. 1, the nozzle body 30 has a valve seat 32 on a truncated cone surface 31. A seal portion 53 of the needle 50 can be seated on the valve seat 32. A sack 33 is connected to the downstream side of the truncated cone surface 31, that is, the end opposite to the valve seat 32. The sack portion 33 is formed by the inner wall surface of the nozzle body 30. In the case of the first embodiment, the sack portion 33 is connected to the truncated cone surface 31 and extends to the opposite side of the housing 11, and the hemispherical surface 332 connected to the opposite side of the cylindrical surface 331 to the truncated cone surface 31. It is composed of

サック部３３を形成するノズルボディ３０の内壁面には、噴孔４１および噴孔４２の入口側が開口している。ノズルボディ３０には、ノズルボディ３０の軸方向へ重ねられている二つの噴孔４１および噴孔４２が設置されている。噴孔４１および噴孔４２は、サック部３３とは反対側の端部がノズルボディ３０の外壁に開口している。これにより、噴孔４１および噴孔４２は、ノズルボディ３０を貫いてサック部３３とノズルボディ３０の外壁とを接続している。噴孔４１および噴孔４２は、ノズルボディ３０の軸に対し所定の角度を形成している。   On the inner wall surface of the nozzle body 30 forming the sack portion 33, the inlet side of the nozzle hole 41 and the nozzle hole 42 is opened. The nozzle body 30 is provided with two injection holes 41 and 42 that are overlapped in the axial direction of the nozzle body 30. The nozzle hole 41 and the nozzle hole 42 are open to the outer wall of the nozzle body 30 at the end opposite to the sack portion 33. Thereby, the nozzle hole 41 and the nozzle hole 42 penetrate the nozzle body 30 and connect the sack portion 33 and the outer wall of the nozzle body 30. The nozzle hole 41 and the nozzle hole 42 form a predetermined angle with respect to the axis of the nozzle body 30.

噴孔４１および噴孔４２は、図３に示すようにノズルボディ３０の軸方向の長さに対し周方向の長さが大きな扁平なスリット状に形成されている。すなわち、噴孔４１はノズルボディ３０の周方向の幅Ｗ１が軸方向の高さＨ１より大きく、噴孔４２は幅Ｗ２が高さＨ２より大きい。また、弁座３２に近い噴孔４１は、弁座３２から遠い噴孔４２よりも開口面積が大きい。流体通路２１を通過する流体は、弁座３２に近いすなわち流体通路２１に近くなるほど圧力が高い。そのため、噴孔４１から噴射される流体は、噴孔４２から噴射される流体よりも圧力が高い。流体は、噴射される圧力が高くなるほど微粒化が促進される。そのため、弁座３２に近い噴孔４１の開口面積を拡大することにより、噴孔４１からは圧力の高い流体が大きな流量で噴射される。   As shown in FIG. 3, the nozzle hole 41 and the nozzle hole 42 are formed in a flat slit shape having a circumferential length larger than the axial length of the nozzle body 30. That is, the nozzle hole 30 has a circumferential width W1 larger than the axial height H1, and the nozzle hole 42 has a width W2 larger than the height H2. Further, the nozzle hole 41 near the valve seat 32 has a larger opening area than the nozzle hole 42 far from the valve seat 32. The fluid passing through the fluid passage 21 has a higher pressure as it is closer to the valve seat 32, that is, closer to the fluid passage 21. Therefore, the fluid ejected from the nozzle hole 41 has a higher pressure than the fluid ejected from the nozzle hole 42. As for the fluid, atomization is promoted as the jetted pressure increases. Therefore, by expanding the opening area of the injection hole 41 close to the valve seat 32, a fluid having a high pressure is injected from the injection hole 41 at a large flow rate.

サック部３３は、弁座３２とは反対側に半球状面３３２を有している。そのため、噴孔４１および噴孔４２をノズルボディ３０の軸方向へ重ねて配置する場合、弁座３２から遠い噴孔４２は幅Ｗ２を大きくすることが困難である。特に、噴孔４１と噴孔４２とから噴射される流体が形成する噴霧の干渉を防止するために噴孔４１と噴孔４２との間の距離を大きくすると、噴孔４２の幅Ｗ２の確保は困難になる。一方、本実施形態の場合、噴孔４２に比較して噴孔４１の開口面積を拡大しているため、噴孔４１により所定の流量の大部分が確保される。そのため、噴孔４２の幅Ｗ２を必要以上に拡大することなく流体の流量は確保される。その結果、噴孔４２はノズルボディ３０の先端側へ容易に設置することができる。   The sack portion 33 has a hemispherical surface 332 on the side opposite to the valve seat 32. Therefore, when the nozzle hole 41 and the nozzle hole 42 are arranged so as to overlap in the axial direction of the nozzle body 30, it is difficult to increase the width W2 of the nozzle hole 42 far from the valve seat 32. In particular, when the distance between the nozzle hole 41 and the nozzle hole 42 is increased in order to prevent the interference of the spray formed by the fluid injected from the nozzle hole 41 and the nozzle hole 42, the width W2 of the nozzle hole 42 is secured. Becomes difficult. On the other hand, in the case of this embodiment, since the opening area of the nozzle hole 41 is enlarged as compared with the nozzle hole 42, most of the predetermined flow rate is secured by the nozzle hole 41. Therefore, the flow rate of the fluid is ensured without increasing the width W2 of the nozzle hole 42 more than necessary. As a result, the nozzle hole 42 can be easily installed on the tip side of the nozzle body 30.

噴孔４１は、ノズルボディ３０の周方向の長さすなわち幅Ｗ１を噴孔４２の幅Ｗ２よりも拡大することにより、開口面積を噴孔４２よりも拡大している。本実施形態では、噴孔４１の高さＨ１は、噴孔４２の高さＨ２とほぼ同一である。噴孔４１は、幅Ｗ１を拡大することにより、軸方向の長さすなわち高さＨ１を拡大する場合と比較してより扁平となる。そのため、噴孔４１から噴射される流体は、薄い液膜状の噴霧を形成する。これにより、噴孔４１から噴射される流体は微粒化が促進される。   The nozzle hole 41 has an opening area larger than that of the nozzle hole 42 by expanding the circumferential length of the nozzle body 30, that is, the width W <b> 1 larger than the width W <b> 2 of the nozzle hole 42. In the present embodiment, the height H <b> 1 of the nozzle hole 41 is substantially the same as the height H <b> 2 of the nozzle hole 42. The nozzle hole 41 becomes flatter by enlarging the width W1, as compared with the case where the axial length, that is, the height H1 is enlarged. Therefore, the fluid ejected from the nozzle hole 41 forms a thin liquid film spray. Thereby, atomization of the fluid ejected from the nozzle hole 41 is promoted.

本実施形態の場合、図１に示すように、噴孔４１の軸Ｌ１および噴孔４２の軸Ｌ２は、流体通路２１を流れる流体の主流とずれている。ここで、主流とは、流体通路２１を流れる流体のうち流量および流速の大きな部分をいう。この主流は、ノズルボディ３０の内壁面を構成する円錐台面３１とニードル５０の外壁面を構成する円錐台面５１とがなす角度の二等分線Ｌｅにほぼ一致する。すなわち、流体は、円錐台面３１と円錐台面５１とがなす角度の二等分線Ｌｅに沿った部分において流量および流速が最も大きくなる。そのため、流体通路２１を流れる流体は、二等分線Ｌｅに沿って主流が形成され、形成された主流は噴孔４１および噴孔４２のサック部３３側の開口に向けて流れる。   In the present embodiment, as shown in FIG. 1, the axis L <b> 1 of the injection hole 41 and the axis L <b> 2 of the injection hole 42 are shifted from the main flow of the fluid flowing through the fluid passage 21. Here, the main flow refers to a portion of the fluid flowing through the fluid passage 21 that has a large flow rate and flow velocity. This main flow substantially coincides with the bisector Le of the angle formed by the truncated cone surface 31 constituting the inner wall surface of the nozzle body 30 and the truncated cone surface 51 constituting the outer wall surface of the needle 50. That is, the flow rate and the flow rate of the fluid are greatest at a portion along the bisector Le of the angle formed by the truncated cone surface 31 and the truncated cone surface 51. Therefore, a main flow of the fluid flowing through the fluid passage 21 is formed along the bisector Le, and the formed main flow flows toward the openings of the nozzle holes 41 and the nozzle holes 42 on the sack portion 33 side.

本実施形態の場合、噴孔４１の軸Ｌ１および噴孔４２の軸Ｌ２と主流が形成される二等分線Ｌｅとは、それぞれずれている。すなわち、二等分線Ｌｅを延長したとき、二等分線Ｌｅは噴孔４１の入口側開口部と噴孔４２の入口側開口部との間に交差するようになっている。これにより、流体通路２１を通過した流体は、ノズルボディ３０の軸方向において噴孔４１と噴孔４２との間に位置するノズルボディ３０の内壁面３０ａに衝突し、噴孔４１および噴孔４２へ直接流入することを防止できる。   In the case of the present embodiment, the axis L1 of the nozzle hole 41 and the axis L2 of the nozzle hole 42 are shifted from the bisector Le forming the main flow. That is, when the bisector Le is extended, the bisector Le intersects between the inlet side opening of the nozzle hole 41 and the inlet side opening of the nozzle hole 42. Thereby, the fluid that has passed through the fluid passage 21 collides with the inner wall surface 30 a of the nozzle body 30 located between the nozzle hole 41 and the nozzle hole 42 in the axial direction of the nozzle body 30, and the nozzle hole 41 and the nozzle hole 42. Can be prevented from flowing directly into

次に、上記の構成によるインジェクタ１０の作動について説明する。
図１に示すコイル６２への通電が停止されているとき、固定コア６３と可動コア６４との間には磁気吸引力が発生しない。そのため、可動コア６４はスプリング６６の押し付け力により固定コア６３とは反対側へ移動している。その結果、コイル６２への通電が停止されているとき、ニードル５０のシール部５３は弁座３２に着座している。したがって、流体は噴孔４１および噴孔４２から噴射されない。 Next, the operation of the injector 10 having the above configuration will be described.
When energization of the coil 62 shown in FIG. 1 is stopped, no magnetic attractive force is generated between the fixed core 63 and the movable core 64. Therefore, the movable core 64 is moved to the opposite side to the fixed core 63 by the pressing force of the spring 66. As a result, when energization to the coil 62 is stopped, the seal portion 53 of the needle 50 is seated on the valve seat 32. Therefore, the fluid is not ejected from the nozzle hole 41 and the nozzle hole 42.

コイル６２に通電されると、コイル６２に発生した磁界により磁性部材６５、第一磁性部１２、可動コア６４、固定コア６３および第二磁性部１４に磁束が流れ、磁気回路が形成される。これにより、固定コア６３と可動コア６４との間には磁気吸引力が発生する。固定コア６３と可動コア６４との間に発生する磁気吸引力がスプリング６６の押し付け力よりも大きくなると、可動コア６４は固定コア６３方向へ移動する。その結果、ニードル５０のシール部５３は弁座３２から離座する。   When the coil 62 is energized, magnetic flux flows through the magnetic member 65, the first magnetic part 12, the movable core 64, the fixed core 63, and the second magnetic part 14 due to the magnetic field generated in the coil 62, thereby forming a magnetic circuit. As a result, a magnetic attractive force is generated between the fixed core 63 and the movable core 64. When the magnetic attractive force generated between the fixed core 63 and the movable core 64 becomes larger than the pressing force of the spring 66, the movable core 64 moves toward the fixed core 63. As a result, the seal portion 53 of the needle 50 is separated from the valve seat 32.

流入口１６からインジェクタ１０の内部へ流入した流体は、フィルタ部材１７、入口部材１５の内周側、アジャスティングパイプ６７の内周側、可動コア６４の内周側、可動コア６４を貫く流体孔６８およびノズルホルダ２０の内周側を経由して流体通路２４へ流入する。流体通路２４へ流入した流体は、弁座３２から離座したニードル５０とノズルボディ３０との間に形成される流体通路２１、およびサック部３３を経由して噴孔４１および噴孔４２へ流入する。これにより、噴孔４１および噴孔４２から流体が噴射される。   The fluid that has flowed into the injector 10 from the inlet 16 is a fluid hole that penetrates the filter member 17, the inner peripheral side of the inlet member 15, the inner peripheral side of the adjusting pipe 67, the inner peripheral side of the movable core 64, and the movable core 64. 68 and the inside of the nozzle holder 20 flows into the fluid passage 24. The fluid that has flowed into the fluid passage 24 flows into the nozzle hole 41 and the nozzle hole 42 through the fluid passage 21 formed between the needle 50 separated from the valve seat 32 and the nozzle body 30 and the sack portion 33. To do. Thereby, the fluid is ejected from the nozzle hole 41 and the nozzle hole 42.

コイル６２への通電を停止すると、固定コア６３と可動コア６４との間の磁気吸引力は消滅する。これにより、可動コア６４およびニードル５０はスプリング６６の押し付け力により固定コア６３とは反対側へ移動する。そのため、ニードル５０のシール部５３は再び弁座３２に着座し、流体通路２１と噴孔４１および噴孔４２との間の流体の流れは遮断される。したがって、流体の噴射は終了する。   When energization of the coil 62 is stopped, the magnetic attractive force between the fixed core 63 and the movable core 64 disappears. As a result, the movable core 64 and the needle 50 move to the opposite side of the fixed core 63 by the pressing force of the spring 66. Therefore, the seal portion 53 of the needle 50 is again seated on the valve seat 32, and the flow of fluid between the fluid passage 21, the injection hole 41, and the injection hole 42 is blocked. Accordingly, the ejection of the fluid ends.

以上、説明したように、第１実施形態では噴孔４１の開口面積は噴孔４２に比較して大きい。そのため、弁座３２に近く圧力の高い流体は噴孔４１から噴射される。また、噴孔４１からは噴孔４２に比較して多くの流体が噴射される。これにより、噴孔４１から噴射される流体は、高い圧力を利用して積極的に微粒化が図られる。一方、噴孔４２は噴孔４１に比較して開口面積が小さいため、噴孔４２へ流入する流体は噴孔４２によって絞り込まれる。これにより、弁座３２から遠い噴孔４２を流れる流体は、弁座３２付近と比較して圧力が低くても、噴孔４２により絞り込まれて圧力が上昇する。そのため、噴孔４２から噴射される流体も微粒化が図られる。したがって、噴孔４１および噴孔４２から噴射される流体の微粒化を全体として促進することができる。   As described above, the opening area of the nozzle hole 41 is larger than that of the nozzle hole 42 in the first embodiment. Therefore, a fluid close to the valve seat 32 and having a high pressure is ejected from the nozzle hole 41. Further, a larger amount of fluid is ejected from the nozzle hole 41 than the nozzle hole 42. Thereby, the fluid injected from the injection hole 41 is positively atomized by using a high pressure. On the other hand, since the nozzle hole 42 has a smaller opening area than the nozzle hole 41, the fluid flowing into the nozzle hole 42 is narrowed by the nozzle hole 42. As a result, the fluid flowing through the nozzle hole 42 far from the valve seat 32 is squeezed by the nozzle hole 42 and the pressure rises even if the pressure is lower than that near the valve seat 32. Therefore, atomization of the fluid ejected from the nozzle hole 42 is also achieved. Therefore, atomization of the fluid ejected from the nozzle hole 41 and the nozzle hole 42 can be promoted as a whole.

特に、本実施形態のように、インジェクタ１０を排気浄化装置に適用する場合、流体の圧力は数ＭＰａ程度であり、例えば直噴式のエンジンに適用されるインジェクタと比較して流体の圧力が低い。そのため、弁座３２に近く圧力の高い流体を積極的に噴孔４１から噴射することにより、流体の圧力に関わらず流体の微粒化を促進することができる。また、流体の圧力が低い場合、所定量の流体を噴射するためには噴孔４１の面積を拡大する必要がある。本実施形態では、噴孔４１の開口面積を拡大することにより、十分な流量かつ圧力の流体を噴射することができる。   In particular, when the injector 10 is applied to an exhaust gas purification apparatus as in this embodiment, the pressure of the fluid is about several MPa, and the pressure of the fluid is lower than that of an injector applied to, for example, a direct injection engine. Therefore, by atomizing a fluid close to the valve seat 32 and having a high pressure from the nozzle hole 41, atomization of the fluid can be promoted regardless of the pressure of the fluid. When the fluid pressure is low, the area of the nozzle hole 41 needs to be enlarged in order to eject a predetermined amount of fluid. In the present embodiment, a fluid having a sufficient flow rate and pressure can be ejected by enlarging the opening area of the nozzle hole 41.

第１実施形態では、噴孔４１は幅Ｗ１を拡大することにより開口面積を拡大している。これにより、噴孔４１は扁平なスリット状となる。そのため、噴孔４１から噴射される流体は、液膜状の噴霧を形成する。したがって、流体の微粒化を促進することができる。
第１実施形態では、噴孔４１の軸Ｌ１および噴孔４２の軸Ｌ２は円錐台面３１と円錐台面５１とがなす角度の二等分線Ｌｅからずれている。そのため、流体通路２１において二等分線Ｌｅに沿って流れる流体の主流は、噴孔４１または噴孔４２へ直接流入しない。これにより、ニードル５０の偏心などにより、主流の位置が変化する場合でも、噴孔４１および噴孔４２から噴射される流体は主流の変化の影響を受けない。したがって、噴孔４１および噴孔４２から噴射される流体は安定した噴霧を形成することができる。さらに、主流が噴孔４１と噴孔４２との間においてノズルボディ３０の内壁に衝突することにより、流体が有している運動エネルギーは微粒化のエネルギーに変換される。したがって、流体の微粒化を促進することができる。 In the first embodiment, the nozzle hole 41 expands the opening area by expanding the width W1. Thereby, the nozzle hole 41 becomes a flat slit shape. Therefore, the fluid ejected from the nozzle hole 41 forms a liquid film spray. Therefore, atomization of the fluid can be promoted.
In the first embodiment, the axis L1 of the nozzle hole 41 and the axis L2 of the nozzle hole 42 are offset from the bisector Le of the angle formed by the truncated cone surface 31 and the truncated cone surface 51. Therefore, the main flow of the fluid flowing along the bisector Le in the fluid passage 21 does not directly flow into the nozzle hole 41 or the nozzle hole 42. Thereby, even when the position of the main flow changes due to the eccentricity of the needle 50 or the like, the fluid ejected from the nozzle holes 41 and 42 is not affected by the change of the main flow. Therefore, the fluid ejected from the nozzle hole 41 and the nozzle hole 42 can form a stable spray. Further, when the main flow collides with the inner wall of the nozzle body 30 between the nozzle holes 41 and 42, the kinetic energy of the fluid is converted into atomization energy. Therefore, atomization of the fluid can be promoted.

（第２実施形態）
本発明の第２実施形態によるインジェクタの噴孔の近傍を図４に示す。なお、第１実施形態と実質的に同一の構成部位には同一の符号を付し、説明を省略する。
図４に示すように、第２実施形態では第１実施形態と同様に弁座３２に近い噴孔７１の開口面積は弁座３２から遠い噴孔７２よりも大きい。第２実施形態では、噴孔７１は、噴孔７２に比較してノズルボディ３０の周方向の幅Ｗ３だけでなく軸方向の高さＨ３も拡大している。すなわち、噴孔７１の幅Ｗ３および高さＨ３は、噴孔７２の幅Ｗ４および高さＨ４よりも大きい。噴孔７１の高さＨ３を拡大して開口面積を拡大することにより、噴孔７１から噴射される噴霧の形状は液柱状になるものの、噴孔７１から噴射される流体の流量は増大する。そのため、例えば圧力が比較的高い流体を噴射する場合、流体の所定の噴射量を容易に確保することができる。
また、噴孔７２は、高さＨ３を拡大して開口面積を拡大している。これにより、弁座３２に近い圧力の高い流体が積極的に噴孔７２から噴射される。したがって、流体の微粒化を促進することができる。 (Second Embodiment)
FIG. 4 shows the vicinity of the injection hole of the injector according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the component substantially the same as 1st Embodiment, and description is abbreviate | omitted.
As shown in FIG. 4, in the second embodiment, the opening area of the injection hole 71 near the valve seat 32 is larger than that of the injection hole 72 far from the valve seat 32 as in the first embodiment. In the second embodiment, the nozzle hole 71 is expanded not only in the circumferential width W3 of the nozzle body 30 but also in the axial height H3 as compared with the nozzle hole 72. That is, the width W3 and height H3 of the nozzle hole 71 are larger than the width W4 and height H4 of the nozzle hole 72. By enlarging the height H3 of the nozzle hole 71 and increasing the opening area, the shape of the spray injected from the nozzle hole 71 becomes a liquid column, but the flow rate of the fluid injected from the nozzle hole 71 increases. Therefore, for example, when a fluid having a relatively high pressure is ejected, a predetermined ejection amount of the fluid can be easily ensured.
Moreover, the nozzle hole 72 expands the opening area by expanding the height H3. As a result, a high-pressure fluid close to the valve seat 32 is positively injected from the injection hole 72. Therefore, atomization of the fluid can be promoted.

（その他の実施形態）
以上、説明した複数の実施形態では、サック部３３を円筒状面３３１と半球状面３３２とから構成する例について説明した。しかし、サック部３３は、単一の半球形状、あるいは単一の円筒状など、任意の形状を選択することができる。また、複数の実施形態では、二つの噴孔４１、４２または噴孔７１、７２をノズルボディ３０の軸方向へ重ねて設置する構成について説明した。しかし、二つに限らず三つ以上の噴孔をノズルボディ３０の軸方向へ重ねて設置してもよい。 (Other embodiments)
As described above, in the plurality of embodiments described above, the example in which the sack portion 33 includes the cylindrical surface 331 and the hemispherical surface 332 has been described. However, the sack portion 33 can select an arbitrary shape such as a single hemispherical shape or a single cylindrical shape. Further, in the plurality of embodiments, the configuration in which the two nozzle holes 41 and 42 or the nozzle holes 71 and 72 are overlapped in the axial direction of the nozzle body 30 has been described. However, the number is not limited to two, and three or more nozzle holes may be stacked in the axial direction of the nozzle body 30.

本発明の第１実施形態によるインジェクタの要部を示す断面図である。It is sectional drawing which shows the principal part of the injector by 1st Embodiment of this invention. 本発明の第１実施形態によるインジェクタを示す断面図である。It is sectional drawing which shows the injector by 1st Embodiment of this invention. 図１の矢印III方向から見た矢視図である。It is the arrow line view seen from the arrow III direction of FIG. 本発明の第２実施形態によるインジェクタを示す図であって、図３に対応する矢視図である。It is a figure which shows the injector by 2nd Embodiment of this invention, Comprising: It is an arrow line view corresponding to FIG.

符号の説明Explanation of symbols

１０ インジェクタ（流体噴射弁）、２１ 流体通路、３０ ノズルボディ（弁ボディ）、３１ 円錐台面（内壁面）、３２ 弁座、４１ 噴孔、４２ 噴孔、５０ ニードル（弁部材）、５１ 円錐台面（外壁面）、５３ シール部、７１ 噴孔、７２ 噴孔   DESCRIPTION OF SYMBOLS 10 Injector (fluid injection valve), 21 Fluid passage, 30 Nozzle body (valve body), 31 Frustum surface (inner wall surface), 32 Valve seat, 41 Injection hole, 42 Injection hole, 50 Needle (valve member), 51 Frustum surface (Outer wall surface), 53 seal part, 71 injection hole, 72 injection hole

Claims (1)

内壁面に弁座を有する弁ボディと、
前記内壁面との間に流体通路を形成する外壁面、および前記外壁面に前記弁座と接触可能なシール部を有し、前記シール部が前記弁座から離座または前記弁座に着座することにより前記流体通路を開閉する弁部材とを備え、
前記弁ボディは、流体流れ方向において前記弁座の下流側に内壁と外壁とを接続し軸方向に重ねて配置されている二つ以上の噴孔を有し、前記二つ以上の噴孔のうちの前記弁座に近い第１噴孔は前記弁座から遠い第２噴孔よりも開口面積が大きく、
前記第１噴孔は、前記第２噴孔よりも前記弁ボディの周方向の長さが大きく、
前記流体通路を形成する前記弁ボディの前記内壁面と前記弁部材の前記外壁面とがなす角度を二等分する仮想二等分線は、前記二つ以上の噴孔のいずれの軸ともずれており、
前記仮想二等分線は、前記第１噴孔の入口側開口部と前記第２噴孔の入口側開口部との間に交差することを特徴とする流体噴射弁。 A valve body having a valve seat on the inner wall;
An outer wall surface that forms a fluid passage between the inner wall surface and a seal portion that can contact the valve seat on the outer wall surface, and the seal portion is separated from the valve seat or seated on the valve seat. A valve member for opening and closing the fluid passage by,
The valve body has two or more nozzle holes that are connected to an inner wall and an outer wall on the downstream side of the valve seat in the fluid flow direction and are arranged to overlap in the axial direction . the first injection holes closer to the valve seat of the out is rather large opening area than distant second injection holes from the valve seat,
The first nozzle hole has a larger circumferential length of the valve body than the second nozzle hole,
A virtual bisector that bisects the angle formed by the inner wall surface of the valve body and the outer wall surface of the valve member that forms the fluid passage is offset from any axis of the two or more nozzle holes. And
The fluid injection valve according to claim 1, wherein the virtual bisector intersects between an inlet side opening of the first nozzle hole and an inlet side opening of the second nozzle hole .
JP2004146071A 2004-05-17 2004-05-17 Fluid injection valve Expired - Fee Related JP4129688B2 (en)

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JP2004146071A JP4129688B2 (en) 2004-05-17 2004-05-17 Fluid injection valve
CNB2005100702471A CN100396909C (en) 2004-05-17 2005-05-13 Jet for spraying pressure fluid
DE200510022562 DE102005022562A1 (en) 2004-05-17 2005-05-17 Injector for supplying fuel to combustion chamber of engine, has nozzle that is arranged near valve seat and has larger opening area than nozzle which is arranged farther from valve seat

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DE102006044080B4 (en) * 2006-09-20 2023-10-12 Robert Bosch Gmbh Method for operating a reagent metering valve and device for carrying out the method
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EP2014885B1 (en) * 2007-07-09 2010-11-17 Delphi Technologies Holding S.à.r.l. A reagent dosing system
DE102009027693A1 (en) * 2009-07-14 2011-05-05 Robert Bosch Gmbh Dosing module for a liquid reducing agent
JP2017008861A (en) * 2015-06-24 2017-01-12 株式会社デンソー Fuel injection nozzle
CN109236432A (en) * 2017-07-11 2019-01-18 天纳克（苏州）排放系统有限公司 nozzle
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