EP3155253A1 - Dispositif d'injection - Google Patents

Dispositif d'injection

Info

Publication number
EP3155253A1
EP3155253A1 EP15726097.7A EP15726097A EP3155253A1 EP 3155253 A1 EP3155253 A1 EP 3155253A1 EP 15726097 A EP15726097 A EP 15726097A EP 3155253 A1 EP3155253 A1 EP 3155253A1
Authority
EP
European Patent Office
Prior art keywords
valve
injection device
tip
hole plate
piston
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP15726097.7A
Other languages
German (de)
English (en)
Inventor
Rainer Haeberer
Thorsten Stoeberl
Dirk Welting
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3155253A1 publication Critical patent/EP3155253A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F01N3/28—Construction of catalytic reactors
    • 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
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to an injection device, in particular for a
  • SCR selective catalytic reduction
  • Exhaust gas aftertreatment agent is sucked from a tank by an injector and then injected into the exhaust gas.
  • Injection device is known for example from EP 1 878 920 Bl.
  • the injection device has a valve piston which first compresses exhaust gas aftertreatment agent by means of an electromagnetic actuator and then injects it into the exhaust gas. Subsequently, the valve piston is moved back by a spring element into its initial position, whereby new reducing agent is sucked.
  • the exhaust gas aftertreatment agent is mixed particularly well with the exhaust gas. For this it is advantageous if the injected spray is very fine, or has small drops.
  • injection devices are provided which have an internal-opening injection valve.
  • An inwardly opening injection valve is understood to mean a valve in which a valve tip of the valve piston is connected to an upstream of a throughflow opening provided valve seat - in the flow direction of the
  • the injection device according to the invention with the features of claim 1 has the advantage that on the one hand a particularly fine spray is generated, and that, secondly, in particular the valve seat of the injection valve is securely protected from, for example present in the exhaust soot particles, so that a long life of the injector can be ensured can.
  • the injection device according to the invention is characterized in that it has a pressure-controlled and externally-opening injection valve, which has a flow opening in a valve body penetrating and axially displaceable valve piston having a valve tip at one end, a valve opening associated with the flow opening and at least one
  • Valve piston having the valve tip for closing the flow opening against the valve seat urging spring element, wherein the valve tip is axially displaceable in a flow chamber, on the one hand by the
  • Injector produces a very fine spray.
  • the spray is further distributed through the injection openings formed therein, so that it is also possible to set up advantageous collision beams (Collision Beams), which lead to further droplet reduction.
  • collision Beams advantageous collision beams
  • the spray hole plate covers the valve piston and the valve opening substantially or at least to a large extent and thereby protects against direct contact with the exhaust gas of the internal combustion engine.
  • Valve tip on its opposite side of the seat has a cooperating with the spray hole plate axial stop. Due to the advantageous development is thus achieved that the valve piston is at most so far displaced until it against the spray hole plate with the
  • Axial stop abuts.
  • the spray hole plate thus offers another function, namely a stroke limiter for the valve piston.
  • the maximum stroke of the valve piston can be easily adjusted.
  • a narrow maximum gap between the valve tip and the valve seat can be set and ensured at any time.
  • the axial stop is formed by an axial projection on the flat bottom of the valve tip associated with the spray-hole plate.
  • Spray resolution is further improved. Furthermore, it is preferably provided that the flow chamber a
  • Has longitudinal section which corresponds at least substantially to the longitudinal section of the valve tip. This ensures that a narrow annular flow channel between the valve tip and the valve body in the
  • Flow chamber is formed, which leads to an optimal media management or distribution of the liquid exhaust aftertreatment agent.
  • valve tip and the valve body are formed such that a narrow gap between valve body and valve tip forms when the valve piston is in its maximum stroke position, so that the liquid is accelerated very strong according to the equation of continuity to produce a very fine spray.
  • the valve piston is provided with a thread-shaped or helical groove. The thread-shaped groove extends in particular along a cylindrical piston stem of the valve piston up to the valve tip.
  • the valve tip itself is preferably formed groove-free.
  • the flow-through opening in the valve body has a tapering cross-section, viewed in the direction of the valve seat, viewed in the direction of flow.
  • the valve piston has a substantially constant diameter up to the valve tip, so that the flow space between valve piston and valve body in the region of
  • the injection device a
  • Injection valve forms a pump-nozzle unit. This ensures a particularly compact injection device which offers the advantages described above with regard to the fine spray and the safety of the injection valve against contamination.
  • the inventive method with the features of claim 9 is characterized in that for setting a maximum piston stroke of the valve piston, the spray hole plate is plastically deformed. As a result, the maximum valve lift of the valve piston can be adjusted in a simple manner. In the following, the invention will be explained in more detail with reference to the drawing. The only one shows
  • FIG. 1 An injection device in a simplified longitudinal sectional view.
  • the figure shows a simplified longitudinal sectional view of a
  • Injection device 1 which is a pressure-controlled and outwardly opening
  • the pressure generator 3 can be, for example, a particularly electrically operated hydraulic pump.
  • the injection valve 2 has a housing 4, in which a valve body 5 fixed and a valve piston 6 are arranged axially displaceable.
  • the valve body 5 has a throughflow opening 7, which is at least substantially penetrated by the valve piston 6.
  • the throughflow opening 7 tapers - seen in the longitudinal direction - towards its center, so that it has a first and a second section, which are each at least substantially V-shaped widening outwardly. At the narrowest point of the
  • valve body 5 has a valve seat 8.
  • valve tip 9 of the valve piston 6, which also has a V-shaped longitudinal section, so that the valve piston 6 widens in its cross-section to its end having the valve tip 9.
  • the valve tip 9 is thus formed or arranged in the shape of a truncated cone at the end of the valve piston 6, so that the valve seat 8 can co-operate with the conical jacket wall of the valve tip 9 to close the throughflow opening 7.
  • the valve tip 9 is thus at least partially provided with a larger diameter than the
  • the piston At the opposite end of the valve tip 9, the piston is provided with a support plate 10, which is held axially fixed to the valve piston 6. Between the support plate 10 and the valve body 5, a spring element 11, which is presently designed as a helical spring, held biased, so that the spring element 11 via the support plate 10, the valve piston 6 with the valve tip 9 against the valve seat 8 pulls or urges. The spring element 11 is thus on the Valve seat 8 opposite side of the taper of the
  • Throughflow opening 7 is arranged.
  • valve body 5 is preferred, as in the present
  • an annular recess 12 in which the coil spring rests partially to their leadership.
  • a spacer ring 13 is provided in the recess 12 .
  • Influence spring element 11 in a simple manner or adjust.
  • valve tip 9 lies in the position of the valve piston 6 closing the throughflow opening 7 in the second section of FIG.
  • a spray hole plate 14 which is in particular designed as a spray perforated disk arranged such that it extends over the flow opening 7 of the valve tip 9 and the valve seat 6 opposite, so that between the spray hole plate 14 and the valve body 5, a flow chamber 15 is formed is, in which the valve tip 9 rests.
  • the spray hole plate 14 is arranged in the closed state of the injection valve 2 spaced from the valve tip 9, so that the valve piston 6 axially displaceable in the direction of the spray hole plate 14 and thereby of the
  • Valve seat 8 to release the flow opening 7 is releasable.
  • an axial projection 17 is provided centrally, which forms an axial stop 18 which cooperates with the spray hole plate 14 when the valve piston.
  • the spray hole plate 14 thus allows the maximum stroke of the valve piston 6 set in a simple manner.
  • the spray hole plate 14 is formed plastically deformable, so that by deforming the spray hole plate 14 of the piston stroke of the valve piston 6 in the Nachhinein is still adjustable.
  • the underside 16 of the valve tip 9 is preferably planar or flat apart from the axial projection 17, in particular with a parallel to the spray hole plate 14 extending surface, so in the fully or maximum displaced state of the valve piston 6, a narrow gap between the valve tip 9 and the spray hole plate 14 is formed ,
  • the contour of the flow opening 7 in the region of the flow chamber 15 is formed such that between the valve tip 9 and the valve body 5 in the maximum displaced state of the valve piston 6 is a substantially uniform us narrow gap between the valve tip 9 and valve body 5 is present, the flow rates too high leads.
  • the spray hole plate 14 is itself provided with a plurality of spray openings 19, which are distributed in particular uniformly over the circumference of the spray hole plate 14.
  • Laser processing especially by ultra-short pulses (U KP) made, so they can have very small diameters.
  • U KP ultra-short pulses
  • the pressure generator 3 promotes hydraulic medium in an antechamber 20 of the injection valve 2, in which also the spring element 11 and the support plate 10 are arranged. From there, the medium flows into the flow opening 7 and builds up a pressure which counteracts the spring force 11. Exceeds the generated hydraulic pressure, the force of the spring element 7, so the urges
  • valve piston 6 in the direction of the spray hole plate 14 until the axial stop 18 hits the spray hole plate 14. Due to the advantageous embodiment of the throughflow opening 7, the hydraulic medium is accelerated in the direction of the narrowest point of the throughflow opening 7, whereby a high quality spray is already produced in the narrow gap between valve seat 8 and valve tip 9.
  • the valve seat 8 is located
  • the valve piston 6 is provided with a helical or thread-shaped groove 21 which extends from the cylindrical shell wall of the shaft of the valve piston 6 to the valve tip 9.
  • the groove 21 ends at the valve tip 9, so that the valve tip 9 is formed even groove-free, and in particular in the region of the valve seat 8 ensures a continuous annular contact contact.
  • the groove 21, in conjunction with the valve seat 8 towards tapering gap between the valve body 5 and the valve piston 6 causes the
  • Hydraulic medium in addition to the speed increase also experiences a twist, which improves the spray dissolution. Due to the advantageously designed throughflow opening 7 in the region of the flow chamber 15, it is achieved that the hydraulic medium is optimally guided in the flow chamber 15 and supplied to the injection openings 19. Preferably, the valve tip 19 and the valve body 5 in the region of the flow chamber 19 rounding or bevels 22, 23, which further optimize the Strömunsg . If the valve piston 6 with the axial stop 18 on the spray hole plate 14, the hydraulic medium is accelerated very strong according to the equation of continuity and thus generated at the spray openings 19 due to the very high speed a very fine spray with very small drops, the good Mixing the exhaust aftertreatment agent with exhaust gas of an internal combustion engine leads.
  • the injection device 1 has the advantage that the valve seat 8 is protected by the spray hole plate 14 from soot particles in the exhaust gas of an internal combustion engine.
  • the spray hole plate 14 also causes the
  • Valve seat 8 is not exposed to the high temperature of the exhaust gas.
  • the high pressures generated by the pressure generator 3 also cause the spray hole plate 14 can be effectively cleaned by a correspondingly adjustable pumping mode, for example, a plurality of injections with a large amount and high pressure.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Nozzles (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

L'invention concerne un dispositif d'injection (1), destiné en particulier à un système d'échappement de post-traitement de gaz d'échappement d'un moteur à combustion interne, comprenant une soupape d'injection (2), commandée en pression et s'ouvrant vers l'extérieur, qui comporte un piston de soupape (6) mobile axialement qui passe à travers un orifice de passage (7) ménagé dans un corps de soupape (5) et qui comporte à une extrémité une pointe de soupape (9), un siège de soupape (8) associé à l'orifice de passage (7) et au moins un élément à ressort (11) qui pousse le piston de soupape (6) avec la pointe de soupape (9) contre le siège de soupape (8) pour fermer l'orifice de passage (7), la pointe de soupape (9) étant mobile axialement dans une chambre d'écoulement (15) qui est formée d'une part par le corps de soupape (5) et d'autre par une plaque d'injection perforée (14) qui comporte une pluralité d'orifices d'injection (19).
EP15726097.7A 2014-06-16 2015-05-27 Dispositif d'injection Withdrawn EP3155253A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014211494.2A DE102014211494A1 (de) 2014-06-16 2014-06-16 Einspritzeinrichtung
PCT/EP2015/061690 WO2015193069A1 (fr) 2014-06-16 2015-05-27 Dispositif d'injection

Publications (1)

Publication Number Publication Date
EP3155253A1 true EP3155253A1 (fr) 2017-04-19

Family

ID=53276112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15726097.7A Withdrawn EP3155253A1 (fr) 2014-06-16 2015-05-27 Dispositif d'injection

Country Status (6)

Country Link
US (1) US10190459B2 (fr)
EP (1) EP3155253A1 (fr)
KR (1) KR20170020447A (fr)
CN (1) CN106460619A (fr)
DE (1) DE102014211494A1 (fr)
WO (1) WO2015193069A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016222908A1 (de) 2016-11-21 2018-05-24 Robert Bosch Gmbh Injektor mit dreiteiligem Ventilsitz
US10724486B2 (en) 2018-03-21 2020-07-28 Delphi Technologies Ip Limited Fluid injector having a director plate
CN113858478B (zh) * 2021-10-04 2024-03-15 山东蓝海晶体科技有限公司 一种可降解塑料加工用热熔装置

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1693931A (en) * 1926-11-30 1928-12-04 J W Clune Co Burner and valvular control therefor
US3159349A (en) 1963-01-04 1964-12-01 Curtiss Wright Corp Liquid injection system with damper means
US4313568A (en) 1980-05-27 1982-02-02 Ethyl Products Company Fluid dispenser method and apparatus
DE4221185A1 (de) 1992-06-27 1994-01-05 Bosch Gmbh Robert Spritzlochscheibe für ein Ventil und Verfahren zur Herstellung
US6626381B2 (en) 2001-11-08 2003-09-30 Bombardier Motor Corporation Of America Multi-port fuel injection nozzle and system and method incorporating same
JP3991717B2 (ja) * 2002-03-07 2007-10-17 トヨタ自動車株式会社 内燃機関の燃料供給装置
US20030201344A1 (en) * 2002-04-15 2003-10-30 Christopher Wark Nozzle assembly for injecting fuel at multiple angles
US6854670B2 (en) * 2002-05-17 2005-02-15 Keihin Corporation Fuel injection valve
JP3751264B2 (ja) * 2002-06-19 2006-03-01 株式会社ケーヒン 燃料噴射弁
US7685813B2 (en) * 2005-06-09 2010-03-30 Eaton Corporation LNT regeneration strategy over normal truck driving cycle
DE112006002122B4 (de) 2005-08-15 2016-09-22 Continental Automotive Systems, Inc. ( n. d. Ges. d. Staates Delaware ) Dieselabgas-Kohlenwasserstoff-Dosierventil für Fahrzeuge
DE102006012855A1 (de) 2006-03-21 2007-09-27 Robert Bosch Gmbh Verfahren und Dosiersystem zur Schadstoffreduktion in Kraftfahrzeugabgasen
ATE512300T1 (de) 2006-07-12 2011-06-15 Delphi Tech Holding Sarl Dosierpumpe für eines reduktionsmittels
US9683739B2 (en) * 2009-11-09 2017-06-20 Woodward, Inc. Variable-area fuel injector with improved circumferential spray uniformity
DE102012211665A1 (de) * 2011-08-18 2013-02-21 Robert Bosch Gmbh Ventil für ein strömendes Fluid
CN102748481A (zh) * 2012-07-12 2012-10-24 宁波舜田良源油嘴油泵有限公司 一种用于scr系统尿素喷射阀及其激光焊接方法

Also Published As

Publication number Publication date
CN106460619A (zh) 2017-02-22
US10190459B2 (en) 2019-01-29
DE102014211494A1 (de) 2015-12-17
KR20170020447A (ko) 2017-02-22
US20170321586A1 (en) 2017-11-09
WO2015193069A1 (fr) 2015-12-23

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