EP2871352A1 - Valve for measuring out fluid - Google Patents
Valve for measuring out fluid Download PDFInfo
- Publication number
- EP2871352A1 EP2871352A1 EP20140183692 EP14183692A EP2871352A1 EP 2871352 A1 EP2871352 A1 EP 2871352A1 EP 20140183692 EP20140183692 EP 20140183692 EP 14183692 A EP14183692 A EP 14183692A EP 2871352 A1 EP2871352 A1 EP 2871352A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- valve needle
- armature
- anchor
- ring
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 15
- 238000007885 magnetic separation Methods 0.000 claims description 8
- 239000000696 magnetic material Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 239000000446 fuel Substances 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- 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
- F02M51/0685—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 and the valve being allowed to move relatively to each other or not being attached to each other
-
- 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
-
- 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
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
Definitions
- the invention is based on a valve for metering fluid according to the preamble of claim 1, wherein the standing for a flowing or flowing medium, superordinate term fluid is used in accordance with the fluid dynamics for gases and liquids.
- a known fuel injection valve ( DE 101 08 945 A1 ) has a sleeve-shaped nozzle body which is closed by a valve seat body with an injection opening enclosed by a valve seat.
- a hollow valve needle is arranged axially displaceably, which carries a guided in the valve seat body, with the valve seat forming a sealing seat closing head.
- the valve needle is actuated by an electromagnet against the closing force of a valve closing spring acting on the valve needle.
- the electromagnet has a cup-shaped outer pole, a hollow-cylindrical inner pole and an armature which delimits a working air gap with the annular end face of the inner pole and which sits axially displaceably on the valve needle.
- the injection valve has an apparatus for generating an Ankervorhubs, which is arranged at the Schellerkopffernen end of the valve needle Mitauerflansch, on the side facing away from the driver flange side of the armature on the valve needle fixed anchor stop and a Vorhubfeder has.
- the Vorhubfeder sits inside the inner pole on an annular recess in Mitauerflansch and is supported on the one hand on Mit constitutionalflansch and on the other hand, at the anchor.
- the closing head is pressed onto the valve seat by the valve closing spring via the valve needle.
- the anchor is, acted upon by the Vorhubfeder, on the anchor stop.
- the armature Upon energization of the electromagnet, the armature is moved against the spring force of the return spring and the Vorhubfeder in the stroke direction by the magnetic spring.
- the stroke of the armature is divided into a forward stroke or armature free travel, which serves to close a Vorhubspalts, and an opening stroke. After closing the Vorhubspalts the anchor takes over the Mitauerflansch with the valve needle, and with the onset of the opening stroke lifts the closing head from the valve seat.
- the metering valve according to the invention with the features of claim 1 has the advantage that the valve can be built much shorter by the displacement of the Vorhubfeder in the region of the armature.
- a structurally conditioned short guide area of the armature on the valve needle, connected to the indirect, radial support of the valve needle via the armature, can lead to undesirable tilting of the armature on the valve needle and thus to tilting of the inner pole facing end face of the armature Working air gap limited, lead.
- This is counteracted according to the invention by the bipartite of the armature.
- the armature guide disc firmly connected to the valve needle is guided axially on the outside and limits the working air gap. For a tilting of the inner pole-side anchor surface is excluded.
- the Ankerokweg or Vorhubspalt for Ankervorhub is moved between armature guide disc and the displaceable relative to the valve needle on the valve needle anchor ring, which covers the Vorhubfeder in a longer ring section and is guided with a shorter ring portion on the valve needle.
- the leadership of the armature guide disc in the non-magnetic Tenn Scheme between the outer and inner pole prevents unwanted, direct magnetic flux between armature guide disc and outer pole.
- a plurality of angularly offset guide surfaces are formed on the circumference of the armature guide disk.
- non-magnetic guide bushing in the first ring portion of the anchor ring between the anchor ring and the valve needle fixedly connected to the anchor ring.
- the non-magnetic guide bushing in a valve needle made of a magnetic material for a magnetic separation between the valve needle and anchor ring.
- the guide bushing can be replaced by a guide collar formed integrally with the first ring section of the anchor ring and projecting beyond the inner wall of the second ring section.
- valve for metering fluid is preferred as an injection valve for injecting fuel in one
- Fuel injection system used by internal combustion engines can also be used in gas engines or in heating systems for the metered metering of fluid fuel or as a metering valve for injecting a reducing agent into the exhaust gas tract of an internal combustion engine for the purpose of reducing nitrogen oxides.
- the valve has a valve seat body 11 with a valve seat 12 enclosed by a metering opening 13, a means of a closing head 15 the metering opening 13 controlling valve needle 14, which is guided over the closing head 15 in the valve seat body 11, a valve needle 14 acting on the valve closing spring 16, the closing the metering opening 13 presses the closing head 15 onto the valve seat 12, and a solenoid valve 17 actuating the valve needle 14 against the closing or spring force of the valve closing spring 16.
- the electromagnet 17 has in a known manner an inner pole 18, an outer pole 19 with an amagnetic separation region 20 to the inner pole 18 and a seated on the valve needle 14, with the inner pole 18 a working air gap 21 of the electromagnet 17 limiting armature 22.
- a magnetic coil 26 consisting of a voltage applied to the separator ring 25 coil carrier 27 and wound on the bobbin 27 exciter winding 28, was added.
- a magnetic yoke 29 is produced from the magnet housing 23 to the magnet core 24.
- the excitation winding 28 of the magnetic coil 26 is connected via contact strips 30 with an electrical connector 31.
- a hollow cylindrical connecting piece 32 is stumped coaxially, in which a fluid inlet 33 is formed.
- the connecting piece 32, a part of the magnetic core 24 and the electrical connector 31 are integrated into a plastic casing 34, which partially overlaps the magnet housing 23 axially.
- the magnet housing 23 is provided with a stepped pot bottom, and a valve sleeve 35 connects the valve seat body 11 with the smallest in diameter portion of the pot bottom.
- the coaxial in the valve sleeve 35 extending, hollow cylindrical valve needle 14 protrudes into the hollow cylindrical magnetic core 24 and is open at the front.
- the valve needle 14 is preceded by a filter 36.
- the flowing via the fluid inlet 33 into the valve fluid enters radially into the filter 36 and axially from the filter 36 and flows through the hollow valve needle 14 and radial holes 37 of the valve needle 14 in the region of the valve sleeve 35 to the orifice 13, so that the Closing head 15 is acted upon by the pressurized fluid.
- the valve closing spring 16 is arranged in the interior of the hollow cylindrical magnetic core 24, is seated on the valve needle 14 and axially supported on the one hand on the valve needle 14 and on the other hand on the firmly pressed into the magnetic core 24 filter 36 from which at the same time an adjusting element for adjusting the closing force of the valve closing spring 16 forms.
- a device for generating an Ankervorhubs or an armature free travel comprises a fixed to the valve needle 14 anchor stopper 38 and an armature 22 in the direction of anchor stop 38 acting on Vorhubfeder 39, which is arranged to shorten the axial length of the valve within the armature 22 on the valve needle 14.
- the in FIG. 2 in enlarged sectional view and in FIG. 3 In an enlarged lower view to be seen anchor 22 axially divided into an armature guide disc 221 and an anchor ring 222.
- the armature guide disc 221 is fixedly connected to the valve needle 14 and limited with its inner pole side annular surface the working air gap 21 of the electromagnet 17.
- the armature guide disc 221 is axially displaceable in the non-magnetic separation region 20 of the outer pole 19, ie in the separator ring 25, and has this on the outer circumference a plurality of angular offset Guide surfaces 221 a on ( FIG. 3 ).
- the armature ring 222 is seated axially displaceable on the valve needle 14 between the armature guide disc 221 and armature stop 38.
- the Ankerokke or -vorhub 41 forming displacement on the valve needle 14 is limited on the one hand by the armature stopper 38 and on the other hand by the armature guide disc 221.
- the armature ring 222 is positioned so that a radial magnetic flux between the outer pole 19 and the magnet housing 23 and the anchor ring 222 is ensured.
- the outer diameter of the anchor ring 222 is selected so that its Displacement of a mechanical contact with the outer pole 19 or magnet housing 23 is excluded.
- the anchor ring 222 has an axially shorter first ring portion 222a with a smaller inner diameter and an axially longer second ring portion 222b with a larger inner diameter.
- a one-piece guide collar radially projecting beyond the inner wall of the second annular section 222b is present on the first annular section 222a.
- This in FIG. 2 for a later described modification of the armature 22 shown and designated 40 component represents in this context this guide collar, which in the rest in FIG. 1 can be seen as an integral part of the anchor ring 22.
- the second ring portion 222b encloses due to its larger inner diameter which sits on the valve needle 14 Vorhubfeder 39 with a radial distance.
- the Vorhubfeder 39 is supported on the one hand on the armature guide plate 221, and thus on the valve needle 14, and on the other hand on the anchor ring 222, wherein the ankerring workede support on the guide collar, on its annular end face made.
- the valve needle 14 is preferably non-magnetic, so it consists of a magnetically not or only poorly conductive material. If the valve needle 14 is magnetic, that is, if it consists of a magnetically highly conductive material, a needle section is formed in the valve needle 14 in an amagnetic manner, which extends over the first ring section 222a. This non-magnetic needle section provides a magnetic separation between anchor ring 222 and valve needle 14.
- the magnetic separation of valve needle 14 and armature 22 can be laid in the anchor ring 222.
- the seated on the valve needle 14 guide collar of the first ring portion 222a has a large magnetic resistance.
- the guide collar is replaced by a separate guide bush 40 made of a magnetically non or poorly conductive material, which is firmly connected to the anchor ring 222.
- the inner diameter of the first ring portion 222a is the same the inner diameter of the second ring portion 222 b made and the guide sleeve 40 between the first ring portion 222 a and the valve needle 14 is arranged.
- the guide sleeve 40 assumes the leadership of the anchor ring 222 on the valve needle 14 and with its annular end face the ankerring workede support the Vorhubfeder 39th
- the armature guide plate 221 remains in the position described by the pressure force of the valve closing spring 16.
- the armature ring 222 is accelerated by the magnetic force in the direction of armature guide plate 221.
- Anchor ring 222, armature guide disc 221 and valve needle 14 move together until the armature guide disc 221 reaches the inner pole 18 or magnetic core 24. The valve is fully open.
- valve closing spring 16 pushes the valve needle 14 back with armature 22 until the closing head 15 presses on the valve seat 12 and the metering opening 13 closes.
- the Vorhubfeder 39 presses the anchor ring 222 against the anchor stop 38 and is between the anchor ring 222 and armature guide plate 221, the gap for the Ankerokweg or -vorhub 41 again.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
Es wird ein Ventil zum Zumessen von Fluid angegeben, das eine Ventilnadel (14) mit einem in einem Ventilsitzkörper (11) geführten Schließkopf (15) und einen auf der Ventilnadel (14) axial verschieblichen Anker (22) eines Elektromagneten (17) mit Innen- und Außenpol (18, 19) zum Betätigen der Ventilnadel (14) sowie eine Vorrichtung zum Erzeugen eines Ankervorhubs mit einem an der Ventilnadel (14) fest angeordneten Ankeranschlag (38) und einer den Anker (22) in Richtung Ankeranschlag (38) beaufschlagenden Vorhubfeder (39) aufweist. Zur Erzielung einer kurzen Baulänge des Ventils und einer verkippungsfreien Führung des Ankers (22) auf der Ventilnadel (14) ist der Anker (22) in eine mit der Ventilnadel (14) fest verbundene, in einem amagnetischen Trennbereich (20) zwischen Innen- und Außenpol (18, 19) axial geführte Ankerführungsscheibe (221) und einen zwischen Ankerführungsscheibe (221) und Ankeranschlag (38) angeordneten, auf der Ventilnadel (14) frei beweglichen Ankerring (222) unterteilt. Der Ankerring (222) weist einen ersten und zweiten Ringabschnitt (222a, 222b) auf. Mit dem ersten Ringabschnitt (222a) ist der Ankerring (22) auf der Ventilnadel (14) axial verschieblich geführt, und im zweiten Ringabschnitt (222b) ist die auf der Ventilnadel (14) sitzende Vorhubfeder (39) angeordnet, die sich an Ankerring (222) und Ankerführungsscheibe (221) axial abstützt.The invention relates to a valve for metering fluid, comprising a valve needle (14) with a closing head (15) guided in a valve seat body (11) and an armature (22) of an electromagnet (17) axially displaceable on the valve needle (14) - And outer pole (18, 19) for actuating the valve needle (14) and a device for generating an Ankervorhubs with an on the valve needle (14) fixedly arranged anchor stop (38) and the armature (22) in the direction of anchor stop (38) acted upon Vorhubfeder (39). To achieve a short overall length of the valve and a tilt-free guidance of the armature (22) on the valve needle (14) of the armature (22) in one with the valve needle (14) fixed, in an amagnetic separation region (20) between the inside and Pole (18, 19) axially guided armature guide disc (221) and a between armature guide disc (221) and anchor stop (38) arranged on the valve needle (14) freely movable anchor ring (222) divided. The anchor ring (222) has first and second ring portions (222a, 222b). With the first ring portion (222 a) of the anchor ring (22) on the valve needle (14) is guided axially displaceable, and in the second ring portion (222 b) sitting on the valve needle (14) Vorhubfeder (39) is arranged, which at anchor ring ( 222) and armature guide disc (221) axially supported.
Description
Die Erfindung geht aus von einem Ventil zum Zumessen von Fluid nach dem Oberbegriff des Anspruchs 1, wobei der für ein strömendes oder fließendes Medium stehende, übergeordnet Begriff Fluid in Übereinstimmung mit der Strömungslehre für Gase und Flüssigkeiten verwendet wird.The invention is based on a valve for metering fluid according to the preamble of claim 1, wherein the standing for a flowing or flowing medium, superordinate term fluid is used in accordance with the fluid dynamics for gases and liquids.
Ein bekanntes Brennstoffeinspritzventil (
Das erfindungsgemäße Zumessventil mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass durch die Verlagerung der Vorhubfeder in den Bereich des Ankers das Ventil deutlich kürzer gebaut werden kann. Ein dadurch konstruktiv bedingter kurzer Führungsbereich des Ankers auf der Ventilnadel, verbunden mit der indirekten, radialen Abstützung der Ventilnadel über den Anker, kann zu einem unerwünschten Verkippen des Ankers auf der Ventilnadel und damit zu einem Verkippen der dem Innenpol zugekehrten Stirnfläche des Ankers, die den Arbeitsluftspalt begrenzt, führen. Dem wird erfindungsgemäß durch die Zweiteiligkeit des Ankers begegnet. Die fest mit der Ventilnadel verbundene Ankerführungsscheibe ist außen axial geführt und begrenzt den Arbeitsluftspalt. Damit ist ein Verkippen der innenpolseitigen Ankerfläche ausgeschlossen. Der Ankerfreiweg oder Vorhubspalt für den Ankervorhub ist zwischen Ankerführungsscheibe und dem relativ zur Ventilnadel auf der Ventilnadel verschiebbaren Ankerring verlegt, der in einem längeren Ringabschnitt die Vorhubfeder überdeckt und mit einem kürzeren Ringabschnitt auf der Ventilnadel geführt ist. Die Führung der Ankerführungsscheibe im amagnetischen Tennbereich zwischen Außen- und Innenpol verhindert einen unerwünschten, direkten Magnetfluss zwischen Ankerführungsscheibe und Außenpol.The metering valve according to the invention with the features of claim 1 has the advantage that the valve can be built much shorter by the displacement of the Vorhubfeder in the region of the armature. A structurally conditioned short guide area of the armature on the valve needle, connected to the indirect, radial support of the valve needle via the armature, can lead to undesirable tilting of the armature on the valve needle and thus to tilting of the inner pole facing end face of the armature Working air gap limited, lead. This is counteracted according to the invention by the bipartite of the armature. The armature guide disc firmly connected to the valve needle is guided axially on the outside and limits the working air gap. For a tilting of the inner pole-side anchor surface is excluded. The Ankerfreiweg or Vorhubspalt for Ankervorhub is moved between armature guide disc and the displaceable relative to the valve needle on the valve needle anchor ring, which covers the Vorhubfeder in a longer ring section and is guided with a shorter ring portion on the valve needle. The leadership of the armature guide disc in the non-magnetic Tennbereich between the outer and inner pole prevents unwanted, direct magnetic flux between armature guide disc and outer pole.
Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Ventils möglich.The measures listed in the further claims advantageous refinements and improvements of the claim 1 valve are possible.
Gemäß einer vorteilhaften Ausführungsform der Erfindung sind am Umfang der Ankerführungsscheibe mehrere, winkelversetzte Führungsflächen ausgebildet. Dadurch wird eine radiale Rundumabstützung der Ankerführungsscheibe - und damit der Ventilnadel - mit nur minimalen Reibungsverlusten beim Ankerhub geschaffen.According to an advantageous embodiment of the invention, a plurality of angularly offset guide surfaces are formed on the circumference of the armature guide disk. As a result, a radial all-round support of the armature guide disk - and thus of the valve needle - is created with only minimal friction losses during the armature stroke.
Gemäß einer vorteilhaften Ausführungsform der Erfindung ist in dem ersten Ringabschnitt des Ankerrings zwischen dem Ankerring und der Ventilnadel eine mit dem Ankerring fest verbundene, amagnetische Führungsbuchse angeordnet. Die amagnetische Führungsbuchse sorgt bei einer Ventilnadel aus einem magnetischen Werkstoff für eine magnetische Trennung zwischen Ventilnadel und Ankerring.According to an advantageous embodiment of the invention, in the first ring portion of the anchor ring between the anchor ring and the valve needle fixedly connected to the anchor ring, non-magnetic guide bushing is arranged. The non-magnetic guide bushing in a valve needle made of a magnetic material for a magnetic separation between the valve needle and anchor ring.
Der gleiche Effekt wird gemäß einer alternativen Ausführungsform der Erfindung durch einen über den ersten Ringabschnitt des Ankerrings sich erstreckenden, amagnetischen Bereich der ansonsten magnetischen Ventilnadel erzielt. In diesem Fall kann die Führungsbuchse durch einen mit dem ersten Ringabschnitt des Ankerrings einstückig ausgebildeten, über die Innenwand des zweiten Ringabschnitts überstehenden Führungsbund ersetzt werden.The same effect is achieved according to an alternative embodiment of the invention by an over the first ring portion of the anchor ring extending, nonmagnetic region of the otherwise magnetic valve needle. In this case, the guide bushing can be replaced by a guide collar formed integrally with the first ring section of the anchor ring and projecting beyond the inner wall of the second ring section.
Die Erfindung ist anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels in der nachfolgenden Beschreibung näher erläutert. Es zeigen:
-
Figur 1 einen Längsschnitt eines Ventils zum Zumessen von Fluid mit einem Elektromagneten zur Ventilsteuerung, -
Figur 2 eine vergrößerte Darstellung des Ausschnitts II inFigur 1 mit einer Modifikation des Ankers des Elektromagneten, -
Figur 3 eine Unteransicht des Ankers in Richtung Pfeil III inFigur 2 .
-
FIG. 1 a longitudinal section of a valve for metering fluid with a solenoid for valve control, -
FIG. 2 an enlarged view of the section II inFIG. 1 with a modification of the armature of the electromagnet, -
FIG. 3 a bottom view of the armature in the direction of arrow III inFIG. 2 ,
Das in
Kraftstoffeinspritzanlage von Brennkraftmaschinen eingesetzt. Es kann jedoch auch in Gasmotoren oder in Heizungsanlagen zum dosierten Zumessen von fluidem Brennstoff oder als Dosierventil zum Einspritzen eines Reduktionsmittels in den Abgastrakt einer Brennkraftmaschine zwecks Reduzierung von Stickoxiden Verwendung finden.Fuel injection system used by internal combustion engines. However, it can also be used in gas engines or in heating systems for the metered metering of fluid fuel or as a metering valve for injecting a reducing agent into the exhaust gas tract of an internal combustion engine for the purpose of reducing nitrogen oxides.
Das Ventil weist einen Ventilsitzkörper 11 mit einer von einem Ventilsitz 12 umschlossenen Zumessöffnung 13, eine mittels eines Schließkopfs 15 die Zumessöffnung 13 steuernde Ventilnadel 14, die über den Schließkopf 15 im Ventilsitzkörper 11 geführt ist, eine die Ventilnadel 14 beaufschlagende Ventilschließfeder 16, die zum Schließen der Zumessöffnung 13 den Schließkopf 15 auf dem Ventilsitz 12 aufpresst, und einen die Ventilnadel 14 gegen die Schließ- oder Federkraft der Ventilschließfeder 16 betätigenden Elektromagneten 17 auf. Der Elektromagnet 17 besitzt in bekannter Weise einen Innenpol 18, einen Außenpol 19 mit einem amagnetischen Trennbereich 20 zum Innenpol 18 und einen auf der Ventilnadel 14 sitzenden, mit dem Innenpol 18 einen Arbeitsluftspalt 21 des Elektromagneten 17 begrenzenden Anker 22. Im dargestellten Ausführungsbeispiel ist der Außenpol 19 von einem topfförmigen Magnetgehäuse 23, der Innenpol 18 von einen hohlzylindrischen Magnetkern 24 und der amagnetische Trennbereich 20 von einem separaten Trennring 25 gebildet, der stirnseitig am Topfboden des Magnetgehäuses 23 anliegt und den hohlzylindrischen Magnetkern 24 axial übergreift. Im Magnetgehäuse 23 ist eine Magnetspule 26, bestehend aus einem am Trennring 25 anliegenden Spulenträger 27 und einer auf dem Spulenträger 27 aufgewickelten Erregerwicklung 28, aufgenommen. Oberhalb der Topföffnung des Magnetgehäuses 23 ist ein magnetischer Rückschluss 29 vom Magnetgehäuse 23 zum Magnetkern 24 hergestellt. Die Erregerwicklung 28 der Magnetspule 26 ist über Kontaktstreifen 30 mit einem elektrischen Anschlussstecker 31 verbunden. Auf den hohlzylindrischen Magnetkern 24 ist stumpf ein hohlzylindrisches Anschlussstück 32 koaxial aufgesetzt, in dem ein Fluidzulauf 33 ausgebildet ist. Das Anschlussstück 32, ein Teil des Magnetkerns 24 und der elektrische Anschlussstecker 31 sind in eine Kunststoffummantelung 34 eingebunden, die das Magnetgehäuse 23 teilweise axial übergreift. Das Magnetgehäuse 23 ist mit einem gestuften Topfboden versehen, und eine Ventilhülse 35 verbindet den Ventilsitzkörper 11 mit dem im Durchmesser kleinsten Abschnitt des Topfbodens. Die in der Ventilhülse 35 sich koaxial erstreckende, hohlzylindrische Ventilnadel 14 ragt in den hohlzylindrischen Magnetkern 24 hinein und ist stirnseitig offen. Im Magnetkern 24 ist der Ventilnadel 14 ein Filter 36 vorgeordnet. Das über den Fluidzulauf 33 in das Ventil einströmende Fluid tritt radial in den Filter 36 ein und axial aus dem Filter 36 aus und strömt durch die hohle Ventilnadel 14 und über Radialbohrungen 37 der Ventilnadel 14 im Bereich der Ventilhülse 35 zur Zumessöffnung 13, so dass der Schließkopf 15 von dem unter Druck stehenden Fluid beaufschlagt ist. Die Ventilschließfeder 16 ist im Innern des hohlzylindrischen Magnetkerns 24 angeordnet, sitzt auf der Ventilnadel 14 und stützt sich axial einerseits an der Ventilnadel 14 und andererseits an dem fest in den Magnetkern 24 eingepressten Filter 36 ab, der zugleich ein Justierelement zur Einstellung der Schließkraft der Ventilschließfeder 16 bildet.The valve has a
Zur Verbesserung der Öffnungsdynamik des Ventils ist eine Vorrichtung zum Erzeugen eines Ankervorhubs oder eines Ankerfreiwegs vorgesehen. Die Vorrichtung umfasst einen an der Ventilnadel 14 fest angeordneten Ankeranschlag 38 und eine den Anker 22 in Richtung Ankeranschlag 38 beaufschlagende Vorhubfeder 39, die zur Verkürzung der axialen Baulänge des Ventils innerhalb des Ankers 22 auf der Ventilnadel 14 angeordnet ist. Um wegen der dadurch verkürzten axialen Führung des Ankers 22 auf der Ventilnadel 14 der Gefahr eines Verkippens des Ankers 22 auf der Ventilnadel 14 zu begegnen, ist der in
Die Ventilnadel 14 ist vorzugsweise amagnetisch, besteht also aus einem magnetisch nicht oder nur schlecht leitenden Werkstoff. Ist die Ventilnadel 14 magnetisch, besteht also aus einem magnetisch gut leitenden Werkstoff, so ist in der Ventilnadel 14 ein Nadelabschnitt amagnetisch ausgebildet, der sich über den ersten Ringabschnitt 222a erstreckt. Dieser amagnetische Nadelabschnitt sorgt für eine magnetische Trennung zwischen Ankerring 222 und Ventilnadel 14.The
Alternativ kann bei einer Ventilnadel 14 aus magnetischem Werkstoff die magnetische Trennung von Ventilnadel 14 und Anker 22 in den Ankerring 222 verlegt werden. Hierzu weist der auf der Ventilnadel 14 sitzende Führungsbund des ersten Ringabschnitts 222a einen großen magnetischen Widerstand auf. Dies ist in einer in
Im unbestromten Zustand des Elektromagneten 17 ist der Schließkopf 15 von der die Ventilnadel 14 über die mit der Ventilnadel 14 fest verbundene Ankerführungsscheibe 221 beaufschlagenden Ventilschließfeder 16 auf den Ventilsitz 12 aufgedrückt und somit die Zumessöffnung 13 verschlossen. Zwischen der Ankerführungsscheibe 221 und dem Innenpol 18 bzw. dem Magnetkern 24 besteht der Arbeitsluftspalt 21des Elektromagneten 17. Der Ankerring 222 ist durch die Vorhubfeder 39 an den Ankeranschlag 38 angelegt, wobei sich zwischen der Ankerführungsscheibe 221 und dem Ankerring 22 ein dem Ankerfreiweg oder -vorhub 41 darstellender axialer Spalt einstellt.In the de-energized state of the
Wird der Elektromagnet 17 bestromt, so bleibt die Ankerführungsscheibe 221 durch die Druckkraft der Ventilschließfeder 16 in der beschriebenen Position. Der Ankerring 222 wird durch die Magnetkraft in Richtung Ankerführungsscheibe 221 beschleunigt. Erreicht der Ankerring 222 die Ankerführungsscheibe 221, überträgt er seinen mechanischen Impuls auf die Ankerführungsscheibe 221 und damit auf die Ventilnadel 14, so dass der Schließkopf 15 beginnt, von dem Ventilsitz 12 abzuheben. Ankerring 222, Ankerführungsscheibe 221 und Ventilnadel 14 bewegen sich gemeinsam, bis die Ankerführungsscheibe 221 den Innenpol 18 bzw. Magnetkern 24 erreicht. Das Ventil ist voll geöffnet. Bei Wegfall der Bestromung der Magnetspule 26 schiebt die Ventilschließfeder 16 die Ventilnadel 14 mit Anker 22 zurück, bis der Schließkopf 15 sich auf den Ventilsitz 12 aufpresst und die Zumessöffnung 13 verschließt. Die Vorhubfeder 39 drückt den Ankerring 222 gegen den Ankeranschlag 38 und stellt zwischen Ankerring 222 und Ankerführungsscheibe 221 den Spalt für den Ankerfreiweg oder -vorhub 41 wieder ein.If the
Claims (9)
Applications Claiming Priority (1)
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DE102013222590.3A DE102013222590A1 (en) | 2013-11-07 | 2013-11-07 | Valve for metering fluid |
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EP2871352A1 true EP2871352A1 (en) | 2015-05-13 |
EP2871352B1 EP2871352B1 (en) | 2017-08-02 |
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EP14183692.4A Not-in-force EP2871352B1 (en) | 2013-11-07 | 2014-09-05 | Valve for measuring out fluid |
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DE (1) | DE102013222590A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114198509A (en) * | 2021-11-19 | 2022-03-18 | 宜兴利合机械科技有限公司 | Electric control valve capable of being switched on and off rapidly |
CN117262297A (en) * | 2023-11-22 | 2023-12-22 | 山东东源新材料科技有限公司 | Split charging device and split charging method for desulfurization and denitrification catalyst |
WO2024115328A1 (en) * | 2022-11-28 | 2024-06-06 | Liebherr-Components Deggendorf Gmbh | Injector for injecting fuel |
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WO2001057392A1 (en) * | 2000-02-04 | 2001-08-09 | Robert Bosch Gmbh | Fuel injection valve and method for operating the same |
DE10108945A1 (en) | 2001-02-24 | 2002-09-05 | Bosch Gmbh Robert | Fuel injector |
EP1801409A1 (en) * | 2005-12-23 | 2007-06-27 | Delphi Technologies, Inc. | Fuel injector |
EP2236807A1 (en) * | 2009-03-23 | 2010-10-06 | Continental Automotive GmbH | Fluid injector |
JP2011208603A (en) * | 2010-03-30 | 2011-10-20 | Denso Corp | Fuel injection valve |
EP2444651A1 (en) * | 2010-10-19 | 2012-04-25 | Continental Automotive GmbH | Valve assembly for an injection valve and injection valve |
-
2013
- 2013-11-07 DE DE102013222590.3A patent/DE102013222590A1/en not_active Withdrawn
-
2014
- 2014-09-05 EP EP14183692.4A patent/EP2871352B1/en not_active Not-in-force
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001057392A1 (en) * | 2000-02-04 | 2001-08-09 | Robert Bosch Gmbh | Fuel injection valve and method for operating the same |
DE10108945A1 (en) | 2001-02-24 | 2002-09-05 | Bosch Gmbh Robert | Fuel injector |
EP1801409A1 (en) * | 2005-12-23 | 2007-06-27 | Delphi Technologies, Inc. | Fuel injector |
EP2236807A1 (en) * | 2009-03-23 | 2010-10-06 | Continental Automotive GmbH | Fluid injector |
JP2011208603A (en) * | 2010-03-30 | 2011-10-20 | Denso Corp | Fuel injection valve |
EP2444651A1 (en) * | 2010-10-19 | 2012-04-25 | Continental Automotive GmbH | Valve assembly for an injection valve and injection valve |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114198509A (en) * | 2021-11-19 | 2022-03-18 | 宜兴利合机械科技有限公司 | Electric control valve capable of being switched on and off rapidly |
WO2024115328A1 (en) * | 2022-11-28 | 2024-06-06 | Liebherr-Components Deggendorf Gmbh | Injector for injecting fuel |
CN117262297A (en) * | 2023-11-22 | 2023-12-22 | 山东东源新材料科技有限公司 | Split charging device and split charging method for desulfurization and denitrification catalyst |
CN117262297B (en) * | 2023-11-22 | 2024-01-30 | 山东东源新材料科技有限公司 | Split charging device and split charging method for desulfurization and denitrification catalyst |
Also Published As
Publication number | Publication date |
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EP2871352B1 (en) | 2017-08-02 |
DE102013222590A1 (en) | 2015-05-21 |
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