EP2823176B1 - Valve for metering a fluid - Google Patents

Valve for metering a fluid Download PDF

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Publication number
EP2823176B1
EP2823176B1 EP13702796.7A EP13702796A EP2823176B1 EP 2823176 B1 EP2823176 B1 EP 2823176B1 EP 13702796 A EP13702796 A EP 13702796A EP 2823176 B1 EP2823176 B1 EP 2823176B1
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EP
European Patent Office
Prior art keywords
channel
valve
flow channel
ring
flow
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.)
Not-in-force
Application number
EP13702796.7A
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German (de)
French (fr)
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EP2823176A1 (en
Inventor
Michael Mayer
Pablo Antonio NAPAL JIMENEZ
Michael Fischer
Andrej Elsinger
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2823176A1 publication Critical patent/EP2823176A1/en
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Publication of EP2823176B1 publication Critical patent/EP2823176B1/en
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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
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive 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
    • 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
    • F02M61/08—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 the valves opening in direction of fuel flow
    • 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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations

Definitions

  • the invention is based on a valve for metering a fluid, in particular for injecting fuel in a fuel injection system of internal combustion engines, according to the preamble of claim 1.
  • a known valve for metering a fluid ( DE 10 2009 026 532 A1 ) has an inlet for the fluid accommodated in a connection piece, an inlet opening formed in a valve body for metering a metered quantity of fluid by means of a valve needle closing and releasing the metering opening and controlled by a piezoelectric actuator and a valve closing spring, and an elongate, leading from the inlet to the metering opening hollow cylindrical flow channel on.
  • Connecting piece and valve body are fixed in a valve housing and close this in each case at one end of the housing fluid-tight. Coaxially with the valve housing, an elongate sleeve extends between the connection piece and the valve body.
  • the sleeve is fastened to the connection piece and the valve body with its two sleeve ends and accommodates a valve assembly consisting of the piezoelectric actuator and a hydraulic coupler.
  • the annular gap remaining between the sleeve and the valve housing constitutes the hollow-cylindrical flow channel for the fluid, so that the inner channel wall of the flow channel is formed by the sleeve and the outer channel wall of the flow channel by the valve housing.
  • a valve chamber which is connected via an introduced into the valve body radial inlet bore with the flow channel, while in the connecting piece, a connection is made from the flow channel to the inlet.
  • Out DE102010030383 is a valve for metering a fluid, in particular for injecting fuel in a fuel injection system of internal combustion engines, known.
  • the flow channel is limited by a built-in valve guide body with a base disk and a bore-like fluid passage in its flow. In this way, the total flow channel is subdivided into at least two mutually separate channel sections, whereby a throttled flow connection exists between the passage sections following one another in the flow direction in the region of the fluid passage.
  • the valve according to the invention with the features of claim 1 has the advantage that the design-related hydraulic resonances can be influenced by the subdivision of the flow channel into a plurality of mutually separated channel sections and the establishment of a flow connection between the successive channel sections in the flow direction, that an excitation critical, built-in Strukurmoden no longer takes place, so hydraulic resonances in the critical frequency range of typically 3 kHz can no longer arise.
  • the subdivision of the flow channel into two channel sections, and thus the division of the fluid volume into two sub-volumes takes place at half the length of the flow channel.
  • other division ratios and also several subdivisions of the flow channel with different division ratios are possible.
  • the subdivision of the flow channel and the production of the flow connection between the channel sections is realized in that at least one channel location in the flow channel, a ring with an annular gap and one of the radial channel width corresponding ring thickness or ring thickness or radial annular wall dimension is inserted into the flow channel ,
  • a ring advantageously has one rectangular or circular cross section and is made of a band or wire with a rectangular or circular cross-section.
  • the ring is fixed in the flow channel, which is preferably done by positive immersion of the ring in at least one annular groove which is incorporated in the inner and / or outer channel wall of the flow channel.
  • two rings are arranged one behind the other at a short distance at least one channel location in the flow channel.
  • the rings are aligned so that their annular gaps are rotated against each other in the circumferential direction, preferably by 180 °.
  • This constructive arrangement of the rings has the advantage that between two successive channel sections, an intermediate volume of the fluid is generated.
  • the subdivision of the flow channel and the flow connection between the generated channel sections is realized in that at least one point in the flow channel, a cross-sectional constriction is made.
  • This cross-sectional constriction is advantageously achieved by protruding from at least one of the two channel walls of the flow channel a circumferential on the channel wall nose into the flow channel, which is preferably made by a recess incorporated in the channel wall.
  • Such a circumferential constriction of the flow cross section of the flow channel has the advantage that, depending on the fluid pressure, the cross section of the constriction changes, namely increases with increasing pressure.
  • valve for metering a fluid is preferably used as an injection valve for injecting fuel in a fuel injection system of internal combustion engines, wherein preferably the fuel is injected into the combustion cylinder of the internal combustion engine.
  • the valve has an inlet 11 for the fluid, an orifice 12 for the fluid, and an elongated, hollow cylindrical flow channel 13 leading from the inlet 11 to the orifice 12.
  • the flow channel 13 has an outer channel wall 13 a, which is formed by a tubular valve housing 14, and an inner channel wall 13 b, which is formed by a valve housing 14 concentrically arranged sleeve 15.
  • the valve housing 14 is closed fluid-tight at one end face of a connector 16 and at its other end of a valve body.
  • the connecting piece 16 contains the inlet 11 while in the valve body 17, the metering opening 12 is formed.
  • the sleeve 15 is fixed in a fluid-tight manner with its one sleeve end to the connecting piece 16 and with its other sleeve end to the valve body 17.
  • a valve assembly is integrated, which consists of a kardanisch on the connector 16 mounted hydraulic coupler 18, a connected to the coupler 18 piezoelectric or magnetostrictive actuator 19 and a valve body 17 is supported valve closing spring 20.
  • Actuator 19 and valve closing spring 20 engage with opposite directions of action on a valve needle 21 which is guided axially displaceably in the valve body 17 and the metering opening 12 controls with a closing head 22 which cooperates with a valve seat 23 surrounding the metering orifice 12.
  • the actuator 19 is connected via a contact bridge 24 with an electrical connector 25 and lifts when energized the closing head 22 of the valve needle 21 against the restoring force of the valve closing spring 20 from the valve seat 23 to the outside.
  • the valve-closing spring 20 which is tensioned when the orifice 12 is opened via the valve needle 21, pushes the closing head 22 back onto the valve seat 23, so that the orifice 12 is closed.
  • the connection of the flow channel 13 and the metering opening 12 is produced within the valve body 17 by a valve chamber 26 upstream of the metering opening 12 and a radial bore 27 leading from the flow channel 13 to the valve chamber 26, while the flow channel 13 is connected to the inlet 11 through a connecting bore 33 introduced into the connector 16 connected.
  • the flow channel 13 with an annular flow cross section is subdivided into at least two mutually separated channel sections 131, 132 and a flow connection between the channel sections 131, 132 the fluid is made.
  • the subdivision of the flow channel 13 in the divider ratio is 1: 1. But according to a desired frequency shift can also others Division ratios and the subdivision of the flow channel 13 may be required in more than two channel sections.
  • the subdivision of the flow channel 13 into two or more channel sections and the establishment of the flow connection between the channel sections can be realized at one or more channel locations in various ways.
  • cutout A of the flow channel 13 is at a channel location in the flow channel 13, a cross-sectional constriction of the annular cross section of the flow channel 13 made.
  • outer channel wall 13a an annular recess 28 is impressed, which results in a projecting into the flow channel 13, on the channel wall 13a circumferential nose 29.
  • the same lug 29 may alternatively be present on the inner channel wall 13b formed by the sleeve 15.
  • the arrangement of a respective nose 29 on the inner channel wall 13b and on the outer channel wall 13a is possible, wherein the lugs 29 are opposite to each other or may be offset from each other at a short distance.
  • the width of the nose 29 seen in the axial direction can be adjusted according to the degree of desired throttling. Typical widths are 1 -10 mm. The remaining in the radial direction width of the flow channel 13 at the channel location (gap width) can also be adjusted according to the desired degree of throttling or narrower. Typical gap widths are 0.01 - 0.1 mm.
  • FIGS. 3 to 8 three further embodiments are shown, as at a channel location of the flow channel 13, a division into two consecutive channel sections 131 and 132 is achieved with a flow connection between the channel sections 131 and 132.
  • rings 30 are used with an annular gap 31 and a radial channel width of the flow channel 13 corresponding ring thickness or ring thickness or radial annular wall dimension, which are inserted into the flow channel 13.
  • a ring 30 a In the two embodiments according to FIGS. 3 to 6 is located at the channel location of the flow channel 13, a ring 30 a.
  • the ring 30 is in Flow channel 13 fixed to at least one channel wall, wherein the fixation is effected in that the ring 30 partially inserted into at least one of the channel walls 13a, 13b incorporated annular groove 32 positively.
  • the ring 30 has a rectangular cross section and the annular groove 32 is incorporated into the inner channel wall 13b.
  • the ring 30 is made of a band.
  • the ring 30 has a circular cross-section and the annular groove 32 is formed by an annular bead embossed into the outer channel wall 13a from the inside of the outer channel wall 13a.
  • the ring 30 is made of a wire.
  • each ring 30 has a circular cross-section and partially immersed in an annular groove 32, each formed by an annular bead which is embossed in the outer channel wall 13a from the inside thereof.
  • FIG. 8 shows, while the rings 30 are aligned so that their annular gaps 31 are rotated against each other. Preference is given to a rotation of the annular gap by 180 °.
  • the arrangement of two slightly spaced rings 30 has the advantage that an intermediate volume of the fluid is created between two consecutive channel sections. The same effect is achieved by the above-mentioned arrangement of two lugs 29 on the outer and inner channel wall 13a 13b, which are offset from each other at a short distance.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Valves (AREA)
  • Lift Valve (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Ventil zum Zumessen eines Fluids, insbesondere zum Einspritzen von Kraftstoff in einer Kraftstoffeinspritzanlage von Brennkraftmaschinen, nach dem Oberbegriff des Anspruchs 1.The invention is based on a valve for metering a fluid, in particular for injecting fuel in a fuel injection system of internal combustion engines, according to the preamble of claim 1.

Ein bekanntes Ventil zum Zumessen eines Fluids ( DE 10 2009 026 532 A1 ) weist einen in einem Anschlussstück aufgenommenen Zulauf für das Fluid, eine in einem Ventilkörper ausgebildete Zumessöffnung zum Zumessen einer dosierten Fluidmenge mittels einer die Zumessöffnung schließenden und freigebenden, von einem piezoelektrischen Aktor und einer Ventilschließfeder gesteuerten Ventilnadel und einen vom Zulauf zur Zumessöffnung führenden, langgestreckten, hohlzylindrischen Strömungskanal auf. Anschlussstück und Ventilkörper sind in einem Ventilgehäuse festgelegt und schließen dieses jeweils an einem Gehäuseende fluiddicht ab. Zwischen dem Anschlussstück und dem Ventilkörper erstreckt sich koaxial zum Ventilgehäuse eine langgestreckte Hülse, die mit ihren beiden Hülsenenden auf Anschlussstück und Ventilkörper festgelegt ist und eine Ventilbaugruppe, bestehend aus dem piezoelektrischen Aktor und einem hydraulischen Koppler, aufnimmt. Der zwischen Hülse und Ventilgehäuse verbleibende Ringsspalt stellt den hohlzylindrischen Strömungskanal für das Fluid dar, so dass die innere Kanalwand des Strömungskanals von der Hülse und die äußere Kanalwand des Strömungskanals von dem Ventilgehäuse gebildet ist. Im Ventilkörper ist der Zumessöffnung eine Ventilkammer vorgelagert, die über eine in den Ventilkörper eingebrachte radiale Zulaufbohrung mit dem Strömungskanal verbunden ist, während im Anschlussstück eine Verbindung vom Strömungskanal zum Zulauf hergestellt ist.A known valve for metering a fluid ( DE 10 2009 026 532 A1 ) has an inlet for the fluid accommodated in a connection piece, an inlet opening formed in a valve body for metering a metered quantity of fluid by means of a valve needle closing and releasing the metering opening and controlled by a piezoelectric actuator and a valve closing spring, and an elongate, leading from the inlet to the metering opening hollow cylindrical flow channel on. Connecting piece and valve body are fixed in a valve housing and close this in each case at one end of the housing fluid-tight. Coaxially with the valve housing, an elongate sleeve extends between the connection piece and the valve body. The sleeve is fastened to the connection piece and the valve body with its two sleeve ends and accommodates a valve assembly consisting of the piezoelectric actuator and a hydraulic coupler. The annular gap remaining between the sleeve and the valve housing constitutes the hollow-cylindrical flow channel for the fluid, so that the inner channel wall of the flow channel is formed by the sleeve and the outer channel wall of the flow channel by the valve housing. In the valve body of the metering orifice is preceded by a valve chamber which is connected via an introduced into the valve body radial inlet bore with the flow channel, while in the connecting piece, a connection is made from the flow channel to the inlet.

Es hat sich gezeigt, dass beim Zumessen des üblicherweise unter hohem Druck stehenden Fluids, also beim Öffnen und Schließen des Ventils, Druckstöße entstehen, die Hydraulikschwingungen erzeugen, die ihrerseits die Anbaustruktur am Ventil zu Schwingungen anregen, was zu auffälligen, unerwünschten Geräuschen führt. Die durch den langgestreckten, hohlzylindrischen Strömungskanal vorgegebene Form des Fluidvolumens führt dabei zu ausgeprägten Hydraulikresonanzen über die gesamte Länge des Ventils, die besonders gut an einbaubedingte, strukurelle Längsresonanzen des Ventils von typischerweise 3 kHz ankoppeln.It has been found that the metering of the usually high-pressure fluid, so when opening and closing the valve, pressure surges arise that generate hydraulic oscillations, which in turn stimulate the mounting structure on the valve to vibrate, resulting in conspicuous, unwanted noise. The predetermined by the elongated, hollow cylindrical flow channel shape of the fluid volume leads to pronounced hydraulic resonances over the entire length of the valve, which couple particularly well to installation-related, strucural longitudinal resonances of the valve of typically 3 kHz.

Aus DE102010030383 ist ein Ventil zum Zumessen eines Fluids, insbesondere zum Einspritzen von Kraftstoff in einer Kraftstoffeinspritzanlage von Brennkraftmaschinen, bekannt. Der Strömungskanal ist durch einen im Ventil eingebauten Führungskörper mit einer Basisscheibe und einem bohrungsartigen Fluiddurchtritt in seiner Durchflussweite eingeschränkt. Auf diese Weise wird der Gesamtströmungskanal in mindestens zwei voneinander getrennte Kanalabschnitte unterteilt, wobei zwischen den in Strömungsrichtung aufeinanderfolgenden Kanalabschnitten im Bereich des Fluiddurchtritts eine gedrosselte Strömungsverbindung besteht.Out DE102010030383 is a valve for metering a fluid, in particular for injecting fuel in a fuel injection system of internal combustion engines, known. The flow channel is limited by a built-in valve guide body with a base disk and a bore-like fluid passage in its flow. In this way, the total flow channel is subdivided into at least two mutually separate channel sections, whereby a throttled flow connection exists between the passage sections following one another in the flow direction in the region of the fluid passage.

Offenbarung der ErfindungDisclosure of the invention

Das erfindungsgemäße Ventil mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass durch die Unterteilung des Strömungskanals in mehrere voneinander separierte Kanalabschnitte und der Herstellung einer Strömungsverbindung zwischen den in Strömungsrichtung aufeinanderfolgenden Kanalabschnitten die bauformbedingten Hydraulikresonanzen so beeinflusst werden können, dass eine Anregung kritischer, einbaubedingter Strukurmoden nicht mehr erfolgt, also Hydraulikresonanzen im kritischen Frequenzbereich von typischerweise 3 kHz nicht mehr entstehen können. Im einfachsten Fall erfolgt die Unterteilung des Strömungskanals in zwei Kanalabschnitte, und damit die Teilung des Fluidvolumens in zwei Teilvolumen, auf halber Länge des Strömungskanals. Abhängig von der erforderlichen Frequenzverschiebung sind auch andere Teilungsverhältnisse und auch mehrere Unterteilungen des Strömungskanals mit unterschiedlichen Teilungsverhältnissen möglich.The valve according to the invention with the features of claim 1 has the advantage that the design-related hydraulic resonances can be influenced by the subdivision of the flow channel into a plurality of mutually separated channel sections and the establishment of a flow connection between the successive channel sections in the flow direction, that an excitation critical, built-in Strukurmoden no longer takes place, so hydraulic resonances in the critical frequency range of typically 3 kHz can no longer arise. In the simplest case, the subdivision of the flow channel into two channel sections, and thus the division of the fluid volume into two sub-volumes, takes place at half the length of the flow channel. Depending on the required frequency shift, other division ratios and also several subdivisions of the flow channel with different division ratios are possible.

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 ist die Unterteilung des Strömungskanals und die Herstellung der Strömungsverbindung zwischen den Kanalabschnitten dadurch realisiert, dass an mindestens einer Kanalstelle im Strömungskanal ein Ring mit Ringspalt und einer der radialen Kanalbreite entsprechenden Ringstärke oder Ringdicke oder radialen Ringwandabmessung in den Strömungskanal eingelegt ist. Ein solcher Ring weist vorteilhaft einen rechteckigen oder kreisrunden Querschnitt auf und ist aus einem Band oder Draht mit rechteckigem oder kreisrundem Querschnitt hergestellt. Der Ring ist im Strömungskanal fixiert, was vorzugsweise durch formschlüssiges Eintauchen des Rings in mindestens eine Ringnut, die in die innere und/oder äußere Kanalwand des Strömungskanals eingearbeitet ist, vorgenommen ist.According to an advantageous embodiment of the invention, the subdivision of the flow channel and the production of the flow connection between the channel sections is realized in that at least one channel location in the flow channel, a ring with an annular gap and one of the radial channel width corresponding ring thickness or ring thickness or radial annular wall dimension is inserted into the flow channel , Such a ring advantageously has one rectangular or circular cross section and is made of a band or wire with a rectangular or circular cross-section. The ring is fixed in the flow channel, which is preferably done by positive immersion of the ring in at least one annular groove which is incorporated in the inner and / or outer channel wall of the flow channel.

Gemäß einer vorteilhaften Ausführungsform der Erfindung sind an mindestens einer Kanalstelle im Strömungskanal zwei Ringe im kurzen Abstand hintereinander angeordnet. Vorteilhaft sind dabei die Ringe so ausgerichtet, dass ihre Ringspalte gegeneinander in Umfangsrichtung verdreht sind, vorzugsweise um 180°. Diese konstruktive Anordnung der Ringe hat den Vorteil, dass zwischen zwei aufeinanderfolgenden Kanalabschnitten ein Zwischenvolumen des Fluids erzeugt wird.According to an advantageous embodiment of the invention, two rings are arranged one behind the other at a short distance at least one channel location in the flow channel. Advantageously, the rings are aligned so that their annular gaps are rotated against each other in the circumferential direction, preferably by 180 °. This constructive arrangement of the rings has the advantage that between two successive channel sections, an intermediate volume of the fluid is generated.

Gemäß einer alternativen Ausführungsform der Erfindung ist die Unterteilung des Strömungskanals und die Strömungsverbindung zwischen den generierten Kanalabschnitten dadurch realisiert, dass an mindestens einer Stelle im Strömungskanal eine Querschnittsverengung vorgenommen ist. Diese Querschnittsverengung wird vorteilhaft dadurch erreicht, dass von mindestens einer der beiden Kanalwände des Strömungskanals eine an der Kanalwand umlaufende Nase in den Strömungskanal hineinragt, die vorzugsweise durch eine in die Kanalwand eingearbeitete Vertiefung hergestellt ist. Eine solche umlaufende Verengung des Strömungsquerschnitts des Strömungskanals hat den Vorteil, dass abhängig vom Fluiddruck der Querschnitt der Verengung sich verändert, und zwar mit zunehmendem Druck zunimmt. Bei abgesenktem Druck ist damit eine wirksamere Unterteilung des Fluidvolumens vorhanden als bei hohem Druck, so dass bei hohem Druck (erhöhte Motorlast) eine evtl. durch die Fluidvolumen-Unterteilung entstehende Beeinträchtigung des Ventilbetriebs sich vorteilhaft verringert. Die Betriebspunkte mit hohem Druck sind in der Regel unkritisch für Geräuscherzeugung und benötigen ohnehin keine Geräuschgegenmaßnahmen.According to an alternative embodiment of the invention, the subdivision of the flow channel and the flow connection between the generated channel sections is realized in that at least one point in the flow channel, a cross-sectional constriction is made. This cross-sectional constriction is advantageously achieved by protruding from at least one of the two channel walls of the flow channel a circumferential on the channel wall nose into the flow channel, which is preferably made by a recess incorporated in the channel wall. Such a circumferential constriction of the flow cross section of the flow channel has the advantage that, depending on the fluid pressure, the cross section of the constriction changes, namely increases with increasing pressure. At lower pressure thus a more effective subdivision of the fluid volume is present than at high pressure, so that at high pressure (increased engine load) possibly resulting from the fluid volume division impairment of the valve operation is advantageously reduced. The operating points with high pressure are generally not critical for noise generation and require no noise countermeasures anyway.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Die Erfindung ist anhand von in den Zeichnungen dargestellten Ausführungsbeispielen in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

  • Figur 1 einen Längsschnitt eines Ventils zum Zumessen eines Fluids,
  • Figur 2 eine vergrößerte Darstellung des Ausschnitts A in Figur 1,
  • Figur 3 eine vergrößerte Darstellung des Ausschnitts A gemäß einem zweiten Ausführungsbeispiel mit einem im Strömungskanal einliegenden Ring mit rechteckigem Ringquerschnitt,
  • Figur 4 eine perspektivische Darstellung des Rings in Figur 3,
  • Figur 5 eine vergrößerte Darstellung des Ausschnitts A in Figur 1 gemäß einem dritten Ausführungsbeispiel mit einem im Strömungskanal einliegenden Ring mit kreisrundem Ringquerschnitt,
  • Figur 6 eine perspektivische Darstellung des Rings gemäß Figur 5,
  • Figur 7 eine vergrößerte Darstellung des Ausschnitts A in Figur 1 gemäß einem vierten Ausführungsbeispiel mit zwei im kurzen Abstand voneinander im Strömungskanal einliegenden Ringen mit kreisrundem Ringquerschnitt,
  • Figur 8 eine perspektivische Darstellung der beiden Ringe gemäß Figur 7.
The invention is explained in more detail in the following description with reference to exemplary embodiments illustrated in the drawings. Show it:
  • FIG. 1 a longitudinal section of a valve for metering a fluid,
  • FIG. 2 an enlarged view of the section A in FIG. 1 .
  • FIG. 3 an enlarged view of the section A according to a second embodiment with an in-flow channel ring with a rectangular ring cross section,
  • FIG. 4 a perspective view of the ring in FIG. 3 .
  • FIG. 5 an enlarged view of the section A in FIG. 1 according to a third embodiment with a ring in the flow channel with a circular ring cross section,
  • FIG. 6 a perspective view of the ring according to FIG. 5 .
  • FIG. 7 an enlarged view of the section A in FIG. 1 according to a fourth embodiment with two rings at a short distance from each other in the flow channel with a circular ring cross section,
  • FIG. 8 a perspective view of the two rings according to FIG. 7 ,

Das in Figur 1 im Längsschnitt dargestellte Ventil zum Zumessen eines Fluids wird vorzugsweise als Einspritzventil zum Einspritzen von Kraftstoff in einer Kraftstoffeinspritzanlage von Brennkraftmaschinen eingesetzt, wobei vorzugsweise der Kraftstoff in den Verbrennungszylinder der Brennkraftmaschine eingespritzt wird. Das Ventil weist einen Zulauf 11 für das Fluid, eine Zumessöffnung 12 für das Fluid und einen vom Zulauf 11 zur Zumessöffnung 12 führenden, langgestreckten, hohlzylindrischen Strömungskanal 13 auf. Der Strömungskanal 13 besitzt eine äußere Kanalwand 13a, die von einem rohrförmigen Ventilgehäuse 14 gebildet ist, und eine innere Kanalwand 13b, die von einer im Ventilgehäuse 14 konzentrisch angeordneten Hülse 15 gebildet ist. Das Ventilgehäuse 14 ist an seinem einen Stirnende von einem Anschlussstück 16 und an seinem anderen Stirnende von einem Ventilkörper fluiddicht abgeschlossen. Das Anschlussstück 16 enthält den Zulauf 11 während im Ventilkörper 17 die Zumessöffnung 12 ausgebildet ist. Die Hülse 15 ist mit ihrem einen Hülsenende an dem Anschlussstück 16 und mit ihrem anderen Hülsenende an dem Ventilkörper 17 fluiddicht festgelegt. In der Hülse 15 ist eine Ventilbaugruppe integriert, die aus einem am Anschlussstück 16 kardanisch gelagerten hydraulischen Koppler 18, einem mit dem Koppler 18 verbundenen piezoelektrischen oder magnetostriktiven Aktor 19 und einer am Ventilkörper 17 sich abstützenden Ventilschließfeder 20 besteht. Aktor 19 und Ventilschließfeder 20 greifen mit einander entgegengesetzten Wirkrichtungen an einer Ventilnadel 21 an, die im Ventilkörper 17 axial verschieblich geführt ist und mit einem Schließkopf 22, der mit einem die Zumessöffnung 12 umgebenden Ventilsitz 23 zusammenwirkt, die Zumessöffnung 12 steuert.This in FIG. 1 In longitudinal section shown valve for metering a fluid is preferably used as an injection valve for injecting fuel in a fuel injection system of internal combustion engines, wherein preferably the fuel is injected into the combustion cylinder of the internal combustion engine. The valve has an inlet 11 for the fluid, an orifice 12 for the fluid, and an elongated, hollow cylindrical flow channel 13 leading from the inlet 11 to the orifice 12. The flow channel 13 has an outer channel wall 13 a, which is formed by a tubular valve housing 14, and an inner channel wall 13 b, which is formed by a valve housing 14 concentrically arranged sleeve 15. The valve housing 14 is closed fluid-tight at one end face of a connector 16 and at its other end of a valve body. The connecting piece 16 contains the inlet 11 while in the valve body 17, the metering opening 12 is formed. The sleeve 15 is fixed in a fluid-tight manner with its one sleeve end to the connecting piece 16 and with its other sleeve end to the valve body 17. In the sleeve 15, a valve assembly is integrated, which consists of a kardanisch on the connector 16 mounted hydraulic coupler 18, a connected to the coupler 18 piezoelectric or magnetostrictive actuator 19 and a valve body 17 is supported valve closing spring 20. Actuator 19 and valve closing spring 20 engage with opposite directions of action on a valve needle 21 which is guided axially displaceably in the valve body 17 and the metering opening 12 controls with a closing head 22 which cooperates with a valve seat 23 surrounding the metering orifice 12.

Der Aktor 19 ist über eine Kontaktbrücke 24 mit einem elektrischen Anschlussstecker 25 verbunden und hebt bei Bestromung den Schließkopf 22 der Ventilnadel 21 gegen die Rückstellkraft der Ventilschließfeder 20 vom Ventilsitz 23 nach außen ab. Bei Wegfall der Bestromung drückt die beim Öffnen der Zumessöffnung 12 über die Ventilnadel 21 gespannte Ventilschließfeder 20 den Schließkopf 22 wieder auf den Ventilsitz 23 auf, so dass die Zumessöffnung 12 geschlossen ist. Die Verbindung von Strömungskanal 13 und Zumessöffnung 12 ist innerhalb des Ventilkörpers 17 durch eine der Zumessöffnung 12 vorgelagerte Ventilkammer 26 und eine vom Strömungskanal 13 zur Ventilkammer 26 führende Radialbohrung 27 hergestellt, während der Strömungskanal 13 durch eine in das Anschlussstück 16 eingebrachte Verbindungsbohrung 33 am Zulauf 11 angeschlossen ist..The actuator 19 is connected via a contact bridge 24 with an electrical connector 25 and lifts when energized the closing head 22 of the valve needle 21 against the restoring force of the valve closing spring 20 from the valve seat 23 to the outside. When the energization ceases, the valve-closing spring 20, which is tensioned when the orifice 12 is opened via the valve needle 21, pushes the closing head 22 back onto the valve seat 23, so that the orifice 12 is closed. The connection of the flow channel 13 and the metering opening 12 is produced within the valve body 17 by a valve chamber 26 upstream of the metering opening 12 and a radial bore 27 leading from the flow channel 13 to the valve chamber 26, while the flow channel 13 is connected to the inlet 11 through a connecting bore 33 introduced into the connector 16 connected..

Um die eingangs beschriebenen, bauformbedingten Hydraulikresonanzen so zu beeinflussen, dass eine Anregung kritischer, einbaubedingter Strukturmoden nicht mehr erfolgen kann, ist der Strömungskanal 13 mit ringförmigem Strömungsquerschnitt in mindestens zwei voneinander separierte Kanalabschnitte 131, 132 unterteilt und zwischen den Kanalabschnitten 131, 132 eine Strömungsverbindung für das Fluid hergestellt. Im einfachsten Fall erfolgt die Unterteilung des Strömungskanals 13 im Teilerverhältnis 1:1. Entsprechend einer erwünschten Frequenzverschiebung können aber auch andere Teilungsverhältnisse sowie die Unterteilung des Strömungskanals 13 in mehr als zwei Kanalabschnitte erforderlich sein.In order to influence the design-related hydraulic resonances described at the outset such that excitation of critical structural modes can no longer take place, the flow channel 13 with an annular flow cross section is subdivided into at least two mutually separated channel sections 131, 132 and a flow connection between the channel sections 131, 132 the fluid is made. In the simplest case, the subdivision of the flow channel 13 in the divider ratio is 1: 1. But according to a desired frequency shift can also others Division ratios and the subdivision of the flow channel 13 may be required in more than two channel sections.

Die Unterteilung des Strömungskanals 13 in zwei oder mehrere Kanalabschnitte und die Herstellung der Strömungsverbindung zwischen den Kanalabschnitten kann an einer oder mehreren Kanalstellen in verschiedenen Weisen realisiert werden.The subdivision of the flow channel 13 into two or more channel sections and the establishment of the flow connection between the channel sections can be realized at one or more channel locations in various ways.

In dem in Figur 2 vergrößert darstellten Ausschnitt A des Strömungskanals 13 ist an einer Kanalstelle im Strömungskanal 13 eine Querschnittsverengung des ringförmigen Querschnitts des Strömungskanals 13 vorgenommen. Hierzu ist in die von dem Ventilgehäuse 14 gebildeten äußere Kanalwand 13a eine ringförmige Vertiefung 28 eingeprägt, die eine in den Strömungskanal 13 hineinragende, an der Kanalwand 13a umlaufende Nase 29 ergibt. Die gleiche Nase 29 kann auch alternativ an der von der Hülse 15 gebildeten inneren Kanalwand 13b vorhanden sein. Die Anordnung jeweils einer Nase 29 an der inneren Kanalwand 13b und an der äußeren Kanalwand 13a ist möglich, wobei die Nasen 29 einander gegenüberliegen oder in kurzem Abstand gegeneinander versetzt sein können. Die in axialer Richtung gesehene Breite der Nase 29 kann nach dem Grad der gewünschten Drosselung eingestellt werden. Typische Breiten sind 1 -10 mm. Die in radialer Richtung gesehen verbleibende Weite des Strömungskanals 13 an der Kanalstelle (Spaltweite) kann ebenfalls nach dem gewünschten Grad der Drosselung weiter oder enger eingestellt werden. Typische Spaltweiten sind 0.01 - 0.1 mm.In the in FIG. 2 enlarged represented cutout A of the flow channel 13 is at a channel location in the flow channel 13, a cross-sectional constriction of the annular cross section of the flow channel 13 made. For this purpose, in the formed by the valve housing 14 outer channel wall 13a an annular recess 28 is impressed, which results in a projecting into the flow channel 13, on the channel wall 13a circumferential nose 29. The same lug 29 may alternatively be present on the inner channel wall 13b formed by the sleeve 15. The arrangement of a respective nose 29 on the inner channel wall 13b and on the outer channel wall 13a is possible, wherein the lugs 29 are opposite to each other or may be offset from each other at a short distance. The width of the nose 29 seen in the axial direction can be adjusted according to the degree of desired throttling. Typical widths are 1 -10 mm. The remaining in the radial direction width of the flow channel 13 at the channel location (gap width) can also be adjusted according to the desired degree of throttling or narrower. Typical gap widths are 0.01 - 0.1 mm.

In den Figuren 3 bis 8 sind drei weitere Ausführungsbeispiele dargestellt, wie an einer Kanalstelle des Strömungskanals 13 eine Unterteilung in zwei aufeinander folgende Kanalabschnitte 131 und 132 mit einer Strömungsverbindung zwischen den Kanalabschnitten 131 und 132 erzielt wird. In allen drei Fällen werden Ringe 30 mit einem Ringspalt 31 und einer der radialen Kanalbreite des Strömungskanals 13 entsprechenden Ringstärke oder Ringdicke oder radialen Ringwandabmessung verwendet, die in den Strömungskanal 13 eingesetzt sind.In the FIGS. 3 to 8 three further embodiments are shown, as at a channel location of the flow channel 13, a division into two consecutive channel sections 131 and 132 is achieved with a flow connection between the channel sections 131 and 132. In all three cases rings 30 are used with an annular gap 31 and a radial channel width of the flow channel 13 corresponding ring thickness or ring thickness or radial annular wall dimension, which are inserted into the flow channel 13.

In den beiden Ausführungsbeispielen gemäß Figur 3 bis 6 liegt an der Kanalstelle des Strömungskanals 13 ein Ring 30 ein. Der Ring 30 ist im Strömungskanal 13 an mindestens einer Kanalwand fixiert, wobei die Fixierung dadurch erfolgt, dass der Ring 30 teilweise in mindestens eine der Kanalwände 13a, 13b eingearbeitete Ringnut 32 formschlüssig eintaucht. Im Ausführungsbeispiel der Figur 3 und 4 weist der Ring 30 einen rechteckigen Querschnitt auf und ist die Ringnut 32 in die innere Kanalwand 13b eingearbeitet. Vorzugsweise ist der Ring 30 aus einem Band hergestellt. Im Ausführungsbeispiel der Figur 5 und 6 weist der Ring 30 einen kreisrunden Querschnitt auf und die Ringnut 32 ist von einer von der Innenseite der äußeren Kanalwand 13a aus in die äußeren Kanalwand 13a eingeprägten, ringförmigen Sicke gebildet. Vorzugsweise ist der Ring 30 aus einem Draht hergestellt.In the two embodiments according to FIGS. 3 to 6 is located at the channel location of the flow channel 13, a ring 30 a. The ring 30 is in Flow channel 13 fixed to at least one channel wall, wherein the fixation is effected in that the ring 30 partially inserted into at least one of the channel walls 13a, 13b incorporated annular groove 32 positively. In the embodiment of FIGS. 3 and 4 the ring 30 has a rectangular cross section and the annular groove 32 is incorporated into the inner channel wall 13b. Preferably, the ring 30 is made of a band. In the embodiment of FIGS. 5 and 6 For example, the ring 30 has a circular cross-section and the annular groove 32 is formed by an annular bead embossed into the outer channel wall 13a from the inside of the outer channel wall 13a. Preferably, the ring 30 is made of a wire.

Im Ausführungsbeispiel der Figur 7 und 8 sind an der Kanalstelle zwei im kurzen Abstand hintereinander angeordnete und parallel zueinander ausgerichtete Ringe 30 in den Strömungskanal 13 eingelegt. Wie in Figur 5 und 6 weist jeder Ring 30 einen kreisrunden Querschnitt auf und taucht teilweise in eine Ringnut 32 ein, die jeweils von einer ringförmige Sicke gebildet ist, die in die äußere Kanalwand 13a von deren Innenseite aus eingeprägt ist. Wie Figur 8 zeigt, werden dabei die Ringe 30 so ausgerichtet, dass ihre Ringspalte 31 gegeneinander verdreht sind. Bevorzugt wird dabei eine Verdrehung der Ringspalte um 180°. Die Anordnung von zwei etwas voneinander beabstandeten Ringen 30 hat den Vorteil, dass zwischen zwei aufeinander folgenden Kanalabschnitten ein Zwischenvolumen des Fluids erzeugt wird. Der gleiche Effekt wird durch die vorstehend erwähnte Anordnung von zwei Nasen 29 an der äußeren und inneren Kanalwand 13a 13b, die in kurzem Abstand gegeneinander versetzt sind, erzielt.In the embodiment of FIGS. 7 and 8 are at the channel location two at a short distance one behind the other arranged and parallel aligned rings 30 inserted into the flow channel 13. As in FIGS. 5 and 6 each ring 30 has a circular cross-section and partially immersed in an annular groove 32, each formed by an annular bead which is embossed in the outer channel wall 13a from the inside thereof. As FIG. 8 shows, while the rings 30 are aligned so that their annular gaps 31 are rotated against each other. Preference is given to a rotation of the annular gap by 180 °. The arrangement of two slightly spaced rings 30 has the advantage that an intermediate volume of the fluid is created between two consecutive channel sections. The same effect is achieved by the above-mentioned arrangement of two lugs 29 on the outer and inner channel wall 13a 13b, which are offset from each other at a short distance.

Claims (13)

  1. Valve for metering in a fluid, in particular for injecting fuel in a fuel injection system of internal combustion engines, having an inflow (11) for the fluid, having a metering opening (12) for the fluid, and having an elongate, hollow-cylindrical flow channel (13) which leads from the inflow (11) to the metering opening (12) and has an outer and inner channel wall (13a, 13b), characterized in that the flow channel (13) is divided into at least two channel sections (131, 132) which are separated from one another, and there is a throttled flow connection for the fluid between channel sections (131, 132) which follow one another in the flow direction, characterized in that the throttled flow connection is configured between a tubular valve housing (14) and a sleeve (15) which delimit the hollow-cylindrical flow channel (13) upstream and downstream of the throttled flow connection and in the process run in an uninterrupted manner, since the outer channel wall (13a) of the flow channel (13) is formed by the tubular valve housing (14), and the inner channel wall (13b) of the flow channel (13) is formed by the sleeve (15) which is arranged coaxially with respect to the valve housing (14) and receives a valve assembly, the valve housing (14) being closed off in each case in a fluid-tight manner on one end side by way of a connecting piece (16) which contains the inflow (11) and on the other end side by way of a valve body (17) which contains the metering opening (12), and the sleeve (15) extending between the connecting piece (16) and the valve body (17) and being fixed in each case in a fluid-tight manner onto the connecting piece (16) and the valve body (17) by way of its sleeve ends.
  2. Valve according to Claim 1, characterized in that a ring (30) having a ring gap (31) which runs over its entire axial length and a ring thickness which corresponds to the radial channel width of the flow channel (13) is inserted into the flow channel (13) for division and flow connection purposes at at least one channel point in the flow channel (13).
  3. Valve according to Claim 2, characterized in that the ring (30) has a rectangular or circular cross section.
  4. Valve according to Claim 3, characterized in that the ring (30) is formed from a strip or a wire with a rectangular or circular cross section.
  5. Valve according to one of Claims 2 to 4, characterized in that the ring (30) is fixed in the flow channel (13) on at least one channel wall (13a, 13b).
  6. Valve according to Claim 5, characterized in that the ring (30) dips in a positively locking manner partially into at least one ring groove (32) which is machined in a channel wall (13a, 13b).
  7. Valve according to one of Claims 2 to 6, characterized in that two rings (30) are arranged at a small spacing behind one another at the at least one channel point in the flow channel (13).
  8. Valve according to Claim 7, characterized in that the rings (30) are oriented parallel to one another and in such a way that their ring gaps (31) are rotated with respect to one another in the circumferential direction.
  9. Valve according to Claim 8, characterized in that the rotation of the ring gaps (31) of the two rings (30) is 180°.
  10. Valve according to Claim 1, characterized in that a constriction of the flow cross section of the flow channel (13) is carried out for division and flow connection purposes at at least one channel point in the flow channel (13).
  11. Valve according to Claim 10, characterized in that the cross-sectional constriction is realised by means of at least one lug (29) which runs around on at least one channel wall (13a, 13b) and projects from the latter.
  12. Valve according to Claim 11, characterized in that the at least one lug (29) is produced by way of a depression (28) which is impressed into the channel wall.
  13. Valve according to Claim 1, characterized in that a connection (33) from the inflow (11) to the flow channel (13) is produced in the connecting piece (16), and a valve chamber (26) is positioned upstream of the metering opening (11) in the valve body (16), which valve chamber (26) is connected to the flow channel (13) via a bore (27) which is made in the valve body (17).
EP13702796.7A 2012-03-07 2013-01-30 Valve for metering a fluid Not-in-force EP2823176B1 (en)

Applications Claiming Priority (2)

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DE102012203607A DE102012203607A1 (en) 2012-03-07 2012-03-07 Valve for metering a fluid
PCT/EP2013/051803 WO2013131691A1 (en) 2012-03-07 2013-01-30 Valve for metering a fluid

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EP2823176A1 EP2823176A1 (en) 2015-01-14
EP2823176B1 true EP2823176B1 (en) 2017-04-19

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EP (1) EP2823176B1 (en)
JP (1) JP5933766B2 (en)
KR (1) KR20140133851A (en)
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DE (1) DE102012203607A1 (en)
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RU2014140230A (en) 2016-04-27
CN104350269B (en) 2017-09-15
WO2013131691A1 (en) 2013-09-12
JP5933766B2 (en) 2016-06-15
JP2015508861A (en) 2015-03-23
DE102012203607A1 (en) 2013-09-12
CN104350269A (en) 2015-02-11
US20150028136A1 (en) 2015-01-29
KR20140133851A (en) 2014-11-20
EP2823176A1 (en) 2015-01-14
RU2629851C2 (en) 2017-09-04

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