WO2013079693A1 - Valve arrangement - Google Patents

Valve arrangement Download PDF

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Publication number
WO2013079693A1
WO2013079693A1 PCT/EP2012/074152 EP2012074152W WO2013079693A1 WO 2013079693 A1 WO2013079693 A1 WO 2013079693A1 EP 2012074152 W EP2012074152 W EP 2012074152W WO 2013079693 A1 WO2013079693 A1 WO 2013079693A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
flow control
scroll spring
control valve
fluid
Prior art date
Application number
PCT/EP2012/074152
Other languages
German (de)
French (fr)
Inventor
Matthias Bleeck
Bernd Gugel
Burhan Dagdelen
Original Assignee
Continental Automotive 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 Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2013079693A1 publication Critical patent/WO2013079693A1/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
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • F02M59/367—Pump inlet valves of the check valve type being open when actuated
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric 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
    • 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
    • F02M63/0049—Combined valve units, e.g. for controlling pumping chamber and injection valve
    • 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
    • F02M63/0054—Check valves
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/14—Check valves with flexible valve members
    • F16K15/141—Check valves with flexible valve members the closure elements not being fixed to the valve body
    • F16K15/142—Check valves with flexible valve members the closure elements not being fixed to the valve body the closure elements being shaped as solids of revolution, e.g. toroidal or cylindrical rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0644—One-way valve
    • F16K31/0655—Lift valves
    • F16K31/0665—Lift valves with valve member being at least partially ball-shaped

Definitions

  • Valve arrangement The invention relates to a valve arrangement, in particular a valve arrangement for a high-pressure pump for an internal combustion engine.
  • injection systems For injecting fuel into combustion chambers of an internal combustion engine, in particular a diesel internal combustion engine or gasoline internal combustion engine, injection systems are used, which are designed as so-called common rail systems.
  • injectors from a common fuel storage, the common rail, supplied with fuel.
  • the fuel to be injected is in the
  • Injection systems for internal combustion engines usually have different pumps, by means of which fuel is conveyed to be introduced into combustion chambers of the internal combustion engine.
  • Such injection systems for internal combustion engines place high demands on the accuracy of the injection pressure required for injecting the fuel into the combustion chambers of the internal combustion engine.
  • the pumps which provide the necessary volume flow and the required fluid pressure, are subject to heavy loads, in particular mechanical stresses, in accumulator injection systems. From the individual components of such high-pressure pumps, such as the valves, large forces must be absorbed.
  • a valve arrangement comprises a volume flow control valve, which is designed to adjust a fluid inflow into a pump.
  • the valve assembly includes a check valve coupled to the flow control valve downstream of the flow control valve.
  • the check valve is designed as a scroll spring.
  • the flow control valve is protected from pressure peaks from the downstream area.
  • the valve arrangement is in particular part of a high-pressure injection system of a motor vehicle. Pressure peaks from the high-pressure region, which is arranged downstream of the volume flow control valve, are damped by the check valve or is prevented by the check valve that the pressure peaks reach into inner regions of the volume flow control valve.
  • the scroll spring is designed so that it expands at a volume flow from the flow control valve and releases the fluid flow through the flow control valve in the direction of the high pressure region. A fluid flow in the opposite direction from the high-pressure region into the inner regions of the volume flow control valve is prevented by the scroll spring, since this is compressed by such a fluid flow St compressed. In the compressed state, the scroll spring is fluid-tight.
  • the volume flow control valve has a housing with a longitudinal axis surrounding a fluid inlet and a fluid outlet.
  • the scroll spring surrounds the housing coaxially with the longitudinal axis.
  • the scroll spring is in particular arranged so that it has a contact surface with the housing.
  • the scroll spring and the housing according to Embodiments on a direct contact with each other.
  • the scroll spring is wrapped around the housing.
  • the scroll spring has a first and a second end region, wherein the first end region is arranged so that the first end region overlaps the second end region.
  • the scroll spring has a central region which is arranged between the first and the second end region and which is formed in one layer.
  • the central region has a greater proportion of the roll spring than the overlapping end regions.
  • the scroll spring is formed from a spiral-shaped sheet metal.
  • the overlapping end portions are pressed against each other in the sealing state of the check valve. This prevents fluid flow through the check valve since the fluid can not get between the two overlapping end portions.
  • a fluid flow in the direction of the high-pressure region is released by the check valve, since the fluid flows outwardly from the inner of the scroll spring and thereby lifts the first end region from the second end region, so that there is a gap between the first end region and the second end region. Through this gap, the fluid flows.
  • the scroll spring is formed so that only overlap the two end portions and the majority of the scroll spring is formed without overlap.
  • FIG. 1 shows a schematic representation of a valve arrangement according to an embodiment
  • Figure 2 is a schematic representation of a check valve according to an embodiment in a first state
  • Figure 3 is a schematic representation of the check valve in another state.
  • FIG. 1 shows a schematic cross-sectional view of a valve arrangement 100.
  • the valve arrangement 100 has a volume flow control valve 110.
  • the valve assembly 100 further includes a check valve 120.
  • the volumetric flow control valve 110 is configured to adjust a fluid flow into a high-pressure pump, which is arranged downstream of the volumetric flow control valve 110.
  • the volume flow control valve 110 has a housing 111 with a longitudinal axis L.
  • the housing 111 surrounds a fluid inlet 112 and a fluid outlet 113.
  • a valve tappet 114 is disposed between the fluid inlet 112 and the fluid outlet 113.
  • the valve tappet 114 cooperates with a valve seat 115.
  • a fluid flow from the fluid inlet 112 to the fluid outlet 113 is made possible.
  • the valve lifter 114 abuts the sealing seat 115, fluid flow from the fluid inlet 112 to the fluid outlet 113 is inhibited.
  • the valve tappet 114 is movable by an actuator 117.
  • the actuator 117 is, for example, a magnetic actuator or a piezoelectric actuator.
  • a spring 116 which is disposed between the housing 111 and the valve stem 114, exerts a spring force on the valve stem 114, which is directed against an actuator force of the actuator 117.
  • the spring 116 is configured to press the valve lifter 114 against the sealing seat 115.
  • the volumetric flow control valve 110 controls the hydraulic volumetric flow through the volumetric flow control valve
  • the check valve 120 is formed as a scroll spring.
  • Rolling spring ( Figure 2) is formed in plan view circular or spiral.
  • the scroll spring is formed from a sheet metal strip which is rolled up so that a first end portion 122 overlaps a second end portion 123.
  • a central portion 124 between the two end portions 122 and 123 is formed in a single layer and has no portion of the scroll spring that overlaps it.
  • the scroll spring is arranged on the housing 111 in the region of the fluid outlet 113.
  • the scroll spring has a common contact surface 121 with the housing 111.
  • the housing 111 and the scroll spring touch each other.
  • the contact surface 121 surrounds the housing 111 in a circle.
  • the scroll spring is arranged coaxially with the longitudinal axis L on the housing 111.
  • the scroll spring is in particular connected to the housing 111 such that the contact surface 111 is fluid-tight. For the fluid, it is only possible the housing
  • the gap 125 is formed between the two End portions 122 and 123, when the first end portion 122 is spaced from the second end portion 123.
  • the check valve 120 blocks fluid flow from outside into the fluid outlet 113 when the first end portion 122 is in contact with the second end portion 123 (FIG. 3).
  • the fluid pushes the first end portion 122 on the second end portion 123 and thus no flow of the scroll spring between the two end portions 122 and 123 from the high-pressure region A in the direction of the low-pressure region P is possible.
  • the check valve 120 releases fluid flow from the fluid inlet 112 to the fluid outlet 113 and on to the downstream pump when the pressure on the flow control valve 110 side of the check valve 120 is greater than the pressure on the flow control valve 110 side away of the check valve 120.
  • the first end portion 122 is depressed from the second end portion 123 by the fluid flowing out of the fluid outlet 113 ( Figure 2).
  • the fluid flows through the resulting gap 125 between the first end portion 122 and the second end portion 123.
  • the fluid flows from a low pressure region P through the volume flow control valve 110 and the check valve 120 to a high pressure region A.
  • the check valve 120 When pressure peaks from the high pressure area A of the injection system, the check valve 120 is compressed, so that the fluid pressure acting on the check valve 120 from the outside, is greater than the fluid pressure in the fluid outlet 113 ( Figure 3).
  • the end portion 122 is pressed toward the end portion 123 and comes into contact with the end portion 123.
  • the two end portions 122 and 123 are compressed and thus seal the check valve 120, so that the pressure peaks can not enter the inside of the flow control valve 110.
  • the valve arrangement 100 with the volume flow control valve 110 and the check valve 120 which is designed as a scroll spring, the control behavior of the volume flow control valve 110 is improved because the pressure peaks from the high pressure region of the pump do not enter the interior of the volume flow control valve 110 or into the interior of the housing 111.
  • a force on the valve stem 114 by the pressure peaks, which has a movement of the valve stem 114 result is avoided. This allows precise and reliable control.
  • the volume flow control valve 110 is protected in a simple and cost-effective manner. Since the pressure peaks do not reach the interior of the volume flow control valve 110, the components of the volume flow control valve 110 are protected, in particular the magnetic components of the actuator 117. The pressure peaks, which conventionally lead to a rapid and uncontrolled movement, for example, the valve stem 114 are damped or completely blocked and Thus, the components of the flow control valve 110 protected against bursting. In particular, the magnet of the actuator 117 is protected because the pressure peaks do not act inside the magnet. Thus, reliable operation is possible.
  • the volume flow control valve 110 is formed in the illustrated embodiments as a seat valve.
  • the volume ⁇ flow control valve 110 is formed according to other embodiments in a different construction, for example, executed in a sliding construction, which has a pressure compensation ⁇ .
  • the check valve 120 is used in such Ausure ⁇ insurance forms primarily to protect the magnetic components of the flow control valve.

Abstract

A valve arrangement comprises: - a volume flow control valve (110) which is designed for adjusting a fluid inflow into a pump, - a check valve (120) which is coupled, downstream of the volume flow control valve (110), to the volume flow control valve (110) and which is in the form of a scroll spring.

Description

Beschreibung Ventilanordnung Die Erfindung betrifft eine Ventilanordnung, insbesondere eine Ventilanordnung für eine Hochdruckpumpe für eine Brennkraftmaschine . Description Valve arrangement The invention relates to a valve arrangement, in particular a valve arrangement for a high-pressure pump for an internal combustion engine.
Zum Einspritzen von Kraftstoff in Brennräume einer Brenn- kraftmaschine, insbesondere einer Dieselbrennkraftmaschine oder Benzinbrennkraftmaschine, kommen Einspritzanlagen zum Einsatz, die als sogenannte Common-Rail Anlagen ausgeführt sind. Bei diesen werden in den Brennräumen angeordnete Injektoren aus einem gemeinsamen KraftstoffSpeicher , dem Common Rail, mit Kraftstoff versorgt. Der einzuspritzende Kraftstoff liegt dabei im For injecting fuel into combustion chambers of an internal combustion engine, in particular a diesel internal combustion engine or gasoline internal combustion engine, injection systems are used, which are designed as so-called common rail systems. In these arranged in the combustion chambers injectors from a common fuel storage, the common rail, supplied with fuel. The fuel to be injected is in the
KraftstoffSpeicher unter einem Druck von bis zu über 2000 bar vor .  Fuel storage under a pressure of up to over 2000 bar before.
Einspritzanlagen für Brennkraftmaschinen weisen üblicherweise verschiedene Pumpen auf, mittels derer Kraftstoff gefördert wird, um in Brennräume der Brennkraftmaschine eingebracht zu werden. Derartige Einspritzanlagen für Brennkraftmaschinen stellen hohe Anforderungen an die Genauigkeit des zur Einspritzung des Kraftstoffs in die Brennräume der Brennkraftmaschine erforderlichen Einspritzdrucks. Dabei unterliegen die Pumpen, die den notwendigen Volumenstrom und den erforderlichen Fluiddruck bereitstellen, in Speichereinspritzsystemen starken Belastungen, insbesondere mechanischen Beanspruchungen. Von den einzelnen Bauteilen von derartigen Hochdruckpumpen, beispielsweise den Ventilen, müssen große Kräfte aufgenommen werden können. Injection systems for internal combustion engines usually have different pumps, by means of which fuel is conveyed to be introduced into combustion chambers of the internal combustion engine. Such injection systems for internal combustion engines place high demands on the accuracy of the injection pressure required for injecting the fuel into the combustion chambers of the internal combustion engine. The pumps, which provide the necessary volume flow and the required fluid pressure, are subject to heavy loads, in particular mechanical stresses, in accumulator injection systems. From the individual components of such high-pressure pumps, such as the valves, large forces must be absorbed.
Es ist wünschenswert, eine Ventilanordnung anzugeben, die einen zuverlässigen und präzisen Betrieb ermöglicht und dabei einem geringen Verschleiß unterliegt. Gemäß einer Ausführungsform der Erfindung umfasst eine Ventilanordnung ein Volumenstromsteuerventil, das ausgebildet ist zum Einstellen eines Fluidzuflusses in eine Pumpe. Die Ventilanordnung umfasst ein Rückschlagventil, das stromabwärts des Volumenstromsteuerventils mit dem Volumenstromsteuerventil gekoppelt ist. Das Rückschlagventil ist als Rollfeder ausgebildet . It is desirable to provide a valve assembly which allows reliable and accurate operation while being subject to little wear. According to one embodiment of the invention, a valve arrangement comprises a volume flow control valve, which is designed to adjust a fluid inflow into a pump. The valve assembly includes a check valve coupled to the flow control valve downstream of the flow control valve. The check valve is designed as a scroll spring.
Durch das als Rollfeder ausgebildete Rückschlagventil ist das Volumenstromsteuerventil vor Druckspitzen aus dem stromabwärts gelegenen Bereich geschützt. Die Ventilanordnung ist insbesondere Teil eines Hochdruckeinspritzsystems eines Kraftfahrzeugs. Druckspitzen aus dem Hochdruckbereich, der stromabwärts des Volumenstromsteuerventils angeordnet ist, werden durch das Rückschlagventil abgedämpft beziehungsweise wird durch das Rückschlagventil verhindert, dass die Druckspitzen in innere Bereiche des Volumenstromsteuerventils gelangen. Die Rollfeder ist so ausgebildet, dass sie sich bei einem Volumenstrom aus dem Volumenstromsteuerventil aufweitet und den Fluidfluss durch das Volumenstromsteuerventil in Richtung des Hochdruckbereichs freigibt. Ein Fluidfluss in die entgegen gesetzte Richtung aus dem Hochdruckbereich in die inneren Bereiche des Volumenstromsteuerventils wird durch die Rollfeder verhindert, da diese durch einen derartigen Fluidfluss zusammengepres st wird. In dem zusammengepressten Zustand ist die Rollfeder fluiddicht. By designed as a scroll spring check valve, the flow control valve is protected from pressure peaks from the downstream area. The valve arrangement is in particular part of a high-pressure injection system of a motor vehicle. Pressure peaks from the high-pressure region, which is arranged downstream of the volume flow control valve, are damped by the check valve or is prevented by the check valve that the pressure peaks reach into inner regions of the volume flow control valve. The scroll spring is designed so that it expands at a volume flow from the flow control valve and releases the fluid flow through the flow control valve in the direction of the high pressure region. A fluid flow in the opposite direction from the high-pressure region into the inner regions of the volume flow control valve is prevented by the scroll spring, since this is compressed by such a fluid flow St compressed. In the compressed state, the scroll spring is fluid-tight.
Gemäß Ausführungsformen weist das Volumenstromsteuerventil ein Gehäuse mit einer Längsachse auf, das einen Fluideinlass und einen Fluidauslass umgibt. Die Rollfeder umgibt das Gehäuse koaxial zur Längsachse. Somit ist ein zuverlässiger Schutz des Volumenstromsteuerventils möglich. Die Rollfeder ist insbesondere so angeordnet, dass sie eine Kontaktfläche mit dem Gehäuse aufweist. Die Rollfeder und das Gehäuse weisen gemäß Ausführungsformen einen direkten Kontakt zueinander auf. Die Rollfeder ist um das Gehäuse gewickelt. According to embodiments, the volume flow control valve has a housing with a longitudinal axis surrounding a fluid inlet and a fluid outlet. The scroll spring surrounds the housing coaxially with the longitudinal axis. Thus, a reliable protection of the flow control valve is possible. The scroll spring is in particular arranged so that it has a contact surface with the housing. The scroll spring and the housing according to Embodiments on a direct contact with each other. The scroll spring is wrapped around the housing.
Gemäß Ausführungsformen weist die Rollfeder einen ersten und einen zweiten Endbereich auf, wobei der erste Endbereich so angeordnet ist, dass der erste Endbereich den zweiten Endbereich überlappt. Die Rollfeder weist einen Mittelbereich auf, der zwischen dem ersten und dem zweiten Endbereich angeordnet ist und der einlagig ausgebildet ist. According to embodiments, the scroll spring has a first and a second end region, wherein the first end region is arranged so that the first end region overlaps the second end region. The scroll spring has a central region which is arranged between the first and the second end region and which is formed in one layer.
Gemäß Ausführungsformen hat der Mittelbereich einen größeren Anteil an der Rollfeder als die überlappenden Endbereiche. Insbesondere ist die Rollfeder aus einem spiralförmigen Blech ausgebildet . According to embodiments, the central region has a greater proportion of the roll spring than the overlapping end regions. In particular, the scroll spring is formed from a spiral-shaped sheet metal.
Die überlappenden Endbereiche sind in dem abdichtenden Zustand des Rückschlagventils aneinander gepresst. Dadurch wird ein Fluidfluss durch das Rückschlagventil verhindert, da das Fluid nicht zwischen die beiden überlappenden Endbereiche gelangen kann. Ein Fluidfluss in Richtung des Hochdruckbereichs wird durch das Rückschlagventil freigegeben, da das Fluid aus dem inneren der Rollfeder nach außen fließt und dabei den ersten Endbereich von dem zweiten Endbereich abhebt, so dass ein Zwischenraum zwischen dem ersten Endbereich und dem zweiten Endbereich liegt. Durch diesen Zwischenraum fließt das Fluid. Die Rollfeder ist so ausgebildet, dass lediglich die beiden Endbereiche überlappen und der Großteil der Rollfeder ohne Überlappung ausgebildet ist. The overlapping end portions are pressed against each other in the sealing state of the check valve. This prevents fluid flow through the check valve since the fluid can not get between the two overlapping end portions. A fluid flow in the direction of the high-pressure region is released by the check valve, since the fluid flows outwardly from the inner of the scroll spring and thereby lifts the first end region from the second end region, so that there is a gap between the first end region and the second end region. Through this gap, the fluid flows. The scroll spring is formed so that only overlap the two end portions and the majority of the scroll spring is formed without overlap.
Weitere Vorteile, Merkmale und Weiterbildungen ergeben sich aus den nachfolgenden in Verbindung mit den Figuren erläutertenFurther advantages, features and developments emerge from the following explained in conjunction with the figures
Beispielen. Gleiche, gleichartige und gleich wirkende Elemente können in den Figuren mit den gleichen Bezugszeichen versehen sein. Die dargestellten Elemente und deren Größenverhältnisse sind grundsätzlich nicht als maßstabsgerecht anzusehen. Es zeigen: Examples. The same, similar and equally acting elements may be provided in the figures with the same reference numerals. The illustrated elements and their proportions are basically not to be considered as true to scale. Show it:
Figur 1 eine schematische Darstellung einer Ventilanordnung gemäß einer Ausführungsform, 1 shows a schematic representation of a valve arrangement according to an embodiment,
Figur 2 eine schematische Darstellung eines Rückschlagventils gemäß einer Ausführungsform in einem ersten Zustand, und Figure 2 is a schematic representation of a check valve according to an embodiment in a first state, and
Figur 3 eine schematische Darstellung des Rückschlagventils in einem weiteren Zustand. Figure 3 is a schematic representation of the check valve in another state.
Figur 1 zeigt eine schematische Querschnittsansicht einer Ventilanordnung 100. Die Ventilanordnung 100 weist ein Volumenstromsteuerventil 110 auf. Die Ventilanordnung 100 weist weiterhin ein Rückschlagventil 120 auf. FIG. 1 shows a schematic cross-sectional view of a valve arrangement 100. The valve arrangement 100 has a volume flow control valve 110. The valve assembly 100 further includes a check valve 120.
Das Volumenstromsteuerventil 110 ist dazu ausgebildet, einen Fluidfluss in eine Hochdruckpumpe einzustellen, die stromabwärts des Volumenstromsteuerventils 110 angeordnet ist. Das Volumenstromsteuerventil 110 weist ein Gehäuse 111 mit einer Längsachse L auf. Das Gehäuse 111 umgibt einen Fluideinlass 112 und einen Fluidauslass 113. Zwischen dem Fluideinlass 112 und dem Fluidauslass 113 ist ein Ventilstößel 114 angeordnet. Der Ventilstößel 114 wirkt mit einem Ventilsitz 115 zusammen. Abhängig von der axialen Stellung des Ventilstößels 114 ist ein Fluidfluss von dem Fluideinlass 112 zu dem Fluidauslass 113 ermöglicht. Wenn der Ventilstößel 114 auf dem Dichtsitz 115 anliegt, ist ein Fluidfluss von dem Fluideinlass 112 zu dem Fluidauslass 113 unterbunden. The volumetric flow control valve 110 is configured to adjust a fluid flow into a high-pressure pump, which is arranged downstream of the volumetric flow control valve 110. The volume flow control valve 110 has a housing 111 with a longitudinal axis L. The housing 111 surrounds a fluid inlet 112 and a fluid outlet 113. Between the fluid inlet 112 and the fluid outlet 113, a valve tappet 114 is disposed. The valve tappet 114 cooperates with a valve seat 115. Depending on the axial position of the valve stem 114, a fluid flow from the fluid inlet 112 to the fluid outlet 113 is made possible. When the valve lifter 114 abuts the sealing seat 115, fluid flow from the fluid inlet 112 to the fluid outlet 113 is inhibited.
Der Ventilstößel 114 ist durch einen Aktuator 117 bewegbar. Der Aktuator 117 ist beispielsweise ein magnetischer Aktuator oder ein piezoelektrischer Aktuator . Eine Feder 116, die zwischen dem Gehäuse 111 und dem Ventilstößel 114 angeordnet ist, wirkt eine Federkraft auf den Ventilstößel 114 aus, die entgegen einer Aktuatorkraft des Aktuators 117 gerichtet ist. Die Feder 116 ist dazu ausgebildet, den Ventilstößel 114 gegen den Dichtsitz 115 zu drücken. Das Volumenstromsteuerventil 110 steuert den hydraulischen Volumenstrom durch das VolumenstromsteuerventilThe valve tappet 114 is movable by an actuator 117. The actuator 117 is, for example, a magnetic actuator or a piezoelectric actuator. A spring 116, which is disposed between the housing 111 and the valve stem 114, exerts a spring force on the valve stem 114, which is directed against an actuator force of the actuator 117. The spring 116 is configured to press the valve lifter 114 against the sealing seat 115. The volumetric flow control valve 110 controls the hydraulic volumetric flow through the volumetric flow control valve
110 in Abhängigkeit eines elektrischen Steuerstroms, der an dem Aktuator 117 anliegt. In Abhängigkeit dieses Steuerstroms wird ein hydraulischer Querschnitt eingestellt, der abhängig von dem Abstand zwischen dem Ventilstößel 114 und dem Dichtsitz 115 ist. Der hydraulische Querschnitt ist abhängig von dem vorgegebenen Volumenstrom . Das Rückschlagventil 120 ist als Rollfeder ausgebildet. Die110 in response to an electrical control current, which is applied to the actuator 117. In response to this control current, a hydraulic cross section is set, which is dependent on the distance between the valve stem 114 and the sealing seat 115. The hydraulic cross section depends on the given volume flow. The check valve 120 is formed as a scroll spring. The
Rollfeder (Figur 2) ist in Aufsicht kreisförmig beziehungsweise spiralförmig ausgebildet. Die Rollfeder ist aus einem Blechstreifen gebildet, der so aufgerollt ist, dass ein erster Endbereich 122 einen zweiten Endbereich 123 überlappt. Ein Mittelbereich 124 zwischen den beiden Endbereichen 122 und 123 ist einlagig ausgebildet und weist keinen Bereich der Rollfeder auf, die ihn überlappt. Rolling spring (Figure 2) is formed in plan view circular or spiral. The scroll spring is formed from a sheet metal strip which is rolled up so that a first end portion 122 overlaps a second end portion 123. A central portion 124 between the two end portions 122 and 123 is formed in a single layer and has no portion of the scroll spring that overlaps it.
Die Rollfeder ist an dem Gehäuse 111 im Bereich des Fluidauslasses 113 angeordnet. Die Rollfeder weist eine gemeinsame Kontaktfläche 121 mit dem Gehäuse 111 auf. Das Gehäuse 111 und die Rollfeder berühren einander. Die Kontaktfläche 121 umgibt das Gehäuse 111 kreisförmig. Die Rollfeder ist koaxial zur Längsachse L an dem Gehäuse 111 angeordnet. Die Rollfeder ist insbesondere so mit dem Gehäuse 111 verbunden, dass die Kontaktfläche 111 fluiddicht ist . Für das Fluid ist es lediglich möglich das GehäuseThe scroll spring is arranged on the housing 111 in the region of the fluid outlet 113. The scroll spring has a common contact surface 121 with the housing 111. The housing 111 and the scroll spring touch each other. The contact surface 121 surrounds the housing 111 in a circle. The scroll spring is arranged coaxially with the longitudinal axis L on the housing 111. The scroll spring is in particular connected to the housing 111 such that the contact surface 111 is fluid-tight. For the fluid, it is only possible the housing
111 und das Rückschlagventil 120 durch einen Zwischenraum 125 zu verlassen. Der Zwischenraum 125 entsteht zwischen den beiden Endbereichen 122 und 123, wenn der erste Endbereich 122 beabstandet von dem zweiten Endbereich 123 ist. 111 and the check valve 120 to leave through a gap 125. The gap 125 is formed between the two End portions 122 and 123, when the first end portion 122 is spaced from the second end portion 123.
Das Rückschlagventil 120 sperrt einen Fluidfluss von außerhalb in den Fluidauslass 113, wenn der erste Endbereich 122 in Kontakt mit dem zweiten Endbereich 123 ist (Figur 3) . Das Fluid drückt den ersten Endbereich 122 auf den zweiten Endbereich 123 und somit ist kein Durchströmen der Rollfeder zwischen den beiden Endbereichen 122 und 123 aus dem Hochdruckbereich A in Richtung des Niederdruckbereichs P möglich. The check valve 120 blocks fluid flow from outside into the fluid outlet 113 when the first end portion 122 is in contact with the second end portion 123 (FIG. 3). The fluid pushes the first end portion 122 on the second end portion 123 and thus no flow of the scroll spring between the two end portions 122 and 123 from the high-pressure region A in the direction of the low-pressure region P is possible.
In Betrieb gibt das Rückschlagventil 120 den Fluidfluss von dem Fluideinlass 112 zu dem Fluidauslass 113 und weiter zu der stromabwärts angeordneten Pumpe frei, wenn der Druck auf der dem Volumenstromsteuerventil 110 zugewandten Seite des Rückschlagventils 120 größer ist als der Druck auf der dem Volumenstromsteuerventil 110 abgewandten Seite des Rückschlagventils 120. Der erste Endbereich 122 wird von dem zweiten Endbereich 123 durch das Fluid, das aus dem Fluidauslass 113 strömt, abgedrückt (Figur 2) . Das Fluid strömt durch den dabei entstandenen Zwischenraum 125 zwischen dem ersten Endbereich 122 und dem zweiten Endbereich 123. Das Fluid fließt aus einem Niederdruckbereich P durch das Volumenstromsteuerventil 110 und das Rückschlagventil 120 zu einem Hochdruckbereich A. In operation, the check valve 120 releases fluid flow from the fluid inlet 112 to the fluid outlet 113 and on to the downstream pump when the pressure on the flow control valve 110 side of the check valve 120 is greater than the pressure on the flow control valve 110 side away of the check valve 120. The first end portion 122 is depressed from the second end portion 123 by the fluid flowing out of the fluid outlet 113 (Figure 2). The fluid flows through the resulting gap 125 between the first end portion 122 and the second end portion 123. The fluid flows from a low pressure region P through the volume flow control valve 110 and the check valve 120 to a high pressure region A.
Bei Druckspitzen aus dem Hochdruckbereich A des Einspritzsystems wird das Rückschlagventil 120 zusammengepresst, so dass der Fluiddruck, der von außen auf das Rückschlagventil 120 einwirkt, größer ist als der Fluiddruck im Fluidauslass 113 (Figur 3) . Der Endbereich 122 wird in Richtung des Endbereich 123 gedrückt und gelangt in Kontakt mit dem Endbereich 123. Die beiden Endbereiche 122 und 123 werden zusammengepresst und dichten somit das Rückschlagventil 120 ab, so dass die Druckspitzen nicht in das Innere des Volumenstromsteuerventils 110 gelangen können. Durch die Ventilanordnung 100 mit dem Volumenstromsteuerventil 110 und dem Rückschlagventil 120, das als Rollfeder ausgebildet ist, wird das Steuerverhalten des Volumenstromsteuerventils 110 verbessert, da die Druckspitzen aus dem Hochdruckbereich der Pumpe nicht ins Innere des Volumenstromsteuerventils 110 beziehungsweise ins Innere des Gehäuses 111 gelangen. Eine Kraft auf den Ventilstößel 114 durch die Druckspitzen, die eine Bewegung des Ventilstößels 114 zur Folge hat, wird vermieden. Dadurch ist eine präzise und zuverlässige Steuerung möglich. When pressure peaks from the high pressure area A of the injection system, the check valve 120 is compressed, so that the fluid pressure acting on the check valve 120 from the outside, is greater than the fluid pressure in the fluid outlet 113 (Figure 3). The end portion 122 is pressed toward the end portion 123 and comes into contact with the end portion 123. The two end portions 122 and 123 are compressed and thus seal the check valve 120, so that the pressure peaks can not enter the inside of the flow control valve 110. By the valve arrangement 100 with the volume flow control valve 110 and the check valve 120, which is designed as a scroll spring, the control behavior of the volume flow control valve 110 is improved because the pressure peaks from the high pressure region of the pump do not enter the interior of the volume flow control valve 110 or into the interior of the housing 111. A force on the valve stem 114 by the pressure peaks, which has a movement of the valve stem 114 result is avoided. This allows precise and reliable control.
Durch das Rückschlagventil 120, das als Rollfeder ausgebildet ist, wird auf einfache und kostengünstige Weise das Volumenstromsteuerventil 110 geschützt. Da die Druckspitzen nicht in das Innere des Volumenstromsteuerventils 110 gelangen, werden die Bauteile des Volumenstromsteuerventils 110 geschützt, insbesondere die Magnetbauteile des Aktuators 117. Die Druckspitzen, die herkömmlich zu einer schnellen und unkontrollierten Bewegung beispielsweise des Ventilstößels 114 führen, werden gedämpft beziehungsweise vollkommen abgeblockt und somit die Bauteile des Volumenstromsteuerventils 110 gegen ein Bersten geschützt. Insbesondere wird der Magnet des Aktuators 117 geschützt, da die Druckspitzen nicht im Inneren des Magneten wirken. Somit ist ein zuverlässiger Betrieb möglich. By the check valve 120, which is designed as a scroll spring, the volume flow control valve 110 is protected in a simple and cost-effective manner. Since the pressure peaks do not reach the interior of the volume flow control valve 110, the components of the volume flow control valve 110 are protected, in particular the magnetic components of the actuator 117. The pressure peaks, which conventionally lead to a rapid and uncontrolled movement, for example, the valve stem 114 are damped or completely blocked and Thus, the components of the flow control valve 110 protected against bursting. In particular, the magnet of the actuator 117 is protected because the pressure peaks do not act inside the magnet. Thus, reliable operation is possible.
Weiterhin ist es möglich die Magnetbauteile des Aktuators 117 kleiner zu dimensionieren und die FedervorSpannung der Feder 116 zu reduzieren im Vergleich zu herkömmlichen Volumenstromsteuerventilen 110 ohne das Rückschlagventil 120. Da die Vorspannung des Ventilstößels 114 zwischen dem Aktuator 117 und der Feder 116 keine Pulsation durch Druckspitzen mehr ausgleichen muss, ist die Feder auch bei einer reduzierten FedervorSpannung und kleiner dimensionierten Magnetbauteilen stabil zwischen der Feder 116 und dem Aktuator 117 angeordnet. Das Volumenstromsteuerventil 110 ist in den dargestellten Ausführungsformen als Sitzventil ausgebildet. Das Volumen¬ stromsteuerventil 110 ist gemäß weiteren Ausführungsformen in einer anderen Bauweise ausgebildet, beispielsweise in einer Schiebebauweise ausgeführt, die eine Druckkompensation auf¬ weist. Das Rückschlagventil 120 dient bei derartigen Ausfüh¬ rungsformen in erster Linie zum Schutz der Magnetbauteile des Volumenstromsteuerventils . Furthermore, it is possible to make the magnet components of the actuator 117 smaller and reduce the spring bias of the spring 116 compared to conventional volumetric flow control valves 110 without the check valve 120. Since the bias of the valve stem 114 between the actuator 117 and the spring 116 no longer pulsation by pressure peaks must balance, the spring is arranged stably between the spring 116 and the actuator 117 even at a reduced FedervorSpannung and smaller sized magnetic components. The volume flow control valve 110 is formed in the illustrated embodiments as a seat valve. The volume ¬ flow control valve 110 is formed according to other embodiments in a different construction, for example, executed in a sliding construction, which has a pressure compensation ¬ . The check valve 120 is used in such Ausfüh ¬ insurance forms primarily to protect the magnetic components of the flow control valve.

Claims

Patentansprüche claims
1. Ventilanordnung, umfassend: A valve assembly comprising:
- ein Volumenstromsteuerventil (110), das ausgebildet ist zum Einstellen eines Fluidzuflus ses in eine Pumpe,  a volumetric flow control valve (110), which is designed to set a fluid inflow into a pump,
- ein Rückschlagventil (120), das stromabwärts des Volumenstromsteuerventils (110) mit dem Volumenstromsteuerventil (110) gekoppelt ist und das als Rollfeder ausgebildet ist.  - A check valve (120) which is downstream of the flow control valve (110) coupled to the flow control valve (110) and which is designed as a scroll spring.
2. Ventilanordnung nach Anspruch 1, bei der das Volumenstromsteuerventil (110) ein Gehäuse (111) mit einer Längsachse (L) aufweist, das einen Fluideinlass (112) und einen Fluidauslass (113) umgibt, wobei die Rollfeder das Gehäuse (111) koaxial zur Längsachse (L) im Bereich des Fluidauslasses (113) umgibt. The valve assembly of claim 1, wherein the flow control valve (110) includes a housing (111) having a longitudinal axis (L) surrounding a fluid inlet (112) and a fluid outlet (113), the scroll spring coaxial with the housing (111) to the longitudinal axis (L) in the region of the fluid outlet (113) surrounds.
3. Ventilanordnung nach Anspruch 2, bei der der Fluidauslass (113) guer zur Längsachse (L) ausgerichtet ist. A valve assembly according to claim 2, wherein the fluid outlet (113) is aligned with the longitudinal axis (L).
4. Ventilanordnung nach Anspruch 2 oder 3, bei der die Rollfeder eine Kontaktfläche (121) mit dem Gehäuse (111) aufweist. 4. Valve arrangement according to claim 2 or 3, wherein the scroll spring has a contact surface (121) with the housing (111).
5. Ventilanordnung nach einem der Ansprüche 1 bis 4, bei der die Rollfeder einen ersten (122) und einen zweiten (123) Endbereich aufweist, wobei der erste Endbereich (122) so angeordnet ist, dass der erste Endbereich (122) den zweiten Endbereich (123) überlappt, und einen Mittelbereich (124), der zwischen dem ersten (122) und dem zweiten (123) Endbereich angeordnet ist und der einlagig ausgebildet ist. 5. A valve assembly according to any one of claims 1 to 4, wherein the scroll spring has a first (122) and a second (123) end portion, wherein the first end portion (122) is arranged so that the first end portion (122) the second end portion (123) overlaps, and a central region (124) which is arranged between the first (122) and the second (123) end region and which is formed in one layer.
6. Ventilanordnung nach Anspruch 5, bei der der Mittelbereich (124) einen größeren Anteil an der Rollfeder hat als die überlappenden Endbereiche (122, 123). 6. Valve arrangement according to claim 5, wherein the central region (124) has a greater proportion of the scroll spring than the overlapping end portions (122, 123).
7. Ventilanordnung nach einem der Ansprüche 1 bis 6, bei der die Rollfeder aus einem spiralförmigen Blech ausgebildet ist. 7. Valve arrangement according to one of claims 1 to 6, wherein the scroll spring is formed from a spiral-shaped sheet metal.
PCT/EP2012/074152 2011-12-02 2012-11-30 Valve arrangement WO2013079693A1 (en)

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