WO2019052717A1 - Metering device for controlling a gaseous medium - Google Patents

Metering device for controlling a gaseous medium Download PDF

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Publication number
WO2019052717A1
WO2019052717A1 PCT/EP2018/069263 EP2018069263W WO2019052717A1 WO 2019052717 A1 WO2019052717 A1 WO 2019052717A1 EP 2018069263 W EP2018069263 W EP 2018069263W WO 2019052717 A1 WO2019052717 A1 WO 2019052717A1
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WO
WIPO (PCT)
Prior art keywords
metering device
sealing element
elastic sealing
armature
thermal expansion
Prior art date
Application number
PCT/EP2018/069263
Other languages
German (de)
French (fr)
Inventor
Jochen Wessner
Martin Katz
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to CN201880059499.XA priority Critical patent/CN111094816B/en
Priority to JP2020513913A priority patent/JP6902674B2/en
Publication of WO2019052717A1 publication Critical patent/WO2019052717A1/en

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Classifications

    • 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
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • 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
    • F16K25/00—Details relating to contact between valve members and seats
    • F16K25/005—Particular materials for seats or closure elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04201—Reactant storage and supply, e.g. means for feeding, pipes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • the invention relates to a metering device for controlling a gaseous medium, in particular hydrogen, for example for use in vehicles with fuel cell drive.
  • DE 10 2012 204 565 AI describes a metering device, designed here as a proportional valve, for controlling a gaseous medium, in particular hydrogen, wherein the proportional valve comprises a nozzle body, a closing element and an elastic sealing element.
  • the proportional valve comprises a nozzle body, a closing element and an elastic sealing element.
  • the nozzle body In the nozzle body, at least one passage opening is formed, which can be released or closed by the closing element on a valve seat.
  • the elastic sealing element seals on the valve seat.
  • the temperature changes occurring in the metering device have an influence on the deformation of the elastic sealing element.
  • the opening process of the metering device can be impaired, since the lifting movement of the closing element can no longer be set precisely.
  • the metering device according to the invention for controlling a gaseous medium, in particular hydrogen has the advantage in this respect that, despite the temperature dependence of the elastic sealing element, optimum functioning of the metering device is achieved.
  • the metering device for controlling a gaseous medium, in particular hydrogen a valve housing, in which an interior space is formed.
  • an elastic sealing element In the interior of a liftable armature is arranged with an elastic sealing element, which cooperates for opening or closing at least one passage opening with a valve seat.
  • a frame element is arranged and fixedly connected to the armature, wherein the elastic sealing element is received in a recess of the frame element so that the thermal expansion of the elastic sealing element and the thermal expansion of the frame element are equal at a contact surface Frame member in the radial direction with respect to a
  • Longitudinal axis of the metering device has a higher coefficient of thermal expansion than in the axial direction with respect to the longitudinal axis of the metering device.
  • a reduction of the axial extent of the elastic sealing element is achieved by superposition of the thermal axial and radial expansion, so that no change takes place in the stroke direction of the elastic sealing element.
  • a precise adjustment of the opening stroke of the metering device is possible, whereby an appropriate adjustment of gaseous medium is ensured in an anode region of a fuel cell.
  • the frame element is made of a carbon fiber reinforced plastic.
  • the elastic sealing element can be accommodated in the frame element in a simple manner and adapted to the thermal expansion of the frame element at the contact surface.
  • the armature can be moved by means of an electromagnet and is subjected to force by means of a closing spring in the direction of the valve seat.
  • the Closing spring disposed between the valve housing and the armature and received in a recess of the electromagnet.
  • the closing spring can be arranged in a simple constructive manner in the metering device.
  • valve seat is formed on a survey of the valve housing as a flat seat.
  • valve housing in the valve housing, a passage channel is formed, through which the interior is filled with gaseous medium.
  • the metering device described is preferably suitable in a fuel cell arrangement for controlling a hydrogen supply to an anode region of a fuel cell. Advantages are the low pressure fluctuations in the anode path and a quiet operation.
  • FIG. 1 shows an embodiment of a metering device according to the invention with a frame member in longitudinal section
  • Fig. 2 shows the frame member of FIG. 1 in cross section, with only the
  • Fig.l shows an embodiment of the metering device 1 according to the invention in longitudinal section.
  • the metering device 2 has a valve housing 2, in which an interior space 18 is formed.
  • an electromagnet 50 is arranged, which comprises a magnetic coil 5 with a magnetic coil housing 6 and a magnetic core 7.
  • a hubbewegaji anchor 10 is disposed in the interior 18, on which a frame member 11 is arranged and fixedly connected thereto.
  • an elastic sealing element 12 is arranged in a recess 27.
  • the elastic sealing element 12 cooperates with a valve seat 14 for opening and closing a passage opening 3.
  • the sealing seat 14 is formed as a flat seat on a survey 16 of the valve housing 2.
  • a passage 4 is formed in the valve housing 2, whereby the interior 18 of the metering device 1 with gaseous medium, for example hydrogen, can be filled. Via the passage opening 3, the gaseous medium can emerge from the dosing device 1 in the direction of an anode region of a fuel cell arrangement.
  • gaseous medium for example hydrogen
  • a closing spring 8 is arranged, the force applied to the armature 10 in the direction of the valve seat 14, so that the elastic sealing element 12 is pressed in a closed position of the metering device 1 against the valve seat 14 ,
  • the armature 10 may be guided, for example, via the valve housing 2 in the metering device 1, so that tilting with respect to the sealing seat 14 are minimized.
  • the operation of the dosing device 1 is as follows:
  • the elastic sealing element 12 When the solenoid 5 is not energized, the elastic sealing element 12 is pressed against the valve seat 14 via the closing spring 8, so that no gaseous medium from the metering device 1 takes place in the direction of the passage opening 3. If the magnetic coil 5 is energized, then a magnetic force is generated on the armature 10, which is opposite to the closing force of the closing spring 8 and overcompensated. The elastic sealing element 12 lifts off from the valve seat 14. A gas flow through the metering device 1 is released.
  • the stroke of the armature 10 can be adjusted via the height of the current at the magnetic coil 5. The higher the current at the magnetic coil 5, the greater the stroke of the armature 10 and the higher the gas flow in the metering device 1, since the force of the closing spring 8 is stroke-dependent. Will the
  • Amperage reduced at the magnetic coil 5, and the stroke of the armature 10 is reduced and thus throttled the gas flow.
  • FIG. 2 shows the frame element 11 from the embodiment of the metering device 1 according to the invention Fig .l in cross section, wherein only the right half is shown.
  • the elastic sealing element 12 is arranged in the recess 27 of the frame element 11. In this case, the elastic sealing element 12 is connected to a contact surface 30 fixed to the frame member 11.
  • the frame member 11 further has in a radial direction 20 a higher coefficient of thermal expansion than in an axial direction 21 to the longitudinal axis 15 of the metering device 1.
  • elastic sealing element 12 has the same thermal expansion in a radial direction 24 as the frame element 11. If the elastic sealing element 12 nevertheless has a higher coefficient of thermal expansion in an axial direction 25 than in the radial direction 24 with respect to the longitudinal axis 15 of the dosing device 1, the contact surface 30 will and the resulting superposition of the thermal axial and radial expansion of the elastic sealing element 12 causes a reduction in the thermal expansion of the elastic sealing element 12 in the axial direction 25 with respect to the longitudinal axis 15.
  • the metering device 1 can be used, for example, in a fuel cell arrangement.
  • hydrogen can be supplied from a tank to an anode region of the fuel cell.
  • a flow cross-section of the passage opening 3 is changed such that a demand-oriented adjustment of the gas flow supplied to the fuel cell takes place continuously.
  • the metering device 1 for controlling a gaseous medium thus has the advantage that in this case the supply of the first gaseous medium and the metered addition of hydrogen into the anode region of the fuel cell by means of electronically controlled adjustment of the flow cross section of the passage opening 3 can be done much more precisely with simultaneous control of the anode pressure , As a result, the reliability and durability of the connected fuel cell are significantly improved, since hydrogen is always supplied in a superstoichiometric proportion. In addition, consequential damage, such as damage to a downstream catalyst can be prevented.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Sustainable Development (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Magnetically Actuated Valves (AREA)
  • Fuel Cell (AREA)
  • Lift Valve (AREA)

Abstract

The invention relates to a metering device (1) for controlling a gaseous medium, in particular hydrogen, comprising a valve housing (2), in which an inner chamber (18) is formed. A reciprocatingly movable armature (10) having an elastic sealing element (12) is arranged in the inner chamber (18), wherein said sealing element interacts with a valve seat (14) for opening or closing at least one passage opening (3). Furthermore, a frame element (11) is arranged on the armature (10) and is connected fixedly thereto, wherein the elastic sealing element (12) is received in a recess (27) of the frame element (11) so that the thermal expansion of the elastic sealing element (12) and the thermal expansion of the frame element (11) are equal at a contact surface (30). The frame element (11) has a higher coefficient of thermal expansion in the radial direction (20) with respect to a longitudinal axis (15) of the metering device (1) than in the axial direction (21) with respect to the longitudinal axis (15) of the metering device (1).

Description

Beschreibung  description
Dosiervorrichtung zum Steuern eines gasförmigen Mediums Dosing device for controlling a gaseous medium
Die Erfindung betrifft eine Dosiervorrichtung zum Steuern eines gasförmigen Mediums, insbesondere Wasserstoff, beispielsweise zur Anwendung in Fahrzeugen mit Brennstoffzellenantrieb. The invention relates to a metering device for controlling a gaseous medium, in particular hydrogen, for example for use in vehicles with fuel cell drive.
Stand der Technik State of the art
Die DE 10 2012 204 565 AI beschreibt eine Dosiervorrichtung, hier als Proportionalventil ausgebildet, zum Steuern eines gasförmigen Mediums, insbesondere Wasserstoff, wobei das Proportionalventil einen Düsenkörper, ein Schließelement und ein elastisches Dichtelement umfasst. In dem Düsenkörper ist wenigstens eine Durchlassöffnung ausgebildet, welche durch das Schließelement an einem Ventilsitz freigegeben oder verschlossen werden kann. Das elastische Dichtelement dichtet dabei am Ventilsitz ab. DE 10 2012 204 565 AI describes a metering device, designed here as a proportional valve, for controlling a gaseous medium, in particular hydrogen, wherein the proportional valve comprises a nozzle body, a closing element and an elastic sealing element. In the nozzle body, at least one passage opening is formed, which can be released or closed by the closing element on a valve seat. The elastic sealing element seals on the valve seat.
Die in der Dosiervorrichtung auftretenden Temperaturänderungen haben jedoch Einfluss auf die Verformung des elastischen Dichtelements. Dadurch kann der Öffnungsvorgang der Dosiervorrichtung beeinträchtigt werden, da die Hubbewegung des Schließelements nicht mehr präzise eingestellt werden kann. However, the temperature changes occurring in the metering device have an influence on the deformation of the elastic sealing element. As a result, the opening process of the metering device can be impaired, since the lifting movement of the closing element can no longer be set precisely.
Vorteile der Erfindung Advantages of the invention
Die erfindungsgemäße Dosiervorrichtung zum Steuern eines gasförmigen Mediums, insbesondere Wasserstoff, weist diesbezüglich den Vorteil auf, dass trotz der Temperaturabhängigkeit des elastischen Dichtelements eine optimale Funktionsweise der Dosiervorrichtung erzielt wird. Dazu weist die Dosiervorrichtung zum Steuern eines gasförmigen Mediums, insbesondere Wasserstoff, ein Ventilgehäuse auf, in welchem ein Innenraum ausgebildet ist. In dem Innenraum ist ein hubbeweglicher Anker mit einem elastischen Dichtelement angeordnet, das zum Öffnen oder Schließen mindestens einer Durchlassöffnung mit einem Ventilsitz zusammenwirkt. Weiterhin ist an dem Anker ein Rahmenelement angeordnet und mit diesem fest verbunden, wobei das elastische Dichtelement in einer Ausnehmung des Rahmenelements so aufgenommen ist, dass die thermische Ausdehnung des elastischen Dichtelements und die thermische Ausdehnung des Rahmenelements an einer Berührungsflä- che gleich sind, wobei das Rahmenelement in radialer Richtung bezüglich einerThe metering device according to the invention for controlling a gaseous medium, in particular hydrogen, has the advantage in this respect that, despite the temperature dependence of the elastic sealing element, optimum functioning of the metering device is achieved. For this purpose, the metering device for controlling a gaseous medium, in particular hydrogen, a valve housing, in which an interior space is formed. In the interior of a liftable armature is arranged with an elastic sealing element, which cooperates for opening or closing at least one passage opening with a valve seat. Furthermore, a frame element is arranged and fixedly connected to the armature, wherein the elastic sealing element is received in a recess of the frame element so that the thermal expansion of the elastic sealing element and the thermal expansion of the frame element are equal at a contact surface Frame member in the radial direction with respect to a
Längsachse der Dosiervorrichtung einen höheren Wärmeausdehnungskoeffizienten aufweist als in axialer Richtung bezüglich der Längsachse der Dosiervorrichtung. Dadurch wird durch Überlagerung der thermischen axialen und radialen Ausdehnung eine Verringerung der axialen Ausdehnung des elastischen Dichtelements erzielt, so dass keine Veränderung in Hubrichtung des elastischen Dichtelements erfolgt. So ist trotz thermischer Ausdehnung des elastischen Dichtelements eine präzise Einstellung des Öffnungshubs der Dosiervorrichtung möglich, wodurch eine bedarfsgerechte Einstellung an gasförmigem Medium in einen Anodenbereich einer Brennstoffzelle gewährleistet ist. Longitudinal axis of the metering device has a higher coefficient of thermal expansion than in the axial direction with respect to the longitudinal axis of the metering device. As a result, a reduction of the axial extent of the elastic sealing element is achieved by superposition of the thermal axial and radial expansion, so that no change takes place in the stroke direction of the elastic sealing element. Thus, despite thermal expansion of the elastic sealing element, a precise adjustment of the opening stroke of the metering device is possible, whereby an appropriate adjustment of gaseous medium is ensured in an anode region of a fuel cell.
In erster vorteilhafter Weiterbildung ist es vorgesehen, dass das Rahmenelement aus einem kohlefaserverstärktem Kunststoff hergestellt ist. Dadurch kann das elastische Dichtelement in einfacher Weise in dem Rahmenelement aufgenommen und an der Berührungsfläche an die thermische Ausdehnung des Rahmenelements angepasst werden. In a first advantageous embodiment, it is provided that the frame element is made of a carbon fiber reinforced plastic. As a result, the elastic sealing element can be accommodated in the frame element in a simple manner and adapted to the thermal expansion of the frame element at the contact surface.
In weiterer Ausgestaltung der Erfindung ist es vorteilhaft vorgesehen, dass der Anker mittels eines Elektromagneten hubbewegbar ist und mittels einer Schließfeder in Richtung des Ventilsitzes kraftbeaufschlagt ist. Vorteilhafterweise ist die Schließfeder zwischen dem Ventilgehäuse und dem Anker angeordnet und in einer Ausnehmung des Elektromagneten aufgenommen. Dadurch kann die Schließfeder in einfacher konstruktiver Weise in der Dosiervorrichtung angeordnet werden. In a further embodiment of the invention, it is advantageously provided that the armature can be moved by means of an electromagnet and is subjected to force by means of a closing spring in the direction of the valve seat. Advantageously, the Closing spring disposed between the valve housing and the armature and received in a recess of the electromagnet. As a result, the closing spring can be arranged in a simple constructive manner in the metering device.
In vorteilhafter Weiterbildung ist der Ventilsitz an einer Erhebung des Ventilgehäuses als Flachsitz ausgebildet. Durch die Verwendung eines flachen Ventilsitzes in Kombination eines elastischen Dichtelements kann in einfacher Weise und ohne große konstruktive Veränderungen die Dichtheit der Dosiervorrichtung sichergestellt werden, so dass beispielsweise kein Wasserstoff aus der Dosiervorrichtung austreten kann. In an advantageous embodiment of the valve seat is formed on a survey of the valve housing as a flat seat. By using a flat valve seat in combination with an elastic sealing element, the tightness of the metering device can be ensured in a simple manner and without major structural changes, so that, for example, no hydrogen can escape from the metering device.
In weiterer Ausgestaltung der Erfindung ist es vorteilhaft vorgesehen, dass in dem Ventilgehäuse ein Durchlasskanal ausgebildet ist, durch welchen der Innenraum mit gasförmigem Medium befüllbar ist. In a further embodiment of the invention, it is advantageously provided that in the valve housing, a passage channel is formed, through which the interior is filled with gaseous medium.
Die beschriebene Dosiervorrichtung eignet sich vorzugsweise in einer Brennstoffzellenanordnung zum Steuern einer Wasserstoffzufuhr zu einem Anodenbereich einer Brennstoffzelle. Vorteile sind die geringen Druckschwankungen im Anodenpfad und ein leiser Betrieb. The metering device described is preferably suitable in a fuel cell arrangement for controlling a hydrogen supply to an anode region of a fuel cell. Advantages are the low pressure fluctuations in the anode path and a quiet operation.
Zeichnungen drawings
In der Zeichnung sind Ausführungsbeispiele einer erfindungsgemäßen Dosiervorrichtung zur Steuerung einer Gaszufuhr, insbesondere Wasserstoff zu einer Brennstoffzelle, dargestellt. Es zeigt in In the drawing, embodiments of a metering device according to the invention for controlling a gas supply, in particular hydrogen to a fuel cell, are shown. It shows in
Fig. 1 ein Ausführungsbeispiel einer erfindungsgemäßen Dosiervorrichtung mit einem Rahmenelement im Längsschnitt, 1 shows an embodiment of a metering device according to the invention with a frame member in longitudinal section,
Fig. 2 das Rahmenelement aus der Fig. 1 im Querschnitt, wobei nur die Fig. 2 shows the frame member of FIG. 1 in cross section, with only the
rechte Hälfte gezeigt ist. Beschreibung des Ausführungsbeispiels right half is shown. Description of the embodiment
Fig.l zeigt ein Ausführungsbeispiel der erfindungsgemäßen Dosiervorrichtung 1 im Längsschnitt. Die Dosiervorrichtung 2 weist ein Ventilgehäuse 2 auf, in dem ein Innenraum 18 ausgebildet ist. In dem Innenraum 18 ist ein Elektromagnet 50 angeordnet, der eine Magnetspule 5 mit einem Magnetspulengehäuse 6 und einen Magnetkern 7 umfasst. Fig.l shows an embodiment of the metering device 1 according to the invention in longitudinal section. The metering device 2 has a valve housing 2, in which an interior space 18 is formed. In the interior 18, an electromagnet 50 is arranged, which comprises a magnetic coil 5 with a magnetic coil housing 6 and a magnetic core 7.
Weiterhin ist in dem Innenraum 18 ein hubbeweglicher Anker 10 angeordnet, an dem ein Rahmenelement 11 angeordnet und mit diesem fest verbunden ist. In dem Rahmenelement 11 ist in einer Ausnehmung 27 ein elastisches Dichtelement 12 angeordnet. Das elastische Dichtelement 12 wirkt mit einem Ventilsitz 14 zum Öffnen und Schließen einer Durchlassöffnung 3 zusammen. Der Dichtsitz 14 ist dabei als Flachsitz an einer Erhebung 16 des Ventilgehäuses 2 ausgebildet. Furthermore, a hubbeweglicher anchor 10 is disposed in the interior 18, on which a frame member 11 is arranged and fixedly connected thereto. In the frame member 11, an elastic sealing element 12 is arranged in a recess 27. The elastic sealing element 12 cooperates with a valve seat 14 for opening and closing a passage opening 3. The sealing seat 14 is formed as a flat seat on a survey 16 of the valve housing 2.
Radial zu einer Längsachse 15 der Dosiervorrichtung 1 ist in dem Ventilgehäuse 2 ein Durchlasskanal 4 ausgebildet, wodurch der Innenraum 18 der Dosiervorrichtung 1 mit gasförmigem Medium, beispielsweise Wasserstoff, befüllbar ist. Über die Durchlassöffnung 3 kann das gasförmige Medium aus der Dosiervorrichtung 1 in Richtung einem Anodenbereich einer Brennstoffzellenanordnung austreten. Radially to a longitudinal axis 15 of the metering device 1, a passage 4 is formed in the valve housing 2, whereby the interior 18 of the metering device 1 with gaseous medium, for example hydrogen, can be filled. Via the passage opening 3, the gaseous medium can emerge from the dosing device 1 in the direction of an anode region of a fuel cell arrangement.
Zwischen dem Ventilgehäuse 2 und dem Anker 10 in einer Ausnehmung 9 des Magnetkerns 7 ist eine Schließfeder 8 angeordnet, die den Anker 10 in Richtung des Ventilsitzes 14 kraftbeaufschlagt, so dass das elastische Dichtelement 12 in einer Schließstellung der Dosiervorrichtung 1 gegen den Ventilsitz 14 gedrückt wird. Der Anker 10 kann dabei beispielsweise über das Ventilgehäuse 2 in der Dosiervorrichtung 1 geführt sein, so dass Verkippungen bezüglich des Dichtsitzes 14 minimiert sind. Between the valve housing 2 and the armature 10 in a recess 9 of the magnetic core 7, a closing spring 8 is arranged, the force applied to the armature 10 in the direction of the valve seat 14, so that the elastic sealing element 12 is pressed in a closed position of the metering device 1 against the valve seat 14 , The armature 10 may be guided, for example, via the valve housing 2 in the metering device 1, so that tilting with respect to the sealing seat 14 are minimized.
Die Funktionsweise der Dosiervorrichtung 1 ist wie folgt: The operation of the dosing device 1 is as follows:
Bei nicht bestromter Magnetspule 5 wird das elastische Dichtelement 12 über die Schließfeder 8 an den Ventilsitz 14 gedrückt, so dass kein gasförmiges Medium aus der Dosiervorrichtung 1 in Richtung der Durchlassöffnung 3 erfolgt. Wird die Magnetspule 5 bestromt, so wird eine magnetische Kraft auf den Anker 10 erzeugt, welcher der Schließkraft der Schließfeder 8 entgegengerichtet ist und diese überkompensiert. Das elastische Dichtelement 12 hebt vom Ventilsitz 14 ab. Ein Gasdurchfluss durch die Dosiervorrichtung 1 ist freigegeben. When the solenoid 5 is not energized, the elastic sealing element 12 is pressed against the valve seat 14 via the closing spring 8, so that no gaseous medium from the metering device 1 takes place in the direction of the passage opening 3. If the magnetic coil 5 is energized, then a magnetic force is generated on the armature 10, which is opposite to the closing force of the closing spring 8 and overcompensated. The elastic sealing element 12 lifts off from the valve seat 14. A gas flow through the metering device 1 is released.
Der Hub des Ankers 10 kann über die Höhe der Stromstärke an der Magnetspule 5 eingestellt werden. Je höher die Stromstärke an der Magnetspule 5, desto größer ist der Hub des Ankers 10 und desto höher ist auch der Gasdurchfluss in der Dosiervorrichtung 1, da die Kraft der Schließfeder 8 hubabhängig ist. Wird die The stroke of the armature 10 can be adjusted via the height of the current at the magnetic coil 5. The higher the current at the magnetic coil 5, the greater the stroke of the armature 10 and the higher the gas flow in the metering device 1, since the force of the closing spring 8 is stroke-dependent. Will the
Stromstärke an der Magnetspule 5 reduziert, wird auch der Hub des Ankers 10 reduziert und somit der Gasdurchfluss gedrosselt. Amperage reduced at the magnetic coil 5, and the stroke of the armature 10 is reduced and thus throttled the gas flow.
Wird der Strom an der Magnetspule 5 unterbrochen, wird die magnetische Kraft auf den Anker 10 abgebaut. Das elastische Dichtelement 12 bewegt sich in Richtung des Ventilsitzes 14 und dichtet an diesem wieder ab. Der Gasdurchfluss in der Dosiervorrichtung 1 ist unterbrochen. If the current is interrupted at the magnetic coil 5, the magnetic force is reduced to the armature 10. The elastic sealing element 12 moves in the direction of the valve seat 14 and seals at this again. The gas flow in the metering device 1 is interrupted.
In der Dosiervorrichtung 1 auftretende Temperaturänderungen führen zu thermischen Ausdehnungen an dem elastischen Dichtelement 12. Dadurch wird der Hub des Ankers 10 beeinflusst, was zu unpräzisen Hubeinstellungen führen kann. Durch den Einsatz des Rahmenelements 11, in welchem das elastische Dichtelement 12 aufgenommen ist, können diese thermischen Ausdehnungen kompensiert werden. Temperature changes occurring in the metering device 1 lead to thermal expansions on the elastic sealing element 12. As a result, the stroke of the armature 10 is influenced, which can lead to imprecise stroke settings. By using the frame member 11, in which the elastic sealing element 12 is received, these thermal expansions can be compensated.
Fig.2 zeigt das Rahmenelement 11 aus dem Ausführungsbeispiel der erfindungsgemäßen Dosiervorrichtung 1 der Fig.l im Querschnitt, wobei nur die rechte Hälfte gezeigt ist. Das elastische Dichtelement 12 ist in der Ausnehmung 27 des Rahmenelements 11 angeordnet. Dabei ist das elastische Dichtelement 12 an einer Berührungsfläche 30 fest mit dem Rahmenelement 11 verbunden. 2 shows the frame element 11 from the embodiment of the metering device 1 according to the invention Fig .l in cross section, wherein only the right half is shown. The elastic sealing element 12 is arranged in the recess 27 of the frame element 11. In this case, the elastic sealing element 12 is connected to a contact surface 30 fixed to the frame member 11.
Das Rahmenelement 11 weist weiterhin in einer radialen Richtung 20 einen höheren Wärmeausdehnungskoeffizienten auf als in einer axialen Richtung 21 zu der Längsachse 15 der Dosiervorrichtung 1. Durch die feste Verbindung des elastischen Dichtelements 12 mit dem Rahmenelement 11 über die Berührungsfläche 30 weist das elastische Dichtelement 12 in einer radialen Richtung 24 dieselbe thermische Ausdehnung auf wie das Rahmenelement 11. Weist das elastische Dichtelement 12 dennoch einen höheren Wärmeausdehnungskoeffizienten in einer axialen Richtung 25 auf als in radialer Richtung 24 bezüglich der Längsachse 15 der Dosiervorrichtung 1, wird durch die Berührungsfläche 30 und die dadurch entstehende Überlagerung der thermischen axialen und radialen Ausdehnung des elastischen Dichtelements 12 eine Verringerung der thermischen Ausdehnung des elastischen Dichtelements 12 in axialer Richtung 25 bezüglich der Längsachse 15 bewirkt. Die erfindungsgemäße Dosiervorrichtung 1 kann beispielsweise in einer Brennstoffzellenanordnung Verwendung finden. Mittels der Dosiervorrichtung 1 kann einem Anodenbereich der Brennstoffzelle Wasserstoff aus einem Tank zugeführt werden. Je nach Höhe der Stromstärke an der Magnetspule 5 der Dosiervorrichtung 1 , durch welche der Hub des elastischen Dichtelements 12 betätigt wird, wird damit ein Strömungsquerschnitt der Durchlassöffnung 3 derart verändert, dass kontinuierlich eine bedarfsgerechte Einstellung der der Brennstoffzelle zugeführten Gasströmung erfolgt. The frame member 11 further has in a radial direction 20 a higher coefficient of thermal expansion than in an axial direction 21 to the longitudinal axis 15 of the metering device 1. By the fixed connection of the elastic sealing member 12 with the frame member 11 via the contact surface 30 has elastic sealing element 12 has the same thermal expansion in a radial direction 24 as the frame element 11. If the elastic sealing element 12 nevertheless has a higher coefficient of thermal expansion in an axial direction 25 than in the radial direction 24 with respect to the longitudinal axis 15 of the dosing device 1, the contact surface 30 will and the resulting superposition of the thermal axial and radial expansion of the elastic sealing element 12 causes a reduction in the thermal expansion of the elastic sealing element 12 in the axial direction 25 with respect to the longitudinal axis 15. The metering device 1 according to the invention can be used, for example, in a fuel cell arrangement. By means of the metering device 1, hydrogen can be supplied from a tank to an anode region of the fuel cell. Depending on the magnitude of the current intensity at the magnetic coil 5 of the metering device 1, through which the stroke of the elastic sealing element 12 is actuated, a flow cross-section of the passage opening 3 is changed such that a demand-oriented adjustment of the gas flow supplied to the fuel cell takes place continuously.
Die Dosiervorrichtung 1 zum Steuern eines gasförmigen Mediums weist somit den Vorteil auf, dass hierbei die Zuführung des ersten gasförmigen Mediums und die Zudosierung von Wasserstoff in den Anodenbereich der Brennstoffzelle mittels elektronisch gesteuerten Anpassung des Strömungsquerschnitts der Durchlassöffnung 3 bei gleichzeitiger Regelung des Anodendrucks wesentlich exakter erfolgen kann. Hierdurch werden die Betriebssicherheit und Dauerhaltbarkeit der angeschlossenen Brennstoffzelle deutlich verbessert, da Wasserstoff immer in einem überstöchiometrischen Anteil zugeführt wird. Zudem können auch Folgeschäden, wie zum Beispiel Beschädigungen eines nachgeordneten Katalysators, verhindert werden. The metering device 1 for controlling a gaseous medium thus has the advantage that in this case the supply of the first gaseous medium and the metered addition of hydrogen into the anode region of the fuel cell by means of electronically controlled adjustment of the flow cross section of the passage opening 3 can be done much more precisely with simultaneous control of the anode pressure , As a result, the reliability and durability of the connected fuel cell are significantly improved, since hydrogen is always supplied in a superstoichiometric proportion. In addition, consequential damage, such as damage to a downstream catalyst can be prevented.

Claims

Ansprüche  claims
Dosiervorrichtung (1) zum Steuern eines gasförmigen Mediums, insbesondere Wasserstoff, mit einem Ventilgehäuse (2), in welchem ein Innenraum (18) ausgebildet ist, mit einem darin angeordneten hubbeweglichen Anker (10) und einem daran angeordneten elastischen Dichtelement (12), das zum Öffnen oder Schließen mindestens einer Durchlassöffnung (3) mit einem Ventilsitz (14) zusammenwirkt, dadurch gekennzeichnet, dass an dem Anker (10) ein RahmenelementDosing device (1) for controlling a gaseous medium, in particular hydrogen, with a valve housing (2) in which an interior space (18) is formed, with a liftable armature (10) arranged therein and an elastic sealing element (12) arranged thereon for opening or closing at least one passage opening (3) cooperates with a valve seat (14), characterized in that on the armature (10) has a frame element
(11) angeordnet und mit diesem fest verbunden ist, wobei das elastische Dichtelement (12) in einer Ausnehmung (27) des Rahmenelements (11) so aufgenommen ist, dass die thermische Ausdehnung des elastischen Dichtelements(11) is arranged and fixedly connected thereto, wherein the elastic sealing element (12) in a recess (27) of the frame member (11) is accommodated so that the thermal expansion of the elastic sealing element
(12) und die thermische Ausdehnung des Rahmenelements (11) an einer Berührungsfläche (30) gleich sind, wobei das Rahmenelement (11) in radialer Richtung (20) bezüglich einer Längsachse (15) der Dosiervorrichtung (1) einen höheren Wärmeausdehnungskoeffizienten aufweist als in axialer Richtung (21) bezüglich der Längsachse (15) der Dosiervorrichtung (1). (12) and the thermal expansion of the frame member (11) at a contact surface (30) are equal, wherein the frame member (11) in the radial direction (20) with respect to a longitudinal axis (15) of the metering device (1) has a higher coefficient of thermal expansion than in axial direction (21) with respect to the longitudinal axis (15) of the metering device (1).
Dosiervorrichtung (1) nach Anspruch 1, dadurch gekennzeichnet, dass das Rahmenelement aus einem kohlefaserverstärkten Kunststoff hergestellt ist. Dosing device (1) according to claim 1, characterized in that the frame element is made of a carbon fiber reinforced plastic.
Dosiervorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Anker (10) mittels eines Elektromagneten (50) hubbewegbar ist und mittels einer Schließfeder (8) in Richtung des Ventilsitzes (14) kraftbeaufschlagt ist. Dosing device (1) according to one of the preceding claims, characterized in that the armature (10) by means of an electromagnet (50) is höhenbewegbar and by means of a closing spring (8) in the direction of the valve seat (14) is subjected to force.
Dosiervorrichtung (1) nach Anspruch 3, dadurch gekennzeichnet, dass die Schließfeder (8) zwischen dem Ventilgehäuse (2) und dem Anker (10) angeordnet ist und in einer Ausnehmung (9) des Elektromagneten (50) aufgenommen ist. Dosing device (1) according to claim 3, characterized in that the closing spring (8) between the valve housing (2) and the armature (10) is arranged and in a recess (9) of the electromagnet (50) is accommodated.
Dosiervorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Ventilsitz (14) an einer Erhebung (16) des Ventilgehäuses (2) als Flachsitz ausgebildet ist. Dosing device (1) according to one of the preceding claims, characterized in that the valve seat (14) is formed on a protrusion (16) of the valve housing (2) as a flat seat.
Dosiervorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass in dem Ventilgehäuse (2) ein Durchlasskanal (4) ausgebildet ist, durch welchen der Innenraum (18) mit gasförmigem Medium befüllbar ist. Brennstoffzellenanordnung mit einer Dosiervorrichtung (1) zum Steuern einer Wasserstoffzufuhr zu einer Brennstoffzelle nach einem der vorhergehenden Ansprüche. Dosing device (1) according to one of the preceding claims, characterized in that in the valve housing (2) a passage channel (4) is formed, through which the interior space (18) can be filled with gaseous medium. Fuel cell arrangement with a metering device (1) for controlling a hydrogen supply to a fuel cell according to one of the preceding claims.
PCT/EP2018/069263 2017-09-13 2018-07-16 Metering device for controlling a gaseous medium WO2019052717A1 (en)

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JP2020513913A JP6902674B2 (en) 2017-09-13 2018-07-16 Metering device for controlling gaseous media

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JP6902674B2 (en) 2021-07-14

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