EP2954178A1 - Metering valve for additives at risk of freezing - Google Patents

Metering valve for additives at risk of freezing

Info

Publication number
EP2954178A1
EP2954178A1 EP14700175.4A EP14700175A EP2954178A1 EP 2954178 A1 EP2954178 A1 EP 2954178A1 EP 14700175 A EP14700175 A EP 14700175A EP 2954178 A1 EP2954178 A1 EP 2954178A1
Authority
EP
European Patent Office
Prior art keywords
valve
metering valve
spring
calibration
channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14700175.4A
Other languages
German (de)
French (fr)
Inventor
Gottfried Wilhelm Haesemann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
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 EP2954178A1 publication Critical patent/EP2954178A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • 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
    • 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
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • 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
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
    • F16K3/16—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with special arrangements for separating the sealing faces or for pressing them together
    • F16K3/20—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with special arrangements for separating the sealing faces or for pressing them together by movement of the seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • 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
    • F02M61/02—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 of valveless type
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a metering valve.
  • a metering valve can be used to dose a liquid from a pressurized reservoir.
  • the metering valve is particularly suitable for metering a freeze-endangered liquid additive.
  • a freezing-endangered liquid additive is, for example, urea-water solution.
  • Urea water solution is regularly used for exhaust gas purification in exhaust treatment devices in the automotive field.
  • SCR Selective Catalytic Reduction
  • the exhaust gas treatment device urea-water solution is fed as a reducing agent precursor or ammonia as a reducing agent.
  • the urea-water solution is thermolytically (by high temperatures) and / or hydrolytically (supported by a catalyst) converted to ammonia.
  • the nitrogen oxide compounds in the exhaust gas react with the ammonia to harmless substances (in particular to C02, water and nitrogen).
  • the additive is, for example, urea-water solution.
  • urea-water solution For waste gas purification, a 32.5 percent urea-water solution is available, which is available under the trade name AdBlue®. This urea-water solution freezes at -11 ° C. Such low temperatures can occur in the automotive sector, especially during long periods of downtime.
  • An SCR metering system can be designed so that the liquid additive is present in a metering valve for metering liquid additive during these standstill periods.
  • the SCR dosing system is therefore not emptied in Abstellfall.
  • the SCR dosing system must therefore be designed in such a way that it can be freezing of the reducing agent is not destroyed.
  • all components of the SCR metering system, in particular the metering valve should nevertheless be as inexpensive as possible. It is the object of the present invention to solve or at least alleviate the technical problems described in connection with the prior art.
  • a particularly advantageous metering valve is to be presented which is freeze-resistant.
  • the metering valve according to the invention has at least one valve housing with a channel and a valve body which is movable in order to open and close the metering valve and a spring which exerts a spring force on the valve body and thus keeps the valve body in a rest position, wherein the spring is supported on at least one calibrating body, the valve body, the spring and the at least one calibrating body are arranged in the channel and the at least one calibrating body is supported by a supporting component which is fastened in the valve housing with a material connection, wherein a portion the support member protrudes from the valve housing.
  • the metering valve preferably has at least one inlet through which liquid additive can enter the metering valve.
  • the metering valve preferably has at least one outlet through which liquid additive can be metered out from the metering valve.
  • a flow path preferably exists through the metering valve, which the liquid additive can follow from the inlet to the outlet and which is closable with the valve body. During operation of the metering valve, this flow path is at least partially filled with the liquid additive.
  • the valve body At rest, the valve body is preferably biased with the spring and the spring force against a stop.
  • the spring is supported against at least one calibration body.
  • the position of the calibration body is set individually to precisely adjust the spring force of the spring on the valve body.
  • the channel preferably forms, at least in sections, the flow path through the metering valve (preferably from the at least one inlet to the at least one outlet).
  • the valve housing is preferably designed as a casting, in which the channel is cast. It is also possible that the channel is drilled or milled into the valve housing.
  • the valve housing is preferably made of metal.
  • the valve housing may also consist of sheet metal parts.
  • a cohesive connection can be, for example, a soldered connection or a welded connection.
  • the materials of the calibration body, the support member and the material of the metering valve or the material of the valve housing in the region of the cohesive connection are preferably metallic.
  • the welded joint is preferably a metallic welded joint in which a metallic material of the support member and a metal material of the valve housing are fused together.
  • the welded connection is preferably produced under the action of an inert gas in order to keep oxygen away from the weld during the welding process and to ensure a particularly high quality of the welded connection.
  • Freezing liquid additive in the metering valve can generate very large forces on the components of the metering valve which adjoin the liquid additive.
  • water-based liquid additives such as urea-water solution
  • expand during freezing which can result in very high pressures.
  • the metering valve may also comprise further component parts, such as a drive unit, seals, etc.
  • a drive unit of a metering valve regularly comprises an electric drive.
  • the drive is typically capable of exerting on the valve body a force which acts to open the metering valve against the spring force.
  • the force exerted on the valve body by the drive is normally a magnetic force.
  • the valve body therefore preferably has at least a portion of metal, so that a magnetic force of the drive can act on the valve body.
  • a cohesive connection is to be integrated with relatively little technical effort in the manufacture of a metering valve, in particular when the cohesive connection is performed in addition to a press connection between the metering valve and the calibration. It has been found that it would be much more expensive to produce a more stable press connection, because this would require the entire metering valve housing should be made much more stable in order to accommodate the higher forces of the press connection permanently. It has proved to be particularly advantageous, both a press connection as well as the material connection described to be used on a support member for fixing the calibration, because then the forces for holding the calibration (even with ice pressure) are divided into two different compounds and thus ensures a secure positioning of the calibration without a more stable design of the metering can be.
  • the support component is preferably located directly on the calibration.
  • the support member extends the calibration.
  • the section of the support component is preferably designed such that the support component is supported on a valve holder for the metering valve.
  • the length with which the section projects beyond the valve housing is preferably selected accordingly.
  • the valve holder is, for example, a receptacle for the metering valve in a supply device for adding the liquid additive to an exhaust gas treatment device.
  • the extension of the support component makes it possible to realize a cohesive connection with the valve housing and / or to reduce an upstream inflow volume (cavity) and / or to provide a guide / support for the support component outside the valve housing.
  • the metering valve is also advantageous when the calibration body is sleeve-shaped and the channel has a channel portion in which the calibration can be positioned so as to adjust the spring force of the spring on the valve body.
  • the support member is preferably also sleeve-shaped and positioned in the channel section.
  • the channel is preferably cylindrically shaped in sections and preferably has a circular cross-sectional area.
  • the sleeve-shaped calibration body is preferably adapted to the cylindrical shape of the channel such that the calibration body bears against the wall of the channel, so that liquid additive does not flow between the calibration body and the wall of the channel, but a flow path for the liquid additive through the sleeve-shaped Calibration body extends therethrough.
  • the calibration body preferably has one (frontal) support portion on which the spring is supported.
  • the spring force of the spring which acts on the valve body, preferably acts on the valve body opposite the end of the spring on the calibration. The spring is clamped between the valve body and the calibration.
  • the channel portion which is preferably cylindrically shaped so that the calibration body can be positioned therein, is preferably made somewhat longer than the calibration body, so that the position of the calibration in the channel section can be varied in a range to compensate for the manufacturing tolerances of the spring described above ,
  • the metering valve is also advantageous if the valve body rests in the rest position on a closing seat, the metering valve is closed in the rest position and the valve body for opening the metering valve against the spring force of the closing seat is movable away.
  • the closing seat preferably forms the location of the metering valve or of the valve housing on which the valve body rests in the rest position.
  • the valve body and the closing seat together preferably interrupt the flow path through the metering valve from the inlet to the outlet when the valve body abuts the closing seat. In the rest position, the metering valve is preferably closed.
  • the metering valve is also advantageous if the calibration body is connected to the metering valve via a press connection.
  • the calibration body is (as already described above) preferably positioned in a channel section of a channel in the metering valve.
  • the calibration body which is preferably sleeve-shaped, is preferably deformable in the radial direction.
  • the calibration body may first be positioned in the channel portion and then expanded in the radial direction to be pressed against a wall of the channel.
  • Such deformation preferably does not alter the positioning of the calibration body in the axial direction (along the channel), which influences the spring force exerted on the spring by the calibration body.
  • the metering valve is advantageous if the metering valve has an opening through which the fluid to be metered can enter the metering valve, the calibration body and the support component continue from the spring up to the opening, and the integral connection on an outer surface the support member and is formed at the opening.
  • the support member extends not only to the opening, but with a portion still beyond the opening.
  • the described opening preferably simultaneously constitutes the inlet for the liquid additive into the metering valve.
  • the opening preferably simultaneously constitutes an inlet into the channel through the metering valve, in which the channel section is arranged, in which the calibrating body can be placed.
  • the cohesive connection is formed circumferentially on the outer surface of the support member.
  • the outer surface of the support member is at the portion of the support member which protrudes from the valve housing, for example, a welder very accessible.
  • the outer surface is in direct contact with the valve housing. Therefore, it is advantageous to produce there a (circumferential) cohesive (welding) connection.
  • a motor vehicle at least comprising an internal combustion engine, an exhaust gas treatment device for cleaning the exhaust gases of the internal combustion engine and a supply device for supplying an additive in the exhaust gas treatment device with a metering valve according to the invention.
  • FIG. 1 shows an embodiment variant of a metering valve in the closed state
  • FIG. 2 shows a detail of a metering valve
  • Fig. 3 a motor vehicle, comprising a metering valve.
  • Fig. 1 shows a metering valve 1 comprising a valve housing 6, through which a channel 7 extends.
  • a valve body 2 is arranged in the channel 7, a valve body 2 is arranged.
  • the valve body 2 is braced with a spring 3 in the metering valve 1 or in the valve housing 6 or in the channel 7.
  • the spring 3 is supported against a calibration 4.
  • the calibration body 4, the spring 3 and the valve body 2 are inserted through an opening 11 of the channel 7 into the valve housing 6.
  • the calibration 4 is located in a channel section 8 of the channel 7.
  • the spring 3 exerts on the valve body 2 a defined force, which presses the valve body 2 against a closing seat 9, and the metering valve 1 so closes.
  • the valve body 2 can be moved with a drive, not shown, against the force exerted by the spring 3 spring force to the valve body 2 away from the closing seat 9 and so release a flow path 10 through the metering valve 1 from an inlet 21 to an outlet 22 and the metering valve 1 so open.
  • the metering valve 1 or the valve housing 6 of the metering valve 1 preferably has seals 23 on an outer surface, with which the metering valve 1 can be inserted in a fluid-tight manner into a feed device, not shown, with which liquid additive can be fed into an exhaust gas treatment device. In such a feeder takes over the metering valve 1 has the task to set the supplied from the supply device amount of liquid additive.
  • the calibration body 4 is supported on a support member 13.
  • the support component 13 supports the calibration body 4.
  • the cohesive connection 5 is formed on an outer surface 12 on the support member 13 in the region of a portion 14 of the support member 13, wherein the portion 14 protrudes from the valve housing 6. As a result, the cohesive connection 5 is arranged in the vicinity of the opening 11.
  • a tool for forming the substance-coherent connection 5 therefore does not have to penetrate very deeply into the channel 7, but may remain in the vicinity of the opening 11.
  • Fig. 2 shows a detail of a metering valve. To see are a part of the support member 13 and a part of the valve housing 6
  • the support member 13 is formed sleeve-shaped and here only a section through the wall of the support member 13 is shown.
  • the fluid-tight connection 5 is formed on the outer surface 12 of the support member 13 in a portion 14 which extends out of the valve housing 6 also.
  • the substance-coherent connection 5 can be circumferentially formed along the entire outer surface 12 of the support member 13 in a line.
  • Fig. 3 shows a motor vehicle 15, comprising an internal combustion engine 16 and an exhaust gas treatment device 17 for cleaning the exhaust gases of the combustion engine 16.
  • the motor vehicle 15 also has a tank 19, in which liquid additive (for example, urea-water solution) is stored.
  • the liquid additive from the tank 19 may be delivered to a supply device 18 with a delivery unit 20 (eg, a pump).
  • a metering valve 1 is provided, with which the liquid additive of the exhaust gas treatment device 17 can be supplied.

Abstract

The invention relates to a metering valve (1), at least comprising a valve housing (6), a channel (7), a valve body (2), which can be moved in order to open and close the metering valve (1), and a spring (3), which applies a spring force to the valve body (2) and thus keeps the valve body (2) in a rest position, wherein the spring (3) is supported on at least one calibration body (4), the valve body (2), the spring (3), and the at least one calibration body (4) are arranged in the channel (7), and the at least one calibration body (4) is supported by a supporting component (13), which is fastened in the valve housing (6) by means of a material-bonding connection (5), wherein a segment (14) of the supporting component (13) protrudes from the valve housing (6).

Description

Dosierventil für einfriergefährdete Additive  Dosing valve for freeze-risk additives
Die Erfindung betrifft ein Dosierventil. Ein derartiges Dosierventil kann verwen- det werden, um eine Flüssigkeit aus einem unter Druck stehenden Speicher zu dosieren. The invention relates to a metering valve. Such a metering valve can be used to dose a liquid from a pressurized reservoir.
Das Dosierventil ist insbesondere geeignet, um ein einfriergefährdetes flüssiges Additiv zu dosieren. Ein solches einfriergefährdetes flüssiges Additiv ist bei- spielsweise Harnstoff- Wasser-Lösung. Harnstoff- Wasser-Lösung wird regelmäßig zur Abgasreinigung in Abgasbehandlungsvorrichtungen im Kraftfahrzeugbereich eingesetzt. In Kraftfahrzeugen wird in Abgasbehandlungsvorrichtungen zur Reinigung der Abgase von Verbrennungskraftmaschinen in letzter Zeit vermehrt das SCR- Verfahren [SCR=Selective Catalytic Reduction] angewendet. Bei diesem Verfahren werden Stickstoffoxidverbindungen im Abgas zu unschädlichen Substanzen reduziert. Dazu wird der Ab gasbehandlungs Vorrichtung Harnstoff- Wasser-Lösung als Reduktionsmittelvorläufer bzw. Ammoniak als Reduktionsmittel zugeführt. Die Harnstoff- Wasser-Lösung wird thermolytisch (durch hohe Temperaturen) und/oder hydrolytisch (unterstützt durch einen Katalysator) zu Ammoniak umgesetzt. Die Stickstoffoxidverbindungen im Abgas reagieren mit dem Ammoniak zu unschädlichen Substanzen (insbesondere zu C02, Wasser und Stickstoff). Das Additiv ist beispielsweise Harnstoff- Wasser-Lösung. The metering valve is particularly suitable for metering a freeze-endangered liquid additive. Such a freezing-endangered liquid additive is, for example, urea-water solution. Urea water solution is regularly used for exhaust gas purification in exhaust treatment devices in the automotive field. In motor vehicles, the SCR process [SCR = Selective Catalytic Reduction] has recently been increasingly used in exhaust gas treatment devices for cleaning the exhaust gases of internal combustion engines. In this process, nitrogen oxide compounds in the exhaust gas are reduced to harmless substances. For this purpose, the exhaust gas treatment device urea-water solution is fed as a reducing agent precursor or ammonia as a reducing agent. The urea-water solution is thermolytically (by high temperatures) and / or hydrolytically (supported by a catalyst) converted to ammonia. The nitrogen oxide compounds in the exhaust gas react with the ammonia to harmless substances (in particular to C02, water and nitrogen). The additive is, for example, urea-water solution.
Für die Abgasreinigung ist eine 32,5 prozentige Harnstoff- Wasser-Lösung ver- breitet, welche unter dem Handelsnamen AdBlue® erhältlich ist. Diese Harnstoff- Wasser- Lösung friert bei -11 °C ein. Derart niedrige Temperaturen können im Kraftfahrzeugbereich insbesondere während langer Stillstandszeiten auftreten. For waste gas purification, a 32.5 percent urea-water solution is available, which is available under the trade name AdBlue®. This urea-water solution freezes at -11 ° C. Such low temperatures can occur in the automotive sector, especially during long periods of downtime.
Ein SCR-Dosiersystem kann so ausgeführt sein, dass in einem Dosierventil zur Dosierung von flüssigem Additiv auch während dieser Stillstandszeiten das flüssige Additiv vorliegt. Das SCR-Dosiersystem wird also im Abstellfall nicht entleert. Das SCR-Dosiersystem muss daher so ausgestaltet sein, dass es durch Ein- frieren des Reduktionsmittels nicht zerstört wird. Gleichzeitig sollten gleichwohl alle Komponenten des SCR-Dosiersystems, insbesondere das Dosierventil, möglichst kostengünstig sein. Es ist Aufgabe der hier vorliegenden Erfindung, die im Zusammenhang mit dem Stand der Technik geschilderten technischen Probleme zu lösen bzw. zumindest zu lindern. Es soll insbesondere ein besonders vorteilhaftes Dosierventil vorgestellt werden, welches einfrierbeständig ist. Diese Aufgaben werden gelöst einem Dosierventil gemäß dem unabhängigen Patentanspruch 1. Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den abhängig formulierten Patentansprüchen angegeben. Die in den Patentansprüchen einzeln aufgeführten Merkmale sind in beliebiger, technologisch sinnvoller, Weise miteinander kombinierbar und können durch erläuternde Sachverhalte aus der Beschreibung ergänzt werden, wobei weitere Ausführungsvarianten der Erfindung aufgezeigt werden. An SCR metering system can be designed so that the liquid additive is present in a metering valve for metering liquid additive during these standstill periods. The SCR dosing system is therefore not emptied in Abstellfall. The SCR dosing system must therefore be designed in such a way that it can be freezing of the reducing agent is not destroyed. At the same time all components of the SCR metering system, in particular the metering valve, should nevertheless be as inexpensive as possible. It is the object of the present invention to solve or at least alleviate the technical problems described in connection with the prior art. In particular, a particularly advantageous metering valve is to be presented which is freeze-resistant. These objects are achieved by a metering valve according to the independent claim 1. Further advantageous embodiments of the invention are specified in the dependent formulated claims. The features listed individually in the claims are combinable with each other in any technologically meaningful manner and can be supplemented by explanatory facts from the description, wherein further embodiments of the invention are shown.
Das erfindungs gemäße Dosierventil weist zumindest ein Ventilgehäuse mit einem Kanal und einen Ventilkörper auf, der beweglich ist, um das Dosierventil zu öff- nen und zu schließen und eine Feder, welche eine Federkraft auf den Ventilkörper ausübt und den Ventilkörper so in einer Ruhestellung hält, wobei die Feder an mindestens einem Kalibrierkörper abgestützt ist, der Ventilkörper, die Feder und der mindestens eine Kalibrierkörper in dem Kanal angeordnet sind und der mindestens eine Kalibrierkörper von einem Abstützbauteil abgestützt ist, welches mit einer stoffschlüssigen Verbindung in dem Ventilgehäuse befestigt ist, wobei ein Abschnitt des Abstützbauteil aus dem Ventilgehäuse hervorsteht. The metering valve according to the invention has at least one valve housing with a channel and a valve body which is movable in order to open and close the metering valve and a spring which exerts a spring force on the valve body and thus keeps the valve body in a rest position, wherein the spring is supported on at least one calibrating body, the valve body, the spring and the at least one calibrating body are arranged in the channel and the at least one calibrating body is supported by a supporting component which is fastened in the valve housing with a material connection, wherein a portion the support member protrudes from the valve housing.
Das Dosierventil weist vorzugsweise zumindest einen Einlass auf, durch welchen flüssiges Additiv in das Dosierventil gelangen kann. Außerdem weist das Dosier- ventil vorzugsweise mindestens einen Auslass auf, durch welchen flüssiges Additiv von dem Dosierventil dosiert abgegeben werden kann. Von dem Einlass zu dem Auslass existiert durch das Dosierventil vorzugsweise ein Strömungsweg, welchem das flüssige Additiv von dem Einlass zu dem Auslass folgen kann und welcher mit dem Ventilkörper verschließbar ist. Dieser Strömungsweg ist im Betrieb des Dosierventils zumindest teilweise mit dem flüssigen Additiv gefüllt. Wenn der Strömungsweg von dem Einlass zu dem Auslass freigegeben werden soll, wird der Ventilkörper bewegt, um das Dosierventil zu öffnen. Der Ventilkörper wird von der Feder in einer Ruhestellung gehalten, indem die Feder auf den Ventilkörper eine Federkraft ausübt. In Ruhestellung ist der Ventilkörper vorzugsweise mit der Feder und der Federkraft gegen einen Anschlag vorgespannt. Die Feder ist gegen mindestens einen Kalibrierkörper abgestützt. Bei der Montage des Dosierventils wird die Position des Kalibrierkörpers individuell festgelegt, um die Federkraft der Feder auf den Ventilkörper genau einzustellen. The metering valve preferably has at least one inlet through which liquid additive can enter the metering valve. In addition, the metering valve preferably has at least one outlet through which liquid additive can be metered out from the metering valve. From the inlet to the outlet, a flow path preferably exists through the metering valve, which the liquid additive can follow from the inlet to the outlet and which is closable with the valve body. During operation of the metering valve, this flow path is at least partially filled with the liquid additive. When the flow path from the inlet to the outlet is to be released, the valve body is moved to open the metering valve. The valve body is held by the spring in a rest position by the spring exerts a spring force on the valve body. At rest, the valve body is preferably biased with the spring and the spring force against a stop. The spring is supported against at least one calibration body. When installing the metering valve, the position of the calibration body is set individually to precisely adjust the spring force of the spring on the valve body.
Der Kanal bildet vorzugsweise zumindest abschnittsweise den Strömungsweg durch das Dosierventil (vorzugsweise von dem zumindest einen Einlass zu dem zumindest einen Auslass) aus. Das Ventilgehäuse ist vorzugsweise als Gussteil ausgeführt, in welches der Kanal eingegossen ist. Es ist auch möglich, dass der Kanal in das Ventilgehäuse hineingebohrt oder hineingefräst ist. Das Ventilgehäuse ist vorzugsweise aus Metall. Das Ventilgehäuse kann auch aus Blechteilen bestehen. Eine stoffschlüssige Verbindung kann beispielsweise eine Lötverbindung oder eine Schweißverbindung sein. The channel preferably forms, at least in sections, the flow path through the metering valve (preferably from the at least one inlet to the at least one outlet). The valve housing is preferably designed as a casting, in which the channel is cast. It is also possible that the channel is drilled or milled into the valve housing. The valve housing is preferably made of metal. The valve housing may also consist of sheet metal parts. A cohesive connection can be, for example, a soldered connection or a welded connection.
Die Materialen des Kalibrierkörpers, des Abstützbauteils und das Material des Dosierventils bzw. das Material des Ventilgehäuses im Bereich der stoffschlüssigen Verbindung sind vorzugsweise metallisch. Die Schweißverbindung ist vor- zugsweise eine metallische Schweißverbindung, bei der ein metallisches Material des Abstützbauteils und ein metallisches Material des Ventilgehäuses miteinander verschmolzen sind. Die Schweißverbindung wird vorzugsweise unter der Einwirkung eines Schutzgases hergestellt, um während des Schweißvorgangs Sauerstoff von der Schweißstelle fern zu halten und eine besonders hohe Qualität der Schweißverbindung zu gewährleisten. Einfrierendes, flüssiges Additiv in dem Dosierventil kann auf die Komponenten des Dosierventils, welche an das flüssige Additiv angrenzen, sehr große Kräfte erzeugen. Insbesondere wasserbasierte flüssige Additive (wie beispielsweise Harnstoff-Wasser-Lösung) dehnen sich beim Einfrieren aus, wodurch sehr hohe Drücke entstehen können. Es hat sich heraus gestellt, dass die Kalibrierhülse mit Hilfe einer stoffschlüssigen Verbindung an einem Abstützbauteil in dem Ventilgehäuse so befestigt werden kann, dass keine dauerhafte Verschiebung oder Verformung der Kalibrierhülse durch auftretenden Eisdruck auftritt. Damit wird auch die von der Feder auf den Ventilkörper ausgeübte Federkraft nicht dauerhaft ver- ändert. The materials of the calibration body, the support member and the material of the metering valve or the material of the valve housing in the region of the cohesive connection are preferably metallic. The welded joint is preferably a metallic welded joint in which a metallic material of the support member and a metal material of the valve housing are fused together. The welded connection is preferably produced under the action of an inert gas in order to keep oxygen away from the weld during the welding process and to ensure a particularly high quality of the welded connection. Freezing liquid additive in the metering valve can generate very large forces on the components of the metering valve which adjoin the liquid additive. In particular, water-based liquid additives (such as urea-water solution) expand during freezing, which can result in very high pressures. It has been found that the calibration by means of a material connection to a support member in the valve housing can be fixed so that no permanent displacement or deformation of the Kalibrierhülse occurs by ice pressure occurring. Thus, the spring force exerted on the valve body by the spring is not permanently changed.
Das Dosierventil kann außer dem Ventilkörper, der Feder und dem Kalibrierkörper noch weitere Bauteileile umfassen, wie beispielsweise eine Antriebseinheit, Dichtungen, usw. Eine Antriebseinheit eines Dosierventils umfasst regelmäßig einen elektrischen Antrieb. Der Antrieb ist typischerweise in der Lage, auf den Ventilkörper eine Kraft auszuüben, welche zum Öffnen des Dosierventils gegen die Federkraft wirkt. Wenn die vom Antrieb auf den Ventilkörper ausgeübte Kraft die Federkraft übersteigt, bewegt sich der Ventilkörper und das Dosierventil öffnet. Der Ventilkörper gibt dann den Strömungsweg von dem zumindest einen Ein- lass zu dem zumindest einen Auslass des Dosierventils frei. Die von dem Antrieb auf den Ventilkörper ausgeübte Kraft ist normalerweise eine magnetische Kraft. Der Ventilkörper weist daher vorzugsweise zumindest einen Abschnitt aus Metall auf, damit eine magnetische Kraft des Antriebs auf den Ventilkörper wirken kann. Eine stoffschlüssige Verbindung ist mit verhältnismäßig geringem technischen Aufwand in die Fertigung eines Dosierventils zu integrieren, insbesondere wenn die stoffschlüssige Verbindung zusätzlich zu einer Pressverbindung zwischen dem Dosierventil und dem Kalibrierkörper ausgeführt wird. Es hat sich heraus gestellt, dass es wesentlich aufwändiger wäre eine stabilere Pressverbindung herzustellen, weil hierzu das gesamte Dosierventilgehäuse wesentlich stabiler ausgeführt sein müsste, um die höheren Kräfte der Pressverbindung dauerhaft aufnehmen zu können. Es hat sich als besonders vorteilhaft erwiesen, sowohl eine Pressverbindung als auch die beschriebene stoffschlüssige Verbindung an einem Abstützbauteil zur Fixierung des Kalibrierkörpers zu verwenden, weil dann die Kräfte zum Halten des Kalibrierkörpers (auch bei Eisdruck) auf zwei verschiedene Verbindungen aufgeteilt werden und so auch ohne eine stabilere Ausführung des Dosierventils eine sichere Positionierung des Kalibrierkörpers gewährleistet werden kann. In addition to the valve body, the spring and the calibration body, the metering valve may also comprise further component parts, such as a drive unit, seals, etc. A drive unit of a metering valve regularly comprises an electric drive. The drive is typically capable of exerting on the valve body a force which acts to open the metering valve against the spring force. When the force applied to the valve body by the actuator exceeds the spring force, the valve body moves and the metering valve opens. The valve body then releases the flow path from the at least one inlet to the at least one outlet of the metering valve. The force exerted on the valve body by the drive is normally a magnetic force. The valve body therefore preferably has at least a portion of metal, so that a magnetic force of the drive can act on the valve body. A cohesive connection is to be integrated with relatively little technical effort in the manufacture of a metering valve, in particular when the cohesive connection is performed in addition to a press connection between the metering valve and the calibration. It has been found that it would be much more expensive to produce a more stable press connection, because this would require the entire metering valve housing should be made much more stable in order to accommodate the higher forces of the press connection permanently. It has proved to be particularly advantageous, both a press connection as well as the material connection described to be used on a support member for fixing the calibration, because then the forces for holding the calibration (even with ice pressure) are divided into two different compounds and thus ensures a secure positioning of the calibration without a more stable design of the metering can be.
Das Abstützbauteil liegt vorzugsweise unmittelbar an dem Kalibrierkörper an. Das Abstützbauteil verlängert den Kalibrierkörper. Der Abschnitt des Abstützbauteils ist vorzugsweise so ausgebildet, dass das Abstützbauteil sich an einer Ventil- halterung für das Dosierventil abstützt. Die Länge, mit der der Abschnitt über das Ventilgehäuse übersteht, ist vorzugsweise entsprechend gewählt. So kann die Kraft zum Halten des Kalibrierkörpers noch weiter erhöht werden. Die Ventilhal- terung ist beispielsweise eine Aufnahme für das Dosierventil in einer Zufuhrvorrichtung zur Zugabe des flüssigen Additivs zu einer Abgasbehandlungsvorrich- tung. Die Verlängerung des Abstützbauteils ermöglicht insbesondere, dort eine stoffschlüssige Verbindung mit dem Ventilgehäuse zu realisieren und/oder ein vorgelagertes Einströmvolumen (Hohlraum) zu reduzieren und/oder eine Führung/Lagerung für das Abstützbauteil außerhalb des Ventilgehäuses vorzusehen. Das Dosierventil ist außerdem vorteilhaft, wenn der Kalibrierkörper hülsenförmig ist und der Kanal einen Kanalabschnitt aufweist, in welchem der Kalibrierkörper positioniert werden kann, um so die Federkraft der Feder auf den Ventilkörper einzustellen. Das Abstützbauteil ist vorzugsweise ebenfalls hülsenförmig und in dem Kanalabschnitt positioniert. The support component is preferably located directly on the calibration. The support member extends the calibration. The section of the support component is preferably designed such that the support component is supported on a valve holder for the metering valve. The length with which the section projects beyond the valve housing is preferably selected accordingly. Thus, the force for holding the calibration can be further increased. The valve holder is, for example, a receptacle for the metering valve in a supply device for adding the liquid additive to an exhaust gas treatment device. In particular, the extension of the support component makes it possible to realize a cohesive connection with the valve housing and / or to reduce an upstream inflow volume (cavity) and / or to provide a guide / support for the support component outside the valve housing. The metering valve is also advantageous when the calibration body is sleeve-shaped and the channel has a channel portion in which the calibration can be positioned so as to adjust the spring force of the spring on the valve body. The support member is preferably also sleeve-shaped and positioned in the channel section.
Der Kanal ist vorzugsweise abschnittsweise zylindrisch geformt und hat bevorzugt eine kreisförmige Querschnittsfläche. Der hülsenförmige Kalibrierkörper ist an die zylindrische Form des Kanals vorzugsweise derart angepasst, dass der Kalibrierkörper an der Wandung des Kanals anliegt, so dass flüssiges Additiv nicht zwischen dem Kalibrierkörper und der Wand des Kanals hindurchfließt, sondern sich ein Strömungsweg für das flüssige Additiv durch den hülsenförmigen Kalibrierkörper hindurch erstreckt. Der Kalibrierkörper weist vorzugsweise einen (stirnseitigen) Abstützabschnitt auf, an welchem sich die Feder abstützt. Die Federkraft der Feder, welche auf den Ventilkörper wirkt, wirkt vorzugsweise an dem dem Ventilkörper gegenüberliegenden Ende der Feder auf den Kalibrierkörper. Die Feder ist zwischen dem Ventilkörper und dem Kalibrierkörper verspannt. Der Kanalabschnitt, welcher vorzugsweise zylindrisch geformt ist, damit der Kalibrierkörper darin positioniert werden kann, ist vorzugsweise etwas länger ausgestaltet als der Kalibrierkörper, damit die Position des Kalibrierkörpers in dem Kanalabschnitt in einem Bereich variiert werden kann, um die weiter oben beschriebenen Fertigungstoleranzen der Feder auszugleichen. The channel is preferably cylindrically shaped in sections and preferably has a circular cross-sectional area. The sleeve-shaped calibration body is preferably adapted to the cylindrical shape of the channel such that the calibration body bears against the wall of the channel, so that liquid additive does not flow between the calibration body and the wall of the channel, but a flow path for the liquid additive through the sleeve-shaped Calibration body extends therethrough. The calibration body preferably has one (frontal) support portion on which the spring is supported. The spring force of the spring, which acts on the valve body, preferably acts on the valve body opposite the end of the spring on the calibration. The spring is clamped between the valve body and the calibration. The channel portion, which is preferably cylindrically shaped so that the calibration body can be positioned therein, is preferably made somewhat longer than the calibration body, so that the position of the calibration in the channel section can be varied in a range to compensate for the manufacturing tolerances of the spring described above ,
Das Dosierventil ist auch vorteilhaft, wenn der Ventilkörper in der Ruhestellung an einem Schließsitz anliegt, das Dosierventil in der Ruhestellung geschlossen ist und der Ventilkörper zum Öffnen des Dosierventils entgegen der Federkraft von dem Schließsitz weg bewegbar ist. Der Schließsitz bildet vorzugsweise die Stelle des Dosierventils bzw. des Ventilgehäuses, an welchem der Ventilkörper in der Ruhestellung anliegt. Der Ventilkörper und der Schließsitz zusammen unterbrechen vorzugsweise den Strömungsweg durch das Dosierventil von dem Einlass zu dem Auslass, wenn der Ventilkörper an dem Schließsitz anliegt. In der Ruhestellung ist das Dosierventil vorzugsweise geschlossen. The metering valve is also advantageous if the valve body rests in the rest position on a closing seat, the metering valve is closed in the rest position and the valve body for opening the metering valve against the spring force of the closing seat is movable away. The closing seat preferably forms the location of the metering valve or of the valve housing on which the valve body rests in the rest position. The valve body and the closing seat together preferably interrupt the flow path through the metering valve from the inlet to the outlet when the valve body abuts the closing seat. In the rest position, the metering valve is preferably closed.
Das Dosierventil ist auch vorteilhaft, wenn der Kalibrierkörper über eine Pressverbindung mit dem Dosierventil verbunden ist. Der Kalibrierkörper ist (wie bereits weiter oben beschrieben) vorzugsweise in einem Kanalabschnitt eines Kanals in dem Dosierventil positioniert. Der Kalibrierkörper, welcher vorzugsweise hül- senförmig ist, ist vorzugsweise in radialer Richtung verformbar. So kann der Kalibrierkörper zunächst in dem Kanalabschnitt positioniert werden und dann in radialer Richtung ausgedehnt werden, um gegen eine Wandung des Kanals gepresst zu werden. Eine solche Verformung verändert vorzugsweise nicht die Positionierung des Kalibrierkörpers in axialer Richtung (entlang des Kanals), durch welche die auf die Feder vom dem Kalibrierkörper ausgeübte Federkraft beeinflusst wird. Weiterhin vorteilhaft ist das Dosierventil, wenn das Dosierventil eine Öffnung aufweist, durch welche das zu dosierende Fluid in das Dosierventil gelangen kann, weiter sich der Kalibrierkörper und das Abstützbauteil ausgehend von der Feder bis hin zu der Öffnung erstrecken, und die stoffschlüssige Verbindung an einer Außenfläche des Abstützbauteils und an der Öffnung ausgebildet ist. Das Abstützbauteil erstreckt sich nicht nur bis zu der Öffnung, sondern mit einem Abschnitt noch über die Öffnung hinaus. The metering valve is also advantageous if the calibration body is connected to the metering valve via a press connection. The calibration body is (as already described above) preferably positioned in a channel section of a channel in the metering valve. The calibration body, which is preferably sleeve-shaped, is preferably deformable in the radial direction. Thus, the calibration body may first be positioned in the channel portion and then expanded in the radial direction to be pressed against a wall of the channel. Such deformation preferably does not alter the positioning of the calibration body in the axial direction (along the channel), which influences the spring force exerted on the spring by the calibration body. Furthermore, the metering valve is advantageous if the metering valve has an opening through which the fluid to be metered can enter the metering valve, the calibration body and the support component continue from the spring up to the opening, and the integral connection on an outer surface the support member and is formed at the opening. The support member extends not only to the opening, but with a portion still beyond the opening.
Die beschriebene Öffnung stellt vorzugsweise gleichzeitig den Einlass für das flüssige Additiv in das Dosierventil dar. Außerdem stellt die Öffnung vorzugsweise gleichzeitig einen Eingang in den Kanal durch das Dosierventil dar, in welchem der Kanalabschnitt angeordnet ist, in dem der Kalibrierkörper platziert werden kann. Dadurch, dass der Kalibrierkörper und das Abstützbauteil sich von der Feder bis hin zu der Öffnung erstrecken, wird es ermöglicht, dass die stoffschlüs- sige Verbindung unmittelbar an der Öffnung vorzusehen. So ist die Position der stoffschlüssigen Verbindung leicht zugänglich und die stoffschlüssige Verbindung ist mit geringem Aufwand herzustellen. The described opening preferably simultaneously constitutes the inlet for the liquid additive into the metering valve. In addition, the opening preferably simultaneously constitutes an inlet into the channel through the metering valve, in which the channel section is arranged, in which the calibrating body can be placed. The fact that the calibration body and the support member extend from the spring to the opening, it is possible to provide the stoffschlüs- sige connection directly to the opening. Thus, the position of the cohesive connection is easily accessible and the cohesive connection can be produced with little effort.
Besonders bevorzugt ist, wenn die stoffschlüssige Verbindung umlaufend an der Außenfläche des Abstützbauteils ausgebildet ist. Die Außenfläche des Abstützbauteils ist an dem Abschnitt des Abstützbauteils, der aus dem Ventilgehäuse hervorsteht, beispielsweise für ein Schweißgerät sehr gut zugänglich. Außerdem steht die Außenfläche in direktem Kontakt zu dem Ventilgehäuse. Daher ist es vorteilhaft, dort eine (umlaufende) stoffschlüssige (Schweiß-)Verbindung herzustellen. It is particularly preferred if the cohesive connection is formed circumferentially on the outer surface of the support member. The outer surface of the support member is at the portion of the support member which protrudes from the valve housing, for example, a welder very accessible. In addition, the outer surface is in direct contact with the valve housing. Therefore, it is advantageous to produce there a (circumferential) cohesive (welding) connection.
Im Rahmen der Erfindung wird auch ein Kraftfahrzeug vorgeschlagen, zumindest aufweisend eine Verbrennungskraftmaschine, eine Abgasbehandlungsvorrichtung zur Reinigung der Abgase der Verbrennungskraftmaschine und eine Zufuhrvorrichtung zur Zufuhr eines Additivs in die Abgasbehandlungsvorrichtung mit ei- nem erfindungsgemäßen Dosierventil. Die Erfindung sowie das technische Umfeld werden nachfolgend anhand der Figuren näher erläutert. Die Figuren zeigen besonders bevorzugte Ausführungsbeispiele, auf die die Erfindung jedoch nicht begrenzt ist. Insbesondere ist darauf hinzuweisen, dass die Figuren und insbesondere die dargestellten Größen verhält- nisse nur schematisch sind. Es zeigen: In the context of the invention, a motor vehicle is proposed, at least comprising an internal combustion engine, an exhaust gas treatment device for cleaning the exhaust gases of the internal combustion engine and a supply device for supplying an additive in the exhaust gas treatment device with a metering valve according to the invention. The invention and the technical environment will be explained in more detail with reference to FIGS. The figures show particularly preferred embodiments, to which the invention is not limited. In particular, it should be noted that the figures and in particular the size ratios shown are only schematic. Show it:
Fig. 1: eine Ausführungsvariante eines Dosierventils in geschlossenem Zustand, Fig. 2: ein Detail eines Dosierventils, und 1 shows an embodiment variant of a metering valve in the closed state, FIG. 2 shows a detail of a metering valve, and FIG
Fig. 3: ein Kraftfahrzeug, aufweisend ein Dosierventil. Fig. 3: a motor vehicle, comprising a metering valve.
Die Fig. 1 zeigt ein Dosierventil 1 aufweisend ein Ventilgehäuse 6, durch welches ein Kanal 7 verläuft. In dem Kanal 7 ist ein Ventilkörper 2 angeordnet. Der Ventilkörper 2 ist mit einer Feder 3 in dem Dosierventil 1 bzw. in dem Ventilgehäuse 6 bzw. in dem Kanal 7 verspannt. Dazu ist die Feder 3 gegen einen Kalibrierkörper 4 abgestützt. Der Kalibrierkörper 4, die Feder 3 und der Ventilkörper 2 sind durch eine Öffnung 11 des Kanals 7 hindurch in das Ventilgehäuse 6 eingesetzt. Der Kalibrierkörper 4 befindet sich dabei in einem Kanalabschnitt 8 des Kanals 7. Die Feder 3 übt auf den Ventilkörper 2 eine definierte Kraft aus, welche den Ventilkörper 2 gegen einen Schließsitz 9 drückt, und das Dosierventil 1 so verschließt. Der Ventilkörper 2 kann mit einem nicht dargestellten Antrieb entgegen der von der Feder 3 ausgeübten Federkraft bewegt werden, um den Ventilkörper 2 von dem Schließsitz 9 wegzugeben und so einen Strömungsweg 10 durch das Dosierventil 1 von einem Einlass 21 zu einem Auslass 22 freizugeben und das Dosierventil 1 so zu öffnen. Das Dosierventil 1 bzw. das Ventilgehäuse 6 des Dosierventils 1 weist vorzugsweise an einer Außenfläche Dichtungen 23 auf, mit welcher das Dosierventil 1 fluiddicht in eine nicht dargestellte Zufuhrvorrichtung einge- setzt werden kann, mit welcher flüssiges Additiv in eine Abgasbehandlungsvorrichtung zugeführt werden kann. In einer solchen Zufuhrvorrichtung übernimmt das Dosierventil 1 die Aufgabe, die von der Zufuhrvorrichtung zugeführte Menge an flüssigem Additiv einzustellen. Fig. 1 shows a metering valve 1 comprising a valve housing 6, through which a channel 7 extends. In the channel 7, a valve body 2 is arranged. The valve body 2 is braced with a spring 3 in the metering valve 1 or in the valve housing 6 or in the channel 7. For this purpose, the spring 3 is supported against a calibration 4. The calibration body 4, the spring 3 and the valve body 2 are inserted through an opening 11 of the channel 7 into the valve housing 6. The calibration 4 is located in a channel section 8 of the channel 7. The spring 3 exerts on the valve body 2 a defined force, which presses the valve body 2 against a closing seat 9, and the metering valve 1 so closes. The valve body 2 can be moved with a drive, not shown, against the force exerted by the spring 3 spring force to the valve body 2 away from the closing seat 9 and so release a flow path 10 through the metering valve 1 from an inlet 21 to an outlet 22 and the metering valve 1 so open. The metering valve 1 or the valve housing 6 of the metering valve 1 preferably has seals 23 on an outer surface, with which the metering valve 1 can be inserted in a fluid-tight manner into a feed device, not shown, with which liquid additive can be fed into an exhaust gas treatment device. In such a feeder takes over the metering valve 1 has the task to set the supplied from the supply device amount of liquid additive.
Der Kalibrierkörper 4 ist an einem Abstützbauteil 13 abgestützt. Das Abstützbau- teil 13 stützt den Kalibrierkörper 4 ab. Die stoffschlüssige Verbindung 5 ist an einer Außenfläche 12 an dem Abstützbauteil 13 im Bereich eines Abschnitts 14 des Abstützbauteils 13 ausgebildet, wobei der Abschnitt 14 aus dem Ventilgehäuse 6 hervor steht. Dadurch ist die stoffschlüssige Verbindung 5 in der Nähe der Öffnung 11 angeordnet. Ein Werkzeug zur Ausbildung der Stoff schlüssigen Ver- bindung 5 muss daher nicht sehr tief in den Kanal 7 eindringen, sondern kann in der Nähe der Öffnung 11 verbleiben. The calibration body 4 is supported on a support member 13. The support component 13 supports the calibration body 4. The cohesive connection 5 is formed on an outer surface 12 on the support member 13 in the region of a portion 14 of the support member 13, wherein the portion 14 protrudes from the valve housing 6. As a result, the cohesive connection 5 is arranged in the vicinity of the opening 11. A tool for forming the substance-coherent connection 5 therefore does not have to penetrate very deeply into the channel 7, but may remain in the vicinity of the opening 11.
Fig. 2 zeigt ein Detail eines Dosierventils. Zu sehen sind ein Teil des Abstützbauteils 13 und ein Teil des Ventilgehäuses 6 Das Abstützbauteil 13 ist hülsenförmig ausgebildet und hier ist nur ein Schnitt durch die Wandung des Abstützbauteils 13 dargestellt. Die Stoff schlüssige Verbindung 5 ist an der Außenfläche 12 des Abstützbauteils 13 in einem Abschnitt 14 ausgebildet, welcher sich aus dem Ventilgehäuse 6 hinaus erstreckt. Die Stoff schlüssige Verbindung 5 kann umlaufend entlang der gesamten Außenfläche 12 des Abstützbauteils 13 linienförmig ausge- bildet sein. Fig. 2 shows a detail of a metering valve. To see are a part of the support member 13 and a part of the valve housing 6 The support member 13 is formed sleeve-shaped and here only a section through the wall of the support member 13 is shown. The fluid-tight connection 5 is formed on the outer surface 12 of the support member 13 in a portion 14 which extends out of the valve housing 6 also. The substance-coherent connection 5 can be circumferentially formed along the entire outer surface 12 of the support member 13 in a line.
Fig. 3 zeigt ein Kraftfahrzeug 15, aufweisend eine Verbrennungskraftmaschine 16 und eine Abgasbehandlungsvorrichtung 17 zur Reinigung der Abgase der Verbrennung skraftmaschine 16. Das Kraftfahrzeug 15 weist auch einen Tank 19 auf, in welchem flüssiges Additiv (beispielsweise Harnstoff- Wasser- Lösung) gespeichert ist. Das flüssige Additiv aus dem Tank 19 kann mit einer Fördereinheit 20 (z. B. einer Pumpe) zu einer Zufuhrvorrichtung 18 gefördert werden. In der Zufuhrvorrichtung 18 ist ein Dosierventil 1 vorgesehen, mit welchem das flüssige Additiv der Abgasbehandlungsvorrichtung 17 zugeführt werden kann. Bezugszeichenliste Fig. 3 shows a motor vehicle 15, comprising an internal combustion engine 16 and an exhaust gas treatment device 17 for cleaning the exhaust gases of the combustion engine 16. The motor vehicle 15 also has a tank 19, in which liquid additive (for example, urea-water solution) is stored. The liquid additive from the tank 19 may be delivered to a supply device 18 with a delivery unit 20 (eg, a pump). In the supply device 18, a metering valve 1 is provided, with which the liquid additive of the exhaust gas treatment device 17 can be supplied. LIST OF REFERENCE NUMBERS
1 Dosierventil 1 metering valve
-z>- Ventilkörper  -z> - valve body
3 Feder  3 spring
4 Kalibrierkörper  4 calibration body
5 stoffschlüssige Verbindung 5 cohesive connection
6 Ventilgehäuse 6 valve housing
7 Kanal  7 channel
8 Kanalabschnitt  8 channel section
9 Schließsitz  9 closing seat
10 Strömungsweg  10 flow path
11 Öffnung  11 opening
12 Außenfläche  12 outer surface
13 Abstützbauteil  13 support component
14 Abschnitt  14 section
15 Kraftfahrzeug  15 motor vehicle
16 Verbrennungskraftmaschine 16 internal combustion engine
17 Abgasbehandlungsvorrichtung17 exhaust treatment device
18 Zufuhrvorrichtung 18 feeder
19 Tank  19 tank
20 Fördereinheit  20 feed unit
21 Einlas s  21 Einlas s
22 Auslas s  22 outlets s
23 Dichtung  23 seal

Claims

Patentansprüche Patent claims
Dosierventil (1), zumindest aufweisend ein Ventilgehäuse (6), mit einem Kanal (7) und einem Ventilkörper (2), der beweglich ist, um das Dosierventil (1) zu öffnen und zu schließen und eine Feder (3), welche eine Federkraft auf den Ventilkörper (2) ausübt und den Ventilkörper (2) so in einer Ruhestellung hält, wobei die Feder (3) an mindestens einem Kalibrierkörper (4) abgestützt ist, der Ventilkörper Metering valve (1), at least comprising a valve housing (6), with a channel (7) and a valve body (2) which is movable to open and close the metering valve (1) and a spring (3) which is a Spring force exerts on the valve body (2) and holds the valve body (2) in a rest position, the spring (3) being supported on at least one calibration body (4), the valve body
(2), die Feder (3) und der mindestens eine Kalibrierkörper (4) in dem Kanal (7) angeordnet sind und der mindestens eine Kalibrierkörper (4) von einem Abstützbauteil (13) abgestützt ist, welches mit einer stoffschlüssigen Verbindung (5) in dem Ventilgehäuse (6) befestigt ist, wobei ein Abschnitt (14) des Abstützbauteil (13) aus dem Ventilgehäuse (6) hervorsteht. (2), the spring (3) and the at least one calibration body (4) are arranged in the channel (7) and the at least one calibration body (4) is supported by a support component (13) which has a cohesive connection (5). is fastened in the valve housing (6), with a section (14) of the support component (13) protruding from the valve housing (6).
Dosierventil (1) nach Patentanspruch 1, wobei der Kalibrierkörper (4) hül- senförmig ist, und der Kanal (7) einen Kanalabschnitt (8) aufweist, in welchem der Kalibrierkörper (4) positioniert werden kann, um so die Federkraft der Feder Metering valve (1) according to claim 1, wherein the calibration body (4) is sleeve-shaped, and the channel (7) has a channel section (8) in which the calibration body (4) can be positioned in order to increase the spring force of the spring
(3) auf den Ventilkörper (2) einzustellen. (3) on the valve body (2).
Dosierventil (1) nach einem der vorhergehenden Patentansprüche, wobei der Kalibrierkörper (4) über eine Pressverbindung (10) mit dem Dosierventil (1) verbunden ist. Metering valve (1) according to one of the preceding claims, wherein the calibration body (4) is connected to the metering valve (1) via a press connection (10).
Dosierventil (1) nach einem der vorhergehenden Patentansprüche, wobei das Dosierventil (1) eine Öffnung (11) aufweist, durch welche das zu dosierende Fluid in das Dosierventil (1) gelangen kann, weiterhin der Kalibrierkörper Metering valve (1) according to one of the preceding claims, wherein the metering valve (1) has an opening (11) through which the fluid to be metered can pass into the metering valve (1), furthermore the calibration body
(4) und das Abstützbauteil (13) sich ausgehend von der Feder (3) bis hin zu der Öffnung (11) erstrecken, und die Stoff schlüssige Verbindung (5) an einer Außenfläche (12) des Abstützbauteils (13) und an der Öffnung (11) ausgebildet ist. (4) and the support component (13) extend from the spring (3) to the opening (11), and the material-fitting connection (5) on an outer surface (12) of the support component (13) and at the opening (11) is formed.
5. Dosierventil (1) nach einem der vorhergehenden Patentansprüche, wobei die stoffschlüssige Verbindung (5) umlaufend an der Außenfläche (12) des Abstützbauteils (13) ausgebildet ist. 5. Metering valve (1) according to one of the preceding claims, wherein the cohesive connection (5) is formed all around on the outer surface (12) of the support component (13).
EP14700175.4A 2013-02-08 2014-01-09 Metering valve for additives at risk of freezing Withdrawn EP2954178A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013101282.5A DE102013101282A1 (en) 2013-02-08 2013-02-08 Dosing valve for freeze-risk additives
PCT/EP2014/050255 WO2014121966A1 (en) 2013-02-08 2014-01-09 Metering valve for additives at risk of freezing

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EP2954178A1 true EP2954178A1 (en) 2015-12-16

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EP14700175.4A Withdrawn EP2954178A1 (en) 2013-02-08 2014-01-09 Metering valve for additives at risk of freezing

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US (1) US9739189B2 (en)
EP (1) EP2954178A1 (en)
JP (1) JP2016507028A (en)
KR (1) KR20150114544A (en)
CN (1) CN104968910B (en)
DE (1) DE102013101282A1 (en)
RU (1) RU2659847C2 (en)
WO (1) WO2014121966A1 (en)

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DE102012002061A1 (en) * 2012-02-03 2013-08-08 Emitec Gesellschaft Für Emissionstechnologie Mbh Dosing valve for freeze-risk additives
KR102591237B1 (en) 2021-04-12 2023-10-18 류대희 Inner Box For Passive Typed Container For Constant Temperature

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US2908288A (en) * 1955-04-13 1959-10-13 Crane Co Calibrated relief valve
US5692723A (en) * 1995-06-06 1997-12-02 Sagem-Lucas, Inc. Electromagnetically actuated disc-type valve
JP3791591B2 (en) 2000-11-29 2006-06-28 株式会社デンソー Fuel injection valve, adjustment pipe for adjusting spring force thereof, and press-fitting method thereof
DE10139499C1 (en) * 2001-08-10 2003-03-13 Lucas Automotive Gmbh Composite component, in particular valve, and method for producing the same
DE60306333T2 (en) 2003-04-08 2007-05-31 Siemens Ag Two-barrel fuel injection valve and method for adjusting the preload of a loading spring of a spring-loaded injector
PL1676988T3 (en) * 2004-12-30 2008-03-31 Grundfos No Nox As Dosing pump unit
DE102010002335A1 (en) * 2010-02-25 2011-08-25 Robert Bosch GmbH, 70469 Manufacturing device for mounting a solenoid valve
DE102012002061A1 (en) 2012-02-03 2013-08-08 Emitec Gesellschaft Für Emissionstechnologie Mbh Dosing valve for freeze-risk additives

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Title
See references of WO2014121966A1 *

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DE102013101282A1 (en) 2014-08-14
RU2015138143A (en) 2017-03-16
CN104968910A (en) 2015-10-07
WO2014121966A1 (en) 2014-08-14
JP2016507028A (en) 2016-03-07
US9739189B2 (en) 2017-08-22
RU2659847C2 (en) 2018-07-04
KR20150114544A (en) 2015-10-12
CN104968910B (en) 2018-10-23
US20150377105A1 (en) 2015-12-31

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