DE102010039084A1 - Valve device for injecting reducing agent, particularly aqueous urea solution into exhaust line of motor vehicle, has valve housing for forming valve chamber, where compression body is arranged at distance to valve housing - Google Patents
Valve device for injecting reducing agent, particularly aqueous urea solution into exhaust line of motor vehicle, has valve housing for forming valve chamber, where compression body is arranged at distance to valve housing Download PDFInfo
- Publication number
- DE102010039084A1 DE102010039084A1 DE102010039084A DE102010039084A DE102010039084A1 DE 102010039084 A1 DE102010039084 A1 DE 102010039084A1 DE 102010039084 A DE102010039084 A DE 102010039084A DE 102010039084 A DE102010039084 A DE 102010039084A DE 102010039084 A1 DE102010039084 A1 DE 102010039084A1
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- Germany
- Prior art keywords
- valve
- reducing agent
- compression body
- valve housing
- valve device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 31
- 230000006835 compression Effects 0.000 title claims abstract description 31
- 238000007906 compression Methods 0.000 title claims abstract description 31
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims description 6
- 239000004202 carbamide Substances 0.000 title claims description 6
- 239000004809 Teflon Substances 0.000 claims abstract 2
- 229920006362 Teflon® Polymers 0.000 claims abstract 2
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 229920001343 polytetrafluoroethylene Polymers 0.000 abstract description 10
- 239000004810 polytetrafluoroethylene Substances 0.000 abstract description 10
- -1 Polytetrafluoroethylene Polymers 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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]
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- 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
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Technisches GebietTechnical area
Die Erfindung liegt auf dem technischen Gebiet der Abgasnachbehandlung und betrifft im Besonderen eine Ventilvorrichtung zum Einspritzen eines Reduktionsmittels in den Abgasstrang eines Kraftfahrzeuges. Als Reduktionsmittel findet insbesondere eine wässrige Harnstofflösung Einsatz, welche im Abgasstrang die Bildung von Amoniak bewirkt, der mit den im Abgas enthaltenen Stickoxiden in einem nachgeschalteten Katalysator zu harmlosem Stickstoff und Wasser reagiert. Dieser Vorgang ist auch unter der Bezeichnung selektive katalytische Reduktion bekannt. Der Stickoxidausstoss eines Kraftfahrzeuges, insbesondere eines solchen mit einem Dieselmotor, kann bei einer entsprechenden Nachbehandlung der Abgase deutlich abgesenkt werden.The invention is in the technical field of exhaust aftertreatment and, in particular, relates to a valve device for injecting a reducing agent into the exhaust gas system of a motor vehicle. The reducing agent used is in particular an aqueous urea solution which causes the formation of ammonia in the exhaust gas line, which reacts with the nitrogen oxides contained in the exhaust gas in a downstream catalytic converter to give harmless nitrogen and water. This process is also known as selective catalytic reduction. The nitrogen oxide emissions of a motor vehicle, in particular those with a diesel engine, can be significantly reduced with a corresponding aftertreatment of the exhaust gases.
Stand der TechnikState of the art
Ein Nachteil der wässrigen Harnstofflösung besteht darin, dass sie bei Temperaturen von weniger als –11°C gefriert und sich dabei ausdehnt. Um die Ventilvorrichtung zum Einspritzen des Reduktionsmittels vor Schäden durch Eisdruck zu schützen, sind bereits Ventilvorrichtungen mit einem im Ventilraum eingesetzten Kompressionskörper bekannt. Damit bei druckgesteuerten Systemen keine undefinierten Druckdämpfungen auftreten, gilt es Lufteinschlüsse zu vermeiden. Daher wird der Kompressionskörper spielfrei in den Ventilraum der Ventilvorrichtung eingesetzt.A disadvantage of the aqueous urea solution is that it freezes at temperatures of less than -11 ° C and thereby expands. In order to protect the valve device for injecting the reducing agent against damage by ice pressure valve devices are already known with a compression body inserted in the valve chamber. In order to avoid undefined pressure losses in pressure-controlled systems, air pockets should be avoided. Therefore, the compression body is used without play in the valve chamber of the valve device.
Als Kompressionskörper finden beispielsweise Füllkörper aus Polytetrafluorethylen (PTFE) Einsatz. PTFE weist jedoch einen höheren thermischen Ausdehnungskoeffizienten als zum Beispiel Stahl auf, einem Werkstoff, aus dem in der Regel das Ventilgehäuse besteht. Das spielfreie Einsetzen des PTFE-Füllkörpers in das Ventilgehäuse hat demnach zur Folge, dass sich der PTFE-Füllkörper bei Erreichen höherer Betriebstemperaturen nicht störungsfrei ausdehnen kann, sondern auf das Ventilschließelement drückt und dieses blockiert. Dies führt zum Versagen der Ventilvorrichtung. Aufgrund der hohen Spannungen erfährt der PTFE-Füllkörper zudem eine plastische Verformung.As a compression body, for example, fillers made of polytetrafluoroethylene (PTFE) use. However, PTFE has a higher coefficient of thermal expansion than, for example, steel, a material that usually makes up the valve body. The play-free insertion of the PTFE filling body in the valve housing has the consequence that the PTFE filler can not extend smoothly when reaching higher operating temperatures, but presses on the valve closing element and this blocked. This leads to failure of the valve device. Due to the high voltages of the PTFE packing also undergoes plastic deformation.
Aufgabe der vorliegenden Erfindung ist es, eine Ventilvorrichtung zum Einspritzen eines Reduktionsmittels in den Abgasstrang eines Kraftahrzeuges mit einem Kompressionskörper bereitzustellen, bei welcher die vorstehend beschriebenen Nachteile nicht oder nur in stark verringertem Maße auftreten.Object of the present invention is to provide a valve device for injecting a reducing agent into the exhaust line of a motor vehicle with a compression body, in which the disadvantages described above do not occur or only to a greatly reduced extent.
Die Aufgabe wird gelöst durch eine Ventilvorrichtung mit den Merkmalen des Anspruchs 1. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.The object is achieved by a valve device having the features of claim 1. Advantageous developments of the invention are specified in the subclaims.
Offenbarung der ErfindungDisclosure of the invention
Die vorgeschlagene Ventilvorrichtung zum Einspritzen eines Reduktionsmittels, insbesondere einer wässrigen Harnstofflösung, in den Abgasstrang eines Kraftfahrzeuges, umfasst ein Ventilgehäuse zur Ausbildung eines Ventilraumes, in dem ein Ventilschließelement hubbeweglich aufgenommen und mittels der Federkraft einer Druckfeder gegen einen Ventilsitz vorgespannt ist. Im Ventilraum ist ferner ein Kompressionskörper angeordnet. Erfindungsgemäß ist der Kompressionskörper beabstandet zum Ventilgehäuse angeordnet, so dass ein spaltartiger Freiraum zwischen Kompressionskörper und Ventilgehäuse ausgebildet wird, der im Betrieb der Ventilvorrichtung mit Reduktionsmittel gefüllt ist. Der Kompressionskörper ist dabei mit ausreichendem Spiel im Ventilgehäuse eingesetzt, so dass er sich bei Erwärmung – unabhängig vom Ausdehnungsverhalten des Ventilgehäuses – störungsfrei ausdehnen kann. Dabei erfährt er lediglich eine elastische Verformung. Das heißt, dass er bei sinkender Temperatur wieder in seine ursprüngliche Form zurückfindet.The proposed valve device for injecting a reducing agent, in particular an aqueous urea solution in the exhaust system of a motor vehicle, comprises a valve housing for forming a valve chamber in which a valve closing element is received liftable and biased by the spring force of a compression spring against a valve seat. In the valve chamber, a compression body is further arranged. According to the invention, the compression body is arranged at a distance from the valve housing, so that a gap-like free space is formed between the compression body and the valve housing, which is filled with reducing agent during operation of the valve device. The compression body is used with sufficient clearance in the valve housing, so that it can expand during heating - regardless of the expansion behavior of the valve housing - trouble-free. He experiences only an elastic deformation. This means that when the temperature drops, it returns to its original shape.
Der spaltartige Zwischenraum ist vorzugsweise so bemessen, dass sich der Kompressionskörper bei Erwärmung bis zur maximal auftretenden Temperatur störungsfrei und rein elastisch ausdehnen kann. Weiterhin ist das Spiel klein genug gewählt, um das mit Reduktionsmittel befüllte Ventilraumvolumen klein zu halten, da zur Vermeidung von unzulässig hohen Drücken beim Gefrieren des Reduktionsmittels das Volumen des Kompressionskörpers ein Vielfaches des mit Reduktionsmittel gefüllten Volumens sein muss.The gap-like intermediate space is preferably dimensioned so that the compression body can expand smoothly and purely elastically when heated up to the maximum occurring temperature. Furthermore, the clearance is chosen small enough to keep the filled with reducing agent valve space volume small, since to avoid inadmissibly high pressures during freezing of the reducing agent, the volume of the compression body must be a multiple of the volume filled with reducing agent.
Bevorzugt sind zumindest die den spaltartigen Freiraum begrenzenden Oberflächen des Kompressionskörpers mit einer Beschichtung versehen, die das Kriechverhalten des Reduktionsmittels unterstützt. Somit ist sicher gestellt, dass sich der spaltartige Zwischenraum mit Reduktionsmittel füllt und undefinierte Lufteinschlüsse vermieden werden.Preferably, at least the surfaces of the compression body delimiting the gap-like free space are provided with a coating which assists the creep behavior of the reducing agent. Thus, it is ensured that the gap-like gap fills with reducing agent and undefined air pockets are avoided.
Alternativ oder ergänzend kann vorgesehen sein, dass zumindest die den spaltartigen Freiraum begrenzenden Oberflächen des Ventilgehäuses mit einer Beschichtung versehen sind, die das Kriechverhalten des Reduktionsmittels unterstützt. Herkömmliche aus Stahl bestehende Ventilgehäuse bedürfen einer solchen Beschichtung in der Regel nicht, da sie bereits anziehend auf die meisten bekannten Reduktionsmittel, wie beispielsweise eine wässrige Harnstofflösung, wirken. Wird jedoch ein Stahl oder ein anderer Werkstoff zur Ausbildung des Ventilgehäuses verwendet, dessen Oberflächen abweisend in Bezug auf das eingesetzte Reduktionsmittel wirken, kann dem durch eine entsprechende Beschichtung entgegen gewirkt werden.Alternatively or additionally, it may be provided that at least the surfaces of the valve housing delimiting the gap-like free space are provided with a coating which assists the creep behavior of the reducing agent. Conventional steel valve housings generally do not require such a coating because they are already attractive to most known reducing agents, such as an aqueous urea solution. However, if a steel or other material is used to form the valve housing, the surfaces of which act repellent with respect to the reducing agent used, this can be counteracted by a corresponding coating.
Vorzugsweise besteht der Kompressionskörper zumindest teilweise aus Polytetrafluorethylen (PTFE). Dieser Werkstoff hat sich als dauerhaft beständig im Zusammenhang mit den bekannten Reduktionsmitteln erwiesen. Die den spaltartigen Zwischenraum begrenzenden Oberflächen des Kompressionskörpers aus PTFE sind weiterhin vorzugsweise mit einer Beschichtung versehen, welche das Kriechverhalten des Reduktionsmittels unterstützt.Preferably, the compression body consists at least partially of polytetrafluoroethylene (PTFE). This material has proven to be durable in the context of the known reducing agents. The surfaces of the compression body of PTFE which delimit the gap-like interspace are furthermore preferably provided with a coating which assists the creep behavior of the reducing agent.
Gemäß einer bevorzugten Ausführungsform der Erfindung umfasst das Ventilschließelement eine Ventilnadel und einen kugelförmigen Schließkörper. Weiterhin bevorzugt ist die Ventilvorrichtung druckgesteuert. Alternativ hierzu kann auch eine Betätigung mittels eines Magnet- oder eines Piezoaktors vorgesehen sein.According to a preferred embodiment of the invention, the valve closing element comprises a valve needle and a spherical closing body. Further preferably, the valve device is pressure-controlled. Alternatively, an actuation by means of a magnetic or a piezoelectric actuator may be provided.
Eine bevorzugte Ausführungsform der Erfindung wird nachfolgend anhand der einzigen Zeichnung näher erläutert. Diese zeigt einen Längsschnitt durch eine erfindungsgemäße Ventilvorrichtung.A preferred embodiment of the invention will be explained in more detail with reference to the single drawing. This shows a longitudinal section through a valve device according to the invention.
Ausführliche Beschreibung der ZeichnungDetailed description of the drawing
Dem dargestellten Längsschnitt ist eine Ventilvorrichtung mit einem Ventilgehäuse
Das Reduktionsmittel wird der Ventilvorrichtung über einen Reduktionsmittel-Anschluss
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010039084A DE102010039084A1 (en) | 2010-08-09 | 2010-08-09 | Valve device for injecting reducing agent, particularly aqueous urea solution into exhaust line of motor vehicle, has valve housing for forming valve chamber, where compression body is arranged at distance to valve housing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010039084A DE102010039084A1 (en) | 2010-08-09 | 2010-08-09 | Valve device for injecting reducing agent, particularly aqueous urea solution into exhaust line of motor vehicle, has valve housing for forming valve chamber, where compression body is arranged at distance to valve housing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE102010039084A1 true DE102010039084A1 (en) | 2012-02-09 |
Family
ID=45495077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE102010039084A Granted DE102010039084A1 (en) | 2010-08-09 | 2010-08-09 | Valve device for injecting reducing agent, particularly aqueous urea solution into exhaust line of motor vehicle, has valve housing for forming valve chamber, where compression body is arranged at distance to valve housing |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE102010039084A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8549840B2 (en) | 2010-11-12 | 2013-10-08 | Cummins Cal Pacific, Llc | Fluid injector |
| EP2647828A1 (en) * | 2012-04-06 | 2013-10-09 | Cummins Cal Pacific, LLC | Fluid injector |
| WO2014202260A1 (en) * | 2013-06-20 | 2014-12-24 | Robert Bosch Gmbh | Injection device |
-
2010
- 2010-08-09 DE DE102010039084A patent/DE102010039084A1/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8549840B2 (en) | 2010-11-12 | 2013-10-08 | Cummins Cal Pacific, Llc | Fluid injector |
| EP2647828A1 (en) * | 2012-04-06 | 2013-10-09 | Cummins Cal Pacific, LLC | Fluid injector |
| WO2014202260A1 (en) * | 2013-06-20 | 2014-12-24 | Robert Bosch Gmbh | Injection device |
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| R012 | Request for examination validly filed | ||
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| R018 | Grant decision by examination section/examining division |