DE102009045004A1 - Metering valve for measuring e.g. urea water solution during exhaust gas aftertreatment in internal combustion engine of motor vehicle, has flexible element arranged in area between closing unit and outlet in hollow valve needle - Google Patents
Metering valve for measuring e.g. urea water solution during exhaust gas aftertreatment in internal combustion engine of motor vehicle, has flexible element arranged in area between closing unit and outlet in hollow valve needle Download PDFInfo
- Publication number
- DE102009045004A1 DE102009045004A1 DE102009045004A DE102009045004A DE102009045004A1 DE 102009045004 A1 DE102009045004 A1 DE 102009045004A1 DE 102009045004 A DE102009045004 A DE 102009045004A DE 102009045004 A DE102009045004 A DE 102009045004A DE 102009045004 A1 DE102009045004 A1 DE 102009045004A1
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- DE
- Germany
- Prior art keywords
- valve
- piston
- valve needle
- displacement piston
- needle
- 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.)
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Classifications
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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
- 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
- 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
- F16K31/0651—One-way valve the fluid passing through the solenoid coil
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
- F16K31/0655—Lift valves
- F16K31/0665—Lift valves with valve member being at least partially ball-shaped
-
- 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
- F16K31/0686—Braking, pressure equilibration, shock absorbing
- F16K31/0693—Pressure equilibration of the armature
-
- 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
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Stand der TechnikState of the art
Die Erfindung geht aus von einem Ventil für ein strömendes Medium, insbesondere einem Dosierventil zum Zumessen einer Flüssigkeit, nach dem Oberbegriff des Anspruchs 1.The invention is based on a valve for a flowing medium, in particular a metering valve for metering a liquid, according to the preamble of claim 1.
Bei der Abgasnachbehandlung in Kraftfahrzeugen wird zur Reduzierung von Stickoxiden eine Harnstoff-Wasser-Lösung mittels eines Dosierventils in dosierten Mengen in das Abgas eingespritzt. Aufgrund des hohen Wasseranteils gefriert die im Betrieb des Kraftfahrzeugs unter Druck stehende Lösung schon bei geringen Temperaturen unter dem Nullpunkt. Die dabei im Dosierventil vorhandene Lösung dehnt sich beim Gefrieren aus und schädigt das Ventil, so dass dieses funktionsuntüchtig wird.In the exhaust aftertreatment in motor vehicles, a urea-water solution is injected by means of a metering valve in metered quantities into the exhaust gas to reduce nitrogen oxides. Due to the high water content, the solution under pressure during operation of the motor vehicle freezes below zero even at low temperatures. The solution present in the dosing valve expands during freezing and damages the valve, rendering it inoperative.
Um dem zu begegnen weist ein bekanntes, gefriertaugliches Dosierventil zum Einspritzen einer Harnstoff-Wasser-Lösung (
Ein bekanntes Kraftstoffeinspritzventil für Brennkraftmaschinen (
Offenbarung der ErfindungDisclosure of the invention
Das erfindungsgemäße Ventil mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass in fertigungstechnisch einfacher Weise im Ventil ein Ausgleichsraum für das gefrierende Medium geschaffen ist. Sobald die im Ventil vorhandene Mediummenge infolge Gefrierens ihr Volumen vergrößert, wird das elastische Element in Axialrichtung zusammengepresst und gibt sukzessive zusätzliches Volumen frei, das durch das gefrierende Medium eingenommen wird. Dadurch wirkt kein Eisdruck auf irgendein Bauelement im Innern des Ventilgehäuses, so dass keines der Bauteile beschädigt werden kann. Die Kompressibilität des elastischen Elements ist dabei so eingestellt, dass Druckschwankungen in dem im Ventil anstehenden Medium das Element nicht eindrücken.The valve according to the invention with the features of claim 1 has the advantage that a compensation chamber for the freezing medium is created in production engineering simple manner in the valve. As soon as the amount of medium present in the valve due to freezing increases its volume, the elastic element is compressed in the axial direction and gradually releases additional volume which is occupied by the freezing medium. As a result, no ice pressure acts on any component in the interior of the valve housing, so that none of the components can be damaged. The compressibility of the elastic element is adjusted so that pressure fluctuations in the pending medium in the valve do not press the element.
Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Ventils möglich.The measures listed in the further claims advantageous refinements and improvements of the claim 1 valve are possible.
Gemäß einer vorteilhaften Ausführungsform der Erfindung weist das elastische Element einen in der Ventilnadel geführten, radial dichtenden Verschiebekolben und eine den Verschiebekolben an einen Axialanschlag anlegende Druckfeder auf, wobei die Federkraft der Druckfeder die Kompressibilität des elastischen Elements bestimmt und so eingestellt ist, dass weder der im Ventil herrschende Mediumdruck noch dessen Schwankungen den Verschiebekolben bewegen. Dabei können Verschiebekolben und Druckfeder direkt in die Ventilnadel montiert, oder aber Verschiebekolben und Druckfeder durch Einbinden in eine becherartige Hülse als vorgefertigte Baueinheit in die Ventilnadel eingesetzt werden. Im ersten Fall dichtet der Verschiebekolben gegen die Ventilnadel, und der Axialanschlag ist durch eine Einschnürung der Ventilnadel, z. B. durch eine umlaufende Sicke oder durch am Umfang versetzte Sicken, auf der vom Schließglied abgekehrten Seite des Verschiebekolbens hergestellt, gegen die der Verschiebekolben durch die sich am Schließglied abstützende Druckfeder gedrückt wird. Im letzteren Fall dichtet der Verschiebekolben gegen die Hülse ab und der Axialanschlag wird durch eine Einbördelung des Stirnrands der becherförmigen Hülse hergestellt, so dass der Verschiebekolben durch die am Hülsengrund sich abstützende Druckfeder an die Einbördelung angepresst wird. According to an advantageous embodiment of the invention, the elastic element has a guided in the valve needle, radially sealing displacement piston and the displacement piston abutting an axial stop compression spring, wherein the spring force of the compression spring determines the compressibility of the elastic element and adjusted so that neither the in Valve prevailing medium pressure nor its fluctuations move the displacement piston. In this case, displacement piston and compression spring can be mounted directly in the valve needle, or displacement piston and compression spring can be inserted by incorporating into a cup-like sleeve as a prefabricated unit in the valve needle. In the first case, the sliding piston seals against the valve needle, and the axial stop is characterized by a constriction of the valve needle, z. B. by a circumferential bead or by circumferentially offset beads, made on the side facing away from the closing member side of the sliding piston, against which the sliding piston is pressed by the closing member supporting the compression spring. In the latter case, the displacement piston seals against the sleeve and the axial stop is produced by a flanging of the end edge of the cup-shaped sleeve, so that the displacement piston is pressed by the compression spring resting on the sleeve base to the flanging.
Gemäß einer vorteilhaften Ausführungsform der Erfindung wird die radiale Dichtfähigkeit des Verschiebekolbens mittels eines Dichtungsrings realisiert, der in eine Ringnut des Verschiebekolbens eingesetzt ist. Alternativ kann der Verschiebekolben zweigeteilt sein und zwischen den beiden Kolbenteilen eine Dichtungsscheibe einliegen.According to an advantageous embodiment of the invention, the radial sealing ability of the displacement piston is realized by means of a sealing ring which is inserted into an annular groove of the displacement piston. Alternatively, the displacement piston may be divided into two and einliegen a sealing washer between the two piston parts.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Die Erfindung ist anhand von in den Zeichnungen dargestellten Ausführungsbeispielen in der nachfolgenden Beschreibung näher erläutert. Es zeigen:The invention is explained in more detail in the following description with reference to exemplary embodiments illustrated in the drawings. Show it:
Das in
Das Ventil weist ein Ventilgehäuse
Zum Öffnen des Ventils durch Abheben des Schließglieds
Zur Herstellung einer Gefriertauglichkeit des Ventils in dem Sinne, dass das im Ventilgehäuse
Das kompressible, elastische Element
Im Ausführungsbeispiel der
Im Ausführungsbeispiel der
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 102004025062 B4 [0003] DE 102004025062 B4 [0003]
- DE 102004044821 A1 [0004] DE 102004044821 A1 [0004]
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009045004A DE102009045004A1 (en) | 2009-09-25 | 2009-09-25 | Metering valve for measuring e.g. urea water solution during exhaust gas aftertreatment in internal combustion engine of motor vehicle, has flexible element arranged in area between closing unit and outlet in hollow valve needle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009045004A DE102009045004A1 (en) | 2009-09-25 | 2009-09-25 | Metering valve for measuring e.g. urea water solution during exhaust gas aftertreatment in internal combustion engine of motor vehicle, has flexible element arranged in area between closing unit and outlet in hollow valve needle |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102009045004A1 true DE102009045004A1 (en) | 2011-03-31 |
Family
ID=43662576
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102009045004A Withdrawn DE102009045004A1 (en) | 2009-09-25 | 2009-09-25 | Metering valve for measuring e.g. urea water solution during exhaust gas aftertreatment in internal combustion engine of motor vehicle, has flexible element arranged in area between closing unit and outlet in hollow valve needle |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102009045004A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012009952B3 (en) * | 2012-05-18 | 2012-11-15 | Thomas Magnete Gmbh | Reciprocating piston pump for conveying and dosing aqueous solutions in exhaust gas cleaning system of vehicle, has spring area sealed against working fluid by piston and spring bearing, where area is filled with compressed gas |
WO2014072018A1 (en) * | 2012-11-07 | 2014-05-15 | L'orange Gmbh | Injector for reduction agent |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004044821A1 (en) | 2004-09-16 | 2006-03-23 | Robert Bosch Gmbh | Fuel injection valve for use in internal combustion engines, has valve needle that connects tubular anchor with valve closing body, where body serves as flattened sphere that is supported at valve needle shaft in form-fit manner |
DE102004025062B4 (en) | 2004-05-18 | 2006-09-14 | Hydraulik-Ring Gmbh | Freezer-compatible metering valve |
-
2009
- 2009-09-25 DE DE102009045004A patent/DE102009045004A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004025062B4 (en) | 2004-05-18 | 2006-09-14 | Hydraulik-Ring Gmbh | Freezer-compatible metering valve |
DE102004044821A1 (en) | 2004-09-16 | 2006-03-23 | Robert Bosch Gmbh | Fuel injection valve for use in internal combustion engines, has valve needle that connects tubular anchor with valve closing body, where body serves as flattened sphere that is supported at valve needle shaft in form-fit manner |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012009952B3 (en) * | 2012-05-18 | 2012-11-15 | Thomas Magnete Gmbh | Reciprocating piston pump for conveying and dosing aqueous solutions in exhaust gas cleaning system of vehicle, has spring area sealed against working fluid by piston and spring bearing, where area is filled with compressed gas |
WO2014072018A1 (en) * | 2012-11-07 | 2014-05-15 | L'orange Gmbh | Injector for reduction agent |
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Free format text: PREVIOUS MAIN CLASS: B01D0053900000 Ipc: F16K0031640000 Free format text: PREVIOUS MAIN CLASS: F16K0031680000 Ipc: F16K0031640000 |
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