EP3058229B1 - Pump - Google Patents
Pump Download PDFInfo
- Publication number
- EP3058229B1 EP3058229B1 EP14783638.1A EP14783638A EP3058229B1 EP 3058229 B1 EP3058229 B1 EP 3058229B1 EP 14783638 A EP14783638 A EP 14783638A EP 3058229 B1 EP3058229 B1 EP 3058229B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- impeller
- additive
- electric motor
- conveying direction
- 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.)
- Active
Links
- 239000000654 additive Substances 0.000 claims description 19
- 230000000996 additive effect Effects 0.000 claims description 17
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 5
- 238000005086 pumping Methods 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
-
- 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
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D3/00—Axial-flow pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D5/00—Pumps with circumferential or transverse flow
- F04D5/002—Regenerative pumps
- F04D5/003—Regenerative pumps of multistage type
- F04D5/006—Regenerative pumps of multistage type the stages being axially offset
Description
Gegenstand der Erfindung ist eine Pumpe mit einem Gehäuse, in dem ein Elektromotor eine von einer Welle des Elektromotors antreibbare Pumpstufe angeordnet ist.The invention relates to a pump with a housing in which an electric motor is arranged to be driven by a shaft of the electric motor pumping stage.
Derartige Pumpen sind bekannt und werden insbesondere in Kraftfahrzeugen zum Fördern von Additiven, die dem Kraftstoff beigemengt werden, eingesetzt. Die zugemischten Additive haben die Aufgabe, Stickstoffoxide im Abgas von Kraftfahrzeugen zu reduzieren. Aufgrund der dadurch bewirkten chemischen Reaktion werden diese Pumpen auch als SCR-Pumpen bezeichnet. Das Additiv wird von der SCR-Pumpe aus einem Behälter über eine Leitung dem Kraftstoff zugeführt. Um ein Einfrieren der das Additiv enthaltenden Leitung zu verhindern, wird die Leitung außerhalb des Fahrbetriebs entleert. Das Entleeren erfolgt durch Umpolen der Drehrichtung der SCR-Pumpe, so dass die Förderrichtung der SCR-Pumpe von der Leitung in den Additivbehälter gerichtet ist. Als Pumpentyp werden Verdrängerpumpen verwendet, da diese in Abhängigkeit der Drehrichtung sowohl vorwärts als auch rückwärts fördern können. Der Nachteil von Verdrängerpumpen ist ihr aufwändiger und damit kostenintensiver Aufbau.Such pumps are known and are used in particular in motor vehicles for conveying additives, which are added to the fuel. The admixed additives have the task of reducing nitrogen oxides in the exhaust gas of motor vehicles. Due to the resulting chemical reaction, these pumps are also referred to as SCR pumps. The additive is supplied by the SCR pump from a container via a line to the fuel. In order to prevent freezing of the additive containing line, the line is emptied out of driving. The emptying takes place by reversing the direction of rotation of the SCR pump so that the conveying direction of the SCR pump is directed from the line into the additive container. Displacement pumps are used as the pump type because they can deliver both forward and reverse depending on the direction of rotation. The disadvantage of positive displacement pumps is their complex and therefore expensive construction.
Die
Der Erfindung liegt die Aufgabe zugrunde, eine kostengünstige Pumpe zu schaffen, die mit geringem Aufwand durch Umkehr der Drehrichtung in zwei Richtungen fördern kann.The invention has for its object to provide a cost-effective pump that can promote with little effort by reversing the direction of rotation in two directions.
Gelöst wird die Aufgabe durch eine Pumpe gemäß unabhängigem Anspruch 1. Mit der Verwendung von Peripheral- und/oder Seitenkanalstufen werden Pumpstufen vom Strömungspumpentyp anstelle von Verdrängerpumpen verwendet. Diese sind aufgrund ihres Aufbaus deutlich kostengünstiger als Verdrängerpumpen. Dabei wird bewusst in Kauf genommen, dass die Peripheral- oder Seitenkanalstufen nur in eine Richtung fördern können, so dass für jede Förderrichtung eine Pumpstufe erforderlich ist. Mit dieser Anordnung übernimmt in Abhängigkeit von der Drehrichtung des Elektromotors jeweils ein Laufrad die Förderung, während das andere Laufrad aufgrund seiner gegenläufigen Anordnung der Förderung entgegenwirkt. Da der Einfluss des in Förderrichtung wirkenden Laufrads immer größer als das der Förderrichtung entgegenwirkende Laufrad ist, wird so eine Förderung in zwei Richtungen mit je einer Pumpstufe vom Strömungspumpentyp ermöglicht. Aufgrund der relativ geringen Fördermenge sowohl in Hauptförderrichtung beim Zumischen des Additivs als auch in Nebenförderrichtung beim Entleeren der Leitung wird die Minderung der Förderleistung von den Vorteilen der Verwendung von Peripheral- oder Seitenkanalstufen gegenüber einer Verdrängerpumpe übertroffen. Hinzu kommt die insbesondere bei geringer Fördermenge wesentlich bessere Regelbarkeit von Peripheral- und Seitenkanalpumpen gegenüber Verdrängerpumpen.The problem is solved by a pump according to independent claim 1. With the use of peripheral and / or side channel stages, pump stages of the flow pump type are used instead of positive displacement pumps. Due to their design, these are significantly less expensive than positive displacement pumps. It is deliberately accepted that the peripheral or side channel stages can only promote in one direction, so that a pumping stage is required for each conveying direction. With this arrangement, depending on the direction of rotation of the electric motor in each case one impeller promotes the promotion, while counteracting the other impeller due to its opposite arrangement of the promotion. Since the influence of the impeller acting in the conveying direction is always greater than the impeller counteracting the conveying direction, so a promotion in two directions, each with a pump stage of the flow pump type is possible. Due to the relatively low flow rate both in the main conveying direction during admixing of the additive and in the secondary conveying direction when emptying the line, the reduction of the delivery rate is surpassed by the advantages of using peripheral or side channel steps over a positive displacement pump. In addition, there is the much better controllability of peripheral and side channel pumps compared to positive displacement pumps, especially with low flow rates.
Eine Erhöhung der Förderleistung wird erreicht, weil gemäß der Erfindung die beiden Laufräder eine V-Beschaufelung besitzen.
In einer weiteren vorteilhaften Ausgestaltung sind die Winkel der V-Beschaufelung beider Laufräder unterschiedlich sind. Auf diese Weise lassen sich die Laufräder an ihre jeweilige Förderaufgabe anpassen.
Ein besonders guter Wirkungsgrad wird erreicht, wenn der Winkel der V-Beschaufelung des in Hauptförderrichtung fördernden Laufrades größer als der Winkel der V-Beschaufelung des anderen Laufrades ist.An increase in the delivery rate is achieved because according to the invention, the two wheels have a V-blading.
In a further advantageous embodiment, the angles of the V-blading of both wheels are different. In this way, the wheels can be adapted to their respective conveying task.
A particularly good efficiency is achieved if the angle of the V-blading of the impeller conveying in the main conveying direction is greater than the angle of the V blading of the other impeller.
Aufgrund des einfachen Aufbaus und der guten Regelbarkeit bei den gegebenen Förderbedingungen eignet sich die erfindungsgemäße Pumpe insbesondere als SCR-Pumpe zum Fördern eines Additivs, welches dem Kraftstoff eine Kraftfahrzeugs beigemischt wird.Due to the simple structure and the good controllability under the given delivery conditions, the pump according to the invention is particularly suitable as an SCR pump for conveying an additive, which is admixed to the fuel of a motor vehicle.
An einem Ausführungsbeispiel wird die Erfindung näher beschrieben. Es zeigt in der einzigen Figur eine erfindungsgemäße Pumpe als SCR-Pumpe in einem Kraftfahrzeug. Die Pumpe 1 ist in einem Additivbehälter 2 angeordnet, aus dem sie in Hauptförderrichtung das Additiv über einen Einlass 3 ansaugt, über die erste Pumpstufe 4 und die zweite Pumpstufe 5, durch den Elektromotor 6 zu einem Auslass 7 fördert. Der Auslass 7 ist mit einer Förderleitung 8 verbunden, über die das Additiv dem Kraftstoff 9 zugemischt wird. Es ist aber auch denkbar die Pumpe 1 außerhalb des Additivbehälters 2 anzuordnen. Das Ansaugen des Additivs erfolgt dann über eine mit dem Einlass 3 verbundene Saugleitung, die in den Additivbehälter 2 geführt ist. Die Pumpe 1 besitzt ein Gehäuse in dem der Elektromotor 6 mit seiner Welle 10 angeordnet ist. Die Welle 10 ist zur drehfesten Mitnahme zweier Laufräder 11, 12 ausgebildet, die in einem Pumpengehäuse 13 angeordnet sind. Das erste Laufrad 11 bildet mit der dazugehörigen Pumpenkammer 14 die erste Pumpstufe 4, während das zweite Laufrad 12, mit der Pumpenkammer 15 die zweite Pumpstufe 5 bildet. Beide Laufräder 11, 12 sind als Seitenkanalräder ausgebildet. Die Laufräder 11, 12 besitzen zu beiden Seiten je einen Kranz von Schaufelkammern 16, 17 begrenzenden Schaufeln 18, 19. Die Schaufeln 18, 19 sind an dem jeweiligen Laufrad als V-Beschaufelung ausgebildet, wobei die Ausrichtung der V-Beschaufelung eines Laufrades 11 entgegengesetzt zur V-Beschaufelung des anderen Laufrades 12 ist.In one embodiment, the invention will be described in more detail. It shows in the single figure a pump according to the invention as an SCR pump in a motor vehicle. The pump 1 is arranged in an
Bei Drehung der Welle 10 des Elektromotors 3 in Hauptförderrichtung dreht sich das Laufrad 11 so, dass das Additiv über den Einlass 3 angesaugt wird und zu einem Auslass 20 der ersten Pumpstufe 4 gefördert wird. Von dort strömt das Additiv über einen Einlass 21 der zweiten Pumpstufe 5 in die Pumpenkammer 15 mit dem zweiten Laufrad 12. Dessen V-Beschaufelung ist der Strömungsrichtung des Additivs entgegengerichtet. Über einen Auslass 22 verlässt das Additiv nach Durchströmen der zweiten Pumpenkammer 15 das Pumpengehäuse 13.Upon rotation of the
Für die Nebenförderrichtung wird der Elektromotor 3 umgepolt, so dass sich die Welle 10 entgegengesetzt dreht. Aufgrund der Ausrichtung der V-Beschaufelungen der beiden Laufräder 11, 12 saugt nunmehr das Laufrad 12 der zweiten Pumpstufe 5 Additiv über den Auslass 22 an und fördert dieses durch die Pumpenkammer 15 zum Einlass 21 und über den Auslass 20 entgegen des Widerstands des Laufrades 11 der ersten Pumpstufe 4 über den Einlass 3 in den Additivbehälter 2. Auf diese Weise wird die Förderleitung 8 entleert, wodurch ein Einfrieren der Förderleitung 8 mit dem damit verbundenen Ausfall der Additivzumischung vermieden wird. In der gezeigten Darstellung sind die Winkel α, β mit der die Schaufeln 18, 19 gegenüber der Welle 10 geneigt sind, gleich. Es ist aber auch denkbar den Winkel β der Schaufeln 19 des in Nebenförderrichtung fördernden Laufrads 12 kleiner als den Winkel α zu wählen.For the secondary conveying direction of the
Claims (4)
- Pump having a housing in which an electric motor of a pump stage which can be driven by a shaft of the electric motor is arranged, wherein a second pump stage (5) which can be driven by the shaft (10) is arranged in series with respect to the first pump stage (4), wherein both pump stages (4, 5) are constructed as peripheral or lateral channel stages and the impellers (11, 12) of the two pump stages (4, 5) are arranged counter to the conveying direction of the other pump stage (5, 4) in each case, characterized in that the two impellers (11, 12) have a V-shaped blade arrangement, wherein, depending on the rotation direction of the electric motor, in each case one impeller carries out the conveying operation, whilst the other impeller as a result of its opposing arrangement counteracts the conveying.
- Pump according to Claim 1, characterized in that the angles (α, β) of the V-shaped blade arrangement of both impellers (11, 12) are different.
- Pump according to Claim 2, characterized in that the angle (α) of the V-shaped blade arrangement of the impeller (11) which conveys in the main conveying direction is greater than the angle (β) of the V-shaped blade arrangement of the other impeller (12).
- Use of a pump according to one of Claims 1 to 3 as an SCR pump for adding an additive to the fuel in a motor vehicle.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013220717.4A DE102013220717B4 (en) | 2013-10-14 | 2013-10-14 | pump |
PCT/EP2014/071844 WO2015055556A1 (en) | 2013-10-14 | 2014-10-13 | Pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3058229A1 EP3058229A1 (en) | 2016-08-24 |
EP3058229B1 true EP3058229B1 (en) | 2018-06-27 |
Family
ID=51690392
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14783638.1A Active EP3058229B1 (en) | 2013-10-14 | 2014-10-13 | Pump |
Country Status (5)
Country | Link |
---|---|
US (1) | US10519957B2 (en) |
EP (1) | EP3058229B1 (en) |
CN (1) | CN105637222B (en) |
DE (1) | DE102013220717B4 (en) |
WO (1) | WO2015055556A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015208472A1 (en) * | 2015-05-07 | 2016-11-10 | Robert Bosch Gmbh | Water injection device of an internal combustion engine |
DE102017203609A1 (en) | 2017-02-23 | 2018-08-23 | Mahle International Gmbh | Device for injecting water into an internal combustion engine |
DE102018217181B4 (en) * | 2018-10-08 | 2023-11-09 | Vitesco Technologies GmbH | Use of an electrically driven flow pump stage, a water delivery unit, a water injection system, an internal combustion engine and a vehicle |
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-
2013
- 2013-10-14 DE DE102013220717.4A patent/DE102013220717B4/en active Active
-
2014
- 2014-10-13 WO PCT/EP2014/071844 patent/WO2015055556A1/en active Application Filing
- 2014-10-13 EP EP14783638.1A patent/EP3058229B1/en active Active
- 2014-10-13 CN CN201480056337.2A patent/CN105637222B/en active Active
- 2014-10-13 US US15/029,069 patent/US10519957B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
CN105637222A (en) | 2016-06-01 |
DE102013220717A1 (en) | 2015-04-16 |
US10519957B2 (en) | 2019-12-31 |
DE102013220717B4 (en) | 2016-04-07 |
CN105637222B (en) | 2018-09-21 |
US20160230766A1 (en) | 2016-08-11 |
WO2015055556A1 (en) | 2015-04-23 |
EP3058229A1 (en) | 2016-08-24 |
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