EP2821647B1 - Selektive katalytische Reduktionsdosierpumpe - Google Patents

Selektive katalytische Reduktionsdosierpumpe Download PDF

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Publication number
EP2821647B1
EP2821647B1 EP13175379.0A EP13175379A EP2821647B1 EP 2821647 B1 EP2821647 B1 EP 2821647B1 EP 13175379 A EP13175379 A EP 13175379A EP 2821647 B1 EP2821647 B1 EP 2821647B1
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EP
European Patent Office
Prior art keywords
plunger
piston
axis
dosing pump
pumping
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
Application number
EP13175379.0A
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English (en)
French (fr)
Other versions
EP2821647A1 (de
Inventor
Keith E. Wright
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.)
Delphi International Operations Luxembourg SARL
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Delphi International Operations Luxembourg SARL
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 Delphi International Operations Luxembourg SARL filed Critical Delphi International Operations Luxembourg SARL
Priority to EP13175379.0A priority Critical patent/EP2821647B1/de
Priority to PCT/EP2014/061202 priority patent/WO2015000646A1/en
Publication of EP2821647A1 publication Critical patent/EP2821647A1/de
Application granted granted Critical
Publication of EP2821647B1 publication Critical patent/EP2821647B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • 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
    • F01N2610/1433—Pumps
    • 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]

Definitions

  • the present invention relates to a new Selective Catalytic Reduction dosing pump.
  • SCR Selective Catalytic Reduction
  • a dosing pump delivers a reagent in the exhaust pipe to chemically react with the gases within an SCR catalyst and eliminate NOx by up to 95%.
  • an in-line dosing pump comprising an electromagnetic actuator that actuates a pumping element.
  • Different model of vehicles demand different volume of reagent so, several pumps have to be designed and manufactured as described in EP1878920A1 . Considering this variety along with the lack of space available in a vehicle for such equipment it becomes important to have a compact pump that can be adapted to a plurality of needs.
  • the dosing pump delivers a reagent comprises a pumping part having a body, provided with a pumping element having a bore extending along a pumping axis within which is arranged a piston member.
  • the volume of the bore beyond the piston defines a dosing chamber where open an inlet and an outlet controlled by a valve, the piston reciprocally moves along said pumping axis between a downward position wherein the inlet is open letting the reagent fill the chamber and, a upward position wherein the inlet is closed and the valve open to let the reagent flow off the chamber.
  • the pump further comprises a piloted actuator having a plunger arranged to cooperate with the piston, the actuator comprising a coil and on the back end of the plunger is fixed a magnetic armature, the plunger reciprocally moves along a plunger axis angled relative to the piston axis. More precisely, the plunger reciprocally moves along the plunger axis between a backward position wherein the piston is in the downward position, and an frontward position wherein the piston is at the upward position.
  • a piloted actuator having a plunger arranged to cooperate with the piston, the actuator comprising a coil and on the back end of the plunger is fixed a magnetic armature, the plunger reciprocally moves along a plunger axis angled relative to the piston axis. More precisely, the plunger reciprocally moves along the plunger axis between a backward position wherein the piston is in the downward position, and an frontward position wherein the piston is at the upward position.
  • the pump further comprises a first elastic member permanently soliciting the plunger toward the backward position and, a second elastic member permanently soliciting the piston toward the downward position.
  • the plunger axis and the pumping axis intersect at a right angle.
  • the plunger and the piston have complementary shaped cooperating extremities, arranged so a displacement of the plunger along the plunger axis generates a displacement of the piston along the piston axis.
  • the complementary shaped cooperating extremities, of the plunger and the piston are inclined surfaces that can be conical surfaces.
  • the pump may comprise a plurality of pumping element radially arranged relative to the plunger axis, the plunger cooperating with all the pistons.
  • Selective Catalytic Reduction (SCR) system 10 delivers reagent R in the exhaust pipe to chemically react with the exhaust gases within a SCR catalyst and eliminate NOx by up to 95% from pipe emissions.
  • the SCR system 10 comprises a piloted dosing pump 12 which embodiment is now described in reference to the figures.
  • the dosing pump 12 comprises arranged in a backward body 14 a piloted actuator 16 extending along the longitudinal axis X and a pumping part 18 centrally arranged and extending along the vertical axis Z and, in a frontward body 20 a delivering part 22 represented on the right.
  • the backward body 14 comprises, described from the right to the left of figure 1 , a large radial disc-flange 24 from which backwardly (toward the left of the figure) extends a cylindrical portion 26 receiving the pumping part 18 that will be described afterward. From said cylindrical portion 26 extend an outer tubular cylindrical wall 28 and an inner tubular cylindrical wall 30. Both cylindrical walls are longitudinally coaxial X and define in between them a large recess 32 in which is arranged the coil 34 of the actuator 16.
  • the inner cylinder 30 is provided with an axial bore 36 which backward extremity 38 opens in a backward recess 40 and which frontward extremity 42 opens in a frontward recess 44.
  • a plunger 46 shaft In the bore 36 is slidably arranged a plunger 46 shaft axially extending throughout the bore 36.
  • a magnetic armature 50 On the back end 48 (left end) of the plunger 46 is fixed a magnetic armature 50 that has a disc-shape radially extending from the plunger 46.
  • the outer diameter of the magnetic armature 50 is the same as the outer diameter or the inner cylindrical wall 30.
  • the front end 52 (right end) of the plunger 46 is fixed an endpiece 54 having a conical shape.
  • the endpiece 54 may integrally be formed with the plunger as well as it may be made separate and assembled afterward.
  • the endpiece is shown with two symmetric conical faces, a backward face 56 which radius radially expends and a frontward face 58 which radius diminishes in a pointy tip.
  • the frontward conical face is the only functional face of the endpiece 54.
  • both conical faces, 56, 58 are made functional by increasing the longitudinal travel of the plunger 46. This permits a first pump event during the forward stroke of the plunger 46 and a second pump event during the return stroke, so two pump events while a single actuation event.
  • a longitudinal coil spring 59 arranged surrounding the plunger 46 is compressed between the bottom of the backward recess 40 and the magnetic armature 50 in which is arranged a spring seat.
  • the spring 59 permanently solicits the plunger 46 toward the back, the left of figure 1 .
  • a disc-shape back plug 60 also called outer pole piece 60, is centrally holed 62 and is arranged and fixed in abutment against the outer cylindrical wall 28.
  • the central hole 62 is just a little larger than the disc-shape magnetic armature 50 so the plunger 46 may reciprocally slide in the bore 36 without contacting the back plug 60.
  • the pumping part 18 is now described and best detailed on the magnified view of figure 3 . It is arranged in the cylindrical portion 26 of the backward body 14 and it comprises several pumping elements 66, the embodiment of figure 4 showing four identical pumping elements 66 but, as being identical just one will be described here after, the element 66 above in figure 1 .
  • the pumping element 66 comprises a cylindrical hole 68 radially extending along the vertical axis Z and, in the hole 68 is arranged a fixed sleeve 70.
  • the sleeve 70 is provided with an axial Z bore 72 that upwardly opens in a cylindrical upper chamber 74 of larger diameter than the bore 72, the intersection area forming a valve seat 76.
  • the upper chamber 74 is itself closed by a plug 78 and, in the upper chamber 74 is arranged a check valve 80 normally closed comprising a spring 82 soliciting a ball 84 against the valve seat 76.
  • the bore 72 downwardly opens in a cylindrical recess 86 and, in the bore 72 is slidably adjusted a cylindrical piston 88 that upward head 90 is flat and downward foot 92 radially extends in a shoulder 94 followed by a pointy conical end 96.
  • Another coil spring 98 arranged around the piston 88 is compressed in the recess 86 between the sleeve 70 and the shoulder 94 so permanently soliciting downwardly the piston 88.
  • the free volume of the bore 72 that is between the piston's head 90 and the ball 84 forms a dosing chamber 100.
  • the piston axis (Z) and the plunger axis (X) intersect at right angle.
  • the axis may not intersect and then may be angled at another angle than 90°.
  • the delivering part 22 is now described in reference to figure 1 taken from left to right.
  • the frontward body 20 comprises a disc flange wall 102 radially extending from the longitudinal axis X. Said flange 102 is bolted in surface contact against the large disc-flange 24 of the backward body 14.
  • Another O-ring seal 104 is arranged between the flanges 24, 102, to ensure perfect sealing. From the flange 102 frontwardly extends a conical portion 106 ending into a cylindrical portion 108.
  • the reagent R enters the dosing pump 12 via the central hole 62 provided in the outer pole piece 60.
  • the regent R then flows around the magnetic armature 50, on which the spring 59 seats, and via through holes operated in the magnetic armature 50 to get between the inner cylindrical wall 30 and the coil 34.
  • the reagent R does not wet the coil 34 or mix with surrounding coolant in contact with outer walls 28.
  • the reagent flows through a hole 110 longitudinally X extending through the wall and opening in the cylindrical radial hole 68 of the pumping part 18.
  • the sleeve 70 is provided on its external surface with a first undercut creating a first annular space 112 that is in fluid communication with the dosing chamber 100 via inlet channels 114.
  • Said inlet channels 114 extend through the sleeve 70.
  • the inlet channel 114 opens in the dosing chamber 100 just above the piston's head 90. From the dosing chamber 100, the reagent R can flow in the upper chamber 74 only when the check valve 80 opens.
  • the reagent R can exit through outlet channels 116 that radially extend through the sleeve 70 and open in a second undercut provided in the external surface of the sleeve 70 and forming a second annular space 118 surrounding the sleeve 70.
  • the first undercut 112 and the second undercut 118 are separated and delimited by three outer surface section that are in circumferential contact with the cylindrical hole 68 so, the reagent R flowing in the first annular space 112 has no other choice than going into the inlet channel 114.
  • the reagent R flows out via through holes 120 longitudinally X extending through the large disc flange 24.
  • the reagent R gets into a gallery 122 from which departs a connecting channel 124 centrally extending and focusing toward the longitudinal axis X.
  • said connecting channel 124 is formed in the conical portion 106 of the frontward body 20 and it merges into a main delivery channel 126 that longitudinally X extends in the middle of the cylindrical portion 108 of the frontward body 20 from which the reagent R exits the dosing pump 12.
  • the coil 34 is energized, the magnetic armature 50 is axially X attracted with a force superior to the force of the longitudinal spring 59 and the plunger 46 is longitudinally moved in a forward position PF. In doing so the frontward conical face 58 of the plunger 46 upwardly pushes the conical end 96 of the piston 88 that moves into an upward position PU. Similarly, the vertical spring 98 is further compressed. In moving up the piston's head 90 closes the inlet channel 114 and the reagent R trapped in the dosing chamber 100 is pressurized and it pushes up the ball 84 obliging the check valve 80 to open. The pressurized reagent R can flow around the ball 84 and find its way through the outlet channel 116 through to the delivery channel 126.
  • the volume of the dosing chamber 100 is fixed. As soon as the piston 88 moves up, the inlet channel closes. Therefore the volume of reagent R delivered is exactly the volume contained in the dosing chamber 100.
  • the upward movement of the piston is linked to the cone-cone contact.
  • Other slopped or spherical shape may provide a similar transmission of force between the plunger and the piston.
  • the conical profile at plunger tip can be adapted to allow two pump events per axial plunger stroke 46, as described earlier in the alternative embodiment, offering a further variation to achieve higher dosed output for given electrical frequency input.
  • the embodiment comprises four pumping element 66 arranged every 90°.
  • a major advantage of this dosing pump 12 is that within the same fixed volume delimited by the backward and frontward bodies 14, 20, different numbers of pumping elements 66 can be arranged.
  • dosing pump 12 may have a single pumping element 66.
  • Another embodiment may have two elements 66, or three, or four as presented on figure 4 . More than four is also possible depending on the quantity of reagent R needed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)
  • Reciprocating Pumps (AREA)

Claims (8)

  1. Dosierpumpe (12) eines selektiven katalytischen Reduktionssystems zum Liefern eines Reagens (R) in die Abgasleitungen, um mit den Abgasen chemisch zu reagieren, wobei die Dosierpumpe (12) einen Pumpteil (18) mit einem Körper (14, 20) aufweist, der mit einem Pumpelement (66) mit einer sich entlang einer Pumpachse (Z) erstreckenden Bohrung (72) versehen ist, in der ein Kolbenelement (88) angeordnet ist, wobei das Volumen der Bohrung (72) jenseits des Kolbens (88) eine Dosierkammer (100) definiert, wobei Öffnen eines Einlasses (114) und eines Auslasses (116) durch ein Ventil (80) gesteuert wird, wobei sich der Kolben (88) entlang der Pumpachse (Z) hin- und herbewegt zwischen einer unteren Position (PD), in der der Einlass (114) offen ist und das Reagens (R) die Kammer (100) füllt, und einer oberen Position (PU), in der der Einlass (114) geschlossen ist und das Ventil (80) offen ist, um das Reagens (R) aus der Kammer (100) strömen zu lassen, wobei die Pumpe (12) weiter einen pilotierten Aktuator (16) hat mit einem Stößel (46), der angeordnet ist zum Zusammenwirken mit dem Kolben (88), wobei der Aktuator (16) eine Spule (34) aufweist und an dem hinteren Ende (48) des Stößels (46) ein magnetischer Anker (50) befestigt ist, dadurch gekennzeichnet, dass sich der Stößel (46) entlang einer Stößelachse (X) hin- und herbewegt, die relativ zu der Kolbenachse (Z) abgewinkelt ist.
  2. Dosierpumpe (12) gemäß dem vorhergehenden Anspruch, wobei sich der Stößel (46) entlang der Stößelachse (X) hin- und herbewegt zwischen einer hinteren Position (PB), in der der Kolben (88) in der unteren Position (PD) ist, und einer vorderen Position (PF), in der der Kolben (88) in der oberen Position (PU) ist.
  3. Dosierpumpe (12) gemäß Anspruch 2, die weiter ein erstes elastisches Element (59), das den Stößel (46) permanent in Richtung der hinteren Position (PB) beeinflusst, und ein zweites elastisches Element (98) aufweist, das den Kolben (88) permanent in Richtung der unteren Position (PD) beeinflusst.
  4. Dosierpumpe (12) gemäß dem vorhergehenden Anspruch, wobei sich die Stößelachse (X) und die Pumpachse (Z) in einem rechten Winkel schneiden.
  5. Dosierpumpe (12) gemäß einem der vorhergehenden Ansprüche, wobei der Stößel (46) und der Kolben (88) komplementär geformte zusammenwirkende Enden (58, 96) haben, die so angeordnet sind, dass eine Verschiebung des Stößels (46) entlang der Stößelachse (X) eine Verschiebung des Kolbens (88) entlang der Kolbenachse (Z) erzeugt.
  6. Dosierpumpe (12) gemäß Anspruch 5, wobei die komplementär geformten zusammenwirkenden Enden (58, 96) des Stößels (46) und des Kolbens (88) geneigte Oberflächen sind.
  7. Dosierpumpe (12) gemäß einem der Ansprüche 5 oder 6, wobei die zusammenwirkenden Enden (58, 96) des Stößels (46) und des Kolbens (88) konische Oberflächen sind.
  8. Dosierpumpe (12) gemäß einem der vorhergehenden Ansprüche, die eine Vielzahl von Pumpelementen (66) aufweist, die relativ zu der Stößelachse (X) radial angeordnet sind, wobei der Stößel (46) mit allen Kolben (88) zusammenwirkt.
EP13175379.0A 2013-07-05 2013-07-05 Selektive katalytische Reduktionsdosierpumpe Active EP2821647B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13175379.0A EP2821647B1 (de) 2013-07-05 2013-07-05 Selektive katalytische Reduktionsdosierpumpe
PCT/EP2014/061202 WO2015000646A1 (en) 2013-07-05 2014-05-29 Selective catalytic reduction dosing pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13175379.0A EP2821647B1 (de) 2013-07-05 2013-07-05 Selektive katalytische Reduktionsdosierpumpe

Publications (2)

Publication Number Publication Date
EP2821647A1 EP2821647A1 (de) 2015-01-07
EP2821647B1 true EP2821647B1 (de) 2018-10-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13175379.0A Active EP2821647B1 (de) 2013-07-05 2013-07-05 Selektive katalytische Reduktionsdosierpumpe

Country Status (2)

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EP (1) EP2821647B1 (de)
WO (1) WO2015000646A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108678923B (zh) * 2018-05-04 2019-11-08 苏州欧圣电气股份有限公司 柱塞泵及清洗机
CN108730153B (zh) * 2018-05-04 2020-08-07 苏州欧圣电气股份有限公司 单柱塞式柱塞泵及手持式清洗机
CN108678944B (zh) * 2018-05-04 2019-09-20 苏州欧圣电气股份有限公司 柱塞泵及手持式清洗机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2160596A (en) * 1984-06-23 1985-12-24 Pitcraft Summit Ltd Pump

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006000831B4 (de) * 2006-01-05 2007-10-31 Siemens Ag Radialkolbenpumpe mit Fördermengenregelung
EP1878920B1 (de) * 2006-07-12 2011-06-08 Delphi Technologies Holding S.à.r.l. Dosierpumpe für eines Reduktionsmittels
DE102010039920A1 (de) * 2010-08-30 2012-03-01 Robert Bosch Gmbh Pumpe für ein Hochdrucksystem

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2160596A (en) * 1984-06-23 1985-12-24 Pitcraft Summit Ltd Pump

Also Published As

Publication number Publication date
EP2821647A1 (de) 2015-01-07
WO2015000646A1 (en) 2015-01-08

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