EP2225466A1 - Fluidfördereinrichtung und ventileinrichtung sowie verfahren zum betreiben einer fluidfördereinrichtung - Google Patents
Fluidfördereinrichtung und ventileinrichtung sowie verfahren zum betreiben einer fluidfördereinrichtungInfo
- Publication number
- EP2225466A1 EP2225466A1 EP08855348A EP08855348A EP2225466A1 EP 2225466 A1 EP2225466 A1 EP 2225466A1 EP 08855348 A EP08855348 A EP 08855348A EP 08855348 A EP08855348 A EP 08855348A EP 2225466 A1 EP2225466 A1 EP 2225466A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluid
- valve
- compression space
- fluid port
- check valve
- 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
- 239000012530 fluid Substances 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims description 5
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 230000006835 compression Effects 0.000 claims description 55
- 238000007906 compression Methods 0.000 claims description 55
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 230000002441 reversible effect Effects 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims description 2
- 230000002123 temporal effect Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 5
- 230000008014 freezing Effects 0.000 abstract description 2
- 238000007710 freezing Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 6
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
-
- 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
- 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
- F04B53/1037—Flap valves
- F04B53/1047—Flap valves the valve being formed by one or more flexible elements
- F04B53/105—Flap valves the valve being formed by one or more flexible elements one flexible element oscillating around a fixed point
-
- 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
- F04B53/108—Valves characterised by the material
- F04B53/1082—Valves characterised by the material magnetic
-
- 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
- F04B2201/00—Pump parameters
- F04B2201/06—Valve parameters
-
- 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
- F04B2205/00—Fluid parameters
- F04B2205/09—Flow through the pump
Definitions
- fluid conveying devices for feeding a fluid, for example a urea-water solution, into the exhaust gas of an internal combustion engine. With the injected solution pollutants in the exhaust gas of the internal combustion engine to be reduced in a subsequent catalyst.
- the pump of the fluid delivery device sucks the fluid from a fluid reservoir and pumps it to the injection valve via which the fluid is injected into the exhaust line of the internal combustion engine. Because the fluid, for example the urea-water solution, solidifies below a freezing temperature, if there is a risk that this temperature may be exceeded, the fluid must be sucked out of the line leading to the injection valve.
- an additional 4/2-way switching valve can be provided, so that when the directional control valve is switched, the fluid is sucked out of the line leading to the injection valve and transported back into the fluid reservoir.
- the additional switching valve requires a significant additional construction costs.
- the pump of the fluid delivery device for example, a diaphragm pump, as shown in German Utility Model DE 296 20 094 Ul.
- the fluid delivery device according to the invention with a pump and the valve device according to the invention for a pump and the method according to the invention for operating a fluid delivery device have the advantage that it is only a small, easily executable modification of the pumping chamber with an oscillating enlarging and decreasing compression space on the inlet side and outlet side in any case Needed check valves needed to operate the pump both in a conveying direction and in a direction opposite to the conveying direction return direction.
- the proposed embodiment has the advantage that an otherwise required for a return pumping changeover valve can be saved. Because no additional switching valve is required, there is a reduced construction cost, a smaller volume and a smaller weight compared with previously known designs.
- non-return valves have a closing body which controls the inlet and outlet to the compression space both in the conveying direction and in the return conveying direction, this has the advantage of an additional reduction of the building outlay.
- FIGS. 1A and 1B show a fluid conveying device in different switching positions
- FIG. 2 shows an exploded view of the valve device
- FIG. 3 shows a plan view of the valve device
- FIGS. 4A and 4B a section through the valve device in different
- FIGS. 1A and 1B symbolically show a preferably selected, particularly advantageous embodiment of a fluid delivery device 2.
- the fluid delivery device 2 serves to convey a fluid, wherein the fluid can be a liquid or a gas or a gas mixture.
- the fluid delivery device 2 serves, for example, for feeding a fluid into an exhaust gas line 18 of an internal combustion engine, not shown.
- the fluid is, for example, a urea-water solution, in particular a 32% urea-water solution. With the injected solution pollutants are to be reduced in the exhaust gas of the internal combustion engine in a subsequent catalyst, not shown.
- the fluid delivery device 2 comprises a fluid reservoir 4, a pump 6 and an injection valve 8.
- a fluid line 10 leads from the fluid reservoir 4 through the pump 6 to the injection valve 8.
- the portion of the fluid line 10 between the fluid reservoir 4 and the pump 6 is hereinafter referred to as the first line piece eleventh designated.
- the part of the fluid line 10 between the pump 6 and the injection valve 8 is hereinafter referred to as the second line piece 12.
- From the second line section 12 of the fluid line 10 branches off a discharge line 14, which leads to the fluid reservoir 4.
- a pressure limiting valve 16 and a throttle valve 16 is provided in the discharge line 14.
- the injection valve 8 is located on the exhaust pipe 18 of the not shown
- the fluid line 10 leads through the injection valve 8 in the exhaust pipe 18th
- a fluid delivery device 2 is disclosed in which, despite the smallest possible construction cost, such a possibility is achieved.
- the pump 6 has a pump housing 6g.
- the pump housing 6g is symbolically indicated in the figures IA and IB with dash-dotted lines.
- the pump 6 has a compression space 20 in the pump housing 6g and a first fluid port 21 and a second fluid port 22 on its pump housing 6g.
- the first conduit 11 of the fluid conduit 10 connects the first fluid port 21 to the fluid reservoir 4.
- the second conduit 12 of the fluid conduit 10 connects the second fluid port 22 to the injection valve 8.
- the pump 6 has a compression chamber 20 limiting working wall 24 and an oscillating pump drive 26.
- the pump drive 26 is for example an eccentric or a clocked energized electromagnet. When working pump drive 26 makes the working wall 24 reciprocating strokes. This leads to an alternately increasing and decreasing compression space 20.
- the working wall 24 is, for example, a reciprocating or an upwardly and downwardly moving piston or the working wall 24 is, for example, a rubber-elastic membrane which can be moved by means of the pump drive 26.
- the working wall 24 is, for example, such a membrane as that of the published by the German utility model DE 296 20 094 Ul drawing can be removed.
- valve device 30 Integrated into the pump housing 6g or attached to the pump housing 6g is a valve device 30.
- the valve device 30 has a valve housing 30g symbolized symbolically in FIGS. 1A and 1B by dash-dotted lines.
- the valve housing 30g may be flanged to the pump housing 6g.
- Valve device 30 can also be installed directly in the pump housing 6g.
- the valve device 30 comprises a first check valve 31, a second check valve 32 and a controller 34.
- the actuator 34 can be controlled by a switch or by a control device.
- the actuator 34 is used to switch the valve device 30.
- the actuator 34 is, for example, pneumatic or electric controllable. In the preferred embodiment selected, the actuator 34 is an electromagnet and will be referred to as a magnet 34 in the description for simplicity's sake.
- the first check valve 31 has a first valve seat 31a, a second valve seat 31b and a closing body 31c.
- the second check valve 32 has a first valve seat 32a, a second valve seat 32b, and a closing body 32c.
- the first valve seat 31a of the first check valve 31 is hydraulically in communication with the fluid reservoir 4 via the first fluid port 21.
- the second valve seat 31b of the first check valve 31 is hydraulically in communication with the compression space 20.
- the first valve seat 31a of the first check valve 31 communicates with the first fluid port 21, and in turn communicates with the fluid reservoir 4.
- the second valve seat 31b of the first check valve 31 communicates with the compression space 20.
- the first valve seat 32a of the second check valve 32 is hydraulically in communication with the compression space 20.
- the second valve seat 32b of the second check valve 32 is hydraulically in communication with the second fluid port 22, to which the injection valve 8 is connected via the second line section 12 of the fluid line 10 ,
- the first valve seat 32 a of the second check valve 32 communicates with the compression space 20.
- the second valve seat 32 b of the second check valve 32 communicates with the injection valve 8 via the second fluid connection 22 and the second line section 12.
- the fluid contained in the fluid reservoir 4 is sucked through the first line section 11 of the fluid line 10 through the first fluid port 21 and through the first check valve 31 into the compression space 20. Due to the negative pressure in the compression space 20, the closing body 31c lifts off from the first valve seat 31a, so that the fluid can flow into the compression space 20 via the first fluid connection 21.
- the closing body 31c closes the first valve seat 31a of the first check valve 31, so that no fluid can flow from the compression space 20 to the first fluid port 21 during a pressure stroke.
- the closing body 32c of the second check valve 32 lifts off from the first valve seat 32a, so that the fluid from the compression space 20 through the second check valve 32, through the second fluid port 22 into the second line piece 12 of the fluid line 10 to inject valve 8 are conveyed can.
- the first check valve 31 permits a flow direction 41A from the first fluid port 21 through the first check valve 31 into the compression space 20, and the second check valve 32 permits a second flow direction 42A from the first
- the check valves 31, 32 of the valve device 30 When energized solenoid 34, the check valves 31, 32 of the valve device 30 are in the switching position shown in the figure IB.
- the elasticity 31d biases the closing body 31c of the first check valve 31 elastically against the second valve seat 31b, and the elasticity 32d urges the closing body 32c of the second check valve 32 against the second valve seat 32b.
- the first check valve 31 ensures that the first flow direction 41 B is directed from the compression space 20 through the first check valve 31 to the first fluid port 21, and the second check valve 32 ensures that the second flow direction 42 B from the direction of the second fluid port 22 is directed through the second check valve 32 in the compression chamber 20.
- the pump 6 When energized magnet 34, the pump 6 sucks the fluid from the direction of the injection valve 8 from the second line piece 12 in the flow direction 41 B and 42 B and promotes the fluid through the first line piece 11 in the fluid reservoir 4. When doing the injection valve 8 is fully or partially open, Air or exhaust gas passes through the injection valve 8 in the fluid line 10.
- the pump 6 can be operated in the switching position of the valve device 30 shown in FIG IB until the gas flowing through the injector 8, the liquid from the pipe sections 11, 12 and from the pump 6 has completely pushed back into the fluid reservoir 4.
- FIG. 2 shows an exploded view of the valve device 30.
- FIG. 3 shows a sectional view along the sectional plane marked IV-IV in FIG FIG. 4B shows the same sectional plane when the valve device 30 is in the second switching position.
- FIG. 5A shows a section along the sectional plane marked V - V in FIG. 3, in the first switching position
- FIG. 5B shows the same sectional plane when the valve device 30 is in the second switching position.
- Figures IA, 4A and 5A show the valve device 30 in its first switching position.
- the resulting symbolized by the arrows 41A and 42A flow direction can be referred to as normal conveying direction.
- Figures IB, 4B and 5B show the valve device 30 in its second switching position.
- the resulting by the arrows 41 B and 42 B symbolized opposite flow direction can be referred to as a return direction.
- the closing body 31c of the first check valve 31 is formed on a plate 31p. In the plate 31p, it has a U-shaped cutout, so that a kind of tongue 31z stops.
- the integrally formed closing body 31c is located at the end of the elastically bendable tongue 31z.
- the second check valve 32 is similarly constructed.
- the closing body 32c of the second check valve 32 is located on a plate 32p, on which a tongue 32z is formed by punching. At the end of the elastically bendable tongue 32z is the closing body 32c.
- the plate 31p is installed in the valve housing 30g and is held in the valve housing 30g by an intermediate plate 44 and a cover plate 46.
- the plate 32p of the second check valve 32 is fixed by a closure plate 48 in the housing 30g.
- valve seat 31a is located on the intermediate plate 44, the valve seat 31b on the valve housing 30g, the valve seat 32a on the closure plate 48, and the valve seat 32b on the valve housing 30g.
- the plate 31p of the first check valve 31 is installed and fixed in the valve housing 30g so that, when the magnet 34 is not actuated, the closing body 31c is biased against the valve seat 31a due to the elasticity of the tongue 31z with elastic bias.
- the plate 32p of the second check valve 32 is installed in the valve housing 30g such that when the magnet 34 is not actuated, the closing body 32c due to the elasticity of the tongue 32z is biased with elastic bias against the valve seat 32a. See Figs. 4A and 5A.
- the magnet 34 has a magnetic core 34a and a magnetic coil 34b (Figs. 5A and 5B).
- FIGS. 4A and 5A show the valve device 30 in the switching position when the magnet 34 is not energized
- FIGS. 4B and 5B show the switching position when the magnet 34 is energized.
- Compression space 20 are reversed.
- the second flow direction 42A or 42B can also be reversed between the compression space 20 and the second fluid connection 20.
- Valve device 30 designed so that when not energized magnet 34 at working Working wall 24, the fluid is pumped from the fluid reservoir 4 to the injection valve 8 and that when energized magnet 34, the pump 6 transports the fluid from the fluid line 10 back into the fluid reservoir 4. It should be noted, however, that the valve device 30 can also be embodied in such a way that, when the magnet 34 is energized, the pump 6 pumps out of the fluid reservoir 4 to the injection valve 8 and if the magnet is not energized the pump 6 conveys the fluid out of the fluid line 10 back into the fluid reservoir 4.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Reciprocating Pumps (AREA)
- Reciprocating Pumps (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007057446A DE102007057446A1 (de) | 2007-11-29 | 2007-11-29 | Fluidfördereinrichtung und Ventileinrichtung sowie Verfahren zum Betreiben einer Fluidfördereinrichtung |
| PCT/EP2008/066094 WO2009068506A1 (de) | 2007-11-29 | 2008-11-24 | Fluidfördereinrichtung und ventileinrichtung sowie verfahren zum betreiben einer fluidfördereinrichtung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2225466A1 true EP2225466A1 (de) | 2010-09-08 |
| EP2225466B1 EP2225466B1 (de) | 2011-10-12 |
Family
ID=40451352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08855348A Active EP2225466B1 (de) | 2007-11-29 | 2008-11-24 | Fluidfördereinrichtung und ventileinrichtung sowie verfahren zum betreiben einer fluidfördereinrichtung |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2225466B1 (de) |
| AT (1) | ATE528510T1 (de) |
| DE (1) | DE102007057446A1 (de) |
| WO (1) | WO2009068506A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009055375A1 (de) | 2009-12-29 | 2011-06-30 | Robert Bosch GmbH, 70469 | Pumpe zum Fördern von Fluiden in eine Förder- und eine Rückförderrichtung |
| DE102010029600A1 (de) | 2010-06-01 | 2011-12-01 | Robert Bosch Gmbh | Dosiersystem zum Eindosieren eines Reduktionsmittels in den Abgasstrang eines Kraftfahrzeuges |
| DE102011088679A1 (de) * | 2011-12-15 | 2013-06-20 | Robert Bosch Gmbh | Pumpeinheit |
| DE102018208112A1 (de) | 2018-05-23 | 2019-11-28 | Robert Bosch Gmbh | Fluidfördereinrichtung für ein gefrierfähiges Fluid, Dosiersystem sowie Verfahren zum Betreiben einer Fluidfördereinrichtung |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191220602A (en) * | 1912-09-10 | 1913-04-17 | Norman Dickson | Improvements in connection with Valves for Pumps. |
| US2299448A (en) * | 1940-01-16 | 1942-10-20 | Zwicky Jean | Pump and filter therefor |
| SE504043C2 (sv) * | 1995-02-06 | 1996-10-21 | Carl Goeran Hellstroem | Kolvpump samt backventilarrangemang för en dylik kolvpump |
| DE29620094U1 (de) | 1996-11-20 | 1998-03-26 | Knf-Neuberger Gmbh, 79112 Freiburg | Membranpumpe |
| DE19946902A1 (de) * | 1999-09-30 | 2001-04-05 | Bosch Gmbh Robert | Vorrichtung zum Nachbehandeln von Abgasen einer Brennkraftmaschine |
| DE102004002078A1 (de) | 2004-01-15 | 2005-08-18 | Knf Flodos Ag | Ventil |
-
2007
- 2007-11-29 DE DE102007057446A patent/DE102007057446A1/de not_active Withdrawn
-
2008
- 2008-11-24 AT AT08855348T patent/ATE528510T1/de active
- 2008-11-24 WO PCT/EP2008/066094 patent/WO2009068506A1/de not_active Ceased
- 2008-11-24 EP EP08855348A patent/EP2225466B1/de active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009068506A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE528510T1 (de) | 2011-10-15 |
| EP2225466B1 (de) | 2011-10-12 |
| DE102007057446A1 (de) | 2009-06-04 |
| WO2009068506A1 (de) | 2009-06-04 |
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