EP2748439B1 - Dosiersystem für ein flüssiges reduktionsmittel - Google Patents

Dosiersystem für ein flüssiges reduktionsmittel Download PDF

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Publication number
EP2748439B1
EP2748439B1 EP12733139.5A EP12733139A EP2748439B1 EP 2748439 B1 EP2748439 B1 EP 2748439B1 EP 12733139 A EP12733139 A EP 12733139A EP 2748439 B1 EP2748439 B1 EP 2748439B1
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EP
European Patent Office
Prior art keywords
pump
valve
pressure
diaphragm
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.)
Active
Application number
EP12733139.5A
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German (de)
English (en)
French (fr)
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EP2748439A1 (de
Inventor
Ewgenij Landes
Peter Boehland
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2748439A1 publication Critical patent/EP2748439A1/de
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    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/12—Combinations of two or more pumps the pumps being of different types at least one pump being of the rotary-piston positive-displacement type
    • 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
    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1466—Means for venting air out of conduits or tanks
    • 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
    • F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
    • 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
    • F01N2610/1493—Purging the reducing agent out of the conduits or nozzle
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type

Definitions

  • an SCR catalytic converter is often provided in the exhaust system in order to meet the environmental requirements.
  • liquid urea or a liquid urea-water solution (reducing agent) must be injected into the exhaust line upstream of the SCR catalyst.
  • a metering system comprising a tank, a pump and a metering module, which operates in a manner similar to the injector of a fuel injection system, is used.
  • the pump is also referred to as a delivery module.
  • the task of the delivery module or the pump is to suck urea-water solution from a tank and build up a sufficient pressure on the pressure side, so that the liquid urea-water solution is finely atomized as soon as the dosing opens demand-controlled.
  • the injector like the delivery module, is connected to a control unit of the internal combustion engine and is opened and closed by it as required. The same applies to the operation of the feed pump. Since urea-water solution has the property of freezing at low temperatures and increasing its volume by about 11%, measures must be taken to prevent damage to the dosing system by freezing urea-water solution.
  • the pump is designed with a reversible conveying direction or a valve is provided for reversing the conveying direction of the pump.
  • Partial aeration of the metering system produces a compressible air bubble, so that when the remaining residues of the reducing agent in the metering system freeze, the resulting ice pressure is so low that no damage to the metering system occurs.
  • a 4/2-way valve is prone to failure and expensive.
  • the WO 2004/047963 describes a device for removing a reducing agent with a compressed air pump.
  • the DE 10 2009 029 408 discloses a method for monitoring an SCR catalyst system.
  • the WO 2012/093051 shows a conveyor for supplying an exhaust aftertreatment system having two pumps.
  • the metering system according to the invention according to claim 1 is characterized in that it is very inexpensive and ensures a reliable emptying or ventilation of the metering after switching off the internal combustion engine. Because the ventilation pump according to the invention only serves to aerate or empty the dosing system, a very low flow rate is sufficient. Also, only low demands are placed on the delivery pressure of the ventilation pump. As a result, the ventilation pump according to the invention is less expensive than a 4/2-way valve. In addition, such a pump is less prone to failure than a switchable 4/2-way valve.
  • the feed pump according to the invention and / or the ventilation pump according to the invention are preferably designed as diaphragm pumps.
  • the invention is not limited to diaphragm pumps. Other types known in the art may also be used.
  • the feed pump according to the invention and / or the venting pump is driven by an electromagnetic (linear) actuator, which is also referred to as a lifting magnet. Then namely, can be dispensed with an implementation of the rotational movement of an electric motor, for example in an oscillating conveying movement of the pump.
  • the direct drive of the diaphragm pump via an electromagnetic actuator allows to easily and inexpensively detect the injected amount of the reducing agent over the stroke of the actuator very accurately.
  • the stroke of the actuator is a direct measure of the amount of reducing agent delivered. Therefore, it is possible to dispense with a separate pressure sensor without degrading the metering accuracy of the metering system according to the invention.
  • a check valve can be provided in each case on the suction side and / or the delivery side of both pumps.
  • a throttle or a diaphragm is provided on the suction side and / or the delivery side of the feed pump and / or the venting pump.
  • a check valve is provided both on the suction side, as well as on the delivery side.
  • a second check valve is provided on the suction side of the aeration pump parallel to the first check valve, wherein the reverse direction of the second check valve is opposite to the reverse direction of the first check valve.
  • the ventilation pump is used during operation of the feed pump as a pressure compensation element. Namely, if in the pressure line such a high pressure prevails that it opens the first check valve on the suction side of the venting pump, then the high pressure from the pressure line acts on the membrane of the venting pump. This membrane can yield to this pressure by expanding towards the electric actuator. As a result, the volume on the pressure side of the metering system according to the invention increases and the pressure peak is reduced.
  • the pressure-side check valve in the ventilation line so that it opens when an inadmissibly high pressure in the pressure line occurs and thus a portion of the pumped from the feed pump urea water solution from the pressure line flows back into the suction line.
  • an effective pressure limitation is also achieved. Again, no additional costs are required.
  • a throttle or a diaphragm is provided on the pressure side of the ventilation pump parallel to the check valve.
  • a particularly advantageous embodiment of the invention provides that in a diaphragm pump, the membrane vent line on the pressure side or the suction side of the venting pump closes when the actuator is de-energized.
  • the ventilation pump according to the invention assumes the function of a switchable directional valve without additional expenditure of components. This is possible because the conveying work, ie when the membrane presses reducing agent from the pumping chamber into the venting line, from one to the membrane acting spring is done. This spring is biased by the electromagnetic actuator during the suction stroke of the feed pump.
  • a cross-sectional constriction in the housing can be provided. This cross-sectional constriction may be formed simultaneously as a throttle or aperture.
  • the ventilation pump is integrated in the feed pump. This not only has advantages in terms of the hydraulics of the dosing system, but also has the advantage that the signal lines for controlling both pumps can be guided together into the housing.
  • the ventilated pumping chamber of the venting pump which serves as a compensating volume for the reducing agent in the pump, is in the immediate vicinity of the pump and thus the pressure equalization between the two pumps is very possible ,
  • At least one capacitor is present, so that the electrical charge stored in the capacitor can be used to energize the electric actuator of the ventilation pump. Since a capacitor can deliver the electrical charge stored in it very quickly, it is possible to act on the actuator of the ventilation pump very quickly and with large currents in an emergency, so that the membrane is suddenly raised and a very rapid suction of liquid reducing agents through the Ventilation pump takes place. Through this dynamic suction process, a so-called impulse back suction of liquid reducing agent takes place. This pulse back suction is ultimately nothing more than exploiting the elasticity of the pressure line and the liquid reducing agent pressurized therein.
  • the pressure line In the case of a sudden drop in pressure, the pressure line, as it were, springs together and thereby promotes a small amount of liquid reducing agent in the direction of the ventilation pump. This results in that at least a portion of the pressure line, but also the metering module is no longer filled with liquid reducing agent, but with air or exhaust gases. This has reduced the risk of ice pressure damage.
  • a further advantageous embodiment of the metering system according to the invention provides that the feed pump and / or the aeration pump comprises an electric actuator with a magnet and an armature, a diaphragm, a valve-membrane plate and a valve plate, and that between the Valve diaphragm plate and the valve plate is a rubber plate as a valve element and sealing element is present.
  • the non-return valves according to the invention and / or throttles can be produced in the simplest and most cost-effective manner.
  • an additional check valve to provide only an additional breakthrough in the valve plate and provide corresponding recesses acting as a valve element rubber plate.
  • valve diaphragm plate and the diaphragm of the ventilation pump together with the electric actuator form a controllable shut-off valve. Again, no significant additional manufacturing costs are required.
  • a valve disc is formed on the armature, which works together with a sealing bead of the valve diaphragm plate as a switchable way or check valve. Furthermore, it is provided that the membrane is arranged offset in the stroke direction to the valve disk on the armature. This makes it possible, on the one hand, the pressure prevailing in the pumping chamber to some extent acts on the back of the valve disk and thus presses it against the sealing seat in the valve diaphragm plate. This increases the tightness. At the same time it is possible that the membrane evades in the stroke direction and thus degrades a pressure peak. Thus, the membrane can work as a pressure compensation element.
  • FIG. 1 a dosing system is shown as a block diagram.
  • a tank 1 is liquid reducing agent (urea-water solution).
  • a feed pump 5 sucks liquid reducing agent from the tank as required and conveys it via a pressure line 7 to a metering module 9.
  • suction line 3 and pressure feed line 7 refer to the
  • the dosing module 9 can be represented in the block diagram as a combination of a throttle 11 and a switchable 2/2-way valve 13.
  • the directional control valve 13 is closed in the de-energized state. Then no liquid reducing agent is injected into the exhaust system of the internal combustion engine (not shown).
  • the directional control valve 13 can be opened by the engine control unit (not shown), so that liquid reducing agent is atomized by the throttle 11 in the metering module 9 and finely distributed is injected into the exhaust pipe of the internal combustion engine.
  • a ventilation pump 15 according to the invention is provided parallel to the feed pump, but with opposite conveying direction.
  • check valve 17, 19 On the suction side and the delivery side of the feed pump 5, a check valve 17, 19 is provided in each case.
  • check valves 21 and 23 are also provided on the suction side and the pressure side of the aeration pump 15. Since the conveying directions of the feed pump 15 and the venting pump 15 are opposite, the locking directions of the check valves 17, 19 and 21, 23 are directed opposite.
  • the ventilation pump 15 is hydraulically integrated via a ventilation line 25 in the suction line 3 and the pressure line 7 of the feed pump 5.
  • the suction-side section of the ventilation line with respect to the ventilation pump 15 25 has the reference numeral 25.1
  • the reference to the ventilation pump 15 pressure-side portion of the vent line 25 has the reference numeral 25.2
  • FIG. 2 the dosing system is shown in the aeration mode.
  • the feed pump 5 is out of operation and the aeration pump 15 promotes liquid reducing agent from the metering module 9 in the tank 1 back.
  • the ventilation pump 15 In order for the ventilation pump 15 to be able to ventilate the dosing module 9 as well as a part of the pressure line 7, the 2/2-way valve 13 of the dosing module 9 is opened. This switch position is in FIG. 2 shown.
  • the directional control valve 13 of the metering module 9 are closed again and the aeration pump 15 is turned off.
  • both the dosing module 9 and parts of the pressure line 7, the ventilation line 25 and the aeration pump 15 are filled with air or exhaust gas.
  • the still filled with liquid reducing agents areas of the dosing namely especially the feed pump 5, the suction line 3 and a portion of the pressure line 7, the aforementioned air-filled areas are available as a compensating volume when the reducing agent freezes.
  • the forces arising during the freezing of the reducing agent are reduced so much that no damage to the feed pump 5 or the lines 3, 7 are to be feared more. This is especially true when the feed pump 5 and the venting pump 15 are arranged in a common housing.
  • FIG. 3 a second dosing system is shown.
  • the venting pump 15 designed as a diaphragm pump is designed so that whenever the venting pump is de-energized, the membrane of the venting pump 15 closes the venting line 25.
  • This is represented by a switchable directional control valve 26.
  • the section 25.2 of the vent line 25 is closed, although the directional control valve 26 is located in the section 25.1.
  • the ventilation pump 15 thus additionally has the function of a controlled shut-off valve 26. Because this no additional components are needed, this additional functionality is achieved at no extra cost.
  • the use of the feed pump as a controlled shut-off valve 26 has the advantage that by appropriate design of the cross-section of the vent line 25, this can be sealed with a very low spring pressure acting on the membrane spring. This eliminates the need to design one of the two check valves 21, 23 in the ventilation line so that they are still tight relative to the operating pressure of the feed pump 5.
  • the opening pressure of the check valves 21 and 23 should be as low as possible because the electromagnetic actuator of the venting pump 15 must overcome the opening pressure at each stroke. The lower the opening pressure, the smaller and lighter the actuator can be made. Therefore, when using the diaphragm of the ventilation pump 15 as an additional shut-off valve, not only the opening pressure of the check valves 21, 23 can be reduced, but the electromagnetic actuator of the ventilation pump 15 can be made smaller, which saves costs and installation space. In addition, this also reduces the electrical energy required for the drive of the ventilation pump 15th
  • a suction throttle 27 is provided. Since the suction throttle 27 ultimately consists essentially only of a cross-sectional constriction in the ventilation line 25, thereby the number of required components is further reduced, which has a positive effect on the manufacturing costs and the robustness of the metering system according to the invention.
  • the check valve 23 can be replaced on the pressure side of the venting pump 15 by a delivery throttle 29. It is important, however, that at least one check valve is present in the ventilation line 25.
  • the membranes of the feed pump 5 and the venting pump 15 can be driven not only by an electromagnetic actuator, but also by an electric motor. It can also be another pump principle such. B. a piston pump, a gear pump, a vane pump u. a. be used more.
  • check valves 17, 19, 21 and / or 23 can be loaded as required and design with spring elements, so that their opening pressure is adjustable by the biasing force of the springs within wide limits. You can as in the embodiments according to FIGS. 4 and 5 partially replaced by throttles.
  • any necessary filters in the suction side 3, the pressure line 7 and / or the vent line 25 are partially required in practical applications, but not shown for reasons of clarity.
  • an additional electric heater can be installed. However, in many cases this is not necessary because the waste heat of the pump drive is generally sufficient to prevent the metering system from freezing. Of course, this does not apply to the liquid reducing agent in the tank 1.
  • a heater is required at least for thawing the frozen reducing agent (not shown).
  • the feed pump 5 is designed as a diaphragm pump and can in a similar manner as with reference to the FIG. 3 explained, can also be used as a switchable shut-off valve 28. Therefore, in this regard, in connection with the aeration pump 15 in FIG. 3 Said directed.
  • FIG. 7 is a block diagram of another dosing system.
  • a second check valve 31 is provided in this parallel to the first check valve 21 on the suction side of the aeration pump 15.
  • the blocking directions and the passage directions of the check valves 21 and 31 are opposite.
  • the check valve 23 opens on the pressure side of the aeration pump 15 and thus part of the conveyed by the pump 5 liquid from the pressure line 7 is returned to the suction line 3 , This also causes a pressure reduction to permissible values or a pressure limitation.
  • the system according to the invention is very robust and takes no damage even when impermissibly high pressures occur.
  • This negative pressure in the delivery room can only be overcome by a very strong electric actuator.
  • the throttle according to the invention ensures that a pressure equalization can take place between the delivery chamber of the aeration pump 15 and the suction line 3 when negative pressure prevails in the delivery chamber.
  • the drive power of the electric actuator can be reduced, which has a positive effect on space requirements and weight of the electric actuator. Further details can be found in the FIGS. 14-16 and their descriptions.
  • FIG. 9 a longitudinal section through a venting pump 15 is shown.
  • the electric actuator 35 essentially comprises an electromagnet 37 and an armature 39. Between the magnet 37 and the armature 39, a spring 41 is present, which the armature 39 in the FIG. 9 pressed to the left against a membrane 43.
  • the membrane 43 is sealingly clamped on the outside with a bead 44 in the housing 47 of the ventilation pump 15, so that in FIG. 9 right of the membrane 43 is no liquid.
  • a delivery chamber 45 of the aeration pump 15 is formed in the housing 47.
  • the connections of the sections 25.1 and 25.2 of the ventilation line 25 are indicated in addition to the delivery chamber 45.
  • the ventilation pump 15 according to the invention according to the embodiment of FIG. 9 at the same time a controllable directional control valve which closes the connection 25.2 of the ventilation line 25 when the actuator 35 is switched off.
  • This functionality requires no additional components. It is achieved by a clever design and tuning of the diaphragm 43, the pump housing or the sealing seat 49 and the electric actuator 35. This results in no additional costs in the production.
  • FIG. 10 Another example of ventilation is also shown partially in section.
  • a sandwich-like construction of the ventilation pump 15 is clearly visible. From top to bottom connects to the armature 39, the membrane 43 with its bead 44 and a valve-diaphragm plate 51 at.
  • a valve plate 53 is formed, which is molded with rubber or a similar elastic material.
  • the membrane 43 is made of the same rubber material and is positively connected to the armature 39.
  • valve disk 53 there is a certain distance between the valve disk 53 and the membrane 43 in the axial stroke direction of the armature 39, so that the pressure prevailing in the pumping chamber 45 also in FIG. 10 acts "from above” on the valve plate 53. As a result, the pressure prevailing in the delivery chamber 45 simultaneously acts as a hydraulic closing force, which presses the valve disk 53 against the sealing seat 49 in the valve membrane plate 51.
  • the membrane 43 is wave-shaped in cross-section. As a result, the membrane 43 becomes more elastic and can thus yield more easily when the pressure in the delivery chamber 45 increases. Then the membrane 43 gives in FIG. 10 upward in the direction of the armature 39 until it abuts the armature 39. This ensures that even with the occurrence of extremely large excess pressures in the delivery chamber 45, the membrane 43 does not tear.
  • valve diaphragm plate 51 In the valve diaphragm plate 51 are still more connections, namely the port 25.1 and a port 25.3 visible.
  • the pressure-side outlet 25.2 of the ventilation pump 15 is in FIG. 10 obscured by the valve plate 53.
  • the port 25.3 provides the hydraulic connection to the second check valve 31 (see FIG. FIG. 7 ) ago, when the inventive Ventilation pump 15 is still used at the same time as a pressure compensation element.
  • FIG. 11 shows a detail of FIG. 10 further enlarged and supplemented by a valve plate 57 and a rubber plate 55.
  • a rubber plate 55 and a valve plate 57 are arranged below the valve diaphragm plate 51.
  • the valve diaphragm plate 51, the rubber plate 55 and the valve plate 57 form below the port 25.1, the check valve 21, the reverse direction in FIG. 11 runs from top to bottom.
  • the passage direction is indicated by an arrow 59.
  • dashed line To clarify which portions of the components 51, 55 and 57 form the check valve 21, these portions are enclosed by a dashed line.
  • a circumferential ridge 61 is formed, which cooperates with a corresponding web 63 of the valve-diaphragm plate 51 so that it clamps the rubber plate 55 sealing.
  • a sealing seat 65 is formed in the valve plate 57, on which the rubber plate 55 rests when the check valve 21 is closed.
  • the sealing seat 65 and the web 61 together with the rubber plate 55 define an annular channel 67.
  • a plurality of arc-shaped openings 69 are recessed in the rubber plate 55.
  • the second check valve 31 has the same structure but the opposite passage direction. Therefore, the annular channel 73 and the sealing seat 75 are disposed in the valve-membrane plate 51.
  • the sealing seat 75 of the second check valve 31 is smaller than the diameter of the sealing seat 65 of the first check valve 21.
  • the opening pressure of the two check valves 21 and 31 can be adjusted , As already related to the FIG. 7 has been explained, it is advantageous if the opening pressure of the second check valve 31 is higher than that of the first check valve 21, which is structurally implemented by the smaller diameter of the sealing seat 75.
  • FIG. 12 is a side view of the example according to FIG. 11 shown.
  • the check valve 23, which connects the delivery chamber 45 with the pressure-side section 25.2 of the ventilation line 25, can be clearly seen.
  • the passage direction of the check valve 23 is indicated by an arrow 79. Again, the same structure is recognizable.
  • an outer sealing seat 49.2 and an inner sealing seat 49.1 are formed in the valve diaphragm plate 51, on which the valve plate 53 rests when the actuator 35 is de-energized, so that a particularly good sealing of the pumping chamber 45 to the pressure side of
  • Ventilation pump 15 takes place.
  • the inner sealing bead 49.1 results in a leakage-free sealing possible by the spring 41 applied closing forces. This is especially important if the vehicle is turned off and full running of the pressure line 7 and / or the dosing and / or the exhaust system to be safely prevented without the spring 41 and thus the magnet 37 must be larger than absolutely necessary.
  • valve-membrane plate 51 In the valve-membrane plate 51, a sealing seat 81 and an annular channel 83 is formed, which forms the check valve 23 together with the rubber plate 55. In this illustration, it is easy to see how the valve plate 53 cooperates with the sealing seat 49 and thereby relieves the second check valve 23.
  • FIG. 12 is also good to see that the magnet 37 has a toroidal recess which limits the stroke or the elastic deformation of the membrane 43. As a result, damage to the membrane 43 in the event of inadmissibly high pressures in the delivery chamber 45 can be avoided.
  • a shoulder 85 on the armature 39 on the one hand serves to support the compression spring 41 on the armature, on the other hand, this shoulder 85 can serve to guide the armature 39 in the magnet 37.
  • the check valve 23 has the largest bore, so that it opens at a small overpressure in the delivery chamber, if not the valve plate 53 closes this valve. As a result, the energy requirement is minimized during operation of the ventilation pump 15.
  • the second check valve 31 on the suction side of the aeration pump 15 has the smallest diameter of the sealing seat 75, so that this check valve opens only at a relatively high pressure.
  • FIGS. 14 to 16 another embodiment of a ventilation pump 15 is shown.
  • the check valves 21 and 23 are slightly different in construction than those described above. However, their function is unchanged. In the FIGS. 14 and 15 is easy to see how the membrane 43 on the sealing seat 49, which surrounds the port 25.1 in the valve plate 51, rests.
  • FIG. 15 which shows an enlarged detail of the FIG. 14 is also clearly visible that the membrane 43 rests on a further bead 87.
  • the delivery chamber 45 thus has an annular geometry and is bounded radially on the outside by the bead 87 and on the inside by the sealing seat 49.
  • a throttle 33 is formed in the valve plate 57, which connects the delivery chamber 45 with the ventilation line 25.2 or indirectly with the suction line 3 (see the block diagram in FIG FIG. 8 and the FIG. 16 ).
  • the throttle 33 ensures a pressure equalization between the suction line 3 and the delivery chamber 45, so that the forces that are required to lift the membrane 43 from the sealing seat 49 and the bead 87 are drastically reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)
  • Exhaust Gas After Treatment (AREA)
EP12733139.5A 2011-08-26 2012-07-09 Dosiersystem für ein flüssiges reduktionsmittel Active EP2748439B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011081628A DE102011081628A1 (de) 2011-08-26 2011-08-26 Dosiersystem für ein flüssiges Reduktionsmittel
PCT/EP2012/063342 WO2013029849A1 (de) 2011-08-26 2012-07-09 Dosiersystem für ein flüssiges reduktionsmittel

Publications (2)

Publication Number Publication Date
EP2748439A1 EP2748439A1 (de) 2014-07-02
EP2748439B1 true EP2748439B1 (de) 2017-10-04

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US (1) US9562455B2 (enrdf_load_stackoverflow)
EP (1) EP2748439B1 (enrdf_load_stackoverflow)
JP (1) JP6012732B2 (enrdf_load_stackoverflow)
CN (1) CN103782002B (enrdf_load_stackoverflow)
DE (1) DE102011081628A1 (enrdf_load_stackoverflow)
WO (1) WO2013029849A1 (enrdf_load_stackoverflow)

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Publication number Publication date
US20140227120A1 (en) 2014-08-14
US9562455B2 (en) 2017-02-07
JP2014524542A (ja) 2014-09-22
CN103782002A (zh) 2014-05-07
WO2013029849A1 (de) 2013-03-07
DE102011081628A1 (de) 2013-02-28
EP2748439A1 (de) 2014-07-02
JP6012732B2 (ja) 2016-10-25
CN103782002B (zh) 2017-03-22

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