• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    It is proposed a pump (2) for pumping an additive in a vehicle SCR system, the pump being configured to rotate in a first direction of rotation to convey the additive stored in a reservoir to an injector via a channel. injection, and in a second direction of rotation to purge the injection channel, the pump comprising a chamber (23) in which is housed a gear system (22), the chamber (23) being in fluid communication with the reservoir and the injection channel via respectively an inlet channel (24) and an outlet channel (25). The pump is such that the inlet channel and the outlet channel are arranged so that, after purging the injection channel, the chamber collects and retains additive.
    公开号:FR3013762A1
    申请号:FR1361717
    申请日:2013-11-27
    公开日:2015-05-29
    发明作者:Stephane Leonard
    申请人:Inergy Automotive Systems Research SA；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a pump for a solution of an ammonia precursor. The legislation on emissions from vehicles and heavy vehicles includes a reduction of NOx emissions in the atmosphere.
    [0002] To achieve this objective is known the SCR (Selective Catalytic Reduction) process which allows the reduction of nitrogen oxides by injection of a reducing agent, generally ammonia, into the exhaust line. This ammonia can come from the decomposition by thermolysis of a solution of an ammonia precursor whose concentration can be that of the eutectic. Such an ammonia precursor is generally a urea solution. With the SCR process, the high NO emissions produced in the engine during an efficiency-optimized combustion are treated at the engine outlet in a catalyst. This treatment requires the use of the reducing agent at a precise concentration level and in an extreme quality. The solution is thus precisely metered and injected into the exhaust stream where it is hydrolysed before converting nitrogen oxide (NO 3) to nitrogen (N 2) and water (H 2 O). To do this, it is necessary to equip the vehicles with a tank containing an additive solution (usually urea), and a device (or injector) to dose and inject the desired amount of additive into the line exhaust. Generally, a feed device is used to convey the additive from the reservoir to the injector via an injection channel (or injection line). Generally, the feed device comprises a rotary pump driven by a motor. In order to facilitate operation, restarting the system in case of frost and to avoid the bursting of the often flexible pipes which convey the additive (urea generally), it is advantageous to purge the pipes at the end of the operation of the system . In particular, it is advantageous to purge the injection channel. Generally, the purge of the line (s) is effected by suction of air and / or exhaust gas through the injector with the help of the rotary pump which for this purpose turns in a reverse direction in the sense for the supply of the injector. Figure 1 schematically illustrates an example of a rotary pump known for an SCR system.
    [0003] The rotary pump 1 of FIG. 1 is configured to rotate in a first direction of rotation to convey the additive stored in a reservoir to an injector via an injection channel, and in a second direction of rotation (reverse in the first direction rotation) to purge the injection channel. The rotary pump 1 comprises: a rotor 11 cooperating with a stator (not shown); and a chamber 13 in which is housed a gear system 12. The chamber 13 is placed in fluid communication with the reservoir and the injection channel via an inlet channel 14 and an inlet channel respectively. outlet channel 15. The inlet channel 14 is connected to the upper wall 131 of the chamber and the outlet channel 15 to the bottom wall 132 of the chamber. Generally, after purging has been performed, the chamber 13 is essentially filled with air. Therefore, the next system start can be difficult and time consuming. Thus, to facilitate this start it is generally proposed to open the injector at the start of startup. However, this complicates the steering strategy of the injector. Furthermore, an amount of uncontrolled additive can be injected into the exhaust line while it has not yet reached a temperature sufficient to ensure the desired chemical reaction. The present invention aims to solve these problems.
    [0004] Therefore, the present invention relates to a pump for pumping an additive in a vehicle SCR system, the pump being configured to rotate in a first direction of rotation to convey the additive stored in a reservoir to an injector via a channel. injection, and in a second direction of rotation to purge the injection channel, the pump comprising a chamber in which is housed a gear system, the chamber being placed in fluid communication with the reservoir and the injection channel by the intermediate respectively of an input channel and an output channel. The pump is such that the inlet channel and the outlet channel are arranged so that, after purging the injection channel, the chamber collects and retains additive.
    [0005] Thus, it is proposed to use the gear system chamber as an additive trap. More specifically, the chamber according to the invention is configured to collect and retain additive after purging the injection channel (that is to say at the system shutdown).
    [0006] Advantageously, the chamber is configured to collect and store additive residues from the inlet channel. Generally after purging, the inlet channel contains additive residues (i.e., additive droplets). These residues generally fall into the gearbox chamber under the effect of gravity and are then removed from the chamber via the gravity outlet channel. The invention therefore proposes an opposite approach according to which these additive residues are retained in the chamber. To do this, the inlet channel and the outlet channel are arranged with respect to the chamber so that there is no path through which the additive residues can be totally drained out of the chamber by gravity. . Thus, when the pump is stopped after a purge, the chamber can store the additive. The chamber according to the invention may be partially filled with additive. Preferably, the chamber according to the invention is completely filled with additive. In this way, the gear system can be totally immersed in the additive. In other words, before the next start of the system, the gear system is embedded in the additive. Such a configuration has the advantage of ensuring easy restart of the system, to facilitate the suction (pumping) of the additive tank and keep the injector closed at the start of startup. According to a particularly advantageous embodiment, the outlet channel comprises a siphon-shaped section connected to the chamber. In an advantageous embodiment, the inlet channel comprises a buffer volume configured to retain additive during purge of the injection channel. Thus, this buffer volume constitutes an additive reserve which is intended to fill the chamber of the gear system at the end of purging (that is to say at the pump stop). In this way, it is ensured that the chamber is always at least partially filled with additive before the next start of the system. Advantageously, the buffer volume is dimensioned so that, during purging, it accumulates an amount of additive sufficient to completely fill the chamber.
    [0007] Preferably, the gear system comprises at least two gears (gears) which allow, by rotation, to pump the additive from the reservoir to the injection channel and to suck up the additive into the feed channel. Injection to the reservoir The gears of such a pump are preferably based on a polymer and more particularly on a polymer loaded with fibers such as PEEK loaded with carbon fibers.
    [0008] The present invention also relates to a tank for SCR system comprising an additive pump as described above. The additive referred to in the context of the invention is preferably a reducing agent capable of reducing the NOx present in the exhaust gases of internal combustion engines. It is advantageously ammonia used directly (which has the associated safety and corrosion disadvantages) or generated in situ, in the exhaust gas from a precursor such as urea (which allows avoid the aforementioned drawbacks). The invention gives good results with urea and in particular with aqueous solutions of urea. Eutectic solutions (comprising 32.5% by weight of urea) are suitable. The present invention can be applied to any internal combustion engine capable of generating NOx in its exhaust gas. The system according to the invention comprises at least one reservoir for storing the additive and at least one injection channel (or line) for bringing the additive to an exhaust pipe of the engine. This channel is provided at its end with an injector for injecting the additive into the exhaust gas. The system according to the invention also comprises a pump for bringing the additive from the additive reservoir to the injector. This pump can be located in the additive tank (with the advantage of forming with it, a compact and integrated module) or, given the corrosive environment, be located outside the additive tank. Its constituent materials will preferably be selected from corrosion-resistant metals (certain grades of stainless steel and polymers in particular).
    [0009] Most often, the system according to the invention comprises a computer connected to the injector and for injecting into the exhaust gas, the quantity of additive required (in particular according to the following parameters: emission and NOx conversion, temperature and pressure, speed and engine load ...).
    [0010] Other features and advantages of the invention will appear on reading the following description, given by way of indicative and nonlimiting example, and the accompanying drawings, in which: FIG. 1, commented previously, schematically illustrates a pump with additive known from the state of the art; FIG. 2 diagrammatically illustrates an additive pump according to a first particular embodiment of the invention; and Figure 3 schematically illustrates an additive pump according to a second particular embodiment of the invention.
    [0011] A first embodiment of an additive pump according to the invention will now be described with reference to FIG. The pump 2 is configured to rotate in a first direction of rotation to convey the additive stored in a reservoir to an injector via an injection channel, and in a second direction of rotation (inverse to the first direction of rotation) to purge the injection channel. The pump 2 comprises: a rotor 21 cooperating with a stator (not shown); and a chamber 23 in which is housed a gear system 22. The chamber 23 is in fluid communication with the reservoir and the injection channel via an inlet channel 24 and a channel respectively. In this first particular embodiment, the inlet channel 24 and the outlet channel 25 are connected to (mounted on) the upper wall 231 of the chamber. The outlet channel 25 comprises a siphon-shaped section 251. Such an architecture makes it possible, after the purge has been carried out (ie pump stopped), to trap in the chamber 23 the additive residues falling by gravity from the input channel 24. In fact, the position of the channel of outlet 25 is such that it does not allow the additive residues to escape completely by gravity of the chamber. These additive residues will be removed from the chamber by the gear system 22 at the next start of the system (i.e. pump in operation). It is noted that under gel conditions, the additive stored in the chamber 23 can freeze. Before restarting the pump (and thus rotating the gear system), it is advantageous to liquefy (ie thaw) the additive stored in the chamber 23. This can be done, for example, by means of a heater placed in the tank. Furthermore, it is possible to apply a strategy of preheating the pump by controlling, for example, the coils of the pump for use as heating elements. A second embodiment of an additive pump according to the invention will now be described with reference to FIG.
    [0012] The pump 3 comprises: a rotor 31 cooperating with a stator (not shown); and a chamber 33 in which is housed a gear system 32. The chamber 33 is in fluid communication with the reservoir and the injection channel via an inlet channel 34 and a channel respectively. In this second particular embodiment, the inlet channel 34 is connected to (mounted on) the upper wall 331 of the chamber. The inlet channel 34 comprises a buffer volume 341 configured to retain additive during purge of the injection channel. Advantageously, the buffer volume 341 acts as a sort of liquid-vapor separator. More specifically, the hydraulic section of the buffer volume is large enough so that the passage of air (sucked by the injector) into this volume is a flow by air bubbles, unlike a flow plugs that occurs in a volume of hydraulic section less than or equal to the section of the air bubbles.
    [0013] The outlet channel 35 is connected to (mounted on) the side wall 332 of the chamber in a close area (i.e., a few millimeters) of the upper wall 331 of the chamber.
    权利要求:
    Claims (6)
    [0001]
    REVENDICATIONS1. Pump (2) for pumping an additive into an SCR system for a vehicle, the pump being configured to rotate in a first direction of rotation to convey the additive stored in a reservoir to an injector via an injection channel, and following a second direction of rotation for purging the injection channel, the pump comprising a chamber (23) in which is housed a gear system (22), the chamber (23) being in fluid communication with the reservoir and the channel of injection via an inlet channel (24) and an outlet channel (25) respectively, characterized in that the inlet channel and the outlet channel are arranged so that, after a purge of the injection channel, the chamber collects and retains additive.
    [0002]
    2. Pump according to claim 1, characterized in that the outlet channel comprises a siphon-shaped section (251) connected to the chamber.
    [0003]
    3. Pump according to claim 1 or 2, characterized in that the inlet channel comprises a buffer volume (341) configured to retain the additive during the purge of the injection channel.
    [0004]
    4. Pump according to any one of claims 1 to 3, characterized in that the gear system (22) comprises at least two gears based on polymer.
    [0005]
    5. Pump according to any one of claims 1 to 4, characterized in that the additive is an aqueous solution of urea.
    [0006]
    6. Tank for SCR system comprising a pump according to any one of claims 1 to 5.30
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    同族专利:
    公开号 | 公开日
    US10280920B2|2019-05-07|
    US20170335845A1|2017-11-23|
    EP3080454A1|2016-10-19|
    CN105765222A|2016-07-13|
    CN105765222B|2018-05-01|
    FR3013762B1|2017-07-21|
    EP3080454B1|2018-08-22|
    WO2015078777A1|2015-06-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20100175369A1|2007-07-10|2010-07-15|Inergy Automotive Systems Research |System for supplying a liquid for a vehicle and integrated pump/filter module|
    WO2010119116A2|2009-04-16|2010-10-21|Inergy Automotive Systems Research |System and process for storing an additive and injecting it into the exhaust gases of an engine|
    DE102009045030A1|2009-09-25|2011-03-31|Robert Bosch Gmbh|Gear pump for injection system, particularly for motor vehicle, has electric motor for supplying fluid, gear wheel with cogs and working room|
    EP2538082A2|2011-06-22|2012-12-26|Robert Bosch Gmbh|Gear pump with variable delivery volume|
    US3824047A|1973-03-23|1974-07-16|Dermott H Mc|Floating rotary ring member of fluid displacement device|
    JP2699390B2|1988-03-28|1998-01-19|アイシン精機株式会社|Internal gear motor|
    DE10348985B3|2003-10-22|2005-05-19|Berstorff Gmbh|gear pump|
    DE602007009676D1|2006-06-08|2010-11-18|SYSTEM FOR STORING MOTOR GAS ADDITIVES|
    US20090194604A1|2008-01-19|2009-08-06|Clyde Meriwether Smith|Pulsed spray system of reduced power consumption|
    JP2012021516A|2010-07-16|2012-02-02|Seiko Epson Corp|Fluid flowing device, fluid discharge device, and fluid flowing method|
    US8840385B2|2011-03-03|2014-09-23|Ti Group Automotive Systems, L.L.C.|Positive displacement fluid pump|
    KR101326838B1|2011-11-02|2013-11-11|현대자동차주식회사|Ureawater pump structure|DE102016205555A1|2016-04-04|2017-10-05|Röchling Automotive SE & Co. KG|SCR device with valve arrangement|
    WO2017211233A1|2016-06-06|2017-12-14|天纳克（苏州）排放系统有限公司|Integrated apparatus, exhaust gas post-processing system, and control method|
    DE102017200045A1|2017-01-04|2018-07-05|Robert Bosch Gmbh|Water injection apparatus|
    CN108691623B|2017-04-12|2021-03-16|天纳克（苏州）排放系统有限公司|Method for sectionally building pressure of tail gas aftertreatment system|
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    法律状态:
    2015-11-26| PLFP| Fee payment|Year of fee payment: 3 |
    2016-11-28| PLFP| Fee payment|Year of fee payment: 4 |
    2017-11-23| PLFP| Fee payment|Year of fee payment: 5 |
    2019-11-29| PLFP| Fee payment|Year of fee payment: 7 |
    2020-11-27| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1361717A|FR3013762B1|2013-11-27|2013-11-27|PUMP FOR ADDITIVE|FR1361717A| FR3013762B1|2013-11-27|2013-11-27|PUMP FOR ADDITIVE|
    PCT/EP2014/075259| WO2015078777A1|2013-11-27|2014-11-21|Pump for an additive|
    US15/039,659| US10280920B2|2013-11-27|2014-11-21|Pump for an additive|
    CN201480064702.4A| CN105765222B|2013-11-27|2014-11-21|Pump for additive|
    EP14800093.8A| EP3080454B1|2013-11-27|2014-11-21|Pump for an additive|
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