Exhaust aftertreatment device for dosing a liquid exhaust aftertreatment agent
An exhaust gas post-treatment and exhaust gas technology, which is applied in exhaust gas treatment, exhaust devices, noise reduction devices, etc., can solve the problems of crystal by-products, etc., and achieve the effects of improved mixing, optimized mixing, and small installation space
Active Publication Date: 2020-10-02
ROBERT BOSCH GMBH
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Problems solved by technology
The following difficulty arises when pre-treating urea solutions in exhaust gases: in addition to the desired thermal decomposition chemical reaction releasing ammonia, crystalline by-products may also be produced
Method used
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[0029] figure 1An exhaust gas aftertreatment system 1 for an internal combustion engine of a motor vehicle is shown in a simplified sectional illustration. The exhaust gas aftertreatment system 1 has an exhaust gas line 2 and an exhaust gas inlet 3 , which is connected to an internal combustion engine. Arranged in the exhaust gas line 2 is, for example, a first catalytic converter 4 and a particle filter 5 downstream of the catalytic converter 4 , which treat the exhaust gas flowing into the exhaust gas line 2 in a known manner. The exhaust gas line 2 merges into an exhaust gas supply channel 6 for an exhaust gas aftertreatment device 7 , which will be described in more detail below.
[0030] to this end, figure 2 An enlarged sectional view of the exhaust gas aftertreatment device 7 is shown. The exhaust gas aftertreatment device has a mixing tube 8 opening into the exhaust gas supply channel 6 . The end section 9 of the mixing tube facing the exhaust gas supply channel 6...
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The invention relates to an exhaust aftertreatment device (7) for metering a liquid aftertreatment agent into an exhaust stream of an internal combustion engine, comprising a mixing chamber (22), in which the exhaust aftertreatment agent is mixed with the exhaust stream, a mixing chamber (22) having a circularly cylindrical mixing pipe (8), which has a funnel-shaped end section (9) widening the periphery toward a free end, having a funnel element (17) opening at least partly conically in the direction of the mixing pipe (8), which has a plurality of passage openings (18) in the lateral wall (19) of the funnel element, and wherein an injection valve (21) for the exhaust aftertreatment agent is arranged at the end of the funnel element (17) that faces away from the mixing tube (8), in orderto inject the exhaust aftertreatment agent into the funnel element (17). According to the invention, the funnel element (17) is located at least substantially within the end section (9), coaxially with respect to the end section, and at least some of the passage openings (18) are each assigned a flow element (20) rising up from the lateral wall (19) to produce a swirling flow in the mixing pipe (8).
Description
technical field [0001] The invention relates to an exhaust gas aftertreatment device for dosing a liquid exhaust gas aftertreatment agent into the exhaust gas flow of an internal combustion engine, the exhaust gas aftertreatment device having a mixing chamber in which the exhaust gas aftertreatment agent is mixed with Exhaust gas flow mixing, wherein the mixing chamber has a cylindrical mixing tube with a funnel-shaped end section that widens its circumference towards a free end; at least partially conically open in the direction of the mixing tube A funnel element, which has a plurality of throughflow openings in its outer wall, and an injection valve, which is arranged at the end of the funnel element facing away from the mixing tube, in order to inject exhaust gas aftertreatment agent into the funnel element. [0002] The invention also relates to an exhaust gas aftertreatment system having the aforementioned exhaust gas aftertreatment device. Background technique [000...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F01N3/28F01N13/00B01F5/00
CPCF01N3/2892F01N13/009F01N2240/20F01N2260/06F01N2610/02F01N2610/03B01F23/2132B01F2025/931B01F25/10B01F25/3131
Inventor K·哈尼
Owner ROBERT BOSCH GMBH