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Device for mixing fluid streams

An equipment and fluid technology, applied in the field of equipment for mixing two fluid flows, can solve the problems of pressure loss, increased fuel consumption, unable to fully ensure the homogeneous mixing of exhaust gas flow and secondary air, etc., and achieve the effect of avoiding fuel consumption

Active Publication Date: 2018-04-17
WITZENMANN GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The supply of secondary air to the exhaust gas flow accordingly takes place only "point by point", wherein a homogeneous mixing of the exhaust gas flow and secondary air up to the OPF cannot be ensured sufficiently
However, the setting of the mixer is accompanied by a severe pressure loss, which in turn leads to an increase in fuel consumption

Method used

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  • Device for mixing fluid streams
  • Device for mixing fluid streams
  • Device for mixing fluid streams

Examples

Experimental program
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Embodiment Construction

[0045] figure 1 The purely schematic block diagram shows the flow-related relationships when secondary air is injected into the exhaust system of a motor vehicle with a gasoline engine. In this case, the secondary air pump (see reference number 4) is fixedly mounted on the engine or assembly. Arrows indicate the direction of flow of the fluid involved (secondary air or exhaust gas). Reference numeral 1 denotes a catalytic converter (KAT), reference numeral 2 denotes a decoupling element EKE, and reference numeral 3 denotes a gasoline particle filter (OPF). Accordingly, the exhaust gas flow A first reaches the KAT 1 , then the EKE 2 and from there to the OPF 3 . Reference numeral 4 denotes a unit or device for injecting secondary air S. As shown in FIG. Secondary air is usually introduced into the exhaust train (exhaust gas flow A) between KAT 1 and EKE 2 . Secondary air can be used to allow sufficient oxygen to be present in the exhaust to regenerate the OPF 3 so that the ...

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Abstract

A device (10) for mixing fluid streams is provided and comprises a pipeline section with a longitudinal length for a first fluid stream; and an annular flow space disposed around the pipeline sectionat least on a portion of the longitudinal length; at least one input pipeline leading to the annular flow space for introducing a second fluid stream into the annular flow space; and at least one of the following feature complexes a) and b): a) a number of openings in a wall portion separating the annular flow space from the pipeline section (11), which allows at least a part of the second fluid stream to transfer from the annular flow space to the pipeline section; b) a wall portion which separates the annular flow space from the pipeline section and which has a free end extending to the pipeline section in an area or an extension portion thereof so that the annular flow space is in fluid communication with the interior of the pipeline section in the area via an air gap.

Description

technical field [0001] The invention relates to a device for mixing two fluid streams according to claim 1 . Background technique [0002] In order to be able to meet future exhaust gas limit values ​​in actual driving cycles, additional measures for reducing particle emissions are also required in gasoline engines. It is foreseeable that gasoline particulate filters (OPF) are increasingly being used for this purpose. The OPF is installed in the underbody region of the motor vehicle and is located downstream of the catalytic converter (KAT) and the usually present decoupling element (EKE) in the direction of flow of the exhaust gas flow. In order to be able to regenerate the OPF, oxygen is required in the exhaust gas flow, but it must be supplied separately in gasoline engines, since gasoline engines, unlike diesel engines, run without oxygen remaining. [0003] According to the prior art, in order to regenerate the OPF, air is blown into the exhaust system, ie into the ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/30F01N13/08B01F3/02B01F5/04B01F23/10
CPCF01N3/30F01N13/08F01N2270/00B01F23/19B01F23/10B01F25/314F01N3/05F01N3/22F01N2240/20F01N2270/04Y02T10/12B01F25/31423B01F25/31425
Inventor 马提亚·波普大卫·埃伦伯格
Owner WITZENMANN GMBH