• 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:
    SAM I / IAN D RAG Mixer (10) for a main stream (M) and an auxiliary stream (A) injected therein in a fluid line (52, 52 ') of an internal combustion engine (50), comprising a set of flow control elements (12) distributed over a cross section of the mixer. According to the invention, adjacent elements (12) in the set are continuously designed to generate vortices (v) with different axes of rotation (54) and with mutually opposite directions of rotation in a resulting flow in the fluid line (52). (Flo. 1)
    公开号:SE1050194A1
    申请号:SE1050194
    申请日:2010-03-02
    公开日:2011-09-03
    发明作者:Daniel Norling；Reijo Oilenius；Daniel Engman
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    10152025302According to a consideration of the invention, the mixer is characterized by adjoining each other.elements in the set are consistently designed to generate vorticesdifferent axes of rotation and with mutually opposite directions of rotation in a resulting flowthose in the fluid line. In this way, the adjacent vortices rotate in the opposite direction.In the set direction, there is no shear zone that brakes the vortices, so that they can continueand mixing the fluids over a longer distance in the line.
    The mixer can be designed in a number of advantageous embodiments.
    According to one embodiment, the elements can be connected to a common frame.
    The body can then either be arranged to be directly connected to an inside of the fluid.the line or to be connected to the fluid line via a holder.
    A simple and cost-effective construction can be achieved if the elements are designed.shaped in one piece with the frame.
    The mixer can further be resiliently biased towards the inside of the fluid line. Mix-clean can then be easily mounted without fasteners in the fluid line.
    The mixer may further have a holder for connecting the mixer to an injector forthe additive flow. Thereby, the mixer and the injector can form a prepared unit whichcan simplify the installation in the fluid line.
    The elements can typically be annular concentrically distributed in the cross section, optionallynear the center of the cross section.
    The elements may further comprise elongate blade elements, rotated about a longitudinalshoulder. They can then be formed, for example, by circumferential direction adjacent tabs ofthe above-mentioned common body, which flaps are made from one at one endslotted pipe piece and twisted in mutually opposite directions.
    The elements may also include different types of vortex generators, so-called vortex generators.10152025303Other features and advantages of the invention will be apparent from the claims and the followingdescription of embodiments.
    BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a schematic plan view, partly in section, showing a general mixer according to FIGthe invention in an exhaust line of an internal combustion engine;FIG. 2 is a rear view of a mixer according to an embodiment of the invention;FIG. 3 is a rear oblique view of a mixer according to FIG. 1;FIG. 4 is a perspective view obliquely from the front and partly in section of a mixer according to FIG. 2and 3 mounted in an exhaust line together with an injector for an auxiliaryfluid;FIG. 5 is a front perspective view of another embodiment of a mixer according tothe invention, mounted in a section of an exhaust line;FIG. 6 is a perspective view obliquely from behind and partly in section of a further embodiment.in the form of a mixer according to the invention, mounted in an exhaust line;FIG. 7 is an oblique view from the side with cut away parts of a flow control elementin a mixer of a further embodiment according to the invention; andFIG. 8 is a perspective view obliquely from behind of a mixer of yet another embodimentaccording to the invention.
    In the drawing, equal reference numerals are used whenever possible for parts with equal or similarfunction.
    DETAILED DESCRIPTION OF PERFORMANCE EXAMPLEIn FIG. 1 generally shows a mixer 10 incorporated in a fluid conduit 52 of a combustion chamber.motor 50 for mixing a main flow l / I with an auxiliary flow A.the mixer 10 in FIG. 1 in an SCR system where it is arranged in an exhaust pipe52 of a diesel engine in a motor vehicle 80, to mix a main flow M of exhaustsee with an injected addition stream A of urea. The resulting mixed flow shouldpost-treated in a catalytic converter 58 for nitrogen oxides, which may bein a muffler 56. However, as mentioned above, a mixer can also be used10152025304used for mixing other, not shown combinations of gaseous and liquidflows of an internal combustion engine.
    The additive stream A is injected into the main stream through a spray nozzle 72 of a spreaderor injector 70, which in a manner not shown in more detail is fixedly mounted inside the exhaust pipe52. The injector 70 is connected to a conduit 64 which picks up an auxiliary fluid in the form ofliquid urea from a container 60. In line 64 there is a pump 62 for pressurizingthe additive fluid. The nozzle 72 may typically have a spray character with a relatively shortrange and relatively small droplets, and may be located relatively close to the mixer 10.
    As can be seen in more detail from FIG. 2-8, a mixer 10 has a set of a pluralityflow control elements 12, which are distributed over a cross section of the mixer 10 orthe exhaust pipe 52. As indicated in FIG. 1 and 7, the flow control elements 12 are eachand one designed to produce rotating axes 54 about mixing different axes of rotation 54the additive flow with the main flow. adjacent flow control elements 12 in the cross section arein addition, consistently designed to give the vortices v a mutually opposite rotationdirection of rotation about the different axes 54.
    The mixer 10 and the flow control elements 12 can be formed on manydifferent ways within the scope of the invention.
    In the embodiment of FIG. 2-4, the mixer 10 comprises a piece of metal pipe, whichfrom a downstream end is provided with an even number, e.g. eight, longitudinal slits.
    The flaps defined between the slots have then been rotated about their longitudinal axessuccessive opposite directions. The flaps twisted in this way formthereby a coaxial set of vortex forming elements 12 according to the invention.
    The remaining upstream part of the mixer 10 forms a body 16 which canserve to anchor the mixer 10 in the exhaust pipe. In the embodiment shown in FIG. 4 inne-the mixer 10 comprises a number of spokes or radial support flanges 18 extending betweenthe body 16 and an outer cylindrical holder 20. The holder 20 in FIG. 4, as well as eachof the holders 20 in FIG. 5-7, may be fixedly connected to the inside of the exhaust pipe 52suitable fasteners, not shown. It can also be soldered or welded to the exhaust pipe52, or even be expanded by heat or spring force for fixing to the exhaust10152025305inside 52 of the tube. In the latter case, the holder 20 may also be included in one not showncircumferential grooves at the inside. As indicated in FIG. 1, it is also possible to sound mixer 10and injector 70 be pre-installed in a separate pipe section 52 'of the exhaust line 52.
    In the embodiments shown in FIG. 5-7, the flow control elements 12 are formedas vortex generator type. Such a vortex generator can beis written as an aerodynamic surface comprising a small blade which generates a vortex flow,i.e. a rotating, often turbulent fluid flow. The vortex flow is generated by the blade formingan angle of attack against the inflowing flow.
    In the embodiment of FIG. 5, the vortex generators comprise a set of oneeven number of radially aligned elements 12, in which the circumferential direction of adjacent elements12 with their main planes are slightly angled in opposite directions away from the exhaustshaft 52 axis. The vortices generated at the free ends of the adjacent elementselement 12, will then have different directions of rotation.
    In the embodiment of FIG. 6, the mixer 10 is formed in one piece by a strip ofelastic material, such as spring steel. Even in this case, they can both in the circumferential directionadjacent vortex generators 12 are considered to be angled in opposite directions from thethe axis of the gas pipe 52, so that they will generate opposing vortices in a resultantflow through the exhaust pipe 52. The body or holder 20 of the mixer 10 can be fixedheld against the inside of the exhaust pipe 52 by inherent radially directed spring force.
    In the embodiment of FIG. 7 is each vortex generator 12 (only one is shown with the wholedrawn lines) designed as a double vortex generator of triangular delta type, so thatit generates a vortex v at each trailing corner. If the frame or holder 20 resp.16is arranged concentrically and at a distance to the inside of the exhaust pipe (not shown)the vortex generators 12 may also be doubled in the radial direction, as indicated bydotted lines are drawn in FIG. 7. Such a duplicate arrangement of the vortex geneof course 12 is also possible for the one above in connection with FIG. 5 describedthe mixer 10.1015206The vortex generators 12 described above may also have a curved profile (not shown), as well as oneguide vane, and also the vortex generators in FIG. 5 and 6 may haveor triangular shape.
    In FIG. 8 shows the possibility of leaving the mixer 10 fixedly connected to the injector 70via a holder 20. The holder 20 can for instance be designed as a cage, which onis suitably attached to the injector 70, e.g. through spokes not shown.
    The above detailed description is primarily intended to facilitate understanding andno unnecessary limitations of the invention should be construed therefrom. The modifierswhich will become apparent to one skilled in the art upon review of the specification maycarried out without deviation from the inventive concept or the scope of the followingpatent claims. As some examples of modifications it can be mentioned that the mixer can onanalogously used to mix exhaust gas in an EC R system for an internal combustion enginesee with fresh air supplied to the engine. Furthermore, the engine can consist of other types ofinternal combustion engines such as an otto engine. Instead of mixing urea into the exhaust gases canit may be a matter of mixing other types of medium in an SCR system such asammonia or solutions containing ammonia. Some exhaust gas cleaning systems include onefilter that traps particles in the exhaust stream, which filter can be cleaned byspraying a hydrocarbon (fuel) into the exhaust stream to, like a combustionraise the exhaust gas temperature. Also for this purpose, a mixer described above canexploited.
    权利要求:
    Claims (10)
    [1]
    A mixer (10) for a main flow (M) and an auxiliary flow (A) injected therein in a fluid line (52, 52 ") a combustion engine (50), comprising a set of flow control elements (12) distributed over a cross-section of the mixer, characterized in that adjacent elements (12) in the set are consistently designed to generate vortices (v) with different axes of rotation (54) and with mutually opposite directions of rotation in a resulting flow in the fluid line. (52).
    [2]
    Mixer according to claim 1, characterized in that the elements (12) are connected to a common body (16, 20).
    [3]
    Mixer according to claim 2, characterized in that the body (20) is arranged to be connected to an inside of the fluid line (52).
    [4]
    Mixer according to claim 2, characterized by a holder (20) for connecting the mixer (10) to the fluid line (52).
    [5]
    Mixer according to one of Claims 2 to 4, characterized in that the elements (12) are formed in one piece with the body (16, 20).
    [6]
    Mixer according to one of the preceding claims, characterized in that it is resiliently biased towards the inside of the fluid line (52).
    [7]
    Mixer according to one of the preceding claims, characterized by a holder (20) for connecting the mixer (10) to an injector (70) for the additive flow.
    [8]
    Mixer according to one of the preceding claims, characterized in that the elements (12) are annularly concentrically distributed in the cross section.
    [9]
    Mixer according to one of the preceding claims, characterized in that the elements (12) comprise elongate blade elements, rotated about a longitudinal axis. 8
    [10]
    Mixer according to one of the preceding claims, characterized in that the elements (12) comprise elements of the vortex generator type.
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    同族专利:
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    SE534822C2|2012-01-10|
    引用文献:
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    CN104321507A|2012-04-19|2015-01-28|唐纳森公司|Integrated exhaust treatment device having compact configuration|
    WO2018127533A1|2017-01-06|2018-07-12|Sabic Global Technologies B.V.|Device for injecting and mixing a reactive fluid in high pressure ldpe processes|
    US11130110B2|2017-01-06|2021-09-28|Sabic Global Technologies B.V.|Device for injecting and mixing a reactive fluid in high pressure LDPE processes|
    法律状态:
    2016-11-01| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1050194A|SE534822C2|2010-03-02|2010-03-02|Mixer for a main flow and an auxiliary flow injected therein|SE1050194A| SE534822C2|2010-03-02|2010-03-02|Mixer for a main flow and an auxiliary flow injected therein|
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