• 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:
    MIXING DEVICE FOR POSTERIOR TREATMENT OF DISCHARGE GASES. The present invention relates to a mixing device (1) for further treatment of exhaust gases (2) in an exhaust gas equipment of an internal combustion engine, which comprises a housing (4) having a cross section of inlet and an inner tube (7) disposed inside the housing (4), extending essentially parallel to a main injection direction (5) of a dosing plant (6) for adding a liquid and / or a mixture of liquid / gas, with a premix region (10) executed inside (8) of the inner tube (7), and the housing (4) has a housing segment (13) in a spiral shape and on a front side (11) of the housing (4) the metering installation (6) is arranged, with a main flow of exhaust gas (12) being conducted between the housing (4) and the outer side area (14) of the inner tube ( 7) and adducible to a main mixing region (16), and a partial flow of exhaust gas (17) is adducible for a passage of internal tube (18) to a pre-mixing region (10) closest to the dosing installation, with the partial flow of exhaust gas (17) flowing through the pre-mixing region (10) in the region of ( ...).
    公开号:BR102013017993B1
    申请号:R102013017993-0
    申请日:2013-07-15
    公开日:2021-04-06
    发明作者:Herbert Albert
    申请人:Man Truck & Bus Ag；
    IPC主号:
    专利说明:

    [0001] [0001] The present invention relates to a mixing device for further treatment of exhaust gases in an exhaust gas equipment of an internal combustion engine, which comprises a housing having an inlet cross section and an internal tube arranged inside the housing, extending essentially parallel to a main injection direction of a dosing installation for the addition of a liquid and / or a liquid / gas mixture, with a mixing region performed inside the inner tube.
    [0002] [0002] The publication DE 10 2009 053 950 A1 presents a mixing device, in which a discharge gas is mixed with a liquid reduction medium applied by a metering installation, with the discharge gas passing through openings distant from the installation. of dosing an inner tube radially into its inner compartment and, through an opening close to the dosing installation, located on the front side, into the inner compartment of the inner tube. An essential partial flow of the exhaust gas flows directly into the injection region of the dosing plant and influences the conduction of the reduction medium.
    [0003] [0003] The purpose of the invention is to improve a mixing device with the characteristics of claim 1 in such a way that the mixing of the liquid with the discharge gas occurs reliably and as homogeneously as possible regardless of the influence of the volumetric flow of gas from discharge or only under the small influence of In addition, it is an objective of the invention to perform the mixing by crossing a short stretch of mixing and keeping the volume of the mixing device small.
    [0004] [0004] This objective is achieved by the characteristics of claim 1. Other advantageous configurations of the invention are found in subclaims 2 to 15.
    [0005] [0005] At the heart of the invention is the fact that the housing has a spiral-shaped housing segment and the dosing installation is arranged on a front side of the housing, with a main flow of exhaust gas being conducted between the housing and the outer side area of the inner tube and adducible to a main mixing region, and a partial flow of gas is adducible by passing an inner tube to a premix region closest to the dosing installation, the partial flow of discharge gas flows through the premix region in the main mixing region and the main flow of discharge gas comprises a fraction of volume greater than the partial flow of discharge gas. Due to the fact that the exhaust gas flow is subdivided into a smaller volume partial gas flow and a larger volume main gas flow and both exhaust gas flows are brought together within a region of main mixture, both a liquid feed which is under little influence of the volume flow of the exhaust gas, but also simultaneously a reliably homogeneous mixture of the liquid within the total gas flow is obtained due to the reunion of the main gas flow of discharge and partial flow of discharge gas still occurring in the main mixing region. The function of the spiral-shaped housing must be seen in the fact that at least the main flow of exhaust gas is applied with a twisting motion. This torsional movement acts advantageously on the mixture of liquid and discharge gas and their homogenization in the premix and main mixture region. The passage of the inner tube allows a pressure compensation between the main flow of exhaust gas and the interior of the inner tube close to the nozzle as well as obtains a smaller mass flow of partial exhaust gas to assist the jet out of the interior of the tube internal. Without the prediction of the bypass channel and the addition of the partial flow of exhaust gas to the premix region, the temporarily introduced liquid can behave in the manner of an elastic mass system and lead to pressure fluctuations at least temporary in the regions mixing and, therefore, the most unfavorable conditions for a homogeneous mixture; this is avoided with the execution according to the invention.
    [0006] [0006] When the introduction of a liquid through the dosing plant is described, then this can also comprise a liquid-gas mixture, for example, in the form of a spray; the following will be treated in a simplified way and as an example of a liquid. Basically, the dosing plant introduces a reduction medium such as, for example, a urea solution or also a material containing hydrocarbon in the mixing device and mixing it as homogeneously as possible with the exhaust gas. In the case of the urea solution, it is added, for example, to a hydrolysis catalyst disposed downstream and converted there.
    [0007] [0007] In an advantageous embodiment, the main injection direction of the dosing installation is arranged essentially parallel and / or coaxial to the longitudinal axis of the housing and / or to the longitudinal axis of the inner tube. With this, a compact and effective structure of the mixing device can be obtained, since the partial flows of exhaust gas line up and are guided in the walls of the housing and the inner tube. In this way, a partial flow of discharge gas flow and a main flow of discharge gas flow in the same direction and liquid introduction are achieved in a constructive way.
    [0008] [0008] It has been proven advantageous that the discharge gas flow is divided into two or at most three partial flows. Especially when a main flow of exhaust gas introduced last into the mixing region comprises at least 70% by vol. of the exhaust gas flow, preferably at least 80% by vol. of the discharge gas flow, especially preferably at least 90% by vol. of the discharge gas flow, the above described effect of reliable homogenization and the small influence of the introduction of liquid by the discharge gas addiction is achieved. Due to the fact that only a small part (at least less than 30% by volume), such as one or possibly several partial flows, is mixed with the liquid supplied by the longitudinal axis of the inner tube before the main discharge gas flow, an introduction of liquid into the homogeneous exhaust gas is obtained and only slightly dependent on the volume flow of the exhaust gas. Especially for liquid droplets injected with small mass, the partial discharge gas flow with its small volumetric flow is advantageous, as these drops are not then diverted excessively from the discharge gas volume flow. These drops show a small impulse and with the activation of a greater volumetric flow (cf. main flow of exhaust gas) they are deflected with such intensity that they could be deposited excessively on the inner wall of the inner tube. This is avoided with the device according to the invention - especially by the partial flow of lower volume exhaust gas, acting early on the liquid - or at least kept in a small frame, not essentially affecting the mixing process. The discharge gas flow is the discharge gas added to the inlet cross-section region.
    [0009] [0009] In addition, it has proved advantageous to provide the inner tube with a cylindrical segment and a tapering segment, the tapering segment being assembled before the cylindrical segment in the current direction of the main discharge gas flow. The tapering segment acts as a bypass region and deflects the main exhaust gas flow added "with little pressure loss" - that is, with minimal resistance - parallel to the main injection direction of the dosing plant. The tapering segment preferably then comprises a radius varying permanently and / or continuously, which is configured, for example, as a radius increased on the outside of the inner tube permanently and / or continuously in the direction of flow of the main flow of discharge gas. Continuous variation or increase in radius means an uninterrupted change and / or always progressing in one direction (increasing). This measure leads to a deviation of the exhaust gas under a small resistance, acting on the flow of exhaust gas. Alternatively, the offset region can also comprise a constant and continuous radius. This execution is more cost-effective and simpler to produce.
    [0010] [00010] Due to the tube width of the inner tube, which should be considered as the region between the maximum outer diameter of the tube and the minimum inner diameter of the tube, there is an adduction of the partial flow of exhaust gas to the pre-mix region essentially ( ie +/- 10%) at right angles to the main injection direction. As only a small fraction of the exhaust gas crosses this contour to the mixing region, its movement occurs at least partially at right angles to the main injection direction, it is not or is just not essentially disadvantageous for the introduction of the liquid in the region. mixing.
    [0011] [00011] Alternatively and / or in addition to the addition of the partial discharge gas flow to the pre-mixing region, described above, proceeding at least partially at right angles to the main injection direction, it is advantageous that inside the inner tube and / or inside the or in the premix region, conductive elements are arranged, which deviate the partial flow of exhaust gas in the main injection direction. With this, for example, a "protective collar" can be arranged around the region close to the metering device, so that the introduction of liquid is not initially disturbed by an activation with the partial flow of exhaust gas. Also by the conducting elements, an advantageous deviation of the partial flow of exhaust gas in the direction of the main injection can occur. With this, three regions are formed for mixing the liquid, a first region within the conductive element, in which exclusively a liquid introduction occurs without activation with discharge gas. A second region - the premix region - where the partial flow of exhaust gas is "premixed" with the liquid exiting the first region. In the third region - main mixing region - the main discharge gas flow is added to the pre-mixed partial discharge gas-liquid mixture. The conducting element is then executed preferably in the manner of a ring and configured on its circular cylindrical inner side and tapering in its cross section to its free end.
    [0012] [00012] In an especially preferred embodiment, the conductive element and / or another deflection element can induce a partial component of the exhaust gas to flow, extending at right angles to the main injection direction and / or a stroke spiral movement. With this, the partial flow of discharge gas is given a rotational movement. For example, a rotation that may have already been produced by the spiral shape of the housing in the premix region can be assumed and / or reinforced.
    [0013] [00013] In an advantageous constructive configuration, the length of the conducting element (in the direction of the longitudinal axis of the inner tube) is shorter than the length of the inner tube. In particular, the length of the conducting element may be shorter than half or shorter than a quarter of the inner tube. This configuration allows for a compact and effective mixing device. The conductive element serves, fundamentally, to protect the region close to the metering installation of the partial discharge gas stream and to divert in the direction of the main injection the partial flow of discharge gas radially added to the conductive element or to the main injection shaft. Thus, especially the droplets of the low mass liquid in the inlet region are not deflected by the partial flow of exhaust gas.
    [0014] [00014] Alternatively or additionally, the main discharge gas flow itself can act positively in relation to the current conditions in the premix region, insofar as by a suction effect produced by the main discharge gas flow (production underpressure) in the premix region, another influence of the direction of the liquid and / or the flow of the main exhaust gas is viable in or parallel to the direction of the main injection.
    [0015] [00015] Preferably, the injection angle α is so selected that the injection (the liquid) essentially does not touch the inner wall of the inner tube, in the state not crossed by the discharge gas flow. As a result, only a small fraction of the liquid's mass should touch the inner wall of the inner tube and eventually settle there. When this is achieved in the state not traversed by the discharge gas flow, then in the state traversed by the discharge gas flow (operational state), a humidification is obtained - slight (less than 15%, preferably less than 8%) and present at least in defined load scenarios of the engine - from the inner side of the inner tube. This contact or humidification then occurs on the inner side of the inner tube in the extreme region opposite the dosing installation, preferably on the last eighth of the inner tube and, therefore, close to the transition to the main mixing region. A slight and / or temporary wetting of the inner wall of the end of the inner tube is especially tolerable in the state traversed by the discharge gas flow and is also advantageous. Due to the fact that a small part of the liquid is deposited at least temporarily on the inner wall of the inner tube, in this way a certain storage of liquid is obtained. This dosing facility usually operates temporarily. Thus, during the non-injection intervals, a "drop" of the liquid found in the inner wall of the inner tube can be obtained. This effect is favored by the fact that the inner tube is thin-walled and / or is heated on the outer side by the main flow of exhaust gas, so that the liquid found in the wall segments of the inner wall also heats up. This heat facilitates the separation effect and the decomposition effect (secondary rupture) of the liquid droplets that are found on the inner side of the inner tube. In other words, due to the slight temporary wall contact of the liquid obtained, the mixing function of the mixing device is further favored, especially since this "liquid storage" is arranged at the end of the inner tube and thus close to the mixing region. main, and the effects of aspiration or underpressure of the passage formed, preferably as an annular gap for the main mixing region, can also be proven to promote the mixing properties of the mixing device.
    [0016] [00016] By projecting the length of the inner tube, in a constructive simple and effective way, the degree of temporary adherence of the liquid can be adjusted. As a rule, the dosing installation and, thus, the injection angle, as well as the density of the liquid, are predetermined. These parameters influence the diffusion properties of the injection as a function of the volumetric flow of exhaust gas. Should a liquid with a different density and / or a dosing installation with a different injection angle be used, then it is enough that the mixing device is adapted by changing the length of the inner tube, to adjust the effect described above (secondary rupture). This also makes possible a modular construction method and / or a retrofitting system by corresponding selection of an internal tube of the preferred length.
    [0017] [00017] Another advantageous measure is to design the inlet cross section (that is, diameter or free opening of the inlet cross section) of the exhaust gas that is less than or equal to the length of the inner tube. In particular, a proportion of the cross section of the inlet gas discharge to the length of the inner tube in the range of 1: 1 to 1: 1.5 was verified. This results in a compact yet efficient mixing device.
    [0018] [00018] Depending on an advantageous configuration of the mixing device, it is provided that the inner tube passage is formed by a plurality of passage openings, the passage openings being preferably arranged in a circular ring or in a circular ring segment , particularly preferably the circular ring or the circular ring segment is arranged in the first third of length or in the first quarter of the inner tube facing the dosing installation. This arrangement of the passage openings close to the dosing device allows for homogeneous mixing and the small influence only of the introduction of liquid by the partial flow of exhaust gas. The passage openings can, for example, be made as slits, elongated holes or the like.
    [0019] [00019] The passage opening can also be performed as a fully continuous annular slot. The inner tube is then joined in a supportive and / or supporting manner by at least one thread with the housing. This at least one fillet is preferably arranged on the front side and within the contour channel. The bypass channel is the region in which the partial flow of exhaust gas passes from the passage opening to the premixed region located radially and internally. The fillet may also have a geometry, which allows a definite influence of the partial flow of exhaust gas passing through it (for example, its direction), for example, with the partial flow of exhaust gas being deflected by the fillet and / or placed in a rotating movement. In a concrete execution, the partial flow of exhaust gas deviates by at least 10º, preferably by at least 25º. In general, it is advantageous that the fillets are located equidistant in a circular line and whose geometry is configured at least similar, so that a partial flow deviation of exhaust gas through the periphery is also viable.
    [0020] [00020] In addition or alternatively, it can also be provided that the partial flow of exhaust gas from the inlet cross section to the passage openings will execute a movement against the main injection direction, before reaching the premix region. Also, the opening openings of the inner tube in a longitudinal direction can be arranged closer to the dosing installation than the region of the inlet cross section facing the dosing installation. These two individual or combinable forms of execution condition a greater path length for the partial exhaust gas flow than the path length for the main exhaust gas flow. This makes it possible and / or promotes the formation and / or adjustment of a sub-pressure or a suction effect in the premix chamber from the main discharge gas stream. The shortest stretch of the main exhaust gas flow compared to the partial flow of exhaust gas to the main mixing region produces the suction effect (and thus suppression) in a simple and effective way in the pre- Mix.
    [0021] [00021] The passage of the main discharge gas stream to the main mixing region occurs preferably through the passage of an annular gap at the end of the inner tube. The dimensioning and projection of the geometry of the annular gap, which is easy to define, makes it possible to easily and effectively adjust the underpressure conditions of the premix region.
    [0022] [00022] In another advantageous embodiment, the inner tube, the conductive element and / or at least one fillet are made by the cross section of the inner tube punctually symmetrical with the direction / main injection axis and / or the tube internal, the conductive element and / or the fillets are executed / arranged symmetrically in rotation, preferably around the direction / of the main injection axis. For example, the inner tube and the conducting element are executed as symmetrical bodies in rotation, which are aligned coaxially with each other and coaxially with the direction / axis of the main injection. In addition, then, the fillets can be made the same, so that they are symmetrical in rotation (for example, with a twist of 120º in three fillets or twist of 90º in four fillets, etc.). This symmetrical configuration allows for an easy-to-manufacture mixing device as well as positive current conditions with a high degree of homogenization of liquid and discharge gas.
    [0023] [00023] A simple and low-cost manufacture of the mixing device can be achieved, for example, by the fact that the housing, the inner tube, the conducting element and / or the deflecting element are performed in one piece, they preferably form a component cast in one piece or manufactured in a melting process (eg laser melting process or laser sintering).
    [0024] [00024] The invention is explained on the basis of examples of execution in the figures of the drawing. These show:
    [0025] [00025] Fig. 1 - a schematic longitudinal section of a first embodiment of the mixing device;
    [0026] [00026] Fig. 2 - a schematic longitudinal section of a second embodiment of the mixing device;
    [0027] [00027] Fig. 3 - a schematic longitudinal section of another embodiment of the mixing device;
    [0028] [00028] Fig. 4 - a representation in full section as detail C of figure 3;
    [0029] [00029] Fig. 5 - a representation in full section according to the cut line A-A of Figure 3;
    [0030] [00030] Fig. 6 - a full sectional representation of an alternative configuration to Fig. 4.
    [0031] [00031] In the mixing installation 1, exhaust gases 2 from an internal combustion engine (not shown) are supplied by the inlet cross-section 3 of a housing 4 of the mixing device 1 and, after passing the mixing device 1, added to a catalyst (not shown). Inside the housing 4 an inner tube 7 is arranged extending essentially parallel to a main injection direction 5 (shown as an arrow) of a dosing plant 6. Through the dosing plant 6, a liquid is introduced into the inner compartment 8 of the inner tube 7 9, for example, in the form of an injection - represented by the two jets 29, 30. The internal compartment 8 is thus defined as a premix region 10. The injection is introduced in the form of a cone or in the form of several injection cones , with the cone's symmetry axis or the symmetry axis of the various cones essentially forming the main injection axis. The main injection axis can also, in general, be considered as an imaginary line, around which the fundamental quantity of liquid 9 is introduced in a straight line into the internal compartment 8 of the inner tube 7. The exhaust gases 2 are mixed with the liquid 9. The main injection direction 5 and thus in Figure 1 the main injection axis also coincide and are coaxial to the longitudinal axis of the housing 4, the longitudinal axis of the housing 4 referring to the symmetrical region in rotation of the housing 4, therefore, the housing region 26 which follows region 13 in a spiral shape. Alternatively or - as shown in Figure 1 - in addition, the main injection direction can extend coaxial to the longitudinal axis of the inner tube 7.
    [0032] [00032] The housing 4 has a spiral-shaped housing segment A, which extends at least partially around the inner tube 7. By the spiral form, the exhaust gas 2 is uniformly adduced around the periphery of the inner tube 7. On the front side 11 of the housing 4, the dosing installation 6 is arranged.
    [0033] [00033] The main flow of exhaust gas 12 is deflected in the outer area (side area 14) of the inner tube 7 towards the main injection direction 5 and guided between the inner wall of the housing 4 and the outer area of the inner tube 7 and conducted to the main mixing region 16 arranged at the end 15 of the inner tube 7. Through the first region 13 at least in the spiral form of the housing 4, a component of uniform force is obtained, acting radially into the exhaust gas 2 on the tube internal 7. This results in a pressure activation by the symmetrical discharge gas 2, acting radially inward. A smaller partial discharge gas flow 17 compared to the mass and / or volume amount of the main discharge gas flow 12 is carried by an inner tube passage 18 through a bypass channel 19 to the pre-flow region. mix 10 and passes from there to the main mixing region 16 and thereby to the main exhaust gas stream 12. The premix region 10 is arranged closer to the metering plant 6 than the main mixing region 16 .
    [0034] [00034] The inner tube 7 has a cylindrical segment 20 and a tapering segment 21, with the tapering segment 21 of the metering installation 6 being arranged closer and / or pre-assembled in the direction of flow current S main exhaust gas 12. The tapering segment 21 reaches at least the outer lateral area 14 of the inner tube 7. The inner area may present a corresponding curvature - as shown in Figure 1 - or, according to Figure 2, present in the compartment inner tube 8 of the inner tube 7 a constant cross section.
    [0035] [00035] A conductive element 22 is arranged inside the inner tube 7 and prevents an activation of the liquid 9 with the partial flow of exhaust gas 17 passing through the bypass channel 19 in the introduction region 23 next to the metering and pre-assembled installation to the pre-mixing region 10. The conductive element 22 further diverts the partial flow of exhaust gas 17 in the direction of main injection 5, to the pre-mixing region 10. To this end, the conductive element 22 is executed in an annular manner and preferably symmetrical in rotation. On the inner side 24 of the conductive element 22, it is made cylindrical circular and in its cross section at least in its outer area tapering towards the free end 25.
    [0036] [00036] The length 27 of the conductive element 22 is less than the length 28 of the inner tube 7. As a result, the cross section expands in the premix region 10. The length 27 of the conductive element 22 is then less than a quarter of the length 28 of the inner tube 7.
    [0037] [00037] As shown in Figures 1 and 2 by the number of arrows representing the exhaust gas 2, the main exhaust gas flow as well as the partial exhaust gas flow 17, the main exhaust gas flow 12 corresponds essentially to 75% by vol. and the partial discharge gas flow 17 essentially 25% by vol. of the exhaust gas 2 entering.
    [0038] [00038] The injection angle α is the angle that results between the jets 29, 30 extending linearly from the center of the dosing plant 6, with the jets 29, 30 representing the essentially outer jet region of the introduction of liquid. The main injection direction 5 and / or the main injection axis is then the angular half of both jets 29, 30, as shown in Figure 1.
    [0039] [00039] The inlet cross section 3 and, thus, the cross section extension machine of the inlet region of the exhaust gas 2 are dimensioned in such a way that it is less than or equal to the length 28 of the inner tube 7, of preferably importing the inlet cross-section ratio 3 to the length 28 of the inner tube in 1: 1.3 to 1: 5.0. It is therefore advantageous that the cross section corresponds essentially (that is, +/- 10%) to the length of the segment 21 that tapers from the inner tube 7. By this adaptation, the discharge gas 2 is partly radially added, partly in rotation through the spiral shape of the housing 4, can be deflected with little loss by the tapering segment 21 of the inner tube 7.
    [0040] [00040] The passage of inner tube 18 is, according to the form of execution of Figures 4 and 5, formed with several passage openings 32 arranged equidistant in a circular line, being that circular line, considered along the longitudinal axis of the tube inner 7, is arranged in the room facing the dosing installation 6. Also the inner tube 7 as well as the conductive element 22 in the cross section as shown in Figure 5 - are punctually symmetrical towards the main injection direction 5. Also both the tube internal 7 as the conductive element 22 have a symmetrical rotating geometry and are aligned coaxially to the main injection direction 5 (center in Figure 5).
    [0041] [00041] Through the passage openings 32, the partial discharge gas flow 17 passes through the contour channel 19 to the premix region 10, with the partial gas flow 17 executing a movement in direction B, which extends in the opposite direction to the main injection direction 5. This "deviation" makes it possible to have a mixing device 1 of compact construction. This execution provides that the opening openings 32 of the inner tube 7 and / or the contour channel 19 are arranged in a longitudinal direction closer to the metering installation 6 than the region of the inlet cross-section 3 facing the metering installation 6 The facing region (limitation area 33) of the inlet cross section 3 should be understood as the closest limitation area 33 (here linear) of the inlet cross section 3. As represented in Figures 4 and 5, respectively, the contour 19 extends in a longitudinal direction closer to the metering installation 6 than the limiting area 33 of the inlet cross section 3. Another advantage of this execution is that by the "deviation" or by the return movement of the partial discharge gas flow 17 in direction B a component of rotational movement applied by the spiral housing to the exhaust gas is registered, so that the partial flow of exhaust gas 17 penetrating the premix region 10 does not a it has a rotation or at least one rotation less than the flow of the main exhaust gas 12.
    [0042] [00042] According to the execution of Figure 2, the contour channel 19 presents an enlarged space. The volume of the bypass channel 19 expands at least temporarily before the partial flow of exhaust gas 17 reaches the premix region; preferably the outlet to the premix region is provided with an opening segment reduced in diameter and aligned in the direction of the main injection direction 5. The enlarged segment of the contour channel 19 can act for greater removal of the rotation component in the partial discharge gas flow 17. In addition, as a result - as shown in Figure 2 - the impulse component in the partial discharge gas flow 17 added to the bypass channel is also abruptly reduced, so that the extended segment acts as " damping chamber "for partial discharge gas flow 17. LIST OF REFERENCES 1 Mixing device 2 Discharge gases 3 Inlet cross section 4 Accommodation 5 Main injection direction 6 Dosing installation 7 Inner tube 8 Internal compartment of 7 9 Net 10 Premix region 11 Front side 12 Main flow of exhaust gas 13 First region of 4 (spiral-shaped) 14 Side area of 7 15 End of 7 16 Main mixing region 17 Partial discharge gas flow 18 Internal tube passage 19 Contour channel 20 Cylindrical segment of 7 21 Tapered segment of 7 22 Conductive element 23 Introduction region 24 Inner side of 22 25 End of 22 26 Second region of 4 27 Length 22 28 Length of 7 29 Jet 30 Jet 31 Length of 21 32 Through opening 33 3 limitation area A Housing segment B Direction S Current direction
    权利要求:
    Claims (14)
    [0001]
    Mixing device (1) for further treatment of exhaust gases (2) in an exhaust gas equipment of an internal combustion engine, in which it comprises a housing (4) with an inlet cross section and an internal tube (7 ) arranged inside the housing (4), extending essentially parallel to a main injection direction (5) of a dosing plant (6) for adding a liquid and / or a liquid / gas mixture, with a region of premixing (10) carried out inside (8) of the inner tube (7), characterized by the fact that the housing (4) has a housing segment (13) in the form of a spiral and on a front side (11) of the housing (4) the dosing installation (6) is arranged, with a main flow of exhaust gas (12) being conducted between the housing (4) and the outer side area (14) of the inner tube (7) and adductible to a main mixing region (16), and a partial flow of exhaust gas (17) is adducible through a passage d and inner tube (18) to a premix region (10) closest to the metering installation, with the partial flow of exhaust gas (17) flowing through the premix region (10) in the main mixing region (16) and the main exhaust gas flow (12) comprises a fraction of a larger volume of exhaust gas than the partial flow of exhaust gas (17).
    [0002]
    Mixing device (1) according to claim 1, characterized in that the main injection direction (5) of the metering installation (6) is arranged essentially parallel and / or coaxial to the longitudinal axis of the housing (4) and / or to the longitudinal axis of the inner tube (7).
    [0003]
    Mixing device (1) according to claim 1 or 2, characterized in that the main exhaust gas flow comprises at least 70% by volume. of the exhaust gas (2) added to the inlet cross-section (3), preferably at least 80% by vol. of the exhaust gas (2), especially preferably at least 90% by vol. discharge gas flow (2).
    [0004]
    Mixing device (1) according to any one of the preceding claims, characterized in that the inner tube (7) comprises a cylindrical segment (20) and a tapering segment (21), the segment (21) being tapering is mounted before the cylindrical segment (20) in the current direction (S) of the main exhaust gas flow (12).
    [0005]
    Mixing device (1) according to any one of the preceding claims, characterized in that inside the inner tube (7) and / or just before the premix region (10) and / or at the front end of the pre-mix region mixing (10) by a conductive element (22) there is a deviation of the partial discharge gas flow (17) in the direction of the main injection direction (5).
    [0006]
    Mixing device (1) according to claim 5, characterized by the fact that the conductive element (22) is executed in the manner of a ring and / or symmetrical in rotation and preferably is performed on its inner side (24) circular cylindrical and / or tapering in its cross section to its free end (25).
    [0007]
    Mixing device (1) according to claim 5 or 6, characterized in that the length (27) of the conducting element (22) is shorter than the length (28) of the inner tube (7), preferably the length (27) of the conductive element (22) is shorter than the length (28) of the inner tube (7), particularly preferably the length (27) of the conductive element (22) is shorter than a quarter of the length (28) of the inner tube (7).
    [0008]
    Mixing device (1) according to any of the preceding claims, characterized in that the injection angle α is so selected that the injection essentially does not touch the inner wall of the inner tube (7) in the state not traversed by discharge gas flow.
    [0009]
    Mixing device (1) according to any one of the preceding claims, characterized in that the inlet cross section (3) of the exhaust gas is less than or equal to the length of the inner tube (7), regardless of the proportion of section Inlet cross section (3) of the exhaust gas (2) to the length (28) of the inner tube (7) matters in 1: 1 to 1: 1.5.
    [0010]
    Mixing device (1) according to any one of the preceding claims, characterized in that the inner tube passage (18) is formed by a plurality of passage openings (32), the passage openings (32) being they are preferably arranged in a circular ring or in a circular ring segment, particularly preferably the circular ring or the circular ring segment is arranged in the first third of length or in the first quarter of the inner tube (7) facing for the dosing installation (6).
    [0011]
    Mixing device (1) according to any one of the preceding claims, characterized in that the inner tube (7) is provided by fillets within the mixing device (1) and fillets are preferably arranged exclusively in the contour channel leading the partial flow of discharge gas (17) from the inlet region to the premix region (10).
    [0012]
    Mixing device (1) according to claim 11, characterized by the fact that at least one fillet is formed in such a way that the partial flow of discharge gas (17) passing through the fillet undergoes a definite change of direction, preferably a deviation of at least 10 °, with the geometry of the fillets being at least similar in particular, so that the deviation is viable at least similar.
    [0013]
    Mixing device according to any one of the preceding claims, characterized in that the partial flow of exhaust gas (17) from the inlet cross section to the passage openings must execute a movement (B) against the injection direction main (5) and / or that the passage openings and / or the contour channel (19) of the inner tube (7) in longitudinal direction are arranged closer to the metering installation (6) than the region of the cross section of inlet facing the dosing installation (6).
    [0014]
    Mixing device according to any one of the preceding claims, characterized in that the inner tube (7), the conductive element (22) and / or the fillet in the cross section is punctually symmetrical to the direction / to the main injection axis (5) and / or the inner tube (7), the conductive element (22) and / or the fillet has a symmetrical geometry in rotation, preferably around the main injection direction / axis (5).
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    同族专利:
    公开号 | 公开日
    BR102013017993A2|2015-06-30|
    EP2687286A3|2017-06-28|
    CN103573350A|2014-02-12|
    EP2687286B1|2021-03-31|
    CN103573350B|2019-01-11|
    RU2631591C2|2017-09-25|
    DE102012014333A1|2014-01-23|
    EP2687286A2|2014-01-22|
    RU2013130797A|2015-01-10|
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    法律状态:
    2015-06-30| B03A| Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette]|
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-03-10| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-02-17| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-04-06| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 15/07/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102012014333.8A|DE102012014333A1|2012-07-20|2012-07-20|Mixing device for aftertreatment of exhaust gases|
    DE102012014333.8|2012-07-20|
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