• 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:
    The present invention relates to an exhaust gas cooler comprising at least one exhaust pipe (12) dedicated to exhaust gases to be cooled, and is distinguished by the fact that at least one interstitial space (16) is provided at the intake (14) of at least one exhaust manifold (12), in the direction of the extent of at least one wall perpendicular to the direction of exhaust gas flow, between said wall of the tubing (12) and laterally adjacent structural components (22, 26).
    公开号:FR3071556A1
    申请号:FR1856850
    申请日:2018-07-24
    公开日:2019-03-29
    发明作者:Carsten Ohrem；Petr Sispera；Jurgen Nothbaum；Jiri Tomecek
    申请人:Hanon Systems Corp；
    IPC主号:
    专利说明:

    Description
    Title of the invention: Exhaust gas cooler and exhaust gas re-injection system equipped with an exhaust gas cooler The present invention relates to an exhaust gas cooler, as well as '' to an exhaust gas reinjection system equipped with at least one cooler of this type.
    In the field of internal combustion engines, it is usual to re-inject a certain volume of exhaust gas towards the fresh air side, with a view to lowering fuel consumption and reducing emissions . The reinjected gases must, at least under certain operating conditions, be cooled.
    It is known in this regard, for example from document JP 5941878 B2, to channel the exhaust gases via numerous exhaust pipes housed in a housing, which makes it possible to generate respectively , between the housing and the pipes or between said pipes, a flow comprising for example a coolant, in particular water and glycol. In this case, however, the cooler heats up in particular on the gas inlet side, which implies that it has a significantly higher temperature in this area than in the continuation of the route. This governs an uneven temperature distribution in the material of the cooler, and stresses accordingly. In particular variations in temperature, affecting both the gases and the coolant and attributable to the unstable operating behavior of the internal combustion engine (for example, cold start, alternating loads, exhaust gas recycling rate, etc.) result, in the presence of different thicknesses of materials, and therefore of different temperature variation rates, by additional homogeneity defects in the temperature distribution which generate the stresses described.
    Such homogeneity defects take a particularly critical form in the gas intake area because, firstly, the thin front edges of the exhaust pipes come into contact with the mass flow of hot exhaust gases not cooled and, due to the thinness of the walls, the induced heat can only be slowly transferred to the cooling water. Secondly, the exhaust pipes are usually connected, in the lateral direction, to a housing which has a markedly greater wall thickness and the temperature of which therefore varies with more pronounced inertia; or, respectively, the walls of said housing are not directly exposed to said mass flow of hot exhaust gases. In many applications, a thick-walled flange, located outside the housing, makes the situation even more complex. The heated tubing expands in the intake area, since the temperature of the housing and / or the flange has not yet varied enough to cause similar expansion, with different expansion governing constraints.
    The stresses result in plastic deformation in the thinner structural component, namely the front edge of the exhaust manifold which is pushed back and / or is curled. At the cooling stage, the relatively thin sheet cools more quickly, or all the structural components mentioned cool, of course, simultaneously, but the pressed sheet must nevertheless recover its initial location and expand, which creates tensile stresses in said front edge of the tubing. These alternating stress and plastic deformation result in the failure of the material constituting said tubing. In this context, it should also be taken into account that, during its useful life, an exhaust gas cooler must withstand several hundred thousand times the alternating stress described.
    In view of these background considerations, the object of the invention is to provide an exhaust gas cooler which is durably stable, and economical at the same time.
    According to the invention, this object is achieved by an exhaust gas cooler which, provided with at least one exhaust manifold dedicated to the exhaust gases to be cooled, is characterized by the fact that at least one interstitial space is provided at the intake of at least one exhaust pipe, in the direction of the extent of at least one wall perpendicular to the direction of the flow of the gases exhaust, between said wall of the tubing and neighboring structural components in the lateral direction.
    It is therefore expected, at the intake of at least one exhaust manifold, at least one interstitial space reserved relative to laterally neighboring structural components. In other words, at least one exhaust manifold, the direction of the extent of which is perpendicular to the direction of flow, is not attached to surrounding structural components such as a housing and / or a flange, for example; on the other hand, an interstitial space is located directly in the lateral vicinity of at least one wall of said tubing and at least on one side, preferably in the vicinity of all the walls, so that said tubing can expand freely, during of heating, perpendicular to said direction of flow. Thus, expansion is not the seat of the plastic stresses and deformations described above, which cause deterioration. The connection between the pipes and the housing is established downstream of the gas flow, at a location at which a homogeneous temperature distribution is expected. What is more, the coolant channel can advantageously be designed in such a way that it ensures good cooling of such a connection over all of the structural components.
    It will be observed, as a supplement, that the wall of the exhaust manifold, respectively concerned, can be considered as a thin plate extending, on the one hand, in the direction of flow and , on the other hand, perpendicular to this direction. In addition, the thickness direction of said plate also extends perpendicular to the direction of flow; in accordance with the invention, however, interstitial spaces should be provided not in the direction of the thickness, in other words above and / or below the wall when the latter is oriented horizontally, but rather in the lateral direction with respect to the latter, in other words "beside" said wall in the direction of the above-described area, perpendicular to the direction of flow. When, in this case, an interstitial space is provided on at least one side and preferably on both sides, in a manner other than that usual in the prior art, it can be taken advantage of the effect exerted by the invention.
    [OO1O] For the sake of completeness, it should also be observed that the exhaust gas cooler according to the invention is preferably provided with flattened tubes which can preferably be stacked so that the long sides of the rectangular cross section of such a flattened tube simultaneously forms the delimitation of exhaust pipes occupying contiguous locations. The interstitial spaces according to the invention are preferably provided for these long sides.
    Regarding the dimensioning of the interstitial space described, in the direction of flow of the exhaust gases, good results are expected in the presence of a minimum length or extent of 5 mm, and / or an extent maximum of 2 cm.
    The same goes for a dimensioning of at least 1 mm and / or measuring, at most, up to 5 mm perpendicular to the direction of flow.
    Preferably, with a view to a large heat transfer taking place from the exhaust gases to the cooling agent circulating around the exhaust pipes, at least one exhaust pipe is provided, in its internal space, ribs or fins which may be, preferably, of undulating construction in the direction of flow.
    The advantages provided by the invention can be exploited in particular in the presence of an exhaust gas cooler comprising at least one exhaust manifold provided with at least one wall having a thickness of 0.3 mm at 0.5 mm. Such tubing is relatively thin, and therefore "light", the measures according to the invention making it possible, at the same time, to avoid damage to the intake.
    At least one exhaust pipe is typically surrounded by a housing and / or a flange provided (e), preferably, at least one wall having a thickness of 1 mm to 1.5 mm and / or a thickness of 5 mm to 8 mm. In this way, said housing and / or said flange is (are) significantly thicker (s) and more stable (s) than the exhaust pipes and thus generally gives the exhaust gas cooler advantageous stability. Simultaneously, due to the measure according to the invention, they do not permanently block the intake areas of the pipes, which makes it possible to avoid the problems described.
    Preferably, other interstitial spaces are provided at other locations along the route of at least one exhaust pipe, in the direction of flow, and laterally adjoin said pipe, which, in this case, authorizes an enveloping flow with cooling agent and concomitantly makes it possible to obtain, in well-defined locations, between the interstitial spaces described, a well-defined attachment of the pipes operated, for example, on the surrounding housing.
    The exhaust gas cooler according to the invention offers particular advantages when it is used as an exhaust gas reinjection cooler.
    The present application further relates, correspondingly, an exhaust gas reinjection system, equipped with at least one cooler of this type.
    A preferred embodiment of the invention, illustrated in the figures, is the subject of a detailed comment below. In the drawings:
    Figure 1 is a partial perspective view of an exhaust gas cooler according to the invention; and [0021] Figure 2 is a section through the intake area of an exhaust gas cooler according to the invention.
    As highlighted by Figure 1, an exhaust gas cooler 10 according to the invention has, in the illustrated case, a substantially rectangular cross section and a slender extent (to the left in the upper part in Figure 1). By means of a flange 22, said cooler can be respectively connected to a pipe (not shown) (for re-injection) of exhaust gas, or connected to a valve casing, in particular an EGR valve (for recycling of exhaust gases). 'exhaust), or to an EGR module. Said flange may, for example, have come from a foundry; the walls of the exhaust pipes, described below, the ribs provided in the latter, and the housing, can be made of bent or correspondingly bent sheet metal. Numerous exhaust pipes 12, housed in the internal space of the cooler, are formed essentially by metal plates 20 oriented parallel to each other, by relatively flat side walls, and by ribs or fins 18 respectively placed between the latter, which is best seen from the section above FIG. 2. Thus, said plates 20 form walls of the exhaust pipes appearing as relatively thin flattened tubes which can therefore suffer deterioration. resulting from expansion and contraction, as described above.
    An observation of Figure 2 reveals the presence, between the flange 22 and the exhaust pipe 12, of a housing 26 which surrounds the many pipes 12 so that said pipes, closed in the lateral direction, can bathe in a coolant, such as water, to cool the exhaust gases passing through them.
    The housing 26 is, in each case, externally connected to the solid flange 22, knowing however that it is reserved in accordance with the invention, at an intake 14 of the exhaust pipe 12 considered and in the lateral direction with respect to the latter, as highlighted on the left and on the right in FIG. 2, an interstitial space 16 which advantageously allows expansion of said exhaust manifold during heating caused by the circulation of hot exhaust gases. The extent in the lateral direction, in other words perpendicular to the direction of flow (from bottom to top in Figure 2), is highlighted to the left and right in Figure 2. The extent of interstitial spaces 16 in the direction of flow, up to a zone 28 for fixing the exhaust manifold to the housing 26, similarly offers a trace from bottom to top, in FIG. 2, and preferably measures from 5 mm to 2 cm. Other interstitial spaces 24 are provided in the continuation of the route of the connection between said housing 26 and said tubing 12.
    In addition, Figure 2 highlights the corrugated configuration of the ribs 18, extending in the direction of flow in the illustrated embodiment.
    In the embodiment shown, the attachment zone 28 extends at least a few millimeters, for example 5 mm, and / or up to 2 cm in the direction of flow. Correspondingly, this highlights the following consideration: if, in such an embodiment, the fixing zone 28 was provided directly at the end situated upstream on the wall 20, and therefore at the intake level, it is impossible to deliver a coolant to this location due to the extent of said zone 28 in the direction of flow. Consequently, the problem described above arises, resolved by the interstitial space 16 according to the invention, which shifts said zone 28 to a certain extent downstream in said direction of flow.
    In the illustrated embodiment, the flange 22 has a thickness which, measured in the direction of flow, is greater than the extent of the interstitial space 16 in order to obtain, overall, a stable achievement.
    In accordance with the exemplary embodiment, the exhaust gas cooler comprises two inlets arranged in juxtaposition and “stacked” groups of exhaust pipes which are connected thereto, but said cooler according to the invention can however also include a single intake and a group of exhaust pipes connecting thereto, as well as more than two intake and exhaust pipes correspondingly provided.
    It therefore goes without saying that many modifications can be made to the invention as described and shown, without departing from the scope of the latter.
    权利要求:
    Claims (1)
    [1" id="c-fr-0001]
    Claims [Claim 1] Exhaust gas cooler (10) provided with at least one exhaust pipe (12) dedicated to exhaust gases to be cooled, cooler characterized in that at least one interstitial space (16) is provided at the intake (14) of at least one exhaust pipe (12), in the direction of the extent of at least one wall perpendicular to the direction of the flow of gases exhaust, between said wall (20) of the pipe (12) and structural components (22, 26) adjacent in the lateral direction.
    [Claim 2] Cooler according to claim 1, characterized in that at least one interstitial space (16) has an extent of at least 5 mm and possibly, or alternatively, of 2 cm maximum in the direction of the exhaust gas flow.
    [Claim 3] Cooler according to claim 1 or 2, characterized in that at least one interstitial space (16) has an extent of at least 1 mm and possibly, or alternatively, of 5 mm at most in one direction perpendicular to the direction of the exhaust gas flow.
    [Claim 4] Cooler according to any one of the preceding claims, characterized in that at least one exhaust pipe (12) is provided with ribs (18) in its internal space.
    [Claim 5] Cooler according to any one of the preceding claims, characterized in that at least one exhaust pipe (12) is provided with at least one wall (20) having a thickness of 0.3 mm at 0.5 mm.
    [Claim 6] Cooler according to any one of the preceding claims, characterized in that at least one exhaust pipe (12) is surrounded by a housing (26) and optionally, or alternatively, by a flange (22 ).
    [Claim 7] Cooler according to claim 6, characterized in that the housing (26) is provided with at least one wall having a thickness of 1 mm to 1.5 mm and optionally, or alternatively, at least a flange (22) with a thickness of 5 mm to 8 mm.
    [Claim 8] Cooler according to any one of the preceding claims, characterized in that interstitial spaces (24) are provided at other locations in the layout of at least one exhaust pipe (12), in the direction flow, and laterally adjoin said tubing (12).
    [Claim 9] Cooler according to any one of the preceding claims, characterized in that the said cooler (10) is an exhaust gas re-injection cooler.
    [Claim 10] Exhaust gas reinjection system, equipped with at least one exhaust gas cooler according to claim 9.
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    引用文献:
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    法律状态:
    2019-06-21| PLFP| Fee payment|Year of fee payment: 2 |
    2020-05-22| PLSC| Search report ready|Effective date: 20200522 |
    2020-07-03| PLFP| Fee payment|Year of fee payment: 3 |
    2021-07-28| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102017216819.6|2017-09-22|
    DE102017216819.6A|DE102017216819B4|2017-09-22|2017-09-22|Exhaust gas cooler and exhaust gas recirculation system with one exhaust gas cooler|
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