Claims:We Claim:
1. An exhaust treatment system (1) for a vehicle, the exhaust treatment system (1) comprising:
an exhaust pipe (10) adapted to guide and direct exhaust gas from a vehicle engine to the exhaust treatment system (1);
an injector (14) for injecting an exhaust treating agent into the exhaust pipe (10); and
a mixer assembly (100) including a plate shaped mixer body (50) with an upstream flow side (5-1) and a downstream flow side (5-2) with respect to a main exhaust gas flow direction (5);
wherein the plate shaped mixer body (50) includes an elongated curved shaped slot (51) extending around the circumference of the plate shaped mixer body (50);
wherein the elongated curved shaped slot (51) is covered by a curved-shaped member (8) such that a first opening (8-1) and a second opening (8-2) is created in between the elongated curved shaped slot (51) and the curved-shaped member (8) at the downstream flow side (5-2) for producing symmetric swirling of the exhaust gas and the exhaust treating agent.

2. The exhaust treatment system (1) as claimed in claim 1, wherein the plate shaped mixer body (50) is arranged in the exhaust pipe (10) of the exhaust after-treatment system (1) such that the circumference of the plate shaped mixer body (50) is air-tightly fixed with an inner surface of the exhaust pipe (10).
3. The exhaust treatment system (1) as claimed in claim 1, wherein the exhaust pipe (10) comprises a diesel oxidation catalytic (DOC) converter (12) arranged at the upstream flow side (5-1) and a selective catalytic reduction (SCR) catalytic converter (13) arranged at the downstream flow side (5-2) and in between of the DOC converter (12) and SCR catalytic convertor (13) the plate shaped mixer body (50) is disposed.

4. The exhaust treatment system (1) as claimed in claim 1, wherein the injector (14) is positioned at or on the exhaust pipe (10) such that the exhaust treating agent is sprayed in a space upstream of the plate shape mixer body (50) into the exhaust pipe (10).

5. The exhaust treatment system (1) as claimed in claim 1, wherein the first opening (8-1) and the second opening (8-2) are arranged at opposite extremity of the curve-shaped member (8) and opens to a plane substantially perpendicular to the plate shaped mixer body (50) such that the mixer of the exhaust gas and exhaust gas treating agent flows substantially parallel to the plate shaped mixer body (50).

6. The exhaust treatment system (1) as claimed in claim 1, wherein the plate shaped mixer body (50) comprises one or more passage hole (52) arranged above and/or around a central area of the plate shaped mixer body (50).

7. A mixer assembly (100) for an exhaust after-treatment system of a vehicle, comprising:
a plate shaped mixer body (50) with an upstream flow side (5-1) and a downstream flow side (5-2, with respect to an exhaust gas main flow direction (5); wherein the plate shaped mixer body (50) includes an elongated curved shaped slot (51) extending around the circumference of the plate shaped mixer body (50), wherein the elongated curved shaped slot (51) is covered by a curved-shaped member (8) such that a first opening (8-1) and a second opening (8-2) is created in between the elongated curved shaped slot (51) and the curved-shaped member (8) at the downstream flow side (5-2) for producing symmetric swirling of the exhaust gas and an exhaust treating agent.
, Description:Field of the Invention

[0001] The present disclosure relates to the field of an exhaust treatment system for a vehicle. More particularly, the present disclosure relates to a mixer assembly which can improve overall effectiveness of the exhaust treatment system of the vehicle.

Background of the Invention

[0002] In conventional vehicles generally due to space constraint the SCR catalyst and mixer are assembled as a module which may result into less effective exhaust treatment system and may also requires more time for assembling and also increase the overall manufacturing costs.

[0003] Therefore, there is a need to overcome at least some of the above drawback(s) and provide an improved and cost-effective mixer assembly of an exhaust treatment system for a vehicle with a mixer assembly being able to thoroughly mix the injected fluid with the exhaust gases to develop homogeneous mixing specially in compact and package sensitive design.

Objects of the Invention

[0004] Some of the objectives of the present invention, which at least one embodiment herein satisfies are as listed herein below.

[0005] It is an object of the present invention to provide an exhaust treatment system having a mixer assembly designed for improving overall effectiveness of the exhaust treatment system.

[0006] It is an object of the present disclosure to provide an exhaust treatment system having a mixer assembly designed for a compact and package sensitive design.

[0007] It is an object of the present disclosure to provide a mixer assembly with a lesser number of elements or component without using any cumbersome design.

[0008] It is an object of the present disclosure to provide a mixer assembly, which is lean and compact design.

[0009] It is an object of the present disclosure to provide a mixer assembly being able to thoroughly mix the injected fluid with the exhaust gases to develop homogeneous mixing.

[0010] It is an object of the present disclosure to provide a mixer assembly being able to produce symmetric swirling of the exhaust gas and the exhaust treating agent resulting in an improved overall effectiveness of the exhaust treatment system.

Summary of the invention

[0011] The present disclosure relates to the field of an exhaust treatment system for a vehicle. More particularly, the present disclosure relates to a mixer assembly which can improve overall effectiveness of the exhaust treatment system.

[0012] An aspect of the present invention relates to an exhaust treatment system for a vehicle. The exhaust treatment system includes an exhaust pipe adapted to guide and direct an exhaust gas from the engine to the exhaust treatment system, an injector for injecting an exhaust treating agent into the exhaust pipe, the mixer assembly comprising a plate shaped mixer body with an upstream flow side and a downstream flow side with respect to a main exhaust gas flow direction. The plate shaped mixer body includes an elongated curved shaped slot extending around the circumference or perimeter of the plate shaped mixer body. Further, the elongated curved shaped slot is covered by a curved-shaped member such that a first opening and a second opening is created in between the elongated curved shaped slot and the curved-shaped member at the downstream flow side for producing symmetric swirling of the exhaust gas and the exhaust treating agent.

[0013] In an aspect, the plate shaped mixer body is arranged in an exhaust pipe of the exhaust after-treatment system such that the circumference or perimeter of the plate shaped mixer body is air-tightly fixed with an inner surface of the exhaust pipe.

[0014] In an aspect, the exhaust pipe comprises a diesel oxidation catalytic (DOC) converter arranged at the upstream flow side and a selective catalytic reduction (SCR) catalytic converter arranged at the downstream flow side and in between the DOC converter and SCR catalytic convertor the plate shaped mixer body is disposed.

[0015] In an aspect, the injector is positioned at or on the exhaust pipe such that the exhaust treating agent is sprayed in a space upstream of the plate shaped mixer body into the exhaust pipe. More particularly, in-between the DOC converter and the plate shaped mixer body. Thus, the exhaust treating agent and the exhaust gas firstly mixed prior to the mixer assembly and then the mixer of the exhaust gas and the exhaust treating agent flows towards the curved-shaped member of the plate shaped mixer body which produces symmetric swirling of the mixed exhaust gas and the exhaust treating agent which results into better mixing of the exhaust treating agent and the exhaust gas.
[0016] In an aspect, the first opening and the second opening are arranged at opposite extremity of the curve-shaped member and opens to a plane substantially perpendicular to the plate shaped mixer body such that the mixer of the exhaust gas and exhaust gas treating agent flows parallel to the plate shaped mixer body for producing symmetric swirling of the exhaust gas and the exhaust treating agent.

[0017] In an aspect, the plate shaped mixer body comprises one or more passage hole arranged above and/or below the elongated curved shaped slot and/or also around the central area of the plate shaped mixer body.

[0018] In another aspect, a mixer assembly for an exhaust after-treatment system of a vehicle includes a plate shaped mixer body with an upstream flow side, with respect to an exhaust gas main flow direction and a downstream flow side. The plate shaped mixer body includes an elongated curved shaped slot extending around the circumference or perimeter of the plate shaped mixer body. The elongated curved shaped slot is covered by a curved-shaped member such that a first opening and a second opening is created in between the elongated curved shaped slot and the curved-shaped member at the downstream flow side for producing symmetric swirling of the exhaust gas and an exhaust treating agent.

Brief Description of the Drawings

[0019] The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. The diagrams are for illustration only, which thus is not a limitation of the present disclosure.

[0020] In the figures, similar components and/or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label with a second label that distinguishes among the similar components. If only the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label.

[0021] Figure 1 illustrates an exemplary view of a proposed exhaust treatment system for a vehicle, in accordance with an embodiment of the present invention;

[0022] Figure 2a illustrates an exemplary view of a mixer assembly of the exhaust treatment system for a vehicle illustrating a curved-shaped member enabling the symmetric swirling of the exhaust gas and an exhaust treating agent, in accordance with an embodiment of the present invention;
[0023] Figure 2b illustrates a side view of the figure 2a, in accordance with an embodiment of the present invention;

[0024] Figures 3a and 3b illustrates an exemplary view of the mixer assembly and the curved-shaped member separately, in accordance with an embodiment of the present invention;

[0025] Figure 4 illustrates an exemplary view of the mixer assembly including two curved-shaped cover members, in accordance with a second embodiment of the present invention; and

[0026] Figure 5 illustrates the swirling effect of the of the exhaust gas and the exhaust treating agent when the mixer of the exhaust gas and the exhaust treating agent flows towards the curved-shaped member.

Detailed Description of the Invention

[0027] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.

[0028] In the following description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the present invention. It will be apparent to one skilled in the art that embodiments of the present invention may be practiced without some of these specific details.

[0029] The present disclosure relates to an exhaust treatment system for a vehicle which produces symmetric swirling of the exhaust gas and the exhaust treating agent.

[0030] Referring to figure 1, according to an embodiment, an exhaust treatment system (1) for a vehicle is shown. The exhaust treatment system (1) includes an exhaust pipe (10) adapted to guide and direct an exhaust gas from the engine to the exhaust treatment system (1), an injector (14) for injecting an exhaust treating agent into the exhaust pipe (10), and a mixer assembly (100).

[0031] In an embodiment as shown in figure 1, a plate shaped mixer body (50) is arranged in the exhaust pipe (10) of the exhaust after-treatment system (1) such that the circumference (or perimeter) of the plate shaped mixer body (50) is air-tightly fixed with an inner surface of the exhaust pipe (10). Further, the exhaust pipe (10) comprises a diesel oxidation catalytic (DOC) converter (12) arranged at an upstream flow side (5-1) and a selective catalytic reduction (SCR) catalytic converter (13) arranged at a downstream flow side (5-2) and in between of the DOC converter (12) and SCR catalytic convertor (13) the plate shaped mixer body (50) is disposed.

[0032] Referring to figures 2a and 2b, the mixer assembly (100) comprising the plate shaped mixer body (50) with the upstream flow side (5-1) and the downstream flow side (5-2) with respect to a main exhaust gas flow direction (5). Particularly, the plate shaped mixer body (50) includes an elongated curved shaped slot (51) extending around the circumference (or perimeter) of the plate shaped mixer body (50). Further, the elongated curved shaped slot (51) is covered by a curved-shaped member (8) such that a first opening (8-1) and a second opening (8-2) is created in between the elongated curved shaped slot (51) and the curved-shaped member (8) at the downstream flow side (5-2) for producing symmetric swirling of the exhaust gas and the exhaust treating agent as shown in figure 5.

[0033] Further in an embodiment, the injector (14) is positioned at or on the exhaust pipe (10) (as shown in figure 1) such that the exhaust treating agent is sprayed in a space upstream of the plate shaped mixer body (50) into the exhaust pipe (10), where the mixer of the exhaust treating agent and exhaust gas flows towards the curved-shaped member (8) of the plate shaped mixer body (50) which produces symmetric swirling of the exhaust gas and the exhaust treating agent. Particularly, an impactor is arranged in the space upstream of the plate shape mixer body (50) such that the exhaust treating agent strikes on the impactor which breaks the exhaust treating agent into small droplets resulting in initial mix of exhaust gas and reductant agent.

[0034] Now referring to figure 2a, 3a and 3b in detail, the first opening (8-1) and the second opening (8-2) are arranged at opposite extremity of the curve-shaped member (8) and opens to a plane substantially perpendicular to the plate shaped mixer body (50) such that the mixer of the exhaust gas and exhaust gas treating agent flows substantially parallel to the plate shaped mixer body (50). In an aspect of the invention, the mixer of the exhaust gas and exhaust gas treating agent flows almost parallelly or with a tolerance of 5-10 degrees to the plate shaped mixer body (50).

[0035] Further in an embodiment as shown in figure 2a, the plate shaped mixer body (50) comprises one or more passage hole (52) arranged above the elongated curved shaped slot (51) and/or around the central area of the plate shaped mixer body (50).

[0036] In an implementation, firstly the exhaust gas from engine flows into the exhaust pipe (10) pass through the DOC (12) and then mixed with the exhaust treatment agent injected by the injector (14) which is of a cone shape. Then, the mixer of the exhaust gas and the exhaust treating agent flows towards the curved-shaped member (8) and the one or more passage hole (52) of the plate shaped mixer body (50) which produces symmetric swirling of the mixed exhaust gas and the exhaust treating agent which results into better mixing of the exhaust treating agent and is finally before exhausting into the environment passes through the SCR (13) to exhaust clean exhaust gases.

[0037] Now referring to figure 4, the mixer assembly (100) for an exhaust after-treatment system of a vehicle is shown. The mixer assembly (100) includes the plate shaped mixer body (50) with the upstream flow side (5-1) and the downstream flow side (5-2), with respect to an exhaust gas main flow direction (5). The plate shaped mixer body (50) includes atleast an elongated curved shaped slot (51) extending around the circumference of the plate shaped mixer body (50). The elongated curved shaped slot (51) is covered by the curved-shaped member (8) such that a first opening (8-1) and a second opening (8-2) is created in between the elongated curved shaped slot (51) and the curved-shaped member (8) at the downstream flow side (5-2). Particularly referring fig. 3a, 3b and 4, two sets of curved shaped slot (51) and the respective curved-shaped member (8) is shown. Two sets of curved shaped slot and curved shaped members can improve mixing performances. It may be obvious to a person skilled in the art to use more than two sets of curved shaped slot and curved shaped members in the mixer assembly (100) to improve the mixing performances.

[0038] Moreover, in interpreting the specification, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced. Where the specification claims refer to at least one of something selected from the group consisting of A, B, C ….and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc.

[0039] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

[0040] The proposed invention provides an advantage of cost-effective, lean and compact design and easy to assemble mixer assembly (100).