Claims:1. A mixer assembly (100) for an exhaust treatment system, the mixer assembly (100) comprising:
a swirl mixer (102) comprising a set of first blades (102-1) with a first opening (102-2) configured circumferentially over the swirl mixer (102),
a first baffle (106) comprising a set of first louvers (106-1) configured at a first side of the swirl mixer (102);
a blocking baffle (110) comprising a central opening (110-1) configured on a second side opposite to the first side, of the swirl mixer (102); and
a set of second blades (112) configured over the blocking baffle (110) and extending outward from the central opening (110-1).
2. The mixer assembly (100) as claimed in claim 1, wherein the mixer assembly (100) comprises a second baffle (108) having a set of second louvers (108-1) configured on the second side of the swirl mixer (102) such that the set of second blades (112) are in between the blocking baffle (110) and the second baffle (108), and a second opening is formed between the two adjacent second blades (112).
3. The mixer assembly (100) as claimed in claim 2, wherein a central portion of the second baffle (108) comprises a set of perforations (108-2) in line with the central opening (110-1) of the blocking baffle (110).
4. The mixer assembly (100) as claimed in claim 1, wherein the swirl mixer (102) is a cylindrical shell having the set of first blades (102-1) inclined at a first angle and extending outward from an outer surface of the cylindrical shell, and oriented parallel to a longitudinal axis of the swirl mixer (102), and wherein the corresponding first openings (102-2) are configured on the cylindrical shell, beneath the set of first blades (102-1), wherein when an exhaust gas enters into the mixer assembly (100) through any or a combination of the first openings of the swirl mixer (102), and the set of first louvers (106-1), a swirl of the exhaust gas is created within the swirl mixer (102), which correspondingly facilitates mixing and/or vaporization of the injected ETF and the exhaust gas.
5. The mixer assembly (100) as claimed in claim 1, wherein the set of first louvers (106-1) are oriented perpendicular to a longitudinal axis of the first baffle (106) such that each of the first louvers (106-1) are configured radially over the surface of the first baffle (106) with a second angle between the two adjacent first louvers (106-1).
6. The mixer assembly (100) as claimed in claim 2, wherein the set of second louvers (108-1) are oriented perpendicular to a longitudinal axis of the second baffle (108) such that each of the second louvers (108-1) are configured radially over the surface of the second baffle (108) with a third angle between the two adjacent second louvers (108-1).
7. The mixer assembly (100) as claimed in claim 1, wherein the set of second blades (112) have a curved profile such that a concave surface of one of the second blades (112) faces a convex surface of the adjacent second blade.
8. The mixer assembly (100) as claimed in claim 1, wherein the mixer assembly (100) is co-axially disposed within a cylindrical housing (114) having an internal diameter equal to an external diameter of the blocking baffle (110), wherein the swirl mixer (102) has a cone shaped integral portion (104) at least partially extending out towards the cylindrical housing (114) of the mixer assembly (100, and a mounting support (104-1) is arranged on the cylindrical housing (114) to fix an injector that is fluidically coupled to the swirl mixer (102) for injection of an exhaust treating fluid (ETF) into the cone shape portion (104) of the swirl mixer (102).
9. The mixer assembly (100) as claimed in claim 3, wherein the exhaust gas mixed ETF exits the mixer assembly (100) through any or a combination of the second openings associated with the second set of blades, the set of perforations, and the set of second louvers (108-1), which further creates a swirl of the exhaust gas mixed ETF and facilitates uniform distribution of the exhaust gas mixed ETF over a selective catalyst reduction (SCR) substrate associated with the exhaust treatment system.
10. The mixer assembly (100) as claimed in claim 1, wherein the mixer assembly (100) is adapted to be configured with the exhaust treatment system associated with a vehicle, and/or a diesel-powered electrical generator, and wherein the ETF is a diesel exhaust fluid (DEF).
, Description:TECHNICAL FIELD
[0001] The present disclosure relates to the field of exhaust treatment systems, and more particularly the present disclosure relates to a compact and efficient mixer assembly with improved mixing performance and reduced backpressure for an exhaust treatment system of a vehicle and/or a diesel power generator, which efficiently mixes an exhaust treating fluid (ETF) or diesel exhaust fluid (DEF) with exhaust gas and uniformly distributes the ETF/DEF mixed exhaust over a selective catalytic reduction (SCR) substrate.

BACKGROUND
[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] An exhaust treatment system (system) is employed in vehicles, diesel power generators, and industries to reduce or neutralize harmful pollutants present in exhaust gases before releasing the exhaust gas into the atmosphere. The system conducts the generated exhaust gases through various components and processes to reduce emissions and neutralize the pollutants. In existing systems, an injector sprays a diesel exhaust fluid (DEF) or reducing reagents such as urea or urea water solution, upstream of a selective catalytic reduction (SCR) catalyst. Further, a mixer or mixer assembly mixes the DEF into the stream of exhaust gases to transform the urea into ammonia before reaching the SCR catalyst, which further helps neutralize the harmful pollutants from the exhaust gases.
[0004] Existing mixers used in the exhaust treatment system of vehicles include a housing configured in a conduit that connects the exhaust of the vehicle to the SCR catalyst. The mixer further includes an opening that accommodates the injector and allows spraying of the DEF into the stream of the exhaust gas flowing through the housing. For effective treatment of exhaust gas, fine droplets of DEF mixed with exhaust gas are required to be uniformly distributed over the SCR catalyst. However, the mixer assembly of the existing treatment systems simply sprays the DEF over the stream of exhaust gases but fails to effectively mix them and vaporize the DEF
[0005] In existing mixers, baffles having openings are attached to the front and rear sides of the housing to increase the mixing time of the DEF with the exhaust gas within the housing. However, the baffles increase the backpressure in the mixer and also cause deposition of the DEF within the housing as well as in the injector area, and also cause impinging of the DEF on the front baffle. Besides, cold spots are also created within the existing mixer, which is highly undesirable and makes the mixer inefficient. Such mixers increase the mixing of DEF with exhaust gases to some extent, still, they fail to effectively vaporize the DEF and also fail to uniformly distribute the DEF mixed exhaust (NH3 rich exhaust gas) onto the SCR substrate. In addition, the existing mixers are bulky, which makes them difficult to be efficiently configured with the exhaust of the vehicles.
[0006] There is, therefore, a need to overcome the above drawback, limitations, and shortcomings associated with existing mixer assemblies and provide a compact and efficient mixer assembly, with improved mixing performance and reduced backpressure for an exhaust treatment system of a vehicle and/or a diesel power generator, which efficiently mixes an exhaust treating fluid or diesel exhaust fluid (DEF) with exhaust gas and uniformly distribute the DEF mixed exhaust over a selective catalytic reduction (SCR) substrate.

OBJECTS OF THE PRESENT DISCLOSURE
[0007] Some of the objects of the present disclosure, which at least one embodiment herein satisfies are as listed herein below.
[0008] It is an objective of the present disclosure to uniformly mix an exhaust treating fluid or pollutant neutralizing fluid with exhaust gas.
[0009] It is an objective of the present disclosure to reduce backpressure and SCR deposits in a mixer assembly of an exhaust treatment system.
[0010] It is an objective of the present disclosure to provide a mixer assembly for an exhaust treatment system, which uniformly mixes an exhaust treating fluid or pollutant neutralizing fluid such as diesel exhaust fluid (DEF) with exhaust gas.
[0011] It is an objective of the present disclosure to provide a compact and efficient mixer assembly with improved performance and reduced backpressure for an exhaust treatment system of a vehicle and/or a diesel power generator.
[0012] It is an objective of the present disclosure to provide a compact and improved mixer assembly for an exhaust treatment system of a vehicle and/or a diesel generator, which efficiently mixes a diesel exhaust fluid (DEF) with exhaust gas and uniformly distributes the DEF mixed exhaust (NH3 rich exhaust gas) over a selective catalytic reduction (SCR) substrate.
[0013] It is an objective of the present invention to prevent the creation of cold spots within a mixer assembly of an exhaust treatment system.

SUMMARY
[0014] The present disclosure relates to a compact and efficient mixer assembly with improved performance and reduced backpressure for an exhaust treatment system of a vehicle and/or a diesel generator, which efficiently mixes an exhaust treating fluid (ETF) or diesel exhaust fluid (DEF) with exhaust gas and uniformly distributes the ETF/DEF mixed exhaust over a selective catalytic reduction (SCR) substrate.
[0015] An aspect of the present disclosure pertains to mixer assembly for an exhaust treatment system of a vehicle, diesel power generator, and exhaust of industries. The mixer assembly may comprise a swirl mixer comprising a set of swirl mixer blades (first blades) with a first opening arranged circumferentially over the swirl mixer. A first baffle having a set of first louvers, and a second baffle having a set of second louvers may be configured at a first side and a second side, respectively of the swirl mixer. The mixer assembly may comprise a blocking baffle having a central opening being configured on the second side of the swirl mixer. The mixer assembly may further comprise a set of second blades configured over the blocking baffle and extending outward from the central opening. Further, a second baffle having a set of second louvers may be configured on the second side of the swirl mixer such that the set of second blades are in between the blocking baffle and the second baffle, and a second opening is formed between the two adjacent second blades.
[0016] In an aspect, a central portion of the second baffle comprises a set of perforations that may be substantially in line with the central opening of the blocking baffle. Further, the set of second blades may have a curved profile such that a concave surface of one of the second blades faces a convex surface of the adjacent second blade.
[0017] A portion of the exhaust gas may enter into the mixer assembly through the first openings of the swirl mixer to create a swirl whose axis is parallel to the SCR substrate axis, and the remaining portion of the exhaust gas may enter into the mixer assembly through the first louvers, generating a swirl near the first baffle keeping away the DEF particles impinging on the first baffle. Further, the DEF particles may be carried by this swirl and breakup into smaller particles, and then vaporizes. Further, the swirl of DEF mixed exhaust gas that was created at the first side of the swirl mixer may go to the second side of the mixer assembly through the second openings associated with the second blades. The second blades and the second louvers of the second baffle may further create a swirl effect that can further vaporize the particles of the DEF and also facilitate uniform spreading of the exhaust gas mixed DEF over a selective catalyst reduction (SCR) substrate associated with the exhaust treatment system.
[0018] Accordingly, the creation of the swirl at the first side as well as at the second side of the mixer assembly helps the ETF/DEF particles to have a longer path for the breakup and mixing, thereby efficiently mixing the DEF with the exhaust gas and uniformly distributes the ETF/DEF mixed exhaust (NH3 rich exhaust gas) over the SCR substrate. In addition, the perforations at the central portion of the second baffle also prevent the creation of catalyst cold spots at the center of the swirl within the mixer assembly.
[0019] In an aspect, the swirl mixer may be a cylindrical shell having the set of first blades inclined at a given angle and extending outward from an outer surface of the cylindrical shell, oriented parallel to a longitudinal axis of the swirl mixer. Further, the first openings may be configured on the cylindrical shell, beneath the set of first blades.
[0020] In an aspect, the set of first louvers may be oriented perpendicular to a longitudinal axis of the first baffle such that each of the first louvers is configured radially over the surface of the first baffle with a desired angle between the two adjacent first louvers. Similarly, the set of second louvers may be oriented perpendicular to a longitudinal axis of the second baffle such that each of the second louvers is configured radially over the surface of the second baffle with a desired angle between the two adjacent second louvers.
[0021] In an aspect, the mixing assembly may be co-axially disposed within a cylindrical housing having an internal diameter equal to an external diameter of the blocking baffle. Further, the swirl mixer may have an integral cone shaped portion at least partially extending out towards the cylindrical housing of the mixer assembly, and a mounting support arranged on the cylindrical housing to fix an injector that may be fluidically coupled to the swirl mixer for injection of an exhaust treating fluid (ETF) into the cone shaped portion of the swirl mixer.
[0022] In another aspect, the proposed mixer assembly may also be implemented in other exhaust treatment systems, where the injector may inject an exhaust treating fluid or pollutant neutralizing fluid specific to certain pollutants to be neutralized, in the swirl mixer, and may allow the swirl mixer to create the swirl and uniformly mix the fluid with the stream of exhaust gas. This may allow the fluid to efficiently interact with the exhaust gas for a sufficient time and neutralize the specific pollutants before being discharged into the atmosphere.
[0023] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF DRAWINGS
[0024] 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.
[0025] 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.
[0026] FIGs. 1A and 1B illustrate exemplary views of the proposed mixer assembly, in accordance with an embodiment of the present disclosure.
[0027] FIGs. 1C and 1D illustrate exemplary views of the proposed mixer assembly of FIGs. 1A and 1B being disposed off within a cylindrical housing.
[0028] FIG. 1E illustrates an exemplary internal side view of the proposed mixer assembly depicting the configuration of the cone shaped portion within the mixer assembly.
[0029] FIGs. 2A to 2D illustrates step-by-step assembling of the proposed mixer assembly, in accordance with an embodiment of the present disclosure.
[0030] FIGs. 3A to 3F illustrates flow of exhaust gas and ETF through the proposed mixer assembly, in accordance with an embodiment of the present disclosure

DETAILED DESCRIPTION
[0031] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. 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.
[0032] 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.
[0033] Embodiments of the present disclosure relate to a compact and efficient mixer assembly with improved mixing performance and reduced backpressure for an exhaust treatment system of a vehicle and/or a diesel power generator, which efficiently mixes a diesel exhaust fluid (DEF) with exhaust gas and uniformly distributes the ETF/DEF mixed exhaust over a selective catalytic reduction (SCR) substrate.
[0034] According to an aspect, the present disclosure elaborates upon a mixer assembly for an exhaust treatment system. The mixer assembly can include a swirl mixer comprising a set of first blades with a first opening configured circumferentially over the swirl mixer. An injector can be fluidically coupled to the swirl mixer for injecting an exhaust treating fluid into the swirl mixer The mixer assembly can further include a first baffle including a set of first louvers configured at the first side of the swirl mixer, a blocking baffle including a central opening configured on a second side. opposite to the first side, of the swirl mixer, a set of second blades configured over the blocking baffle and extending outward from the central opening.
[0035] In an embodiment, a second baffle including a set of second louvers can be configured on the second side of the swirl mixer such that the set of second blades are in between the blocking baffle and the second baffle, and a second opening is formed between the two adjacent second blades.
[0036] In an embodiment, a central portion of the second baffle can include a set of perforations in line with the central opening of the blocking baffle.
[0037] In an embodiment, the swirl mixer can be a cylindrical shell having the set of first blades inclined at a first angle and extending outward from an outer surface of the cylindrical shell, and oriented parallel to a longitudinal axis of the swirl mixer, and wherein the corresponding first openings are configured on the cylindrical shell, beneath the set of first blades.
[0038] In an embodiment, the set of first louvers can be oriented perpendicular to a longitudinal axis of the first baffle such that each of the first louvers is configured radially over the surface of the first baffle with a second angle between the two adjacent first louvers.
[0039] In an embodiment, the set of second louvers can be oriented perpendicular to a longitudinal axis of the second baffle such that each of the second louvers is configured radially over the surface of the second baffle with a third angle between the two adjacent second louvers.
[0040] In an embodiment, the set of second blades can have a curved profile such that a concave surface of one of the second blades faces a convex surface of the adjacent second blade.
[0041] In an embodiment, the mixing assembly can be co-axially disposed within a cylindrical housing having an internal diameter equal to an external diameter of the blocking baffle. The swirl mixer can have an integral cone shaped portion at least partially extending out towards the cylindrical housing of the mixer assembly, and a mounting support arranged on the cylindrical housing to fix an injector that can be fluidically coupled to the swirl mixer for injection of an exhaust treating fluid (ETF) into the cone shaped portion of the swirl mixer. Further, when an exhaust gas enters into the mixer assembly through any or a combination of the first openings of the swirl mixer, the set of first louvers, and the cone shaped portion, a swirl of the exhaust gas can be created within the swirl mixer, which correspondingly facilitates mixing and/or vaporization of the injected ETF and the exhaust gas
[0042] In an embodiment, the exhaust gas mixed ETF can exit the mixer assembly through any or a combination of the second openings associated with the second set of blades, the set of perforations, and the set of second louvers, which can further create a swirl of the exhaust gas mixed ETF and facilitates uniform distribution of the exhaust gas mixed ETF over a selective catalyst reduction (SCR) substrate associated with the exhaust treatment system.
[0043] In an embodiment, the mixer assembly can be adapted to be configured with the exhaust treatment system associated with a vehicle, and/or a diesel-powered electrical generator, and wherein the ETF can be a diesel exhaust fluid (DEF).
[0044] Referring to FIGs. 1A to 1E, the proposed mixer assembly 100 (also referred to as assembly 100 or mixer 100, herein) can include a swirl mixer 102 having a set of first blades 102-1 (also referred to as first blades 102-1 or first vanes 102-1, herein) with a first opening 102-2 configured circumferentially over the swirl mixer 102. The swirl mixer 102 can be a cylindrical shell having the first blades 102-1 inclined at a first angle and extending outward from an outer surface of the cylindrical shell. The first angle can be an acute angle. The first blades 102-1 can be arranged or oriented parallel to a longitudinal axis of the swirl mixer 102, and the corresponding first openings 102-2 can be configured beneath the first blades 102-1. The mixer assembly 100 can further include an integral cone shaped portion 104. The open base of the cone shaped portion 104 can be connected to the cylindrical shell and the narrow top of the cone shaped portion 104-1 can extend at least partially outside the mixer assembly 100 to allow spraying of ETF within the swirl mixer 102. The cone shaped portion 104 can allow spraying of the ETF within the swirl mixer 102 when a stream of exhaust gas flows through the swirl mixer 102, thereby allowing mixing and/or vaporization of the ETF within the swirl mixer 102. In an exemplary embodiment, the ETF can be a diesel exhaust fluid (DEF) or reducing reagents such as urea or urea water solution, and a pollutant neutralizing fluid specific to certain pollutants to be neutralized, but not limited to the likes.
[0045] In an embodiment, the mixer assembly 100 can include a first baffle 106 including a set of first louvers 106-1 (also referred to as first louvers 106-1, herein), and a second baffle 108 including a set of second louvers 108-1 (also referred to as first louvers 108-1, herein) configured at a first side and a second side, respectively of the swirl mixer 102. The first louvers 106-1 can be oriented perpendicular to a longitudinal axis A-A’ of the first baffle 106 such that each of the first louvers is configured radially over the surface of the first baffle 106 with a second angle between two adjacent first louvers. The second angle can be acute. Similarly, the second louvers can also be oriented perpendicular to the longitudinal axis A-A’ such that each of the second louvers 108-1 is configured radially over the surface of the second baffle 108 with a third angle between two adjacent second louvers 108-1. The third angle can be acute. In an exemplary embodiment, four number of first louvers 106s can be configured on the first baffle 106, which can be oriented perpendicular to the longitudinal axis A-A’ and separated by the second angle of 900, but not limited to the likes. Further, the second baffle 108 can also have the four number of second louvers 108s being separated by the third angle of 900.
[0046] Referring to FIG. 1E, in an embodiment, the injector (not shown) can be arranged on the cylindrical housing 114 and above or over the cone shaped portion 104 of the mixer assembly 100 for injecting an ETF or DEF into a swirl mixer 102. Particularly, mounting support 104-1 can be arranged on the cylindrical housing 114 to fix the injector. This arrangement allows a gap in between the cone shaped portion 104 and the mounting support 104-1.
[0047] A portion of the exhaust gas can enter into the mixer assembly 100 through the first openings 102-2 of the swirl mixer 102 as shown in FIG. 3A and can create the swirl whose axis is parallel to the SCR substrate axis, and the second portion of the exhaust gas can enter into the mixer assembly 100 through the first louvers 106-1 as shown in FIG. 3B, generating a swirl near the first baffle 106 keeping away the ETF/DEF particles impinging on the first baffle 106. The third (remaining) portion of the exhaust enters through the cone shaped member 104 into the swirl mixer 102. Further, the ETF/DEF particles can be carried by this swirl and breakup into smaller particles and then vaporizes as shown in FIG. 3C.
[0048] In an embodiment, the mixer assembly 100 can include a blocking baffle 110 comprising a central opening 110-1 configured on the second side of the swirl mixer 102. The mixer assembly 100 can further include a set of second blades 112 (also referred to as second blades, herein) configured over the blocking baffle 110 and extending outward from the central opening 110-1. Further, the second baffle 108 comprising the second louvers 108-1 can be configured on the second side of the swirl mixer 102 such that the second blades are in between the blocking baffle 110 and the second baffle 108, and a second opening or gap is formed between the two adjacent second blades 112. A central portion of the second baffle 108 can include a set of perforations 108-2 in line with the central opening 110-1 of the blocking baffle 110. Further, once the second baffle 108 is positioned over the second blades 112 and blocking baffle 110, the gaps or second openings created between adjacent second blades 112 can act as an outlet that can allow the exhaust gas and/or the ETF, or a combination thereof, to flow out from the swirl mixer 102 through the central opening 110-1.
[0049] In an exemplary embodiment, the second blade 112 can have a curved profile such that a concave surface of one of the second blades faces a convex surface of the adjacent second blade. A first end of the curved second blade 112 can be at the circumference of the central opening 110-1 of the blocking baffle 110, and a second end of the curved second blade 112 can extend radially outward such that the second ends of all the second blades are oriented in the same clockwise or anti-clockwise direction, and the corresponding second openings are created between two adjacent curved second blades 112.
[0050] The swirl of the ETF mixed exhaust gas which was created at the first side of the swirl mixer 102 can go to the second side of the mixer assembly 100 through the second openings 110-1 associated with the second blades 112 as shown in FIG. 3D. The second blades 112 as well as the second louvers 108-1 of the second baffle 108, can further create a swirl that can further vaporize the particles of the ETF and also facilitate uniform spreading of the exhaust gas mixed ETF over a selective catalyst reduction (SCR) substrate associated with the exhaust treatment system as shown in FIG. 3E. Furthermore, the perforations 108-2 provided at the central portion of the second baffle 108 can prevent the creation of catalyst cold spots at the center of the swirl within the mixer assembly 100.
[0051] It is to be appreciated by a person skilled in the art that the creation of the swirl at the first side as well as at the second side of the mixer assembly 100 helps the DEF particles (or ETF) to have a longer path for the breakup and mixing, thereby efficiently mixing the DEF with the exhaust gas and uniformly distributes the EFT/DEF mixed exhaust (NH3 rich exhaust gas) over the SCR substrate. In addition, the perforations 108-2 at the central portion of the second baffle 108 also prevent the creation of catalyst cold spots within the mixer assembly.
[0052] As illustrated in FIG. 1C and 1D, in an embodiment, the mixing assembly 100 can be co-axially disposed within a cylindrical housing 114 having an internal diameter equal to an external diameter of the blocking baffle 110. Further, at least a portion 104-1 of the mounting support 104-1 can extend out of the cylindrical housing 114 to allow fluidic coupling of the injector and enable spraying of the ETF within the swirl mixer 102. A first side of the cylindrical housing 114 can extend at least partially beyond the first side of the swirl mixer 102, and the second side of the cylindrical housing 114 can extend at least partially beyond the second side of the swirl mixer 102. Further, cone shaped portion 104-1 can extend out of the mixer assembly 100 through the curved portion of the cylindrical housing 114. Accordingly, the complete mixer assembly 100 can be removably configured with conduits of an exhaust of vehicles or diesel generators or industrial plants and the likes.
[0053] In another aspect, the proposed mixer assembly 100 can also be configured with other exhaust treatment systems, where the injector can inject an exhaust treating fluid or pollutant neutralizing fluid specific to certain pollutants to be neutralized, in the swirl mixer 102, and can allow the swirl mixer 102 to create the swirl and uniformly mix the fluid with the stream of exhaust gas. This can allow the fluid to efficiently interact with the exhaust gas for a sufficient time and neutralize the specific pollutants before being discharged into the atmosphere.
[0054] Referring to FIGs. 2A to 2D, the step-by-step assembling of the proposed mixer assembly is disclosed. The mixer assembly can have the mounting support 104-1 disposed coaxially within the cylindrical housing 114 such that at least a portion of the mounting support 104-1 extends out from the curved surface of the cylindrical housing as shown in FIG. 2A. Further, the first baffle 106 having the first louvers 106-1 can be configured at the first side of the mixer assembly 100 as shown in FIG. 2B, and the blocking baffle 110 can be configured at the second side of the mixer assembly 100 as shown in FIG. 2C. Furthermore, the second (curved) blades 112 can be configured over the blocking baffle such that the first end of the curved second blade 112 can be at the circumference of the central opening 110-1 of the blocking baffle 110, and a second end of the curved second blade 112 can extend radially outward such that the second ends of all the second blades 112 are oriented in the same clockwise or anti-clockwise direction as shown in FIG, 2D. Finally, the second baffle 108 can be configured over the second blades 112 such that second blades 112 remain between the blocking baffle 110 and the second baffle 108 with the second openings created between two adjacent curved second blades 112 as shown in FIG.2D.
[0055] 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.
[0056] 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.

ADVANTAGES OF THE INVENTION
[0057] The proposed invention uniformly mixes an exhaust treating fluid or pollutant neutralizing fluid with exhaust gas.
[0058] The proposed invention reduces backpressure and deposition of fluids in a mixer assembly of an exhaust treatment system.
[0059] The proposed invention provides a mixer assembly for an exhaust treatment system, which uniformly mixes an exhaust treating fluid or pollutant neutralizing fluid such as diesel exhaust fluid (DEF) with exhaust gas.
[0060] The proposed invention provides a compact and efficient mixer assembly with improved performance and reduced backpressure for an exhaust treatment system of a vehicle and/or a diesel generator.
[0061] The proposed invention provides a compact and improved mixer assembly for an exhaust treatment system of a vehicle and/or a diesel generator, which efficiently mixes a diesel exhaust fluid (DEF) with exhaust gas and uniformly distributes the ETF/DEF mixed exhaust (NH3 rich exhaust gas) over a selective catalytic reduction (SCR) substrate.
[0062] The proposed invention prevents the creation of catalyst cold spots within a mixer assembly of an exhaust treatment system.
[0063] The proposed mixer at least partially prevents the formation of solid deposits of DEF fluid.