Patent Publication Number: US-2023141549-A1

Title: Water drainage assemblies for aftertreatment systems

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application is a divisional of U.S. patent application Ser. No. 16/922,437, filed Jul. 7, 2020, which claims the benefit of U.S. Provisional Application No. 62/876,292, filed Jul. 19, 2019. The disclosures of these applications are hereby incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates generally to water drainage assemblies for aftertreatment systems. 
     BACKGROUND 
     Aftertreatment systems are generally used to treat exhaust gas generated by internal combustion engines such as diesel engines or gasoline engines. Aftertreatment systems may include various components, for example, a selective catalytic reduction (SCR) catalyst, oxidation catalysts, filters, mixers, baffles, etc. packaged inside a housing. Some aftertreatment systems or at least the tailpipes of the aftertreatment systems are oriented substantially vertically with respect to gravity. During rainy weather, for example, water can enter the tail pipe and flow into the aftertreatment system, which is detrimental to the performance of the aftertreatment system. 
     SUMMARY 
     Embodiments described herein relate generally to water drainage assemblies for inhibiting water (e.g., rainwater) from entering aftertreatment systems, and in particular, to water drainage assemblies that include a first tube and a larger diameter second tube disposed radially around the first tube. Water flows into the second tube around the first tube and is drained from the second tube via a drain port defined in the second tube. 
     In some embodiments, a water drainage assembly for an aftertreatment system comprises: a first tube structured to be coupled to an outlet conduit of the aftertreatment system, the first tube having a first cross-sectional width; a second tube disposed radially around the first tube, a first end of the second tube coupled to a radially outer surface of the first tube, a portion of the second tube having a second cross-sectional width that is larger than the first cross-sectional width such that a volume is defined between the first tube and the second tube; and a drain port defined in the second tube proximate to the first end of the second tube, wherein the water drainage assembly is structured such that water flowing into the water drainage assembly flows into the volume defined between the first tube and the second tube and is expelled therefrom via the drain port. 
     In some embodiments, a water drainage assembly for an aftertreatment system, comprises: a tube coupled to an outlet conduit of the aftertreatment system; and a pipe cover coupled to an outlet of the tube, the pipe cover comprising: a substantially conical main body configured to inhibit water from entering the tube, and a plurality of arms extending from the substantially conical main body inwardly towards the tube, the plurality of arms coupled to the tube such that gaps are defined between adjacent arms of the plurality of arms to allow exhaust gas to flow therethrough. 
     In some embodiments, a water drainage assembly for an aftertreatment system, comprises: a first tube fluidly coupled to the aftertreatment system, the aftertreatment system being oriented vertically with respect to gravity and the first tube being oriented substantially perpendicular with respect to a longitudinal axis of the aftertreatment system; and a second tube fluidly coupled to the first tube, the second tube being oriented substantially parallel to the longitudinal axis of the aftertreatment system, the second tube having a first end and a second end that is that is located at a lower elevation than the first end, the second tube being open at each of the first end and the second end such that water entering the second tube via the first end exits the second tube through the second end while being inhibited from entering the first tube. 
     It should be appreciated that all combinations of the foregoing concepts and additional concepts discussed in greater detail below (provided such concepts are not mutually inconsistent) are contemplated as being part of the subject matter disclosed herein. In particular, all combinations of claimed subject matter appearing at the end of this disclosure are contemplated as being part of the subject matter disclosed herein. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The foregoing and other features of the present disclosure will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. Understanding that these drawings depict only several implementations in accordance with the disclosure and are therefore not to be considered limiting of its scope, the disclosure will be described with additional specificity and detail through use of the accompanying drawings. 
         FIG.  1    is a side perspective view of a portion of an aftertreatment system having a water drainage assembly coupled thereto, according to an embodiment. 
         FIG.  2    is a side perspective view of the water drainage assembly of  FIG.  1   . 
         FIG.  3    is a cross-section view of the water drainage assembly of  FIG.  2    taken along the line A-A in  FIG.  2   . 
         FIG.  4    is a side cross-section view of the aftertreatment system of  FIG.  1    and the water drainage assembly being inclined at an inclination angle α with respect to gravity and water falling in a direction that is parallel to the direction of gravity. 
         FIG.  5    is a side cross-section view of the aftertreatment system of  FIG.  1   , with the aftertreatment system and the water drainage assembly being inclined at an angle α with respect to gravity, but with water falling at a non-zero angle with respect to gravity. 
         FIG.  6    is a side cross-section view of a portion of the water drainage assembly of  FIG.  4    indicated by the arrow A in  FIG.  4   . 
         FIG.  7    is a side perspective view of the aftertreatment system of  FIG.  1   , with the aftertreatment system being oriented substantially vertically with respect to gravity, and the water drainage assembly being also oriented vertically with respect to gravity, according to an embodiment. 
         FIG.  8    is a side perspective view of the aftertreatment system of  FIG.  1   , with the aftertreatment system oriented substantially horizontally with respect to gravity, and the water drainage assembly oriented substantially vertically with respect to gravity, according to an embodiment. 
         FIG.  9    is a side perspective view of an aftertreatment system that is oriented substantially horizontally with respect to gravity, and including an inlet and outlet conduits that are coupled to a sidewall of the aftertreatment system and oriented vertically with respect to gravity, the water drainage assembly of  FIG.  1    being coupled to the outlet conduit and is also oriented substantially vertically with respect to gravity, according to an embodiment. 
         FIG.  10    is a front perspective view of the aftertreatment system of  FIG.  9    positioned such that the inlet and outlet conduits are also oriented substantially horizontally with respect to gravity, and the water drainage assembly is oriented vertically with respect to gravity. 
         FIG.  11    is a side cross-section view of a water drainage assembly including a first baffle and a second baffle, according to an embodiment. 
         FIG.  12    is another side cross-section view of the water drainage assembly of  FIG.  11    showing the water drainage assembly being coupled to an outlet conduit of an aftertreatment system. 
         FIG.  13    is a schematic illustration of a water drainage assembly including a plurality of baffles, according to an embodiment. 
         FIG.  14    is a schematic illustration of a water drainage assembly that includes a plurality of perforated plates disposed in a tube of the water drainage assembly, according to an embodiment. 
         FIG.  15    is a schematic illustration of a water drainage assembly that includes a valve disposed at an outlet end of a tube of the water drainage assembly, according to an embodiment. 
         FIG.  16    is a schematic illustration of a water drainage assembly that includes a flap disposed at an outlet end of a tube of the water drainage assembly, according to an embodiment. 
         FIG.  17    is a side perspective view of a pipe cover coupled to an outlet conduit of an aftertreatment system and structured to inhibit water from entering the outlet conduit, according to an embodiment. 
         FIG.  18    is a side cross-section view of the pipe cover of  FIG.  17    taken along the line B-B in  FIG.  17   . 
         FIG.  19    is a side perspective view of the pipe cover of  FIG.  17    coupled to an outlet conduit of the aftertreatment system that is inclined at an angle with respect to gravity, according to an embodiment. 
         FIG.  20    is a side cross-section view of a water drainage assembly for an aftertreatment system, according to an embodiment. 
         FIG.  21    is a side perspective view of a water drainage assembly coupled to an outlet conduit of an aftertreatment system that is oriented vertically with respect to gravity, according to an embodiment. 
         FIG.  22    is a side cross-section view of a water drainage assembly that includes a first tube coupled to an outlet conduit of an aftertreatment system, a second tube coupled to and disposed around the first tube, and a first flange coupled to a second end of the second tube that is distal from the first tube, according to an embodiment. 
         FIG.  23    is a side perspective view of the water drainage assembly of  FIG.  22   . 
         FIG.  24    is a schematic illustration of a water drainage assembly that includes a plurality of baffle plates having slots defined therein, according to an embodiment. 
         FIG.  25    is a schematic illustration of a water drainage assembly that includes a rotating blade configured, according to an embodiment. 
         FIG.  26    is a side perspective view of a water drainage assembly that includes a helical ramp disposed within a tube, according to an embodiment. 
     
    
    
     Reference is made to the accompanying drawings throughout the following detailed description. In the drawings, similar symbols typically identify similar components, unless context dictates otherwise. The illustrative implementations described in the detailed description, drawings, and claims are not meant to be limiting. Other implementations may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here. It will be readily understood that the aspects of the present disclosure, as generally described herein, and illustrated in the figures, can be arranged, substituted, combined, and designed in a wide variety of different configurations, all of which are explicitly contemplated and made part of this disclosure. 
     DETAILED DESCRIPTION 
     Embodiments described herein relate generally to water drainage assemblies for inhibiting water (e.g., rainwater) from entering aftertreatment systems, and in particular, to water drainage assemblies that include a first tube and a larger diameter second tube disposed radially around the first tube. Water flows into the second tube around the first tube and is drained from the second tube via a drain port defined in the second tube. 
     Embodiments of the water drainage assemblies described herein may provide one or more benefits including, for example: (1) inhibiting water (e.g., rainwater) from flowing into the aftertreatment system; (2) collecting and draining water via a drain port so as to inhibit water from overflowing into the aftertreatment system; (3) providing the flexibility of mounting the water drainage assembly vertically with respect to gravity regardless of the orientation of the aftertreatment system; and (4) providing flexibility in mounting the water drainage assembly to allow fitment into available space. 
     Referring to  FIGS.  1 - 3   , an aftertreatment system  10  having a water drainage assembly  100  coupled thereto is shown, according to an embodiment. The aftertreatment system  10  includes a housing  11  defining an internal volume within which components of the aftertreatment system  10  are disposed. The aftertreatment system  10  is configured to treat an exhaust gas flowing therethrough. In some embodiments, the exhaust gas may include a diesel exhaust gas and the components may include a SCR system, an oxidation catalyst, filters (e.g., diesel particulate filters), mixers, baffle plates, etc. In the embodiment shown in  FIG.  1   , a longitudinal axis A L  of the aftertreatment system  10  is oriented vertically with respect to gravity. An outlet conduit  12  extends from a longitudinal end of the housing  11  and is configured to expel treated exhaust gas from the aftertreatment system  10 . 
     The water drainage assembly  100  is coupled to the outlet conduit  12  of the aftertreatment system  10 , and configured to inhibit water (e.g., rainwater) from entering the outlet conduit  12  and thereby the aftertreatment system  10 . The water drainage assembly  100  includes a first tube  110  coupled to the outlet conduit  12 . The first tube  110  has a first cross-sectional width, for example, a first diameter. A second tube  120  is disposed radially around the first tube  110 . A first end  121  of the second tube  120  that is located proximate to the outlet conduit  12  is coupled to a radially outer surface of the first tube  110 . At least a portion of the second tube  120  has a second cross-sectional width, for example, diameter, that is larger than the first cross-sectional width of the first tube  110 . For example, as shown in  FIGS.  1 - 3   , the second tube  120  is concentric with the first tube  110 , and has a larger diameter such that the second tube  120  surrounds the first tube  110 , and a volume  124  is defined therebetween. The second tube  120  is tapered at the first end  121  towards the first tube  110  and is coupled (e.g., welded) thereto. 
     A drain port  122 , for example, a circular opening, is defined in the second tube  120  proximate to the first end  121  of the second tube  120 . The drain port  122  may have a diameter in a range of 6 mm to 10 mm, inclusive. The second tube  120  is structured such that water flowing into the water drainage assembly  100  flows into the volume  124  between the second tube  120  and the first tube  110 , and is expelled from the volume  124  via the drain port  122 , and is thus inhibited from flowing into the aftertreatment system  10 . 
     In some embodiments, the water drainage assembly  100  also comprises a tail pipe  130  coupled to a second end  123  of the second tube  120  that is opposite the first end  121  of the second tube  120 . The tail pipe  130  may have a cross-sectional width, for example, diameter corresponding to the second cross-sectional width of the second tube  120 . The tail pipe  130  includes a tail pipe first portion  132  coupled to the second end  123  of the second tube  120  and axially aligned with the second tube  120 . The tail pipe  130  also includes a tail pipe second portion  134  extending at a non-zero angle from the tail pipe first portion  132 . In some embodiments, the angle may be about 90 degrees, i.e., the second tube  120  has a 90 degree bend. 
     An outlet  136  of the tail pipe  130  is slanted inwards towards the tail pipe first portion  132 . The slanted outlet  136  inhibits water (e.g., rainwater) from entering the tail pipe second portion  134  via the outlet  136  when the tail pipe second portion  134  is oriented horizontally with respect to gravity and water is falling vertically with respect to gravity. For example, referring to  FIGS.  4 - 6   , the aftertreatment system  10  may be inclined at an angle (e.g., an angle of about 30 degrees to 60 degrees) with respect to gravity changing the orientation of the slanted outlet  136  as shown in  FIG.  4   . In some instances, water may fall vertically with respect to gravity and flow into the tail pipe  130 , as shown in  FIG.  4   . In such instances, water flows along an inner surface of the tail pipe second portion  134  and drops into the tail pipe first portion  132 . The water than flows along the inner surface of the tail pipe first portion  132  into the second tube  120  and is expelled from the water drainage assembly  100  through the drain port  122 . In other instances, water may fall at an angle towards the outlet  136  as shown in  FIG.  5   , for example, in a direction that is axially aligned with a longitudinal axis of the tail pipe first portion  132 . In such instances, water flows along the inner surface of the tail pipe first portion  132  into the second tube  120  and out of the drain port  122 . Regardless of the orientation of the water drainage assembly  100  or direction of water flow, exhaust gas can flow out of the outlet conduit  12 , and through the first tube  110  and the tail pipe  130  into the environment. 
       FIG.  6    shows a portion of the water drainage assembly  100  indicated by the arrow A in  FIG.  4   . A vertical height D of the second tube  120  measured from the drain port  122  to the second end  123  may be defined based on an angle of inclination a of the aftertreatment system 100 , and thereby the water drainage assembly  100  with respect to gravity. For example, in some embodiments, the angle of inclination may be in a range of 20-60 degrees (e.g., 20, 25, 30, 35, 40, 45, 50, 55, or 60 degrees, inclusive), and the height D may be in a range of 90 mm to 110 mm (e.g., 90, 95, 100, 105, or 110 mm, inclusive). 
     The water drainage assembly  100  is configured for modular assembly and can be mounted in a substantially vertical orientation with respect to gravity (e.g., oriented at an angle within +5 degrees with respect to the gravity vector) regardless of the orientation or configuration of the aftertreatment system  10 . For example,  FIG.  7    shows a side perspective view of the aftertreatment system  10  of  FIG.  1   . The longitudinal axis A L  of the aftertreatment system  10  is oriented vertically with respect to gravity (e.g., aligned at an angle of about 0 degrees with respect to the gravity vector), and includes an inlet conduit  13  and the outlet conduit  12 , each of which are axially aligned with the longitudinal axis A L . The first tube  110  of the water drainage assembly  100  is coupled to the outlet conduit  12  to mount the water drainage assembly  100  vertically with respect to gravity. 
       FIG.  8    shows the aftertreatment system  10  oriented horizontally with respect to gravity (e.g., oriented at an angle of about 90 degrees with respect to gravity). To mount the water drainage assembly  100  vertically with respect to gravity, a connecting tube  150  is used. The connecting tube  150  has a 90 degree bend. A first end of the connecting tube  150  is coupled to the outlet conduit  12 , and a second end of the connecting tube  150  is coupled to the first tube  110  such that the first tube  110  and the second tube  120  of the water drainage assembly  100  are oriented vertically with respect to gravity. 
       FIG.  9    shows a side-perspective view an aftertreatment system  20 , according to another embodiment. A longitudinal axis A L  of the aftertreatment system  20  is oriented horizontally with respect to gravity. The aftertreatment system  20  includes an inlet conduit  22  and an outlet conduit  22  that are coupled to a sidewall of the aftertreatment system  20  perpendicular to the longitudinal axis A L  of the aftertreatment system  10 , and are oriented vertically with respect to gravity. The water drainage assembly  100  is coupled to the outlet conduit  22  as described with respect to  FIG.  7    and is oriented vertically with respect to gravity. 
       FIG.  10    shows a front perspective view of the aftertreatment system  20 , oriented such that the longitudinal axis A L  thereof is oriented horizontally with respect to gravity, and the inlet and outlet conduits  21 ,  22  thereof are also oriented horizontally with respect to gravity. In such embodiments, the connecting tube  150  is used to mount the water drainage assembly  100  to the outlet conduit  22  vertically with respect to gravity, as described with respect to  FIG.  8   . 
     In some embodiments, a water drainage assembly may include one or more baffles to guide water (e.g., rainwater) entering the water drainage assembly towards a drain port thereof. Referring now to  FIGS.  11 - 12   , a water drainage assembly  200  is shown, according to an embodiment. The water drainage assembly  200  includes a tube  220  having an inlet  224  structured to be coupled to an outlet conduit  32  of an aftertreatment system  30  (e.g., the aftertreatment system  10 ). In some embodiments, the tube  220  may include the second tube  120 , disposed around the first tube  110 . In such embodiments, the tube  220  is coupled to the outlet conduit  32 . 
     A drain port  222  is defined proximate to an end of tube  220  that is coupled to the outlet conduit  32 . A first baffle  240  is disposed in the tube  220 , and a second baffle  250  is disposed in the tube  220  below the first baffle  240 . A first baffle first end  241  off the first baffle  240  is attached to an inner surface of the tube  220  at a first location such that the first baffle  240  is inclined at a first baffle first angle α (e.g., in a range or 20-40 degrees, inclusive) from the inner surface of the tube  220  downwards with respect to gravity. Furthermore, a second baffle second end  251  of the second baffle  250  is coupled to the inner surface of the tube  220  at a second location that is opposite to, and below the first location with respect to gravity. The second baffle  250  is inclined at second baffle second angle which may be substantially the same as the first baffle first angle α (e.g., in a range or 20-40 degrees, inclusive) from the inner surface upwards with respect to gravity towards the first baffle  240 . Each baffle  240  and  250  may have a semi-circular shape, and the inclination of baffles  240 ,  250  directs the exhaust gas towards an outlet  226  of the tube  220   
     As shown in  FIG.  11   , the first baffle  240  is structured to guide water entering the tube  220  towards the second baffle  250 , and the second baffle  250  is structured to guide the water towards the drain port  222 . In particular embodiments as shown in  FIG.  11   , the first baffle  240  includes a first baffle first portion  242  that is coupled to the tube  220  and inclined at the first baffle first angle α (e.g., in a range or 20-40 degrees, inclusive). A first baffle second portion  244  extends from first baffle first portion  242  at a first baffle second angle β larger than the first baffle first angle α (e.g., in a range of 30-60 degrees, inclusive) towards the second baffle  250 . The second baffle  250  comprises a second baffle first portion  252  that is coupled to the tube  220  and inclined at the second baffle first angle, and a second baffle second portion  254  extending from the second baffle first portion  252  at a second baffle second angle, larger than the second baffle first angle, for example, substantially the same as the first baffle second angle ( 3 , towards the first baffle  240 . The first baffle second portion  244  is structured to guide the water towards the second baffle  250 . The second baffle second portion  254  may serve as an overflow protector configured to inhibit water falling and collecting on the second baffle first portion  252  from overflowing over the second baffle  250 . An edge of the second baffle second portion  254  distal from the second baffle first portion  252  may extend underneath the first baffle second portion  244  to ensure that all the water flowing towards the second baffle  250 , from the first baffle second portion  244 , is captured by the second baffle  250 . Furthermore, the space between the first baffle  240  and the second baffle  250  allows the exhaust gas to flow therebetween towards the outlet  226  of the tube  220 . 
       FIG.  13    is a side perspective view of a water drainage assembly  300 , according to another embodiment. The water drainage assembly  300  includes a tube  320  configured to be coupled to an outlet conduit  42  of an aftertreatment system  40 . A first baffle  340   a  is coupled to an inner surface of the tube  320  at a first location, and inclined upwards from the inner surface of the tube  320  with respect to gravity. A second baffle  340   b  is coupled to the inner surface of the tube  320  at a second location that is opposite to and below the first location. The second baffle  340   b  is inclined upwards from the inner surface towards the first baffle  340   a . A third baffle  340   c  that may be substantially similar to the first baffle  340   a , is coupled to the inner surface of the tube  320  at a third location that is below the second location but on the same side as the first location, and inclined upwards towards the second baffle  340   b . Similarly, a fourth baffle  340   d , that may be substantially similar to the second baffle  340   b , is coupled to the inner surface of the tube  320  at a fourth location that is below the third location but on the same side as the second location, and inclined upwards towards the third baffle  340   c . Each baffle  340   a/b/c/d  may have a semi-circular shape. The baffles  340   a/b/c/d  serve as ramps to direct water towards the walls of tube  320  and eventually towards a drain port  322  defined at an end of the tube  320  proximate to the outlet conduit  42 , while directing the exhaust gas towards an outlet of the tube  320 . 
       FIG.  14    is an illustration of a water drainage assembly  400 , according to another embodiment. The water drainage assembly  400  includes a tube  420  that may be structured to be coupled to an outlet conduit of an aftertreatment system (e.g., the outlet conduit  12 ,  22 ,  32 ,  42  of the aftertreatment system  10 ,  20 ,  30 ,  40 ). A plurality of baffles  440  are disposed at various locations along a length of the tube  420 . Each of the plurality of baffles  440  is coupled to the inner surface of the tube  420  and is inclined at a downward angle α with respect to gravity. A plurality of pores  442  are defined through each of the plurality of baffles  440 . Each of the plurality of pores  442  may be flared. In some embodiments, the pores  442  of each successive baffle  440  may be misaligned or staggered with respect to pores of an adjacent baffle  440 . The pores  442  are structured to allow exhaust gas to flow therethrough and guide the flow of water towards a blocked portion of the baffle  440 . Water entering the tube  420  flows downward on the top most baffle  440  and drops through the pores  442  thereof towards the adjacent baffle  440  located below the top most baffle  440 , while flowing towards a wall of the tube  420 . As the water flows through subsequent baffles  440 , the water is guided towards the wall of the tube  420 , and eventually out of a drain port  422  defined in the tube  420 . Furthermore, the pores  442  allow the exhaust gas to flow therethrough towards an outlet of the tube  420 . 
       FIG.  15    is an illustration of a water drainage assembly  500 , according to another embodiment. The water drainage assembly  500  includes a tube  520  that may be structured to be coupled to an outlet conduit of an aftertreatment system (e.g., the outlet conduit  12 ,  22 ,  32 ,  42  of the aftertreatment system  10 ,  20 ,  30 ,  40 ). A valve  540  is disposed at, or proximate to an outlet  526  of the tube  520 . In some embodiments, the valve  540  may include a butterfly valve, a throttle valve, or a rotating plate mounted at the outlet  526 . The valve  540  may be biased in a closed position (e.g., via a biasing member such as a spring) so as to close the outlet  526  when exhaust gas is not flowing towards the outlet  526  (e.g., when an engine coupled to the aftertreatment system is turned off). In the closed position, the valve  540  inhibits water from entering the tube  520 . When exhaust gas is flowing through the tube  520 , the exhaust gas pressure causes the valve  540  to rotate and move into an open position to allow the exhaust gas to flow out of the tube  520 . In the open position, the valve  540  is oriented in an inclined position such that water falling on the valve  540  is guided by the surface of the valve  540  out of the tube  520 , or towards a wall of the tube  520  towards a drain port (not shown) defined in the tube  520 . 
       FIG.  16    is an illustration of a water drainage assembly  600 , according to another embodiment. The water drainage assembly  600  includes a tube  620  that may be structured to be coupled to an outlet conduit of an aftertreatment system (e.g., the outlet conduit  12 ,  22 ,  32 ,  42  of the aftertreatment system  10 ,  20 ,  30 ,  40 ). A flap  640  (e.g., a flat plate) is mounted horizontally at an outlet  626  of the tube  620  via standoffs  642 , such that a gap G is present between the flap  640  and the outlet  626 . The flap  640  inhibits water from entering the tube  620 , while allowing exhaust gas to flow through the gap G out of the outlet  626 . 
     In some embodiments, a water drainage assembly may include a pipe cover (e.g., a chimney cover) coupled to an outlet conduit of an aftertreatment system, or to a tube (e.g., the first tube  110  or the second tube  120 ) coupled to the outlet conduit, to inhibits water from entering the aftertreatment system. Referring now to  FIGS.  17 - 19   , a pipe cover  720  is shown coupled to a tube  710  that may be coupled to an outlet conduit  52  an aftertreatment system  50 . In some embodiments, the pipe cover  720  may be coupled directly to the outlet conduit  52  of the aftertreatment system  50  as shown in  FIG.  19   . 
     The pipe cover  720  includes a main body  721  configured to drive water away from the aftertreatment system  50 . The main body  721  has a triangular cross-section. In other words, the main body  721  is substantially conical. The term “substantially conical” encompasses a conical shape with a curved top rather than a pointed top. The pipe cover  720  is coupled to the tube  710  via a plurality of arms  722  (e.g., a pair of arms as shown in  FIGS.  17 - 19   ) that extend from the pipe cover  720  towards the tube  710  and is coupled thereto, such that a gap  712  is defined between adjacent arms of the plurality of arms  722  allowing the exhaust gas to flow out of the tube  710  through the gap  712 . Each of the plurality of arms  722  may define a curvature. Furthermore, the plurality of arms  722  may be positioned such that when the aftertreatment system  50  and thereby, the pipe cover  720  is inclined at an angle β with respect to gravity, at least one of the plurality of arm  722  faces the flow of water, and inhibits the water from entering the tube  710  and thereby, the aftertreatment system  50 , as shown in  FIG.  19   . 
       FIG.  20    is a side cross-section view of a water drainage assembly  800  for an aftertreatment system  60 , according to an embodiment. The water drainage assembly  800  includes a first tube  810  fluidly coupled to the aftertreatment system  60  that is oriented substantially perpendicular (e.g., in a range of 85 degrees to 95 degrees) with respect to a longitudinal axis A L  of the aftertreatment system  60 , the aftertreatment system  60  being vertically oriented with respect to gravity. A second tube  820  is fluidly coupled to first tube  810  and is oriented substantially parallel (e.g., in a range of −5 degrees to +5 degrees) of the longitudinal axis A L  of the aftertreatment system  60 . The second tube  820  is open at each of a first longitudinal end  826  and a second longitudinal end  828  that is located lower than the first longitudinal end  826  with respect to gravity. Exhaust gas flows from the aftertreatment system  60  through the first tube  810  into the second tube  820  and may exit the second tube  820  from any one of the first or second longitudinal end  826 ,  828 . Furthermore, water enters the second tube  820  from the first longitudinal end  826  and exits the second tube  820  through the second longitudinal end  828  without entering the first tube  810 . 
       FIG.  21    is a perspective view of another water drainage assembly  900  coupled to an aftertreatment system  70 , according to an embodiment. A longitudinal axis A L  of the aftertreatment system  70  is oriented vertically with respect to gravity. An outlet conduit  72  extends from a longitudinal end of the aftertreatment system  70 . The water drainage assembly  900  includes a first tube  910  and a second tube  920  as described with respect to the water drainage assembly  800 . A connecting tube  902  including a 90 degree bend is used to couple the outlet conduit  72  to the first tube  910  so as to orient the first tube  910  substantially perpendicular with respect to the longitudinal axis A L  of the aftertreatment system  70 . Different from the water drainage assembly  900 , the second tube  920  includes a bend such that a first portion  922  thereof is oriented substantially parallel to the longitudinal axis A L  of the aftertreatment system  70 , while a second portion  924  thereof, that is located downstream of the first portion  922  is oriented substantially perpendicular to the longitudinal axis A L . In some embodiments, the second portion  924  may be oriented downwards at angle μ (e.g., in a range of 2 degrees to 5 degrees, inclusive) to reduce the likelihood of water entering an exhaust gas outlet  926  defined at an end of the second portion  924 . A water outlet  928  is defined at an end of the first portion  922  that is distal from the second portion  924  and is configured to allow any water that enters the second tube  920  from exiting the second tube  920 . 
       FIGS.  22 - 23    show a water drainage assembly  1000  for an aftertreatment system  80 , according to another embodiment. The water drainage assembly  1000  includes a first tube  1010  coupled to an outlet conduit  82  of the aftertreatment system  80  (e.g., the aftertreatment system  10 ). A second tube  1020  is disposed circumferentially around the first tube  1010  and extends longitudinally away therefrom. A first end of the second tube  1020  is coupled to an outer surface of the first tube  1010 . A portion of the second tube  1020  has a second diameter or otherwise cross-sectional width that is larger than a first diameter or otherwise cross-sectional width of the first tube  1010 . 
     A first flange  1026  may be coupled to a second end of the second tube  1020  opposite the first end. The first flange  1026  defines a first flange outlet tube  1027  having a smaller cross-sectional width (e.g., diameter) than the second cross-sectional width (e.g., diameter). In some embodiments, a second flange  1012  ( FIG.  22   ) may also be disposed in the second tube  1020  proximate to the first tube  1010 . In some embodiments, the first tube  1010  may be excluded and the second flange  1012  may be coupled to an outlet of the aftertreatment system  80 . The second flange  1012  may define a second flange inlet tube  1014  extending into the second tube  1020 . In some embodiments, the second flange inlet tube  1014  may have a diameter corresponding to the diameter of the first flange outlet tube  1027 . 
     The water drainage assembly  1000  also includes a baffle plate  1030  disposed in the second tube  1020 . As shown in  FIG.  23   , the baffle plate  1030  includes a central portion  1032  having a cross-sectional width (e.g., diameter) equal to or larger than the cross-sectional width (e.g., diameter) of the first flange outlet tube  1027 . The second flange  1012  is excluded from  FIG.  23    for clarity. At least one arm extends from a periphery of the central portion  1032  and is attached to an inner surface of second tube  1020 . For example, as shown in  FIG.  23   , a pair of arms  1034   a/b  extend from opposite ends of the central portion  1032  and are coupled to the inner surface of the second tube  1020  (e.g., welded thereto). In some embodiments, walls  1036   a/b  may extend from lateral edges of the baffle plate  1030 . Water entering through the first flange outlet tube  1027  falls on the central portion  1032  that inhibits the water from entering the first tube  1010 . Water flows around the central portion  1032 , for example, guided by the walls  1036   a/b  towards the end of the arms  1034   a/b , into the second tube  1020  around the first tube  1010  and expelled therefrom via a drain port  1022  defined in the second tube  1020 . 
       FIG.  24    is a schematic illustration of a water drainage assembly  1100  for use with an aftertreatment system according to an embodiment. The water drainage assembly  1100  includes a tube  1120  structured to be coupled to an outlet conduit of the aftertreatment system (e.g., the outlet conduit  12 ,  22 ,  32 ,  42 ,  52 ,  62 ,  72 ,  82  of the aftertreatment system  10 ,  20 ,  30 ,  40 ,  50 ,  60 ,  70 ,  80 ). A first baffle  1130  is disposed in the tube  1120  and is inclined at a first angle downwards with respect to gravity. A first set of slots  1132  are defined through the first baffle  1130  at first baffle location that is located at a lower elevation with respect to gravity. A second baffle  1140  is disposed below the first baffle  1130  and is inclined at a second angle in an opposite direction to the downwards inclination of the first baffle  1130 . A second set of slots  1142  are also defined in the second baffle  1140  at a second baffle location that is distal from the first baffle location. While  FIG.  24    shows the first set and second set of slots  1132 ,  1142  as being longitudinal slots, in other embodiments, the slots  1132 ,  1142  may include circular, square, elliptical or any other shape throughholes. Water flowing into the tube  1120  flows down the first baffle  1130  towards the first set of slots  1132  onto the second baffle  1140 . Water then flows downs the second baffle  1140  towards the second set of slots  1142  and therethrough. The water may then be expelled from the tube  1120  via a drain port (not shown). 
       FIG.  25    is a schematic illustration of a water drainage assembly  1200  for use with an aftertreatment system, according to another embodiment. The water drainage assembly  1200  includes a tube  1220  configured to be coupled to an outlet conduit of the aftertreatment system (e.g., the outlet conduit  12 ,  22 ,  32 ,  42 ,  52 ,  62 ,  72 ,  82  of the aftertreatment system  10 ,  20 ,  30 ,  40 ,  50 ,  60 ,  70 ,  80 ). A blade  1230  is disposed within the tube  1220 , and configured to rotate. For example, a motor (not shown) may be operatively coupled to the blade  1230  and configured to selectively rotate the blade  1230 , for example, in situations when it is raining. In some embodiments, the blade  1230  may include a blade assembly having a pair of spinning blades (e.g., counter-rotating blades). The rotation of the blade  1230  propels any water entering the tube  1220  radially outwards via centrifugal force towards an inner surface of the tube  1220 . A ramp  1232 , for example, a circumferential ramp, is coupled to the inner surface of the tube  1220  and is inclined downwards to the inner surface of the tube  1220  towards a drain port  1222  defined through the tube  1220  to allow the water to be expelled from the tube  1220 . 
       FIG.  26    is a side perspective view of a water drainage assembly  1300 , according to still another embodiment. The water drainage assembly  1300  includes a tube  1320  configured to be coupled to an outlet conduit of the aftertreatment system (e.g., the outlet conduit  12 ,  22 ,  32 ,  42 ,  52 ,  62 ,  72 ,  82  of the aftertreatment system  10 ,  20 ,  30 ,  40 ,  50 ,  60 ,  70 ,  80 ). The water drainage assembly  1300  includes a helical ramp  1330  (the tube  1320  is shown as translucent to show the helical ramp  1330  disposed therein). A first end of the ramp  1330  is disposed proximate to an outlet  1326  of the tube  1320 , and a second end of the ramp  1330  opposite the first end is coupled to an inner surface of the ramp  1330  at a location where a drain port  1322  is defined through the tube  1320 . The ramp  1330  has a curved shape (e.g., a hemispherical shape) and is structured such that water entering the tube  1320  flows on the ramp  1330  towards the drain port  1322 , wherefrom the water is expelled from the tube  1320 . 
     It should be noted that the term “example” as used herein to describe various embodiments is intended to indicate that such embodiments are possible examples, representations, and/or illustrations of possible embodiments (and such term is not intended to connote that such embodiments are necessarily extraordinary or superlative examples) 
     As used herein, the terms “about” and “approximately” generally mean plus or minus 10% of the stated value. For example, about 0.5 would include 0.45 and 0.55, about 10 would include 9 to 11, about 1000 would include 900 to 1100. 
     As utilized herein, the terms “substantially′ and similar terms are intended to have a broad meaning in harmony with the common and accepted usage by those of ordinary skill in the art to which the subject matter of this disclosure pertains. It should be understood by those of skill in the art who review this disclosure that these terms are intended to allow a description of certain features described and claimed without restricting the scope of these features to the precise arrangements and/or numerical ranges provided. Accordingly, these terms should be interpreted as indicating that insubstantial or inconsequential modifications or alterations of the subject matter described and claimed are considered to be within the scope of the inventions as recited in the appended claims. 
     The terms “coupled,” and the like as used herein mean the joining of two members directly or indirectly to one another. Such joining may be stationary (e.g., permanent) or moveable (e.g., removable or releasable). Such joining may be achieved with the two members or the two members and any additional intermediate members being integrally formed as a single unitary body with one another or with the two members or the two members and any additional intermediate members being attached to one another. 
     It is important to note that the construction and arrangement of the various embodiments presented herein are illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described herein. Additionally, it should be understood that features from one embodiment disclosed herein may be combined with features of other embodiments disclosed herein as one of ordinary skill in the art would understand. Other substitutions, modifications, changes and omissions may also be made in the design, operating conditions and arrangement of the various exemplary embodiments without departing from the scope of the present invention. 
     While this specification contains many specific implementation details, these should not be construed as limitations on the scope of any inventions or of what may be claimed, but rather as descriptions of features specific to particular implementations of particular inventions. Certain features described in this specification in the context of separate implementations can also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.