Systems and methods for supplying reducing agents in the aftertreatment system of an internal combustion engine

Abstract

Metering lance arrangement (200) for an exhaust gas component (206), wherein the metering lance arrangement (200) comprises: a housing (202), comprising: a plate (210) with a first channel (214); an end cap (222) with a second channel (229); and a tube (220) with a first end coupled to the plate (210), and a second end that is coupled to the end cap (222); and a supply line (226), comprising: a first end (230) that is coupled to the plate (210); a second end (232) coupled to the end cap (222) so that reducing agent can flow from the first channel (214) to the second channel (229); and a central section (234) which adjoins the first end (230) of the feed line (226) and the second end (232) of the feed line (226) and a has a screw shape; wherein a length of the supply line (226) along the supply line (226), measured between a point where the first end (230) of the supply line (226) is coupled to the plate (210) and a point where the second end (232) of the supply line (226) is coupled to the end cap (222) of the supply line (226), is greater than a first distance between a point where the first end of the tube (220) is coupled to the plate (210) and a point where the second end of the tube (220) is coupled to the end cap (222) when the housing (202) is at ambient temperature.

Claims

[1] Dosing lance arrangement (200) for an exhaust gas component (206), the dosing lance arrangement (200) comprising: a housing (202) comprising: a plate (210) having a first channel (214); an end cap (222) having a second channel (229); and a tube (220) having a first end coupled to the plate (210), and a second end coupled to the end cap (222); and a supply line (226) comprising: a first end (230) coupled to the plate (210); a second end (232) coupled to the end cap (222) so that reducing agent can flow from the first channel (214) to the second channel (229); and a central portion (234) adjacent to the first end (230) of the supply line (226) and the second end (232) of the supply line (226) and a has a screw shape; wherein a length of the supply line (226) along the supply line (226), measured between a location at which the first end (230) of the supply line (226) is coupled to the plate (210) and a location at which the second end (232) of the supply line (226) is coupled to the end cap (222) of the supply line (226), is greater than a first distance between a location at which the first end of the tube (220) is coupled to the plate (210) and a location at which the second end of the tube (220) is coupled to the end cap (222) when the housing (202) is at an ambient temperature. [2] Dosing lance arrangement (200) according to claim 1, wherein at least a part of a line center axis (B) of the supply line (226) is offset from a channel center axis (A) of the first channel (214). [3] Dosing lance assembly (200) according to claim 1, wherein the supply line (226) is substantially rigid. [4] Dosing lance assembly (200) according to claim 1, wherein the supply line (226) is metallic. [5] Dosing lance arrangement (200) according to one of claims 1 to 3, wherein the supply line (226) is made of solid metal. [6] Dosing lance arrangement (200) according to one of claims 1 to 3, wherein the supply line (226) is made of steel. [7] Dosing lance assembly (200) according to any one of the preceding claims, wherein the supply line (226) is a one-piece construction. [8] Dosing lance assembly (200) according to claim 1, wherein: the central portion (234) is centered on a conduit center axis (B); the first channel (214) is centered on a channel center axis (A); a first position on the conduit center axis (B) is a second distance from a second position on the channel center axis (A) when the housing (202) is at ambient temperature; and the first position on the conduit center axis (B) has a third distance from the second position on the channel center axis (A) when the housing (202) has temperatures higher than the ambient temperature; and the third distance is smaller than the second distance. [9] Dosing lance assembly (200) according to claim 1, wherein: the central portion (234) is defined by a bending radius; the supply line (226) is defined by an outer diameter (d0); and the bending radius is approximately one and a half times the outer diameter (d0) when the housing (202) is at ambient temperature. [10] Dosing lance arrangement (200) according to one of the preceding claims, wherein the tube (220) is made of a ferritic steel and the supply line (226) is made of an austenitic steel. [11] Dosing lance assembly (200) according to claim 1, wherein: the plate (210) is constructed to introduce air into the tube (220) so that the air is provided around the central section (234) and the central section (234) is cooled by the air. [12] Dosing lance assembly (200) according to claim 1, wherein: the housing (202) is defined by a thermal expansion coefficient; the housing (202) is constructed to reach a maximum temperature when exhaust gases are provided by the exhaust component (206), the maximum temperature being greater than the ambient temperature; and the length of the middle part is determined by a function of the thermal expansion coefficient, the maximum temperature and the first distance. [13] Dosing lance assembly (200) according to claim 1, wherein: the central portion (234) is centered on a conduit center axis (B); the first channel (214) is centered on a channel center axis (A); and the line center axis (B) is arranged to be rotatable around the channel center axis (A). [14] Dosing lance arrangement (200) according to one of the preceding claims, wherein: the first channel (214) is centered on a channel center axis (A); the central portion (234) has a second distance measured along the channel center axis (A) between the point at which the first end (230) of the supply line (226) is coupled to the plate (210) and the point at which the second end (232) of the supply line (226) is coupled to the end cap (222), when the housing (202) is at ambient temperature; and the central portion (234) has a third distance measured along the channel center axis (A) between the location at which the first end (230) of the supply line (226) is coupled to the plate (210) and the location at which the second end (232) of the supply line (226) is coupled to the end cap (222) when the housing (202) is at a temperature greater than the ambient temperature. [15] Dosing lance assembly (200) according to claim 14, wherein: the central portion (234) is defined by a bending radius; the supply line (226) is defined by an outer diameter (d0); and the bending radius is larger than the outer diameter (d0) when the housing (202) is at ambient temperature. [16] Dosing lance assembly (200) according to claim 14, wherein at least a portion of the central portion (234) is disposed along a conduit center axis (B) separate from the channel center axis (A). [17] Dosing lance assembly (200) according to claim 16, wherein: the central portion (234) has a plurality of bends; a first position on the conduit center axis (B) is a fourth distance from a second position on the conduit center axis (B) when the housing (202) is at ambient temperature; and the first position on the conduit center axis (B) is a fifth distance from the second position on the conduit center axis (B) when the housing (202) has temperatures higher than the ambient temperature; the fifth distance is smaller than the fourth distance; and the first position is located at at least one bend of the plurality of bends. [18] Dosing lance assembly (200) according to claim 16, wherein: the screw shape has a single helix; a first position on the conduit center axis (B) is a fourth distance from a second position on the conduit center axis (B) when the housing (202) is at ambient temperature; and the first position on the conduit center axis (B) is a fifth distance from the second position on the conduit center axis (B) when the housing (202) has temperatures higher than the ambient temperature; the fifth distance is smaller than the fourth distance; and the first position is in the individual helix. [19] Dosing lance assembly (200) according to claim 14, wherein: the central portion (234) is centered on a conduit center axis (B); and the pipe center axis (B) is offset from the channel center axis (A). [20] Dosing lance assembly (200) according to claim 14, wherein: the central portion (234) is defined by a bending radius; the supply line (226) is defined by an outer diameter (d0); and the bending radius is larger than the outer diameter (d0) when the housing (202) is at ambient temperature. [21] Dosing lance assembly (200) according to claim 1, wherein the helical shape includes a first helix and a second helix. [22] Dosing lance assembly (200) according to claim 1, wherein: the tube (220) is at least partially flow profile-shaped; the plate (210) comprises a projection (1302); the first end of the tube (220) receives the projection (1302); and the projection (1302) is at least partially flow profile-shaped.

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