Mixing device

Abstract

A mixing device for integration into an exhaust pipe of an internal combustion engine and for mixing an exhaust gas stream (T), which device is formed from a housing having a tubular wall and a mid-axis that can be aligned parallel to the exhaust pipe and from an intermediate wall which is aligned transversely with respect to the mid-axis, wherein the intermediate wall divides the housing and has an inflow side and an outflow side, wherein at least one inflow opening (E 1 ) is provided in the intermediate wall, via which the exhaust gas stream (T) can at least partly flow from the inflow side of the intermediate wall to the opposite outflow side of the intermediate wall, wherein the at least one inflow opening (E 1 ) is placed eccentrically with respect to the mid-axis and is brought close to a wall section (W 1 ) of the tubular wall, wherein a flow guide element (S 2 ) having a longitudinal axis (L 2 ) is provided on the outflow side, which at least partly bounds a mixing chamber with the intermediate wall and by an at least partial deflection of the exhaust gas stream (T) in a radial direction in relation to the mid-axis can be effected, wherein the flow guide element (S 2 ) has at least two outflow openings (A 1 , A 2 ) and, by the flow guide element (S 2 ), the exhaust gas stream (T) coming from the inflow opening (E 1 ) can be guided to the at least two outflow openings (A 1 , A 2 ), wherein the outflow openings (A 1 , A 2 ) are placed eccentrically with respect to the mid-axis and brought close to a common wall section (W 2 ) of the tubular wall, wherein the wall section (W 2 ) is arranged opposite to the wall section (W 1 ) with respect to the mid-axis, and wherein the outflow openings (A 1 , A 2 ) are arranged on opposite sides of the flow guide element (S 2 ) with respect to the longitudinal axis (L 1 , L 2 ), wherein, with respect to the mid-axis, the first partial stream (T 3 ) can be can at least partly guided in the anticlockwise direction and a second partial stream (T 4 ) can at least partly be guided in the clockwise direction out of the outflow openings (A 1 , A 2 ).

What is claimed is: 
     
         1 . A mixing device for integration into an exhaust pipe of a combustion engine and for mixing an exhaust gas stream T, comprising: a housing with a tubular wall and a mid-axis that can be aligned parallel to the exhaust pipe and from an intermediate wall which is aligned transversely to the mid-axis, wherein the intermediate wall divides the housing and features an inflow side and an outflow side, wherein at least one inflow opening E 1  is provided in the intermediate wall, through which the exhaust gas stream T can flow at least partially from the inflow side of the intermediate wall to an opposite outflow side of the intermediate wall, wherein the at least one inflow opening E 1  is positioned eccentrically with respect to the mid-axis and is brought close to a wall section W 1  of the tubular wall,
 wherein on the outflow side a flow guide element S 2  is provided with a longitudinal axis L 2 , which with the intermediate wall at least partly bounds a mixing chamber, and by means of which an at least partial deflection of the exhaust gas stream T can be effected from its original flow direction into a radial direction in relation to the mid-axis, wherein the flow guide element S 2  features at least two outflow openings A 1 , A 2 , and by means of the flow guide element S 2 , the exhaust gas flow T can be guided, starting from the inflow opening E 1 , to the at least two outflow openings A 1 , A 2 , wherein all outflow openings A 1 , A 2  are positioned eccentrically with respect to the mid-axis and are brought close to a wall section W 2  of the tubular wall, wherein the wall section W 2  is arranged opposite the wall section W 1  with respect to the mid-axis, and the outflow openings A 1 , A 2  are arranged on opposite sides of the flow guide element S 2  with respect to the longitudinal axis L 1 , L 2 , wherein with respect to the mid-axis, a first partial stream T 3  can be guided at least partially in the anticlockwise direction and a second partial stream T 4  can be guided at least partially in the clockwise direction out of the outflow openings A 1 , A 2 . 
 
     
     
         2 . The mixing device according to  claim 1 , wherein on the intermediate wall, a first flow guide element S 1  with a longitudinal axis L 1  is provided, which protrudes upstream in the axial direction over the intermediate wall and which with the intermediate wall at least partly bounds the mixing chamber, wherein two inflow openings E 1 , E 2  are provided in the intermediate wall, which are arranged opposite in relation to the longitudinal axis L 1 , wherein the flow guide element S 1  effects a division of the exhaust gas stream T into two partial streams T 1 , T 2 , wherein with respect to the mid-axis, a first partial stream T 1  can be guided in a clockwise direction and a second partial stream T 2  can be guided in an anticlockwise direction around the flow guide element S 1  into the respective inflow opening E 1 , E 2  and into the mixing chamber. 
     
     
         3 . The mixing device according to  claim 1 , wherein the flow guide elements S 1 , S 2  are designed as a single piece, and/or at least one flow guide element S 1 , S 2  is an integral part of the intermediate wall or the tubular wall. 
     
     
         4 . The mixing device according to  claim 1 , wherein the intermediate wall and the mid-axis enclose an angle α between 20° and 80°. 
     
     
         5 . The mixing device according to  claim 1 , wherein the intermediate wall has a single or multiple angled, contoured or curved form. 
     
     
         6 . The mixing device according to  claim 1 , wherein in the mixing chamber in an area before the outflow openings A 1 , A 2 , a corrugated base and/or a flow guide element is provided for the purpose of avoiding a steam bottleneck. 
     
     
         7 . The mixing device according to  claim 1 , wherein the intermediate wall is at least partially integrated into the housing or at is at least partially formed from the housing. 
     
     
         8 . A mixing device for connection to or integration into an exhaust pipe of a combustion engine and for mixing an exhaust gas flow T, comprising: a housing with a tubular wall and with a mid-axis that can be arranged parallel to the exhaust pipe and with a first intermediate wall Z 1  and with a second intermediate wall Z 2  which are aligned transversely to the mid-axis, wherein both intermediate walls Z 1 , Z 2  at least partly bound a mixing chamber, wherein the first intermediate wall Z 1  features at least one inflow opening E 1 , through which the exhaust gas stream T can enter the mixing chamber, wherein the inflow opening E 1  is positioned eccentrically with respect to the mid-axis and is brought close to a wall section W 1  of the tubular wall, and the second intermediate wall Z 2  features at least one outflow opening A 1 , through which the exhaust gas stream T can exit from the mixing chamber, wherein the outflow opening A 1  is positioned eccentrically with respect to the mid-axis and is brought close to a wall section W 2  of the tubular wall, wherein the wall section W 2  is arranged opposite the wall section W 1 , so that an at least partial deflection of the exhaust gas stream T can be effected at least partially in a radial direction with respect to the mid-axis, and in the flow direction after the first intermediate wall Z 1 , at least one flow guide element S 3  is provided in the mixing chamber, which protrudes in the radial direction over the tubular wall and effects a division of the exhaust gas stream T into two partial streams T 3 , T 4 , wherein with respect to the mid-axis, a first partial stream T 3  can be guided in an anticlockwise direction, and a second partial stream T 4  can be guided in a clockwise direction around the flow guide element S 3 . 
     
     
         9 . The mixing device according to  claim 8 , wherein a feed device with a feed nozzle is provided, through which an additive can be brought into the mixing chamber. 
     
     
         10 . The mixing device according to  claim 8 , wherein the inflow opening E 1  or the inflow openings E 1 , E 2  form an inflow profile QE and the housing features a profile surface QF that effects the stream, with 0.08 QF<=QE<=0.42 QF. 
     
     
         11 . The mixing device according to  claim 8 , wherein the outflow opening A 1  or the outflow openings A 1 , A 2  form an outflow profile QA and the housing features a profile surface QF that effects the stream, with 0.08 QF<=QA<=0.42 QF. 
     
     
         12 . The mixing device according to  claim 8 , wherein the inflow opening E 1  or the inflow openings E 1 , E 2  form an inflow profile QE and at least one further inflow opening Ex is provided in the flow guide element S 1  or in the intermediate wall Z 1 , through which a portion of the exhaust gas stream T can enter the mixing chamber, wherein the at least one inflow opening Ex forms an inflow profile Xe, with Xe<=0.1 QE. 
     
     
         13 . The mixing device according to  claim 8 , wherein the outflow opening A 1  or the outflow openings A 1 , A 2  form an outflow profile QA and at least one further outflow opening Ax is provided in the flow guide element S 2  or in the intermediate wall Z 2 , through which a portion of the exhaust gas stream T can enter the mixing chamber, wherein the at least one outflow opening Ax forms an outflow profile Xa, with Xa<=0.1 QA. 
     
     
         14 . The mixing device according to  claim 8 , wherein on at least one inflow opening Ex and/or on at least one outflow opening Ax, a flow blade is provided. 
     
     
         15 . The mixing device according to  claim 8 , wherein in the mixing chamber, at least one static mixer and/or at least one baffle plate is provided, wherein the baffle plate is arranged parallel to the longitudinal axis L 1 , L 2  of the flow guide element S 1 , S 2 . 
     
     
         16 . The mixing device according to  claim 2 , wherein the flow guide elements S 1 , S 2  are designed as a single piece, and/or at least one flow guide element S 1 , S 2  is an integral part of the intermediate wall or the tubular wall, and wherein the intermediate wall and the mid-axis enclose an angle α between 20° and 80°. 
     
     
         17 . The mixing device according to  claim 16 , wherein the intermediate wall has a single or multiple angled, contoured or curved form, wherein in the mixing chamber in an area before the outflow openings A 1 , A 2 , a corrugated base and/or a flow guide element is provided for the purpose of avoiding a steam bottleneck, and wherein the intermediate wall is at least partially integrated into the housing or at is at least partially formed from the housing. 
     
     
         18 . The mixing device according to  claim 9 , wherein the inflow opening E 1  or the inflow openings E 1 , E 2  form an inflow profile QE and the housing features a profile surface QF that effects the stream, with 0.08 QF<=QE<=0.42 QF, wherein the outflow opening A 1  or the outflow openings A 1 , A 2  form an outflow profile QA and the housing features a profile surface QF that effects the stream, with 0.08 QF<=QA<=0.42 QF, and wherein the inflow opening E 1  or the inflow openings E 1 , E 2  form an inflow profile QE and at least one further inflow opening Ex is provided in the flow guide element S 1  or in the intermediate wall Z 1 , through which a portion of the exhaust gas stream T can enter the mixing chamber, wherein the at least one inflow opening Ex forms an inflow profile Xe, with Xe<=0.1 QE. 
     
     
         19 . The mixing device according to  claim 18 , wherein the outflow opening A 1  or the outflow openings A 1 , A 2  form an outflow profile QA and at least one further outflow opening Ax is provided in the flow guide element S 2  or in the intermediate wall Z 2 , through which a portion of the exhaust gas stream T can enter the mixing chamber, wherein the at least one outflow opening Ax forms an outflow profile Xa, with Xa<=0.1 QA, wherein on at least one inflow opening Ex and/or on at least one outflow opening Ax, a flow blade is provided, and wherein in the mixing chamber, at least one static mixer and/or at least one baffle plate is provided, wherein the baffle plate is arranged parallel to the longitudinal axis L 1 , L 2  of the flow guide element S 1 , S 2 .