JP6423549B2 - Stirrer - Google Patents

Description

  The present disclosure relates to a stirring device that stirs a fluid passing through a flow path.

  It is known to arrange a mixer in a bent section on the upstream side of the SCR catalyst in the exhaust gas path. The mixer of Patent Document 1 has a plurality of stationary blades. A swirl flow is generated in the exhaust gas passing through the mixer by the plurality of stationary blades. Further, on the upstream side of the mixer, the reactant of the SCR catalyst is sprayed toward the exhaust gas path. Then, on the downstream side of the mixer, the exhaust gas and the reactant are mixed by the swirling flow.

Japanese Patent Laid-Open No. 2015-178831

  However, in Patent Document 1, a swirling flow is generated in the exhaust gas that has passed through the mixer. For this reason, unless the section on the downstream side of the mixer in the exhaust gas path is long to some extent, the exhaust gas and the reactant cannot be sufficiently mixed.

  In one aspect of the present disclosure, it is desirable to provide an agitation device that satisfactorily agitates a fluid.

  One aspect of the present disclosure relates to a stirring device that stirs a moving fluid that moves in a flow path. The stirring device includes an outer shell member and a stirring unit. The outer shell member is a joint-like member that connects the end of the upstream pipe, which is a tubular member located on the upstream side of the flow path, and the end of the downstream pipe, which is a tubular member located on the downstream side of the flow path. It is. The downstream pipe is a member that extends in a direction crossing the upstream pipe or in a direction parallel to the upstream pipe. It is a joint-like member that connects the end of the downstream pipe. The outer shell member is a member that covers the flow path. The stirrer stirs the moving fluid by moving the moving fluid toward a side different from the side where the outlet of the flow path is located by the facing member. The facing member is provided in the flow path in a state facing the course of the moving fluid that has passed through the inlet of the flow path.

  According to such a configuration, the moving fluid that has entered the flow path from the inlet moves to a side different from the side where the outlet of the flow path is located by the opposing member. That is, the moving fluid does not immediately go to the outlet of the flow path, but reaches the outlet after moving along the detour path. For this reason, the moving distance of the moving fluid in the flow path becomes long. Furthermore, a complicated turbulent flow is generated in the flow path due to the collision between the moving fluid and the opposing member and the flow of the moving fluid along the detour path. For this reason, the moving fluid is effectively stirred in the flow path. Therefore, even when the flow path is short, the fluid can be well stirred in the flow path.

In the present disclosure, the outer shell member may have a hole for allowing an additional fluid, which is a fluid different from the moving fluid, to enter the flow path.
According to such a configuration, the additional fluid is added to the moving fluid that moves along the detour path. For this reason, the mixing time of the moving fluid and the additional fluid becomes long. Moreover, since the complicated turbulent flow of the moving fluid is generated in the flow path, the additional fluid is effectively dispersed in the moving fluid. Therefore, the moving fluid and the additional fluid can be mixed well.

  In the present disclosure, the moving fluid is exhaust gas discharged from the engine of the vehicle, and the additional fluid may be fluid used for purification of exhaust gas by a purification device provided in the downstream pipe.

In this case, the exhaust gas and the additional fluid can be mixed well. Therefore, the purification effect of the exhaust gas by the purification device can be enhanced.
In the present disclosure, the flow path may have an agitation space connected to the inlet and a diffusion space connected to the outlet. Further, the facing member may have a connection port that partitions the stirring space and the diffusion space and connects the stirring space and the diffusion space. The stirring unit may stir the moving fluid in the stirring space, and the stirring device may further include a diffusion unit that diffuses the moving fluid moving in the diffusion space.

  According to such a configuration, the moving fluid reaches the diffusion space after being stirred in the stirring space. The moving fluid passes through the outlet after being diffused in the diffusion space. For this reason, it can accelerate | stimulate that a moving fluid passes an exit in a uniform state (in other words, the state which is not biased to a specific area | region). Accordingly, it is possible to promote the moving fluid reaching the purification device provided in the downstream pipe in a uniform state. As a result, the purification effect of the moving fluid by the purification device is improved.

  Moreover, by providing the stirring space and the diffusion space in the flow path, the moving distance of the moving fluid in the flow path becomes longer. For this reason, a moving fluid is stirred more effectively. Furthermore, when adding an additional fluid to a flow path, the mixing time of a moving fluid and an additional fluid becomes longer. For this reason, a moving fluid and an additional fluid can be mixed more effectively.

  In the present disclosure, the flow path may have a portion extending forward from the outlet. Further, the inlet may face the side portion of the portion. The diffusion space may have an entrance region and an exit region. The inlet region is a region extending toward the outlet, the side portion of which is located in front of the inlet and is surrounded by the stirring space. The exit region is a region that connects the entrance region and the exit, and is a region that spreads laterally from the end of the entrance region on the exit side. Further, the facing member may include a cylindrical portion that covers the side portion of the inlet region and is disposed in a state of facing the path of the moving fluid that has passed through the inlet. Further, the connection port may be provided on the side opposite to the side where the inlet of the cylindrical portion is located. Further, the stirring unit may stir the moving fluid by moving the moving fluid toward the inner wall of the outer shell member positioned in front of the inlet by the cylindrical portion. Further, the diffusion part may be a cylindrical part. In addition, the cylindrical portion may diffuse the moving fluid in the outlet region by circulating the moving fluid in a direction intersecting the direction in which the inlet region extends in the inlet region.

  According to such a configuration, in the stirring space, the moving fluid moves to the inner wall of the outer shell member positioned in front of the inlet by the cylindrical portion. And it penetrates the inside of a cylindrical part (namely, entrance region in diffusion space) through the connection port of the cylindrical part located in the other side of an entrance. For this reason, the moving distance of the moving fluid in the stirring space becomes long. Therefore, the moving fluid is effectively agitated.

  Further, the cylindrical portion circulates the moving fluid in the direction intersecting the direction in which the inlet region extends in the inlet region. For this reason, the moving fluid goes to the outlet region while circling the side of the inlet region. The exit region then extends from the entrance region toward the exit. Further, the exit area extends laterally from the end of the entrance area on the exit side. For this reason, the moving fluid that has passed through the inlet region while circling is diffused toward the outlet in the outlet region. Therefore, the moving fluid is effectively diffused.

  In the present disclosure, the facing member may be arranged to face the outlet and partition the diffusion space that covers the outlet and the stirring space. The agitation unit may further include at least one agitation blade that is a plate-like member that moves the moving fluid that passes through the inlet toward an opposing part that is a predetermined portion of the opposing member. The agitation unit may agitate the moving fluid by moving the moving fluid toward the inner wall of the outer shell member located on the inlet side of the opposing member by the opposing part of the opposing member. Further, the diffusion unit may be at least one plate-like member that diffuses the moving fluid in the diffusion space by adjusting the path of the moving fluid that passes through the connection port.

  According to such a configuration, in the stirring space, the moving fluid moves toward the facing portion of the facing member by at least one stirring blade. Then, the moving fluid moves toward the inner wall of the outer shell member located on the inlet side of the facing member by the facing portion. That is, the moving fluid moves so as to flow backward in the flow path. Thereafter, the moving fluid enters the diffusion space through the connection port provided in the facing member. For this reason, the moving distance of the moving fluid in the stirring space becomes long. Therefore, the moving fluid is effectively agitated.

  The diffusion unit diffuses the moving fluid in the diffusion space by adjusting the path of the moving fluid passing through the connection port. Therefore, the moving fluid is effectively diffused.

FIG. 1A is a side view showing an internal configuration of the stirring apparatus according to the first embodiment when viewed from the side of the inlet and the outlet. FIG. 1B is a perspective view illustrating an internal configuration of the stirring device according to the first embodiment. FIG. 2A is a side view showing an internal configuration (a cross section of the cylindrical portion or the like) of the stirring device according to the first embodiment when viewed from a position facing the outlet. FIG. 2B is a side view showing an internal configuration of the stirring device according to the second embodiment when viewed from the side of the inlet and the outlet. It is a perspective view which shows the structure inside the stirring apparatus of 2nd Embodiment.

  DESCRIPTION OF SYMBOLS 10,40 ... Agitation apparatus, 12 ... Flow path, 13 ... Outer shell member, 13a ... Inlet, 13b ... Outlet, 14 ... Cylindrical part, 14a ... Connection port, 15 ... Outlet side wall part, 16 ... Mixing space, 17 ... Diffusion space, 17a ... inlet region, 17b ... outlet region, 18 ... injection part, 18a ... injection hole part, 20 ... upstream pipe, 30 ... downstream pipe, 31 ... purification device, 42 ... flow path, 43 ... outer shell member, 43a ... inlet, 43b ... outlet, 44 ... opposing member, 44a ... opposing part, 44b ... connection port, 44c ... diffusion part, 45 ... stirring blade, 46 ... mixing space, 47 ... diffusion space, 48 ... injection part, 48a ... Injection hole part.

  Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Embodiments of the present disclosure are not limited to the following embodiments, and various forms can be adopted as long as they belong to the technical scope of the present disclosure.

[First Embodiment]
[Description of configuration]
The stirring device 10 according to the first embodiment is provided, for example, in an exhaust path of a diesel engine mounted on a vehicle or the like (FIGS. 1A, 1B, 2A). The stirring device 10 is a joint-shaped member. The stirring device 10 connects the upstream pipe 20 and the downstream pipe 30. As an example, an oxidation catalyst 21 is disposed in the upstream pipe 20. The oxidation catalyst 21 oxidizes substances such as nitrogen monoxide (NO), carbon monoxide (CO), and hydrocarbon (HC) contained in the exhaust gas. Further, as an example, an SCR catalyst 31 (Selective Catalytic Reduction) is arranged in the downstream pipe 30. The SCR catalyst 31 reduces NOx in the exhaust gas.

  The agitation device 10 has a cylindrical flow path 12 inside. The flow path 12 connects the end of the upstream pipe 20 and the end of the downstream pipe 30. The exhaust gas that has passed through the upstream pipe 20 enters the downstream pipe 30 through the flow path 12. As an example, the upstream pipe 20 and the downstream pipe 30 extend in a direction intersecting 90 ° or substantially 90 °. For this reason, the exhaust gas that has entered the flow path 12 moves along the movement path 11 bent in an L shape and reaches the downstream pipe 30.

  The angle at which the upstream pipe 20 and the downstream pipe 30 intersect may be an angle other than 90 °. In addition, the upstream pipe 20 and the downstream pipe 30 may extend in parallel, and the stirring device 10 may connect the end of the upstream pipe 20 and the end of the downstream pipe 30. Moreover, the shape of the flow path 12 is not limited to a cylindrical shape, and may be a polygonal column shape. Further, the flow path 12 may be, for example, a bent shape or a curved shape. Even in such a case, the exhaust gas that has entered the flow path 12 moves along the curved movement path and reaches the downstream pipe 30.

  The flow channel 12 has a mixing space 16 and a diffusion space 17. The mixing space 16 is connected to the inlet 13 a of the flow path 12. In the mixing space 16, the exhaust gas is agitated. On the other hand, the diffusion space 17 is connected to the outlet 13 b of the flow path 12. In the diffusion space 17, exhaust gas is diffused.

Moreover, the stirring apparatus 10 has the outer shell member 13, the cylindrical part 14, and the exit side wall part 15 grade | etc.,.
The outer shell member 13 is a cylindrical member that covers the flow path 12. In other words, the outer shell member 13 connects the end of the upstream pipe 20 and the end of the downstream pipe 30. The outer shell member 13 is a joint-shaped member. The outer shell member 13 has an inlet 13a and an outlet 13b. The inlet 13 a is connected to the upstream pipe 20. The inlet 13 a faces the side portion of the flow path 12. In addition, the outlet 13 b is connected to the downstream pipe 30. The outlet 13 b faces the end of the flow path 12. In other words, the flow path 12 extends from the outlet 13b to the front of the outlet 13b.

  Further, the outer shell member 13 has an injection unit 18. The injection unit 18 is a cylindrical part that protrudes toward the outside of the flow path 12. The injection unit 18 is located on the side surface of the outer shell member 13. The injection unit 18 is provided at the base portion of the upstream pipe 20 in the outer shell member 13. In addition, the position of the injection part 18 is not limited to the position of this base part. Specifically, for example, the injection unit 18 may be provided in another place in the outer shell member 13. For example, the injection unit 18 may be provided in the upstream pipe 20. An injection hole 18 a that is a hole is provided at the tip of the injection unit 18. An injection device (not shown) injects an SCR reducing agent (for example, urea water) toward the mixing space 16 of the flow path 12 via the injection unit 18. The SCR reducing agent is used for exhaust gas purification by the SCR catalyst 31 in the downstream pipe 30 (details will be described later).

  Moreover, the cylindrical part 14 and the exit side wall part 15 are plate-shaped parts. The cylindrical portion 14 and the outlet side wall portion 15 are provided in the flow path 12. The cylindrical part 14 and the outlet side wall part 15 partition the mixing space 16 and the diffusion space 17. In the mixing space 16, the cylindrical part 14 is in a state of facing the path of the exhaust gas that has passed through the inlet 13a. The cylindrical portion 14 moves the exhaust gas toward a side different from the side where the outlet 13b is located (details will be described later). As a result, the exhaust gas is agitated in the mixing space 16.

  On the other hand, the diffusion space 17 extends from the outlet 13b toward the inlet 13a. The diffusion space 17 has an entrance region 17a and an exit region 17b. The inlet region 17a is a columnar region that extends from the front surface of the inlet 13a toward the outlet 13b. The shape of the entrance region 17a is not limited to a cylindrical shape, and may be a long and narrow region such as a polygonal column. In other words, the inlet region 17 a extends along the flow path 12. The side part of the entrance region 17a is located in front of the entrance 13a.

  On the other hand, the exit area 17b is an area that covers the front of the exit 13b. The outlet area 17b connects the inlet area 17a and the outlet 13b. The outlet region 17b extends from the end of the inlet region 17a on the outlet 13b side toward the outlet 13b. The outlet region 17b extends laterally from the end of the inlet region 17a on the outlet 13b side. The inlet region 17a is arranged so as to protrude from the center of the outlet region 17b. The outlet region 17b has a circular cross section parallel to the outlet 13b. As the outlet region 17b approaches the outlet 13b, the diameter of the cross section increases. The shape of the cross section is not limited to a circle. The cross section can have various shapes.

  The mixing space 16 is located in front of the entrance 13a. The mixing space 16 surrounds the side portion of the entrance region 17a. The mixing space 16 covers the side surface of the outer shell member 13 from the inside.

  And the cylindrical part 14 is extended toward the exit 13b from the front of the inlet 13a. In other words, the cylindrical portion 14 extends along the flow path 12 from the front surface of the inlet 13a. The side surface of the cylindrical portion 14 is located in front of the inlet 13a. In other words, the cylindrical portion 14 is in a state facing the course of the exhaust gas that has passed through the inlet 13 a in the mixing space 16. The cylindrical part 14 protrudes from the center of the exit side wall part 15, and covers the side part of the entrance area | region 17a. Further, the end of the cylindrical portion 14 on the inlet 13a side is closed by a lid member 14b. That is, the cylindrical portion 14 partitions the entrance region 17 a and the mixing space 16. And the cylindrical part 14 moves the exhaust gas which collided with the said cylindrical part 14 toward the inner wall of the outer shell member 13 located ahead of the inlet 13a (details are mentioned later). As a result, the exhaust gas is agitated in the mixing space 16. Note that the cylindrical portion 14 is not limited to a cylindrical shape, and may be a cylindrical elongated portion having various shapes.

On the other hand, the outlet side wall 15 is located in front of the outlet 13b. The outlet side wall portion 15 partitions the outlet region 17b and the mixing space 16 from each other.
That is, the mixing space 16 is located outside the cylindrical portion 14. The mixing space 16 is located on the inlet 13a side of the outlet side wall 15. On the other hand, the entrance region 17 a is located inside the tubular portion 14. The outlet region 17b is located on the outlet 13b side of the outlet side wall portion 15.

  Moreover, the cylindrical part 14 has the connection port 14a. The connection port 14a connects the mixing space 16 and the entrance region 17a. The connection port 14a is a rectangular opening. The longitudinal direction of the connection port 14a is a direction in which the tubular portion 14 extends. The shape of the connection port 14a is not limited to a rectangle, and can be various shapes. The connection port 14 a is located on the opposite side of the inlet 13 a in the cylindrical portion 14. In other words, the connection port 14 a is located on the outer peripheral side of the movement path 11 in the cylindrical portion 14.

  Further, the tubular portion 14 and the outlet side wall portion 15 diffuse the exhaust gas moving in the diffusion space 17. The exhaust gas that has entered the inlet region 17 a from the connection port 14 a collides with the inner wall of the cylindrical portion 14. As a result, the exhaust gas moves along the inner wall of the cylindrical portion 14. Thereby, exhaust gas goes to the exit area | region 17b, circling the side part of the entrance area | region 17a. Moreover, the exit side wall part 15 has spread toward the exit 13b.

  On the other hand, the injection unit 18 faces a portion of the side surface of the cylindrical portion 14 on the inlet 13a side (injected portion 14c). The injected portion 14 c is located on the inner peripheral side of the moving path 11 on the side surface of the cylindrical portion 14. The injected portion 14 c is located on the side opposite to the connection port 14 a on the side surface of the tubular portion 14. The injected portion 14c is a portion where the exhaust gas immediately after entering from the inlet 13a collides. For this reason, the to-be-injected part 14c becomes high temperature.

[Flow of exhaust gas]
First, the flow of exhaust gas in the mixing space 16 will be described. Hereinafter, the right side toward the outlet 13b in a state where the inlet 13a is positioned upward is simply referred to as the right side. In the same state, the left side toward the outlet 13b is simply the left side.

  Part of the exhaust gas that has entered the mixing space 16 from the inlet 13 a collides with the cylindrical portion 14. The exhaust gas that has collided with the cylindrical portion 14 enters the right or left side of the cylindrical portion 14 and moves to the bottom portion 13 c on the inner wall of the outer shell member 13. The bottom portion 13 c is a portion located on the opposite side of the inlet 13 a on the inner wall of the outer shell member 13. That is, the exhaust gas passes through the right side or the left side of the cylindrical portion 14, travels toward the bottom portion 13 c, and reaches the front of the connection port 14 a. And the exhaust gas which reached | attained the front of the connection port 14a approachs the entrance area | region 17a from the connection port 14a along the approach path 19b. A part of the exhaust gas that has reached the front of the connection port 14a passes through the front of the connection port 14a and travels toward the inlet 13a. The exhaust gas circulates around the side of the cylindrical portion 14 and reaches the bottom portion 13c again. Then, the exhaust gas enters the inlet region 17a from the connection port 14a along the approach path 19b.

  That is, the exhaust gas moves along the circulation path 19a passing through the side of the cylindrical portion 14 in the mixing space 16, and enters the inlet region 17a from the connection port 14a (FIG. 2A). In addition, there exists exhaust gas that moves along the clockwise route 19a and exhaust gas that moves along the counterclockwise route 19a. In addition, some exhaust gas enters the inlet region 17a from the connection port 14a after making one or more rounds around the cylindrical portion 14. In other words, the exhaust gas moves along the circulation path 19a, which is a detour path, and then enters the inlet region 17a. Thereby, exhaust gas is stirred.

  At this time, the SCR reducing agent is injected from the injection hole portion 18a toward the injected portion 14c in the cylindrical portion 14. For this reason, the exhaust gas and the SCR reducing agent are mixed by stirring the exhaust gas. Further, as described above, the injected portion 14c is at a high temperature. For this reason, mixing is performed in a state where the SCR reducing agent is at a high temperature. Therefore, the exhaust gas is effectively purified in the SCR catalyst 31 of the downstream pipe 30.

  The SCR reducing agent may be injected toward a place other than the injected portion 14c. In such a case, it is preferable to determine the position and orientation of the injection unit 18 according to the location where the SCR reducing agent is injected.

  Next, the flow of exhaust gas in the diffusion space 17 will be described. The exhaust gas that has entered the inlet region 17a from the connection port 14a collides with a portion of the inner wall of the cylindrical portion 14 that is located in front of the connection port 14a. Due to the collision, the path of the exhaust gas changes in the circumferential direction 19c of the inlet region 17a. There is exhaust gas whose course changes in the clockwise circumferential direction 19c and exhaust gas whose course changes in the counterclockwise circumferential direction 19c. Thereby, exhaust gas goes to the exit 13b, circling the side part of the entrance area | region 17a. At this time, the exhaust gas circulates in the inlet region 17a in a direction intersecting the direction in which the inlet region 17a extends. In other words, the exhaust gas moves from the inlet region 17 a to the outlet 13 b along a spiral path along the inner wall of the cylindrical portion 14.

  And the exit area | region 17b has spread to the side from the edge part by the side of the exit 13b of the entrance area | region 17a. For this reason, the exhaust gas that has moved in the inlet region 17a along such a path moves along the diffusion path 19d that spreads toward the outlet 13b when it reaches the outlet region 17b. Accordingly, the exhaust gas is diffused toward the outlet 13b.

[effect]
(1a) According to the first embodiment, the exhaust gas that has entered the flow path 12 of the stirring device 10 from the inlet 13a moves to a side different from the side where the outlet 13b is located by the cylindrical portion 14. That is, the exhaust gas does not immediately go to the outlet 13b, but reaches the outlet 13b after moving along the detour path. For this reason, the moving distance of the exhaust gas in the flow path 12 becomes long. Furthermore, a complicated turbulent flow is generated in the flow path 12 due to the collision between the exhaust gas and the cylindrical portion 14 and the flow of the exhaust gas along the detour path. For this reason, the exhaust gas is effectively stirred in the flow path 12. Therefore, even if the flow path 12 is short, the fluid can be well stirred in the flow path 12.

  (1b) In addition, the SCR reducing agent is added from the injection hole portion 18a to the exhaust gas moving along the detour path. For this reason, the mixing time of the exhaust gas and the SCR reducing agent becomes long. Moreover, since the complicated turbulent flow of the exhaust gas is generated in the flow path 12, the SCR reducing agent is effectively dispersed in the exhaust gas. Therefore, the exhaust gas and the SCR reducing agent can be mixed well.

  (1c) Further, the exhaust gas reaches the diffusion space 17 after being stirred in the mixing space 16. Then, after the exhaust gas is diffused in the diffusion space 17, it passes through the outlet 13b. For this reason, it is possible to prompt the exhaust gas to pass through the outlet 13b in a uniform state (a state where the exhaust gas is not biased to a specific region). Accordingly, it is possible to prompt the exhaust gas to reach the SCR catalyst 31 of the downstream pipe 30 in a uniform state. As a result, the exhaust gas purification effect by the SCR catalyst 31 is improved.

  Further, by providing the mixing space 16 and the diffusion space 17 in the flow path 12, the moving distance of the exhaust gas in the flow path 12 becomes longer. For this reason, exhaust gas is stirred more effectively. Furthermore, the mixing time of the exhaust gas and the SCR reducing agent becomes longer. For this reason, exhaust gas and an SCR reducing agent can be mixed more effectively.

  (1d) In the mixing space 16, the exhaust gas moves to the inner wall of the outer shell member 13 located in front of the inlet 13 a by the cylindrical portion 14. Then, the air enters the inside of the cylindrical portion 14 (that is, the inlet region 17a in the diffusion space 17) through the connection port 14a of the cylindrical portion 14 located on the opposite side of the inlet 13a. More specifically, the exhaust gas moves along the circulation path 19a passing through the side of the cylindrical portion 14, and enters the inlet region 17a from the connection port 14a. A part of the exhaust gas enters the inlet region 17a from the connection port 14a after making one or more rounds of the circulation path 19a. For this reason, the moving distance of the exhaust gas in the mixing space 16 becomes long. Therefore, the exhaust gas is effectively stirred.

  Moreover, the cylindrical part 14 circulates exhaust gas in the direction which cross | intersects with respect to the direction where the inlet_port | entrance area | region 17a extends in the inlet_port | entrance area | region 17a. For this reason, exhaust gas goes to the exit area | region 17b, circling the side part of the entrance area | region 17a. The outlet region 17b extends from the inlet region 17a toward the outlet 13b. Moreover, the exit area | region 17b has spread to the side from the edge part of the exit side of the entrance area | region 17a. For this reason, when the exhaust gas reaches the outlet region 17b, the exhaust gas moves along the diffusion path 19d spreading toward the outlet 13b. Therefore, the exhaust gas is effectively diffused.

[Second Embodiment]
[Description of configuration]
Similarly to the first embodiment, the stirring device 40 according to the second embodiment is also provided in the exhaust path of the diesel engine of the vehicle (FIGS. 2B and 3). Below, description is abbreviate | omitted about a common structure and it demonstrates centering around difference. Note that the same reference numerals as those in the first embodiment indicate the same configurations as those in the first embodiment, and description thereof will be omitted.

  The stirrer 40 is a joint-like member similar to the first embodiment. The stirring device 40 connects the upstream pipe 20 and the downstream pipe 30. The upstream pipe 20 and the downstream pipe 30 are arranged in the same manner as in the first embodiment. The stirring device 40 has a cylindrical flow channel 42 similar to that of the first embodiment. The exhaust gas that has entered the flow path 42 moves along the movement path 41 bent in an L shape and reaches the downstream pipe 30.

  Further, the flow path 42 has a mixing space 46 and a diffusion space 47. The mixing space 46 is connected to the inlet 43a of the flow path 42 as in the first embodiment. In the mixing space 46, the exhaust gas is agitated. On the other hand, the diffusion space 47 is connected to the outlet 43b of the flow path 42 as in the first embodiment. In the diffusion space 47, the exhaust gas is diffused.

The stirring device 40 includes an outer shell member 43, a counter member 44, at least one stirring blade 45 (a plurality of stirring blades 45 in this embodiment), a diffusion portion 44c, and the like.
The outer shell member 43 is a cylindrical member that covers the flow path 42 as in the first embodiment. The outer shell member 43 has the same inlet 43a and outlet 43b as in the first embodiment. Hereinafter, a direction from the entrance 43a toward the front of the entrance 43a is referred to as a vertical direction. Moreover, the direction orthogonal to the up-down direction and orthogonal to the direction from the outlet 43b toward the front of the outlet 43b is referred to as the left-right direction. Further, the inner peripheral side of the movement path 41 is simply referred to as an inner peripheral side. Further, the outer peripheral side of the movement path 41 is simply referred to as the outer peripheral side.

  Further, the outer shell member 43 has an injection part 48. The injection portion 48 is a cylindrical portion that protrudes toward the outside of the flow path 42. The injection portion 48 is provided in a portion of the outer shell member 43 that faces the outlet 43b. As in the first embodiment, an injection hole 48 a that is a hole is provided at the tip of the injection unit 48. As in the first embodiment, an injection device (not shown) injects the SCR reducing agent toward the mixing space 46 of the flow path 42 via the injection unit 48.

  The plurality of stirring blades 45 are provided at the inlet 43a. One stirring blade 45 may be provided at the inlet 43a. Each stirring blade 45 is an elongated rectangular plate-shaped member. The plurality of stirring blades 45 are arranged along the left-right direction. Moreover, the some stirring blade 45 is located in a line toward the exit 43b. The direction of each stirring blade 45 is inclined toward the outlet 43b with respect to the vertical direction. Each stirring blade 45 directs the path of the exhaust gas passing through the inlet 43a toward the inner peripheral side.

  The facing member 44 is provided in the flow path 42. The facing member 44 is a flat plate-like member that is disposed in a state of facing the outlet 43b. The facing member 44 is not limited to a flat plate shape, and may be, for example, a curved or bent plate member. The facing member 44 partitions the mixing space 46 and the diffusion space 47. The mixing space 46 extends in front of the entrance 43a. On the other hand, the diffusion space 47 extends in front of the outlet 43b. That is, the inlet 43a side of the facing member 44 in the flow path 42 is a mixing space. In addition, the outlet 43 b side of the facing member 44 in the flow path 42 is a diffusion space 47.

  The opposing member 44 has an end on the inlet 43a side inclined toward the outlet 43b with respect to the vertical direction. The exhaust gas that has passed through the inlet 43 a is moved toward the facing portion 44 a that is a portion on the inner peripheral side of the facing member 44 by the plurality of stirring blades 45. In other words, the facing portion 44 a is a portion located on the inlet 43 a side of the facing member 44. That is, the facing portion 44a in the mixing space 46 is in a state facing the course of the exhaust gas that has passed through the inlet 43a. The facing portion 44 a moves the exhaust gas that has collided with the facing portion 44 a toward a portion located in front of the outlet 43 b on the inner wall of the outer shell member 43. In other words, the facing portion 44 a moves the exhaust gas toward a portion closer to the inlet 43 a than the facing member 44 on the inner wall of the outer shell member 43. More specifically, the facing portion 44a moves the exhaust gas toward an outer peripheral portion 43c that is a portion located on the outer peripheral side of the inner wall of the outer shell member 43 (details will be described later). Thereby, the exhaust gas is agitated in the mixing space 46.

  Moreover, the opposing member 44 has the connection port 44b in the outer peripheral side of the opposing part 44a. The connection port 44 b connects the mixing space 46 and the diffusion space 47. The connection port 44b has a plurality of elongated rectangular openings extending in the left-right direction. In the second embodiment, as an example, the connection port 44b has three openings. The number of openings is not limited to three. The plurality of openings are arranged in the vertical direction. The shape of the connection port 44b is not limited to an elongated rectangle, and may be various shapes.

  Further, the diffusion unit 44 c diffuses the exhaust gas moving through the diffusion space 47. The diffusion portion 44c has a plurality of diffusion blades that are elongated rectangular plate-like members. The diffusing unit 44c may have one diffusing blade. The diffusion blades are provided corresponding to openings other than the opening located on the outermost periphery side among the plurality of openings in the connection port 44b. On the other hand, one diffusion blade may be provided corresponding to the opening located on the outermost peripheral side. Each diffusion blade is arranged along the left-right direction. Then, the direction of each diffusion blade is inclined toward the inner peripheral side toward the outlet 43b. Moreover, the inclination becomes large as the diffusion blades on the inner peripheral side. Thereby, the course of the exhaust gas passing through the opening provided with the diffusion blades is inclined toward the inner peripheral side. As a result, the exhaust gas diffuses in the diffusion space 47 (details will be described later).

  On the other hand, the ejection part 48 faces the facing part 44 a of the facing member 44. The facing portion 44a is a portion where the exhaust gas immediately after entering from the inlet 43a collides. For this reason, the opposing part 44a becomes high temperature.

[Flow of exhaust gas]
First, the flow of exhaust gas in the mixing space 46 will be described. The exhaust gas that has entered the mixing space 46 from the inlet 43a moves along the path 49a. Thereafter, the exhaust gas collides with the facing portion 44a of the facing member 44 and moves toward the outer peripheral portion 43c. Further, the exhaust gas moves to the outlet 43b side along the outer peripheral portion 43c and reaches before the connection port 44b. Part of the exhaust gas that has reached before the connection port 44b enters the diffusion space 47 from the connection port 44b. Further, a part of the exhaust gas moves toward the facing portion 44a through the connection port 44b. In front of the facing portion 44a, an exhaust gas flow toward the outer peripheral portion 43c is generated. The exhaust gas that has passed through the connection port 44b rides on the flow and moves to the outer peripheral portion 43c again.

  That is, in the mixing space 46, the exhaust gas collides with the facing portion 44a and then moves along the circulation path 49b that circulates in front of the facing member 44. Part of the exhaust gas enters the diffusion space 47 from the connection port 44b before making a round of the circulation path 49b. Further, some exhaust gas enters the diffusion space 47 through the connection port 44b after making one or more rounds of the circulation path. In other words, the exhaust gas enters the diffusion space 47 after moving along the circulation path 49 b that is a detour path. Thereby, exhaust gas is stirred.

  At this time, the SCR reducing agent is injected from the injection hole portion 48a toward the facing portion 44a. For this reason, the exhaust gas and the SCR reducing agent are mixed by stirring the exhaust gas. Further, as described above, the facing portion 44a is at a high temperature. For this reason, mixing is performed in a state where the SCR reducing agent is at a high temperature. For this reason, the exhaust gas is effectively purified in the SCR catalyst 31 of the downstream pipe 30.

  The SCR reducing agent may be injected toward a place other than the facing portion 44a. In the case of performing such injection, it is preferable to determine the position and orientation of the injection unit 48 according to the location where the SCR reducing agent is injected.

  Next, the flow of exhaust gas in the diffusion space 47 will be described. As described above, the path of the exhaust gas passing through the connection port 44b is adjusted by the diffusion portion 44c. That is, the path is greatly inclined toward the inner periphery as the exhaust gas passes through the inner opening of the connection port 44b. Thus, the exhaust gas is diffused in the vertical direction by passing through the connection port 44b. As a result, the exhaust gas moves along the diffusion path 49c spreading in the vertical direction. Therefore, the exhaust gas diffuses in the diffusion space 47.

[Modification]
In the second embodiment, the connection port 44 b is provided on the outer peripheral side of the facing member 44. Further, the inner peripheral side of the facing member 44 is a facing portion 44a. The exhaust gas that has entered the flow path 42 from the inlet 43a moves toward the facing portion 44a by the plurality of stirring blades 45. Due to the facing portion 44 a, the exhaust gas moves toward the outer peripheral portion 43 c on the inner wall of the outer shell member 43. Thereafter, the exhaust gas enters the diffusion space 47 from the connection port 44b.

  However, a portion on the outer peripheral side of the facing member 44 or a portion on one side of the facing member 44 in the left-right direction may be used as the facing portion. Further, a connection port may be provided on the opposite side of the facing portion of the facing member 44. Further, the exhaust gas entering from the inlet 43 a may be directed to the facing portion of the facing member 44 by the plurality of stirring blades 45. And you may move exhaust gas toward the outer peripheral part 43c by such an opposing part.

  In such a case, it is preferable to adjust the direction or shape of the facing member 44 according to the position of the facing portion so that the exhaust gas is preferably moved to the outer peripheral portion 43c. Further, it is preferable to adjust the direction of the connection port and the angle of the diffusion blade according to the position of the facing portion or the orientation of the facing member 44 so that the exhaust gas is diffused well in the diffusion space. .

[effect]
According to the second embodiment, in addition to the effects (1b) and (1c) of the first embodiment, the following effects can be obtained.

  According to the second embodiment, the exhaust gas that has entered the flow path 42 of the stirring device 40 from the inlet 43 a moves to a side different from the side where the outlet 43 b is located by the facing portion 44 a of the facing member 44. That is, the exhaust gas does not immediately go to the outlet 43b, but reaches the outlet 43b after moving along the detour path. For this reason, the moving distance of the exhaust gas in the flow path 42 becomes long. Furthermore, a complicated turbulent flow is generated in the flow path 42 due to the collision between the exhaust gas and the facing portion 44a and the flow of the exhaust gas along the detour path. For this reason, the exhaust gas is effectively stirred in the flow path 42. Therefore, even when the flow path 42 is short, the fluid can be well stirred in the flow path 42.

  Specifically, in the mixing space 46, the exhaust gas moves toward the facing portion 44 a by the plurality of stirring blades 45. The exhaust gas moves toward the inner wall of the outer shell member 43 located on the inlet 43a side of the facing member 44 by the facing portion 44a. That is, the exhaust gas moves so as to flow backward in the flow path 42. Thereafter, the exhaust gas passes through the connection port 44 b provided in the facing member 44 and enters the diffusion space 47. More specifically, in the mixing space 46, the exhaust gas moves along a circulation path 49 b that circulates in front of the facing member 44. A part of the exhaust gas enters the diffusion space 47 from the connection port 44b before making a round of the circulation path 49b. Further, a part of the exhaust gas enters the diffusion space 47 through the connection port 44b after making one or more rounds in the circulation path 49b. For this reason, the moving distance of the exhaust gas in the mixing space 46 becomes long. Therefore, the exhaust gas is effectively stirred.

  Further, the diffusion unit 44 c diffuses the exhaust gas in the diffusion space 47 by adjusting the route of the exhaust gas that passes through the connection port 44 b. More specifically, the exhaust gas passing through the connection port 44b is diffused in the vertical direction by the diffusion portion 44c. Therefore, the exhaust gas is effectively diffused.

[Other Embodiments]
(1) In the first and second embodiments, the injection units 18 and 48 are provided on the outer shell members 13 and 43. However, the injection parts 18 and 48 may not be provided on the outer shell members 13 and 43. And you may provide the same injection | spraying part in the upstream of the flow paths 12 and 42 of the stirring apparatuses 10 and 40. FIG. Specifically, for example, a similar injection unit may be provided on the wall of the exhaust pipe between the oxidation catalyst 21 of the upstream pipe 20 and the inlets 13a and 43a of the stirring devices 10 and 40. And you may flow in an SCR reducing agent from this injection part.

  (2) In the first and second embodiments, the upstream pipe 20 is provided with the oxidation catalyst 21, and the downstream pipe 30 is provided with the SCR catalyst 31. However, the upstream pipe 20 may be provided with an exhaust gas purification device different from the oxidation catalyst 21. Further, the upstream pipe 20 may not be provided with an exhaust gas purification device. Further, the downstream pipe 30 may be provided with an exhaust gas purification device different from the SCR catalyst 31. In such a case, instead of the SCR reducing agent, it is conceivable that a purification agent that is a fluid used for purification by the purification device of the downstream pipe 30 flows into the mixing spaces 16 and 46 from the injection units 18 and 48. .

  (3) The stirring devices 10 and 40 of the first and second embodiments may be provided in an exhaust path other than the vehicle. In addition, the agitation devices 10 and 40 may be provided in an exhaust path of an engine that operates with a fuel other than diesel such as gasoline. Furthermore, the stirring devices 10 and 40 may be provided in a path through which a fluid other than the exhaust gas flows. The fluid may be a liquid or a gas.

  Here, the fluid flowing through the stirring devices 10 and 40 is referred to as a moving fluid. In the case where the stirring devices 10 and 40 are provided in the path of the moving fluid other than the exhaust gas of the diesel engine, it is conceivable to provide the upstream pipe 20 and the downstream pipe 30 with a purifier according to the nature of the moving fluid. In addition, it is conceivable that a purifying agent corresponding to the moving fluid or the purifying device of the downstream pipe 30 is caused to flow into the mixing spaces 16 and 46 from the injection units 18 and 48. Further, depending on the nature of the moving fluid, it may be assumed that no purification device is provided in the upstream pipe 20 or the downstream pipe 30. Further, depending on the nature of the purification device for the moving fluid or the downstream pipe 30, it may be assumed that the purification agent does not flow from the injection units 18 and 48. In such a case, it is not necessary to provide the injection units 18 and 48 in the stirring devices 10 and 40.

  (4) Moreover, the stirring apparatuses 10 and 40 of the first and second embodiments have mixing spaces 16 and 46 and diffusion spaces 17 and 47. However, the stirring devices 10 and 40 may not have the diffusion spaces 17 and 47. That is, the stirrer may discharge the exhaust gas from the outlet after stirring the exhaust gas in the same mixing space as in the first and second embodiments.

[Correspondence with Claims]
The correspondence between the terms used in the description of the above embodiment and the terms used in the description of the claims is shown.

In the first and second embodiments, the exhaust gas corresponds to an example of a moving fluid, the SCR reducing agent corresponds to an example of an additional fluid, and the mixing spaces 16 and 46 correspond to an example of a stirring space.
Moreover, the cylindrical part 14 and the exit side wall part 15 in 1st Embodiment correspond to an example of an opposing member, a stirring part, and a spreading | diffusion part. Further, the opposing member 44 and the plurality of stirring blades 45 in the second embodiment correspond to an example of a stirring unit.

Claims (4)

A stirring device that stirs a moving fluid that moves through a flow path,
An end portion of an upstream pipe which is a tubular member located on the upstream side of the flow path, and a tubular member located on the downstream side of the flow path, which intersects the upstream pipe or the upstream pipe A joint-shaped member that connects the end of the downstream pipe that is a member extending in a direction parallel to the outer shell, and an outer shell member that is a member that covers the flow path,
The moving fluid is moved toward a side different from the side where the outlet of the channel is located by a facing member provided in the channel in a state of facing the path of the moving fluid that has passed through the inlet of the channel. A stirring unit for stirring the moving fluid;
Equipped with a,
The flow path has a stirring space connected to the inlet and a diffusion space connected to the outlet,
The opposing member partitions the stirring space and the diffusion space, and has a connection port that connects the stirring space and the diffusion space,
The stirring unit stirs the moving fluid in the stirring space,
The stirring device further includes a diffusion unit that diffuses the moving fluid that moves in the diffusion space,
The facing member is arranged facing the outlet, and partitions the diffusion space covering the outlet from the stirring space,
The stirring unit further includes at least one stirring blade that is a plate-like member that moves the moving fluid that passes through the inlet toward a facing portion that is a predetermined portion of the facing member;
The agitation unit agitates the moving fluid by moving the moving fluid toward the inner wall of the outer shell member located on the inlet side of the opposing member by the opposing portion of the opposing member. ,
The diffusion unit is an agitation device that is at least one plate-like member that diffuses the moving fluid in the diffusion space by adjusting a path of the moving fluid that passes through the connection port . A stirring device that stirs a moving fluid that moves through a flow path,
An end portion of an upstream pipe which is a tubular member located on the upstream side of the flow path, and a tubular member located on the downstream side of the flow path, which intersects the upstream pipe or the upstream pipe A joint-shaped member that connects the end of the downstream pipe that is a member extending in a direction parallel to the outer shell, and an outer shell member that is a member that covers the flow path,
The moving fluid is moved toward a side different from the side where the outlet of the channel is located by a facing member provided in the channel in a state of facing the path of the moving fluid that has passed through the inlet of the channel. A stirring unit for stirring the moving fluid;
Equipped with a,
The flow path has a stirring space connected to the inlet and a diffusion space connected to the outlet,
The opposing member partitions the stirring space and the diffusion space, and has a connection port that connects the stirring space and the diffusion space,
The stirring unit stirs the moving fluid in the stirring space,
The stirring device further includes a diffusion unit that diffuses the moving fluid that moves in the diffusion space,
The flow path has a portion extending forward from the outlet, and the inlet faces a side of the portion;
The diffusion space is an area extending toward the outlet, and has an inlet area in which a side portion is located in front of the inlet and is surrounded by the stirring space, the inlet area, and the inlet area. An exit region, which is a region connecting the exit, and is a region that spreads laterally from an end of the entrance region on the exit side,
The facing member has a cylindrical portion that covers a side portion of the inlet region and is arranged in a state facing the path of the moving fluid that has passed through the inlet.
The connection port is provided on the opposite side of the cylindrical portion where the inlet is located,
The stirring unit stirs the moving fluid by moving the moving fluid toward the inner wall of the outer shell member located in front of the inlet by the cylindrical portion,
The diffusion part is the cylindrical part,
The cylindrical portion diffuses the moving fluid in the outlet region by circulating the moving fluid in the direction intersecting the direction in which the inlet region extends in the inlet region,
The outer shell member is a stirring device having a hole for allowing an additional fluid, which is a fluid different from the moving fluid, to enter the stirring space toward the outer wall of the cylindrical portion . The stirrer according to claim 1,
The outer shell member has a hole for allowing an additional fluid, which is a fluid different from the moving fluid, to enter the flow path;
A stirrer characterized by. The stirrer according to any one of claims 1 to 3 ,
The moving fluid is exhaust gas discharged from a vehicle engine,
The additional fluid is a fluid used for purification of the exhaust gas by a purification device provided in the downstream pipe,
A stirrer characterized by.

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