JP2018071360A - Exhaust purification device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an exhaust purification device, which increases a temperature of exhaust flowing in an exhaust passage by mixing the same with high temperature combustion gas supplied from a combustor, to entirely and uniformly mix the exhaust with the combustion gas while reducing a risk of an ignition failure and misfire in the combustor.SOLUTION: An exhaust purification device comprises: exhaust purification means (110) which purifies exhaust from an internal combustion engine (200); an introduction pipe (120) which introduces the exhaust into the exhaust purification means; a discharge pipe (130) which discharges the exhaust out of the exhaust purification means; and a combustor (140) configured to supply combustion gas to an inside of the introduction pipe through an opening section (141) at a tip of a protrusion section (142) protruded into the introduction pipe. In the exhaust purification device, a flow direction of the combustion gas from a combustion chamber to the opening section makes an acute angle with the flow direction of the exhaust in an upstream region (122). The protrusion section is protruded in at least one bent section (121) formed in the introduction pipe or in the upstream region of the bent section.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an exhaust emission control device. More specifically, the present invention relates to an exhaust emission control device that raises the temperature of exhaust gas by mixing high-temperature combustion gas supplied from a combustor with exhaust gas flowing through an exhaust passage, wherein the ignition failure and misfire in the combustor The present invention relates to an exhaust emission control device capable of mixing combustion gas and exhaust gas overall and uniformly while reducing problems such as these.

  Exhaust gas discharged from an internal combustion engine such as a diesel engine contains harmful substances such as soot particulates (PM) and nitrogen oxides (NOx). Therefore, from the viewpoint of protecting the global environment, for example, exhaust purification means such as a filter (DPF) that collects PM and a NOx reduction catalyst may be provided in the exhaust passage of the internal combustion engine to remove PM and NOx, thereby purifying the exhaust. Widely done.

  By the way, since PM accumulates in the DPF with the operation of the internal combustion engine, it is necessary to regenerate the DPF by burning the accumulated PM at a predetermined time. Further, when the temperature of the exhaust gas is low, such as when the internal combustion engine is cold started, the temperature of the catalyst is low and the catalyst is not activated, so that it is difficult to remove NOx by reduction. Therefore, in order to remove NOx contained in the exhaust gas, it is necessary to raise the temperature of the NOx reduction catalyst to a temperature sufficient to activate the NOx reduction catalyst.

  Therefore, in this technical field, fuel is burned in a burner (combustor) disposed in the exhaust passage to generate high-temperature combustion gas, which flows into exhaust purification means such as DPF and NOx reduction catalyst. It is known to raise the temperature of exhaust gas (see, for example, Patent Document 1). According to this, it is possible to increase the opportunity to regenerate the DPF by burning PM deposited on the DPF, or to quickly increase the temperature of the NOx reduction catalyst to activate the NOx reduction catalyst at an early stage. As a result, harmful substances (PM and NOx) contained in the exhaust discharged from the internal combustion engine can be effectively removed and the exhaust can be purified.

  However, if a combustor is disposed in the exhaust passage, for example, an ignition pressure fluctuation caused by an output fluctuation of the internal combustion engine or the like may cause a fuel ignition failure in the combustor, or fuel combustion may stop (hereinafter, “ It may be referred to as “misfire”).

  On the other hand, a configuration is also known in which a combustion gas outlet of a combustor disposed at a side branch portion intersecting the inside of the exhaust passage at a predetermined angle protrudes into the exhaust passage (for example, a patent) Reference 2). According to such a configuration, it is possible to reduce problems such as ignition failure and misfire in the combustor due to the pressure fluctuation of the exhaust gas accompanying the output fluctuation of the internal combustion engine as described above.

  However, in the exhaust emission control device according to the prior art having a configuration in which the combustor protrudes inside the exhaust passage as described above, it may be difficult to uniformly mix high-temperature combustion gas into the exhaust gas flowing through the exhaust passage. is there. Specifically, the high-temperature combustion gas supplied from the combustion gas outlet of the combustor into the exhaust passage mainly becomes a laminar flow that flows along the inner wall of the exhaust passage on the side from which the outlet of the combustor protrudes. In some cases, it is difficult to mix the exhaust gas flowing through the exhaust passage with the whole and uniformly.

  As a result, the temperature of the exhaust gas flowing into the exhaust gas purification means becomes non-uniform. For example, the NOx reduction catalyst can be increased by increasing the opportunity to regenerate the DPF by burning PM deposited on the DPF or by rapidly increasing the temperature of the NOx reduction catalyst. It may be difficult to activate the system at an early stage. As described above, in the exhaust emission control device according to the related art, it may be difficult to effectively remove harmful substances (PM and NOx) contained in the exhaust discharged from the internal combustion engine and purify the exhaust.

Japanese Patent No. 5494895 Special table 2014-527592 gazette

  As described above, in the technical field, in an exhaust gas purification apparatus that raises the temperature of exhaust gas by mixing high-temperature combustion gas supplied from a combustor into exhaust gas flowing through an exhaust passage, ignition failure and misfire in the combustor, etc. There is a need for a technique that can reduce the above problem while mixing the combustion gas and the exhaust gas in an overall and uniform manner. The present invention has been made to meet such a demand.

  In view of the above, an exhaust emission control device according to the present invention (hereinafter sometimes referred to as “the present invention device”) includes an exhaust gas purification means for reducing harmful substances contained in exhaust gas from an internal combustion engine, An introduction pipe that guides the exhaust gas to the exhaust gas purification unit; a discharge pipe that discharges the exhaust gas from the exhaust gas purification unit; and a combustor that supplies the combustion gas to the inside of the introduction pipe. The combustor includes a combustion chamber that generates combustion gas by combustion of fuel, and a protrusion that communicates with the combustion chamber and protrudes into the introduction pipe and has an opening at the tip. The combustor is configured to supply the combustion gas into the introduction pipe through the opening. Furthermore, an acute angle is formed between a combustion gas direction in which the combustion gas flows from the combustion chamber to the opening in the combustor and an exhaust direction in which the exhaust flows in the upstream region. Yes.

  The introduction tube has at least one bent portion. In addition, the protruding portion protrudes into the introduction tube at the bent portion of the introduction tube, or protrudes into the introduction tube in an upstream region of the introduction tube. The upstream region is a region of the introduction pipe adjacent to the bent portion on the internal combustion engine side.

  In one aspect of the present invention, the protruding portion protrudes into the introduction tube in an outer bent region that is an outer region of the bent portion of the introduction tube, or flows through the introduction tube. Along the flow direction of exhaust gas, the outer upstream region, which is closer to the internal combustion engine than the outer bent region, protrudes into the introduction pipe.

  In another aspect of the present invention, an angle formed by the combustion gas direction and the exhaust direction may be not less than 35 ° and not more than 85 °.

  In another aspect of the present invention, the opening vicinity sectional area is smaller than the opening upstream sectional area. The cross-sectional area in the vicinity of the opening is a cross-sectional area of the introduction pipe by at least one cross section among cross sections that intersect the opening and are orthogonal to the central axis of the introduction pipe. The upstream cross-sectional area of the opening is the introduction pipe having a cross section orthogonal to the central axis of the introduction pipe in a region of the introduction pipe adjacent to the internal combustion engine in a region where the protruding portion projects into the introduction pipe. Is the cross-sectional area.

  In another aspect of the present invention, the exhaust purification device includes a resistance member that is a member having a structure that prevents a flow of the combustion gas supplied to the inside of the introduction pipe through the opening and causes pressure loss. In addition. In this case, the resistance member may be at least one member selected from the group consisting of a slit, a convergent nozzle, an orifice, a contraction tube, a punching plate, a mesh plate, and a louver. Further, the resistance member may be at least one member selected from the group consisting of a slit, a convergent nozzle, an orifice, and a contraction tube.

  In another aspect of the present invention, the exhaust purification unit includes a reduction catalyst that reduces the harmful substance by a reduction reaction with a reducing agent, and the exhaust purification device is closer to the internal combustion engine than the protruding portion. Further provided is a reducing agent injection means for injecting the reducing agent into the introduction pipe at a location. In this case, the exhaust purification device may further include a heat radiating plate attached to the projecting portion so as to be able to conduct heat in a region between the reducing agent injection means and the exhaust purification means inside the introduction pipe. Good. Further, the heat radiating plate may be at least one member selected from the group consisting of a punching plate and a mesh plate.

  In another aspect of the invention, the protrusion has at least one bent portion. In this case, the bent portion of the projecting portion may be formed at the tip of the projecting portion, and the opening may be formed at the tip of the projecting portion on the opposite side of the combustion chamber. . Further, the bent portion formed at the tip of the protruding portion is configured such that the flow direction of the combustion gas supplied into the introduction pipe through the opening is the exhaust gas around the opening inside the introduction pipe. It can be configured to be parallel to the flow direction.

  As described above, in the apparatus of the present invention, the protruding portion of the combustor protrudes into the introduction pipe so that the combustion gas direction and the exhaust direction form an acute angle. As a result, it is possible to reduce problems such as poor ignition and misfire in the combustor due to the pressure fluctuation of the exhaust gas due to the output fluctuation of the internal combustion engine as described above.

  Furthermore, turbulent flow is generated in the exhaust gas flowing through the inside of the introduction pipe due to the projecting portion protruding inside the introduction pipe. In addition, the combustion gas generated by the combustor is supplied to the exhaust gas flowing through the inside of the introduction pipe through the opening formed at the tip of the protrusion. That is, in the apparatus of the present invention, combustion gas is mixed into the exhaust gas in which turbulent flow is generated. Therefore, mixing of exhaust gas and combustion gas is promoted.

  In addition to the above, since the introduction pipe provided in the device of the present invention has at least one bent portion, this also causes turbulence in the exhaust gas flowing inside the introduction pipe. Therefore, when the protrusion of the combustor protrudes into the introduction pipe at the bent portion of the introduction pipe, the exhaust flowing through the introduction pipe due to both the bending and the protrusion of the introduction pipe is more prominent. Turbulence occurs. As a result, mixing of exhaust gas and combustion gas is further promoted. On the other hand, when the protrusion of the combustor protrudes into the introduction pipe in the upstream region of the introduction pipe, the mixing of the exhaust gas and the combustion gas is promoted by the turbulent flow of the exhaust caused by the protrusion as described above. Later, turbulence occurs in the mixture of exhaust and combustion gases due to the bent portion of the inlet tube. As a result, even in this case, the mixing of the exhaust gas and the combustion gas is further promoted.

  As described above, according to the device of the present invention, in the exhaust purification device that raises the temperature of the exhaust gas by mixing the high-temperature combustion gas supplied from the combustor with the exhaust gas flowing through the exhaust passage, poor ignition and misfire in the combustor. The combustion gas and the exhaust gas can be mixed as a whole and uniformly while reducing such problems. As a result, in the device according to the present invention, the harmful substances (PM and NOx) contained in the exhaust gas discharged from the internal combustion engine are more effectively removed and the exhaust gas is more reliably purified as compared with the exhaust gas purification device according to the prior art. can do.

  Further, as described above, by projecting the protruding portion into the inside of the introduction pipe in the outer bent region or the outer upstream region, or by making an acute angle where the combustion gas direction and the exhaust direction enter a predetermined range, Mixing of the combustion gas and the exhaust gas can be further promoted.

  Furthermore, as described above, by making the sectional area in the vicinity of the opening smaller than the sectional area in the upstream of the opening, the flow velocity of the exhaust in the vicinity of the opening can be increased. As a result, the pressure in the vicinity of the opening is reduced by the venturi effect, and the supply of the combustion gas to the inside of the introduction pipe through the opening is promoted (suction effect).

  In addition, by further providing the resistance member as described above, it is possible to further reduce the possibility that the influence of the exhaust pressure fluctuation due to, for example, the output fluctuation of the internal combustion engine reaches the combustion chamber. When a slit, convergent nozzle, orifice or contraction pipe is used as the resistance member, the flow velocity of the combustion gas supplied to the inside of the introduction pipe through the opening increases, so the pressure in the vicinity of the opening decreases due to the venturi effect. The supply of combustion gas to the inside of the introduction pipe through the opening is promoted (suction effect).

  Further, as described above, the device of the present invention may include exhaust purification means including a reduction catalyst that reduces harmful substances by a reduction reaction with a reducing agent. In this case, as described above, the heat sink that is attached to the protrusion of the combustor so as to be able to conduct heat is provided in the middle of the supply path of the reducing agent to the reduction catalyst, thereby promoting the evaporation of the reducing agent, and reducing the reducing agent early. Can be vaporized. As a result, it is possible to promote removal of harmful substances by reduction catalyst.

  Further, as described above, by providing at least one bent portion in the projecting portion, for example, the influence of the exhaust gas pressure fluctuation due to the output fluctuation of the internal combustion engine reaches the combustion chamber, and the ignition failure and misfire of the fuel in the combustion chamber. The possibility of leading to such a problem can be reduced. In this case, as described above, the bent portion of the protruding portion is formed at the tip of the protruding portion, and the flow of the combustion gas supplied into the introduction pipe through the opening follows the flow of the exhaust around the opening (in parallel). With this configuration, it is possible to further reduce the possibility that the influence of the pressure fluctuation of the exhaust gas, for example, due to the fluctuation in the output of the internal combustion engine, etc. reaches the combustion chamber.

  Other objects, other features, and attendant advantages of the present invention will be readily understood from the description of each embodiment of the present invention described with reference to the following drawings.

It is a schematic diagram for demonstrating the structure of the exhaust gas purification apparatus (1st apparatus) which concerns on 1st Embodiment of this invention. It is a schematic diagram for demonstrating the structure of the modification of the combustor with which a 1st apparatus is provided. It is a schematic diagram for demonstrating the structure of the exhaust gas purification apparatus (2nd apparatus) which concerns on 2nd Embodiment of this invention. It is a schematic diagram for demonstrating the modification regarding arrangement | positioning of the combustor with which a 2nd apparatus is provided. It is a schematic diagram for demonstrating the structure of the exhaust gas purification apparatus (3rd apparatus) which concerns on 3rd Embodiment of this invention. It is a schematic diagram for demonstrating the structure of the exhaust gas purification apparatus (4th apparatus) which concerns on 4th Embodiment of this invention. It is a schematic diagram for demonstrating the structure of the exhaust gas purification apparatus (5th apparatus) which concerns on 5th Embodiment of this invention. It is a schematic diagram for demonstrating the structure of the modification of a 5th apparatus. It is a schematic diagram for demonstrating the structure of the exhaust gas purification apparatus (6th apparatus) which concerns on 6th Embodiment of this invention. It is a schematic diagram for demonstrating the structure of the exhaust gas purification apparatus (7th apparatus) which concerns on 7th Embodiment of this invention.

<< First Embodiment >>
Hereinafter, an exhaust emission control device according to a first embodiment of the present invention (hereinafter sometimes referred to as a “first device”) will be described with reference to the drawings. In the following description, “upstream side” refers to the internal combustion engine side in the exhaust passage, and “downstream side” refers to the opposite side of the exhaust passage from the internal combustion engine.

<Constitution>
As shown in FIG. 1A, the first device 101 includes an exhaust purification unit 110 that reduces harmful substances contained in exhaust from the internal combustion engine 200, and an introduction pipe 120 that guides exhaust to the exhaust purification unit 110. , A discharge pipe 130 for discharging exhaust gas from the exhaust purification means 110, and a combustor 140 for supplying combustion gas to the inside of the introduction pipe 120.

  The exhaust purification unit 110 has an exhaust purification member 111 corresponding to the type of harmful substance to be removed from the exhaust. For example, when soot particulates (PM) are assumed as harmful substances, a diesel particulate filter (DPF) can be employed as the exhaust purification member 111. In this case, the DPF may include a diesel oxidation catalyst (DOC: Diesel Oxidation Catalyst) on the upstream side.

  When nitrogen oxide (NOx) is assumed as a harmful substance, for example, a NOx reduction catalyst such as a medium reduction denitration device (SCR: Selective Catalytic Reduction) can be employed as the exhaust purification member 111. In this case, the NOx reduction catalyst may include a device (for example, a reducing agent injection device or the like) that supplies a reducing agent (for example, urea or the like) on the upstream side thereof.

  Furthermore, when trying to remove harmful substances other than PM and NOx from the exhaust, an exhaust purification member 111 other than the above can be employed according to the harmful substances. As a matter of course, the exhaust purification unit 110 may include a combination of two or more of the above-described various exhaust purification members 111 (for example, both DPF and NOx reduction catalyst).

  The combustor 140 has a combustion chamber (not shown) that generates combustion gas by combustion of fuel, and a protrusion 142 that communicates with the combustion chamber and has an opening 141 at the tip. As shown in a portion surrounded by a broken-line circle in FIG. 1A, the protrusion 142 protrudes into the introduction pipe 120. The combustor 140 is configured to supply combustion gas into the introduction pipe 120 through the opening 141. Further, an acute angle is formed between the combustion gas direction in which the combustion gas flows from the combustion chamber to the opening 141 in the combustor 140 and the exhaust direction in which the exhaust gas flows in the upstream region 122.

  Specifically, for example, fuel and air are supplied to the combustion chamber by a fuel supply device and an air supply device (not shown), and the fuel is ignited by an ignition device (for example, a glow plug) (not shown). Burn. As a result, the high-temperature combustion gas generated by the combustion of the fuel is guided from the combustion chamber to the inside of the protrusion 142 due to, for example, the pressure due to the air supply pressure by the air supply device and the volume expansion accompanying the combustion. The feed pipe 120 is supplied through the opening 141.

  The materials forming the constituent elements such as the exhaust gas purification means 110, the introduction pipe 120, the exhaust pipe 130, and the combustor 140 constituting the first apparatus 101 and the structure of these constituent elements are the same as the usage environment of the first apparatus 101. In addition, it is possible to appropriately select and design in consideration of a load, a temperature, a pressure, and the like that are assumed in use conditions. However, since details of materials and structures of these components are well known to those skilled in the art, further explanation is omitted.

  The introduction tube 120 has at least one bent portion 121. The configuration (for example, the radius of curvature and shape) of the bent portion 121 can be determined as appropriate in consideration of the influence on the flow of exhaust gas discharged from the internal combustion engine 200, for example. Specifically, for example, the pressure loss generated in the exhaust due to the bent portion 121 does not substantially reduce the output performance of the internal combustion engine 200 and the disturbance is sufficient to promote the mixing of the exhaust and the combustion gas. It is desirable to define the configuration of the bent portion 121 so that a flow can be generated in the exhaust.

  In addition, the protruding portion 142 protrudes into the introduction tube 120 at the bent portion 121 or the upstream region 122 of the introduction tube 120. In this example, the protruding portion 142 protrudes into the introducing tube 120 at the bent portion 121 of the introducing tube 120 (see the portion surrounded by the broken line in the figure), but as shown in FIG. The protrusion 142 may protrude into the introduction pipe 120 in the upstream region 122 of the introduction pipe 120. In any case, the combustion gas direction in which the combustion gas flows from the combustion chamber to the opening 141 in the combustor 140 and the exhaust direction in which the exhaust gas flows in the upstream region 122 form an acute angle. ing. The upstream region 122 is a region of the introduction pipe 120 adjacent to the upstream side of the bent portion 121 (on the internal combustion engine 200 side).

  The configuration (for example, length, thickness (cross-sectional area), shape, etc.) of the protrusion 142 takes into account the influence on the flow of exhaust gas discharged from the internal combustion engine 200 and the combustion gas flowing inside the protrusion 142, for example. And can be determined as appropriate. Specifically, for example, the pressure loss caused in the exhaust gas flowing into the introduction pipe 120 due to the protrusion 142 does not substantially reduce the output performance of the internal combustion engine 200 and the inside of the protrusion 142 is burned into the combustion gas. It is desirable to define the protrusion 142 so that the gas can flow smoothly and sufficient turbulent flow can be generated in the exhaust gas to promote mixing of the exhaust gas and the combustion gas.

<Operation>
Hereinafter, the operation of the first device 101 will be described. As indicated by the broken arrow GAS1 in FIG. 1, during the period in which the internal combustion engine 200 is operating, the exhaust discharged from the internal combustion engine 200 is an exhaust pipe 210 and an introduction pipe 120 (or these are integrally formed. Member) and is led to the exhaust purification means 110. In the exhaust purification unit 110, for example, PM is collected by the DPF, or NOx is reduced by the NOx reduction catalyst, thereby removing harmful substances contained in the exhaust and purifying the exhaust. The exhaust gas purified in this way is discharged from the exhaust gas purification means 110 as indicated by a broken arrow GAS2, and if necessary, is sent to the atmosphere via a silencer (muffler) or the like (not shown). Released.

  As described above, when a predetermined amount or more of PM accumulates in the DPF as the internal combustion engine 200 is operated, it is necessary to burn (accumulate) the accumulated PM and recover (regenerate) the PM collection ability of the DPF. Further, when the temperature of the exhaust gas is lower than a predetermined temperature, for example, when the internal combustion engine 200 is cold started, the temperature of the NOx reduction catalyst is also low and the catalyst is not activated, so that removal by reduction of NOx becomes difficult. Therefore, even in such a case, in order to remove NOx contained in the exhaust gas, it is necessary to raise the temperature of the catalyst to a temperature sufficient to activate the NOx reduction catalyst.

  Therefore, in the above situation, a control device (not shown) supplies fuel and air to the combustion chamber of the combustor 140 by a fuel supply device and an air supply device (not shown), and ignites the fuel by an ignition device (not shown), Fuel is burned in the combustion chamber. As a result, the high-temperature combustion gas generated by the combustion of the fuel is guided into the protrusion 142 and supplied into the introduction pipe 120 through the opening 141. Thereby, the temperature of the exhaust gas flowing into the exhaust gas purification means 110 including the DPF and / or the NOx reduction catalyst can be increased.

  However, as described above, in the exhaust gas purification apparatus according to the related art, the high-temperature combustion gas mixed into the exhaust gas flowing through the introduction pipe 120 becomes a laminar flow and is mixed with the exhaust gas flowing through the introduction pipe 120 as a whole and uniformly. It may be difficult. As a result, the temperature of the exhaust gas flowing into the exhaust gas purification means 110 becomes non-uniform. For example, NOx reduction can be achieved by increasing the chances of regenerating DPF by burning PM deposited on the DPF or by rapidly increasing the temperature of the NOx reduction catalyst. It may be difficult to activate the catalyst early.

  On the other hand, in the first device 101, a turbulent flow is generated in the exhaust gas flowing inside the introduction pipe 120 due to the protruding portion 142 protruding inside the introduction pipe 120. In addition, the combustion gas generated in the combustion chamber of the combustor 140 is supplied to the exhaust gas flowing in the introduction pipe 120 through the opening 141 formed at the tip of the protrusion 142. That is, in the first device 101, the combustion gas is mixed into the exhaust gas in which the turbulent flow is generated. Therefore, mixing of exhaust gas and combustion gas is promoted.

  In addition to the above, since the introduction pipe 120 included in the first device 101 has at least one bent portion 121, this also causes turbulence in the exhaust gas flowing through the introduction pipe 120. Accordingly, as shown in FIG. 1A, when the protruding portion 142 protrudes into the introduction tube 120 at the bent portion 121, the introduction tube 120 is bent and the protruding portion 142 is connected to the introduction tube 120. Due to both projecting into the interior of the pipe, a more pronounced turbulence occurs in the exhaust flowing through the inlet pipe 120. As a result, mixing of exhaust gas and combustion gas is further promoted.

  On the other hand, as shown in FIG. 1B, when the protruding portion 142 protrudes into the introduction pipe 120 in the upstream region 122, the exhaust turbulence caused by the protruding portion 142 causes exhaust and exhaust as described above. After the mixing with the combustion gas is promoted, a turbulent flow is generated in the mixture of the exhaust gas and the combustion gas due to the bent portion 121. As a result, even in this case, the mixing of the exhaust gas and the combustion gas is further promoted.

  Also in the first device 101, since the projecting portion 142 projects into the introduction pipe 120 so that the combustion gas direction and the exhaust direction form an acute angle as described above, the output fluctuation of the internal combustion engine 200 as described above. It is possible to reduce problems such as poor ignition and misfire in the combustor 140 due to exhaust pressure fluctuations associated with the above.

  As described above, according to the first embodiment of the present invention, the exhaust gas purification apparatus (in which the high-temperature combustion gas supplied from the combustor 140 is mixed into the exhaust gas flowing through the introduction pipe 120 to raise the temperature of the exhaust gas ( In the first apparatus 101, the combustion gas and the exhaust gas can be mixed as a whole and uniformly while reducing problems such as poor ignition and misfire in the combustor 140. As a result, in the first device 101, harmful substances (for example, PM and NOx) contained in the exhaust discharged from the internal combustion engine 200 can be more effectively removed, and the exhaust can be purified more reliably.

  In the example shown in FIG. 1A, the exhaust pipe 210 and the introduction pipe 120 of the internal combustion engine 200, which are separate members, are joined via a flange. However, such a configuration is not essential. For example, as shown in FIG. 1B, the exhaust pipe 210 and the introduction pipe 120 of the internal combustion engine 200 may be formed as an integral member.

  Further, in the example shown in FIG. 1, the combustor 140 is formed as an integral member including a combustion chamber (not shown) and the projecting portion 142. However, as shown in FIG. The member 143 including the combustion chamber and the member including the protrusion 142 may be joined via a flange. By adopting such a configuration, for example, when some trouble occurs in the combustor 140, the member 143 including the combustion chamber is separated, and for example, replacement of the combustion chamber and / or repair of the combustor 140 is performed. It can be done easily.

  Furthermore, in the example shown in FIGS. 1 and 2, the protruding portion 142 protrudes into the introduction pipe 120 in the outer bent region or the outer upstream region. As described above, the outer bent region is the region outside the bent portion 121 of the introduction tube 120 (see the black arrow shown in the figure), and the outer upstream region is the inside of the introduction tube 120. The upstream region is closer to the internal combustion engine 200 than the outer bent region along the flow direction of the flowing exhaust gas.

  However, for example, even when the protruding portion 142 protrudes into the introduction pipe 120 in the region inside the bent portion 121 (see the white arrow shown in the drawing) or the upstream region located on the upstream side thereof, The various effects described above for the first device 101 can be achieved. That is, the position where the protrusion 142 protrudes into the introduction tube 120 is not limited to the above.

  However, when the protruding portion 142 protrudes into the introduction pipe 120 in the outer bent region or the outer upstream region as in the example illustrated in FIGS. 1 and 2, the various effects described above for the first device 101 are further improved. It can be achieved effectively.

<< Second Embodiment >>
Hereinafter, an exhaust emission control device according to a second embodiment of the present invention (hereinafter sometimes referred to as “second device”) will be described with reference to FIGS. 3 and 4 as necessary. 3 and 4, the same reference numerals as those shown in FIGS. 1 and 2 are assigned to the same components as those shown in FIGS. 1 and 2.

<Constitution>
The configuration of the second device 102 is basically the same as the configuration of the first device 101 described above with reference to FIGS. 1 and 2. Accordingly, the combustion gas direction in which the combustion gas flows from the combustion chamber to the opening 141 in the combustor 140 and the exhaust direction in which the exhaust gas flows in the upstream region 122 form an acute angle. In the second device 102, as shown in FIG. 3, the angle (θ) formed by the combustion gas direction and the exhaust direction is 60 °.

  However, the angle θ is not particularly limited as long as the combustion gas and the exhaust gas can be mixed as a whole and uniformly while reducing problems such as poor ignition and misfire in the combustor 140. Preferably, the angle θ formed by the combustion gas direction and the exhaust direction is not less than 35 ° and not more than 85 °. By setting the angle θ to 35 ° or more, it is possible to reduce the problem that the combustion gas and the exhaust gas are not mixed with each other in a laminar flow. Further, by setting the angle θ to 85 ° or less, it is possible to reduce problems such as poor ignition and misfire in the combustor 140 due to fluctuations in exhaust pressure caused by fluctuations in output of the internal combustion engine.

  As described above, the combustion gas direction is the direction in which the combustion gas flows from the combustion chamber (not shown) to the opening 142 in the combustor 140 (see the solid line arrow in the figure). On the other hand, the exhaust direction is the direction in which the exhaust flows in the upstream region of the introduction pipe 120 (see the dashed line arrow in the figure).

<Operation>
As described above, in the second device 102, the combustion gas direction and the exhaust direction form a specific angle (θ) that falls within a predetermined range (θ = 60 ° in FIG. 3). Thereby, it is possible to reduce the problem that the combustion gas and the exhaust gas are not mixed with each other in a laminar flow as in the exhaust gas purification apparatus according to the related art. As a result, while reducing problems such as poor ignition and misfire in the combustor 140, the mixing of the combustion gas and the exhaust gas can be further promoted, and the combustion gas and the exhaust gas can be further mixed in an overall and uniform manner.

  In addition, the protrusion 142 of the combustor 140 with respect to a plane including the central axis of the upstream region 122 of the introduction pipe 120 and the central axis of the bent portion 121 (hereinafter may be referred to as “introduction pipe plane”). The central axis of each need not necessarily be in the same plane.

  4 shows the introduction of the second device 102 shown in FIG. 3 when viewed from the left side of the drawing along the direction parallel to the plane of the introduction pipe (indicated by the white arrow A in the figure). 4 is a schematic diagram showing a relative positional relationship between a pipe 120 and a combustor 140. FIG. A broken straight line P shown in FIG. 4 represents an introduction pipe plane (a plane including the central axis of the upstream region 122 of the introduction pipe 120 and the central axis of the bent portion 121).

  For example, as shown in FIG. 4A, the central axis of the protrusion 142 of the combustor 140 may coincide with the introduction pipe plane P as in the combustor 140 drawn by a solid line in the drawing. Alternatively, it does not have to coincide with the introduction pipe plane P as in the combustor 140 drawn by the one-dot chain line and the two-dot chain line. Further, as shown in FIG. 4B, the central axis of the protrusion 142 of the combustor 140 may coincide with the introduction pipe plane P as in the combustor 140 drawn by a solid line in the drawing. Or you may incline with respect to the introductory pipe plane P like the combustor 140 drawn with the dashed-dotted line and the dashed-two dotted line.

<< Third Embodiment >>
Hereinafter, an exhaust emission control device according to a third embodiment of the present invention (hereinafter sometimes referred to as “third device”) will be described with reference to FIG. 5 as necessary. Also in FIG. 5, the same reference numerals as those shown in FIGS. 1 to 4 are given to the same components as those shown in FIGS.

<Constitution>
As described above, in the exhaust gas purification apparatus according to the present invention, since the protrusion of the combustor protrudes into the introduction pipe in the bent portion or the upstream region of the introduction pipe, the turbulent flow in the exhaust flowing through the introduction pipe And the mixing of the exhaust gas and the combustion gas is promoted. In addition to this, in the region where the protruding portion protrudes inside the introduction pipe, the cross-sectional area of the introduction pipe through which the exhaust can flow is reduced by the protrusion of the protruding portion. As a result, the flow velocity of the exhaust gas flowing through the region increases, the pressure in the region decreases due to the venturi effect, and the supply of combustion gas to the inside of the introduction pipe through the opening is promoted (suction effect).

  Therefore, in the third device, the cross-sectional area of the introduction pipe through which the exhaust can flow in the region is further reduced, and the flow velocity of the exhaust flowing through the region is further increased, so that the suction effect is further enhanced, and the opening portion Further, the supply of the combustion gas to the inside of the introduction pipe through the gas is further promoted.

  As shown in FIG. 5A, the configuration of the third device 103 is basically the same as the configuration of the first device 101 and / or the second device 102 described above with reference to FIGS. It is. However, in the third device 103, as shown in (b), which is an enlarged view of a portion B surrounded by a dashed ellipse in (a), the cross-sectional area (D) of the introduction pipe 120 in the vicinity of the opening 141 is shown. ) Is smaller than the cross-sectional area (C) of the introduction pipe 120 on the immediate upstream side.

  Specifically, in the third device 103, the opening vicinity sectional area is smaller than the opening upstream sectional area. As described above, the cross-sectional area in the vicinity of the opening is a cross-sectional area of the introduction pipe 120 by at least one of the cross sections that intersect with the opening 141 and are orthogonal to the central axis of the introduction pipe 120. On the other hand, the opening upstream cross-sectional area is orthogonal to the central axis of the introduction pipe 120 in the region of the introduction pipe 120 adjacent to the internal combustion engine 200 side (upstream side) of the region where the protrusion 142 projects into the introduction pipe 120. It is a cross-sectional area of the introduction pipe 120 according to the cross section.

  In the example shown in FIG. 5, the protruding portion 142 protrudes into the introduction tube 120 at the bent portion 121. Therefore, the “cross-sectional area in the vicinity of the opening” corresponds to the cross-sectional area D of the bent portion 121 formed by at least one of the cross sections intersecting the opening 141 and orthogonal to the central axis Y of the bent portion 121. On the other hand, the “opening upstream cross-sectional area” corresponds to the cross-sectional area C of the introduction pipe 120 having a cross section orthogonal to the central axis X of the introduction pipe 120 in the upstream region 122. The cross-sectional area in the vicinity of the opening thus determined (“cross-sectional area D” indicated by a thick broken line) is smaller than the cross-sectional area upstream of the opening (“cross-sectional area C” indicated by a thick solid line).

  From the viewpoint of reducing the pressure loss generated in the exhaust gas flowing inside the introduction pipe 120, as shown in FIG. 5, the cross-sectional area of the introduction pipe 120 is changed from the “opening upstream cross-sectional area” to the “near the opening” It is desirable to form the introduction tube 120 so as to gradually change to “cross-sectional area”.

<Operation>
As described above, in the third device 103, the opening vicinity cross-sectional area (cross-sectional area D in FIG. 5) is smaller than the opening upstream cross-sectional area (cross-sectional area C in FIG. 5). Thereby, the suction effect can be further enhanced by further increasing the flow rate of the exhaust gas flowing in the vicinity of the opening 141, and the supply of the combustion gas to the inside of the introduction pipe through the opening can be further promoted.

  In the example shown in FIG. 5, the protruding portion 142 protrudes into the introduction pipe 120 at the bent portion 121, and the opening upstream sectional area is a section perpendicular to the central axis X of the introduction pipe 120 in the upstream region 122. This corresponds to the cross-sectional area C of the introduction pipe 120. However, for example, when a region corresponding to a region upstream of the region that is included in the bent portion 121 and the protruding portion 142 protrudes into the introduction tube 120 exists in the bent portion 121, the region The cross-sectional area of the introduction pipe 120 may be larger than the cross-sectional area near the opening.

  Further, in the example shown in FIG. 5, the protruding portion 142 protrudes into the introduction pipe 120 at the bent portion 121. However, as described above, in the exhaust purification apparatus according to the present invention, the protruding portion 142 is located in the upstream region. In 122, it may protrude into the introduction pipe 120. In this case, the “cross-sectional area in the vicinity of the opening” corresponds to the cross-sectional area of the upstream region 122 by at least one of the cross-sections intersecting the opening 141 and orthogonal to the central axis of the upstream region 122. On the other hand, the “opening upstream sectional area” is introduced by a cross section orthogonal to the central axis of the introduction pipe 120 in the area of the introduction pipe 120 adjacent to the upstream side of the area where the protrusion 142 projects into the upstream area 122. This corresponds to the cross-sectional area of the tube 120.

  Even in the above case, the sectional area in the vicinity of the opening is made smaller than the sectional area in the upstream of the opening, thereby further increasing the flow velocity of the exhaust gas flowing in the vicinity of the opening 141, thereby further enhancing the suction effect and introducing through the opening. The supply of combustion gas to the inside of the tube can be further promoted.

<< 4th Embodiment >>
Hereinafter, an exhaust emission control device according to a fourth embodiment of the present invention (hereinafter sometimes referred to as “fourth device”) will be described with reference to FIG. 6. In FIG. 6, the same components as those shown in FIGS. 1 to 5 are denoted by the same reference numerals as those shown in FIGS.

<Constitution>
As described above, in the exhaust emission control apparatus according to the present invention including the first device 101 to the third device 103, the protruding portion 142 of the combustor 140 is connected to the introduction pipe 120 in the bent portion 121 or the upstream region 122 of the introduction pipe 120. 120 protrudes into the interior. Therefore, problems such as ignition failure and misfire in the combustor 140 due to the pressure fluctuation of the exhaust gas accompanying the output fluctuation of the internal combustion engine 200 as described above can be reduced.

  In the fourth device, by further providing a member for reducing the possibility that the influence of the exhaust pressure fluctuation caused by the fluctuation in the output of the internal combustion engine 200 reaches the combustion chamber 140, poor ignition and misfire in the combustor 140, etc. To reduce the problem more reliably.

  As shown in FIG. 6A, the configuration of the fourth device 104 is basically the same as the configuration of the first device 101 to the third device 103 described above with reference to FIGS. . However, the fourth device 104 further includes a resistance member 144 that is a member having a structure that prevents the flow of the combustion gas supplied into the introduction pipe 120 through the opening 141 and causes pressure loss. In this example, the resistance member 144 is a slit, and when the opening 141 is observed from the direction of the arrow shown in FIG. 6A, the shape of the opening 141 is a slit as shown in FIG. It is in the shape.

<Operation>
As described above, in the fourth device 104, a slit is employed as the resistance member 144, and the shape of the opening 141 is a slit. As a result, the flow of the combustion gas supplied to the inside of the introduction pipe 120 through the opening 141 is hindered to cause a pressure loss, and the influence of the pressure variation of the exhaust gas accompanying the variation in the output of the internal combustion engine 200 is caused in the combustion chamber 140. The possibility of reaching is reduced. As a result, problems such as poor ignition and misfire in the combustor 140 can be more reliably reduced.

  In the example shown in FIG. 6B, a slit is employed as the resistance member 144. However, the resistance member 144 is not particularly limited as long as it is a member having a structure that prevents the flow of the combustion gas supplied into the introduction pipe 120 through the opening 141 and causes pressure loss. For example, the resistance member 144 includes the slit shown in FIG. 6B and the convergent nozzle, orifice, contraction tube, punching plate, mesh plate, and louver shown in FIGS. 6C to 6H. It may be at least one member selected from the group. FIGS. 6C to 6H are schematic cross-sectional views including a cross section including the central axis of the protruding portion 142 of each resistance member 144.

  In particular, when a slit, a convergent nozzle, an orifice, or a contraction tube is employed as the resistance member 144, the flow rate of the combustion gas supplied into the introduction tube 120 through the opening 141 is increased. Therefore, the pressure in the vicinity of the opening 141 is reduced by the venturi effect, and the supply of the combustion gas to the inside of the introduction pipe 120 through the opening 141 is promoted (sucking effect).

<< 5th Embodiment >>
Hereinafter, an exhaust emission control device according to a fifth embodiment of the present invention (hereinafter may be referred to as a “fifth device”) will be described with reference to FIG. 7. Also in FIG. 7, the same reference numerals as those shown in FIGS. 1 to 6 are given to the same components as those shown in FIGS.

<Constitution>
As described above, for example, when nitrogen oxide (NOx) is assumed as a harmful substance, the exhaust purification unit 110 can employ a NOx reduction catalyst such as SCR as the exhaust purification member 111. In this case, the NOx reduction catalyst needs to be provided with a device (for example, a reducing agent injection device or the like) for supplying a reducing agent (for example, urea or the like) upstream thereof.

  As shown in FIGS. 7A and 7B, the configuration of the fifth device 105 is basically the configuration of the first device 101 to the fourth device 104 described above with reference to FIGS. It is the same. However, in the fifth device 105, the exhaust purification unit 110 includes a reduction catalyst that reduces the harmful substances by a reduction reaction with a reducing agent as the exhaust purification member 111. Specific examples of such a reduction catalyst include a NOx reduction catalyst such as SCR. Specific examples of the reducing agent include urea.

  In addition to the above, the fifth device 105 further includes a reducing agent injection means 150 that injects a reducing agent into the introduction pipe 120 at a location closer to the internal combustion engine 200 than the protruding portion 142 (upstream side). The reducing agent injection unit 150 is configured to be supplied with a reducing agent from, for example, a reducing agent storage unit, and to inject the reducing agent into the introduction pipe 120 through an injection nozzle by a pressurizing unit such as a pressurizing pump. ing. The operation of the reducing agent injection unit 150 can also be controlled by the control device described above.

<Operation>
As described above, in the fifth device 105, the exhaust purification unit 110 includes the reduction catalyst that reduces harmful substances by the reduction reaction with the reducing agent, and the reducing agent injection unit 150 that injects the reducing agent into the introduction pipe 120. However, it is disposed at a location closer to the internal combustion engine 200 than the protrusion 142. Therefore, according to the fifth device 105, exhaust gas discharged from the internal combustion engine 200 can be purified by removing harmful substances such as NOx by a reduction reaction.

  Also in the fifth device 105, as described above, the exhaust gas flowing through the introduction pipe 120 can be mixed with the high-temperature combustion gas supplied from the combustor 140 to raise the temperature of the exhaust gas. Even at the time of cold start or the like, the temperature of the NOx reduction catalyst can be quickly raised to activate the NOx reduction catalyst at an early stage. As a result, NOx contained in the exhaust discharged from the internal combustion engine can be effectively removed and the exhaust can be purified.

  Further, in the fifth device 105 as well, the combustion gas and the exhaust can be mixed as a whole and uniformly. Therefore, the reducing agent injected into the introduction pipe 120 from the reducing agent injection means 150 can also be mixed with the combustion gas and the exhaust gas in an overall and uniform manner. As a result, vaporization of the reducing agent is promoted, the reducing agent is uniformly supplied to the NOx reduction catalyst, NOx is more effectively removed by the reduction reaction, and exhaust gas can be purified more reliably.

  In the example shown in FIGS. 7A and 7B, the exhaust pipe 210 and the introduction pipe 120 of the internal combustion engine 200, which are separate members, are joined via a flange, and the reducing agent injection is performed. The means 150 is arranged on the upstream side (a) or the downstream side (b) of the flange. However, such a configuration is not essential. For example, when the exhaust pipe 210 and the introduction pipe 120 of the internal combustion engine 200 are formed as an integral member as shown in FIG. The reducing agent injection means 150 may be disposed in the formed introduction pipe 120 (exhaust pipe 210).

<< 6th Embodiment >>
Hereinafter, an exhaust emission control device (hereinafter, may be referred to as “sixth device”) according to a sixth embodiment of the present invention will be described with reference to FIG. 9. 9, the same reference numerals as those shown in FIGS. 1 to 8 are given to the same components as those shown in FIGS. 1 to 8.

<Constitution>
In order to remove the NOx more effectively through the reduction reaction by mixing the reducing agent with the combustion gas and the exhaust gas in an overall and uniform manner, evaporation of the reducing agent injected from the reducing agent injection means 150 into the introduction pipe 120 is performed. It is desirable to promote and vaporize the reducing agent early.

  As shown in FIG. 9, the configuration of the sixth device 106 is basically the same as the configuration of the fifth device 105 described above with reference to FIGS. 7 and 8. However, the sixth device 106 further includes a heat radiating plate 160 attached to the protrusion 142 so as to be able to conduct heat in a region between the reducing agent injection means 150 and the exhaust purification means 110 inside the introduction pipe 120.

  The material, structure, and the like that form the heat sink 160 can be appropriately selected and designed in consideration of the load, temperature, and the like that are assumed in the use environment and use conditions of the sixth device 106. However, it is not desirable from the viewpoint of maintaining the output performance of the internal combustion engine 200 to cause excessive pressure loss in the exhaust gas flowing inside the introduction pipe 120. Therefore, it is desirable that the heat dissipation plate 160 be at least one member selected from the group consisting of a punching plate and a mesh plate. As shown in FIG. 9B, the heat radiating plate 160 provided in the sixth device 106 is a punching plate.

<Operation>
As described above, in the sixth device 106, the heat radiating plate 160 made of a punching plate can conduct heat with the protrusion 142 in the region between the reducing agent injection means 150 and the exhaust purification means 110 inside the introduction pipe 120. Is attached. Accordingly, the protrusion 142 is heated by the high-temperature combustion gas as the combustor 140 is operated, and the heat radiating plate 160 is heated by heat conduction from the protrusion 142.

  The exhaust gas and the reducing agent flowing inside the introduction pipe 120 are heated by the radiant heat from the heat radiating plate 160 configured as described above. In addition, at least a part of the reducing agent that has reached the heat radiating plate 160 without evaporating out of the reducing agent injected into the introduction pipe 120 from the reducing agent injection means 150 comes into contact with the heat radiating plate 160, whereby the heat radiating plate 160. Heats directly and promotes evaporation. That is, according to the sixth device 106, early vaporization of the reducing agent is promoted. As a result, the reducing agent is further and uniformly mixed with the combustion gas and the exhaust gas, and NOx contained in the exhaust gas is more effectively removed by, for example, the reduction reaction in the NOx reduction catalyst.

<< 7th Embodiment >>
Hereinafter, an exhaust emission control device according to a seventh embodiment of the present invention (hereinafter may be referred to as a “seventh device”) will be described with reference to FIG. 10. In FIG. 10, the same components as those shown in FIGS. 1 to 9 are denoted by the same reference numerals as those shown in FIGS.

<Constitution>
As described above, in order to reduce problems such as poor ignition of fuel and misfire in the combustion chamber, it is necessary to reduce the influence of fluctuations in the pressure of exhaust gas, for example, due to fluctuations in the output of the internal combustion engine, to the combustion chamber. There is. The fourth device 104 described above further includes a resistance member 144 that is a member having a structure that prevents the flow of the combustion gas supplied to the inside of the introduction pipe 120 through the opening 141 to cause a pressure loss, thereby providing exhaust gas. Reduced the effect of pressure fluctuations to the combustion chamber.

  On the other hand, in the seventh device, by providing at least one bent portion 145 on the projecting portion 142, it is possible to reduce the influence of the pressure fluctuation of the exhaust gas to the combustion chamber of the combustor 140. As shown in FIG. 10, the configuration of the seventh device 107 is basically the same as the configuration of the first device 101 to the sixth device 106 described above with reference to FIGS. However, in the seventh device, the projecting portion 142 has one bent portion 145 (see the portion surrounded by the broken line in the figure).

  The configuration (for example, the radius of curvature and shape) of the bent portion 145 formed in the protruding portion 142 is appropriately determined in consideration of the influence on the flow of the combustion gas from the combustion chamber of the combustor 140 toward the opening 141, for example. be able to. Specifically, for example, the pressure loss generated in the combustion gas due to the bent portion 145 does not substantially reduce the heating effect of the exhaust by the combustor 140 and the influence of the exhaust pressure fluctuation reaches the combustion chamber. It is desirable to determine the configuration of the bent portion 145 so that a sufficient drag force (resistance) can be generated.

  Note that the position of the bent portion 145 formed on the projecting portion 142 is not particularly limited as long as it is possible to reduce the influence of the pressure fluctuation of the exhaust gas to the combustion chamber. Therefore, the bent portion 145 may be formed at the tip of the protruding portion 142. In this case, the opening 141 is formed at the tip of the bent portion 145 of the protruding portion 142 on the side opposite to the combustion chamber.

<Operation>
As described above, in the seventh device 107, by providing at least one bent portion 145 on the projecting portion 142, for example, the influence of the exhaust pressure fluctuation due to the output fluctuation of the internal combustion engine 200 or the like is affected by the combustion chamber of the combustor 140. To reduce up to As a result, according to the seventh device 107, problems such as poor ignition of fuel and misfire in the combustion chamber can be reduced more effectively.

  In the seventh device 107, the bent portion 145 of the projecting portion 142 is such that the flow direction of the combustion gas supplied into the introduction pipe 120 through the opening 141 is the exhaust gas around the opening 141 inside the introduction pipe 120. It can be configured to be parallel to the flow direction. In this case, since the opening 141 faces the downstream side of the introduction pipe 120, it is possible to further reduce the possibility that the influence of the pressure fluctuation of the exhaust gas accompanying the output fluctuation of the internal combustion engine 200 reaches the combustion chamber, for example. it can.

  However, in the above case, the flow of the combustion gas supplied to the inside of the introduction pipe 120 through the opening 141 is along (parallel to) the flow of the exhaust around the opening 141. Therefore, as described above with respect to the first device 101 and the second device 102, the effect of further promoting the mixing of the combustion gas and the exhaust gas is reduced to some extent by forming an acute angle between the combustion gas direction and the exhaust gas direction. However, according to the exhaust emission control device of the present invention, the protrusion 142 of the combustor 140 protrudes into the introduction pipe 120 and the introduction pipe 120 has at least one bent portion 121, so that the exhaust and combustion can be performed. Mixing with gas is effectively promoted. Therefore, as a whole, the possibility of the influence of exhaust pressure fluctuation reaching the combustion chamber is reduced, and problems such as poor ignition and misfire in the combustor 140 are reduced, and mixing of exhaust gas and combustion gas is promoted. Thus, the combustion gas and the exhaust gas can be mixed as a whole and uniformly.

  Furthermore, since the flow of the combustion gas supplied into the introduction pipe 120 through the opening 141 follows (becomes parallel to) the flow of exhaust around the opening 141, it is brought into the introduction pipe through the opening by the venturi effect. The combustion gas supply is promoted (suction effect).

  As shown in FIG. 10B, the seventh device 107 is also a member having a structure that prevents the flow of combustion gas supplied to the inside of the introduction pipe 120 through the opening 141 and causes pressure loss. A resistance member 144 may be further provided. In particular, when a slit, a convergent nozzle, an orifice, or a contraction tube is employed as the resistance member 144, the flow rate of the combustion gas supplied into the introduction tube 120 through the opening 141 is increased. Therefore, when the flow of the combustion gas supplied to the inside of the introduction pipe 120 through the opening 141 as described above follows (becomes parallel to) the flow of exhaust around the opening 141, coupled with the venturi effect by the resistance member 144. Further, the supply of the combustion gas to the inside of the introduction pipe 120 through the opening 141 is further promoted.

  In the foregoing, for the purpose of illustrating the present invention, several embodiments and modifications having specific configurations have been described with reference to the accompanying drawings. However, the scope of the present invention should not be construed as being limited to these exemplary embodiments and modifications, and modifications may be made as appropriate within the scope of the claims and the matters described in the specification. Needless to say, it can be added.

  DESCRIPTION OF SYMBOLS 101, 102, 103, 104, 105, 106 and 107 ... Exhaust gas purification device, 111 ... Exhaust gas purification means, 120 ... Introduction pipe, 121 ... Bending part (introduction pipe), 122 ... Upstream area, 130 ... Exhaust pipe, 140 ... Combustor 141 ... Opening part 142 ... Protrusion part 143 ... Member including combustion chamber 144 ... Resistance member 145 ... Bent part (protrusion part) 150 ... Reducing agent injection means 160 ... Heat sink 200 ... Internal combustion Engine, and 210 ... exhaust pipe.

Claims (13)

By exhaust gas purification means for reducing harmful substances contained in exhaust gas from an internal combustion engine, an introduction pipe for guiding the exhaust gas to the exhaust gas purification means, a discharge pipe for exhausting the exhaust gas from the exhaust gas purification means, and by combustion of fuel A combustion chamber for generating combustion gas; and a combustion chamber that communicates with the combustion chamber, protrudes into the introduction pipe, and has an opening formed at a tip thereof, and passes through the opening into the introduction pipe. A combustor configured to supply gas, the combustion gas direction in which the combustion gas flows from the combustion chamber to the opening in the combustor, and the exhaust gas in the upstream region. An exhaust gas purification apparatus having an acute angle with an exhaust direction that is a flowing direction,
The introduction tube has at least one bent portion;
In the upstream region that is the region of the introduction pipe adjacent to the internal combustion engine side of the bent portion of the introduction pipe, the protruding portion protrudes into the introduction pipe at the bent portion of the introduction pipe. Projecting into the introduction tube,
Exhaust purification device. An exhaust emission control device according to claim 1,
The protruding portion protrudes into the introduction pipe in an outer bent region that is an outer region of the bent portion of the introduction pipe, or along the flow direction of the exhaust gas flowing through the introduction pipe. Projecting into the introduction pipe in the outer upstream region, which is the upstream region closer to the internal combustion engine than the outer bending region,
Exhaust purification device. An exhaust emission control device according to claim 1 or 2,
The angle formed by the combustion gas direction and the exhaust direction is 35 ° or more and 85 ° or less.
Exhaust purification device. An exhaust emission control device according to any one of claims 1 to 3,
The cross-sectional area in the vicinity of the opening, which is a cross-sectional area of the introduction pipe by at least one of the cross-sections intersecting the opening and orthogonal to the central axis of the introduction pipe, is such that the protrusion protrudes into the introduction pipe. Smaller than an opening upstream cross-sectional area that is a cross-sectional area of the introduction pipe by a cross-section perpendicular to the central axis of the introduction pipe in a region of the introduction pipe adjacent to the internal combustion engine side of the area
Exhaust purification device. An exhaust emission control device according to any one of claims 1 to 4,
The exhaust emission control device further includes a resistance member that is a member having a structure that prevents a flow of the combustion gas supplied into the introduction pipe through the opening and causes pressure loss.
Exhaust purification device. An exhaust emission control device according to claim 5, wherein
The resistance member is at least one member selected from the group consisting of a slit, a convergent nozzle, an orifice, a contraction tube, a punching plate, a mesh plate, and a louver.
Exhaust purification device. An exhaust emission control device according to claim 6,
The resistance member is at least one member selected from the group consisting of a slit, a convergent nozzle, an orifice, and a contraction tube.
Exhaust purification device. An exhaust emission control device according to any one of claims 1 to 7,
The exhaust purification means includes a reduction catalyst that reduces the harmful substances by a reduction reaction with a reducing agent,
The exhaust emission control device further includes a reducing agent injection unit that injects the reducing agent into the introduction pipe at a location closer to the internal combustion engine than the protruding portion.
Exhaust purification device. An exhaust emission control device according to claim 8,
The exhaust purification device further includes a heat radiating plate attached to the protruding portion so as to be able to conduct heat in a region between the reducing agent injection means and the exhaust purification means inside the introduction pipe.
Exhaust purification device. An exhaust emission control device according to claim 9, wherein
The heat dissipation plate is at least one member selected from the group consisting of a punching plate and a mesh plate.
Exhaust purification device. An exhaust emission control device according to any one of claims 1 to 10,
The protrusion has at least one bent portion,
Exhaust purification device. An exhaust emission control device according to claim 11,
The bent portion of the protruding portion is formed at the tip of the protruding portion,
The opening is formed at a tip of the protruding portion on the side opposite to the combustion chamber of the bent portion.
Exhaust purification device. An exhaust emission control device according to claim 12,
In the bent portion of the protrusion, the flow direction of the combustion gas supplied into the introduction pipe through the opening is parallel to the flow direction of the exhaust gas around the opening inside the introduction pipe. Configured as
Exhaust purification device.

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