JP2012167591A - Exhaust emission control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust emission control device which reduces the distribution of the temperature of an exhaust emission control member to maintain the capability thereof, thereby reducing damages to the exhaust emission control member.SOLUTION: A turning force application member 14 provided to the outer circumferential wall 31 of a combustion auxiliary member 13 applies a turning force to an exhaust emission flow which passes through a space on the outer circumferential side of the combustion auxiliary member 13. Then, the exhaust emission passing the outer circumferential side of the combustion auxiliary member 13 turns on the downstream side of the combustion auxiliary member 13 or the upstream side of the exhaust emission control member 12, to be mixed with the combustion gas generated through the combustion of an additive in the combustion auxiliary member 13. Thereby, the exhaust emission flowing into the exhaust emission control member 12 is reduced in the distribution of temperature, allowing the exhaust emission control member 12 heated with the exhaust emission to be reduced in the temperature distribution in the radial direction.

Description

  The present invention relates to an exhaust emission control device.

  In order to purify the exhaust gas of an internal combustion engine, exhaust purification members such as DPF (Diesel Particulate Filter) and DOC (Diesel Oxidation Catalyst) are used. Such an exhaust purification member requires a sufficient temperature to maintain its activity. Therefore, a combustion auxiliary member such as a combustion catalyst is provided upstream of the exhaust purification member in the exhaust flow direction in the exhaust passage (see Patent Documents 1 and 2). The combustion assisting member assists the combustion of additives such as fuel supplied from an additive supply unit provided further upstream. By burning the additive supplied from the additive supply unit in this way, the temperature of the exhaust flowing through the exhaust passage rises, and the exhaust purification member is heated to a temperature that maintains the activity by the exhaust.

  However, when the heated exhaust gas is supplied to the exhaust gas purification member provided on the downstream side of the combustion assisting member, temperature variation occurs in the radial direction of the exhaust gas purification member. The combustion assisting member has a smaller diameter than the exhaust purification member in order to reduce the resistance of the exhaust gas flowing through the exhaust passage. Therefore, when the combustion assisting member is arranged near the center in the radial direction of the exhaust passage, the temperature rises near the radial center of the exhaust purification member located on this extension line, but the temperature increases outside the radial direction of the exhaust purification member. Becomes dull. As a result, the exhaust purification member has a temperature distribution in the radial direction. Thus, when temperature distribution arises in an exhaust purification member, there exists a problem of causing the fall of the capability of an exhaust purification member, or causing damage to an exhaust purification member by the thermal stress by temperature distribution.

JP 2010-59886 A JP 2010-84710 A

  Accordingly, an object of the present invention is to provide an exhaust purification device that maintains the capability of the exhaust purification member and reduces the damage to the exhaust purification member by reducing the temperature distribution of the exhaust purification member.

  In the first aspect of the present invention, the turning force applying member is provided between the exhaust pipe member that forms the exhaust passage and the combustion auxiliary member that assists the combustion of the additive. The turning force applying member applies a turning force to the flow of exhaust gas on the outer peripheral side of the combustion assisting member. Therefore, the exhaust gas that has passed through the outer peripheral side of the combustion assisting member forms a swirling flow downstream of the combustion assisting member, that is, upstream of the exhaust purification member. As a result, the exhaust gas that has passed through the outer peripheral side of the combustion assisting member and the combustion gas generated by the combustion of the additive in the combustion assisting member are mixed and then flow into the exhaust purification member. As a result, the temperature distribution of the exhaust gas flowing into the exhaust gas purification member is reduced, and the temperature distribution in the radial direction of the exhaust gas purification member heated by the exhaust gas is also reduced. Therefore, the capability of the exhaust purification member can be sufficiently maintained with a simple structure, and damage to the exhaust purification member due to temperature distribution can be reduced.

  According to the first aspect of the present invention, the exhaust gas passing through the outer peripheral side and the combustion gas generated by the combustion are easily mixed by applying a turning force to the exhaust gas passing through the outer peripheral side of the combustion assisting member. . That is, the distance to be secured between the combustion assisting member and the exhaust purification member is reduced for mixing the exhaust. Therefore, the combustion assisting member and the exhaust purification member are disposed close to each other, so that the exhaust passage is not extended and the exhaust pipe member is not enlarged. Therefore, it is possible to reduce the temperature distribution of the exhaust purification member while reducing the size.

  In the invention according to claim 2, the auxiliary ring member supports the combustion auxiliary member radially inside, and has a turning force applying member between the inner peripheral wall and the combustion auxiliary member. Thereby, the combustion auxiliary member and the turning force applying member are unitized separately from the exhaust pipe member together with the auxiliary ring member. Therefore, the combustion auxiliary member and the turning force imparting member can be easily attached to the exhaust pipe member. Therefore, handling and attachment can be facilitated.

  In the invention of claim 3, the turning force applying member is fixed to a member facing the end portion on the outer peripheral side in the radial direction of the exhaust pipe member. When the outer peripheral end of the turning force applying member faces the exhaust pipe member, the outer peripheral end is fixed to the exhaust pipe member. Further, when the outer peripheral end of the turning force applying member faces the auxiliary ring member, the outer peripheral end is fixed to the auxiliary ring member. On the other hand, the turning force applying member is fixed to the combustion assisting member at the inner peripheral end in the radial direction of the exhaust pipe member. Thereby, the turning force imparting member connects the exhaust pipe member or the auxiliary ring member and the combustion auxiliary member. That is, the turning force imparting member supports the combustion auxiliary member as a support member on the inner peripheral side of the exhaust pipe member or the auxiliary ring member. As a result, the number of members provided between the combustion auxiliary member and the exhaust pipe member or auxiliary ring member on the outer peripheral side of the combustion auxiliary member is reduced. Therefore, the exhaust resistance on the outer peripheral side of the combustion assisting member can be reduced.

  In the invention described in claim 4, the turning force applying member is formed of an elastically deformable material, that is, a material functioning as a “spring”. Since the combustion assisting member is provided in the exhaust passage, it vibrates together with the internal combustion engine. Moreover, since the temperature of the combustion assisting member changes in a wide range, the combustion assisting member repeats expansion and contraction. When vibration and expansion or contraction are repeated in this way, stress is applied to the connecting portions at both ends in the radial direction of the turning force applying member. By forming the turning force applying member from a material that can be elastically deformed, the stress applied to the connecting portions at both ends of the turning force applying member is alleviated. Therefore, the reliability in the connection part of the turning force provision member which supports a combustion auxiliary member can be improved.

  In the invention according to claim 5, the turning force applying member forms a gap between the radially inner peripheral side and the combustion auxiliary member. That is, the turning force imparting member is not in contact with the combustion assisting member. Therefore, the degree of freedom in design of the turning force applying member is improved without being affected by the combustion assisting member. Therefore, the ability to form a swirling flow can be increased, so that the temperature distribution of the exhaust purification member can be reduced, and the reliability can be improved.

The schematic diagram which shows the structure of the exhaust gas purification apparatus by 1st Embodiment. The fragmentary sectional view which shows the principal part of the exhaust gas purification apparatus by 1st Embodiment Sectional drawing which shows the cross section in the III-III line of FIG. The figure equivalent to FIG. 2 of the exhaust emission control device by 2nd Embodiment Sectional drawing which shows the cross section in the VV line of FIG. The figure equivalent to FIG. 2 of the exhaust emission control device by 3rd Embodiment Sectional drawing which shows the cross section in the VII-VII line of FIG. Sectional drawing equivalent to FIG. 3 of the exhaust gas purification device by 4th Embodiment Schematic perspective view showing an exhaust emission control device according to a fifth embodiment

Hereinafter, a plurality of embodiments of an exhaust emission control device will be described based on the drawings. Note that, in a plurality of embodiments, substantially the same components are denoted by the same reference numerals, and description thereof is omitted.
(First embodiment)
As shown in FIG. 1, the exhaust purification device 10 according to the first embodiment includes an exhaust pipe member 11, an exhaust purification member 12, a combustion auxiliary member 13, and a turning force applying member 14. The exhaust pipe member 11 forms an exhaust passage 15 inside. The exhaust passage 15 formed by the exhaust pipe member 11 has one end connected to the internal combustion engine 16 and the other end open to the atmosphere. The exhaust purification member 12 and the combustion auxiliary member 13 are provided in an exhaust passage 15 formed by the exhaust pipe member 11. The exhaust passage 15 is provided with a temperature sensor 17 for detecting the temperature of the exhaust. Further, the exhaust passage 15 is provided with a turbine 22 of a supercharger 21 in the exhaust passage 15 between the internal combustion engine 16 and the exhaust purification member 12. The turbine 22 of the supercharger 21 is rotated by the exhaust of the internal combustion engine 16 that flows through the exhaust passage 15. The rotation of the turbine 22 is transmitted to a compressor (not shown) provided in an intake passage (not shown) via a shaft (not shown). Thereby, the intake air taken into the internal combustion engine 16 via the intake passage is compressed by the compressor. The internal combustion engine 16 is, for example, a diesel engine using light oil as fuel. The diesel engine is not limited to light oil, and any applicable fuel such as various alcohols, ethers, or biological oils and fats can be used. The internal combustion engine 16 is not limited to a diesel engine, and may be a gasoline engine or a gas turbine engine.

  The exhaust purification member 12 is a filter or a catalyst such as DOC or DPF. The DOC oxidizes unburned fuel contained in the exhaust, carbon monoxide generated by incomplete combustion, and the like. The DPF collects PM (Particulate Matter) contained in the exhaust gas. The DOC and DPF are formed of a porous body such as ceramics. For DOC and DPF, an active layer such as a metal may be coated on a porous carrier.

  The combustion auxiliary member 13 is provided on the upstream side of the exhaust purification member 12 in the exhaust flow direction in the exhaust passage 15, that is, on the exhaust inlet side of the exhaust purification member 12. An additive injection unit 23 is provided further upstream of the combustion assisting member 13. The additive injection unit 23 injects the fuel flowing through the exhaust passage 15 with the fuel of the internal combustion engine 16 as an additive, for example. The additive is not limited to the fuel for the internal combustion engine 16. The combustion auxiliary member 13 is a catalyst that promotes combustion of the additive injected from the additive injection unit 23. By burning the additive with the combustion auxiliary member 13, the temperature of the exhaust gas flowing into the exhaust purification member 12 rises. When the temperature of the exhaust gas is relatively high, the additive injected from the additive injection unit 23 into the exhaust burns in the combustion auxiliary member 13 and heats the exhaust flowing into the exhaust purification member 12. On the other hand, when the temperature of the exhaust gas is relatively low, the additive injected into the exhaust from the additive injection unit 23 may not burn sufficiently in the combustion auxiliary member 13. Therefore, a glow plug 24 may be provided between the additive injection unit 23 and the combustion auxiliary member 13. The glow plug 24 generates heat by electric power from a battery (not shown). Thereby, a part of the additive injected from the additive injection part 23 is ignited by the glow plug 24 and flows into the combustion assisting member 13 in a state where the temperature is raised. Thereby, the temperature of the combustion auxiliary member 13 rises, and the combustion of the additive injected from the additive injection unit 23 is promoted.

  The combustion auxiliary member 13 is supported by an exhaust passage 15 formed by the exhaust pipe member 11 by a support member 25. As shown in FIGS. 2 and 3, a plurality of support members 25 are provided radially from the combustion assisting member 13 in the circumferential direction. The support member 25 extends in the radial direction of the exhaust pipe member 11, and has one end connected to the outer peripheral wall 31 of the combustion assisting member 13 and the other end connected to the inner peripheral wall 32 of the exhaust pipe member 11. ing. Thereby, the combustion auxiliary member 13 is fixed inside the exhaust pipe member 11.

  The turning force applying member 14 is provided on the outer peripheral side of the combustion assisting member 13 so as to protrude radially outward. The combustion auxiliary member 13 has a smaller outer diameter than the inner diameter of the exhaust passage 15 so as not to hinder the flow of exhaust gas in the exhaust passage 15. That is, the combustion assisting member 13 reduces the exhaust resistance by making the outer diameter smaller than the inner diameter of the exhaust passage 15. Therefore, a gap 33 that is a part of the exhaust passage 15 is formed between the outer peripheral wall 31 of the combustion assisting member 13 and the inner peripheral wall 32 of the exhaust pipe member 11 that forms the exhaust passage 15. The turning force applying member 14 is provided in a gap 33 between the outer peripheral wall 31 of the combustion assisting member 13 and the inner peripheral wall 32 of the exhaust pipe member 11. The turning force imparting member 14 has a fin shape and is formed in a loose spiral shape in the axial direction of the combustion assisting member 13. The turning force applying member 14 is provided radially in the circumferential direction. Specifically, a plurality of turning force imparting members 14 are provided between the support members 25 in the circumferential direction of the combustion assisting member 13. The turning force applying member 14 may be formed over the entire axial length of the combustion assisting member 13, or may be formed over a part of the entire axial length of the combustion assisting member 13.

  Part of the exhaust gas flowing through the exhaust passage 15 passes through the combustion assisting member 13, and the remaining part passes through the outer peripheral side of the combustion assisting member 13, that is, through the gap 33 and flows into the exhaust purification member 12. By providing the turning assisting member 14 on the combustion assisting member 13, the exhaust gas passing through the gap 33 swirls the outer peripheral side of the combustion assisting member 13 in the circumferential direction by the turning force imparting member 14. As a result, the exhaust gas passing through the gap 33 is given a turning force around the axis of the exhaust passage 15.

  Thus, by providing the turning force imparting member 14 on the outer peripheral side of the combustion auxiliary member 13, the exhaust gas passing through the outer peripheral side of the combustion auxiliary member 13, that is, the gap 33, is given a turning force about the axis of the exhaust passage 15. Is done. For this reason, the exhaust gas passing through the outer peripheral side of the combustion assisting member 13 is disturbed in the flow on the outlet side of the combustion assisting member 13, that is, on the inlet side of the exhaust purification member 12. As a result, the exhaust gas that has passed through the combustion assisting member 13 and whose temperature has increased due to the combustion of the additive is mixed with the exhaust gas that has passed through the clearance 33 on the outer peripheral side of the combustion assisting member 13 and the inlet side of the exhaust purification member 12. Thereby, the temperature of the exhaust gas flowing into the exhaust purification member 12 is made uniform in the radial direction of the exhaust passage 15, and the temperature distribution in the radial direction of the exhaust purification member 12 becomes small.

The operation of the exhaust purification device 10 will be described.
When the exhaust gas temperature is low, such as immediately after starting the internal combustion engine 16 or during operation at a low load, the exhaust purification device 10 energizes the glow plug 24 while injecting the additive from the additive injection unit 23. At this time, the temperature of the exhaust is detected by the temperature sensor 17. Then, the exhaust purification device 10 energizes the glow plug 24 when the temperature of the exhaust is, for example, 250 ° C. or lower. Thereby, a part of the additive injected from the additive injection unit 23 is ignited by the glow plug 24 and flows into the combustion auxiliary member 13. As a result, the additive injected from the additive injection unit 23 heats the exhaust by ignition by the glow plug 24 and combustion by the combustion auxiliary member 13. The heated exhaust gas is mixed with the exhaust gas that has passed through the clearance 33 on the outer peripheral side of the combustion assisting member 13 and flows into the exhaust gas purification member 12.

On the other hand, when the temperature of the exhaust gas is relatively high, such as when the load of the internal combustion engine 16 is relatively large, the exhaust purification device 10 injects the additive from the additive injection unit 23 and energizes the glow plug 24. Stop. For example, when the temperature of the exhaust gas exceeds 250 ° C., the exhaust gas purification device 10 stops energizing the glow plug 24. Thereby, the additive injected from the additive injection part 23 is spontaneously burned by the combustion auxiliary member 13 without being ignited by the glow plug 24. Therefore, the exhaust is heated by the combustion of the additive in the combustion auxiliary member 13. The heated exhaust gas is mixed with the exhaust gas that has passed through the clearance 33 on the outer peripheral side of the combustion assisting member 13 and flows into the exhaust gas purification member 12. In this case, once combustion of the additive occurs in the combustion assisting member 13, the combustion assisting member 13 is maintained at a temperature at which activity is generated. Therefore, for example, even if the temperature of the exhaust gas flowing into the combustion auxiliary member 13 is lowered to about 150 ° C., the combustion auxiliary member 13 maintains the combustion of the additive without requiring ignition by the glow plug 24.
Further, when the exhaust gas temperature is sufficiently high, such as when the internal combustion engine 16 is operated at a high load, heating of the exhaust gas by the combustion auxiliary member 13 is unnecessary. Therefore, when the temperature of the exhaust is sufficiently high, the exhaust purification device 10 stops the injection of the additive from the additive injection unit 23.

  In the first embodiment described above, the turning force imparting member 14 imparts a turning force to the flow of exhaust gas that passes through the gap 33 on the outer peripheral side of the combustion assisting member 13. Therefore, the exhaust gas that has passed through the outer peripheral side of the combustion assisting member 13 forms a swirling flow on the downstream side of the combustion assisting member 13, that is, on the upstream side of the exhaust purification member 12. As a result, the exhaust gas that has passed through the clearance 33 on the outer peripheral side of the combustion assisting member 13 and the combustion gas generated by the combustion of the additive in the combustion assisting member 13 are mixed and then flow into the exhaust purification member 12. As a result, the temperature of the exhaust gas flowing into the exhaust gas purification member 12 becomes smaller, and the temperature distribution in the radial direction of the exhaust gas purification member 12 heated by the exhaust gas is also reduced. Therefore, the capability of the exhaust purification member 12 can be sufficiently maintained with a simple structure, and damage to the exhaust purification member 12 due to the temperature distribution can be reduced.

  In the first embodiment, the exhaust gas passing through the gap 33 and the combustion gas generated by the combustion are easily mixed by applying a turning force to the exhaust gas passing through the gap 33 on the outer peripheral side of the combustion assisting member 13. The That is, the distance to be secured between the combustion assisting member 13 and the exhaust purification member 12 is reduced for mixing the exhaust. Therefore, the combustion auxiliary member 13 and the exhaust purification member 12 can be disposed close to each other, and the extension of the exhaust passage 15 and the enlargement of the exhaust pipe member 11 are not caused. Therefore, the temperature distribution of the exhaust purification member 12 can be reduced while downsizing.

(Second Embodiment)
FIG. 4 and FIG. 5 show an exhaust emission control device according to the second embodiment.
As shown in FIGS. 4 and 5, in the case of the exhaust emission control device 10 of the second embodiment, the turning force imparting member 14 protrudes radially outward from the outer peripheral wall 31 of the combustion assisting member 13 and also has an end on the outer peripheral side. Is connected to the inner peripheral wall 32 of the exhaust pipe member 11. That is, in the radial direction of the exhaust pipe member 11, the turning force imparting member 14 has an inner peripheral end fixed to the outer peripheral wall 31 of the combustion assisting member 13, and an outer peripheral end is the inner peripheral wall of the exhaust pipe member 11. 32 is fixed. Thereby, the turning force imparting member 14 supports the combustion auxiliary member 13 inside the exhaust passage 15 formed by the exhaust pipe member 11. That is, in the case of the second embodiment, the turning force imparting member 14 also functions as a support member that supports the combustion assisting member 13.

  In 2nd Embodiment, the turning force provision member 14 is being fixed to the exhaust pipe member 11 which the edge part of an outer peripheral side opposes. Thereby, the turning force imparting member 14 supports the combustion auxiliary member 13 on the inner peripheral side of the exhaust pipe member 11 as a support member. As a result, the parts provided between the combustion auxiliary member 13 and the exhaust pipe member 11 on the outer peripheral side of the combustion auxiliary member 13 are reduced. Therefore, the exhaust gas easily passes through the gap 33 on the outer peripheral side of the combustion assisting member 13, and the resistance of the exhaust gas that passes through the gap 33 can be reduced.

(Third embodiment)
An exhaust emission control device according to the third embodiment is shown in FIGS.
As shown in FIGS. 6 and 7, in the case of the exhaust purification device 10 of the third embodiment, the turning force applying member 14 is a material that can be elastically deformed, such as a thin plate member or a leaf spring, that is, a “spring”. It is made of a material that functions as As in the second embodiment, the turning force applying member 14 is fixed to the combustion assisting member 13 and the exhaust pipe member 11 at the end in the radial direction. Therefore, the combustion assisting member 13 supported by the exhaust pipe member 11 constantly vibrates due to the operation of the internal combustion engine 16 and the change in exhaust pressure. Moreover, since the temperature of the combustion assisting member 13 provided in the exhaust passage 15 changes over a wide range, the dimensions change due to expansion and contraction. When vibration and expansion or contraction are repeated in this manner, stress is applied to both ends in the radial direction of the turning force applying member 14, that is, the connecting portions with other members.

  In the third embodiment, the turning force applying member 14 that supports the combustion assisting member 13 is formed of a material that can be elastically deformed, so that the combustion assisting member 13 and the exhaust pipe member 11 relative to each other due to vibrations or dimensional changes are relative to each other. The change in position is absorbed by the deformation of the turning force applying member 14. Therefore, the stress applied to both ends of the turning force applying member 14, that is, the connection portion between the exhaust pipe member 11 and the combustion auxiliary member 13 is relieved. Therefore, the reliability in the connection part of the turning force provision member 14 which supports the combustion auxiliary member 13 can be improved.

(Fourth embodiment)
FIG. 8 shows an exhaust emission control device according to the fourth embodiment.
As shown in FIG. 8, in the exhaust purification device 10 of the fourth embodiment, a part of the turning force imparting member 14 is connected only to the exhaust pipe member 11, and the remaining part is both the combustion auxiliary member 13 and the exhaust pipe member 11. Connected to. That is, a part of the turning force imparting member 14 is fixed only at the outer peripheral end in the radial direction of the exhaust pipe member 11 and is not fixed at the inner peripheral end. Specifically, a part of the turning force imparting member 14 is fixed to the inner peripheral wall 32 of the exhaust pipe member 11 at the outer peripheral side in the radial direction, but the inner peripheral side end in the radial direction burns. A gap is formed between the auxiliary member 13 and the outer peripheral wall 31. On the other hand, the remaining part of the turning force imparting member 14 is fixed to both the combustion assisting member 13 and the exhaust pipe member 11 also serving as a support member.

Thus, in the fourth embodiment, a part of the turning force applying member 14 is not in contact with the combustion assisting member 13. Therefore, the degree of freedom of design of the turning force applying member 14 is improved without being affected by the shape and dimensions of the combustion assisting member 13. Accordingly, the ability to form a swirl flow can be increased, so that the temperature distribution of the exhaust purification member 12 can be reduced, and the reliability can be improved.
FIG. 8 shows an example in which a part of the turning force applying member 14 forms a gap with the outer peripheral wall 31 of the combustion assisting member 13. However, it is also possible to provide a structure in which a gap is formed between the entire turning force applying member 14 and the outer peripheral wall 31 of the combustion assisting member 13 by separately providing a support member that supports the combustion assisting member 13.

(Fifth embodiment)
An exhaust emission control device according to a fifth embodiment is shown in FIG.
As shown in FIG. 9, the exhaust emission control device 10 according to the fifth embodiment includes an auxiliary ring member 51. The auxiliary ring member 51 is provided on the outer peripheral side of the combustion auxiliary member 13. The auxiliary ring member 51 supports the combustion auxiliary member 13 on the inner peripheral side. The combustion auxiliary member 13 is supported by the auxiliary ring member 51 by the turning force applying member 14 as in the fourth embodiment. That is, a part of the turning force applying member 14 is fixed to the inner peripheral wall 52 of the auxiliary ring member 51 in the radial direction of the exhaust pipe member 11, and the inner peripheral side end in the radial direction is combustion assist. A gap is formed between the outer peripheral wall 31 of the member 13. On the other hand, the remaining part of the turning force imparting member 14 is fixed to the inner peripheral wall 52 of the auxiliary ring member 51 at the outer peripheral side end in the radial direction of the exhaust pipe member 11 and at the inner peripheral side end in the radial direction. It is fixed to the outer peripheral wall 31 of the combustion auxiliary member 13. Thereby, the remaining part of the turning force application member 14 also serves as a support member. In the case of 5th Embodiment, the combustion auxiliary member 13, the turning force provision member 14, and the auxiliary | assistant ring member 51 are unitized integrally like said structure.

  In the case of the fifth embodiment, the combustion auxiliary member 13 and the turning force applying member 14 are unitized separately from the exhaust pipe member 11 together with the auxiliary ring member 51. Therefore, the combustion auxiliary member 13 and the turning force applying member 14 can be easily attached to the exhaust pipe member 11. Therefore, handling and attachment can be facilitated.

The present invention described above is not limited to the above-described embodiment, and can be applied to various embodiments without departing from the gist thereof.
For example, in the above description, each embodiment has been described individually. However, a plurality of embodiments may be applied in combination. For example, even if the exhaust purification device 10 of the first embodiment, the second embodiment, or the third embodiment is combined with the fifth embodiment, the combustion auxiliary member 13, the turning force applying member 14, and the auxiliary ring member 51 are unitized. Good. When the first embodiment is combined with the fifth embodiment, a gap is formed between the radially outer end of the turning force applying member 14 and the inner peripheral wall 52 of the auxiliary ring member 51, and the support member 25 is an auxiliary ring. The combustion auxiliary member 13 is supported on the inner peripheral side of the member 51. When the second embodiment or the third embodiment is combined with the fifth embodiment, the radially outer end of the turning force applying member 14 is fixed to the inner peripheral wall 52 of the auxiliary ring member 51. Furthermore, in the fifth embodiment, the combustion assisting member 13 may be supported on the auxiliary ring member 51 by a support member 25 that is separate from the pivoting force imparting member 14 instead of being supported by the pivoting force imparting member 14.

  In the drawings, 10 is an exhaust purification device, 11 is an exhaust pipe member, 12 is an exhaust purification member, 13 is a combustion assisting member, 14 is a turning force imparting member, 15 is an exhaust passage, 16 is an internal combustion engine, 33 is a gap, 51 is An auxiliary ring member is shown.

Claims (5)

An exhaust pipe member forming an exhaust passage of the internal combustion engine;
An exhaust purification member provided in the exhaust passage;
A combustion auxiliary member provided upstream of the exhaust purification member in the exhaust flow direction in the exhaust passage and assisting combustion of the additive added to the exhaust passage;
A turning force applying member that is provided in a gap formed between the combustion auxiliary member and the exhaust pipe member, and that applies a turning force to the exhaust flow on the outer peripheral side of the combustion auxiliary member;
An exhaust purification device comprising:   The exhaust pipe member is provided separately from the exhaust pipe member so as to be inserted into the exhaust passage, and supports the combustion auxiliary member radially inward and between the inner peripheral wall and the combustion auxiliary member. The exhaust emission control device according to claim 1, further comprising an auxiliary ring member having a turning force applying member.   The swivel force imparting member is fixed to a member facing an outer peripheral end in the radial direction of the exhaust pipe member, an inner peripheral end is fixed to the combustion assisting member, and the combustion assisting member is exhausted to the exhaust The exhaust emission control device according to claim 1 or 2, wherein the exhaust purification device is supported by a pipe member.   The exhaust purification device according to claim 3, wherein the turning force applying member is formed of an elastically deformable material.   The swirl force imparting member has an outer peripheral end fixed in a radial direction of the exhaust pipe member, and an inner peripheral end facing the combustion assisting member with a gap. The exhaust gas purification apparatus according to 1 or 2.

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