JP7251997B2 - Exhaust purification device - Google Patents

Description

The present disclosure relates to an exhaust gas purification device configured to purify exhaust gas.

As the above-described exhaust gas purification device, a configuration including a purification unit such as a catalyst for purifying exhaust gas is known. For example, Patent Literature 1 listed below proposes a technique for generating a swirling flow of exhaust gas before a purification unit.

International Publication No. WO2016/194201

However, as a result of detailed examination by the inventor, it was found that if a strong swirling flow occurs in the exhaust before the purification section, the flow rate of the exhaust gas near the center of the purification section decreases, and the purification section cannot function effectively. A problem was found.

One aspect of the present disclosure is to enable a purification section to function effectively in an exhaust gas purification device configured to purify exhaust gas.

One aspect of the present disclosure is an exhaust purification device, which includes an introduction portion, a bending portion, a connection portion, an exhaust dispersion portion, and a purification portion.
The introduction part is formed in a tubular shape, and exhaust gas is introduced thereinto. The bent portion is formed in a tubular shape and has an exhaust flow path that bends on the downstream side of the introduction portion. The connecting portion is formed in a tubular shape and has a flow channel that communicates with the flow channel at the bend on the downstream side of the bend.

The purifier is arranged in the connection and has a function of purifying exhaust gas. The exhaust dispersion unit is arranged at the bend and has a function of dispersing the flow direction of part of the exhaust in a direction different from that of the other part of the exhaust in the flow path at the bend.

According to such a configuration, the exhaust dispersing portion disperses the flow of the exhaust gas, so that the flow velocity of the exhaust gas can be suppressed when the exhaust gas bends and flows. Therefore, when the exhaust gas moves from the bent portion to the connecting portion, it is possible to suppress the generation of a strong unidirectional swirling flow. By suppressing the strong swirling flow in this way, the flow velocity of the exhaust gas in the flow path can be uniformly introduced by the purifying unit. Therefore, it is possible to effectively function the purification section in the exhaust gas purification device.

In one aspect of the present disclosure, the exhaust dispersion section may be arranged in a facing portion representing a portion facing the purification section in the bent portion.
According to such a configuration, since the exhaust dispersion section is arranged at a position relatively far from the purifying section, it is possible to suppress narrowing of the exhaust flow path near the purifying section. Therefore, it is possible to suppress pressure loss of the exhaust due to narrowing of the flow path.

In one aspect of the present disclosure, the exhaust dispersion portion may protrude toward the purifying portion from the outer peripheral portion at a portion of the opposing portion excluding the outer peripheral portion representing the outer peripheral portion.
According to such a configuration, since the exhaust dispersion portion is arranged to protrude at a portion other than the outer peripheral portion, it is possible to form an exhaust flow path in two directions along the outer peripheral portion around the exhaust dispersion portion. An exhaust flow path can also be formed on the purification section side of the dispersing section. Therefore, since the exhaust gas can be dispersed in three directions and flowed, the exhaust gas can flow more uniformly in the flow path.

In one aspect of the present disclosure, the facing portion may approach the cleaning portion as it moves away from the introducing portion.
According to such a configuration, the exhaust gas flowing along the opposing portion can be easily guided toward the purifying portion, so that the exhaust gas can be further suppressed from becoming a swirling flow.

In one aspect of the present disclosure, the exhaust dispersion section may further include a protruding section configured such that at least a portion of the facing section protrudes toward the purification section.
According to such a configuration, since the exhaust dispersion portion is configured by projecting the opposing portion toward the purification portion, compared to a configuration in which the exhaust dispersion portion is a member different from the bent portion, the components of the exhaust gas purification device Points can be reduced.

In one aspect of the present disclosure, the exhaust dispersion section may further include a plate-shaped member that is arranged to protrude toward the purification section side at the facing section.
According to such a configuration, since the exhaust dispersion portion is made of a plate-like member, even if it is difficult to process the bent portion, the exhaust dispersion portion can be easily formed, and the exhaust gas can be dispersed satisfactorily. You can let it flow.

In one aspect of the present disclosure, the exhaust dispersion section is configured such that a portion of the introduction section appears to be blocked by the exhaust dispersion section when the bending section is viewed from the introduction section along the flow direction of the exhaust gas in the introduction section. You may

According to such a configuration, it is possible to reliably realize a configuration in which the exhaust gas introduced from the introduction portion flows in a dispersed manner so as to avoid the exhaust dispersion portion.
In one aspect of the present disclosure, the bent portion may have an exhaust flow path that bends such that the flow path on the upstream side of the bent portion and the flow path on the downstream side of the bent portion are orthogonal to each other. . In addition, "substantially orthogonal" may be included in "perpendicular" here. According to such a configuration, compared to a configuration in which the flow path on the upstream side of the bend and the flow path on the downstream side of the bend do not orthogonally cross each other, a strong swirl in one direction along the outer peripheral portion of the bend. Since a flow is generated, the exhaust gas can be dispersed more efficiently by providing the exhaust gas dispersion unit of this configuration. Therefore, the swirling flow can be efficiently suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the structure of the exhaust gas purification device of 1st Embodiment. FIG. 4 is a perspective view showing the configuration of a first bent portion; FIG. 4 is a front view showing the configuration of a first bent portion; FIG. 2 is a streamline diagram of exhaust gas in the exhaust purification device of the first embodiment. FIG. 3 is a streamline diagram of exhaust gas in an exhaust purification device of a reference example; FIG. 11 is a perspective view showing the configuration of a first bent portion of the second embodiment; It is a perspective view showing the configuration of an exhaust purification device of a third embodiment. FIG. 11 is a streamline diagram of exhaust gas in the exhaust purification device of the third embodiment. FIG. 11 is a flow velocity distribution diagram showing the flow velocity of exhaust gas in the exhaust emission control system of the third embodiment in terms of brightness. FIG. 5 is a flow velocity distribution diagram showing the flow velocity of exhaust gas in the exhaust emission control device of the reference example in terms of brightness. FIG. 11 is a perspective view showing the configuration of a first bent portion of a first modified example; FIG. 11 is a perspective view showing the configuration of a first bent portion of a second modified example;

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
[1. First Embodiment]
[1-1. composition]
An exhaust purification device 1 shown in FIG. 1 is a device that receives exhaust gas emitted from an internal combustion engine and has a function of purifying the exhaust gas. The exhaust purification device 1 is arranged adjacent to the internal combustion engine, for example, along the outer peripheral surface of the engine block. In addition, in drawings such as FIG. 1, the flow direction of the exhaust gas is indicated by an outline arrow. In addition, for example, a muffler or the like is arranged downstream of the exhaust emission control device 1 .

The exhaust purification device 1 includes an introduction portion 11 , a first bent portion 12 and a first connection portion 13 . Also, the exhaust purification device 1 may include the second bent portion 16 , the second connection portion 17 , and the plurality of catalysts 31 and 32 . The introduction portion 11, the first bent portion 12, the first connection portion 13, the second bent portion 16, and the second connection portion 17 are each formed in a tubular shape so that the inside of the pipe serves as the exhaust flow path 20. , flow paths 20 are configured to communicate with each other in sequence.

The introduction part 11 is positioned on the most upstream side with respect to the flow of exhaust gas in the exhaust purification device 1 and is a part into which the exhaust gas is introduced from the internal combustion engine.
The first bent portion 12 is a portion having an exhaust flow path 20 that bends on the downstream side of the introduction portion 11 . In the example shown in FIG. 1 , the first bent portion 12 has a function of deflecting the flow direction of the exhaust gas horizontally introduced from the introduction portion 11 downward in the vertical direction by the bent exhaust flow path 20 . . The introduction portion 11 is connected to the first bent portion 12 at a position slightly offset to the right of the center of the first bent portion 12 in the horizontal direction.

The first connection portion 13 is a portion having a linear flow path 20 that communicates with the flow path 20 in the first bent portion 12 on the downstream side of the first bent portion 12 . The second bent portion 16 is a portion having an exhaust flow path 20 that bends downstream of the first connection portion 13 . The second connecting portion 17 is a portion having a linear flow path 20 that communicates with the flow path 20 in the second bent portion 16 on the downstream side of the second bent portion 16 .

The plurality of catalysts 31 and 32 are each formed in a cylindrical shape, and are arranged and held in the first connection portion 13 and the second connection portion 17, respectively. A plurality of catalysts 31 and 32 have a function as a general catalyst. That is, the plurality of catalysts 31 and 32 have the function of promoting the action of purifying exhaust gas within a predetermined operating temperature range.

Next, the detailed configuration of the first bent portion 12 will be described with reference to FIGS. 2 and 3. FIG. 2 and 3, the inlet 11A is a cut end when the inlet 11 is cut on an arbitrary imaginary plane orthogonal to the flow direction of the exhaust gas in the inlet 11. In FIGS. A part of the first connecting portion 13 through the first bent portion 12 is illustrated.

Here, since the first bent portion 12 is a portion where the flow direction of the exhaust gas is deflected, the flow of the exhaust gas is likely to be non-uniform, and pressure loss of the exhaust gas is likely to occur. As a result of studies by the inventors, it has been found that the flow of the exhaust gas becomes non-uniform, and in order to suppress the pressure loss of the exhaust gas, it is desirable to suppress the swirling flow of the exhaust gas. In this embodiment, the first bent portion 12 is configured as follows in order to suppress the swirling flow of the exhaust gas.

A portion of the first bent portion 12 that faces the catalyst 31 arranged on the first connecting portion 13 is referred to as a facing portion 12A. In other words, the facing portion 12A is the vertically upper surface of the first bent portion 12 in this embodiment.

12 A of opposing parts are provided with the protrusion part 12B and 12 C of outer peripheral parts. The protruding portion 12B is a portion of the facing portion 12A, excluding the outer peripheral portion 12C, which protrudes toward the catalyst 31 side. The protruding portion 12B may be configured such that the distance from the catalyst 31, that is, the height of the flow path, decreases as the protruding portion 12B moves away from the inlet 11A in the opposite direction. It has the function of deflecting the flow direction of the exhaust air from the

Preferably, when viewing the projecting portion 12B from the inlet 11A, the projecting portion 12B may be wall-shaped, that is, configured such that the flow direction of the exhaust gas from the introducing portion 11 is deflected downward in the vertical direction. By configuring in this way, the exhaust gas from the inlet can be dispersed more, and the swirling flow can be suppressed.

The outer peripheral portion 12C is a portion on the outer peripheral side of the facing portion 12A. The outer peripheral portion 12C is configured to gradually approach the catalyst 31 as the distance from the introduction portion 11 increases. However, the distance from the catalyst 31 to the outer peripheral portion 12C in the present embodiment is set to be longer than the distance from the catalyst 31 to the protruding portion 12B even at the portion where the distance from the catalyst 31 is the shortest. be.

Here, FIG. 3 shows the state when the first bent portion 12 is viewed from the introduction port 11A along the flow direction of the exhaust gas in the introduction portion 11, particularly the introduction portion 11. As shown in FIG. In FIG. 3 , the area where the exhaust flows on the outer peripheral side of the facing portion 12A is defined as area A, and the area where the exhaust flows on the catalyst 31 side is defined as area C. As shown in FIG. Also, in FIG.

In the configuration of this embodiment, part of the introduction portion 11 appears to be blocked by the projecting portion 12B. In other words, protrusion 12B appears to occlude area B. FIG. However, the projecting portion 12B is arranged so as to form a flow path 20 continuing from the region B to the left side along the front side of the projecting portion 12B in FIG.

Such a protruding portion 12B has a function of dispersing the flow direction of part of the exhaust gas in the flow path 20 in the first bent portion 12 in a direction different from that of the other part of the exhaust gas. Specifically, as shown in FIG. 4, the flow direction of the exhaust gas passing through the region A is the flow direction A along the outer circumference of the first bent portion 12 on the right side of the projecting portion 12B.

Further, the flow direction of the exhaust gas passing through the region B is the flow direction B along the outer periphery of the first bent portion 12 on the left side of the projecting portion 12B. Further, the flow direction of the exhaust gas passing through the area C is the flow direction C from the lower side of the projecting portion 12B toward the catalyst 31. As shown in FIG.

Here, FIG. 4 is a streamline diagram showing a simulation result of the flow of exhaust gas in the first bent portion 12 of the first embodiment. It can be seen that in the example shown in FIG. 4, the swirling flow is weaker than in the example shown in FIG. 5, which will be described later. In the configuration of this embodiment, since the exhaust gas is dispersed in the flow directions A, B, and C, it is considered that the force of the exhaust gas flowing in one direction is weakened and the swirling flow is suppressed.

On the other hand, FIG. 5 shows a simulation result of the flow of the exhaust gas in a configuration (hereinafter referred to as a configuration of the reference example) that does not include the protruding portion 12B and includes only the flow path in which the first bent portion is simply bent. 1 shows a diagrammatic representation. It can be seen that in the example shown in FIG. 5, a strong swirling flow is generated as compared with the example shown in FIG. 4, and the exhaust gas flows in one direction without being dispersed.

[1-2. effect]
According to 1st Embodiment detailed above, there exist the following effects.
(1a) One aspect of the present disclosure is an exhaust purification device 1 that includes an introduction portion 11, a first bent portion 12, a first connection portion 13, a projecting portion 12B, and catalysts 31 and 32. .

The introduction part 11 is formed in a tubular shape, and exhaust gas is introduced therein. The first bent portion 12 is formed in a tubular shape and has an exhaust flow path 20 that bends on the downstream side of the introduction portion 11 . The first connecting portion 13 is formed in a tubular shape and has a linear flow path 20 that communicates with the flow path 20 in the first bent portion 12 on the downstream side of the first bent portion 12 .

The catalyst 31 is arranged inside the first connection portion 13 and has a function of purifying exhaust gas. The protruding portion 12B is arranged in the first bent portion 12 and has a function of dispersing the flow direction of a portion of the exhaust gas in a direction different from that of the other portion of the exhaust gas in the flow path 20 in the first bent portion 12. .

According to such a configuration, the projecting portion 12B disperses the flow of the exhaust gas, so that the flow velocity of the exhaust gas can be suppressed when the exhaust gas bends and flows. Therefore, when the exhaust gas moves from the first bent portion 12 to the first connecting portion 13, it is possible to suppress the generation of a strong unidirectional swirling flow. By suppressing the strong swirling flow in this way, the flow velocity of the exhaust gas in the flow path 20 can be uniformly introduced by the catalysts 31 and 32 . Moreover, since the swirling flow can be suppressed, the pressure loss of the exhaust gas can be suppressed. Therefore, the catalysts 31 and 32 can effectively function in the exhaust purification device 1 .

(1b) In one aspect of the present disclosure, the protruding portion 12B is arranged in the facing portion 12A representing the portion facing the catalysts 31 and 32 in the first bent portion 12 .
According to such a configuration, the projecting portion 12B is arranged at a position relatively far from the catalysts 31 and 32, so narrowing of the flow path 20 near the catalysts 31 and 32 can be suppressed. Therefore, it is possible to suppress pressure loss of the exhaust due to narrowing of the flow path 20 .

(1c) In one aspect of the present disclosure, the protruding portion 12B protrudes toward the catalysts 31 and 32 from the outer peripheral portion 12C at a portion other than the outer peripheral portion 12C representing the outer peripheral portion of the facing portion 12A.
According to such a configuration, since the protruding portion 12B is arranged to protrude at a portion other than the outer peripheral portion 12C, the exhaust flow path 20 can be formed in two directions along the outer peripheral portion 12C around the protruding portion 12B. Also, the exhaust flow path 20 can be formed on the catalyst 31, 32 side of the projecting portion 12B. Therefore, the exhaust gas can be dispersed in three directions and flowed, so that the exhaust gas can flow more uniformly in the flow path 20 .

(1d) In one aspect of the present disclosure, the facing portion 12A is configured to approach the catalysts 31 and 32 as it moves away from the introduction portion 11 .
According to such a configuration, the exhaust gas flowing along the opposing portion 12A can be easily guided toward the catalysts 31 and 32, so that the exhaust gas can be further suppressed from becoming a swirling flow.

(1e) In one aspect of the present disclosure, the protruding portion 12B is configured such that at least a portion of the facing portion 12A protrudes toward the catalysts 31 and 32 .
According to such a configuration, the protruding portion 12B is formed by protruding the opposing portion 12A toward the catalysts 31 and 32, so compared to a configuration in which the protruding portion 12B is a member different from the first bent portion 12, , the number of parts of the exhaust purification device 1 can be reduced.

(1f) In one aspect of the present disclosure, the protruding portion 12B is a part of the introductory portion 11 that is a protruding portion when the first bent portion 12 is viewed from the introductory portion 11 along the flow direction of the exhaust gas in the introductory portion 11. 12B is configured to appear occluded.

With such a configuration, it is possible to reliably realize a configuration in which the exhaust gas introduced from the introduction portion 11 flows in a dispersed manner so as to avoid the protruding portion 12B.
[2. Second Embodiment]
[2-1. Differences from First Embodiment]
Since the basic configuration of the second embodiment and the following embodiments is the same as that of the first embodiment, differences will be described below. Note that the same reference numerals as in the first embodiment indicate the same configurations, and refer to the preceding description.

In the exhaust emission control device 1 of the first embodiment described above, the first bent portion 12 has the projecting portion 12B. On the other hand, in the exhaust purification device 2 of the second embodiment, the first bent portion 12E does not include the projecting portion 12B, but includes the plate 15 having the same function as the projecting portion 12B. differ.

[2-2. composition]
In the exhaust purification device 2 of the second embodiment, as shown in FIG. 6, the first bent portion 12E does not include the protruding portion 12B, and the entire facing portion 12A has a distance from the catalyst 31 that is the outer peripheral portion 12C. It is configured to be the same as the curved surface that constitutes it. However, inside the facing portion 12A, that is, on the side of the catalyst 31, a plate 15, which is a plate-like member arranged so as to protrude from the facing portion 12A toward the catalyst 31 side, is provided. The plate 15 is arranged at a portion corresponding to the projecting portion 12B in the first embodiment, in other words, at a portion other than the catalyst 31 side of the outer peripheral portion 12C.

The plate 15 has a vertically erected member. The plate 15 generally matches the outer shape of the protrusion 12B. In the second embodiment, the plate 15 includes only vertically erected members, and does not include substantially horizontally arranged members for blocking the space surrounded by the members. However, as another embodiment, a substantially horizontally arranged member may be provided for blocking the space surrounded by the vertically erected member.

[2-3. effect]
According to the second embodiment described in detail above, the effect (1a) of the first embodiment described above is obtained, and the following effects are also obtained.

(2a) The exhaust gas purification device 2 further includes a plate 15 that protrudes toward the catalysts 31 and 32 from the facing portion 12A.
According to such a configuration, since the projecting portion 12B is configured by the plate 15, even if the first bent portion 12 is difficult to process, the exhaust gas can be dispersed and flowed well.

[3. Third Embodiment]
[3-1. Differences from First Embodiment]
In the first embodiment described above, the distance from the catalyst 31 to the outer peripheral portion 12C is set to be longer than the distance from the catalyst 31 to the protruding portion 12B even at the portion closest to the catalyst 31. was done. On the other hand, in the exhaust purification device 3 of the third embodiment, the distance from the catalyst 31 to the outer peripheral portion 12C is the same as the distance from the catalyst 31 to the projecting portion 12B at the portion where the distance from the catalyst 31 is the shortest. It is different from the first embodiment in that it is set to be

[3-2. composition]
As shown in FIG. 7, the exhaust purification device 3 of the third embodiment includes a first bent portion 12F. In the first bent portion 12F, the facing portion 12A has a projecting portion 12B and an outer peripheral portion 12C. However, in the first bent portion 12F of the third embodiment, as the outer peripheral portion 12C moves away from the introduction portion 11, the horizontal direction of the outer peripheral portion 12C is adjusted so that it approaches the catalyst 31 more rapidly than in the configuration of the first embodiment. The slope is configured to be larger.

As a result, the outer peripheral portion 12C is located far from the introduction portion 11 and is considerably close to the protruding portion 12B. The outer peripheral portion 12C and the protruding portion 12B do not need to form the same plane, but preferably, the outer peripheral portion 12C is integrated with the protruding portion 12B like the first bent portion 12F. It is preferable to construct the same plane.

FIG. 8 is a streamline diagram showing a simulation result of the flow of exhaust gas in the first bent portion 12F of the third embodiment. From FIG. 8, it can be seen that the exhaust gas is mainly distributed in the flow directions A, B and C, similar to the first bend 12 of the first embodiment.

9 and 10 show the distribution of the exhaust flow velocity on the upper surface of the catalyst 31. FIG. FIG. 9 shows the flow velocity distribution in the exhaust purification device 3 of the third embodiment, and FIG. 10 shows the flow velocity distribution in the configuration of the reference example. 9 and 10, the higher the brightness, the higher the flow velocity, and the more uniform the brightness, the more uniform the flow velocity.

In the configuration of the reference example shown in FIG. 10, there are portions with high brightness and portions with low brightness, and the flow velocity is uneven. It can be seen that the brightness is constant and the flow rate is uniform.

In addition, in the configuration of the exhaust emission control device 3 of the third embodiment, compared with the configuration of the reference example, the uniformity of the flow velocity, which is the degree to which the flow velocity of the exhaust gas is constant, is improved by about 14.6%. Further, in the configuration of the exhaust gas purification device 3 of the third embodiment, the uniformity of the flow velocity is improved by about 1.7% as compared with the exhaust gas purification device 1 of the first embodiment.

[3-3. effect]
According to the third embodiment described in detail above, the effect (1a) of the first embodiment described above is obtained, and the following effects are also obtained.

(3a) In one aspect of the present disclosure, the facing portion 12A of the first bent portion 12F is configured to approach the catalysts 31 and 32 as it moves away from the introduction portion 11 . In particular, the outer peripheral portion 12C approaches the protruding portion 12B considerably as the distance from the introduction portion 11 increases. Preferably, like the first bent portion 12F, the outer peripheral portion 12C is integrated with the protruding portion 12B at the portion farthest from the introduction portion 11, and forms the same plane as the protruding portion 12B.

According to such a configuration, the exhaust gas flowing along the opposing portion 12A can be easily guided toward the catalysts 31 and 32, so that the exhaust gas can be further suppressed from becoming a swirling flow. Further, in such a configuration, it is possible to suppress the generation of the swirling flow by narrowing the space in which the swirling flow of the exhaust gas is generated.

[4. Other embodiments]
Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications can be made.

(4a) In the above embodiment, the introduction portion 11 is configured to be connected to the first bent portion 12 at a position slightly offset to the right of the horizontal center of the first bent portion 12, but this is not the only option. not to be For example, like the first bent portion 12G of the first modified example shown in FIG. 11, in the configuration including the projecting portion 12B, the introduction portion 11 may be configured to be connected at the center in the horizontal direction. Further, in the configuration including the plate 15 instead of the protruding portion 12B like the first bent portion 12H of the second modified example shown in FIG. good too.

(4b) In the above embodiment, one of the projecting portion 12B and the plate 15 is provided, but both the projecting portion 12B and the plate 15 may be provided. According to such a configuration, the plate 15 can be used to compensate for the function of the projecting portion 12B when a large projecting amount of the projecting portion 12B with respect to the outer peripheral portion 12C cannot be ensured.

Further, for example, when the first bent portion 12G is shared by a plurality of vehicles, only the plate 15 is changed in order to optimize the flow of the exhaust gas when the type of internal combustion engine, that is, the mode of the flow of the exhaust gas, is different. configuration is conceivable. In this way, the shape of the plate 15 that optimizes the flow of exhaust gas can be selected according to the flow of the exhaust gas.

(4c) In the above embodiment, the catalysts 31 and 32 are provided as purification units having a function of purifying exhaust gas, but the present invention is not limited to this. For example, the purification unit may be configured to include a filter instead of the catalysts 31 and 32 or in addition to the catalysts 31 and 32 . As the filter, for example, a filter such as DPF (Diesel particulate filter) may be employed.

(4d) In the above embodiment, the exhaust dispersion parts such as the projecting part 12B and the plate 15 are arranged near the center of the first bent parts 12, 12E, 12F, 12G, 12H (hereinafter referred to as 12, etc.), but this is not the only option. not to be For example, the exhaust dispersion portion may be arranged so that the exhaust gas flowing in from the introduction port 11A hits the introduction port 11A side of the center of the first bent portion 12 or the like.

According to such a configuration, the exhaust dispersion portion is closer than the center of the first bent portion 12, etc., and more exhaust gas can hit the exhaust dispersion portion. can be suppressed.

(4e) A plurality of functions possessed by one component in the above embodiment may be realized by a plurality of components, or a function possessed by one component may be realized by a plurality of components. . Also, a plurality of functions possessed by a plurality of components may be realized by a single component, or a function realized by a plurality of components may be realized by a single component. Also, part of the configuration of the above embodiment may be omitted. Moreover, at least part of the configuration of the above embodiment may be added or replaced with respect to the configuration of the other above embodiment.

(4f) In addition to the exhaust purification devices 1, 2, and 3 described above, the present disclosure can also be implemented in various forms, such as a system using the exhaust purification devices 1, 2, and 3 as constituent elements.
[5. Correspondence between the configuration of the embodiment and the configuration of the present disclosure]
The first bent portion 12 or the like in the above embodiment corresponds to the bent portion in the present disclosure, and the first connecting portion 13 in the above embodiment corresponds to the connecting portion in the present disclosure. Further, the catalysts 31 and 32 in the above embodiment correspond to the purifying section in the present disclosure, and the projecting portion 12B and the plate 15 in the above embodiment correspond to the exhaust dispersion section in the present disclosure. Also, the plate 15 in the above embodiment corresponds to a plate-like member.

Reference Signs List 1, 2, 3 Exhaust purification device 11 Introductory portion 11A Introductory port 12, 12E, 12F, 12G, 12H First bent portion 12A Opposing portion 12B Protruding portion 12C Peripheral portion DESCRIPTION OF SYMBOLS 13... 1st connection part, 15... Plate, 16... 2nd bending part, 17... 2nd connection part, 20... Flow path, 31, 32... Catalyst.

Claims (8)

an introduction part formed in a tubular shape and into which exhaust gas is introduced;
a curved portion formed in a tubular shape and having a curved exhaust flow path on the downstream side of the introduction portion for deflecting the flow direction of the exhaust gas horizontally introduced from the introduction portion downward in the vertical direction; ,
a connecting portion formed in a tubular shape and having a channel communicating with the channel in the bent portion on the downstream side of the bent portion;
a purifying portion disposed in the connecting portion and having a function of purifying exhaust gas;
an exhaust dispersion unit disposed at the bend and having a function of dispersing a flow direction of part of the exhaust in a flow path at the bend in a direction different from that of the other part of the exhaust;
with
The introduction part is connected to the bent part at a position offset from the center in the left- right direction orthogonal to the horizontal direction at the bent part. The exhaust purification device according to claim 1,
The exhaust emission control device, wherein the exhaust dispersion section is arranged at a facing portion representing a portion facing the purification section at the bent portion. The exhaust purification device according to claim 2,
The exhaust gas dispersion unit is configured to protrude toward the purification unit from a portion of the opposed portion, excluding an outer peripheral portion representing a portion on the outer peripheral side. The exhaust purification device according to claim 2 or 3 ,
The exhaust dispersing part has a protruding part configured such that at least a part of the facing part protrudes toward the purification part;
An exhaust purification device further comprising: The exhaust purification device according to claim 4 citing claim 3,
An exhaust purification device configured such that a portion of the outer peripheral portion and the protruding portion form the same plane. The exhaust purification device according to any one of claims 2 to 5 ,
The exhaust emission control device, wherein the facing portion is configured to approach the purification portion as the distance from the introduction portion increases. The exhaust purification device according to any one of claims 2 to 6,
the exhaust dispersing portion is a plate-like member arranged so as to protrude toward the purifying portion at the facing portion;
An exhaust purification device further comprising: The exhaust purification device according to any one of claims 1 to 7,
The exhaust dispersion section is configured such that when the bending section is viewed from the introduction section along the flow direction of the exhaust gas in the introduction section, part of the introduction section appears to be blocked by the exhaust dispersion section. Exhaust purification device.

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