CN219061808U - Tightly coupled aftertreatment structure and diesel engine - Google Patents

Abstract

The utility model relates to the technical field of engine post-processing, and provides a tightly coupled post-processing structure and a diesel engine, wherein the tightly coupled post-processing structure includes: a pre-processing part, and the pre-processing part is provided with a catalyst cavity and a diversion cavity , the catalyst cavity and the diversion cavity are set separately, and a first catalytic element is arranged in the catalyst cavity; a post-processing part, the post-processing part is connected with the catalyst cavity and the diversion cavity respectively The body is connected, and the aftertreatment part is provided with a second catalytic element. The tightly coupled post-processing structure and the diesel engine provided by the utility model well solve the problem of excessive back pressure in the existing three-way catalytic converter.

Description

Tightly Coupled After-Processing Structure and Diesel Engine

technical field

The utility model relates to the technical field of engine aftertreatment, in particular to a tightly coupled aftertreatment structure and a diesel engine.

Background technique

This section provides background information related to the present disclosure only and is not necessarily prior art.

Diesel engines are widely used in various industries due to their good power, high fuel economy and strong stability. However, with the increasingly stringent emission regulations, the post-treatment technology of diesel engines is becoming more and more important. A catalytic converter is arranged behind the diesel engine It has become a necessary means to reduce harmful pollutants. The three-way catalytic converter has been accepted by most manufacturers. The three-way catalytic converter refers to the ability to simultaneously purify the three pollutions of hydrocarbons, carbon monoxide and nitrogen oxides in automobile exhaust. material catalytic converter.

However, the three-way catalytic converter in the prior art has limited post-processing space. When the exhaust gas flow rate is large or the operating speed is high, the exhaust gas cannot be processed in time, resulting in excessive back pressure in the post-processing space.

Utility model content

The purpose of the utility model is to at least solve the problem of excessive back pressure in the existing three-way catalytic converter. This purpose is achieved through the following technical solutions:

The first aspect of the utility model proposes a tightly coupled post-processing structure, including:

A pre-processing part, the pre-processing part is provided with a catalyst cavity and a diversion cavity, the catalyst cavity and the diversion cavity are arranged separately, and a first catalytic element is arranged in the catalyst cavity;

A post-processing part, the post-processing part communicates with the catalyst cavity and the flow guide cavity respectively, and the post-processing part is provided with a second catalytic element.

According to the close-coupled post-treatment structure of the present invention, when used to treat exhaust gas, a part of the exhaust gas enters the catalyst cavity and is catalyzed by the first catalytic element and flows out of the catalyst cavity, while the other part of the exhaust gas passes through the guide cavity and has been processed After a part of the exhaust gas is mixed, it enters the post-processing part and is catalyzed by the second catalytic part. By adding a diversion cavity in the pre-processing part and connecting the diversion cavity with the post-processing part, the internal space of the pre-processing part is effectively solved. Limited, when the exhaust flow rate is large or the speed is high, the exhaust gas cannot be processed in time, resulting in the problem of excessive back pressure in the pre-processing unit.

At the same time, the temperature in the pretreatment part is also reduced to avoid accelerating the thermal aging rate of the first catalytic part due to the excessive temperature in the pretreatment part. Durability.

In addition, according to the tightly coupled post-processing structure of the present invention, it may also have the following additional technical features:

In some embodiments of the present utility model, both the catalyst cavity and the first catalyst member are annular structures, the inside of the catalyst cavity is hollow, and the flow guide cavity passes through the catalyst cavity.

In some embodiments of the present utility model, the catalyst cavity and the guide cavity are arranged side by side in the direction perpendicular to the flow of air, and the outer surface of the catalyst cavity and the guide cavity The outer sides abut against each other.

In some embodiments of the present utility model, the aftertreatment part includes a casing, the second catalytic element is arranged in the casing, an intake pipe and an exhaust pipe are arranged on the casing, and the second The catalytic element divides the housing into a first cavity and a second cavity, the intake pipe communicates with the first cavity, and the exhaust pipe communicates with the second cavity.

In some embodiments of the present utility model, the volume of the first cavity is greater than the volume of the flow guiding cavity.

In some embodiments of the present utility model, the pre-treatment part includes an inlet section, a treatment section and an outlet section, the inlet section, the treatment section and the outlet section are connected in sequence, and the guide cavity is connected to the outlet section. The post-processing parts are connected through the outlet section.

In some embodiments of the present utility model, the processing section includes an annular outer shell and an annular inner shell, the catalyst cavity is formed between the annular outer shell and the annular inner shell, and the annular inner shell is hollowly arranged and constitutes the The guide cavity.

In some embodiments of the present utility model, the inner wall of the annular shell is provided with an outer liner, the inner wall of the annular inner shell is provided with an inner liner, and the outer liner and the inner liner are arranged opposite to each other. , and the first catalytic element is sandwiched between the outer liner and the inner liner.

In some embodiments of the present utility model, at least one baffle is arranged in the guide cavity, and a vent hole is arranged on the baffle.

The second aspect of the utility model provides a diesel engine, including the tightly coupled post-processing structure described in any one of the above items.

The diesel engine according to the utility model has the same advantages as the tightly coupled post-processing structure of the utility model, which will not be repeated here.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating preferred embodiments, and are not considered to limit the present invention. Also throughout the drawings, the same reference numerals are used to denote the same parts. In the attached picture:

Fig. 1 schematically shows a schematic view of the structure of a pre-processing section according to an embodiment of the present invention;

Fig. 2 schematically shows a schematic structural view of a post-processing unit according to an embodiment of the present invention;

Fig. 3 schematically shows a schematic view of the structure of the first catalytic element according to the embodiment of the present invention;

Fig. 4 schematically shows the structure diagram of the baffle according to the embodiment of the utility model.

Explanation of reference signs:

1 is the pre-processing section, 11 is the inlet section, 12 is the processing section, 121 is the annular outer shell, 122 is the annular inner shell, 123 is the outer liner, 124 is the inner liner, and 13 is the outlet section;

2 is the post-processing part, 21 is the casing, 211 is the first cavity, 212 is the second cavity, 22 is the second catalyst, 23 is the intake pipe, and 24 is the exhaust pipe;

3 is the catalyst chamber, 31 is the first catalyst; 4 is the diversion chamber, 41 is the baffle;

Arrows in Figure 1 indicate the flow direction of the airflow.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

It should be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may also be meant to include the plural forms unless the context clearly dictates otherwise. The terms "comprising", "comprising", "containing" and "having" are inclusive and thus indicate the presence of stated features, steps, operations, elements and/or parts but do not exclude the presence or addition of one or Various other features, steps, operations, elements, components, and/or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is specifically indicated. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be referred to as These terms are limited. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For the convenience of description, spatial relative terms may be used herein to describe the relationship of one element or feature as shown in the figures with respect to another element or feature, such as "inner", "outer", "inner". ", "Outside", "Below", "Below", "Above", "Above", etc. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "beneath" the other elements or features. feature above". Thus, the example term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The post-processing devices in diesel vehicles are mostly limited by the installation chassis boundary, and in consideration of raising the light-off temperature of the catalyst, a tightly coupled arrangement is often adopted.

Referring to Fig. 1 and Fig. 2, the first aspect of the utility model proposes a tightly coupled post-processing structure, including:

The pre-processing part 1, the pre-processing part 1 is provided with a catalyst cavity 3 and a diversion cavity 4, the catalyst cavity 3 and the diversion cavity 4 are arranged separately, and the catalyst cavity 3 is provided with a first catalytic element 31;

The post-processing part 2 communicates with the catalyst cavity 3 and the guide cavity 4 respectively, and the post-processing part 2 is provided with a second catalytic element 22 .

According to the close-coupled after-treatment structure of the present invention, when used to treat exhaust gas, a part of the exhaust gas enters the catalyst cavity 3 and is catalyzed by the first catalytic element 31 and flows out from the catalyst cavity 3, while the other part of the exhaust gas passes through the guide cavity 4 is mixed with a part of the exhaust gas that has been treated, enters the after-treatment part 2, and is catalyzed by the second catalytic element 22, by adding a diversion cavity 4 to the pre-treatment part 1 and combining the diversion cavity 4 with the after-treatment The two parts are connected, which effectively solves the problem that the space in the pre-processing part 1 is limited, and when the exhaust flow is large or the speed is high, the exhaust gas cannot be processed in time, which leads to the problem that the back pressure in the pre-processing part 1 is too high.

Simultaneously, the temperature in the pretreatment part 1 is also reduced to avoid accelerating the thermal aging rate of the first catalytic element 31 due to the excessive temperature in the pretreatment part 1. Therefore, according to the tightly coupled aftertreatment structure of the present invention, the Durability of the first catalytic element 31.

The materials of the first catalytic element 31 and the second catalytic element 22 are both TWC catalysts. TWC catalysts are three-way catalysts, also known as three-way catalysts. The three-way catalysts can simultaneously purify hydrocarbons, carbon monoxide and nitrogen oxides in automobile exhaust. Compound three pollutants.

Referring to Fig. 1 and Fig. 3, in some embodiments of the present invention, the catalyst cavity 3 is an annular structure, and since the first catalytic element 31 is arranged in the catalyst cavity 3, therefore, the first catalytic element 31 is also The catalyst cavity 3 has a ring structure, and the interior of the catalyst cavity 3 is hollow, and the guide cavity 4 passes through the catalyst cavity 3 , that is to say, the outer surface of the flow guide cavity 4 abuts against the inner surface of the catalyst cavity 3 .

Of course, in some other embodiments of the present utility model, the catalyst cavity 3 and the guide cavity 4 are arranged side by side in the direction perpendicular to the air flow, and the positional relationship between the guide cavity 4 and the catalyst cavity 3 can also be used as The following changes are made: the outer surface of the catalyst cavity 3 and the outer surface of the guide cavity 4 are abutted against each other. The tight-coupled post-treatment structure thus formed can also solve the problem of excessive back pressure in the existing three-way catalytic converter.

Specifically, the pre-treatment section 1 includes an inlet section 11, a treatment section 12, and an outlet section 13. The inlet section 11, the treatment section 12, and the outlet section 13 are connected in sequence, and the flow guide cavity 4 and the post-treatment section 2 are connected through the outlet section 13. The catalyst cavity 3 and the aftertreatment part 2 are also connected through the outlet section 13, and the catalyst cavity 3 and the diversion cavity 4 are both arranged in the treatment section 12, so another part of the exhaust gas passes through the diversion cavity 4 and a part of the exhaust gas that has been processed by the first catalytic element 31 are mixed in the outlet section 13 , enter the aftertreatment part 2 , and are catalytically treated by the second catalytic element 22 .

Further, the radial dimension of the inlet section 11 near the treatment section 12 is greater than the radial dimension away from the treatment section 12. Similarly, the radial dimension of the outlet section 13 near the treatment section 12 is greater than the radial dimension away from the treatment section 12, thus the inlet The section 11 and the outlet section 13 are both conical structures, so that the speed of the exhaust gas entering the treatment section 12 from the inlet section 11 is relatively slow, which effectively increases the treatment efficiency of the exhaust gas. At the same time, the exhaust gas in the treatment section 12 is collected through the outlet section 13 Afterwards, the post-processing unit 2 is used, so that the exhaust gas entering the post-processing unit 2 is relatively smooth, and the exhaust gas does not interfere in the post-processing unit 2, thereby avoiding affecting the treatment efficiency of the post-processing unit 2 on the exhaust gas.

Referring to Fig. 1 and shown in Fig. 3, in some embodiments of the present utility model, processing section 12 comprises annular shell 121 and annular inner shell 122, forms catalyst chamber 3 between annular outer shell 121 and annular inner shell 122, annular inner shell 122 is hollow and forms the guide chamber 4 , the catalyst chamber 3 and the first catalytic member 31 thus constituted are ring-shaped, and the guide chamber 4 passes through the catalyst chamber 3 .

Further, the inner wall of the annular shell 121 is provided with an outer liner 123, the inner wall of the annular inner shell 122 is provided with an inner liner 124, the outer liner 123 and the inner liner 124 are arranged oppositely, and the first catalytic element 31 clamps Located between the outer liner 123 and the inner liner 124 , the material of the outer liner and the inner liner is relatively soft for protecting the first catalytic element 31 .

In other embodiments of the present utility model, the treatment section 12 only includes an annular shell 121, and a separation plate is arranged in the interior of the annular shell 121 along its axial direction, and the inner cavity of the annular shell 121 is separated into catalyst by the separation plate. The cavity 3 and the guide cavity 4, at this time, the outer surface of the catalyst cavity 3 and the outer surface of the guide cavity 4 are in contact.

Similarly, the inner wall surface of the part of the annular shell 121 and the end surface of the separation plate away from the flow guide cavity 4 are provided with an outer liner 123, and the first catalytic element 31 is clamped between the outer liners 123, and the effect of the outer liner 123 It has been described above and will not be repeated here.

Referring to Fig. 1 and Fig. 4, in some other embodiments of the present invention, at least one baffle 41 is provided in the diversion chamber 4, and another part of exhaust gas enters the post-processing part 2 through the diversion chamber 4 Catalyzed by the second catalytic element 22, the baffle 41 is provided with vent holes for exhaust gas to pass through. The effect of setting the baffle is: on the one hand, it is used to support the treatment section 12, and on the other hand, it is used to reduce the exhaust gas entering the post-treatment process. The amount of the part 2, and then reduce the processing pressure of the post-processing part 2, and finally increase the processing efficiency of the post-processing part 2.

Further, the number of baffles 41 is preferably two, and along the axial direction of the annular inner shell 122, the two baffles 41 are arranged parallel to each other and spaced apart, so as to further support the processing section 12 and further increase post-processing Part 2 processing efficiency.

Referring to FIG. 2 , specifically, the aftertreatment part 2 is in communication with the outlet section 13, the aftertreatment part 2 includes a casing 21, the second catalytic element 22 is arranged in the casing 21, and the casing 21 is provided with an air intake pipe 23 And the exhaust pipe 24, the second catalytic element 22 divides the housing 21 into the first cavity 211 and the second cavity 212, one end of the intake pipe 23 is connected with the first cavity 211, and the other end is connected with the outlet section 13 Pass; the exhaust pipe 24 is connected with the second cavity 212 .

Further, the inlet pipe 23 extends into the first cavity 211, and the side of the end of the inlet pipe 23 extending into the first cavity 211 is provided with an exhaust hole, and the gas entering through the inlet pipe 23 flows into the first cavity from the exhaust hole. The catalytic reaction is carried out in the body 211.

It should be noted that the volume of the first cavity 211 should be larger than the volume of the diversion cavity 4, preferably much larger, so as to solve the problem that the exhaust gas cannot be processed in time when the exhaust flow rate is large or the operating speed is high. As a result, the back pressure in the pre-processing unit is too high.

The second aspect of the utility model provides a diesel engine, including the tightly coupled post-processing structure described in any one of the above items.

The diesel engine according to the utility model has the same advantages as the tightly coupled post-processing structure of the utility model, which will not be repeated here.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any person familiar with the technical field can easily think of All changes or replacements should fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (10)

1. A tightly coupled aftertreatment structure, comprising:

the pretreatment part is internally provided with a catalyst cavity and a diversion cavity, the catalyst cavity and the diversion cavity are arranged in a separated mode, and a first catalytic piece is arranged in the catalyst cavity;

and the post-treatment part is respectively communicated with the catalyst cavity and the flow guiding cavity, and is provided with a second catalytic piece.

2. The tightly-coupled aftertreatment structure of claim 1, wherein the catalyst cavity and the first catalytic member are both annular structures, the catalyst cavity is hollow inside, and the flow directing cavity passes through the catalyst cavity.

3. The tightly-coupled aftertreatment structure of claim 1, wherein the catalyst cavity and the flow directing cavity are disposed side-by-side in a direction perpendicular to the flow of the gas stream, and an outer side of the catalyst cavity abuts an outer side of the flow directing cavity.

4. The tightly coupled aftertreatment structure of claim 1, wherein the aftertreatment portion comprises a housing, the second catalytic element is disposed within the housing, an air inlet tube and an air outlet tube are disposed on the housing, the second catalytic element divides the housing into a first cavity and a second cavity, the air inlet tube is in communication with the first cavity, and the air outlet tube is in communication with the second cavity.

5. The close-coupled aftertreatment structure of claim 4, wherein a volume of the first cavity is greater than a volume of the flow directing cavity.

6. The tightly coupled aftertreatment structure of claim 2, wherein the pretreatment portion comprises an inlet section, a treatment section, and an outlet section, the inlet section, the treatment section, and the outlet section being sequentially connected, the flow directing cavity being in communication with the aftertreatment portion via the outlet section.

7. The close-coupled aftertreatment structure of claim 6, wherein the treatment section comprises an annular outer shell and an annular inner shell, the annular outer shell and the annular inner shell forming the catalyst cavity therebetween, the annular inner shell being hollow and forming the flow directing cavity.

8. The tightly-coupled aftertreatment structure of claim 7, wherein an inner wall surface of the annular outer shell is provided with an outer liner, an inner wall surface of the annular inner shell is provided with an inner liner, the outer liner and the inner liner are disposed opposite one another, and the first catalytic element is sandwiched between the outer liner and the inner liner.

9. The tightly coupled aftertreatment structure of claim 1, wherein at least one baffle is disposed within the flow directing cavity, and wherein a vent is disposed on the baffle.

10. A diesel engine comprising a tightly coupled aftertreatment structure according to any one of claims 1-9.

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