CN219932293U

CN219932293U - Tail gas aftertreatment's connection structure

Info

Publication number: CN219932293U
Application number: CN202321125280.XU
Authority: CN
Inventors: 陈法献; 洪云杰; 王勇; 甘在见; 罗雨馨
Original assignee: Zhejiang Bondlye Environmental Technology Co ltd
Current assignee: Zhejiang Bondlye Environmental Technology Co ltd
Priority date: 2023-05-11
Filing date: 2023-05-11
Publication date: 2023-10-31
Anticipated expiration: 2033-05-11

Abstract

The utility model relates to the technical field of connection of tail gas aftertreatment devices, in particular to a connection structure for tail gas aftertreatment. The connecting structure for tail gas aftertreatment comprises a TWC cylinder body and a GPF cylinder body, wherein one end of the GPF cylinder body is provided with a connecting part (21) which extends along the axial direction and is radially coated outside part of the TWC cylinder body, and the connecting part is fixedly welded with the TWC cylinder body. According to the utility model, the port of the connecting part is radially reduced to form the necking, the necking is attached to the outer wall of the TWC barrel, the TWC barrel and the GPF barrel are connected and fixed through welding the necking and the outer wall of the TWC barrel, the whole structure is compact, the problem of shortage of installation space caused by high limitation of the whole axial space size of the product is effectively solved, meanwhile, the traditional machining flange connection mode is avoided, the required part materials are fewer, and the cost is lower.

Description

Tail gas aftertreatment's connection structure

Technical Field

The utility model relates to the technical field of connection of tail gas aftertreatment devices, in particular to a connection structure for tail gas aftertreatment.

Background

The catalyst is the most important external purifying device installed in the exhaust system of automobile, and can convert the harmful gases of carbon monoxide, hydrocarbon, nitrogen oxide and the like discharged from the automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction, so that the automobile exhaust can be purified.

As shown in fig. 1, chinese patent publication No. CN215256408U discloses a structure of an exhaust aftertreatment catalyst for a gasoline engine of a vehicle, which includes a front three-way catalyst assembly and a rear four-way catalyst assembly, wherein the rear end of the front three-way catalyst assembly and the front end of the rear four-way catalyst assembly are respectively connected with a connecting flange, and the front three-way catalyst assembly and the rear four-way catalyst assembly are connected into a whole through the connecting flange. The front-stage three-way catalyst assembly comprises a front-stage catalyst cylinder, a front-stage air inlet flange, a fixed support, a heat shield and the like, and the rear-stage four-way catalyst assembly comprises a rear-stage catalyst cylinder, a flexible corrugated pipe and the like.

The exhaust aftertreatment catalyst structure of the automotive gasoline engine has larger requirement on the whole axial space, and the traditional machining flange connection mode has the defects of more required part materials and high cost.

As shown in fig. 2, chinese patent publication No. CN111396176a discloses a catalyst for engine combustion development stage and a processing method, the catalyst comprising a catalyst carrier assembly disposed between an inlet assembly and an outlet assembly, the catalyst carrier assembly comprising a TWC assembly and a GPF assembly, the GPF assembly comprising a cylinder, a liner disposed inside the cylinder, and a carrier layer disposed on the liner. The TWC component is connected with the air inlet component, the GPF component is connected with the TWC component through a transition cone, a base connected with an upper differential pressure air duct is arranged on the transition cone, and the air outlet component 1 is connected with the GPF component through a conical component.

The GPF component and the TWC component of the catalyst and the processing method for the engine combustion development stage are connected through the transition cone, so that connecting parts are added, the cost is increased, and the connecting procedure is increased.

Disclosure of Invention

The utility model aims to provide a connecting structure for tail gas aftertreatment, which is suitable for products with higher overall axial space size limitation and no overlarge space between two carriers by increasing the design of necking, has a compact structure and low cost, and can be applied to a tail gas aftertreatment device as a modularized design.

In order to achieve the advantages, the connecting structure for tail gas aftertreatment comprises a TWC cylinder body and a GPF cylinder body, and is characterized in that one end of the GPF cylinder body is provided with a connecting part which extends along the axial direction and is radially coated outside part of the TWC cylinder body, and the connecting part is welded and fixed with the TWC cylinder body.

In one embodiment of the connection structure for exhaust aftertreatment of the present utility model, the port of the connection portion radially narrows to form a constriction, the constriction is attached to the outer wall of the TWC cylinder, and is welded and fixed with the outer wall of the TWC cylinder through the constriction.

In one embodiment of the exhaust aftertreatment connection structure of the present utility model, the weld of the constriction to the outer wall of the TWC barrel is located in the middle of the TWC barrel.

In one embodiment of the exhaust aftertreatment connection structure of the utility model, the TWC barrel is encapsulated with a TWC carrier and a TWC liner radially positioned between the TWC barrel and the TWC carrier.

In one embodiment of the exhaust aftertreatment connection structure of the present utility model, the GPF cylinder is encapsulated with a GPF carrier and a GPF mat radially positioned between the GPF cylinder and the GPF carrier.

In one embodiment of the exhaust aftertreatment connection structure of the utility model, the axial spacing between the TWC and GPF carriers is between 30-50 mm.

In one embodiment of the connecting structure for tail gas aftertreatment, the other end of the GPF cylinder is communicated with an air outlet end cover, the air outlet end cover is communicated with an air outlet pipe, and an air outlet flange is arranged at the end part of the air outlet pipe.

In one embodiment of the exhaust gas aftertreatment connection structure of the present utility model, the other end of the TWC barrel communicates with an intake end cap having an intake port provided with an intake flange.

In one embodiment of the connecting structure for tail gas aftertreatment, the necking is in transitional connection with the GPF cylinder body through a reducing section, the length of the reducing section plus the length of the necking is equal to L, and the length range of L is 15-30 mm.

In one embodiment of the exhaust gas aftertreatment connection structure of the present utility model, the TWC cylinder and the GPF cylinder are both made of SUS441 material.

According to the utility model, the port of the connecting part is radially reduced to form the necking, the necking is attached to the outer wall of the TWC barrel, the TWC barrel and the GPF barrel are connected and fixed through welding the necking and the outer wall of the TWC barrel, the whole structure is compact, the problem of shortage of installation space caused by high limitation of the whole axial space size of the product is effectively solved, meanwhile, the traditional machining flange connection mode is avoided, the required part materials are fewer, and the cost is lower.

In the utility model, the diameters of the TWC carrier and the GPF carrier are inconsistent, so the corresponding cylinder sizes are inconsistent in design, and the utility model can be applied to an exhaust gas aftertreatment device as a modularized design by increasing the design of necking aiming at the cylinder structures with two different diameters.

Drawings

Fig. 1 is a schematic diagram of a prior art vehicular gasoline engine exhaust gas aftertreatment catalyst structure.

Fig. 2 is a schematic diagram of a prior art catalyst for the combustion development stage of an engine and a processing method.

Fig. 3 is a schematic view of a connection structure for exhaust aftertreatment of a first embodiment of the present utility model.

Fig. 4 is a cross-sectional view of the TWC and GPF barrels of fig. 3.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the utility model and practice it.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus they should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; of course, it may be mechanically or electrically connected; in addition, the connection may be direct, indirect via an intermediate medium, or communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 2-3, the connection structure for exhaust gas aftertreatment in the first embodiment of the present utility model includes a TWC cylinder 1 and a GPF cylinder 2, wherein one end of the GPF cylinder 2 has a connection portion 21 extending along an axial direction and radially wrapping a portion of the TWC cylinder 1, and the connection portion 21 is welded and fixed with the TWC cylinder 1.

Specifically, the port of the connecting portion 21 is radially narrowed to form a reduced opening 211, the reduced opening 211 is bonded to the outer wall of the TWC cylinder 1, and the reduced opening 211 is welded to the outer wall of the TWC cylinder 1. The weld of the reduced mouth 211 to the outer wall of the TWC barrel 1 is located in the middle of the TWC barrel 1. The necking 211 is in transitional connection with the GPF cylinder 2 through a reducing section 212, the length of the reducing section 212 is equal to L, and the length of the L is 15-30 mm.

In other embodiments of the utility model, the location of the weld may be adjusted based on the overall axial space size of the product.

The TWC cartridge 1 encloses a TWC carrier 3 and a TWC liner 5 radially between the TWC cartridge 1 and the TWC carrier 3. The GPF cylinder 2 is internally encapsulated with a GPF carrier 4 and a GPF gasket 6 located radially between the GPF cylinder 2 and the GPF carrier 4.

Preferably, the TWC carrier 3 has a frontal dimension of Φ118.4X1152.4 and the GPF carrier 4 has a dimension of Φ132.1X101.6. The axial spacing between the TWC carrier 3 and the GPF carrier 4 is between 30-50 mm.

The other end of the GPF cylinder 2 is communicated with an air outlet end cover 7, the air outlet end cover 7 is communicated with an air outlet pipe 71, and an air outlet flange 711 is arranged at the end part of the air outlet pipe 71. The other end of the TWC cylinder 1 communicates with an intake end cap 8, the intake end cap 8 having an intake port 81, the intake port 81 being provided with an intake flange 811.

Preferably, the TWC cylinder 1 and the GPF cylinder 2 are made of SUS441 materials.

The above-described embodiments are merely preferred embodiments for fully explaining the present utility model, and the scope of the present utility model is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present utility model, and are intended to be within the scope of the present utility model. The protection scope of the utility model is subject to the claims.

Claims

1. The utility model provides a tail gas aftertreatment's connection structure, includes TWC barrel (1), GPF barrel (2), its characterized in that, the one end of GPF barrel (2) has along axial extension and radial cladding in part TWC barrel (1) is external connecting portion (21), this connecting portion (21) with TWC barrel (1) welded fastening.

2. The exhaust aftertreatment connection structure according to claim 1, wherein the port of the connection portion (21) is radially narrowed to form a reduced opening (211), the reduced opening (211) is attached to the outer wall of the TWC cylinder (1), and the reduced opening (211) is welded to the outer wall of the TWC cylinder (1).

3. The exhaust aftertreatment connection according to claim 2, characterized in that the weld point of the constriction (211) with the outer wall of the TWC barrel (1) is located in the middle of the TWC barrel (1).

4. The exhaust aftertreatment connection according to claim 1, characterized in that the TWC barrel (1) is internally encapsulated with a TWC carrier (3) and a TWC liner (5) radially between the TWC barrel (1) and the TWC carrier (3).

5. The exhaust aftertreatment connection according to claim 4, characterized in that the GPF cylinder (2) is internally encapsulated with a GPF carrier (4) and a GPF gasket (6) radially located between the GPF cylinder (2) and the GPF carrier (4).

6. The exhaust aftertreatment connection according to claim 5, characterized in that the axial distance between the TWC carrier (3) and the GPF carrier (4) is between 30-50 mm.

7. The connecting structure for tail gas aftertreatment according to claim 1, wherein the other end of the GPF cylinder (2) is communicated with an air outlet end cover (7), the air outlet end cover (7) is communicated with an air outlet pipe (71), and an air outlet flange (711) is arranged at the end part of the air outlet pipe (71).

8. The exhaust aftertreatment connection according to claim 1, characterized in that the other end of the TWC cylinder (1) communicates with an inlet end cap (8), the inlet end cap (8) having an inlet port (81), the inlet port (81) being provided with an inlet flange (811).

9. The connecting structure for exhaust aftertreatment according to claim 2, characterized in that the necking (211) is in transitional connection with the GPF cylinder (2) through a reducing section (212), the length of the reducing section (212) plus the length of the necking (211) is equal to L, and the length of L ranges from 15 mm to 30 mm.

10. The exhaust aftertreatment connection structure according to claim 1, wherein the TWC cylinder (1) and the GPF cylinder (2) are made of SUS441 material.