CN112664304A

CN112664304A - Take six engine structures in state of tertiary aftertreatment

Info

Publication number: CN112664304A
Application number: CN202011472396.1A
Authority: CN
Inventors: 孙朝进; 樊心龙; 董家枝
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2020-12-14
Filing date: 2020-12-14
Publication date: 2021-04-16

Abstract

The invention discloses a national six-engine structure with three-stage aftertreatment, which comprises an engine body, a primary aftertreatment device, a secondary aftertreatment device and a tertiary aftertreatment device, wherein the primary aftertreatment device, the secondary aftertreatment device and the tertiary aftertreatment device are sequentially connected, the primary aftertreatment device is a mixer SCR (selective catalytic reduction) assembly, the secondary aftertreatment device is a catalytic silencer, the tertiary aftertreatment device is a catalytic filter, the primary aftertreatment device is tightly coupled with the engine body, and the secondary aftertreatment device is arranged on a gearbox or a finished automobile beam. The invention provides a national six-engine structure with three-stage aftertreatment, which can improve the performance of a pickup truck matched with an engine, reduce the arrangement difficulty of the engine and reduce the overall cost of the engine.

Description

Take six engine structures in state of tertiary aftertreatment

Technical Field

The invention relates to the technical field of engines, in particular to a national six-engine structure with three-stage aftertreatment.

Background

For a conventional diesel engine, the post-treatment needs to be packaged into a primary package and arranged on a whole vehicle floor, a supercharger is connected with the post-treatment through a connecting pipe after whirling, and the post-treatment packaged whole vehicle arrangement usually needs sufficient frame space to ensure an assembly gap.

However, for a passenger pickup truck, the post-processing packaging volume is large due to the fact that the carriers are multiple in packaging volume, and the post-processing packaging volume cannot be packaged into a primary packaging volume on a chassis due to the limitation of a frame structure and the narrow arrangement space. In the prior art, the post-processing is made into a U shape or split into two stages to realize the arrangement of an engine on the whole vehicle.

The post-processing is made into a U-shaped arrangement, and the carrier is difficult to manufacture, the packaging cost is increased, the size is large, the arrangement difficulty is increased, and the limitation of a matched passenger car is limited.

Disclosure of Invention

Aiming at the problems, the invention provides a national six-level engine structure with three-level aftertreatment, which can improve the performance of a pickup truck matched with an engine, reduce the arrangement difficulty of the engine and reduce the overall cost of the engine.

The invention adopts the following technical scheme to realize the purpose:

the utility model provides a take six engine structures in state of tertiary aftertreatment, includes the engine body, still includes the one-level aftertreatment ware, second grade aftertreatment ware and the tertiary aftertreatment ware that connect gradually, and the one-level aftertreatment ware is blender SCR subassembly, and the second grade aftertreatment ware is catalytic muffler, and the tertiary aftertreatment ware is catalytic filter, and the one-level aftertreatment ware is tightly coupled with the engine body, and the second grade aftertreatment ware is installed on gearbox or whole car girder.

Preferably, a supercharger is arranged on the engine body, and the air inlet end of the primary after-treatment device is connected with the supercharger through a clamping hoop.

Preferably, the first-stage postprocessor, the second-stage postprocessor and the third-stage postprocessor are sequentially connected through an exhaust pipe, and an exhaust end of the third-stage postprocessor is also connected with the exhaust pipe.

Preferably, the three-stage postprocessor is connected with the two-stage postprocessor through a spherical flange, and an active regeneration device is arranged at the air inlet end of the three-stage postprocessor (4).

The invention has the beneficial effects that:

according to the structure of the national six-level engine with three-level post-treatment, the supercharger and the pipeline of the engine are rearranged, so that the engine body is integrated with the first-level post-treatment device; the secondary postprocessor is fixed on the gearbox or the whole vehicle girder, so that the problem that the whole flexible joint vehicle cannot be arranged is solved; the spherical flange is used for connecting the secondary post-processor and the tertiary post-processor, so that the problem that the hooks cannot be arranged is solved; the three-stage postprocessor has an active regeneration function, and the problem that the regeneration temperature of the DPF is insufficient when the DPF is far away from the air outlet of the engine is solved.

Drawings

Fig. 1 is a schematic structural diagram of a structure of a six-engine with three-stage aftertreatment according to an embodiment of the invention.

In the figure, 1-engine body, 2-first-stage after-treatment device, 3-second-stage after-treatment device, 4-third-stage after-treatment device, 5-gear box, 6-supercharger, 7-exhaust pipe, 8-spherical flange and 9-active regeneration device.

Detailed Description

The present invention will be described in detail with reference to the accompanying fig. 1 and the embodiments.

Referring to fig. 1, the present embodiment provides a six-engine structure with three-stage aftertreatment, including an engine body 1, and further including a primary aftertreatment device 2, a secondary aftertreatment device 3, and a three-stage aftertreatment device 4, which are sequentially connected, where the primary aftertreatment device 2 is a mixer SCR component, the secondary aftertreatment device 3 is a catalytic muffler, and the three-stage aftertreatment device 4 is a catalytic filter. The primary postprocessor 2 is tightly coupled with the engine body 1, and the secondary postprocessor 3 is arranged on a gearbox 5 or a girder of the whole vehicle.

According to the national six-engine structure with the three-stage post-treatment, the primary post-treatment device 2 is compact in structure, small in occupied space and convenient to arrange pipelines, and the length of a connecting pipeline is effectively shortened, so that the resistance of fluid flow is greatly reduced, the smoothness of an exhaust pipe 7 is ensured, and engine faults are avoided. When the national six-level engine structure with the three-level post-treatment is used, the discharged waste gas is sequentially treated by the primary post-processor 2, the secondary post-processor 3 and the third post-processor 4, and the treated clean tail gas is finally discharged into the atmosphere.

According to the structure of the national six-level engine with three-level post-treatment, the supercharger 6 and the pipeline are rearranged, and the first-level post-treatment device 2 is integrated on the engine body 1; the secondary post-processor 3 is fixed on the whole vehicle gearbox 5 or a whole vehicle girder through a packaging support, so that the problem that the whole flexible joint vehicle cannot be arranged is solved; the spherical flange 8 is used for connecting the secondary post-processor 3 and the tertiary post-processor 4, so that the problem that the hook cannot be arranged is solved.

As one of the embodiments, the engine body 1 is provided with a supercharger 6, and the intake end of the primary aftertreatment device 2 is connected to the supercharger 6 by a clip. The exhaust gas discharged from the turbine end of the supercharger 6 is communicated with the first-stage post-processor 2, then enters the second-stage post-processor 3 through the exhaust pipe 7 to filter harmful impurities and eliminate noise, and finally the exhaust gas treated by the third-stage post-processor 4 is discharged into the atmosphere.

As one of the embodiments, the primary post-processor 2, the secondary post-processor 3, and the tertiary post-processor 4 are connected in this order via an exhaust pipe 7, and the exhaust pipe 7 is also connected to the outlet end of the tertiary post-processor 4. The tail gas sequentially passes through a first-stage postprocessor 2, an exhaust pipe 7, a second-stage postprocessor 3, the exhaust pipe 7, a third-stage postprocessor 4 and the exhaust pipe 7 and finally enters the atmosphere.

As one of the embodiments, the intake end of the tertiary post-processor 4 is connected to the secondary post-processor 3 through a spherical flange 8. And an active regeneration device 9 is provided at the intake end of the three-stage aftertreatment device 4 so that the active regeneration device 9 can inject urea at a higher temperature in front of the intake end of the three-stage aftertreatment device 4. Since urea is injected before the three-stage after-treatment device 4 and at a high temperature, the urea injection temperature is increased, and the conversion into NO is facilitated₂，NO₂The content is increased, so that the DPF regeneration efficiency can be improved, and the oil consumption of an engine can be further reduced. The tertiary after-treatment device 4 has a regeneration function, and solves the problem that the regeneration temperature of the DPF is insufficient too far away from the air outlet of the engine.

Although the invention has been described in detail above with reference to specific embodiments, it will be apparent to one skilled in the art that modifications or improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. The utility model provides a take six engine structures in state of tertiary aftertreatment, including engine body (1), a serial communication port, still including one-level aftertreatment ware (2) that connect gradually, second grade aftertreatment ware (3) and tertiary aftertreatment ware (4), one-level aftertreatment ware (2) are blender SCR subassembly, second grade aftertreatment ware (3) are catalytic muffler, tertiary aftertreatment ware (4) are catalytic filter, one-level aftertreatment ware (2) and engine body (1) close coupling, second grade aftertreatment ware (3) are installed on gearbox (5) or whole car girder.

2. The structure of a national six engine with three-stage aftertreatment according to claim 1, wherein the engine body (1) is provided with a supercharger (6), and the air inlet end of the primary aftertreatment device (2) is connected with the supercharger (6) through a clamping hoop.

3. The structure of a national six-level engine with three-level post-treatment according to claim 1, characterized in that the primary post-processor (2), the secondary post-processor (3) and the tertiary post-processor (4) are connected in sequence through an exhaust pipe (7), and the exhaust end of the tertiary post-processor (4) is also connected with the exhaust pipe (7).

4. The structure of a national six-engine with three-stage after-treatment according to claim 1, characterized in that the three-stage after-treatment device (4) is connected with the two-stage after-treatment device (3) through a spherical flange (8), and an active regeneration device (9) is arranged at the air inlet end of the three-stage after-treatment device (4).