Exhaust purification post-processing structure of non-road diesel engine

Abstract

The utility model relates to a non-road diesel engine exhaust purification post-treatment structure which is characterized in that a post-treatment body is formed by a DOC (Diesel Oxidation Catalyst) assembly, a DPF (Diesel Particulate Filter) assembly, a mixer and an SCR (Selective Catalytic Reduction) assembly; the DOC assembly comprises a DOC body heat insulation cover, the DPF assembly comprises a DPF body heat insulation cover, the mixer and the SCR assembly comprise a mixer and an SCR heat insulation cover, and the post-treatment outer heat insulation cover is fixed to the post-treatment body. The temperature sensor, the nitrogen-oxygen sensor and the differential pressure sensor are positioned on the post-processing outer heat shield and connect measuring points to the post-processing body; the nozzle is fixed to a nozzle base of the mixer and selective catalytic reduction (SCR) assembly through a bolt, and the urea injection pipe and the nozzle cooling pipe are connected with the nozzle. The utility model has the advantages of light weight, small width and high pollutant conversion efficiency, reduces the post-treatment surface temperature, and improves the installation efficiency of the whole vehicle.

Description

Technical Field

[0001] The utility model belongs to the technical fields of vehicle engine exhaust emission purification and energy conservation and consumption reduction, and particularly relates to an after-treatment structure for exhaust purification of a non-road diesel engine. Background Technique

[0002] The fourth-stage emission regulations for non-road diesel engines were fully implemented after December 2022, and each engine factory is going all out to reserve non-road diesel engine after-treatment technologies. The after-treatment technology route for non-road diesel engines is mostly composed of a series combination of an oxidation catalytic unit (DOC) / a particulate trap (DPF) / a selective catalytic reduction converter (SCR). Compared with only a silencing structure in the national III stage, both the part cost and the space occupied by the whole vehicle have changed greatly. To meet the layout requirements of the exhaust systems of tractors and harvesters, reduce the product cost, and lighten the weight of the whole vehicle, and at the same time solve the problem of high temperature on the outer surface during the after-treatment process, it is necessary to develop an after-treatment for exhaust purification of a non-road diesel engine installed vertically. Summary of the Invention

[0003] The utility model provides an after-treatment structure for exhaust purification of a non-road diesel engine, and its purpose is to solve the disadvantages of the prior art, being light in weight, small in width, having a high pollutant conversion efficiency, reducing the surface temperature of the after-treatment, and improving the installation efficiency of the whole vehicle.

[0004] The solution of the utility model to solve its technical problems lies in:

[0005] An after-treatment structure for exhaust purification of a non-road diesel engine, characterized in that:

[0006] An oxidation catalytic assembly DOC, a particulate trap assembly DPF, a mixer and a selective catalytic reduction SCR assembly are sequentially connected in sequence through a V-type clamp to form an after-treatment body. The oxidation catalytic assembly DOC includes a DOC body heat insulation cover, the particulate trap assembly DPF includes a DPF body heat insulation cover, the mixer and the selective catalytic reduction SCR include a mixer and an SCR heat insulation cover, and the outer heat insulation cover of the after-treatment is fixed to the after-treatment body by bolts;

[0007] The front end of the oxidation catalytic assembly DOC is an air inlet, and the rear end of the mixer and the selective catalytic reduction SCR assembly is an air outlet;

[0008] A temperature sensor, a nitrogen oxide sensor, and a differential pressure sensor are located on the outer heat insulation cover of the after-treatment and connect the measuring points to the after-treatment body; the nozzle is fixed to the nozzle base of the mixer and the selective catalytic reduction SCR assembly by bolts, and a urea injection pipe and a nozzle cooling pipe are connected to the nozzle.

[0009] The sensor shield is fixed to the outer heat shield of the aftertreatment by bolts. The temperature sensor, NOx sensor, and differential pressure sensor are located inside the sensor shield; the urea injection pipe and the nozzle cooling pipe are fixed to the sensor shield; the urea pipe shield is fixed to the sensor shield, and the urea injection pipe and the nozzle cooling pipe are located inside the urea pipe shield.

[0010] The temperature sensor, NOx sensor, and differential pressure sensor are respectively connected to the integrated wiring harness, and the integrated wiring harness is located above the outer heat shield of the aftertreatment. Beneficial effects

[0011] 1. The exhaust gas purification aftertreatment of the non-road diesel engine adopts the DOC+DPF+SCR technical route, which is lighter in weight and smaller in width compared to the horizontally installed aftertreatment, and is more suitable for installation on non-road vehicles such as tractors and harvesters;

[0012] 2. The intake pipe integrated on the oxidation catalytic assembly DOC can effectively reduce the length of the muffler;

[0013] 3. It has a detachable DPF, which is convenient for the vehicle to be disassembled and maintained.

[0014] 4. An outer heat shield of the aftertreatment is added and fixed on the heat shield of the aftertreatment body, forming a double-layer heat shield structure, which can effectively reduce the surface temperature of the aftertreatment and reduce the risk of igniting crops during the operation of the aftertreatment;

[0015] 5. Fixing the temperature sensor, NOx sensor, differential pressure sensor, and integrated wiring harness on the outer heat shield of the aftertreatment can reduce the surface temperature of the sensor compared to fixing on the heat shield of the aftertreatment body and reduce the risk of sensor failure due to high temperature;

[0016] 5. It has an integrated wiring harness that can integrate the wiring harnesses of each sensor into one port, and only one connector needs to be connected when connecting to the vehicle, which is more convenient for vehicle assembly and speeds up the vehicle assembly line rhythm;

[0017] 6. It has a sensor and urea pipe shield, which can reduce the risk of the sensor being knocked and damaged during vehicle operation;

[0018] 7. The aftertreatment integrates the urea injection pipe and the nozzle cooling pipe, which can avoid the problem that it is not easy to plug in the urea nozzle due to the small space inside the heat shield and improve the vehicle installation efficiency.

[0019] 8. The aftertreatment has high pollutant conversion efficiency. Description of the drawings

[0020] Figure 1 It is a schematic diagram of the aftertreatment structure viewed from the front of the intake;

[0021] Figure 2 It is a schematic diagram of the aftertreatment structure viewed from the left side of the intake;

[0022] Figure 3 It is a schematic diagram of the explosion of the main structure for post-treatment;

[0023] Figure 4 It is a schematic diagram of the sensor and wiring harness structure;

[0024] Figure 5 It is a schematic diagram of the post-treatment body structure;

[0025] Figure 6 It is a schematic diagram of the explosion of the post-treatment body structure;

[0026] Figure 7 It is a schematic diagram of the explosion of the heat shield of the post-treatment body structure. Detailed implementation manners

[0027] The following further describes the present utility model in conjunction with the accompanying drawings and specific embodiments.

[0028] To more clearly illustrate the technical solution of the present utility model, the accompanying drawings required for description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other embodiments can be obtained based on these drawings without creative efforts. To facilitate the understanding of the present utility model, the present utility model will be described in more detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] As Figure 1 、 Figure 2 shown:

[0030] The present utility model provides a post-treatment structure for exhaust purification of a non-road diesel engine.

[0031] As Figure 3 、 Figure 4 shown:

[0032] The post-treatment includes an oxidation catalytic assembly DOC1, a particulate trap assembly DPF2, a V-type clamp 3, a mixer and a selective catalytic reduction SCR assembly 4, a post-treatment outer heat shield 5, a temperature sensor 6, a nitrogen oxide sensor 7, a differential pressure sensor 8, an integrated wiring harness 9, a nozzle 10, a sensor shield 11, a urea injection pipe and a nozzle cooling pipe 12, and a urea pipe shield 13.

[0033] As Figure 5 shown:

[0034] Among them, the oxidation catalytic assembly DOC1, the particulate trap assembly DPF2, and the mixer and selective catalytic reduction SCR assembly 4 are sequentially connected in sequence through the V-type clamp 3 to form a post-treatment body, and the post-treatment outer heat shield 5 is fixed to the post-treatment body by bolts.

[0035] As Figure 4 shown:

[0036] The temperature sensor 6, nitrogen oxide sensor 7, and differential pressure sensor 8 are respectively connected to the integrated wire harness 9. The temperature sensor 6, nitrogen oxide sensor 7, differential pressure sensor 8, and integrated wire harness 9 are located on the post-treatment outer heat insulation cover 5 and connect the measurement points to the post-treatment body; the nozzle 10 is fixed to the nozzle base 403 of the mixer and selective catalytic reduction SCR assembly 4 by bolts; the sensor shield 11 is fixed to the post-treatment outer heat insulation cover 5, and the temperature sensor 6, nitrogen oxide sensor 7, and differential pressure sensor 8 are located inside the sensor shield 5; the urea injection pipe and nozzle cooling pipe 12 are connected to the nozzle 10 and then fixed to the sensor shield 11; the urea pipe shield 13 is fixed to the sensor shield 11, and the urea injection pipe and nozzle cooling pipe 12 are located inside the urea pipe shield 13.

[0037] As Figure 6 shown:

[0038] The front end of the oxidation catalytic assembly DOC1 is the air inlet 102, and the rear end of the mixer and selective catalytic reduction SCR assembly 4 is the air outlet 401. During use, the exhaust gas sequentially passes through the oxidation catalytic assembly DOC1 and the particulate trap assembly DPF2, and finally flows out from the air outlet 402 of the mixer and selective catalytic reduction SCR assembly 4. Urea injection and nozzle cooling are carried out through the urea injection pipe and nozzle cooling pipe 12, and signals such as post-treatment temperature, nitrogen oxide value, and DPF differential pressure value are collected through the integrated wire harness 9.

[0039] As Figure 6 、 Figure 7 shown:

[0040] Among them, the oxidation catalytic assembly DOC1 includes the DOC body heat insulation cover 101, the particulate trap assembly DPF2 includes the DPF body heat insulation cover 201, the mixer and selective catalytic reduction SCR 4 includes the mixer and SCR heat insulation cover 401, and combined with the post-treatment outer heat insulation cover 5, a multi-layer heat insulation structure is formed to effectively reduce the surface temperature of the post-treatment.

[0041] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An after-treatment structure for exhaust gas purification of a non-road diesel engine, characterized in that: The oxidation catalytic assembly DOC, particulate filter assembly DPF, mixer, and selective catalytic reduction SCR assembly are sequentially connected in order by V-bands to form the aftertreatment body. The oxidation catalytic assembly DOC includes a DOC body heat shield, the particulate filter assembly DPF includes a DPF body heat shield, the mixer and the selective catalytic reduction SCR include a mixer and an SCR heat shield, and the aftertreatment outer heat shield is fixed to the aftertreatment body with bolts; the front end of the oxidation catalytic assembly DOC is the air inlet, and the rear end of the mixer and the selective catalytic reduction SCR assembly is the air outlet; the temperature sensor, nitrogen oxide sensor, and differential pressure sensor are located on the aftertreatment outer heat shield and connect the measurement points to the aftertreatment body; the nozzle is fixed to the nozzle base of the mixer and the selective catalytic reduction SCR assembly with bolts, and the urea injection pipe and the nozzle cooling pipe are connected to the nozzle.

2. The post-treatment structure for exhaust gas purification of a non-road diesel engine as claimed in claim 1, wherein: The sensor shield is fixed to the aftertreatment outer heat shield with bolts, and the temperature sensor, nitrogen oxide sensor, and differential pressure sensor are located inside the sensor shield; the urea injection pipe and the nozzle cooling pipe are fixed to the sensor shield; the urea pipe shield is fixed to the sensor shield, and the urea injection pipe and the nozzle cooling pipe are located inside the urea pipe shield.

3. The post-treatment structure for exhaust gas purification of a non-road diesel engine as claimed in claim 1, wherein: The temperature sensor, nitrogen oxide sensor, and differential pressure sensor are respectively connected to the integrated wiring harness, and the integrated wiring harness is located on the aftertreatment outer heat shield.

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