An engine exhaust pipe integrated with a post-processing nitrogen oxygen sensor

Abstract

The utility model discloses an engine exhaust pipe of integrated post-processing nitrogen oxygen sensor installation belongs to engine exhaust post-processing system technical field, and this exhaust pipe includes flange, and the fixed connection reducing pipe with flange, and the nitrogen oxygen sensor mounting seat fixed in the outer wall of reducing pipe, and the U type rainproof board covered in the top of mounting seat and the drain hole of setting in the bottom of reducing pipe, and the above -mentioned components constitute the exhaust module of whole dismounting from the post-processing system through flange in common, and the connecting place of pipe body and flange is higher than the sealing plane of flange, forms the shoulder formula physical barrier to prevent the back flow. The utility model discloses through modularization design, and the sensor dismounting work is shifted to the spacious room from the narrow cabin, has simplified the maintenance process, has shortened the maintenance time, and simultaneously, through rainproof board, drain hole and anti -back flow structure, has effectively protected sensor and post-processing system, has promoted the reliability and the service life of overall operation.

Description

Technical Field

[0001] This utility model relates to the technical field of engine exhaust aftertreatment systems, and in particular to an engine exhaust pipe with an integrated aftertreatment nitrogen and oxygen sensor. Background Technology

[0002] With increasing global emphasis on environmental protection, vehicle emission regulations are becoming increasingly stringent. To meet these stringent emission standards, modern diesel engines are generally equipped with selective catalytic reduction (SCR) systems, which neutralize nitrogen oxides (NOx) in the exhaust gas by injecting urea solution into the exhaust.

[0003] To achieve precise control over the urea injection quantity and thus ensure high efficiency of the catalytic reduction reaction, the SCR system must monitor the nitrogen oxide concentration in the exhaust gas in real time. This monitoring task is performed by a nitrogen oxide sensor installed on the exhaust pipe. Therefore, the nitrogen oxide sensor is one of the key components for the stable and efficient operation of the entire aftertreatment system.

[0004] In existing technical solutions, nitrogen oxide sensors are typically screwed directly into a mounting bracket fixed to the wall of the engine exhaust pipe. However, due to the compact layout of the engine compartment, which is filled with the engine body, various pipelines, and auxiliary components, the installation space for the exhaust pipe and the nitrogen oxide sensor on it is often very narrow, with extremely limited surrounding operating space.

[0005] When nitrogen-oxygen sensors need repair or replacement due to malfunction or reaching the end of their service life, the shortcomings of this installation structure become apparent. Maintenance personnel must reach into a confined space and use specialized tools to disassemble and install the sensors. This process is not only cumbersome and time-consuming, but also highly susceptible to damage to the sensor itself or other precision components due to limited visibility or difficulty in using the tools.

[0006] Therefore, this utility model proposes an engine exhaust pipe with an integrated after-treatment nitrogen and oxygen sensor to address the shortcomings of the prior art. Utility Model Content

[0007] To overcome the above shortcomings, this utility model provides an engine exhaust pipe with an integrated aftertreatment nitrogen-oxygen sensor, which aims to improve the problems of insufficient space for maintenance or replacement, long time consumption, and easy damage to components caused by the fact that the nitrogen-oxygen sensor of the existing engine exhaust pipe is usually installed in a narrow engine compartment.

[0008] To achieve the above objectives, this utility model adopts the following technical solution: an engine exhaust pipe with an integrated aftertreatment nitrogen-oxygen sensor, comprising: a flange, and a pipe body fixedly connected to the flange; and a reducing pipe, a nitrogen-oxygen sensor mounting base, a U-shaped rainproof plate, and a drain hole. The thicker end of the reducing pipe is fixedly connected to the flange, and the reducing pipe and the flange are fixed by welding. The nitrogen-oxygen sensor mounting base and the U-shaped rainproof plate are both fixed to the outer wall of the reducing pipe. The drain hole is opened on the pipe wall of the reducing pipe. The pipe body, the reducing pipe, the nitrogen-oxygen sensor mounting base, and the U-shaped rainproof plate are all fixed to the flange. The flanges are assembled according to the following spatial relationship: the diameter of the reducer gradually narrows from one end closer to the pipe body to the other end farther away from the pipe body; the nitrogen-oxygen sensor mounting base is a cylindrical structure with internal threads, and the axis of the nitrogen-oxygen sensor mounting base intersects the pipe wall of the reducer at an incline; the opening of the U-shaped rainproof plate faces downward and covers the top of the nitrogen-oxygen sensor mounting base; the drain hole is opened on the pipe wall of the reducer near its lowest point; the connection between the pipe body and the flange is higher than the sealing plane of the flange used for docking, so as to form a shoulder-type physical barrier.

[0009] Preferably, the pipe body and the flange are integrally formed.

[0010] Preferably, the flange is an annular structure, and the flange has through holes for the connecting bolts to pass through.

[0011] Preferably, the U-shaped rainproof plate is fixed to the outer wall of the reducing pipe by welding.

[0012] Preferably, the width of the U-shaped rainproof plate is greater than the outer diameter of the nitrogen and oxygen sensor mounting base.

[0013] Preferably, the number of drainage holes is at least two, and they are evenly distributed along the circumference of the variable diameter pipe.

[0014] Preferably, the connection between the pipe body and the reducing pipe is welding.

[0015] Preferably, the pipe body, the reducing pipe, the U-shaped rainproof plate, the flange, and the nitrogen oxide sensor mounting base together constitute an exhaust module that can be completely detached from the engine aftertreatment system.

[0016] This utility model has the following beneficial effects: 1. This utility model integrates the pipe body, reducing pipe, nitrogen and oxygen sensor mounting base and flange into an independent exhaust module that can be disassembled through the flange. This solves the problem in the prior art that the nitrogen and oxygen sensor is difficult to maintain and replace due to being installed in a narrow engine compartment, which is time-consuming and easy to damage the components. It achieves the effect of simplifying the maintenance process, greatly shortening the maintenance time and improving the maintenance safety.

[0017] 2. This utility model solves the problem that nitrogen and oxygen sensor probes are easily damaged by rain, foreign object impacts, and corrosion from liquid accumulation inside the pipe, thus causing premature failure. It provides comprehensive physical protection for the sensor, ensures its long-term stable operation, and extends its service life. Attached Figure Description

[0018] Figure 1 This is a perspective view of an engine exhaust pipe with an integrated after-treatment nitrogen and oxygen sensor installed, as proposed in this utility model. Figure 2 This is a schematic diagram of a variable diameter pipe for an engine exhaust pipe with an integrated after-treatment nitrogen and oxygen sensor installed, as proposed in this utility model. Figure 3 for Figure 2 Enlarged view of point A in the image; Figure 4 This is a schematic diagram of a U-shaped rainproof plate for an engine exhaust pipe with an integrated aftertreatment nitrogen and oxygen sensor, as proposed in this utility model.

[0019] Legend: 1. Reducing pipe; 2. U-shaped rainproof plate; 3. Flange; 4. Pipe body; 5. Nitrogen and oxygen sensor mounting base; 6. Drain hole. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Reference Figures 1-4This utility model provides an embodiment of an engine exhaust pipe with an integrated after-treatment nitrogen-oxygen sensor. The exhaust pipe includes a flange 3, a pipe body 4, a reducer 1, a nitrogen-oxygen sensor mounting base 5, a U-shaped rainproof plate 2, and a drain hole 6 on the reducer 1. These components together form an exhaust module that can be completely detached from the engine after-treatment system. The flange 3 has an annular structure and a through hole for connecting bolts to pass through, enabling a detachable connection with the engine after-treatment system. One end of the pipe body 4 is fixedly connected to the flange 3. In one specific embodiment, the pipe body 4 and the flange 3 are integrally formed, and the connection point between the pipe body 4 and the flange 3 is higher than the sealing plane of the flange 3 used for docking, forming a shoulder-like physical barrier. The thicker end of the reducer 1 is connected to the flange... 3. Welding and fixing: The diameter of the reducing pipe 1 gradually narrows from the end of the reducing pipe 1 near the pipe body 4 to the other end of the reducing pipe 1 away from the pipe body 4. The nitrogen-oxygen sensor mounting base 5 is fixed to the outer wall of the reducing pipe 1. The nitrogen-oxygen sensor mounting base 5 is a cylindrical structure with internal threads, and the axis of the nitrogen-oxygen sensor mounting base 5 intersects the pipe wall of the reducing pipe 1 at an inclination. The U-shaped rainproof plate 2 is fixed to the outer wall of the reducing pipe 1 by welding. The opening of the U-shaped rainproof plate 2 faces downward and covers the top of the nitrogen-oxygen sensor mounting base 5. The width of the U-shaped rainproof plate 2 is greater than the outer diameter of the nitrogen-oxygen sensor mounting base 5. Drainage holes 6 are provided on the pipe wall of the reducing pipe 1 near its lowest point. There are at least two drainage holes 6, which are evenly distributed along the circumference of the reducing pipe 1. The nitrogen-oxygen sensor mounting base 5 provides an interface for screwing in the nitrogen-oxygen sensor through a cylindrical structure with internal threads. The mounting base 5 is fixed to the outer wall of the reducer 1 with its axis intersecting the wall of the reducer 1 at an angle. This angled installation allows the installed nitrogen-oxygen sensor probe to extend into the central airflow area inside the reducer 1. The U-shaped rainproof plate 2 is firmly fixed to the outer wall of the reducer 1 by welding, and its position is directly above the nitrogen-oxygen sensor mounting base 5. The opening of the U-shaped rainproof plate 2 faces downwards, and its width is greater than the outer diameter of the nitrogen-oxygen sensor mounting base 5, effectively preventing obstruction of exhaust gas flow. To prevent rainwater from directly wetting the nitrogen-oxygen sensor probe installed in the nitrogen-oxygen sensor mounting base 5 or foreign objects such as metal shavings from impacting it, at the same time, at least two drainage holes 6 are provided on the pipe wall near the lowest point of the reducer pipe 1 and are evenly distributed around the circumference of the reducer pipe 1. This bottom drainage structure uses gravity to promptly discharge any rainwater or condensate that enters the reducer pipe 1, preventing liquid accumulation from affecting the exhaust back pressure or corroding and damaging the sensor and pipeline. In addition, the connection between the pipe body 4 and the flange 3 is higher than the sealing plane of the flange 3 used for docking, forming a shoulder-like physical barrier, which structurally prevents external liquid from flowing back into the engine aftertreatment system through the flange 3 interface. To enhance the overall structural strength and sealing performance, the pipe body 4 and flange 3 are integrally formed. The flange 3 has a ring structure with through holes for connecting bolts. To ensure the firmness of the connection between components and the airtightness of the exhaust channel, the U-shaped rainproof plate 2 is fixed to the outer wall of the reducing pipe 1 by welding. The flange 3 and the reducing pipe 1 are also connected by welding. To ensure effective shielding of the nitrogen and oxygen sensor, the width of the U-shaped rainproof plate 2 is designed to be greater than the outer diameter of the nitrogen and oxygen sensor mounting base 5, so that the U-shaped rainproof plate 2 can completely cover the nitrogen and oxygen sensor mounting base 5 and the nitrogen and oxygen sensor connector installed inside from directly above. To achieve efficient and thorough drainage, at least two drainage holes 6 are provided at the bottom of the reducing pipe 1, and these at least two drainage holes 6 are evenly distributed along the circumference of the reducing pipe 1.

[0022] Working principle: In operation, the exhaust gas from the engine is treated by the aftertreatment system and then enters the pipe body 4 through flange 3. Since the connection between the pipe body 4 and flange 3 is higher than the sealing plane of flange 3, the resulting shoulder-like physical barrier prevents external liquid from flowing back through the flange 3 interface. The exhaust gas then flows into the reducer 1. The structure of the reducer 1, which gradually narrows from bottom to top, smoothly guides the airflow to the subsequent pipeline. At the same time, the nitrogen oxide sensor installed in the nitrogen oxide sensor mounting base 5 has its probe inserted into the central airflow area inside the reducer 1 to monitor the concentration of nitrogen oxides in the exhaust gas in real time. During this process, the U-shaped rainproof plate 2, which is welded and fixed to the outer wall of the reducer 1 and covers the nitrogen oxide sensor mounting base 5, can prevent rainwater from directly wetting the nitrogen oxide sensor probe or foreign objects from hitting it. If rainwater or condensate enters the reducer 1, it will collect at the lowest point near the bottom of the reducer 1 and be discharged in time through the drain holes 6 that are evenly distributed around the circumference of the reducer 1. When maintenance or replacement of the nitrogen oxide sensor is required, the operator does not need to disassemble the sensor separately in the confined engine compartment. Instead, the operator can simply loosen the connecting bolts that fix the flange 3 to the engine aftertreatment system, and remove the entire exhaust module, which consists of the reducer 1, U-shaped rain guard 2, flange 3, pipe body 4, nitrogen oxide sensor mounting base 5, and the installed nitrogen oxide sensor, as an independent unit. In the spacious operating area, the old nitrogen oxide sensor can be easily unscrewed from the nitrogen oxide sensor mounting base 5 and replaced with a new one. After replacement, the entire exhaust module can be reconnected to the aftertreatment system through flange 3, and the connecting bolts can be tightened to restore its use.

Claims

1. An engine exhaust pipe with an integrated aftertreatment nitrogen oxide sensor, comprising: Flange (3) and pipe body (4), wherein the pipe body (4) is fixedly connected to the flange (3); Its characteristic is that it further includes: A reducing pipe (1) is fixedly connected to a flange (3) at its thicker end. The reducing pipe (1) and the flange (3) are fixed by welding. The diameter of the reducing pipe (1) gradually shrinks from the end closer to the pipe body (4) to the end further away from the pipe body (4). Nitrogen oxygen sensor mounting base (5), the nitrogen oxygen sensor mounting base (5) is fixed to the outer wall of the variable diameter pipe (1), the nitrogen oxygen sensor mounting base (5) is a cylindrical structure with internal threads, and the axis of the nitrogen oxygen sensor mounting base (5) intersects the pipe wall of the variable diameter pipe (1) at an inclination. U-shaped rainproof plate (2), the U-shaped rainproof plate (2) is fixed to the outer wall of the reducing pipe (1), the opening of the U-shaped rainproof plate (2) faces downward and covers the top of the nitrogen and oxygen sensor mounting base (5); Drainage hole (6) is provided on the pipe wall near the lowest point of the bottom of the reducing pipe (1). The connection between the pipe body (4) and the flange (3) is higher than the sealing plane of the flange (3) for docking, so as to form a shoulder-type physical barrier.

2. The engine exhaust pipe with an integrated aftertreatment nitrogen oxide sensor as described in claim 1, characterized in that: The pipe body (4) and the flange (3) are integrally formed.

3. The engine exhaust pipe with an integrated aftertreatment nitrogen oxide sensor as described in claim 1, characterized in that: The flange (3) is an annular structure, and the flange (3) has through holes for the connecting bolts to pass through.

4. An engine exhaust pipe with an integrated aftertreatment nitrogen oxide sensor as described in claim 1, characterized in that: The U-shaped rainproof plate (2) is fixed to the outer wall of the reducing pipe (1) by welding.

5. An engine exhaust pipe with an integrated aftertreatment nitrogen oxide sensor as described in claim 1, characterized in that: The width of the U-shaped rainproof plate (2) is greater than the outer diameter of the nitrogen and oxygen sensor mounting base (5).

6. An engine exhaust pipe with an integrated aftertreatment nitrogen oxide sensor as described in claim 1, characterized in that: The number of drainage holes (6) is at least two, and they are evenly distributed along the circumference of the variable diameter pipe (1).

7. An engine exhaust pipe with an integrated aftertreatment nitrogen oxide sensor as described in claim 1, characterized in that: The connection between the pipe body (4) and the reducing pipe (1) is by welding.

8. An engine exhaust pipe with an integrated aftertreatment nitrogen oxide sensor as described in claim 1, characterized in that: The pipe body (4), the reducing pipe (1), the U-shaped rainproof plate (2), the flange (3), and the nitrogen oxygen sensor mounting base (5) together constitute an exhaust module that can be completely disassembled from the engine aftertreatment system.

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