Linear post-processing mixing structure

Abstract

The utility model discloses a linear post-processing mixing structure, which is characterized in that a main body on which a front cavity partition plate and a rear cavity partition plate are distributed is provided with a semicircular notch, the main body extends towards two sides to form side wings, and the side wings are connected with inclined folded edges; a rotational flow through hole is formed in the mixing pipe, and is connected with a rotational flow blade expanding outwards; the metal wire winding net is positioned in the pipe and is in brazed connection with the pipe; the pipe is welded at the lower end of the mixing pipe; the cylinder body is welded with the front cavity partition plate and the rear cavity partition plate to divide the cylinder body into a front cavity and a rear cavity; the front cavity separating plate and the rear cavity separating plate are mutually butted and welded; the mixing pipe is welded at the position of the circular cavity; a nozzle arranged on the cylinder body is communicated with the mixing pipe; the upper end of the mixing pipe is fixedly connected to the cylinder body; and the flow plate is mounted at the rear end of the rear cavity partition plate. The nitrogen oxide conversion efficiency margin of the postprocessor is improved, and meanwhile the crystallization risk is reduced.

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 a one - shaped post - treatment mixing structure. Background Technique

[0002] Since the implementation of the national VI emission regulations for diesel vehicles, the overall emissions of nitrogen oxides have been greatly reduced. The emission reduction is the result of the combined action of engine upgrades and the improvement of the performance of exhaust emission purification devices. The engine has also sacrificed some power and economy to reduce emissions. To improve product competitiveness and create greater value for customers, the exhaust emission purification device needs to improve the exhaust purification performance and provide room for performance improvement for the engine. The main pollutant reduced by the diesel engine exhaust purification device is nitrogen oxides. Increasing the urea injection amount is a necessary means, but at the same time, a urea mixing structure with higher performance is required for cooperation. Therefore, it is necessary to develop a more efficient urea - exhaust mixing structure to improve the conversion efficiency of nitrogen oxides in post - treatment while reducing the crystallization risk. Summary of the Invention

[0003] The utility model provides a one - shaped post - treatment mixing structure, aiming to solve the shortcomings of the prior art, improve the margin of nitrogen oxide conversion efficiency of the post - processor, and reduce the crystallization risk at the same time.

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

[0005] A one - shaped post - treatment mixing structure, characterized in that:

[0006] The main body of the front cavity partition has a semi - circular notch, and the main body extends outwards on both sides to form wings, and the wings are connected to inclined flanges;

[0007] The main body of the rear cavity partition has a semi - circular notch, and the main body extends outwards on both sides to form wings, and the wings are connected to inclined flanges;

[0008] The mixing pipe is provided with swirl through - holes, and the swirl through - holes are connected with outward - expanding swirl vanes;

[0009] The wire - wound mesh is located inside the pipe, and the two are brazed;

[0010] The pipe is welded to the lower end of the mixing pipe;

[0011] The cylinder covers the outer layers of the front cavity partition and the rear cavity partition, and the edges of the cylinder, the front cavity partition and the rear cavity partition are welded to each other, dividing the cylinder into a front chamber and a rear chamber;

[0012] The front cavity partition and the rear cavity partition are butt - jointed and welded, and the semi - circular notches form a circular hole, and the mixing pipe is welded at the position of the circular hole;

[0013] The nozzle installed on the cylinder body is communicated with the mixing pipe;

[0014] The upper end of the mixing pipe is fixedly connected to the cylinder body;

[0015] The spoiler plate provided with spoiler holes is installed at the rear end of the rear cavity partition plate and welded to the cylinder body.

[0016] The temperature sensor seat and the differential pressure sensor seat are installed at the front end of the front cavity partition plate and welded to the cylinder body.

[0017] The air inlet opening of the cylinder body is a flared opening with a diameter decreasing from large to small.

[0018] The nozzle mounting seat fixing plate covers the hole on the cylinder body and is welded around. The nozzle mounting seat is assembled to the nozzle mounting seat fixing plate, the nozzle is installed on the nozzle mounting seat, and the upper end of the mixing pipe is assembled to the nozzle mounting seat fixing plate and welded.

[0019] The stainless steel wound mesh is woven into the shape of wave crests and wave troughs by cylindrical stainless steel wires and then wound layer by layer.

[0020] The flanging is a single-sided flanging, or in an arc shape, or a partition plate on both sides of the mixing pipe.

[0021] The swirling through holes are evenly distributed around the circumference of the mixing pipe.

[0022] The utility model has the following beneficial effects:

[0023] 1. The utility model adopts a unique cavity structure, simplifies the structure of the mixer, reduces the welding positions, improves the accuracy and consistency of the mixing structure. Simplifying the structure can improve the production efficiency and reduce the production cost at the same time.

[0024] 2. The flanges on both sides of the cavity partition plate of the utility model can reduce the formation of dead zones of air flow on both sides, improve the energy utilization rate of the tail gas, improve the mixing effect of the tail gas and the urea solution in the mixer, and reduce the crystallization risk.

[0025] 3. The special cavity structure of the utility model can increase the diameter of the mixing pipe, increase the ventilation area, and reduce the overall back pressure. At the same time, it increases the contact area between the urea solution and the metal wire mesh assembly, improves the energy utilization rate of the tail gas, and reduces the crystallization risk.

[0026] 4. The structure of the utility model is compact in the front and rear distance, which is beneficial to increasing the distance between the mixing structure and the SCR, improving the uniformity of ammonia and the tail gas, and improving the conversion efficiency margin of nitrogen oxides in the post-processor. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] Figure 1Isometric view of the present utility model;

[0029] Figure 2 Front view of the present utility model in the intake direction;

[0030] Figure 3 Exploded isometric view of the present utility model. Detailed implementation manners

[0031] The following further describes the present utility model in conjunction with the accompanying drawings and specific embodiments.

[0032] 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.

[0033] The present utility model is a one - type post - treatment hybrid structure. The flared cylinder of the hybrid structure cooperates with the hump pipe at the rear end of the particulate trap, and the rear end is welded to the front end of the selective catalytic reduction converter.

[0034] As Figure 1 、 Figure 2 、 Figure 3 shown:

[0035] The present utility model is a one - type post - treatment hybrid structure. The front end of the flared cylinder 1 of the hybrid structure cooperates with the hump pipe at the rear end of the diesel particulate filter (DPF) through a detachable hoop structure, and the rear end of the flared cylinder 1 of the hybrid structure is welded to the front end of the selective catalytic reduction (SCR) converter.

[0036] The present utility model includes: flared cylinder 1, nozzle mounting seat 2, nozzle mounting seat fixing plate 3, mixing pipe 4, front cavity partition 5, rear cavity partition 6, spoiler 7, wire - wound mesh 8; pipe 9, temperature sensor seat 10, differential pressure sensor seat 11.

[0037] The air inlet opening of the flared cylinder 1 is a flared opening 13 with a diameter decreasing from large to small.

[0038] The main body of the front cavity partition 5 has a semi - circular notch 50, and the main body extends outwards on both sides to form wings 51, and the wings 51 are connected to inclined flanges 52.

[0039] The main body of the rear cavity partition 6 has a semi - circular notch 60, and the main body extends outwards on both sides to form wings 61, and the wings 61 are connected to inclined flanges 62.

[0040] The flanging structure of the cavity partition is an air flow guiding structure, which is not limited to the flanging shape of the embodiment shown in the present utility model, and can also be a single-sided flanging, the flanging is in an arc shape, and the same effect can also be achieved by adding partitions on both sides of the mixing tube and other structures.

[0041] The nozzle mounting seat fixing plate 3 covers the hole 12 on the flared mouth cylinder 1 and is welded around; the nozzle mounting seat 2 is assembled to the nozzle mounting seat fixing plate 3 and welded.

[0042] The mixing tube 4 is a stainless steel tube with a certain diameter, and a certain number of swirl through holes 41 are evenly distributed on the circumference. The swirl through holes 41 are connected with swirl vanes 42, and the swirl vanes 42 flare out at a certain angle.

[0043] The flared mouth cylinder 1 covers the outer layers of the front cavity partition 5 and the rear cavity partition 6. The edges of the flared mouth cylinder 1, the front cavity partition 5 and the rear cavity partition 6 are welded to each other, so that the flared mouth cylinder 1 is divided into a front cavity and a rear cavity. The flanges 52 and 62 form an air flow guiding structure.

[0044] The front cavity partition 5 and the rear cavity partition 6 are butted and welded. The semi-circular notches 50 and 60 form a circular hole, forming a necessary passage for the tail gas to flow.

[0045] The mixing tube 4 is welded at the position of the circular hole formed by the front cavity partition 5 and the rear cavity partition 6.

[0046] The center of the hole for installing the nozzle on the nozzle mounting seat 2 coincides with the center of the mixing tube 4.

[0047] The upper end of the mixing tube 4 is assembled to the nozzle mounting seat fixing plate 3 and welded.

[0048] The wire wound mesh 8 is located inside the tube 9, and the two are combined together by brazing. The wire wound mesh 8 is woven into a shape of wave peaks and wave valleys by cylindrical stainless steel wires and then wound layer by layer.

[0049] The tube 9 is welded to the lower end of the mixing tube and has a gap with the flared mouth cylinder 1 to form a passage.

[0050] The spoiler 7 provided with spoiler holes 70 is installed at a specific position at the rear end of the rear cavity partition 6 and welded to the flared mouth cylinder 1. The shape and installation position of the spoiler 7 are not limited to the shape and installation position of the spoiler 7 in the embodiment described in the present utility model.

[0051] The temperature sensor seat 10 and the differential pressure sensor seat 11 are installed at the front end of the front cavity partition 5 and welded to the flared mouth cylinder 1.

[0052] During actual application:

[0053] The tail gas enters the flared cylinder body 1. Through the air flow guiding structure formed by the flanging on both sides of the front sub-chamber partition plate 5 and the rear sub-chamber partition plate 6, the tail gas is gathered together and passes through the swirling through holes 41 of the mixing pipe 4. After passing through the swirling through holes 41, the tail gas rotates inside the mixing pipe 4. At the same time, the urea solution is sprayed into the mixing pipe 4 from the nozzle. A part of the urea solution is hydrolyzed into ammonia under the high-temperature gas, and the ammonia and the tail gas are fully mixed evenly by rotating inside the mixing pipe 4. Another part of the urea solution that is not hydrolyzed in time directly falls on the wire-wound mesh 8, and the high-temperature wire-wound mesh 8 accelerates the hydrolysis of the urea solution and reduces the crystallization risk. The mixed air flow further mixes the tail gas and ammonia evenly through the wire-wound mesh 8. After the air flow passes through the wire-wound mesh 8, it flows along the outer contours of the front sub-chamber partition plate 5 and the rear sub-chamber partition plate 6. The air flow distribution is mainly concentrated at the lower end. The special structure of the spoiler 7 is used to distribute the mixed air flow in the cross-section of the flared cylinder body 1, so that the mixed air flow is evenly distributed before reaching the selective catalytic reduction device at the rear end, improving the utilization rate of the catalytic units inside the catalytic reduction device, and thus improving the conversion efficiency.

[0054] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various 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. A linear post-processing hybrid structure, characterized in that: The main body of the front partition has a semi-circular notch, and the main body extends outwards on both sides to form flanks, and the flanks are connected to inclined flanges; the main body of the rear partition has a semi-circular notch, and the main body extends outwards on both sides to form flanks, and the flanks are connected to inclined flanges; the mixing pipe is provided with swirl through holes, and the swirl through holes are connected to outwardly expanding swirl vanes; the wire-wound mesh is located inside the pipe, and the two are brazed; the pipe is welded to the lower end of the mixing pipe; the cylinder body covers the outer layers of the front partition and the rear partition, and the edges of the cylinder body, the front partition and the rear partition are welded to each other, dividing the cylinder body into a front chamber and a rear chamber; the front partition and the rear partition are butt-jointed and welded, and the semi-circular notches form a circular cavity, and the mixing pipe is welded at the position of the circular cavity; the nozzle installed on the cylinder body is communicated with the mixing pipe; the upper end of the mixing pipe is fixedly connected to the cylinder body; the spoiler plate provided with spoiler holes is installed at the rear end of the rear partition and welded to the cylinder body.

2. The one-word post-treatment hybrid structure according to claim 1, wherein: The air inlet opening of the cylinder body is a flared opening with a diameter decreasing from large to small.

3. The one-shaped post-treatment hybrid structure according to claim 1, wherein: The nozzle mounting seat fixing plate covers the holes on the cylinder body and is welded around, the nozzle mounting seat is assembled to the nozzle mounting seat fixing plate, the nozzle is installed on the nozzle mounting seat, and the upper end of the mixing pipe is assembled to the nozzle mounting seat fixing plate and welded.

4. The one - shaped post - processing hybrid structure according to claim 1, characterized in that: The stainless steel wire-wound mesh is woven into a shape with wave crests and wave troughs by cylindrical stainless steel wires and then wound layer by layer.

5. The one - shaped post - treatment hybrid structure according to claim 1, wherein: The flange is a single-sided flange, or has an arc shape, or is a partition on both sides of the mixing pipe.

6. The one - shaped post - processing hybrid structure according to claim 1, characterized in that: The swirl through holes are evenly distributed in a circumferential direction on the mixing pipe.

7. A one - shaped post - treatment hybrid structure as described in claim 1, characterized in that: The temperature sensor seat and the differential pressure sensor seat are installed at the front end of the front partition and welded to the cylinder body.

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