CN214403716U

CN214403716U - Diesel engine urea mixer with inclined air inlet pipe

Info

Publication number: CN214403716U
Application number: CN202023048850.9U
Authority: CN
Inventors: 蔡龙
Original assignee: Jiangsu Vocational College of Information Technology
Current assignee: WUXI AILITE ENGINEERING EQUIPMENT Co.,Ltd.
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-10-15
Anticipated expiration: 2030-12-17

Abstract

The utility model discloses a diesel engine urea blender of intake pipe slope aims at providing the diesel engine urea blender of an intake pipe slope, and its technical scheme main points are: including the urea sprayer, urea sprayer end connection installs the injection base, and injection base ground fixed mounting has the end cover, and the inside shell that is equipped with the cavity body is connected to the end cover below, and the turn-ups welding of shell has the slope straight tube that admits air, and end cover center department is equipped with the mixed pore pipe of whirl, and the mixed pore pipe of whirl is close to end cover one side and is equipped with three rectangular breach, and is three the size of breach is 40mm 8mm, and the axis of the mixed pore pipe of whirl is certain contained angle with the axis of the slope straight tube of admitting air, and the control range of contained angle is 75 to 60.

Description

Diesel engine urea mixer with inclined air inlet pipe

Technical Field

The utility model relates to a tail gas treatment technical field, in particular to diesel engine urea blender of intake pipe slope.

Background

With the gradual implementation of the fifth and sixth stage diesel engine exhaust emission limiting value standard in China, a Selective Catalytic Reduction (SCR) system using ammonia as a reducing agent gradually becomes a system for reducing Nitrogen Oxides (NO) for various whole automobile factories, engine factories and aftertreatment suppliers_X) The main technical route of (1). Ammonia (NH) decomposed from urea under the catalysis of catalyst₃) With Nitrogen Oxides (NO) in engine exhaust_X) Oxidation-reduction reaction to produceNitrogen (N)₂) And water (H)₂O) to reduce NO_XAnd (4) emission, which meets the emission requirements of more than five countries and six countries.

The key technology of the SCR system lies in improving NH₃The uniformity of mixing with the exhaust gas, and the risk of urea crystallization is reduced. The existing urea mixer is usually limited by the layout of a finished automobile exhaust emission device when considering matching with the layout of the finished automobile, thereby influencing the flow field distribution of an exhaust system and an exhaust aftertreatment device, and further decomposing NH₃With NO in the exhaust gases_XThe mixing uniformity is low and the risk of urea crystallization is increased, resulting in NO_XThe conversion efficiency is low, thereby affecting the emission level of the whole vehicle. NO control in the national fifth and sixth emission regulations_XHigher requirements are provided for emission limit values, so that the urea mixer of the existing SCR system is required to improve the mixing effect of urea solution and tail gas, the urea crystallization risk is reduced to the minimum, and the requirements of whole vehicle layout, compact structure and simple form are met.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a diesel engine urea blender of intake pipe slope, it has NH₃Has good mixing effect with waste gas, low risk of urea crystallization, compact structure, simplicity and reliability, and can adapt to the layout of the tail gas discharge system of the whole vehicle to ensure the Nitrogen Oxide (NO) of the diesel vehicle_X) The emission meets the emission standards of the fifth and sixth countries.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides a diesel engine urea blender of intake pipe slope, includes the urea sprayer, urea sprayer end connection installs and sprays the base, it has the end cover to spray base ground fixed mounting, the inside shell that is equipped with the cavity body is connected to the end cover below, the turn-ups welding of shell has the slope straight tube of admitting air, end cover center department is equipped with whirl mixing hole pipe, whirl mixing hole pipe is close to end cover one side and is equipped with three rectangular breach, and is three the size of breach is 40mm 8mm, the axis of whirl mixing hole pipe is certain contained angle with the axis of the slope straight tube of admitting air, the adjustment range of contained angle is 75 to 60.

By adopting the technical scheme, the tail gas airflow of the engine enters the cyclone mixer through the air inlet inclined straight pipe, and a part of the airflow enters the cyclone mixing hole pipe through the diversion of the cyclone blades and is strongly rotated in the cyclone mixing hole pipe; the other part of the air flow enters the rotational flow mixing hole pipe through the small hole, the throttling function of the small hole improves the air flow speed, and strong turbulence is formed in the rotational flow mixing hole pipe. The sprayer just in time spouts the central axis department of whirl mixing hole pipe with urea solution, and like this, urea solution takes place to mix with the air current of violent movement fast, avoids urea solution direct injection to the wall of mixing tube, reduces urea crystallization risk. After the airflow is fully mixed with the urea solution, the airflow flows out from the left end of the rotational flow mixing hole pipe, passes through an SCR catalyst carrier, and ammonia (NH) decomposed from the urea solution in China under the action of a catalyst₃) With Nitrogen Oxides (NO) in engine exhaust_X) The reduction reaction is carried out, and the purpose of purifying the tail gas is achieved. The right end of the rotational flow mixing hole pipe 6 is provided with three rectangular gaps, and the size of each gap is 40mm x8 mm; a part of air current can directly get into the rotational flow mixing pipe through the breach, form high-speed air current from right to left, and this high-speed air current can make urea solution that just has followed urea sprayer 1 spun, keeps away from urea nozzle exit rapidly to avoid urea solution and rotational flow mixing hole pipe 6 to take place to bump the wall, avoided urea solution to take place to crystallize in the nozzle exit.

Further setting: two end faces of the rotational flow mixing hole pipe are straight, 6 to 14 rotational flow blades are arranged on one side far away from the end cover, and the length of the rotational flow mixing hole pipe is 80-100 mm; one side close to the end cover is provided with small holes with the diameter of phi 6 to phi 12, and the small holes are distributed into 3 rows and 10 rows.

By adopting the technical scheme, a part of air flow enters the rotational flow mixing hole pipe through the flow guide of the rotational flow blades and is strongly rotated in the rotational flow mixing hole pipe; the other part of the air flow enters the rotational flow mixing hole pipe through the small hole, the throttling function of the small hole improves the air flow speed, and strong turbulence is formed in the rotational flow mixing hole pipe.

Further setting: the diameter of the rotational flow mixing hole pipe is slightly smaller than the inner diameter of the outlet at the left end of the shell.

Through adopting above-mentioned technical scheme, the inflow of the gas of being convenient for.

Further setting: the diameter of the annular supporting plate is slightly larger than the inner diameter of the rotational flow mixing hole pipe.

Through adopting above-mentioned technical scheme, can connect the mixed pore pipe of whirl more stably.

Further setting: the rotational flow mixing hole pipe is formed in one step by precisely casting a stainless steel material.

By adopting the technical scheme, the method has the advantages that,

further setting: the spiral-flow mixing hole pipe is connected with the annular supporting plate and the end cover in a welding mode, and the urea injector is fixedly connected with the injection base through three bolts.

Through adopting above-mentioned technical scheme, the materials and the connected mode of whole blender are reliable stable, can increase of service life, reduce the damage.

To sum up, the utility model discloses following beneficial effect has: the rotational flow mixing hole pipe is adopted, and airflow can rotate strongly when entering the mixing pipe through the rotational flow blades and the small holes, so that the urea solution entering the mixing pipe is fully mixed with the engine tail gas, and the mixing effect is good; the urea solution is directly sprayed to the center of the airflow of the rotational flow mixing hole pipe by the sprayer, so that the urea solution can be prevented from colliding the wall, and the risk of urea crystallization is reduced; three rectangular gaps are formed at the right end of the rotational flow mixing hole pipe, so that urea crystals can be prevented from appearing on the inner wall surface of the right end of the mixing pipe and at the outlet of the nozzle; the air inlet inclined straight pipe and the axis of the shell form a certain included angle, the range of the included angle can be flexibly adjusted according to the layout of an exhaust system of the whole vehicle, and the air inlet inclined straight pipe is suitable for different vehicle types.

Drawings

FIG. 1 is a schematic side view of a urea mixer;

FIG. 2 is a schematic diagram of the overall structure of the urea mixer.

In the figure, 1, urea injector; 2. a spray base; 3. an end cap; 4. an intake inclined straight pipe; 5. a housing; 6. a swirl mixing orifice tube; 7. annular backup pad.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The utility model provides a diesel engine urea blender of intake pipe slope, as shown in figure 1, figure 2, including urea sprayer 1, 1 end connection of urea sprayer

installs injection base

2, and 2 ground fixed mounting of injection base have an end cover 3, and the inside shell 5 that is equipped with the cavity body is connected to end cover 3 below, the turn-ups welding of shell 5 has the slope straight tube 4 that admits air. A rotational flow mixing hole pipe 6 is arranged at the center of the end cover 3, two end faces of the rotational flow mixing hole pipe 6 are straight, 6 to 14 rotational flow blades are arranged on one side far away from the end cover 3, and the length is 80-100 mm; and small holes with the diameter of phi 6 to phi 12 are arranged on one side close to the end cover 3, and the small holes are distributed into 3 rows and 10 rows. Three rectangular notches are arranged on one side, close to the end cover 3, of the rotational flow mixing hole pipe 6, the size of each notch is 40mm x8mm, the axis of the rotational flow mixing hole pipe 6 and the axis of the air inlet inclined straight pipe 4 form a certain included angle, and the adjustment range of the included angle is 75-60 degrees.

The rotational flow mixing hole pipe 6 is formed by punching, rounding, cutting and punch forming of a stainless steel plate, burrs are polished smoothly, and the rotational flow mixing hole pipe can also be formed in one step by using stainless steel materials and precision casting. The end cover 3, the air inlet inclined straight pipe 4, the shell 5 and the annular supporting plate 7 are all formed by stamping, cutting and welding stainless steel plates.

The air inlet inclined straight pipe 4 is welded with a flange of the shell 5, a flange of the end cover 3 is welded with the shell 5, the rotational flow mixing hole pipe 6 is welded with the annular supporting plate 7 and the end cover 3, the annular supporting plate 7 is welded with the shell 5 and the rotational flow mixing hole pipe 6, the injection base 2 is welded with the end cover 3, and the injector is fixedly connected with the injection base 2 through three bolts.

The main working principle is as follows:

the tail gas airflow of the engine enters the cyclone mixer through the intake inclined straight pipe 4, and a part of the airflow enters the cyclone mixing hole pipe 6 through the diversion of the cyclone blades and generates strong rotation in the cyclone mixing hole pipe 6; the other part of the air flow enters the rotational flow mixing hole pipe 6 through the small hole, and the throttling function of the small hole ensures the speed of the air flowAnd the strong turbulence is formed in the swirl mixing hole pipe 6. The sprayer just in time spouts the central axis department of whirl mixing orifice pipe 6 with urea solution, and like this, urea solution takes place to mix with the air current of violent movement fast, avoids urea solution direct injection to the wall of mixing tube, reduces urea crystallization risk. After the airflow is fully mixed with the urea solution, the airflow flows out from the left end of the rotational flow mixing hole pipe 6, passes through an SCR catalyst carrier, and ammonia (NH) decomposed from the urea solution in China under the action of a catalyst₃) With Nitrogen Oxides (NO) in engine exhaust_X) The reduction reaction is carried out, and the purpose of purifying the tail gas is achieved. The right end of the rotational flow mixing hole pipe 6 is provided with three rectangular gaps, and the size of each gap is 40mm x8 mm; a part of air current can directly get into the rotational flow mixing pipe through the breach, form high-speed air current from right to left, and this high-speed air current can make urea solution that just has followed urea sprayer 1 spun, keeps away from urea nozzle exit rapidly to avoid urea solution and rotational flow mixing hole pipe 6 to take place to bump the wall, avoided urea solution to take place to crystallize in the nozzle exit.

The above-mentioned embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the present invention.

Claims

1. A diesel engine urea mixer with inclined air inlet pipe comprises a urea injector (1), and is characterized in that: urea sprayer (1) end connection installs injection base (2), injection base (2) bottom surface fixed mounting has end cover (3), inside shell (5) that are equipped with the cavity body are connected to end cover (3) below, the turn-ups welding of shell (5) has slope straight tube (4) of admitting air, end cover (3) center department is equipped with whirl mixing hole pipe (6), whirl mixing hole pipe (6) are close to end cover (3) one side and are equipped with three rectangular breach, three the size of breach is 40mm 8mm, the axis of whirl mixing hole pipe (6) is certain contained angle with the axis of slope straight tube (4) of admitting air, the adjustment range of contained angle is 75 to 60.

2. The diesel urea mixer with inclined inlet pipe as set forth in claim 1, wherein: two end faces of the rotational flow mixing hole pipe (6) are straight, 6 to 14 rotational flow blades are arranged on one side far away from the end cover (3), and the length is 80-100 mm; small holes with the diameter of phi 6 to phi 12 are arranged on one side close to the end cover (3), and the small holes are arranged in 3 rows and 10 rows.

3. The diesel urea mixer with inclined inlet pipe as set forth in claim 1, wherein: the diameter of the rotational flow mixing hole pipe (6) is slightly smaller than the inner diameter of the outlet at the left end of the shell (5).

4. The diesel urea mixer with inclined inlet pipe as set forth in claim 1, wherein: the urea spraying device is characterized in that the rotational flow mixing hole pipe (6) is connected with the annular supporting plate (7) and the end cover (3) in a welding mode, and the urea spraying device (1) is fixedly connected with the spraying base (2) through three bolts.

5. The diesel urea mixer with inclined inlet pipe as set forth in claim 1, wherein: the rotational flow mixing hole pipe (6) is formed in one step by precisely casting a stainless steel material.

6. The diesel urea mixer with inclined inlet pipe as set forth in claim 4, wherein: the diameter of the annular support plate (7) is slightly larger than the inner diameter of the rotational flow mixing hole pipe (6).