CN214741574U

CN214741574U - Spiral-flow type mixer for purifying automobile exhaust

Info

Publication number: CN214741574U
Application number: CN202121527809.1U
Authority: CN
Inventors: 李平; 汤琪林; 李先维; 杜浩; 黄育明; 蔡同祥; 祝彦寿
Original assignee: Hubei Luotefu Environmental Protection Equipment Co ltd
Current assignee: Hubei Luotefu Environmental Protection Equipment Co ltd
Priority date: 2021-07-06
Filing date: 2021-07-06
Publication date: 2021-11-16
Anticipated expiration: 2031-07-06

Abstract

The utility model discloses a spiral-flow type mixer for purifying automobile exhaust, which is arranged in an automobile exhaust purifying device, the shell is provided with a novel spiral-flow type structure comprising a first air inlet spiral-flow pipe and a second air inlet spiral-flow pipe, so that tail gas and urea aqueous solution are uniformly mixed, the problem of crystallization of the urea solution in a mixer can be greatly reduced, the back pressure is low, the tail gas is uniformly mixed with the urea solution and the urea solution passes through the flow guide holes of the spiral-flow partition plate, the filling takes place the pyrolysis near steel ring silk screen and produces the ammonia, makes tail gas homogeneous mixing ammonia, again through offering the semicircle groove in the end one side of giving vent to anger dorsad, offer the venthole pipe of venthole on end one side and the bottom plate of giving vent to anger towards and carry out the rectification to the mixed gas flow that comes down from the steel ring silk screen, the mixed gas flow leaves the spiral-flow mixer through the air current distributor at last, has guaranteed the speed homogeneity of mixed gas flow and the homogeneity of mixed ammonia before getting into the SCR system.

Description

Spiral-flow type mixer for purifying automobile exhaust

Technical Field

The utility model relates to an automobile exhaust handles technical field. More specifically, the utility model relates to a spiral-flow mixer for automobile exhaust purifies.

Background

With the increasing demand of industrial development, the number of diesel vehicles is gradually increased every year, and the exhaust pollution caused by exhaust emission is more and more. In order to deal with the pollution of the automobile exhaust, the state has made relevant policies, and along with the stricter and stricter national regulations, the requirements on the automobile exhaust purification device are also stricter and stricter. The SCR technical route is taken as an effective measure for reducing the content of nitrogen oxides (NOx) in automobile exhaust and is adopted by most manufacturers, in the SCR technical route, particulate matter components in the exhaust are firstly filtered by a DPF carrier, a urea solution is injected into a mixer by a urea pump and is atomized and converted into ammonia in the mixer, and the ammonia reacts with the NOx in the exhaust after the particulate matters are filtered under the action of an SCR catalyst to generate nitrogen and water.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a spiral-flow type blender for automobile exhaust purifies to the blender that solves among the prior art produces the backpressure and big and influence the technical problem of the mixing efficiency of ammonia and tail gas.

To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a swirl mixer for automobile exhaust gas purification, comprising:

the cyclone separator divides the inner part of the shell into an upper cavity and a lower cavity, a flow guide hole is formed in the cyclone separator, an air inlet end communicated with the upper cavity is arranged at the upper end of the shell, an air outlet end communicated with the lower cavity is arranged at the lower end of the shell, and an air flow distributor is arranged on the air outlet end;

the first air inlet rotational flow pipe is of a cylindrical structure and is vertically arranged in the upper chamber, and a urea nozzle is arranged in the top of the shell towards the first air inlet rotational flow pipe;

the second air inlet cyclone tube is of a cylindrical structure and is connected and arranged between the first air inlet cyclone tube and the cyclone partition plate, the upper end of the second air inlet cyclone tube is communicated with the inside of the first air inlet cyclone tube, and the lower end of the second air inlet cyclone tube is communicated with the flow guide hole;

the air outlet pipe is vertically arranged in the lower cavity and is uniformly provided with air outlets;

the steel ring silk screen, its level sets up and connects between air outlet pipe and whirl baffle, and the air current gets into in the air outlet pipe after steel ring silk screen from the water conservancy diversion hole downwards.

Preferably, the first air inlet cyclone tube is of a vertically arranged cylindrical structure, one side of the first air inlet cyclone tube, which faces away from the air inlet end, and one side of the first air inlet cyclone tube, which faces towards the air inlet end, are arranged to be plane structures which are parallel to each other, wherein an air inlet groove is formed in the plane structure which faces away from the air inlet end, first flanging grooves which are used for guiding air flow are formed in the plane structure which faces towards the air outlet end and the rest of the side faces of the first air inlet cyclone tube along the circumference, a slope is connected and arranged between each plane structure and the bottom of the corresponding side of the first air inlet cyclone tube, an air inlet hole is formed in each slope, a plurality of second flanging grooves are formed in the upper end of the second air inlet cyclone tube along the circumference, and the rotational directions of the second flanging grooves are consistent with the rotational direction of the first flanging grooves.

Preferably, the air inlet groove, the first flanging groove and the first flanging groove are all vertically arranged rectangular structures.

Preferably, the first flanging groove, the slope surface and the second flanging groove are opposite to the air inlet end.

Preferably, the gas outlet pipe is provided with a semicircular arc groove at one side back to the gas outlet end, the bottom of the gas outlet pipe is covered with a bottom plate, and the gas outlet holes are respectively and uniformly formed in one side facing the gas outlet end and the bottom plate of the gas outlet pipe.

Preferably, the casing includes the drain pan, and one side opening of drain pan, opening lid close and are provided with the apron, the end of giving vent to anger is seted up respectively at the upper and lower both ends of apron with giving vent to anger, makes on the whole the casing is the U type structure of level setting.

Preferably, the airflow distributor is a plate-shaped structure with meshes distributed on the surface.

The utility model discloses at least, include following beneficial effect: the spiral-flow type mixer for purifying the automobile exhaust is arranged in the automobile exhaust purifying device, the shell is provided with a novel spiral-flow type structure comprising a first air inlet spiral-flow pipe and a second air inlet spiral-flow pipe, so that tail gas and urea aqueous solution are uniformly mixed, the problem of crystallization of the urea solution in a mixer can be greatly reduced, the back pressure is low, the tail gas is uniformly mixed with the urea solution and the urea solution passes through the flow guide holes of the spiral-flow partition plate, the filling takes place the pyrolysis near steel ring silk screen and produces the ammonia, makes tail gas homogeneous mixing ammonia, again through offering the semicircle groove in the end one side of giving vent to anger dorsad, offer the venthole pipe of venthole on end one side and the bottom plate of giving vent to anger towards and carry out the rectification to the mixed gas flow that comes down from the steel ring silk screen, the mixed gas flow leaves the spiral-flow mixer through the air current distributor at last, has guaranteed the speed homogeneity of mixed gas flow and the homogeneity of mixed ammonia before getting into the SCR system.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a front view structural diagram of the present invention;

FIG. 2 is a left side view of the structure of the present invention;

FIG. 3 is a left side sectional structural view of the present invention;

fig. 4 is an exploded schematic view of the present invention.

The specification reference numbers indicate: 1. the device comprises a shell, 2, a cyclone clapboard, 3, an air inlet end, 4, an air outlet end, 5, an air flow distributor, 6, a first air inlet cyclone pipe, 7, a urea nozzle, 8, a second air inlet cyclone pipe, 9, an air outlet pipe, 10, an air outlet hole, 11, a steel ring wire mesh, 12, a plane structure, 13, an air inlet groove, 14, a first flanging groove, 15, a slope surface, 16, an air inlet hole, 17, a second flanging groove, 18, a semicircular arc groove, 19, a bottom plate, 20, a bottom shell, 21 and a cover plate.

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

As shown in fig. 1-4, the utility model discloses a spiral-flow type mixer for automobile exhaust purifies, include:

the device comprises a shell 1, wherein a rotational flow clapboard 2 is horizontally connected and arranged in the shell 1, the rotational flow clapboard 2 divides the interior of the shell 1 into an upper chamber and a lower chamber, a flow guide hole is formed in the rotational flow clapboard 2, an air inlet end 3 communicated with the upper chamber is arranged at the upper end of the shell 1, an air outlet end 4 communicated with the lower chamber is arranged at the lower end of the shell 1, and an air flow distributor 5 is arranged on the air outlet end 4;

the first air inlet swirl tube 6 is of a cylindrical structure and is vertically arranged in the upper chamber, and a urea nozzle 7 is arranged in the top of the shell 1 facing the first air inlet swirl tube 6;

the second air inlet cyclone tube 8 is of a cylindrical structure and is connected and arranged between the first air inlet cyclone tube 6 and the cyclone partition plate 2, the upper end of the second air inlet cyclone tube 8 is communicated with the inside of the first air inlet cyclone tube 6, and the lower end of the second air inlet cyclone tube 8 is communicated with the flow guide hole;

the air outlet pipe 9 is vertically arranged in the lower cavity, and air outlet holes 10 are uniformly formed in the air outlet pipe 9;

and the steel ring screen 11 is horizontally arranged and connected between the air outlet pipe 9 and the rotational flow partition plate 2, and the air flow downwards passes through the steel ring screen 11 from the guide holes and then enters the air outlet pipe 9.

Before use, the cyclone mixer is assembled, the inside of the shell 1 is completely divided into an upper cavity and a lower cavity by fixedly mounting a cyclone partition plate 2, the upper cavity and the lower cavity are only communicated through a flow guide hole on the cyclone partition plate 2, then a urea nozzle 7, a first air inlet cyclone tube 6 and a second air inlet cyclone tube 8 are mounted, the bottom of the second air inlet cyclone tube 8 is hermetically connected with the cyclone partition plate 2, the inside of the second air inlet cyclone tube 8 is completely communicated with the flow guide hole, the first air inlet cyclone tube 6 is connected at the upper end of the second air inlet cyclone tube 8, the feed end of the urea nozzle 7 is connected with a conduit connected with a urea pump, the jet end of the urea nozzle is opposite to the inside of the first air inlet cyclone tube 6 and is used for uniformly spraying urea aqueous solution into the inside of the first air inlet cyclone tube 6, in addition, a steel ring screen 11 is connected to the lower surface of the cyclone partition plate 2, and then an air outlet tube 9 is connected to the lower end of the steel ring screen 11, the steel ring silk screen 11 can be formed by regularly overlapping a steel ring sleeve and a plurality of layers of steel wire meshes connected in the steel ring sleeve layer by layer, the whole device is arranged in an SCR tail gas treatment system after assembly, an air inlet end 3 on a shell 1 is communicated with the tail end of a DPF carrier, an air outlet end 4 is communicated with the front end of the SCR carrier, when tail gas enters an upper cavity from the air inlet end 3, urea solution is atomized from a urea nozzle 7 and then downwards sprayed, the urea solution and the tail gas are preliminarily mixed in a first air inlet cyclone pipe 6 and a second air inlet cyclone pipe 8, the urea solution enters the steel ring silk screen 11 through a flow guide hole after preliminary mixing, the steel ring silk screen 11 is uniformly filled with the urea solution, the urea solution is contacted with the steel ring silk screen 11 at high temperature to generate a pyrolytic reaction to generate ammonia, the ammonia is further fully mixed with the tail gas, the crystallization risk is reduced, the tail gas mixed with the ammonia enters an air outlet pipe 9 after passing through the steel ring silk screen 11, and disordered air flow is arranged through the air outlet pipe 9, then the air flows out of the air outlet 10 and enters a subsequent SCR system after being uniformly distributed by the air flow distributor 5, and the diameter of the air outlet 10 is phi 4-phi 8 mm.

Traditional U type blender backpressure is generally great, whirl pipe external diameter size direct decision blender backpressure size, the utility model discloses a spiral-flow mixer has set up the first whirl pipe 6 and the second whirl pipe 8 of admitting air that are cylindrical structure, and the external diameter is great, and compact structure avoids the air current to receive the obstacle or the hindrance of sharp turn bend, and the tail gas air current gets into first whirl pipe 6 and the second whirl pipe 8 of admitting air, and after twice whirl parcel, the ammonia that urea aqueous solution got into steel ring silk screen 11 and decomposes the production can carry out better mixing with tail gas, and the backpressure of production is little.

In another technical solution, as shown in fig. 1 and 3-4, the first cyclone tube 6 is a vertically arranged cylindrical structure and is arranged as a mutually parallel plane structure 12 on one side facing away from the air inlet end 3 and one side facing the air inlet end 3, wherein, a plane structure 12 back to the air inlet end 3 is provided with an air inlet groove 13, the plane structure 12 facing the air outlet end 4 and the rest side surfaces of the first air inlet rotational flow pipe 6 are provided with a first flanging groove 14 for guiding flow along the circumference, a slope surface 15 is connected between each plane structure 12 and the bottom of the corresponding side of the first air inlet rotational flow pipe 6, the slope surface 15 is provided with an air inlet hole 16, the upper end of the second air inlet rotational flow pipe 8 is circumferentially provided with a plurality of second flanging grooves 17, and the rotational flow directions of the second flanging grooves 17 and the first flanging grooves 14 are consistent.

The mixer has compact structure, in order to further reduce back pressure, ammonia gas and tail gas are mixed in a limited space structure of a shell 1, the outer diameter of a first air inlet rotational flow pipe 6 is designed to be close to the upper limit of space, the first air inlet rotational flow pipe 6 with a cylindrical structure is flattened at two sides facing an air inlet end 3 and back to the air inlet end 3 to form a vertical plane structure which is parallel to each other, an air inlet groove 13 is arranged at one side facing away from the air inlet end 3 for facilitating air inlet, a first flanging groove 14 which is convenient for flow guiding is designed at the other three sides for better rotational flow, a flanging of the first flanging groove 14 is outwards turned over from the first flanging groove 14, an included angle between the flanging groove and the first air inlet rotational flow pipe 6 is an acute angle, a transition slope is arranged between the plane structure 12 at the flattened part and the bottom of the first air inlet rotational flow pipe 6 to form a slope surface 15, and an air inlet 16 with the diameter of 4-8 is arranged on the slope surface 15, after tail gas gets into the upper chamber from inlet end 3, mainly get into first air inlet cyclone 6 inside through air inlet duct 13 and inlet port 16, the small part air current gets into first air inlet cyclone 6 from first turn-ups groove 14, then the air current mixes the urea aqueous solution in first air inlet cyclone 6, utilize first turn-ups groove 14 to carry out gaseous whirl homogeneous mixing, later get into second air inlet cyclone 8 whirl once more from first

air inlet cyclone

6, 12 second turn-ups grooves 17 are seted up on 8 upper portions of second air inlet cyclone, the whirl direction of second turn-ups groove 17 is unanimous with the whirl direction of first turn-ups groove 14, be convenient for continue the whirl, it produces to reduce the backpressure.

In another technical solution, as shown in fig. 1 and fig. 3 to 4, the air inlet slot 13, the first flanging slot 14 and the first flanging slot 14 are all vertically arranged rectangular structures. The cyclone space is kept stable by the rectangular structure, so that the cyclone is convenient, and the back pressure increase caused by the cyclone obstacle on the airflow is avoided.

In another technical solution, as shown in fig. 1 and fig. 3 to 4, the first flanging groove 14, the slope surface 15 and the second flanging groove 17 are all opposite to the air inlet end 3.

After tail gas gets into the upper chamber from inlet end 3, most air current mix behind the urea aqueous solution through first air inlet cyclone tube 6 get into second air inlet cyclone tube 8 whirl once more, the fractional air current directly gets into second air inlet cyclone tube 8 from second turn-ups groove 17 in addition, two parts air current gets into steel ring silk screen 11 behind the water conservancy diversion hole on whirl baffle 2, fully gasify the mixture with the urea aqueous solution, then follow venthole pipe 9 and air flow distributor 5 flow in SCR in proper order, speed homogeneity and parcel ammonia homogeneity before having guaranteed to get into SCR.

In another technical solution, as shown in fig. 3 to 4, a semi-arc groove 18 is disposed on a side of the air outlet pipe 9 opposite to the air outlet end 4, a bottom plate 19 is covered at the bottom of the air outlet pipe 9, and the air outlet holes 10 are respectively and uniformly disposed on a side of the air outlet pipe 9 facing the air outlet end 4 and the bottom plate 19.

Through setting up semi-circular arc groove 18 at venthole pipe 9, avoid gaseous concentrating in venthole pipe 9, pressure is too big, from the air current that steel ring silk screen 11 came, partly go out from semi-circular arc groove 18, partly go out towards the venthole 10 of giving vent to anger end 4 one side through venthole pipe 9, partly go out through venthole 10 on the bottom plate 19, later partial air current is the inside and outside whirl of venthole pipe 9, through setting up the mixed gas of venthole pipe 9 convection tapping ring silk screen 11 at the entering end 4 front arrangement turbulent air current of giving vent to anger, make mixed gas can give vent to anger end 4 by the more even entering of speed.

In another technical solution, as shown in fig. 1 to 4, the housing 1 includes a bottom shell 20, one side of the bottom shell 20 is open, a cover plate 21 is covered on the open, and the air inlet end 3 and the air outlet end 4 are respectively opened at the upper end and the lower end of the cover plate 21, so that the housing 1 is in a U-shaped structure horizontally arranged as a whole.

Through setting up drain pan 20, with first air inlet cyclone tube 6, second air inlet cyclone tube 8, venthole pipe 9, steel ring silk screen 11, whirl baffle 2 is installed in

drain pan

20, 1 lid of rethread casing closes sealed drain pan 20, the tail gas air current is only inside through the inlet end 3 entering casing on the apron 21, with urea solution misce bene and carry out the rectification after from the 4 outflow of the end of giving vent to anger on the apron 21, make 1 overall structure of casing can be compacter, the width is little, occupation space is few, satisfy the blender design demand of U type structure encapsulation system, can be better mix urea solution, reduce nitrogen oxide and discharge.

In another technical solution, as shown in fig. 1 and 4, the airflow distributor 5 is a plate structure with meshes distributed on the surface.

The airflow distributor 5 is arranged in a plate-shaped structure with the surface being fully distributed with meshes, and the airflow distributor is covered and installed on the air outlet end 4, so that the mixed airflow flowing out of the air outlet end 4 can be distributed into a subsequent SCR system more uniformly.

In summary, the spiral-flow type mixer for purifying the automobile exhaust is particularly suitable for being arranged in an exhaust purifying device with a U-shaped structure, the shell is provided with a novel spiral-flow type structure comprising a first air inlet spiral-flow pipe and a second air inlet spiral-flow pipe, so that tail gas and urea aqueous solution are uniformly mixed, the problem of crystallization of the urea solution in a mixer can be greatly reduced, the back pressure is low, the tail gas is uniformly mixed with the urea solution, after the water conservancy diversion hole through whirl baffle, pack near steel ring silk screen and take place the pyrolysis and produce the ammonia, make tail gas homogeneous mixing ammonia, again through offering the semicircle groove in the end one side of giving vent to anger dorsad, set up the venthole pipe of venthole on end one side and the bottom plate of giving vent to anger towards giving vent to anger and carry out the rectification to the mixed gas flow that comes down from the steel ring silk screen, the mixed gas flow leaves the spiral-flow mixer through air flow distributor at last, the speed homogeneity of the mixed gas flow and the homogeneity of mixed ammonia before having guaranteed to get into the SCR system.

While the embodiments of the invention have been disclosed above, it is not limited to the applications set forth in the description and illustrated embodiments, but is capable of being applied in all kinds of fields adapted to the invention, and further modifications may readily be made by those skilled in the art, and the invention is therefore not limited to the details given herein and to the drawings described herein, without departing from the general concept defined by the appended claims and their equivalents.

Claims

1. A swirl mixer for automobile exhaust purification, comprising:

2. The rotational flow type mixer for purifying automobile exhaust according to claim 1, wherein the first rotational flow inlet pipe is vertically arranged and has a cylindrical structure, and a side facing away from the air inlet end and a side facing the air inlet end are arranged to be parallel planar structures, wherein the planar structure facing away from the air inlet end is provided with an air inlet groove, the planar structure facing the air outlet end and the other sides of the first rotational flow inlet pipe are provided with first flanging grooves for guiding flow along a circumference, a slope is connected between each planar structure and the bottom of the corresponding side of the first rotational flow inlet pipe, the slope is provided with an air inlet hole, the upper end of the second rotational flow inlet pipe is provided with a plurality of second flanging grooves along a circumference, and the second flanging grooves are in accordance with the rotational flow direction of the first flanging grooves.

3. The cyclonic mixer for purifying automobile exhaust gas as claimed in claim 2, wherein the air inlet slot, the first flanging slot and the first flanging slot are all vertically arranged rectangular structures.

4. The cyclonic mixer for purifying automobile exhaust gases as claimed in claim 2, wherein the first turn-up groove, the ramp surface and the second turn-up groove are all opposite to the air inlet end.

5. The rotational flow type mixer for purifying automobile exhaust according to claim 1, wherein the air outlet pipe is provided with a semi-arc groove on a side facing away from the air outlet end, a bottom plate is covered at the bottom of the air outlet pipe, and the air outlet pipe is provided with the air outlet holes uniformly on a side facing the air outlet end and the bottom plate, respectively.

6. The rotational flow type mixer for purifying automobile exhaust according to claim 1, wherein the housing includes a bottom shell, an opening is formed at one side of the bottom shell, a cover plate is covered on the opening, and the air inlet end and the air outlet end are respectively formed at the upper end and the lower end of the cover plate, so that the housing is in a U-shaped structure horizontally arranged as a whole.

7. A swirl mixer for automobile exhaust gas purification according to claim 1, wherein the air flow distributor is a plate-like structure having a surface covered with mesh holes.