CN210714816U - Double-layer rotational flow blade type urea injection mixing unit - Google Patents
Double-layer rotational flow blade type urea injection mixing unit Download PDFInfo
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- CN210714816U CN210714816U CN201921301666.5U CN201921301666U CN210714816U CN 210714816 U CN210714816 U CN 210714816U CN 201921301666 U CN201921301666 U CN 201921301666U CN 210714816 U CN210714816 U CN 210714816U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The utility model discloses a double-deck whirl blade type urea sprays mixing unit, it includes urea nozzle assembly, apron, whirl inner bore pipe, whirl outer bore pipe, bottom and connection ring board, and on urea nozzle assembly was fixed in the apron, the apron welded in the one end of whirl inner bore pipe, and the both ends of whirl inner bore pipe are provided with a plurality of whirl blade and first venthole array respectively, and the whirl inner bore pipe mid portion formed interior mixing chamber, the one end welded fastening bottom of whirl outer bore pipe, the other end pass through connection ring board fixed connection in whirl inner bore pipe, first venthole array is arranged in the outer mixing chamber of bottom, connection ring board and whirl outer bore pipe formation, just the second venthole array has been seted up on the whirl outer bore pipe. The double-layer rotational flow blade type urea injection mixing unit is simple and compact in structure and ingenious in design; the urea mixing path is lengthened, and the urea mixing and evaporating effect is improved; the risk of urea crystallization is reduced.
Description
Technical Field
The utility model belongs to diesel engine tail gas treatment technology especially relates to a double-deck whirl blade type urea sprays mixing unit for diesel engine tail gas treatment.
Background
Referring to fig. 1, fig. 1 is a schematic structural diagram of a conventional urea injection mixing unit, where the conventional urea injection mixing unit includes a urea nozzle 10, a nozzle mounting seat 11, a cover plate 12 and a swirl hole pipe 13, the urea nozzle 10 is assembled on the nozzle mounting seat 11, the nozzle mounting seat 11 and the cover plate 12 are welded together and then seal an opening at one end of the swirl hole pipe 13 through the cover plate 12, the other end of the swirl hole pipe 13 is an open end, two ends of the swirl hole pipe 13 are respectively provided with a plurality of air inlet holes 14 and a plurality of air outlet holes 15, and a portion of the swirl hole pipe 13 near the air inlet holes 14 is provided with a plurality of swirl vanes 16. When the device works, waste gas enters the cyclone hole pipe 4 through the opening of the cyclone blade 15 of the cyclone hole pipe 13 and the air inlet 14, is mixed with urea sprayed by the urea nozzle 10 in a rotating mode, flows out through the opening end of the cyclone hole pipe 4 and the air outlet 16, and enters the SCR carrier.
The key technology of the SCR system lies in NH3The mixing uniformity with the waste gas reduces the risk of urea crystallization. Existing mixer NH3Short mixing path, too low homogeneity of mixing, greater risk of crystallization, resulting in NOXThe conversion efficiency is low.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a double-deck whirl vane type urea sprays mixing unit to it is short to solve prior art urea and sprays mixing unit and have the mixed route, and the homogeneity of mixing is too low and the great problem of crystallization risk.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a double-deck whirl blade type urea sprays mixing unit, its includes urea nozzle, nozzle mount pad, apron, whirl inner bore pipe, whirl outer bore pipe, bottom and connecting ring board, the urea nozzle assembles on the nozzle mount pad, the nozzle mount pad is fixed in on the apron, the apron welds the one end of whirl inner bore pipe and seals this end opening, the other end of whirl inner bore pipe is the open end, just the both ends of whirl inner bore pipe are provided with a plurality of whirl blade and first venthole array respectively, form the opening between whirl blade and the whirl inner bore pipe, the part that lies in between whirl blade and the first venthole array on the whirl inner bore pipe forms interior mixing chamber body, wherein, the one end welded fastening bottom of whirl outer bore pipe, the other end pass through connecting ring board fixed connection on whirl inner bore pipe, first venthole array is arranged in bottom, bottom, In an outer mixing cavity formed by the connecting ring plate and the rotational flow outer hole pipe, a second air outlet hole array is formed in the rotational flow outer hole pipe.
Particularly, the cross section of the bottom cover is of a circular arc structure, and a gap is reserved between the cross section of the bottom cover and the opening end of the rotational flow inner hole pipe.
Particularly, the bottom cover is welded and fixed in the swirl outer hole pipe, and a step part arranged corresponding to the first air outlet hole array position is formed at the welding position of the bottom cover and the swirl outer hole pipe.
Particularly, a plurality of auxiliary air inlets are arranged on the connecting ring plate.
In particular, the first air outlet hole array and the second air outlet hole array are distributed in a staggered mode.
Particularly, an air inlet hole array is arranged between the rotational flow blade and the cover plate on the rotational flow inner hole pipe.
Particularly, the first air outlet hole array and the second air outlet hole array are circular holes, and the overall width of the first air outlet hole array is not larger than that of the second air outlet hole array.
Particularly, the auxiliary air inlets are arc-shaped holes, and all the auxiliary air inlets are uniformly distributed on the same circumference of the connecting ring plate.
The beneficial effects of the utility model are that, compare with prior art double-deck whirl blade type urea sprays mixing unit has following advantage:
1) the structure is simple and compact, and the design is ingenious;
2) an outer mixing cavity formed by a rotational flow outer hole pipe, a bottom cover and a connecting ring plate is additionally arranged outside the rotational flow inner hole pipe, so that the urea mixing path is lengthened, and the urea mixing and evaporating effect is improved;
3) the auxiliary air inlet holes in the connecting ring plate are matched with the first air outlet hole array in the rotational flow inner hole pipe, so that the air flow and the urea are mixed for multiple times, and meanwhile, the air flow blows the urea gathering points easily, and the urea crystallization risk is reduced;
4) the arrangement of the auxiliary air inlet on the connecting ring plate can shunt partial waste gas and reduce the back pressure of the mixer.
Drawings
FIG. 1 is a schematic view of a conventional urea injection mixing unit;
FIG. 2 is a schematic perspective view of a dual-layer swirl vane type urea injection mixing unit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the internal structure of a double-layer swirl vane type urea injection mixing unit according to an embodiment of the present invention;
fig. 4 is a cross-sectional view of a urea injection mixing unit with a double-layer swirl vane according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 2 to 4, in the present embodiment, a double-layer swirl vane type urea injection mixing unit includes a urea nozzle 20, a nozzle mounting seat 21, a cover plate 22, a swirl inner hole tube 23, a swirl outer hole tube 24, a bottom cover 25 and a connecting ring plate 26, the urea nozzle 20 is assembled on the nozzle mounting seat 21, the nozzle mounting seat 21 is welded and fixed on an outer side surface of the cover plate 22, the other side surface of the cover plate 22 is welded to one end of the swirl inner hole tube 23 to close the opening of the end, the other end of the swirl inner hole tube 23 is an open end, two ends of the swirl inner hole tube 23 are respectively provided with 6 to 12 swirl vanes 27 and a first air outlet hole array 28, an opening is formed between each swirl vane 27 and the swirl inner hole tube 23, an air inlet hole array 29 is formed between each swirl vane 27 and the cover plate 22 on the swirl inner hole tube 23, the first air outlet hole array 28 is located at the open end of, it includes 2 ~ 6 rows of circular ports, and inlet port array 29 includes 1 ~ 2 rows of strip shaped hole, and the part that lies in between whirl blade 27 and first outlet port array 28 on the whirl hole tube 23 forms interior mixing chamber 30.
One end of the rotational flow outer hole pipe 24 is welded and fixed with a bottom cover 25, the other end is fixedly connected with the rotational flow inner hole pipe 23 through a connecting ring plate 26, the cross section of the bottom cover 25 is of a circular arc structure, the bottom cover is spaced from the open end of the rotational flow inner hole pipe 23, the bottom cover 25 is welded and fixed in the rotational flow outer hole pipe 24, a step part 31 arranged corresponding to the position of the first air outlet hole array 28 is formed at the welding position of the bottom cover 25 and the rotational flow outer hole pipe 24, four circular arc auxiliary air inlet holes 32 are uniformly arranged on the same circumference of the connecting ring plate 26, the first air outlet hole array 28 is arranged in an outer mixing cavity 33 formed by the bottom cover 25, the connecting ring plate 26 and the rotational flow outer hole pipe 24, a second air outlet hole array 34 is arranged on the rotational flow outer hole pipe 24, the second air outlet hole array 34 adopts 4-12 rows of circular holes, and the first air outlet hole array 28 and the second air outlet hole, the overall width of the second array of exit apertures 34 is greater than the overall width of the first array of exit apertures 28.
When in work, most of the waste gas generated by the diesel engine enters the inner mixing cavity 30 in the rotational flow inner hole pipe 23 through the opening of the rotational flow blade 27 on the right side of the rotational flow inner hole pipe 23, and the urea solution is sprayed to the center of the rotational flow by the urea nozzle 20 through the strong rotation generated by the rotational flow blades 27, the urea solution is rapidly mixed with the air flow, meanwhile, urea solution can be prevented from being sprayed onto the wall surface of the rotational flow inner hole pipe 23, the risk of urea crystallization is reduced, then most of mixed gas flows flow out from the opening end of the rotational flow inner hole pipe 23, impacting on the circular arc bottom cover 25, then entering an outer mixing cavity 33 between the rotational flow outer hole pipe 24 and the rotational flow inner hole pipe 23, another small part of the mixed gas also flows into the outer mixing cavity 33 through the first air outlet hole array 28 of the rotational flow inner hole pipe 23, and strikes the bottom cover 25 and the step 31 of the swirl outer bore tube 24, thereby preventing urea from accumulating and crystallizing. Meanwhile, a small part of exhaust gas generated by the diesel engine enters an outer mixing cavity 33 between the rotational flow outer hole pipe 24 and the rotational flow inner hole pipe 23 through an auxiliary air inlet 32 on the connecting ring plate 26, is mixed with the two mixed gases again, and then flows out through a second air outlet array 34 on the rotational flow outer hole pipe 24 to enter the SCR carrier.
The double-layer rotational flow blade type urea injection mixing unit promotes the air flow to be mixed with the urea for multiple times by arranging the number and the size of the auxiliary air inlet holes 32 on the connecting ring plate 26 and the number and the size of the first air outlet hole arrays 28 of the rotational flow inner hole pipes 23. And partial waste gas can be shunted by arranging the number and the size of the auxiliary air inlet holes 32 on the connecting ring plate 26, so that the back pressure of the mixer is reduced.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (8)
1. The utility model provides a double-deck whirl blade type urea sprays mixing unit, its includes urea nozzle, nozzle mount pad, apron, whirl inner bore pipe, whirl outer bore pipe, bottom and connecting ring board, the urea nozzle assembles on the nozzle mount pad, the nozzle mount pad is fixed in on the apron, the apron welds the one end of whirl inner bore pipe and seals this end opening, the other end of whirl inner bore pipe is the open end, just the both ends of whirl inner bore pipe are provided with a plurality of whirl blade and first venthole array respectively, form the opening between whirl blade and the whirl inner bore pipe, the part that lies in on the whirl inner bore pipe between whirl blade and the first venthole array forms interior mixing chamber body, its characterized in that, the one end welded fastening bottom of whirl outer bore pipe, the other end passes through connecting ring board fixed connection on whirl inner bore pipe, first venthole array is arranged in bottom, first venthole array, In an outer mixing cavity formed by the connecting ring plate and the rotational flow outer hole pipe, a second air outlet hole array is formed in the rotational flow outer hole pipe.
2. The double-deck swirl vane type urea injection mixing unit of claim 1, wherein the cross-section of the bottom cover is a circular arc structure spaced from the open end of the swirl bore tube.
3. The unit as claimed in claim 1, wherein the bottom cover is welded and fixed in the outer hole tube, and a step is formed at the welding position of the bottom cover and the outer hole tube corresponding to the first air outlet array.
4. The unit as claimed in claim 1, wherein the connecting ring plate has a plurality of auxiliary inlet holes.
5. The unit of claim 1, wherein the first and second arrays of outlet holes are staggered.
6. The unit as claimed in claim 1, wherein an air inlet hole array is formed on the inner hole tube between the swirl vanes and the cover plate.
7. The unit of claim 1, wherein the first and second arrays of air outlets are circular holes, and the overall width of the first array of air outlets is not greater than the overall width of the second array of air outlets.
8. The unit as claimed in claim 4, wherein the auxiliary inlet holes are circular holes and all the auxiliary inlet holes are uniformly distributed on the same circumference of the connecting ring plate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019201488580 | 2019-01-28 | ||
| CN201920148858 | 2019-01-28 |
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| Publication Number | Publication Date |
|---|---|
| CN210714816U true CN210714816U (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921301666.5U Active CN210714816U (en) | 2019-01-28 | 2019-08-12 | Double-layer rotational flow blade type urea injection mixing unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109488426A (en) * | 2019-01-28 | 2019-03-19 | 凯龙高科技股份有限公司 | A kind of Double layer spiral flow vane type urea injection mixed cell |
-
2019
- 2019-08-12 CN CN201921301666.5U patent/CN210714816U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109488426A (en) * | 2019-01-28 | 2019-03-19 | 凯龙高科技股份有限公司 | A kind of Double layer spiral flow vane type urea injection mixed cell |
| CN109488426B (en) * | 2019-01-28 | 2023-10-03 | 凯龙高科技股份有限公司 | Double-layer rotational flow vane type urea injection mixing unit |
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Address after: 214153 Jiangsu city in Wuxi Province Economic Development Zone Huishan Qianqiao Temple Tangqiao supporting area Patentee after: KAILONG HIGH TECHNOLOGY Co.,Ltd. Address before: 214153 Miaotang bridge, Qianqiao supporting area, Huishan Economic Development Zone, Suzhou City, Jiangsu Province Patentee before: KAILONG HIGH TECHNOLOGY Co.,Ltd. |
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