Urea mixing structure for post-treatment of national 6 hybrid diesel oil

Abstract

The utility model relates to the technical field of post-treatment urea mixing structures, in particular to a national six-hybrid diesel post-treatment urea mixing structure which comprises a DOC (Diesel Oxidation Catalyst), a DPF (Diesel Particulate Filter), a urea mixing box and an SCR (Selective Catalytic Reduction) catalytic box assembly, the right end of the DOC and the right end of the DPF particle trap, the left end of the DPF particle trap and the left end of the urea mixing box, the right end of the urea mixing box and the right end of the SCR catalytic box assembly communicate with conversion units, a turbulent flow assembly is arranged in the urea mixing box, a mounting hole is formed in the upper surface of the urea mixing box, and the inner wall of the mounting hole is in threaded connection with a urea nozzle. When the DPF particle capturing or urea mixing box needs to be overhauled and replaced, the first communicating pipe can be detached by screwing off the connecting bolt and the connecting nut, so that extrusion of adjacent components does not need to be worried, and the DPF particle capturing or urea mixing box is not easy to take down.

Description

TECHNICAL FIELD

[0001] The utility model relates to postprocessing urea mixing structure technical field especially relates to a national six hybrid diesel postprocessing urea mixing structure. BACKGROUND

[0002] National six hybrid diesel postprocessing system mainly includes DOC (diesel oxidation catalyst) and DPF (particulate matter trap). The main task of DOC is to oxidize nitrogen oxide NO to NO2, and oxidize HC compound, provide strong oxidant and high temperature environment for DPF regeneration. DPF captures particulate matter in tail gas through its internal wall flow structure, prevents it from being discharged into the air to cause pollution.

[0003] For example, the authorized announcement number "CN213775501U" is named national six postprocessor, the utility model discloses a national six postprocessor, because the inside of the pipe body of the gas guide pipe is increased with the side net, so that the bottom net in the pipe body does not contact with the pipe wall, and all steel wire meshes are basically suspended, effectively overcome the problem of urea crystallization at the contact place of steel wire mesh and pipe wall in low temperature working condition, and the U-shaped steel wire mesh structure is additionally arranged at the pipe opening end of the gas guide pipe, the breaking efficiency of spray droplets is improved, the vaporization effect and uniformity of the urea mixing cavity of the postprocessing device are effectively improved, and urea crystallization in the mixing cavity is effectively prevented.

[0004] The above and prior art have the following defects: the OC oxidation catalyst, DPF particulate trap, urea mixing box and SCR catalytic box assembly of the postprocessor are connected in sequence through flanges, when the DPF particulate trap or urea mixing box needs to be overhauled and replaced separately, due to the extrusion of adjacent components, the DPF particulate trap or urea mixing box is not easy to be taken down, and at the same time, the DPF particulate trap or urea mixing box is not easy to be installed. The OC oxidation catalyst, DPF particulate trap, urea mixing box and SCR catalytic box assembly in the postprocessor are installed along the length on one side, and occupy a large space. UTILITY MODEL CONTENTS

[0005] The utility model discloses a national six hybrid diesel postprocessing urea mixing structure which solves the defects in the prior art.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] The application discloses a kind of national six hybrid diesel aftertreatment urea mixing structure, including DOC oxidation catalyst, DPF particle capture, urea mixing box and SCR catalytic box assembly, the DOC oxidation catalyst left end is communicated with intake pipe, the SCR catalytic box assembly left end is communicated with outlet pipe, the DOC oxidation catalyst right end and DPF particle capture right end, DPF particle capture left end and urea mixing box left end, urea mixing box right end and SCR catalytic box assembly right end are communicated with conversion unit, the conversion unit includes two first communication pipe and the second communication pipe communicated with it, the DOC oxidation catalyst, DPF particle capture, urea mixing box and SCR catalytic box assembly are close to the first flange of first communication pipe one end and are equipped with first flange, multiple the first communication pipe is close to the first flange of first communication pipe one end and is equipped with second flange, the first flange and second flange surface are equipped with multiple flange holes, the flange hole side is equipped with connecting bolt, the connecting bolt one end penetrates two connected flange holes and is threadedly connected with connecting nut, the urea mixing box is equipped with turbulence component inside, the urea mixing box upper surface is equipped with mounting hole, and the mounting hole inner wall is threadedly connected with urea nozzle.

[0008] Preferably, the turbulence component includes an air inlet cylinder, a second air baffle disposed on the left side, and a second air inlet side plate disposed on the right side, the air inlet cylinder upper and lower surfaces and left side surface, and the second air inlet side plate are each provided with a plurality of air holes, and the air inlet cylinder, the second air baffle, and the second air inlet side plate are each connected with the urea mixing box inner wall.

[0009] Preferably, the first communication pipe one side surface close to the first flange is provided with a positioning groove, and the DOC oxidation catalyst, the DPF particle capture, the urea mixing box, and the SCR catalytic box assembly one end close to the second flange is provided with a positioning block, and the positioning block extends into the positioning groove.

[0010] Preferably, the DOC oxidation catalyst, the DPF particle capture, the urea mixing box, and the SCR catalytic box assembly are respectively provided with a first sealing gasket between the corresponding first communication pipe.

[0011] Preferably, the mounting hole upper end extends an upper edge, and the urea nozzle is threadedly connected with the mounting hole upper edge inner wall.

[0012] Preferably, the urea nozzle and the upper edge are provided with a second sealing gasket.

[0013] The utility model provides a kind of national six mixed diesel aftertreatment urea mixing structure, beneficial effect lies in: when needing to overhaul and replace DPF particle capture or urea mixing box, only first communication pipe on the both ends of DPF particle capture or urea mixing box needs to be removed by screwing down connecting bolt and connecting nut, first communication pipe can be disassembled, so adjacent components are not extruded, DPF particle capture or urea mixing box is not easily removed, simultaneously, DPF particle capture or urea mixing box is also very easy to install. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the overall structure schematic diagram of the utility model;

[0015] Figure 2 It is urea mixing box and first communication pipe cross-section structure schematic diagram of the utility model;

[0016] Figure 3 It is the turbulence subassembly structure schematic diagram of the utility model;

[0017] Figure 4 It is the A position enlarged view of the utility model;

[0018] Figure 5 It is the B position enlarged view of the utility model.

[0019] In the drawing: DOC oxidation catalyst 1, DPF particle capture 2, urea mixing box 3, SCR catalytic tank assembly 4, air inlet pipe 5, air outlet pipe 6, first communication pipe 7, second communication pipe 8, first flange 9, second flange 10, flange hole 11, connecting bolt 12, connecting nut 13, mounting hole 14, urea nozzle 15, turbulence subassembly 16, air inlet cylinder 17, air hole 18, second air baffle 19, second air inlet side plate 20, positioning groove 21, positioning block 22, first sealing pad 23, upper edge 24, second sealing pad 25. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0021] REFERENCE Figures 1-5The application discloses a national sixth hybrid diesel aftertreatment urea mixing structure which comprises a DOC oxidation catalyst 1, a DPF particle trap 2, a urea mixing box 3 and an SCR catalytic box assembly 4. The left end of the DOC oxidation catalyst 1 is connected with an air inlet pipe 5, and the left end of the SCR catalytic box assembly 4 is connected with an air outlet pipe 6. The right end of the DOC oxidation catalyst 1 and the right end of the DPF particle trap 2, the left end of the DPF particle trap 2 and the left end of the urea mixing box 3, the right end of the urea mixing box 3 and the right end of the SCR catalytic box assembly 4 are all connected with a switching unit. The switching unit comprises two first connecting pipes 7 and a second connecting pipe 8 connected with the first connecting pipes 7. The DOC oxidation catalyst 1, the DPF particle trap 2, the urea mixing box 3 and the SCR catalytic box assembly 4 are all provided with a first flange 9 close to one end of the first connecting pipe 7. The first flange 9 is provided with a second flange 10 close to one end of the first connecting pipe 7. The first flange 9 and the second flange 10 are both provided with a plurality of flange holes 11. A connecting bolt 12 is arranged on one side of the flange hole 11. One end of the connecting bolt 12 penetrates through two connected flange holes 11 and is threadedly connected with a connecting nut 13. The urea mixing box 3 is internally provided with a turbulence component 16. The upper surface of the urea mixing box 3 is provided with a mounting hole 14. The mounting hole 14 is threadedly connected with a urea nozzle 15.

[0022] The turbulence component 16 comprises an air inlet cylinder 17, a second air separation plate 19 arranged on the left side and a second air inlet side plate 20 arranged on the right side. The air inlet cylinder 17, the second air separation plate 19 and the second air inlet side plate 20 are all connected with the inner wall of the urea mixing box 3.

[0023] The side surface of the first connecting pipe 7 close to the first flange 9 is provided with a positioning groove 21. The DOC oxidation catalyst 1, the DPF particle trap 2, the urea mixing box 3 and the SCR catalytic box assembly 4 are all provided with a positioning block 22 close to one end of the second flange 10. The positioning block 22 extends into the positioning groove 21. The positioning block 22 and the positioning groove 21 are connected, so that the DOC oxidation catalyst 1, the DPF particle trap 2, the urea mixing box 3 and the SCR catalytic box assembly 4 can be quickly installed.

[0024] The first connecting pipe 7 is provided with a first sealing gasket 23 between the DOC oxidation catalyst 1, the DPF particle trap 2, the urea mixing box 3 and the SCR catalytic box assembly 4 and the corresponding first connecting pipe 7. The first sealing gasket 23 is arranged to play a sealing role.

[0025] The upper end of the mounting hole 14 extends an upper edge 24. The urea nozzle 15 is threadedly connected with the inner wall of the upper edge 24. The upper edge 24 is arranged to play a role of reinforcing the mounting hole 14 and facilitating the installation of the urea nozzle 15.

[0026] The urea nozzle 15 is provided with a second sealing gasket 25 between the urea nozzle 15 and the upper edge 24. The second sealing gasket 25 is arranged to play a sealing role.

[0027] Working principle: exhaust gas passes through the intake pipe 5, DOC oxidation catalyst 1 and DPF particle trap 2 in turn, and then enters the urea mixing box 3, enters the intake cylinder 17, and the urea solution sprayed by the urea nozzle 15 is broken and scattered through the upper wall of the intake cylinder 17, and then mixed with the exhaust gas; After mixing, it enters between the second air baffle 19 and the second intake side plate 20 through the lower wall of the intake cylinder 17, and is discharged through the second intake side plate 20, and the mixed exhaust gas enters the SCR catalytic box assembly 4 through the conversion unit, and is finally discharged through the exhaust pipe 6.

[0028] When it is necessary to overhaul and replace the DPF particle trap 2 or the urea mixing box 3, only the first communication pipe 7 at both ends of the DPF particle trap 2 or the urea mixing box 3 needs to be disassembled by unscrewing the connecting bolt 12 and the connecting nut 13, so that the first communication pipe 7 can be disassembled, so that there is no need to worry about the extrusion of adjacent components, and the DPF particle trap 2 or the urea mixing box 3 is not easy to remove, and at the same time, the DPF particle trap 2 or the urea mixing box 3 is very easy to install.

[0029] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A sixth-generation hybrid diesel aftertreatment urea mixing structure, comprising a DOC oxidation catalyst (1), a DPF particle trap (2), a urea mixing tank (3), and an SCR catalytic tank assembly (4), characterized in that, The left end of the DOC oxidation catalyst (1) is communicated with an air inlet pipe (5), the left end of the SCR catalytic tank assembly (4) is communicated with an air outlet pipe (6), the right end of the DOC oxidation catalyst (1) and the right end of the DPF particle trap (2), the left end of the DPF particle trap (2) and the left end of the urea mixing tank (3), the right end of the urea mixing tank (3) and the right end of the SCR catalytic tank assembly (4) are all communicated with a conversion unit, the conversion unit includes two first communication pipes (7) and a second communication pipe (8) communicated with the first communication pipes (7), the DOC oxidation catalyst (1), the DPF particle trap (2), the urea mixing tank (3) and the SCR catalytic tank assembly (4) are all provided with a first flange (9) at one end close to the first communication pipe (7), a plurality of the first communication pipes (7) are all provided with a second flange (10) at one end close to the first flange (9), a plurality of flange holes (11) are arranged on the surfaces of the first flange (9) and the second flange (10), a connecting bolt (12) is arranged on the side of the flange hole (11), one end of the connecting bolt (12) penetrates through two connected flange holes (11) and is threadedly connected with a connecting nut (13), a turbulence assembly (16) is arranged in the urea mixing tank (3), and a mounting hole (14) is arranged on the upper surface of the urea mixing tank (3).

2. The sixth-generation hybrid diesel aftertreatment urea mixing structure according to claim 1, characterized in that, The turbulence assembly (16) includes an air inlet cylinder (17), a second air baffle (19) arranged on the left side and a second air inlet side plate (20) arranged on the right side, a plurality of air holes (18) are arranged on the upper and lower surfaces and the left surface of the air inlet cylinder (17) and the second air inlet side plate (20), and the air inlet cylinder (17), the second air baffle (19) and the second air inlet side plate (20) are connected with the inner wall of the urea mixing tank (3).

3. The sixth-generation hybrid diesel aftertreatment urea mixing structure according to claim 1, characterized in that, A positioning groove (21) is arranged on one side surface of each of the plurality of first communication pipes (7) close to the first flange (9), and a positioning block (22) is arranged at one end of the DOC oxidation catalyst (1), the DPF particle trap (2), the urea mixing tank (3) and the SCR catalytic tank assembly (4) close to the second flange (10).

4. The sixth-generation hybrid diesel aftertreatment urea mixing structure according to claim 1, characterized in that, First sealing gaskets (23) are arranged between the DOC oxidation catalyst (1), the DPF particle trap (2), the urea mixing tank (3) and the SCR catalytic tank assembly (4) and the corresponding first communication pipes (7).

5. The sixth-generation hybrid diesel aftertreatment urea mixing structure according to claim 1, characterized in that, An upper edge (24) extends from the upper end of the mounting hole (14), and the urea nozzle (15) is threadedly connected with the inner wall of the upper edge (24).

6. The sixth national hybrid diesel aftertreatment urea mixing structure according to claim 1, characterized in that, A second sealing gasket (25) is arranged between the urea nozzle (15) and the upper edge (24).

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