CN216077278U

CN216077278U - Straight cylinder type urea mixing device

Info

Publication number: CN216077278U
Application number: CN202122656778.6U
Authority: CN
Inventors: 何龙; 冯玉杰; 徐谦; 王亦群; 史运帅
Original assignee: Wuxi Yili Environmental Protection Technology Co Ltd; Hebei Yili Technology Co Ltd
Current assignee: Wuxi Yili Environmental Protection Technology Co Ltd; Hebei Yili Technology Co Ltd
Priority date: 2021-11-02
Filing date: 2021-11-02
Publication date: 2022-03-18
Anticipated expiration: 2031-11-02

Abstract

The utility model discloses a straight cylinder type urea mixing device, wherein a partition plate and a rear baffle plate are arranged in a shell, a crushing plate is arranged between a front vertical plate part and the rear baffle plate, a mixing pipe is inserted on an upper horizontal plate part, a crushing cylinder is inserted at the bottom of the mixing pipe, a plurality of blade groups which are arranged up and down are arranged in a cylinder body of the crushing cylinder, and each blade group is provided with a plurality of crushing blades. The blade groups of the crushing cylinder can fully crush urea liquid drops into small particles, so that the urea liquid drops can fully absorb heat, volatilize and decompose, urea crystal formation is inhibited, and the risk of urea crystallization is reduced.

Description

Straight cylinder type urea mixing device

Technical Field

The utility model relates to the technical field of engine tail gas aftertreatment, in particular to a straight cylinder type urea mixing device.

Background

At present, in an engine exhaust gas after-treatment system, Selective Catalytic Reduction (SCR) is generally adopted for after-treatment, urea aqueous solution is sprayed into an exhaust gas after-treatment mixer, and Nitrogen Oxides (NO) in the exhaust gas are treated under the action of a catalyst_X) Reduction to harmless nitrogen (N)₂) And water (H)₂O) to achieve the aim of reducing emissions.

The urea of the existing urea mixing device is easy to drop on the wall surface of an internal element to form urea crystals, which affects the performance of an after-treatment system, and even causes the emission to exceed the standard or the after-treatment system to be blocked to cause the insufficient power of a vehicle.

SUMMERY OF THE UTILITY MODEL

The applicant aims at the defects of the existing urea mixing device and provides a straight-cylinder urea mixing device with a reasonable structure, urea liquid drops are fully crushed, and the risk of urea crystallization is reduced.

The technical scheme adopted by the utility model is as follows:

a straight cylinder type urea mixing device is characterized in that a partition plate and a rear baffle plate are arranged in a shell, the partition plate is provided with a front vertical plate part and an upper transverse plate part, the front vertical plate part is connected with the front side edge of the upper transverse plate part, and the rear side edge of the upper transverse plate part is connected with the rear baffle plate; a crushing plate is arranged between the front vertical plate part and the rear baffle plate and below the crushing cylinder, and the cavity on the front side of the rear baffle plate is divided into an air inlet cavity, a mixing cavity and an air outlet cavity by the partition plate and the crushing plate; a mixing pipe is inserted in the upper transverse plate part in a penetrating way, the upper part of the mixing pipe is positioned in the air inlet cavity, the lower part of the mixing pipe extends into the mixing cavity, and the mixing pipe is communicated with the air inlet cavity and the mixing cavity; the bottom of the mixing pipe is inserted with a crushing barrel, a plurality of layers of blade groups which are arranged up and down are arranged in a barrel body of the crushing barrel, and each layer of blade group is provided with a plurality of crushing blades; the crushing plate is provided with a plurality of second crushing holes, and the second crushing holes are communicated with the mixing cavity and the air outlet cavity; the rear baffle is provided with a gap to form an air outlet channel, and the gap is communicated with the air outlet cavity.

As a further improvement of the above technical solution:

the crushing blade is provided with a plurality of first crushing holes.

The crushing blades incline downwards in an inclined mode, a torsion angle of 10-15 degrees is formed between each crushing blade and the horizontal line, and the inclination directions of all the crushing blades are consistent.

Crushing blades of blade groups on adjacent layers of the crushing barrels are arranged in a staggered mode; the crushing blades of the crushing barrel are integrally formed on the barrel body.

A plurality of air inlet holes are formed in the cylindrical wall surface of the pipe portion of the air inlet cavity on the mixing pipe, an air inlet blade is arranged on each air inlet hole, the air inlet blades face the inward opening of the mixing pipe, the air inlet blades incline downwards, and the included angle between each air inlet blade and the vertical line ranges from 30 degrees to 60 degrees.

The crushing plate is a U-shaped plate and is provided with a horizontal bottom plate and side plates at two sides, and a plurality of second crushing holes are formed in the plate surface of the bottom plate and the lower plate surfaces of the two side plates.

The outer contour dimension of the rear baffle is matched with the inner contour dimension of the corresponding part of the shell, and two opposite sides of the rear baffle are respectively provided with a notch.

The baffle, the rear baffle and the crushing plate are provided with a positioning structure.

A rear upper inserting sheet is arranged on the rear side edge of the upper transverse plate part of the partition plate, a rear upper slot is formed in the rear baffle plate, and the rear upper inserting sheet of the upper transverse plate part penetrates into the rear upper slot of the rear baffle plate to form a positioning structure between the partition plate and the rear baffle plate; a front slot is formed in the front vertical plate part of the partition plate, an upper slot is formed in the upper transverse plate part, a front inserting piece is arranged on the front side edge of the bottom plate of the crushing plate, upper inserting pieces are arranged on the upper edges of the two side plates, the front inserting piece is inserted into the front slot of the front vertical plate part, and the upper inserting piece is inserted into the upper slot of the upper transverse plate part, so that a positioning structure between the partition plate and the crushing plate is formed; the back is seted up slot down in the back on the backplate, is equipped with back lower inserted sheet behind the bottom plate of breaker from the side, and the inserted sheet alternates in the slot under the back of backplate under the back, constitutes the location structure between breaker and the backplate.

The shell is provided with a nozzle seat corresponding to the mixing pipe.

The utility model has the following beneficial effects:

the blade groups of the crushing cylinder can fully crush urea liquid drops into small particles, so that the urea liquid drops can fully absorb heat, volatilize and decompose, urea crystal formation is inhibited, and the risk of urea crystallization is reduced. A plurality of first broken holes are formed in the broken blade, urea liquid drops falling onto the broken blade can penetrate through the first broken holes, urea liquid drops are prevented from being deposited on the broken blade, and the risk of urea crystallization on the broken blade is reduced. The oblique downward-inclined crushing blades also have a flow guiding effect on urea liquid drops falling on the blades, and the urea liquid drops can slide down along the crushing blades and cannot be attached to the crushing blades, so that urea liquid drops are prevented from being deposited on the crushing blades to form urea crystals, and the risk of urea crystallization is reduced. The urea liquid drops can be further crushed by the second crushing holes of the crushing plate, so that the urea liquid drops are further crushed and pyrolyzed fully, and the risk of urea crystallization is reduced.

The air inlet blade of the mixing pipe can guide the air flow to be blown into the mixing pipe in an inclined downward direction in an accelerated manner, the air inlet blade can provide a shielding effect for urea liquid drops, the air flow is prevented from blowing the urea liquid drops directly to blow the urea liquid drops to the inner wall surface of the mixing pipe, the risk of urea crystal formation on the mixing pipe is reduced, the air inlet blade inclined downwards in an inclined manner also has a flow guiding effect on the urea liquid drops falling on the air inlet blade, the urea liquid drops can slide downwards along the air inlet blade and cannot be attached to the air inlet blade, the urea liquid drops are prevented from being deposited on the air inlet blade to form the urea crystal, and the risk of urea crystal formation is reduced.

The air flow of the air outlet cavity of the utility model flows out from the notches at the two sides of the rear baffle plate to form a strong rotating effect, so that the air flow can have a longer mixing path under a limited length, the mixing effect of the mixed air flow is better, and the mixing uniformity is higher.

The baffle plate, the rear baffle plate and the crushing plate are respectively provided with the positioning structures, positioning is carried out through the positioning structures, auxiliary positioning through a positioning fixture is not needed, the input cost of a positioning tool is saved, and the manufacturing cost of the mixing device is further saved.

Drawings

Fig. 1 is a perspective view of the present invention.

Fig. 2 is a perspective view from another perspective of the present invention.

Fig. 3 is an exploded view of the present invention.

Fig. 4 is a cross-sectional view of the present invention.

Fig. 5 is a perspective view of the crushing drum.

In the figure: 1. a housing; 2. a partition plate; 21. a front vertical plate portion; 211. a front slot; 22. an upper cross plate portion; 221. inserting holes; 222. an upper slot; 223. inserting sheets are arranged on the back of the frame; 3. a tailgate; 31. a notch; 32. a rear upper slot; 33. a rear lower slot; 4. a mixing tube; 41. an air inlet; 42. an air intake blade; 5. a crushing cylinder; 51. crushing the leaves; 52. a first crushing hole; 6. a breaker plate; 61. a base plate; 62. a side plate; 63. a second crushing hole; 64. a front insert; 65. inserting the sheet at the back; 66. inserting the sheet; 7. a nozzle holder;

10. an air inlet cavity; 20. a mixing chamber; 30. and an air outlet cavity.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1 to 4, a cylindrical casing 1 of the present invention is provided with a partition plate 2 and a back plate 3, and the partition plate 2 is located on the front side of the back plate 3. The partition board 2 is an inverted L-shaped board and is provided with a front vertical board part 21 and an upper horizontal board part 22, the front vertical board part 21 is connected with the front side edge of the upper horizontal board part 22, the rear side edge of the upper horizontal board part 22 is welded and fixed on the rear baffle 3, and the front vertical board part 21 and the rear baffle 3 are parallel and arranged in the shell 1 along the radial direction; between preceding vertical plate portion 21 and backplate 3, be located broken section of thick bamboo 5 below and be provided with crushing plate 6, baffle 2 separates the cavity in backplate 3 front side into air inlet chamber 10, mixing chamber 20 and play gas chamber 30 with crushing plate 6, air inlet chamber 10 is backplate 3 front side, the cavity of preceding vertical plate portion 21 front side and last horizontal plate portion 22 upside, mixing chamber 20 is backplate 3 front side, the cavity between preceding vertical plate portion 21 rear side and last horizontal plate portion 22 and crushing plate 6, it is the cavity between backplate 3 front side, preceding vertical plate portion 21 rear side and the crushing plate 6 downside to go out the gas chamber 30.

As shown in fig. 3, the front vertical plate portion 21 of the partition board 2 is provided with a front slot 211; a through hole 221 is formed in the center of the upper transverse plate portion 22, and upper slots 222 are respectively formed in the upper transverse plate portion 22 and on two sides of the through hole 221; a rear upper inserting piece 223 is protruded outwardly from the rear side edge of the upper cross plate portion 22. As shown in fig. 3 and 4, the mixing tube 4 is inserted through the insertion hole 221 of the upper horizontal plate 22, the upper portion of the mixing tube 4 is located in the air intake chamber 10, the upper end portion of the mixing tube 4 is fixed on the housing 1, the lower portion of the mixing tube 4 extends into the mixing chamber 20, and the mixing tube 4 communicates with the air intake chamber 10 and the mixing chamber 20. The casing 1 is provided with a nozzle holder 7 corresponding to the mixing tube 4, the nozzle holder 7 being connectable to a urea nozzle (not shown) for spraying urea droplets into the mixing tube 4.

As shown in fig. 3 and 4, a plurality of square air inlets 41 are formed on the cylindrical wall surface of the tube part of the mixing tube 4 located in the air inlet chamber 10, and the air inlets 41 communicate the air inlet chamber 10 with the inner cavity of the mixing tube 4; each air inlet 41 is provided with an air inlet blade 42, the air inlet blades 42 are opened inwards towards the interior of the mixing pipe 4, the air inlet blades 42 incline downwards in an inclined mode, the included angle between each air inlet blade 42 and the vertical line is 30-60 degrees, the air inlet blades 42 can guide air flow to blow into the mixing pipe 4 in an accelerating mode towards the downward direction, the air inlet blades 42 can provide a shielding effect for urea liquid drops, the air flow is prevented from blowing the urea liquid drops directly to blow the urea liquid drops to the inner wall surface of the mixing pipe 4, the risk of urea crystal formation on the mixing pipe 4 is reduced, the air inlet blades 42 inclining downwards have a flow guiding effect on the urea liquid drops falling on the air inlet blades, the urea liquid drops can slide downwards along the air inlet blades 42 and cannot be attached to the air inlet blades 42, the urea liquid drops are prevented from depositing on the air inlet blades 42 to form the urea crystal, and the risk of the urea crystal is reduced.

As shown in fig. 3 and 4, a crushing cylinder 5 is inserted into the bottom of the pipe portion of the mixing pipe 4 extending into the mixing chamber 20, and the crushing cylinder 5 is welded and fixed to the mixing pipe 4. As shown in fig. 3 to 5, a plurality of blade sets arranged up and down are arranged in the barrel body of the crushing barrel 5, each blade set has a plurality of crushing blades 51, the crushing blades 51 of the blade sets of the adjacent layers are arranged in a staggered manner, in this embodiment, two staggered blade sets are arranged in the crushing barrel 5; the urea liquid drops can be fully crushed into small particles by the blade groups of the crushing cylinder 5, so that the urea liquid drops can fully absorb heat, volatilize and decompose, the formation of urea crystals is inhibited, and the risk of urea crystals is reduced. A plurality of first crushing holes 52 are formed in the crushing blade 51, urea liquid drops falling onto the crushing blade 51 can pass through the first crushing holes 52, urea liquid drops are prevented from being deposited on the crushing blade 51, and the risk of urea crystallization on the crushing blade 51 is reduced. The crushing blades 51 are inclined downwards from one side to the other side in an inclined mode, a torsion angle of 10-15 degrees is formed between the crushing blades 51 and the horizontal line, the inclination directions of all the crushing blades 51 are consistent, the crushing blades 51 inclined downwards in an inclined mode also have a flow guiding effect on urea liquid drops falling on the crushing blades 51, the urea liquid drops can slide downwards along the crushing blades 51 and cannot be attached to the crushing blades 51, urea liquid drops are prevented from being deposited on the crushing blades 51 to form urea crystals, and the risk of urea crystallization is reduced. The crushing blades 51 of the crushing barrel 5 are integrally formed on the barrel body, so that the use of welding seams and positioning fixtures can be reduced, the reliability is improved, and the manufacturing cost is also reduced.

As shown in fig. 3 and 4, the crushing plate 6 is a U-shaped plate, and has a horizontal bottom plate 61 and two side plates 62, wherein a plurality of second crushing holes 63 are formed on the plate surface of the bottom plate 61 and the lower plate surfaces of the two side plates 62, and the second crushing holes 63 communicate the mixing cavity 20 and the air outlet cavity 30; the urea liquid drops can be further crushed by the second crushing holes 63, so that the urea liquid drops are further crushed and pyrolyzed sufficiently, and the risk of urea crystallization is reduced. The front side edge of the bottom plate 61 extends outwards to form a protrusion with a front inserting sheet 64, and the rear side edge is detached from the side edge to form a protrusion with a rear lower inserting sheet 65; the upper edges of the two side plates 62 extend upwards to form upper inserting sheets 66.

As shown in fig. 2 to 4, the outer contour dimension of the rear baffle 3 matches the inner contour dimension of the corresponding portion of the housing 1, the left and right sides of the rear baffle 3 are respectively provided with a notch 31 to form an air outlet channel, the notch 31 is communicated with the air outlet cavity 30, and the air flow of the air outlet cavity 30 flows out from the notches 31 at the two sides to form a strong rotation effect, so that the air flow can have a longer mixing path under a limited length, the mixing effect of the mixed air flow is better, and the mixing uniformity is higher. The rear baffle 3 has a rear upper slot 32 and a rear lower slot 33 on the plate surface.

As shown in fig. 1, 2, and 4, the rear upper insert piece 223 of the upper horizontal portion 22 of the partition 2 is inserted into the rear upper insertion groove 32 of the tailgate 3 to form a positioning structure, and positions the partition 2 and the tailgate 3. The front insert 64 of the crushing plate 6 is inserted into the front slot 211 of the front vertical plate portion 21 of the partition plate 2 to form a positioning structure, and the upper insert 66 of the crushing plate 6 is inserted into the upper slot 222 of the upper horizontal plate portion 22 of the partition plate 2 to form a positioning structure, so that the space between the partition plate 2 and the crushing plate 6 is positioned. The rear lower inserting piece 65 of the crushing plate 6 is inserted into the rear lower slot 33 of the back baffle plate 3 to form a positioning structure, and the crushing plate 6 and the back baffle plate 3 are positioned. Baffle 2, backplate 3, breaker 6 are provided with location structure each other respectively, fix a position through location structure, need not borrow the assistance-localization real-time of positioning fixture again, practice thrift the input cost of location frock, and then practiced thrift mixing arrangement's cost of manufacture.

In practical use, the device is arranged between a DPF (particle trap) component and an SCR (selective catalytic reduction) component of exhaust gas after-treatment; the urea nozzle in the nozzle seat 7 sprays urea liquid drops into the mixing pipe 4, tail gas is input from the output end of the DPF, air flow enters the mixing pipe 4 through the air inlet 41 of the mixing pipe 4 to be mixed with the urea liquid drops, flows downwards through the crushing barrel 5 to enter the mixing cavity 20, then continues to flow downwards through the crushing plate 6 to enter the air outlet cavity 30, flows out from the gaps 31 at the two sides of the rear baffle 3 and is output to the SCR assembly.

The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, as the utility model may be modified in any manner without departing from the spirit thereof.

Claims

1. A straight cylinder urea mixing arrangement which characterized in that: a partition plate (2) and a rear baffle plate (3) are arranged in the shell (1), the partition plate (2) is provided with a front vertical plate part (21) and an upper transverse plate part (22), the front vertical plate part (21) is connected with the front side edge of the upper transverse plate part (22), and the rear side edge of the upper transverse plate part (22) is connected to the rear baffle plate (3);

a crushing plate (6) is arranged between the front vertical plate part (21) and the rear baffle plate (3) and below the crushing cylinder (5), and the cavity on the front side of the rear baffle plate (3) is divided into an air inlet cavity (10), a mixing cavity (20) and an air outlet cavity (30) by the partition plate (2) and the crushing plate (6);

a mixing pipe (4) is inserted on the upper transverse plate part (22), the upper part of the mixing pipe (4) is positioned in the air inlet cavity (10), the lower part of the mixing pipe (4) extends into the mixing cavity (20), and the mixing pipe (4) is communicated with the air inlet cavity (10) and the mixing cavity (20);

the bottom of the mixing pipe (4) is inserted with a crushing barrel (5), a plurality of layers of blade groups which are arranged up and down are arranged in the barrel body of the crushing barrel (5), and each layer of blade group is provided with a plurality of crushing blades (51);

a plurality of second crushing holes (63) are formed in the crushing plate (6), and the second crushing holes (63) are communicated with the mixing cavity (20) and the air outlet cavity (30);

the rear baffle (3) is provided with a gap (31) to form an air outlet channel, and the gap (31) is communicated with the air outlet cavity (30).

2. The straight-barrel urea mixing device according to claim 1, wherein: the crushing blade (51) is provided with a plurality of first crushing holes (52).

3. The straight-barrel urea mixing device according to claim 1, wherein: the crushing blades (51) incline downwards in an inclined mode, a torsion angle of 10-15 degrees is formed between each crushing blade (51) and the horizontal line, and the inclination directions of all the crushing blades (51) are consistent.

4. The straight-barrel urea mixing device according to claim 1, wherein: the crushing blades (51) of the blade groups of the adjacent layers of the crushing barrel (5) are arranged in a staggered manner; the crushing blades (51) of the crushing barrel (5) are integrally formed on the barrel body.

5. The straight-barrel urea mixing device according to claim 1, wherein: a plurality of air inlet holes (41) are formed in the cylindrical wall surface of the tube portion of the air inlet cavity (10) on the mixing tube (4), an air inlet blade (42) is arranged on each air inlet hole (41), the air inlet blades (42) are inwards opened towards the inside of the mixing tube (4), the air inlet blades (42) incline downwards, and the included angle between each air inlet blade (42) and the vertical line ranges from 30 degrees to 60 degrees.

6. The straight-barrel urea mixing device according to claim 1, wherein: the crushing plate (6) is a U-shaped plate and is provided with a horizontal bottom plate (61) and side plates (62) at two sides, and a plurality of second crushing holes (63) are formed in the plate surface of the bottom plate (61) and the lower plate surfaces of the two side plates (62).

7. The straight-barrel urea mixing device according to claim 1, wherein: the outer contour dimension of the rear baffle (3) is matched with the inner contour dimension of the corresponding part of the shell (1), and two opposite sides of the rear baffle (3) are respectively provided with a notch (31).

8. The straight-barrel urea mixing device according to claim 1, wherein: the baffle (2), the rear baffle (3) and the crushing plate (6) are provided with a positioning structure respectively.

9. The straight-barrel urea mixing device according to claim 8, wherein: a rear upper inserting piece (223) is arranged on the rear side edge of the upper transverse plate portion (22) of the partition plate (2), a rear upper inserting groove (32) is formed in the rear baffle plate (3), and the rear upper inserting piece (223) of the upper transverse plate portion (22) penetrates through the rear upper inserting groove (32) of the rear baffle plate (3) to form a positioning structure between the partition plate (2) and the rear baffle plate (3);

a front slot (211) is formed in a front vertical plate portion (21) of the partition plate (2), an upper slot (222) is formed in an upper transverse plate portion (22), a front inserting piece (64) is arranged on the front side edge of a bottom plate (61) of the crushing plate (6), an upper inserting piece (66) is arranged on the upper edge of each two side plates (62), the front inserting piece (64) penetrates through the front slot (211) of the front vertical plate portion (21), the upper inserting piece (66) penetrates through the upper slot (222) of the upper transverse plate portion (22), and a positioning structure between the partition plate (2) and the crushing plate (6) is formed;

rear lower slots (33) are formed in the rear baffle plate (3), rear lower inserting pieces (65) are arranged on the rear side of a bottom plate (61) of the crushing plate (6), and the rear lower inserting pieces (65) penetrate through the rear lower slots (33) of the rear baffle plate (3) to form a positioning structure between the crushing plate (6) and the rear baffle plate (3).

10. The straight-barrel urea mixing device according to claim 1, wherein: the shell (1) is provided with a nozzle seat (7) corresponding to the mixing pipe (4).