CN211314344U - Mixer - Google Patents

Abstract

The utility model discloses a mixer, include: the device comprises a shell, a front baffle, a rear baffle, a flow guide pipe and a flow guide plate; an air inlet is arranged on the front baffle; the rear baffle is provided with a flow guide hole; one end of the flow guide pipe is annular and is communicated with the flow guide hole; the guide plate is arc-shaped, the left end of the guide plate is connected with the edge of the opening of the guide pipe, and the right end of the guide plate is attached to the inner wall of the shell; and the gas can enter the guide pipe under the guidance of the pipe wall of the guide pipe and the guide plate. In the mixer, tail gas enters through the air inlet of the front baffle and meets urea spray in a mixing cavity formed by the front baffle and the rear baffle in an enclosing manner; because the guide plate and the guide pipe are arranged between the front baffle and the rear baffle, the mixed gas can spirally flow and advance under the guide of the guide pipe and the guide plate, enters the guide pipe and finally flows out of the mixing cavity from the guide hole. When the mixed gas is swirled and moves forward, the two gases can be fully mixed, the degree of mixing of tail gas and urea spray is improved, and urea crystallization is avoided.

Description

Mixer

Technical Field

The utility model relates to a diesel engine aftertreatment technical field, more specifically say, relate to a blender.

Background

In the face of increasingly serious atmospheric pollution, the national emission requirement on diesel engines is getting stricter, the non-road state four-emission regulation is about to be implemented, and the development of products meeting the non-road state four-emission standard is not slow.

The mixer is used for fully mixing the tail gas of the engine and the urea spray so as to improve NO_XThe conversion efficiency of (2) and the reduction of pollutant emission. However, the design of the traditional mixer has certain defects, which easily cause urea crystallization and influence the mixing degree of the tail gas and the urea spray.

Therefore, the problem to be solved in the field is to improve the mixing degree of the engine exhaust and the urea at the present stage.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a mixer, this mixer can improve the mixed degree of engine exhaust and urea, has solved the difficult problem in this field of present stage.

A mixer, comprising:

a housing;

the front baffle is provided with an air inlet;

the rear baffle is provided with a flow guide hole, the rear baffle and the front baffle are arranged in the shell and can form a mixing cavity in an enclosing manner, and the side wall of the mixing cavity is provided with a urea inlet;

the two ends of the flow guide pipe are respectively abutted against the front baffle and the rear baffle, the side wall of the flow guide pipe is provided with an opening, one end of the flow guide pipe is annular, and the other end of the flow guide pipe is semi-annular; one end of the flow guide pipe which is annular is communicated with the flow guide hole;

the guide plate is arc-shaped, and the upper end and the lower end of the guide plate are respectively abutted against the front baffle and the rear baffle; the left end of the guide plate is connected with the edge of the opening of the guide pipe, and the right end of the guide plate is attached to the inner wall of the shell; and the gas can enter the guide pipe under the guidance of the pipe wall of the guide pipe and the guide plate.

Preferably, the mixer further comprises a rectifying plate provided with a plurality of rectifying holes, the rectifying plate is located in the shell, and gas passing through the rear baffle plate enters the rectifying plate, the rear baffle plate and a rectifying cavity surrounded by the shell.

Preferably, the mixer has a plurality of the rectifying holes uniformly distributed on the rectifying plate.

Preferably, the mixer is provided with a plurality of through holes on the rear baffle; the gas guided by the draft tube and the guide plate can pass through the through holes and the guide holes of the rear baffle.

Preferably, the mixer, the through hole and the air inlet are respectively located on two sides of the guide plate.

Preferably, in the mixer, the flow guide plate has the same bending tendency as the flow guide pipe.

The utility model provides a mixer, include: the device comprises a shell, a front baffle, a rear baffle, a flow guide pipe and a flow guide plate; an air inlet is arranged on the front baffle; the rear baffle is provided with a flow guide hole, the rear baffle and the front baffle are arranged in the shell and can be enclosed into a mixing cavity, and the side wall of the mixing cavity is provided with a urea inlet; the two ends of the flow guide pipe are respectively abutted against the front baffle and the rear baffle, the side wall of the flow guide pipe is provided with an opening, one end of the flow guide pipe is annular, and the other end of the flow guide pipe is semi-annular; one end of the flow guide pipe is annular and is communicated with the flow guide hole; the guide plate is arc-shaped, and the upper end and the lower end of the guide plate are respectively abutted against the front baffle and the rear baffle; the left end of the guide plate is connected with the edge of the opening of the guide pipe, and the right end of the guide plate is attached to the inner wall of the shell; and the gas can enter the guide pipe under the guidance of the pipe wall of the guide pipe and the guide plate. In the mixer, tail gas enters through the air inlet of the front baffle and meets urea spray in a mixing cavity formed by the front baffle and the rear baffle in an enclosing manner; because the guide plate and the guide pipe are arranged between the front baffle and the rear baffle, the mixed gas can spirally flow and advance under the guide of the guide pipe and the guide plate, enters the guide pipe and finally flows out of the mixing cavity from the guide hole. In the process of the mixed gas swirling forward, the two gases can be fully mixed, the degree of mixing of the tail gas and the urea spray is improved, and the urea crystallization is avoided. Therefore, the utility model provides a mixer can improve the mixed degree of engine exhaust and urea, has solved the difficult problem in this field of present stage.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a mixer in an embodiment of the present invention;

FIG. 2 is a schematic view of a front baffle in an embodiment of the present invention;

FIG. 3 is a schematic view of a tailgate according to an embodiment of the present invention;

FIG. 4 is a schematic view of a rectifying plate according to an embodiment of the present invention;

FIG. 5 is a schematic view of a baffle according to an embodiment of the present invention;

fig. 6 is a schematic view of a draft tube according to an embodiment of the present invention.

In fig. 1-6:

a housing-1; a front baffle-2; an air inlet-3; a tailgate-4; a diversion hole-5; a mixing chamber-6; urea inlet-7; a flow guide pipe-8; an opening-9; a deflector-10; a rectifying hole-11; a rectifying plate-12; a rectification chamber-13; a through hole-14.

Detailed Description

The core of the specific embodiment is to provide a mixer, which can improve the mixing degree of the engine tail gas and the urea, and solves the problem in the field at the present stage.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.

The mixer provided by the present embodiment includes: the device comprises a shell 1, a front baffle 2, a rear baffle 4, a draft tube 8 and a guide plate 10; an air inlet 3 is arranged on the front baffle 2; the rear baffle 4 is provided with a flow guide hole 5, the rear baffle 4 and the front baffle 2 are arranged in the shell 1 and can form a mixing cavity 6 in an enclosing manner, and the side wall of the mixing cavity 6 is provided with a urea inlet 7; two ends of the flow guide pipe 8 are respectively abutted against the front baffle 2 and the rear baffle 4, the side wall of the flow guide pipe 8 is provided with an opening 9, one end of the flow guide pipe is annular, and the other end of the flow guide pipe is semi-annular; one end of the flow guide pipe 8 which is annular is communicated with the flow guide hole 5; the guide plate 10 is arc-shaped, and the upper end and the lower end of the guide plate 10 are respectively abutted against the front baffle plate 2 and the rear baffle plate 4; the left end of the guide plate 10 is connected with the edge of the opening 9 of the guide pipe 8, and the right end of the guide plate 10 is attached to the inner wall of the shell 1; and the gas enters the draft tube 8 under the guidance of the wall of the draft tube 8 and the deflector plate 10.

In the mixer, tail gas of an engine enters through the air inlet 3 of the front baffle 2 and meets urea spray in a mixing cavity 6 enclosed by the front baffle 2 and the rear baffle 4; because the guide plate 10 and the guide pipe 8 are arranged between the front baffle 2 and the rear baffle 4, the mixed gas can advance in a swirling flow under the guide of the guide pipe 8 and the guide plate 10, enters the guide pipe 8 and finally flows out of the mixing cavity 6 from the guide hole 5. In the process of the mixed gas swirling forward, the tail gas of the engine and the urea spray can be better mixed together, so that the degree of mixing of the tail gas and the urea spray is improved, and the effect of avoiding urea crystallization is achieved.

Therefore, the utility model provides a mixer can improve the mixed degree of engine exhaust and urea, has solved the difficult problem in this field of present stage. Please refer to fig. 1-6.

It should be noted that the upper end and the lower end mentioned in the present embodiment are both based on the placing direction of fig. 1; and the left end and the right end of the air deflector 10 respectively refer to two sides except the upper end and the lower end of the air deflector 10, namely the left end and the right end. Please refer to fig. 1.

The mixer provided by the present embodiment may further include a rectifying plate 12 having a plurality of rectifying holes 11, wherein the rectifying plate 12 is located in the casing 1, and the gas passing through the back baffle 4 enters a rectifying cavity 13 enclosed by the rectifying plate 12, the back baffle 4 and the casing 1. After the mixed gas enters the rectifying cavity 13 from the mixing cavity 6, the mixed gas can flow out of the mixer from the rectifying holes 11, and the design of the rectifying plate 12 can further improve the uniformity of gas flow mixing, so that the conversion efficiency of the gas entering the SCR catalytic reaction unit is improved, and the discharged tail gas meets the requirement of the regulation limit value.

Furthermore, the plurality of rectifying holes 11 of the mixer can be uniformly distributed on the rectifying plate 12, so that the uniformity of the mixed gas is better improved.

In the mixer provided by the present embodiment, the back baffle 4 may further have a plurality of through holes 14; the gas guided through the draft tube 8 and the guide plate 10 passes through the through holes 14 and the guide holes 5 of the rear baffle 4. That is, the tail gas entering the mixing chamber 6 can be fully mixed with the urea spray, and the air flow can enter the flow guiding pipe 8 under the guiding of the flow guiding pipe 8 and the flow guiding plate 10, at this time, the air flow with the higher speed can directly pass through the through hole 14 and enter the rectifying chamber 13, and the air flow with the relatively lower speed can pass through the flow guiding hole 5 and enter the rectifying chamber 13, so that the tail gas and the urea spray can be fully mixed.

In order to better guide the gas and make the mixed gas realize swirling flow by the guide plate 10 and the guide pipe 8, the through holes 14 and the gas inlets 3 can be respectively arranged at two sides of the guide plate 10, as shown in fig. 1.

In the mixer provided by the embodiment, the bending trend of the guide plate 10 is the same as that of the guide pipe 8, and the arrangement can guide the flow direction of the air flow more smoothly, so that the mixed gas smoothly enters the guide pipe 8 and finally enters the rectifying cavity 13 from the through hole 14 and the guide hole 5; meanwhile, the generation of urea crystals can be avoided.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. A mixer, comprising:

a housing (1);

the front baffle (2), the said front baffle (2) has air inlets (3);

the rear baffle (4) is provided with a flow guide hole (5), the rear baffle (4) and the front baffle (2) are arranged in the shell (1) and can enclose a mixing cavity (6), and a urea inlet (7) is formed in the side wall of the mixing cavity (6);

the two ends of the flow guide pipe (8) are respectively abutted against the front baffle (2) and the rear baffle (4), the side wall of the flow guide pipe (8) is provided with an opening (9), one end of the flow guide pipe is annular, and the other end of the flow guide pipe is semi-annular; one end of the flow guide pipe (8) which is annular is communicated with the flow guide hole (5);

the guide plate (10) is arc-shaped, and the upper end and the lower end of the guide plate (10) are respectively abutted against the front baffle (2) and the rear baffle (4); the left end of the guide plate (10) is connected with the edge of the opening (9) of the guide pipe (8), and the right end of the guide plate (10) is attached to the inner wall of the shell (1); and the gas enters the draft tube (8) under the guidance of the tube wall of the draft tube (8) and the guide plate (10).

2. The mixer according to claim 1, further comprising a rectifying plate (12) provided with a plurality of rectifying holes (11), wherein the rectifying plate (12) is located in the housing (1), and the gas passing through the back baffle (4) enters a rectifying cavity (13) enclosed by the rectifying plate (12), the back baffle (4) and the housing (1).

3. The mixer according to claim 2, characterized in that a plurality of the flow-straightening holes (11) are evenly distributed over the flow-straightening plate (12).

4. The mixer according to claim 1, characterized in that said backplate (4) is also provided with a plurality of through holes (14); the gas guided through the flow guide pipe (8) and the flow guide plate (10) passes through the through holes (14) and the flow guide holes (5) of the rear baffle plate (4).

5. A mixer according to claim 4, wherein the through-hole (14) and the inlet aperture (3) are located on either side of the deflector (10).

6. The mixer according to claim 1, characterized in that the deflector (10) has the same tendency to bend as the draft tube (8).

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