CN212671899U

CN212671899U - Urea solution atomizer and urea solution injection apparatus

Info

Publication number: CN212671899U
Application number: CN202020962791.7U
Authority: CN
Inventors: 宋永平; 臧志成; 刘德文; 曾伟; 夏兴兰; 高殿朋; 刘印; 赵晓东
Original assignee: Kailong High Technology Co Ltd
Current assignee: Kailong High Technology Co Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-03-09
Anticipated expiration: 2030-05-29

Abstract

The utility model discloses a urea solution atomizer, it includes whirl piece and throttle piece, the upper portion of whirl piece is just to the urea solution liquid outlet, and set up the water conservancy diversion way that extends to whirl piece side surface on the upper surface, set up the blind hole of inside extension on the lower surface of whirl piece, the throttle piece dress inlays in the drill way of blind hole, thereby form the whirl chamber in the inside of whirl piece, set up the whirl groove of inside extension on the side surface of whirl piece, the whirl groove is with water conservancy diversion way and whirl chamber intercommunication, the bell mouth has been seted up on the upper surface of throttle piece, set up the orifice that extends to the bell mouth on the lower surface, thereby outwards switch on the whirl chamber. The atomizer has a certain tangential speed when urea solution is sprayed out of the throttling hole, so that liquid drops are broken, a smaller atomization particle size is formed, the atomization quality is optimized, and the atomization effect is remarkable. The utility model also discloses a urea solution injection apparatus.

Description

Urea solution atomizer and urea solution injection apparatus

Technical Field

The utility model belongs to the technical field of the internal-combustion engine tail gas aftertreatment technique and specifically relates to a urea solution atomizer and urea solution injection apparatus for diesel engine selectivity catalytic conversion system is related to.

Background

Diesel aftertreatment systems typically employ a selective catalytic reduction system SCR to remove nitrogen oxides contained in the exhaust. Therefore, the urea aqueous solution is required to be sprayed into the exhaust pipe, ammonia gas is formed through hydrolysis and pyrolysis, and then nitrogen oxides are catalytically reduced into harmless nitrogen and water through the catalytic carrier, so that the purpose of tail gas treatment is realized. In order to meet increasingly stringent emissions regulations, diesel aftertreatment systems have increasingly high injection accuracy requirements for urea injection systems. The electric control airless urea-assisting nozzle can accurately realize urea injection with fixed time and quantity, is not limited by a compressed air source in the application process, and gradually becomes the main stream of the market.

The supply pressure of the urea solution injection system is typically 400-900 kPa, which is a low pressure injection. Under the condition of no air assistance, the existing atomizer structure is difficult to realize good atomization effect, and the spray particle size is larger. The urea solution is sprayed into the exhaust pipe, liquid films are easily formed on the head of the nozzle, the mixer and the pipe wall, urea crystallization is caused, the exhaust pipe is blocked, exhaust emission exceeds standard, and even an engine can be damaged under severe conditions. The above problems become key problems for successful application of urea solution injection devices, and need to be solved urgently.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a urea solution atomizer to there is the poor and great problem of spraying particle diameter of atomization effect in the atomizer that is used for diesel engine selectivity catalytic conversion system among the solution prior art.

Another object of the utility model is to provide a urea solution injection apparatus to there is the injection apparatus who is used for diesel engine selectivity catalytic conversion system among the solution prior art and easily causes the urea crystallization, blocks up exhaust pipe's problem.

In order to achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a urea solution atomizer, it includes whirl piece and throttle piece, the upper portion of whirl piece is just to the urea solution liquid outlet, and set up the water conservancy diversion way that extends to whirl piece side surface on the upper surface, set up the blind hole of inside extension on the lower surface of whirl piece, the throttle piece dress inlays in the drill way of blind hole, thereby form the whirl chamber in the inside of whirl piece, set up the whirl groove of inside extension on the side surface of whirl piece, the whirl groove is with water conservancy diversion way and whirl chamber intercommunication, the bell mouth has been seted up on the upper surface of throttle piece, set up the orifice that extends to the bell mouth on the lower surface, thereby outwards switch on the whirl chamber.

Particularly, the plurality of swirl grooves are circumferentially and uniformly distributed on the periphery of the swirl cavity and are eccentrically connected with the swirl cavity.

In particular, the eccentricity of the swirl slots is not greater than the difference in radii of the swirl chamber and the swirl slots.

Particularly, the sectional area of the flow guide channel, the sectional area of the rotational flow groove and the sectional area of the throttling hole are sequentially reduced.

In particular, the flow leader does not extend to the lower surface of the vortex block.

In particular, the orifice hole transitions into engagement with the tapered hole fillet.

In particular, the lower surface of the swirl block is flush with the lower surface of the throttle block.

A urea solution spraying device comprises an ejector main body, a guide pipe, a valve body assembly and the urea solution atomizer, wherein the guide pipe is communicated with a liquid outlet of the ejector main body, the valve body assembly is arranged in the guide pipe to control a flow passage of the guide pipe to be smooth or blocked, and the urea solution atomizer is arranged at the end part of the guide pipe to form sealing.

Particularly, the upper surface of a rotational flow block of the urea solution atomizer is attached to the valve body assembly, the urea solution passes through a rotational flow groove of the urea solution atomizer to obtain tangential speed, the breaking of liquid drops is accelerated, the atomized particle size is reduced, and finally the urea solution is sprayed out from a throttling hole of the urea solution atomizer.

Particularly, the valve body assembly comprises a valve seat and a sealing steel ball driven by an armature, the valve seat is sealed and fixed with the inner wall of the guide pipe, the lower surface of the valve seat is attached to the rotational flow block, a cavity is formed in the upper surface of the valve seat, a through hole penetrating to the lower surface of the valve seat is formed in the bottom of the cavity, the sealing steel ball moves up and down in the cavity, and when the sealing steel ball moves to a lower limit position, the sealing steel ball forms spherical surface sealing on the through hole.

To sum up, adopt above-mentioned structure urea solution atomizer and urea solution injection apparatus, steerable urea solution gets into the whirl chamber through the whirl groove, form circumference tangential velocity in the whirl intracavity, the conical surface of whirl chamber bottom can reduce the loss of circumference tangential velocity, and then certain tangential velocity has when making urea solution blowout orifice, accelerate the breakage of liquid drop, form less atomizing particle diameter, optimize the atomizing quality, the atomization effect is showing, and the urea crystallization that current injection apparatus appears easily has been improved, block up exhaust pipe scheduling problem.

Drawings

FIG. 1 is a schematic structural diagram of a urea solution atomizer provided by an embodiment of the present invention;

FIG. 2 is a schematic internal view of a urea solution atomizer according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a urea solution spraying device provided by an embodiment of the present invention;

FIG. 4 is an enlarged view at A in FIG. 3;

FIG. 5 is a schematic flow diagram of the urea solution of FIG. 3 with the valve body assembly open.

Detailed Description

The technical solution of the present invention will be clearly and completely described with reference to the accompanying drawings.

Referring to fig. 1 to 5, the present embodiment provides a urea solution atomizer, which includes a cyclone block 1 and a throttle block 2.

Offer the water conservancy diversion 3 that extends to the 1 side surface of whirl piece on the upper surface of whirl piece 1, set up the blind hole of inside extension on the lower surface of whirl piece 1, throttle piece 2 dress inlays in the drill way of blind hole, both interference fit, thereby form whirl chamber 4 in the inside of whirl piece 1, set up the whirl groove 5 of inside extension on the side surface of whirl piece 1, whirl groove 5 communicates water conservancy diversion 3 and whirl chamber 4, bell mouth 6 has been seted up on the upper surface of throttle piece 2, set up on the lower surface and extend to the orifice 7 of bell mouth 6,

orifice

7 and 6 fillet transitional coupling of bell mouth, thereby outwards switch on whirl chamber 4.

The rotational flow block 1 is manufactured by machining, wherein the rotational flow groove 5 is manufactured by one or more methods of electric spark, laser and machining, the manufacturing is convenient, the production precision is controllable, and the cost is low. The throttle block 2 is manufactured by machining, wherein the throttle hole 7 is manufactured by one or more methods of electric spark, laser and machining, so that the throttle block is convenient to manufacture, controllable in production precision and low in cost.

Wherein, a plurality of whirl grooves 5 are evenly distributed on the periphery of the whirl chamber 4 in the circumferential direction and eccentrically connected with the whirl chamber, and four whirl grooves 5 are exemplified in the embodiment.

It is emphasized that the eccentricity of the swirl slots 5 should be no greater than the difference between the radii of the swirl chamber 4 and the swirl slots 5, and the edges of the swirl slots 5 should be tangential to the swirl chamber 4 to provide sufficient swirl tangential force. The sectional area of the guide flow passage 3, the sectional area of the swirl flow groove 5 and the sectional area of the orifice 7 are decreased in sequence to provide sufficient external jet force.

In addition, the diversion channel 3 does not extend to the lower surface of the cyclone block 1, and the lower surface of the cyclone block 1 is flush with the lower surface of the throttling block 2, so that the urea solution enters the cyclone cavity 4 according to the upper surface of the cyclone block 1 and is finally sprayed out of the throttling hole 7.

The embodiment also provides a urea solution spraying device which comprises an injector main body 8, a guide pipe 9, a valve body assembly and the urea solution atomizer. The guide pipe 9 is communicated with a liquid outlet of the ejector main body 8, the valve body assembly is arranged in the guide pipe 9, a flow passage of the guide pipe 9 is controlled to be smooth or blocked, and the urea solution atomizer is arranged at the end part of the guide pipe 9 and forms sealing.

The valve body assembly comprises a valve seat 10 and a sealing steel ball 11 driven by an armature 18, the valve seat 10 is fixed with the inner wall of the guide pipe 9 in a sealing mode, the lower surface of the valve seat 10 is attached to the rotational flow block 1, a cavity 12 is formed in the upper surface of the valve seat, a through hole 13 penetrating to the lower surface of the valve seat 10 is formed in the bottom of the cavity 12, the sealing steel ball 11 moves up and down in the cavity 12, and when the sealing steel ball 11 moves to a lower limit position, the sealing steel ball 11 forms spherical sealing on the through hole 13.

Specifically, the center magnet 14 is fitted to the upper end of the guide tube 9, and the guide tube 9 and the center magnet 14 are fixed by laser welding in an interference fit. A solenoid valve 15 is fitted outside the guide tube 9, and the solenoid valve 15 and the guide tube 9 are fixed together by an injection molded body 16. The guide tube 9 has an outward flange at its upper end, which forms a ring groove with the injection molded body 16 for mounting a sealing ring 17. The armature 18, the armature rod 19 and the sealing steel ball 11 are assembled into a whole through laser welding, the armature 18 is made of magnetic materials, the armature rod 19 and the armature 18 form a groove for placing the spring 20, the top of the spring 20 is in contact with the pressure adjusting block 21, the position of the pressure adjusting block 21 can be changed, and the pre-tightening force of the spring 20 can be adjusted. The valve seat 10 is in interference fit with the guide tube 9, the valve seat 10 is in contact with the sealing steel ball 11, and the gap between the armature 18 and the central magnet 14 can be controlled by changing the axial position of the valve seat 10, wherein the gap value is usually 0.05 mm-0.2 mm.

The upper surface of the cyclone block 1 of the urea solution atomizer is attached to the valve body assembly, and the urea solution passes through the cyclone groove 5 of the urea solution atomizer to obtain a certain tangential speed, so that the liquid drops are broken, the atomized particle size is reduced, and finally the urea solution is sprayed out from the throttle hole 7 of the urea solution atomizer.

The above embodiments have been merely illustrative of the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and does not depart from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a urea solution atomizer, its characterized in that, includes whirl piece and throttle piece, the upper portion of whirl piece is just to the urea solution liquid outlet, and sets up the water conservancy diversion way that extends to whirl piece side surface on the upper surface, set up the blind hole of inside extension on the lower surface of whirl piece, the throttle piece dress inlay in the drill way of blind hole to form the whirl chamber in the inside of whirl piece, set up the whirl groove of inside extension on the side surface of whirl piece, the whirl groove will the water conservancy diversion way with whirl chamber intercommunication, the bell mouth has been seted up on the upper surface of throttle piece, set up on the lower surface and extend to the orifice of bell mouth, thereby outwards switch on the whirl chamber.

2. A urea solution atomizer according to claim 1, characterized in that: the plurality of swirl grooves are circumferentially and uniformly distributed on the periphery of the swirl cavity and are eccentrically connected with the swirl cavity.

3. A urea solution atomizer according to claim 2, characterized in that: the eccentricity of the swirl groove is not more than the radius difference of the swirl cavity and the swirl groove.

4. A urea solution atomizer according to claim 1, characterized in that: the sectional area of the flow guide channel, the sectional area of the swirl groove and the sectional area of the throttling hole are sequentially reduced in a decreasing manner.

5. A urea solution atomizer according to claim 1, characterized in that: the flow guide channel does not extend to the lower surface of the vortex block.

6. A urea solution atomizer according to claim 1, characterized in that: the throttling hole is in transition connection with the round angle of the conical hole.

7. A urea solution atomizer according to claim 1, characterized in that: the lower surface of the rotational flow block is flush with the lower surface of the throttling block.

8. A urea solution spraying device, which is characterized by comprising an injector main body, a guide pipe, a valve body assembly and the urea solution atomizer as claimed in any one of claims 1 to 7, wherein the guide pipe is communicated with a liquid outlet of the injector main body, the valve body assembly is arranged in the guide pipe and controls the flow passage of the guide pipe to be unblocked or blocked, and the urea solution atomizer is arranged at the end part of the guide pipe and forms a seal.

9. The urea solution injection apparatus according to claim 8, wherein: the upper surface of the rotational flow block of the urea solution atomizer is attached to the valve body assembly, urea solution passes through the rotational flow groove of the urea solution atomizer to obtain tangential speed, so that liquid drops are broken, the atomized particle size is reduced, and finally, the urea solution is sprayed out from the throttle hole of the urea solution atomizer.

10. The urea solution injection apparatus according to claim 9, wherein: the valve body assembly comprises a valve seat and a sealing steel ball driven by an armature, the valve seat is sealed and fixed with the inner wall of the guide pipe, the lower surface of the valve seat is attached to the cyclone block, a cavity is formed in the upper surface of the valve seat, a through hole penetrating to the lower surface of the valve seat is formed in the bottom of the cavity, the sealing steel ball moves up and down in the cavity, and when the sealing steel ball moves to a lower limit position, the sealing steel ball forms spherical sealing for the through hole.