Large-flow urea injection system based on air-assisted atomizing nozzle

Abstract

The utility model discloses a high-flow urea injection system based on an air-assisted atomizing nozzle, which comprises a urea pump unit, an air valve unit and a controller connected with the urea pump unit, the urea pump unit comprises a urea inlet, a compressed air inlet and a mixing cavity connected between the urea inlet and the compressed air inlet, the air valve unit comprises a first communicating pipeline, a second communicating pipeline and a nozzle, the two ends of the first communicating pipeline communicate with the mixing cavity and the nozzle correspondingly, and the two ends of the second communicating pipeline communicate with the mixing cavity and the nozzle correspondingly. The two ends of the second communicating pipeline communicate with the compressed air inlet and the nozzle correspondingly. According to the urea atomization device, urea and compressed air enter the mixing cavity to be mixed and then are fed into the nozzle, meanwhile, the compressed air can directly enter the nozzle, and therefore after secondary gas-liquid mixing is conducted in the nozzle, a urea atomization solution can be sprayed through the nozzle, and the atomization effect is further improved.

Description

Technical Field

[0001] This utility model relates to a high-flow-rate urea injection system based on an air-assisted atomizing nozzle. Background Technology

[0002] Conventional gas-assisted SCR urea supply and injection systems have a small flow rate, making them unsuitable for high-flow-rate applications such as marine engines. After increasing the flow rate of the urea supply module, the proportion of liquid fluid increases while the proportion of gas fluid decreases, resulting in uneven gas-liquid mixing. This leads to poor nozzle atomization and larger liquid particle diameters, failing to meet the requirements for SCR urea injection. Utility Model Content

[0003] The main objective of this invention is to provide a high-flow-rate urea injection system based on an air-assisted atomizing nozzle, in order to solve the aforementioned technical problems.

[0004] To achieve the above objectives, this utility model proposes a high-flow urea injection system based on an air-assisted atomizing nozzle, comprising a urea pump unit, an air valve unit, and a controller. The urea pump unit includes a urea inlet, a compressed air inlet, and a mixing chamber connected between the urea inlet and the compressed air inlet. The air valve unit includes a first connecting pipe, a second connecting pipe, and a nozzle. The two ends of the first connecting pipe are respectively connected to the mixing chamber and the nozzle, and the two ends of the second connecting pipe are respectively connected to the compressed air inlet and the nozzle.

[0005] In one embodiment, the urea pump unit further includes a first filter screen disposed between the mixing chamber and the urea inlet.

[0006] In one embodiment, the urea pump unit further includes a urea pump body disposed between the mixing chamber and the first filter screen.

[0007] In one embodiment, the urea pump unit further includes a second filter disposed between the mixing chamber and the compressed air inlet.

[0008] In one embodiment, the urea pump unit further includes a first electromagnetic on / off valve disposed between the mixing chamber and the second filter screen.

[0009] In one embodiment, the urea pump unit further includes a pressure sensor disposed on the mixing chamber and connected to the controller.

[0010] In one embodiment, the air valve unit further includes a second solenoid on / off valve disposed between the nozzle and the compressed air inlet.

[0011] In the technical solution of this utility model, the high-flow urea injection system based on an air-assisted atomizing nozzle includes a urea pump unit, an air valve unit, and a controller connected to the urea pump unit. The urea pump unit includes a urea inlet, a compressed air inlet, and a mixing chamber connected between the urea inlet and the compressed air inlet. The air valve unit includes a first connecting pipe, a second connecting pipe, and a nozzle. The two ends of the first connecting pipe are respectively connected to the mixing chamber and the nozzle, and the two ends of the second connecting pipe are respectively connected to the compressed air inlet and the nozzle.

[0012] Therefore, in this technical solution, urea and compressed air are mixed in the mixing chamber and then sent into the nozzle. At the same time, compressed gas can also directly enter the nozzle, so that secondary gas-liquid mixing can be carried out in the nozzle and then the urea atomized solution is sprayed from the nozzle, further improving the atomization effect. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of a high-flow urea injection system based on an air-assisted atomizing nozzle, according to an embodiment of the present invention.

[0015] Reference numerals: 10. Urea pump unit; 11. Urea inlet; 12. Compressed air inlet; 13. First filter screen; 14. Second filter screen; 15. Urea pump body; 16. Pressure sensor; 17. First solenoid on / off valve; 20. Air valve unit; 21. First connecting pipe; 22. Second connecting pipe; 23. Nozzle; 24. Second solenoid on / off valve; 30. Controller.

[0016] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0019] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0021] This invention provides a high-flow-rate urea injection system based on an air-assisted atomizing nozzle.

[0022] like Figure 1 As shown, the high-flow urea injection system based on an air-assisted atomizing nozzle provided in this embodiment of the present invention includes a urea pump unit 10, an air valve unit 20, and a controller 30 connected to the urea pump unit 10. The urea pump unit 10 includes a urea inlet 11, a compressed air inlet 12, and a mixing chamber connected between the urea inlet 11 and the compressed air inlet 12. The air valve unit 20 includes a first connecting pipe 21, a second connecting pipe 22, and a nozzle 23. The two ends of the first connecting pipe 21 are respectively connected to the mixing chamber and the nozzle 23, and the two ends of the second connecting pipe 22 are respectively connected to the compressed air inlet 12 and the nozzle 23.

[0023] In this embodiment, urea and compressed air are mixed in the mixing chamber and then sent into the nozzle 23. At the same time, compressed gas can also directly enter the nozzle 23, so that secondary gas-liquid mixing can be carried out in the nozzle 23 and then the urea atomized solution is sprayed from the nozzle 23, further improving the atomization effect.

[0024] The urea pump unit 10 further includes a first filter 13 disposed between the mixing chamber and the urea inlet 11 and a second filter 14 disposed between the mixing chamber and the compressed air inlet 12, thereby enabling the filtration of urea and compressed air and improving the quality of the subsequent urea atomization solution.

[0025] The urea pump unit 10 also includes a urea pump body 15 disposed between the mixing chamber and the first filter screen 13, so that urea can be pumped in through the urea pump body 15. The urea pump body 15 is connected to the controller 30, so that it can be remotely controlled through the controller 30.

[0026] In addition, the urea pump unit 10 further includes a first solenoid on / off valve 17 disposed between the mixing chamber and the second filter screen 14, and the air valve unit 20 further includes a second solenoid on / off valve 24 disposed between the nozzle 23 and the compressed air inlet 12. In this application, the first solenoid on / off valve 17 is a built-in pressure regulating valve, while the second solenoid on / off valve 24 is an external pressure regulating valve. This application achieves the accuracy and atomization effect during high-flow injection by using two pressure regulating valves, one built-in and one external, to meet the injection requirements of after-treatment systems for large-displacement engines such as marine engines. At the same time, it simplifies the structure of the nozzle 23 and reduces the cost of the injection system and the nozzle 23.

[0027] In the above embodiment, the urea pump unit 10 further includes a pressure sensor 16, which is disposed on the mixing chamber and connected to the controller 30. Therefore, the pressure in the mixing chamber can be monitored by the pressure sensor 16, and monitoring can be achieved through signal transmission with the controller 30.

[0028] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A high-flow-rate urea injection system based on an air-assisted atomizing nozzle, characterized in that, The high-flow urea injection system based on an air-assisted atomizing nozzle includes a urea pump unit (10), an air valve unit (20), and a controller (30). The urea pump unit (10) includes a urea inlet (11), a compressed air inlet (12), and a mixing chamber (18) connected between the urea inlet (11) and the compressed air inlet (12). The air valve unit (20) includes a first connecting pipe (21), a second connecting pipe (22), and a nozzle (23). The two ends of the first connecting pipe (21) are connected to the mixing chamber (18) and the nozzle (23), respectively. The two ends of the second connecting pipe (22) are connected to the compressed air inlet (12) and the nozzle (23), respectively.

2. The high-flow-rate urea injection system based on an air-assisted atomizing nozzle according to claim 1, characterized in that, The urea pump unit (10) also includes a first filter (13) disposed between the mixing chamber (18) and the urea inlet (11).

3. The high-flow-rate urea injection system based on an air-assisted atomizing nozzle according to claim 2, characterized in that, The urea pump unit (10) also includes a urea pump body (15) disposed between the mixing chamber and the first filter (13).

4. The high-flow-rate urea injection system based on an air-assisted atomizing nozzle according to claim 1, characterized in that, The urea pump unit (10) also includes a second filter (14) disposed between the mixing chamber and the compressed air inlet (12).

5. The high-flow-rate urea injection system based on an air-assisted atomizing nozzle according to claim 4, characterized in that, The urea pump unit (10) also includes a first electromagnetic on / off valve (17) disposed between the mixing chamber and the second filter (14).

6. The high-flow-rate urea injection system based on an air-assisted atomizing nozzle according to claim 1, characterized in that, The urea pump unit (10) also includes a pressure sensor (16), which is located on the mixing chamber (18) and connected to the controller (30).

7. The high-flow-rate urea injection system based on an air-assisted atomizing nozzle according to claim 1, characterized in that, The air valve unit (20) further includes a second solenoid on / off valve (24) disposed between the nozzle (23) and the compressed air inlet (12).

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