Urea spraying device
By introducing a heating module into the urea injection device to heat the urea injection device and discharging residual urea when the vehicle is shut down, the problem of urea crystal blockage caused by too low temperature is solved, and the uniformity of urea injection and the safety of the equipment are improved.
Patent Information
- Application Number
- CN202421761047.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-24
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-07-24
AI Technical Summary
When the temperature is too low, urea produces crystallization in the exhaust passage, resulting in the spray gun blockage, the urea injection is uneven, the reduction effect is reduced, and the pipeline pressure suddenly increases, resulting in an overpressure failure.
A urea injection device is designed, including a heating module, which heats the urea through heating pipes, heating copper wires and heating rods to avoid crystallization and discharge the remaining urea through an air pump when the vehicle is shut down to prevent blockage.
It effectively avoids the blockage problem caused by urea crystallization, ensures the uniformity of urea injection and the reduction effect, and reduces the fluctuations in pipeline pressure and improves the safety of equipment use.
Smart Images
Figure CN222879746U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of waste gas treatment, in particular to a urea injection device. Background Art
[0002] When an automobile internal combustion engine, such as a diesel engine, is working, in most cases, it will produce nitrogen oxides (NOx) accompanied by excess oxygen, which will cause environmental pollution. In order to meet increasingly stringent emission requirements and reduce nitrogen oxide emissions, it is necessary to reduce NOx in the exhaust gas into nitrogen and water. Usually, before the exhaust gas enters the catalyst, a urea aqueous solution is injected into the exhaust gas as a reducing agent to achieve the reduction of NOx. This work is specifically achieved by the urea supply pump sucking urea solution from the urea tank and pumping it into the exhaust gas in the exhaust pipe.
[0003] However, during use, when the temperature is too low, the urea remaining in the exhaust passage will crystallize. Crystallization can easily cause the spray gun to become clogged during use, resulting in uneven urea spraying and reduced reduction effect. It can also cause a sudden increase in pipeline pressure, leading to overpressure failure of the pipeline and pump.
[0004] Therefore, it is necessary to invent a urea injection device to solve the above problems. Utility Model Content
[0005] The utility model aims to provide a urea injection device to solve the problem that when the temperature is too low, the urea remaining in the exhaust passage will crystallize, and the crystallization will easily cause the spray gun to be blocked during use, resulting in uneven urea injection, reduced reduction effect, and a sudden increase in pipeline pressure, resulting in overpressure failure of the pipeline and pump.
[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a urea injection device, comprising a urea box, a supply pump is fixedly installed on the right side of the urea box, a heating module is arranged on the right side of the supply pump, the heating module comprises a heating pipeline, an infusion inner tube, a heating copper wire, a first liquid inlet valve, a discharge valve, an injection pipe, a second liquid inlet valve and a heating rod, the right end of the discharge valve is fixedly connected with the second connecting pipeline, the right end of the second connecting pipeline is fixedly connected with a three-way valve, the right end valve port of the three-way valve is fixedly connected with the third connecting pipeline, the right end of the third connecting pipeline is fixedly connected with the second liquid inlet valve, the upper end valve port of the three-way valve is fixedly connected with the gas pipeline, the upper end of the gas pipeline is fixedly connected with the air pump, and the lower end of the injection pipe is fixedly connected with the injection head.
[0007] By adopting the above technical solution, the supply pump transports urea to the injection pipe and sprays it outward through the injection head. In cold weather, the heating module heats the urea to prevent crystallization during use. In addition, after the vehicle stops, the air pump transports gas to the inside of the injection head through the third connecting pipe, and then discharges the residual urea in the pipe to the outside, avoiding crystallization caused by long-term residue in the pipe and clogging of the pipe.
[0008] Optionally, the first liquid inlet valve is fixedly connected to the left end of the infusion inner tube, and a first temperature sensor is fixedly connected to the surface of the first liquid inlet valve.
[0009] By adopting the above technical solution, the first temperature sensor detects the temperature of urea entering the inner infusion tube.
[0010] Optionally, the left end of the first liquid inlet valve is fixedly connected to a first connecting pipe, and the left end of the first connecting pipe is fixedly connected to the liquid outlet of the supply pump.
[0011] By adopting the above technical solution, the supply pump transports urea to the inside of the infusion inner tube through the first connecting pipe.
[0012] Optionally, the drain valve is fixedly connected to the right end of the infusion inner tube, and a second temperature sensor is fixedly connected to the surface of the drain valve.
[0013] By adopting the above technical solution, the second temperature sensor detects the temperature of urea discharged from the infusion inner tube.
[0014] Optionally, the inner infusion tube is fixed inside the heating pipe, the heating copper wire is covered inside the inner infusion tube, the left and right ends of the surface of the heating pipe are fixedly connected with first connecting blocks, the two ends of the heating copper wire are respectively fixedly connected to two groups of first connecting blocks, and the upper end of the first connecting block is fixedly connected with a first cable.
[0015] By adopting the above technical solution, when it is detected that the urea temperature is too low, the controller energizes the heating copper wire to heat the inner infusion tube, thereby heating the urea flowing through, thereby preventing urea crystals from clogging the connecting pipe.
[0016] Optionally, the second liquid inlet valve is fixedly connected to the surface of the injection pipe, and a third temperature sensor is fixedly connected to the surface of the second liquid inlet valve.
[0017] By adopting the above technical solution, the third temperature sensor is used to detect the temperature of urea entering the injection pipe.
[0018] Optionally, the heating rod is fixed inside the injection pipe, and the upper end of the injection pipe is fixedly connected to a second connecting block.
[0019] Optionally, the upper end of the heating rod is fixedly connected to the second connecting block, and the upper end of the second connecting block is fixedly connected to the second cable.
[0020] By adopting the above technical solution, when the temperature of urea entering the injection pipe is too low, the heating rod heats the urea inside the injection pipe again to prevent urea crystals from clogging the injection head.
[0021] In the above technical solution, the technical effects and advantages provided by the utility model are:
[0022] The utility model heats urea through a heating module to avoid crystallization during use. In addition, after the vehicle stops running, the air pump transports gas to the inside of the injection head through the third connecting pipe, and then discharges the urea remaining in the pipe to the outside, avoiding crystallization caused by long-term residue in the pipe, and then avoiding blockage of the pipe and the injection head, thereby improving the safety of equipment use and solving the problem that when the temperature is too low, urea remaining in the exhaust passage will produce crystals, and crystallization will easily cause the spray gun to be blocked during use, resulting in uneven urea injection, reduced reduction effect, and sudden increase in pipeline pressure, resulting in overpressure failure of the pipeline and the pump. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0024] Figure 2 This is a schematic diagram of the external structure of the heating pipeline of the utility model;
[0025] Figure 3 This is a schematic diagram of the internal structure of the heating pipeline of the utility model;
[0026] Figure 4 This is a schematic diagram of the external structure of the injection pipe of the utility model;
[0027] Figure 5 It is a schematic diagram of the internal structure of the injection pipe of the utility model.
[0028] Description of reference numerals:
[0029] 1. Urea tank; 11. Supply pump; 2. Heating pipe; 21. Inner infusion tube; 22. Heating copper wire; 23. First connecting block; 24. First cable; 25. First inlet valve; 26. First temperature sensor; 27. First connecting pipe; 28. Discharge valve; 29. Second connecting pipe; 210. Second temperature sensor; 3. Three-way valve; 31. Gas pipeline; 32. Air pump; 33. Third connecting pipe; 4. Injection pipe; 41. Second inlet valve; 42. Third temperature sensor; 43. Second connecting block; 44. Heating rod; 45. Second cable. DETAILED DESCRIPTION
[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0031] The utility model provides Figures 1 to 5 A urea injection device shown in the figure comprises a urea box 1, a supply pump 11 is fixedly installed on the right side of the urea box 1, a heating module is arranged on the right side of the supply pump 11, the heating module comprises a heating pipeline 2, an infusion inner tube 21, a heating copper wire 22, a first liquid inlet valve 25, a liquid discharge valve 28, an injection pipe 4, a second liquid inlet valve 41 and a heating rod 44, a second connecting pipeline 29 is fixedly connected to the right end of the liquid discharge valve 28, a three-way valve 3 is fixedly connected to the right end of the second connecting pipeline 29, a third connecting pipeline 33 is fixedly connected to the right end of the three-way valve 3, the right end of the third connecting pipeline 33 is fixedly connected to the second liquid inlet valve 41, the second liquid inlet valve 41 is fixedly connected to the surface of the injection pipe 4, an air pipeline 31 is fixedly connected to the upper end of the three-way valve 3, an air pump 32 is fixedly connected to the upper end of the air pipeline 31, and an injection head is fixedly connected to the lower end of the injection pipe 4.
[0032] During use, the valve port at the upper end of the three-way valve 3 is closed, and the supply pump 11 transports urea from the inside of the urea tank 1 to the inside of the infusion inner tube 21. At this time, the heating copper wire 22 heats the infusion inner tube 21, and then heats the urea just discharged to avoid long-distance transportation causing urea to crystallize inside the connecting pipe. At the same time, when the urea flows into the injection pipe 4, the heating rod 44 heats the urea again so that the urea can be quickly discharged from the injection head to avoid crystallization inside the injection head. In addition, when the vehicle stops running, the supply pump 11 stops transporting urea, and the air pump 32 starts running. At this time, the valve port at the left end of the three-way valve 3 is closed. At this time, the air pump 32 transports air to the inside of the third connecting pipe 33 and the injection pipe 4 in sequence, and discharges the residual urea in the pipe to the outside to avoid urea accumulation inside the pipe, thereby preventing urea crystals from clogging the pipe and the injection head.
[0033] See also Figures 1 to 3The first liquid inlet valve 25 is fixedly connected to the left end of the infusion inner tube 21, and a first temperature sensor 26 is fixedly connected to the surface of the first liquid inlet valve 25. The left end of the first liquid inlet valve 25 is fixedly connected to the first connecting pipe 27, and the left end of the first connecting pipe 27 is fixedly connected to the liquid outlet of the supply pump 11. The drain valve 28 is fixedly connected to the right end of the infusion inner tube 21, and a second temperature sensor 210 is fixedly connected to the surface of the drain valve 28. The infusion inner tube 21 is fixed inside the heating pipe 2, and the heating copper wire 22 is covered inside the infusion inner tube 21. The left and right ends of the surface of the heating pipe 2 are fixedly connected with the first connecting blocks 23, and the two ends of the heating copper wire 22 are respectively fixedly connected to the two groups of first connecting blocks 23. The upper end of the first connecting block 23 is fixedly connected to the first cable 24.
[0034] Specifically, the first temperature sensor 26 detects the temperature of urea entering the infusion inner tube 21. When it is detected that the urea temperature is too low, the controller energizes the heating copper wire 22 to heat the infusion inner tube 21, thereby heating the urea flowing through to prevent urea crystals from clogging the connecting pipe. When urea flows out of the infusion inner tube 21, the second temperature sensor 210 detects the temperature of the urea entering and flowing out.
[0035] See also Figure 4 and Figure 5 A third temperature sensor 42 is fixedly connected to the surface of the second liquid inlet valve 41, a heating rod 44 is fixed inside the injection pipe 4, a second connecting block 43 is fixedly connected to the upper end of the injection pipe 4, the upper end of the heating rod 44 is fixedly connected to the second connecting block 43, and a second cable 45 is fixedly connected to the upper end of the second connecting block 43.
[0036] In addition, the third temperature sensor 42 detects the temperature of urea flowing into the injection pipe 4, and then determines whether the urea needs to be heated. When the urea temperature is low, the controller energizes the heating rod 44, and the heating rod 44 heats the urea flowing through to prevent the urea from crystallizing inside the injection head. Even if the urea in the injection head crystallizes, the heated urea can melt the crystals and spray them out quickly, thereby keeping the injection head unobstructed and effectively improving the safety of equipment use.
[0037] The working principle of the utility model is as follows: the heating module heats the urea twice to avoid crystallization during use. In addition, after the vehicle is turned off, the air pump 32 transports the gas to the inside of the injection head through the third connecting pipe 33, and then discharges the third connecting pipe 33, the injection pipe 4 and the residual urea in the injection head to the outside, avoiding crystallization caused by long-term residue in the pipe, thereby avoiding blockage of the pipe and the injection head, and improving the safety of equipment use.
[0038] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only preferred examples of the utility model, and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.
Claims
1. A urea injection device, comprising a urea tank (1), characterized in that: A supply pump (11) is fixedly mounted on the right side of the urea tank (1). A heating module is arranged on the right side of the supply pump (11). The heating module comprises a heating pipeline (2), an inner liquid infusion tube (21), a heating copper wire (22), a first liquid inlet valve (25), a liquid discharge valve (28), an injection pipe (4), a second liquid inlet valve (41) and a heating rod (44). The right end of the liquid discharge valve (28) is fixedly connected to a second connecting pipeline (29). The right end of the second connecting pipeline (29) is fixedly connected to a three-way valve (3). The right end of the valve port of the three-way valve (3) is fixedly connected to a third connecting pipeline (33). The right end of the third connecting pipeline (33) is fixedly connected to the second liquid inlet valve (41). The upper end of the valve port of the three-way valve (3) is fixedly connected to a gas pipeline (31). The upper end of the gas pipeline (31) is fixedly connected to an air pump (32). The lower end of the injection pipe (4) is fixedly connected to an injection head.
2. A urea injection device according to claim 1, characterized in that: The first liquid inlet valve (25) is fixedly connected to the left end of the infusion inner tube (21), and a first temperature sensor (26) is fixedly connected to the surface of the first liquid inlet valve (25).
3. A urea injection device according to claim 2, characterized in that: The left end of the first liquid inlet valve (25) is fixedly connected to a first connecting pipe (27), and the left end of the first connecting pipe (27) is fixedly connected to the liquid outlet of the supply pump (11).
4. A urea injection device according to claim 1, characterized in that: The drain valve (28) is fixedly connected to the right end of the infusion inner tube (21), and a second temperature sensor (210) is fixedly connected to the surface of the drain valve (28).
5. A urea injection device according to claim 1, characterized in that: The infusion inner tube (21) is fixed inside the heating pipe (2), the heating copper wire (22) is wrapped inside the infusion inner tube (21), the left and right ends of the surface of the heating pipe (2) are fixedly connected to first connection blocks (23), the two ends of the heating copper wire (22) are respectively fixedly connected to two groups of first connection blocks (23), and the upper end of the first connection block (23) is fixedly connected to a first cable (24).
6. A urea injection device according to claim 1, characterized in that: The second liquid inlet valve (41) is fixedly connected to the surface of the injection pipe (4), and a third temperature sensor (42) is fixedly connected to the surface of the second liquid inlet valve (41).
7. A urea injection device according to claim 1, characterized in that: The heating rod (44) is fixed inside the injection pipe (4), and the upper end of the injection pipe (4) is fixedly connected to a second connection block (43).
8. A urea injection device according to claim 1, characterized in that: The upper end of the heating rod (44) is fixedly connected to the second connection block (43), and the upper end of the second connection block (43) is fixedly connected to a second cable (45).