High-temperature fatigue test platform for urea nozzle

Abstract

A urea nozzle high-temperature fatigue test platform relates to a test platform and comprises a control host, a high-temperature test platform, a fuel oil and urea supply system and a cooling liquid supply system. The high-temperature test platform comprises a rack, a combustion engine and a combustion chamber body, the combustion engine and the combustion chamber body are installed on the rack and communicated together, the combustion engine is used for providing a high-temperature environment for an exhaust pipe when an engine works, the combustion chamber body is provided with a tubular combustion chamber used for simulating the exhaust pipe, and the tubular combustion chamber is connected with a urea nozzle to be tested. A cooling water jacket is sleeved on the outer wall of the tubular combustion chamber; the output end of the fuel oil and urea supply system is connected with the input end of the urea nozzle; the input end and the output end of the cooling liquid supply system are connected with the cooling water jacket, and the control host is connected with the burner, the urea nozzle, the fuel oil and urea supply system and the cooling liquid supply system. According to the invention, the service life of the SCR nozzle can be tested as much as possible in a real environment, an optimal simulation state can be achieved, and the device has the characteristics of high safety, reliable performance and the like.

Description

Technical Field

[0001] The invention relates to a testing platform, in particular to a urea nozzle high temperature fatigue testing platform. Background Art

[0002] With the introduction of my country's National VI emission regulations, the emission requirements are getting higher and higher. In order to meet the emission requirements, in addition to optimizing the injector atomization design, increasing the system injection pressure, optimizing the air system and other measures to make the engine burn more fully, each car company has adopted another major measure, namely, exhaust post-treatment technology, including adding a three-way catalytic converter to the exhaust pipe, adding a particulate filter, and SCR post-exhaust treatment of diesel engines. Among them, SCR post-exhaust treatment is the main emission technology route for National VI diesel vehicles. With the maturity of the technology, car companies have also begun to apply it in large quantities, and the corresponding market demand for SCR nozzles is increasing. However, in the process of developing SCR nozzles, there is no urea nozzle high temperature fatigue test platform that can be used to scientifically evaluate the life test of SCR nozzles. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a high-temperature fatigue test platform for urea nozzles so as to simulate the exhaust emission environment of diesel vehicles and allow the SCR nozzles to be tested for life in a real environment as much as possible.

[0004] The technical solution to solve the above technical problems is: a urea nozzle high-temperature fatigue test platform, including a control host, a high-temperature test platform, a fuel and urea supply system, and a coolant supply system; the high-temperature test platform includes a frame, a burner installed on the frame and connected together, and a combustion chamber body, the burner is used to provide a high-temperature environment of the exhaust pipe when the engine is working, and the combustion chamber body is provided with a tubular combustion chamber for simulating the exhaust pipe, the tubular combustion chamber is connected to the urea nozzle to be tested, and a cooling water jacket is mounted on the outer wall of the tubular combustion chamber; the output end of the fuel and urea supply system is connected to the input end of the urea nozzle; the input and output ends of the coolant supply system are connected to the cooling water jacket, and the signal output end of the control host is respectively connected to the signal input ends of the burner, the urea nozzle, the fuel and urea supply system, and the coolant supply system.

[0005] A further technical solution of the present invention is: the platform is arranged in a split type, the combustion chamber body includes a combustion pipe, a flange, and a crystallization box, the inner cavity of the combustion pipe forms the tubular combustion chamber, the flange is respectively connected to the two ends of the combustion pipe, the combustion pipe is connected to the burner and the extended exhaust pipe through the flanges at both ends, and the crystallization box is connected to the bottom of the combustion pipe; the combustion pipe is respectively installed with an injector base, a sensor joint, and a water jacket adapter, and is connected to the urea nozzle through the injector base, connected to the temperature sensor through the sensor joint, connected to the cooling water jacket through the water jacket adapter, and the signal output end of the temperature sensor is connected to the signal input end of the control host.

[0006] A further technical solution of the present invention is: a flame stabilizing disk is also installed in the tubular combustion chamber, a central through hole is provided in the middle of the flame stabilizing disk, and a plurality of cut holes are evenly distributed along the central through hole toward the outer circumference.

[0007] A further technical solution of the present invention is: the cut hole is a trapezoidal structure, the small end of the cut hole is connected to the middle through hole, and the bevel angle of the cut hole is ɑ=30º~60º.

[0008] A further technical solution of the present invention is: the fuel and urea supply system includes a fuel tank rack, a fuel tank and a fuel pump respectively installed on the fuel tank rack, an input pipe of the fuel pump is connected to the fuel tank, an output pipe of the fuel pump is connected to the urea nozzle, and a pressure gauge and a pressure regulating valve are respectively installed on the output pipe of the fuel pump, the pressure gauge is connected to the signal input end of the control host, and the fuel pump and the pressure regulating valve are respectively connected to the signal output end of the control host.

[0009] A further technical solution of the present invention is that the output pipeline of the oil pump adopts a structure with high-pressure resistant hoses at both ends and a stainless steel pipe connected in the middle.

[0010] A further technical solution of the present invention is: a liquid level sensor is installed in the oil tank, and a liquid level sight gauge is also installed on the outer wall of the oil tank, and the signal output end of the liquid level sensor is connected to the signal input end of the control host.

[0011] A further technical solution of the present invention is: the coolant supply system includes a cooling rack, a mold temperature controller installed on the cooling rack, and an overflow valve, a flow meter, and a speed regulating valve are respectively installed on the output pipeline of the mold temperature controller, the flow meter is connected to the signal input end of the control host, and the mold temperature controller, the overflow valve, and the speed regulating valve are respectively connected to the signal output end of the control host.

[0012] A further technical solution of the present invention is: the control host includes a PLC, input buttons, and a touch screen, and the input buttons and the touch screen are respectively connected to the input end of the PLC.

[0013] Due to the above structure, the urea nozzle high temperature fatigue test platform of the present invention has the following beneficial effects compared with the prior art: 1. Allow SCR nozzles to be tested for life in a realistic environment The present invention comprises a control host, a high temperature test platform, a fuel and urea supply system, and a coolant supply system; wherein the high temperature test platform comprises a frame, a burner respectively installed on the frame and connected together, and a combustion chamber body, wherein the burner is used to provide a high temperature environment of an exhaust pipe when the engine is working, and the combustion chamber body is provided with a tubular combustion chamber for simulating the exhaust pipe. The control host controls the timing combustion by reading the exhaust gas and cooling water jacket temperature values ​​in real time, and at the same time adjusts the mold temperature controller to control the temperature of the circulating cooling water, so as to achieve the effect of simulating the exhaust pipe of an automobile, so that the life test of the SCR nozzle can be carried out in a real environment as much as possible, thereby scientifically evaluating the life of the SCR nozzle.

[0014] 2. Achieve the best simulation state In the combustion chamber, the atomized oil and gas sprayed by the burner will be blown to the front end of the combustion chamber due to the flow of air, causing the nozzle to burn on the flame. Not only is the temperature prone to be too high, but it will also be inconsistent with the normal exhaust pipe phenomenon and fail to achieve the best simulation state. If the wind force is reduced, the flame will move backward, but at this time there is less air, and the sprayed oil cannot be less, there will be more oil and less oxygen, resulting in incomplete combustion. At this time, the exhaust will emit thick smoke, and long-term use will even block the exhaust smoke. The present invention is equipped with a flame stabilizing disk in the tubular combustion chamber. When the air passes through the flame stabilizing disk, the airflow is in a vortex state, and the speed of the atomized oil mist is reduced, thereby achieving the effect of flame stabilization, which can not only achieve the best simulation state, but also ensure full combustion.

[0015] 3. High security The present application adopts a split structure, that is, the control host, high temperature test platform, fuel and urea supply system, and coolant supply system are separately arranged, which can avoid chain explosions of all devices caused by high temperature.

[0016] In addition, in the fuel and urea supply system of the present application, the output pipeline of the oil pump adopts a structure in which high-pressure hoses are connected at both ends and a stainless steel pipe is used in the middle to prevent the fire from burning from the pipeline to the fuel tank and causing an explosion.

[0017] 4. Reliable performance In the combustion chamber body of the present application, the combustion pipe is connected to the temperature sensor through a sensor joint, which can prevent the sensor from hitting the wall of the combustion pipe and causing temperature measurement errors, and its performance is relatively reliable.

[0018] 5. Green and environmentally friendly (2) In theory, if the burner burns fully, there will be no serious pollution problem. However, in reality, there is urea in it, which decomposes at high temperature to produce NH3+ and CO2. This application connects an extended exhaust pipe to the combustion pipeline, connects the exhaust pipe outlet to the wastewater tank, and then cleans the wastewater tank regularly.

[0019] 6. Simple structure, low cost, easy to promote and apply.

[0020] The technical features of a urea nozzle high temperature fatigue test platform of the present invention are further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 : A structural schematic diagram of a urea nozzle high temperature fatigue test platform of the present invention, Figure 2 : A schematic diagram of the structure of the high temperature test platform described in Example 1, Figure 3 : Schematic diagram of the main structure of the combustion chamber of the high temperature test platform described in Example 1, Figure 4 : A schematic diagram of the structure of the flame stabilizing disk described in Example 1, Figure 5 : A schematic diagram of the structure of the fuel and urea supply system of the first embodiment, Figure 6 : A schematic diagram of the structure of the cooling liquid supply system described in Example 1, Figure 7 : A control block diagram of the control host described in Embodiment 1; In the above drawings, the descriptions of the reference numerals are as follows: 1- Control host, 2-high temperature test platform, 21-frame, 22-burner, 23-combustion chamber body, 231-combustion pipe, 232-flange, 233-crystallization box, 234-injector base, 235-sensor connector, 236-water jacket adapter, 237-flame stabilizing plate, 2371-middle through hole, 2372-cut hole, 24-urea nozzle, 25-extended exhaust pipe, 3-Fuel and urea supply system, 31-Fuel tank rack, 32-Fuel tank, 33-Fuel pump, 34-Pressure gauge, 35-Pressure regulating valve, 4-Coolant supply system, 41-Cooling rack, 42-Mold temperature controller, 43-Overflow valve, 44-Flow meter, 45-Speed ​​regulating valve, 5-Power distribution cabinet. DETAILED DESCRIPTION

[0022] Embodiment 1

[0023] A urea nozzle high temperature fatigue test platform, which is a split type, including a control host 1, a high temperature test platform 2, a fuel and urea supply system 3, a coolant supply system 4, and a power distribution cabinet 5; wherein, The high temperature test platform 2 includes a frame 21, a burner 22 respectively mounted on the frame 21 and connected together, and a combustion chamber body 23. The combustion chamber body 23 is provided with a tubular combustion chamber for simulating an exhaust pipe, the tubular combustion chamber 23 is connected to a urea nozzle 24 to be tested, and a cooling water jacket is mounted on the outer wall of the tubular combustion chamber; the output end of the fuel and urea supply system 3 is connected to the input end of the urea nozzle 24; the input and output ends of the coolant supply system 4 are connected to the cooling water jacket, and the signal output end of the control host 1 is respectively connected to the signal input end of the burner 22, the urea nozzle 24, the fuel and urea supply system 3, and the coolant supply system 4, wherein the control host 1 drives the urea nozzle 24 to spray fuel through the injector drive plate.

[0024] The combustion chamber body 23 includes a combustion pipe 231, a flange 232, and a crystallization box 233. The inner cavity of the combustion pipe 231 forms the tubular combustion chamber. The combustion pipe 231 is connected to the output end of the burner 22. The flange 232 is connected to both ends of the combustion pipe 231. The combustion pipe 231 is connected to the burner 22 and the extended exhaust pipe 25 through the flanges 232 at both ends. The crystallization box 233 is connected to the bottom of the combustion pipe 231. The combustion pipe 231 is respectively installed with an injector base 234, a sensor connector 235, and a water jacket adapter 236. The combustion pipe 231 is connected to the urea nozzle 24 through the injector base 231, connected to the temperature sensor through the sensor connector 235, and connected to the cooling water jacket through the water jacket adapter 236. The temperature sensor is a PT100 temperature sensor. The signal output end of the temperature sensor is connected to the signal input end of the control host 1 so as to transmit the detected exhaust temperature value and cooling water jacket temperature value to the control host 1.

[0025] The combustion chamber is also provided with a flame stabilizing plate 237, the middle of which is provided with a central through hole 2371, and 12 cut holes 2372 are evenly distributed along the central through hole 2371 toward the periphery. The cut holes 2372 are of a trapezoidal structure, the small end of the cut holes 2372 is connected to the central through hole 2371, and the bevel angle of the cut holes 2372 is ɑ=30º~60º.

[0026] The fuel and urea supply system 3 includes a fuel tank frame 31, a fuel tank 32 and a fuel pump 33 respectively mounted on the fuel tank frame 31, the input pipeline of the fuel pump 33 is connected to the fuel tank 32, the output pipeline of the fuel pump 33 is connected to the urea nozzle 24, and a pressure gauge 34 and a pressure regulating valve 35 are respectively installed on the output pipeline of the fuel pump 33, the pressure gauge 34 is connected to the signal input end of the control host 1, and the fuel pump 33 and the pressure regulating valve 35 are respectively connected to the signal output end of the control host 1. The output pipeline of the fuel pump 33 adopts a structural mode in which high-pressure hoses are connected at both ends and a stainless steel pipe is used in the middle.

[0027] A stainless steel AD type liquid level sensor is installed in the oil tank 32. The signal output end of the liquid level sensor is connected to the signal input end of the control host 1, and the oil tank 32 is also equipped with a liquid level observation ruler on the outer wall. By adopting a dual liquid level detection method, it is convenient for users and inspectors to observe whether there is oil in the oil tank.

[0028] The cooling liquid supply system 4 includes a cooling rack 41, a mold temperature controller 42 installed on the cooling rack 41, and an overflow valve 43, a flow meter 44, and a speed regulating valve 45 are respectively installed on the output pipeline of the mold temperature controller 42. The flow meter 44 is connected to the signal input end of the control host 1, and the mold temperature controller 42, the overflow valve 43, and the speed regulating valve 44 are respectively connected to the signal output end of the control host 1. The present invention controls the temperature of the cooling liquid through the mold temperature controller, sets the required temperature, and the mold temperature controller automatically controls the temperature and flow rate of the cooling liquid to make the cooling water jacket reach the required temperature.

[0029] The power distribution cabinet 5 is used to provide power to the control host 1, the high temperature test platform 2, the fuel and urea supply system 3, and the coolant supply system 4 respectively.

[0030] The control host 1 integrates the drive control and high temperature control functions of the urea nozzle, and monitors the working status and related liquid level of the fuel and urea supply system 3. The control host 1 includes a PLC, input buttons, and a touch screen. The input buttons, touch screen, temperature sensor, liquid level sensor, pressure gauge, and flow meter are respectively connected to the signal input end of the PLC, and the signal output end of the PLC is respectively connected to the injector drive board, the burner 22, the oil pump 33, the pressure regulating valve 35, the mold temperature controller 42, the overflow valve 43, and the speed regulating valve 44.

[0031] In the high temperature test platform 2, the burner 22 is used to provide a high temperature environment for the exhaust pipe when the engine is working. The burner adopts the existing IO control type machine, and controls the air intake fan and the electromagnetic pump respectively through the two contactors inside. Before ignition, the air intake fan first sends in air with a certain wind speed and air volume. After about 20 seconds of pre-blowing, the pulse combustion oil is used to increase the pressure of the oil pump to 600 to 700 KPa. At the same time, the oil outlet solenoid valve is opened, and the oil mist sprayed from the urea nozzle is punctured by the electric spark and ignited to form a flame. The oxygen in the combustion chamber is continuously blown in by the fan and burns with the atomized diesel.

Claims

1. A urea nozzle high temperature fatigue test platform, characterized in that: The invention comprises a control host (1), a high temperature test platform (2), a fuel and urea supply system (3), and a coolant supply system (4); the high temperature test platform (2) comprises a frame (21), a burner (22) respectively mounted on the frame (21) and connected together, and a combustion chamber body (23); the burner (22) is used to provide a high temperature environment of an exhaust pipe when the engine is working; the combustion chamber body (23) is provided with a tubular combustion chamber for simulating an exhaust pipe; the tubular combustion chamber (23) is connected to a urea nozzle (24) to be tested; a cooling water jacket is mounted on the outer wall of the tubular combustion chamber; the output end of the fuel and urea supply system (3) is connected to the input end of the urea nozzle (24); the input and output ends of the coolant supply system (4) are connected to the cooling water jacket; the signal output end of the control host (1) is respectively connected to the signal input ends of the burner (22), the urea nozzle (24), the fuel and urea supply system (3), and the coolant supply system (4).

2. A urea nozzle high temperature fatigue test platform according to claim 1, characterized in that: The platform is a split type arrangement. The combustion chamber body (23) comprises a combustion pipe (231), a flange (232), and a crystallization box (233). The inner cavity of the combustion pipe (231) forms the tubular combustion chamber. The flange (232) is respectively connected to the two ends of the combustion pipe (231). The combustion pipe (231) is connected to the burner (22) and the extended exhaust pipe (25) through the flanges (232) at the two ends. The crystallization box (233) is connected to the bottom of the combustion pipe (231). The combustion pipe (231) is respectively installed with an injector base (234), a sensor connector (235), and a water jacket adapter (236). The combustion pipe (231) is connected to the urea nozzle (24) through the injector base (231), connected to the temperature sensor through the sensor connector (235), and connected to the cooling water jacket through the water jacket adapter (236). The signal output end of the temperature sensor is connected to the signal input end of the control host (1).

3. A urea nozzle high temperature fatigue test platform according to claim 2, characterized in that: A flame stabilizing disc (237) is also installed in the tubular combustion chamber. A central through hole (2371) is provided in the middle of the flame stabilizing disc (237), and a plurality of cut holes (2372) are evenly distributed along the central through hole (2371) toward the outer circumference.

4. A urea nozzle high temperature fatigue test platform according to claim 3, characterized in that: The cut hole (2372) is a trapezoidal structure, the small end of the cut hole (2372) is connected to the middle through hole (2371), and the bevel angle ɑ of the cut hole (2372) is 30° to 60°.

5. The urea nozzle high temperature fatigue test platform according to claim 1, characterized in that: The fuel and urea supply system (3) comprises a fuel tank frame (31), a fuel tank (32) and a fuel pump (33) respectively mounted on the fuel tank frame (31); an input pipe of the fuel pump (33) is connected to the fuel tank (32); an output pipe of the fuel pump (33) is connected to a urea nozzle (24); a pressure gauge (34) and a pressure regulating valve (35) are respectively mounted on the output pipe of the fuel pump (33); the pressure gauge (34) is connected to a signal input end of a control host (1); and the fuel pump (33) and the pressure regulating valve (35) are respectively connected to a signal output end of the control host (1).

6. A urea nozzle high temperature fatigue test platform according to claim 5, characterized in that: The output pipeline of the oil pump (33) adopts a structure with high-pressure resistant hoses at both ends and a stainless steel pipe connected in the middle.

7. The urea nozzle high temperature fatigue test platform according to claim 5, characterized in that: A liquid level sensor is installed in the oil tank (32), and a liquid level sight gauge is also installed on the outer wall of the oil tank (32). The signal output end of the liquid level sensor is connected to the signal input end of the control host (1).

8. The urea nozzle high temperature fatigue test platform according to claim 1, characterized in that: The coolant supply system (4) comprises a cooling rack (41) and a mold temperature controller (42) mounted on the cooling rack (41); an overflow valve (43), a flow meter (44), and a speed regulating valve (45) are respectively mounted on the output pipeline of the mold temperature controller (42); the flow meter (44) is connected to the signal input end of the control host (1); and the mold temperature controller (42), the overflow valve (43), and the speed regulating valve (44) are respectively connected to the signal output end of the control host (1).

9. The urea nozzle high temperature fatigue test platform according to claim 1, characterized in that: The control host (1) comprises a PLC, input buttons and a touch screen, wherein the input buttons and the touch screen are respectively connected to the input end of the PLC.

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