Fuel nozzle test and back pressure regulation system

Abstract

The present application relates to fuel test equipment technical field, specifically relates to fuel nozzle test and counter pressure regulating system;Adopt explosion-proof servo motor and explosion-proof pressure sensor constitute closed loop control, combine high pressure, low pressure proportional back pressure valve, can be accurately regulated and kept to high pressure loop and low pressure loop respectively, to realize the stable control to counter pressure cavity and nozzle test pressure, flow, ensure that test data is reliable;Adopt multiple check valve, multistage overflow valve and pressure reducing valve etc., when the element fails, can block the backflow and release the excess oil, also can manual operation release, prevent the backflow of oil from causing overpressure, improve the overall safety redundancy of system;Pressure sensor and pressure gauge are arranged at multiple key positions, can real-time acquisition, observation pressure value, ensure that each position pressure is stable and controllable;Multiple accumulators are arranged, can absorb pulsation, reduce the influence of pressure fluctuation on test result and element life, improve the precision and reduce the fatigue damage of pump and pipeline.

Description

Technical Field

[0001] This invention relates to the field of fuel testing equipment technology, specifically to a fuel injector testing and back pressure adjustment system. Background Technology

[0002] The nozzles of aircraft engines require fuel injection tests to ensure their performance. During performance testing, a back pressure chamber is usually set up at the nozzle to simulate the actual pressure environment under engine operating conditions. Existing test devices mostly rely on mechanical overflow valves or single pressure regulating valves to adjust the pressure in the back pressure chamber. However, since the fuel flow rate changes in real time with the nozzle injection state, the pressure in the back pressure chamber fluctuates greatly, has a lag in response, and is not precise in adjustment, making it difficult to maintain stable test conditions. Fuel is a flammable medium, and pressure fluctuations not only affect the accuracy of test data but also pose certain safety risks. Furthermore, when some pressure regulating components fail, it can easily cause overpressure or backflow in the back pressure chamber, posing a significant safety risk. Summary of the Invention

[0003] The purpose of this invention is to address the deficiencies and shortcomings of the prior art by providing a reasonably designed fuel injector testing and back pressure adjustment system that can solve the aforementioned deficiencies.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: It includes an oil tank with casters at the bottom. A pressure pump assembly is installed on the oil tank. The oil outlet pipe of the pressure pump assembly is connected to an oil circuit block 1 via a check valve 1 and a high-pressure oil pipe 2. The oil circuit block 1 has an inlet oil circuit and a return oil circuit. An overflow valve 1 is installed on the oil circuit block 1. The inlet oil circuit is directly connected to the return oil circuit via a throttle valve. The return oil circuit is connected to the oil tank via a high-pressure oil pipe 3. The inlet oil circuit has two outputs: one is connected to a high-pressure filter installed on it for output, and the other is directly connected to the outlet. A ball valve 2 is connected to the outlet of the high-pressure filter. The rear end of the ball valve 2 is connected to two ball valves 1 via a high-pressure oil pipe 4. The rear end of one of the ball valves 1 is connected to an electro-proportional pressure reducing valve. The outlet of the electro-proportional pressure reducing valve is connected to a check valve 1. The rear end of ball valve one is directly connected to the rear end of check valve two. Ball valve three is connected to the rear end of check valve two, and annular mounting valve block for connecting test ring is connected to the rear end of ball valve three. The outlet of the oil inlet in oil circuit block one is also connected to ball valve two. Its rear end is connected to an explosion-proof logic valve through a high-pressure oil pipe, and the high-pressure oil pipe is connected to the control end of the explosion-proof logic valve. Port B of the explosion-proof logic valve is connected to the annular mounting valve block, and port A is connected to the oil tank through a high-pressure proportional back pressure valve. In the oil circuit of the annular mounting valve block, it is also connected to the oil tank through a low-pressure proportional back pressure valve and relief valve two. High-pressure ball valve two is installed in the oil circuit between relief valve two, explosion-proof logic valve and annular mounting valve block. The oil circuit of the annular mounting valve block is also connected to the oil tank through high-pressure ball valve three.

[0005] Preferably, multiple accumulators are connected to the oil circuit within the annular mounting valve block via a high-pressure ball valve.

[0006] Preferably, the oil tank is also equipped with a return oil pump group, which is connected to an oil circuit block two. The return oil pump group is connected to a one-way valve three located on the oil circuit block two, and then connected to a filter one and a filter two in sequence. Then, it is connected to the main oil tank through a high-pressure oil pipe one. An overflow valve three and a pressure gauge two are also provided on the oil line at the rear end of the one-way valve three.

[0007] Preferably, both the oil inlet line of the oil circuit block one and the oil line of the annular mounting valve block are equipped with an explosion-proof pressure sensor and a pressure gauge one.

[0008] Preferably, the pressure pump assembly includes an internal gear pump, the rear end of which is connected to an explosion-proof servo motor via a coupling, and a bell-shaped cover is provided on the outside. An oil suction filter is provided at the oil suction port of the internal gear pump.

[0009] Preferably, the return oil pump assembly includes an explosion-proof motor, which is connected to an oil pump via a second coupling, and an oil suction filter is provided on the oil pump suction port.

[0010] Preferably, the oil tank is equipped with a filler neck, an oil level gauge, an explosion-proof liquid level and temperature sensor, and an explosion-proof junction box for installing the control unit.

[0011] Preferably, the annular mounting valve block is provided with a pressure testing connector connected to its internal oil circuit.

[0012] The beneficial effects of the present invention after adopting the above structure are: This application employs an explosion-proof servo motor and an explosion-proof pressure sensor to form a closed-loop control system. Combined with high-pressure and low-pressure proportional back pressure valves, the high-pressure and low-pressure circuits can be precisely adjusted and maintained respectively, thereby achieving stable control of the test pressure and flow rate of the back pressure chamber and nozzle, ensuring reliable test data.

[0013] This application employs multiple check valves, multi-stage relief valves, and pressure reducing valves, which can block backflow and release excess oil when components fail. It can also be manually operated to prevent oil backflow from causing overpressure and improve the overall safety redundancy of the system.

[0014] This application sets up pressure sensors and pressure gauges at multiple key locations to collect and observe pressure values ​​in real time, ensuring that the pressure at each location is stable and controllable.

[0015] This application incorporates multiple accumulators to absorb pulsations, reduce the impact of pressure fluctuations on test results and component lifespan, improve accuracy, and reduce fatigue damage to pumps and pipelines.

[0016] This application uses a small oil tank and valve assembly for easy movement and transportation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the present invention; Figure 2 This is an external structural diagram of the present invention; Figure 3 This is a rear structural diagram of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Oil tank; 2. Filler neck; 3. Oil level gauge; 4. Explosion-proof liquid level and temperature sensor; 5. Explosion-proof junction box; 6. Explosion-proof servo motor; 7. Internal gear pump; 8. Coupling 1; 9. Suction filter 1; 10. Casters; 11. Check valve 1; 12. Manifold block 1; 13. Overflow valve 1; 14. Throttle valve; 15. Ball valve 1; 16. Ball valve 2; 17. High-pressure filter; 18. Electro-proportional pressure reducing valve; 19. Check valve 2; 20. Explosion-proof pressure sensor; 21. Pressure gauge 1; 22. High-pressure oil pipe 1; 23. High-pressure oil pipe 2; 24. High pressure... 25. Oil pipe 3; 26. Pressure test connector; 27. Accumulator; 28. High-pressure ball valve 1; 29. ​​Annular mounting valve block; 301. Explosion-proof logic valve; 302. Low-pressure proportional back pressure valve; 31. High-pressure ball valve 2; 32. High-pressure ball valve 3; 33. Relief valve 2; 34. High-pressure oil pipe 4; 35. Suction filter 2; 36. Explosion-proof motor; 37. Oil pump; 38. Coupling 2; 39. Oil manifold block 2; 40. Check valve 3; 41. Relief valve 3; 42. Pressure gauge 2; 43. Filter 1; 44. Filter 2; 45. Ball valve 3. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] See Figures 1-3As shown, it includes a fuel tank 1, using RP-3 aviation fuel, tested with an aircraft engine 23 fuel injector. All electronic components in contact with the fuel are explosion-proof. The bottom of the fuel tank 1 is equipped with casters 10. The fuel tank 1 has a filler neck 2, a fuel level gauge 3, an explosion-proof liquid level and temperature sensor 4, and an explosion-proof junction box 5 for installing the control unit. The explosion-proof junction box 5 contains a control PLC. A pressure pump assembly is installed on the fuel tank 1. The oil outlet pipe of the pressure pump assembly is connected to the oil manifold block 12 via a one-way valve 11 and a high-pressure oil pipe 23. The oil manifold block 12 has an inlet and a return oil path. An overflow valve 13 is installed on the oil manifold block 12. The inlet oil path is directly connected to the return oil path via a throttle valve 14, and the return oil path is connected to the high-pressure oil pipe 24. Connect to oil tank 1. The oil inlet is divided into two outputs: one is connected to the high-pressure filter 17 installed on it, and the other is directly connected to the outlet. The outlet of the high-pressure filter 17 is connected to ball valve 2 16. The rear end of ball valve 2 16 is connected to two ball valves 1 15 via high-pressure oil pipe 4 34. The rear end of one ball valve 1 15 is connected to an electric proportional pressure reducing valve 18. The outlet of the electric proportional pressure reducing valve 18 is connected to a check valve 2 19. The rear end of the other ball valve 1 15 is directly connected to the rear end of check valve 2 19. The rear end of check valve 2 19 is connected to ball valve 3 45. The rear end of ball valve 3 45 is connected to an annular mounting valve block 28 for connecting the test ring. Each nozzle is equipped with an independent back pressure chamber and is equipped with a check valve, a pressure sensor, and a proportional pressure reducing valve. The overflow valve, under positive pressure and check valve action, prevents oil backflow and can monitor the pressure data of each chamber in real time. It can also overflow excess oil to prevent overpressure, and the oil sprayed from the nozzle flows back into the oil tank 1. The outlet of the oil inlet in the oil circuit block 12 is also connected to the ball valve 2 16. Its rear end is connected to the explosion-proof logic valve 29 through a high-pressure oil pipe. The high-pressure oil pipe is connected to the control end of the explosion-proof logic valve 29. The B port of the explosion-proof logic valve 29 is connected to the annular mounting valve block 28, and the A port is connected to the oil tank 1 through the high-pressure proportional back pressure valve 302. The oil circuit of the annular mounting valve block 28 is also connected to the oil tank 1 through the low-pressure proportional back pressure valve 301 and the overflow valve 2 33, respectively. The overflow valve 2 33, the explosion-proof logic valve 29 and the annular mounting valve 28 are connected to the oil tank 1 through the low-pressure proportional back pressure valve 301 and the overflow valve 2 33, respectively. High-pressure ball valve 21 is installed in the oil circuit between the valve blocks 28. The oil circuit of the annular valve block 28 is also connected to the oil tank 1 through high-pressure ball valve 32. A pressure test connector 25 is installed in the oil circuit inside the annular valve block 28. This oil circuit is connected to multiple accumulators 26 through high-pressure ball valve 12 to absorb oil pulsation, reduce pressure fluctuations, and reduce the impact of pressure fluctuations on the system. Explosion-proof pressure sensor 20 and pressure gauge 21 are installed in the oil inlet of oil circuit block 12 and the oil circuit of the annular valve block 28. The high and low pressures are precisely controlled by the high-pressure proportional back pressure valve 302 and the low-pressure proportional back pressure valve 301 to ensure pressure safety. The overflow valve 23 acts as a safety valve to ensure the safety of the oil circuit pressure and prevent overpressure. The oil tank 1 is also equipped with a return oil pump group, which is connected to oil circuit block 2 39. The return oil pump group is connected to the one-way valve 3 40 located on oil circuit block 2 39, and then connected to filter 1 43 and filter 2 44 in sequence. Then, it is connected to the customer's main oil tank 1 through high pressure oil pipe 1 22. The oil line at the rear end of the one-way valve 3 40 is also equipped with overflow valve 3 41 and pressure gauge 2 42. In the nozzle test, the oil tank 1 of this device is relatively small. When the nozzle spray volume is large, the oil can be sucked out and filtered, and then discharged back to other larger oil tanks 1 at the test site to prevent the oil tank 1 from overflowing. The pressure pump unit includes an internal gear pump 7. The rear end of the internal gear pump 7 is connected to an explosion-proof servo motor 6 via a coupling 8. A bell-shaped cover is provided on the outside. The oil suction port of the internal gear pump 7 is equipped with an oil suction filter 9. The explosion-proof servo motor 6 and the explosion-proof pressure sensor 20 form a closed-loop control, which can adjust the output pressure and flow rate to provide pressure for the back pressure chamber. The return oil pump unit includes an explosion-proof motor 36, which is connected to an oil pump 37 via a coupling 38. The oil pump 37 has an oil suction filter 35 installed at its suction port.

[0021] In use, the device is pushed to the test site using the caster 10. The test nozzles are installed, and after adding the test fuel, the return oil pipe is connected to the fuel tank 1 on site. The device can then be started, pumping out oil. The oil is then sent to the annular mounting valve block 28 after passing through the electro-proportional pressure reducing valve 18 and the one-way valve 19. Alternatively, the oil can be directly input into the annular mounting valve block 28 by opening and closing the two ball valves 15, bypassing the electro-proportional pressure reducing valve 18 and the one-way valve 19. The high-pressure proportional back pressure valve 302 and the low-pressure proportional back pressure valve 301 can be used to maintain constant pressure, ensuring that both high and low pressures can be maintained stably. The overflow valve 2 33 and the high-pressure ball valve 2 31 provide a step-by-step safety guarantee. Even if the components fail, the pressure can be manually released to ensure system safety to the greatest extent.

[0022] The installation, connection, or setting methods of the components not detailed above are all common mechanical methods, and the specific structure, model, and coefficient indicators of all their components are their own technologies. As long as they can achieve their beneficial effects, they can be implemented, so they will not be elaborated further.

[0023] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A fuel injector testing and back pressure regulation system, comprising a fuel tank (1), characterized in that: The bottom of the oil tank (1) is equipped with casters (10). A pressure pump assembly is installed on the oil tank (1). The oil outlet pipe of the pressure pump assembly is connected to the oil circuit block (12) through a check valve (11) and a high-pressure oil pipe (23). The oil circuit block (12) is equipped with an inlet oil circuit and a return oil circuit. An overflow valve (13) is installed on the oil circuit block (12). The inlet oil circuit is directly connected to the return oil circuit through a throttle valve (14). The return oil circuit is connected to the oil tank (1) through a high-pressure oil pipe (24). The inlet oil circuit is divided into two outputs. One output is connected to the high-pressure filter (17) installed on it, and the other is directly connected to the outlet; the outlet of the high-pressure filter (17) is connected to ball valve two (16), and the rear end of ball valve two (16) is connected to two ball valve one (15) through high-pressure oil pipe four (34). The rear end of one of the ball valve one (15) is connected to an electric proportional pressure reducing valve (18), and the outlet of the electric proportional pressure reducing valve (18) is connected to a one-way valve two (19). The rear end of the other ball valve one (15) is directly connected to At the rear end of check valve 2 (19), ball valve 3 (45) is connected, and an annular mounting valve block (28) for connecting the test ring is connected. Ball valve 2 (16) is also connected to the outlet of the oil inlet in oil circuit block 1 (12), and its rear end is connected to explosion-proof logic valve (29) through a high-pressure oil pipe. The high-pressure oil pipe is connected to the control end of explosion-proof logic valve (29), and the B port of explosion-proof logic valve (29) is connected to the annular mounting valve block. (28) Port A is connected to the oil tank (1) via a high-pressure proportional back pressure valve (302); the oil circuit of the annular mounting valve block (28) is also connected to the oil tank (1) via a low-pressure proportional back pressure valve (301) and a relief valve (33), respectively. A high-pressure ball valve (31) is provided on the oil circuit between the relief valve (33), the explosion-proof logic valve (29) and the annular mounting valve block (28). The oil circuit of the annular mounting valve block (28) is also connected to the oil tank (1) via a high-pressure ball valve (32).

2. The fuel injector testing and back pressure adjustment system according to claim 1, characterized in that: In the oil circuit inside the annular mounting valve block (28), multiple accumulators (26) are connected through a high-pressure ball valve (27).

3. The fuel injector testing and back pressure adjustment system according to claim 1, characterized in that: The oil tank (1) is also equipped with a return oil pump group, which is connected to the oil circuit block two (39). The return oil pump group is connected to the one-way valve three (40) located on the oil circuit block two (39), and then connected to the filter one (43) and the filter two (44) in sequence. Then, it is connected to the main oil tank (1) through the high pressure oil pipe one (22). The oil circuit at the rear end of the one-way valve three (40) is also equipped with the overflow valve three (41) and the pressure gauge two (42).

4. The fuel injector testing and back pressure adjustment system according to claim 1, characterized in that: An explosion-proof pressure sensor (20) and a pressure gauge (21) are provided on the oil inlet line of the oil circuit block (12) and the oil line of the annular mounting valve block (28).

5. The fuel injector testing and back pressure adjustment system according to claim 1, characterized in that: The pressure pump assembly includes an internal gear pump (7), the rear end of which is connected to an explosion-proof servo motor (6) via a coupling (8), and a bell-shaped cover is provided on the outside. The oil suction port of the internal gear pump (7) is provided with an oil suction filter (9).

6. The fuel injector testing and back pressure adjustment system according to claim 3, characterized in that: The return oil pump assembly includes an explosion-proof motor (36), which is connected to an oil pump (37) via a coupling (38). The oil pump (37) is equipped with an oil suction filter (35) at its suction port.

7. The fuel injector testing and back pressure adjustment system according to claim 1, characterized in that: The oil tank (1) is equipped with an oil filling port (2), an oil level gauge (3), an explosion-proof liquid level and temperature sensor (4), and an explosion-proof junction box (5) for installing the control unit.

8. The fuel injector testing and back pressure adjustment system according to claim 1, characterized in that: The annular mounting valve block (28) is provided with a pressure testing connector (25) connected to its internal oil circuit.

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