Marine fuel injection valve nozzle flow test system

Abstract

The invention relates to a flow testing system for a nozzle of a marine fuel injection valve. Comprising an oil tank, a coarse filter, a frequency converter, an oil pump, a motor, a fine filter, an energy accumulator, an overflow valve, a first pressure regulating valve, a second temperature sensor, a differential pressure sensor, a second regulating valve, a third temperature sensor, a first three-way change-over valve, a mass flow meter, a second three-way change-over valve and a weighing device. The system controls a second regulating valve, a first three-way change-over valve and a second three-way change-over valve, so that system oil directly passes through a mass flow meter and reaches a weighing device without passing through a measured nozzle, the mass flow meter is calibrated through weighing, and then the system oil is discharged into an oil tank; by controlling the first three-way change-over valve and the second three-way change-over valve, the system oil passes through the mass flow meter to be subjected to flow testing after passing through the tested nozzle, and directly enters the oil tank after passing through the mass flow meter. The flow performance of the marine fuel injection valve nozzle can be detected, and whether the nozzle meets the design requirement or not is judged.

Description

Technical Field

[0001] The invention relates to a marine diesel engine fuel injection system, in particular to a marine fuel injection valve nozzle flow rate testing system. Background Art

[0002] The fuel injection valve is the core component of the diesel engine fuel injection system. Its function is to spray fuel into the cylinder so that the fuel and the air in the cylinder are fully mixed to achieve a better combustion effect. As the key core component of the fuel injection valve, the performance of the nozzle directly affects the use effect of the injection valve.

[0003] The flow characteristics of the nozzle affect the fuel injection amount of the injection valve, which may eventually affect the performance of the diesel engine, especially the nozzle of the large-flow fuel injection valve. Therefore, it is necessary to test the flow of the large-flow fuel injection valve nozzle. Summary of the invention

[0004] The purpose of the present invention is to provide a marine fuel injection valve nozzle flow testing system, which can detect the flow performance of the marine fuel injection valve nozzle and determine whether the nozzle meets the design requirements.

[0005] A marine fuel injection valve nozzle flow rate testing system according to the present invention comprises: an oil tank for storing system oil; The coarse filter is connected after the oil tank and is used to filter impurities in the system oil; An oil pump, driven by an electric motor, is used to pressurize the system oil; A frequency converter, connected to the motor, for adjusting the speed of the motor; The motor is connected with the frequency converter and the oil pump to provide power; Fine filter, connected after the oil pump, is used to filter impurities in the system oil; The accumulator is connected to the output end of the fine filter and is used to stabilize the system pressure; The overflow valve is connected after the accumulator to control the maximum pressure of the system and prevent overpressure; A first pressure regulating valve, whose input end is connected to the output end of the relief valve, and whose output end is connected to the oil tank, is used to adjust the system to a required pressure; The nozzle to be tested is connected to the pipeline after the system pressure is adjusted; The second regulating valve is used to adjust the system oil to flow to the nozzle under test or bypass the nozzle under test; A first three-way conversion valve and a second three-way conversion valve, wherein one of the input ports of the first three-way conversion valve is connected to the output pipeline of the second regulating valve, the other input port of the first three-way conversion valve is connected to the pipeline at the rear end of the nozzle to be tested, and the input port of the second three-way conversion valve is connected to the output pipeline of the first three-way conversion valve, for controlling the switching of the oil circuit; A mass flow meter is provided on the pipeline connecting the first three-way conversion valve and the second three-way conversion valve, and is used to measure the mass flow of the system oil; A weighing device is connected to an output port of the second three-way conversion valve, and is used to collect and measure the weight of the system oil after passing through the mass flow meter; the other output port of the second three-way conversion valve is connected to the oil tank; The system controls the second regulating valve, the first three-way conversion valve and the second three-way conversion valve to enable the system oil to directly pass through the mass flow meter without passing through the nozzle to be tested, reach the weighing device, calibrate the mass flow meter by weighing, and after completion, the system oil is discharged to the oil tank; and controls the first three-way conversion valve and the second three-way conversion valve to enable the system oil to pass through the nozzle to be tested, pass through the mass flow meter for flow test, and directly enter the oil tank after passing through the mass flow meter.

[0006] Optionally, it further includes a first temperature sensor and a temperature control device; the first temperature sensor is used to detect the temperature of the oil in the oil tank; the temperature control device controls the temperature of the oil in the oil tank to be within a preset temperature range based on the temperature detected by the first temperature sensor. The first temperature sensor can monitor the temperature of the oil in the oil tank in real time, and the temperature control device can control the temperature to be within a preset range based on the data of the first temperature sensor, thereby ensuring the accuracy and stability of the test.

[0007] Optionally, a liquid level controller is also included to monitor and control the height of the oil in the oil tank. The liquid level controller can monitor and control the height of the oil in the oil tank, avoiding the influence of too much or too little oil on the test, and improving the reliability and safety of the test.

[0008] Optionally, a second temperature sensor is provided at the front end of the nozzle under test, and a third temperature sensor is provided at the rear end of the nozzle under test, for real-time monitoring of the temperature conditions before and after the nozzle under test. The second temperature sensor and the third temperature sensor can monitor the temperature conditions before and after the nozzle under test in real time, which is helpful for analyzing the performance of the nozzle.

[0009] Optionally, a differential pressure sensor is provided on the pipeline connecting the front end of the nozzle to be tested and the output port of the first three-way conversion valve, for monitoring the differential pressure of the system oil before and after passing through the nozzle to be tested. The introduction of the differential pressure sensor can monitor the differential pressure of the system oil before and after passing through the nozzle to be tested, providing important data for the flow characteristic analysis of the nozzle.

[0010] Optionally, another output port of the second three-way conversion valve is connected to the oil tank through a pipeline, and through the control of the first three-way conversion valve and the second three-way conversion valve, the system oil can be tested by a mass flow meter after passing the nozzle under test, and directly enter the oil tank after passing the flow test. Another output port of the second three-way conversion valve is connected to the oil tank through a pipeline, and the tested oil can be discharged back to the oil tank.

[0011] Optionally, the oil pump and the motor are composed of multiple groups connected in parallel, and one or more groups of the oil pumps and motors are used to work according to the pressure or flow requirements of the test. The oil pump and the motor are composed of multiple groups connected in parallel, and one or more groups of the oil pumps and motors can be selected to work according to the pressure or flow requirements of the test, thereby improving the flexibility and adaptability of the system. For example, one group of oil pumps and motors is used to work when low flow requirements are required, and multiple groups of oil pumps and motors are used to work when high flow requirements are required.

[0012] Beneficial effects of the present invention: (1) Precise control of pressure and temperature: The system can pressurize the liquid test medium from low pressure to the required set pressure value through program control, and the pressure is adjustable. This flexibility ensures that the test can simulate various actual working conditions and improves the accuracy and practicality of the test. At the same time, the system pressure can be stabilized to ±3%, which greatly reduces the test error caused by pressure fluctuations and improves the accuracy of the test. The temperature of the liquid test medium of the system is controlled within the required range by the temperature control device, ensuring the stability and reliability of the test results. Temperature has a significant impact on the nozzle flow performance, so temperature control is the key to test accuracy.

[0013] (2) Accurate test of flow performance: The system can test the time for a certain mass of system oil to pass through the nozzle, or test the quality of system oil passing through the nozzle within a certain period of time. This test method can fully reflect the flow performance of the nozzle, including flow size, flow stability and flow uniformity. Through program control, the system can accurately record test data, reduce human errors, and improve the accuracy and reliability of the test.

[0014] (3) Accurate calibration of mass flow meter: The system can calibrate the mass flow meter using a weighing device through program control. This calibration method can ensure the accuracy of the mass flow meter, thereby improving the accuracy and reliability of the entire test system. The calibration process is simple and fast, which reduces maintenance costs and improves test efficiency.

[0015] (4) Improve the qualification of the nozzle: By accurately testing the flow performance of the nozzle, the system can guarantee the qualification of the nozzle to a great extent. This helps to ensure the stable and reliable performance of the injection valve and even the diesel engine during use, and reduces equipment downtime and maintenance costs caused by nozzle failure.

[0016] (5) Guaranteeing equipment performance: The test system of the present invention provides a strong guarantee for the performance of the injection valve and the diesel engine. Through accurate testing, problems with the nozzle can be discovered in time and repaired or replaced, thus avoiding equipment damage or performance degradation caused by nozzle failure.

[0017] (6) Improve test efficiency and automation level: The system realizes automated testing through program control, which reduces manual intervention and improves test efficiency and accuracy. At the same time, the system's automation level also improves the repeatability and comparability of the test, making the test results more reliable.

[0018] In summary, the marine fuel injection valve nozzle flow rate test system of the present invention has the technical effects of accurate pressure and temperature control, accurate flow performance test, accurate calibration of mass flow meter, improving nozzle qualification, ensuring equipment performance, and improving test efficiency and automation level. These effects jointly improve the accuracy and reliability of the test system and provide strong support for the performance evaluation of injection valves and diesel engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of a marine fuel injection valve nozzle flow rate testing system in an embodiment of the present application; Wherein: 1. oil tank 1, 2. first temperature sensor, 3. temperature control device, 4. liquid level controller, 5. coarse filter, 6. frequency converter, 7. oil pump, 8. motor, 9. fine filter, 21. accumulator, 10. overflow valve, 11. first pressure regulating valve, 12. first temperature sensor, 13. differential pressure sensor, 14. second regulating valve, 15. fixture, 16. second temperature sensor, 17. first three-way conversion valve, 18. mass flow meter, 19. second three-way conversion valve, 20. weighing device. DETAILED DESCRIPTION

[0020] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0021] like Figure 1As shown, in the embodiment of the present application, a marine fuel injection valve nozzle flow test system includes a fuel tank 1, a coarse filter 5, a frequency converter 6, an oil pump 7, a motor 8, a fine filter 9, an accumulator 21, a relief valve 10, a first pressure regulating valve 11, a second temperature sensor 12, a pressure difference sensor 13, a second regulating valve 14, a third temperature sensor 16, a first three-way conversion valve 17, a mass flow meter 18, a second three-way conversion valve 19 and a weighing device 20. Among them: the fuel tank 1 is used to store system oil. The coarse filter 5 is connected to the back of the fuel tank 1 and is used to coarsely filter impurities in the system oil. The oil pump 7 is driven by the motor 8 and is used to pressurize the system oil. The frequency converter 6 is connected to the motor 8 and is used to adjust the speed of the motor 8. The motor 8 is connected to the frequency converter 6 and the oil pump 7 to provide power. The fine filter 9 is connected to the back of the oil pump 7 and is used to finely filter impurities in the system oil. The accumulator 21 is connected to the output end of the fine filter 9 to stabilize the system pressure. The overflow valve 10 is connected to the back of the accumulator 21, and is used to control the maximum pressure of the system and prevent overpressure. The input end of the first pressure regulating valve 11 is connected to the output end of the overflow valve 10, and the output end of the first pressure regulating valve 11 is connected to the oil tank 1, and is used to adjust the system to the required pressure. The nozzle to be tested is connected to the pipeline after the system pressure is adjusted. The second regulating valve 14 is used to adjust the system oil to flow to the nozzle to be tested or bypass the nozzle to be tested. The first three-way conversion valve 17 and the second three-way conversion valve 19, one of the input ports of the first three-way conversion valve 17 is connected to the output pipeline of the second regulating valve 14, the other input port of the first three-way conversion valve 17 is connected to the pipeline at the rear end of the nozzle to be tested, and the input port of the second three-way conversion valve 19 is connected to the output pipeline of the first three-way conversion valve 17, which is used to control the switching of the oil circuit. The mass flowmeter 18 is arranged on the pipeline connecting the first three-way conversion valve 17 and the second three-way conversion valve 19, and is used to measure the mass flow of the system oil. The weighing device 20 is connected to an output port of the second three-way conversion valve 19 for collecting and measuring the weight of the system oil after passing through the mass flow meter 18 ; the other output port of the second three-way conversion valve 19 is connected to the oil tank 1 .

[0022] The system oil is filtered by the coarse filter 5 and then enters the oil pump 7. The frequency converter 6 drives the motor 8 to rotate, and the motor 8 drives the oil pump 7 to operate to pressurize the system oil. The pressurized system oil is filtered by the fine filter 9, and then passes through the accumulator 21 and the relief valve 10 to ensure that the system pressure is maintained stable within the set pressure fluctuation range. The system pressure is adjusted to the required pressure through the first pressure regulating valve 11.

[0023] The system controls the second regulating valve 14, the first three-way conversion valve 17 and the second three-way conversion valve 19 to ensure that the system oil passes through the mass flow meter 18 directly to the weighing device 20 without passing through the nozzle to be tested. The mass flow meter 18 is calibrated by weighing. After completion, the system oil is discharged to the oil tank 1.

[0024] The system controls the first three-way conversion valve 17 and the second three-way conversion valve 19 to achieve flow testing of the system oil through the mass flow meter 18 after passing through the nozzle to be tested, and directly enters the oil tank 1 after passing through the mass flow meter 18.

[0025] like Figure 1 As shown, in a possible embodiment, a marine fuel injection valve nozzle flow rate test system further includes a first temperature sensor 2 and a temperature control device 3; the first temperature sensor 2 is used to detect the temperature of the oil in the oil tank 1; the temperature control device 3 controls the temperature of the oil in the oil tank 1 to be within a preset temperature range based on the temperature detected by the first temperature sensor 2. The first temperature sensor 2 can monitor the temperature of the oil in the oil tank in real time, and the temperature control device 3 can control the temperature to be within a preset range based on the data of the first temperature sensor 2, thereby ensuring the accuracy and stability of the test.

[0026] The temperature control device 3 mainly measures the temperature of the oil in the oil tank 1 through the first temperature sensor 2, and controls the heating or cooling device according to the set temperature range. When the temperature of the oil in the oil tank 1 exceeds the set temperature range, the temperature control device 3 automatically controls the heating or cooling device to adjust the temperature of the oil in the oil tank. In this way, the temperature of the oil in the oil tank can always be kept within a stable range.

[0027] like Figure 1 As shown, in a possible embodiment, a marine fuel injection valve nozzle flow rate test system further includes a liquid level controller 4 for monitoring and controlling the height of the oil in the oil tank 1. The liquid level controller 4 can monitor and control the height of the oil in the oil tank 1, avoiding the influence of too much or too little oil on the test, and improving the reliability and safety of the test.

[0028] like Figure 1 As shown, in a possible embodiment, a marine fuel injection valve nozzle flow test system further includes a second temperature sensor 12 disposed at the front end of the nozzle under test, and a third temperature sensor 16 disposed at the rear end of the nozzle under test, for real-time monitoring of the temperature conditions before and after the nozzle under test. The second temperature sensor 12 and the third temperature sensor 16 can monitor the temperature conditions before and after the nozzle under test in real time, which is helpful for analyzing the performance of the nozzle.

[0029] like Figure 1 As shown, in a possible embodiment, a differential pressure sensor 13 is provided on the pipeline between the front end of the nozzle to be tested and the output port of the first three-way conversion valve 17, for monitoring the differential pressure of the system oil before and after passing through the nozzle to be tested. The introduction of the differential pressure sensor 13 can monitor the differential pressure of the system oil before and after passing through the nozzle to be tested, providing important data for the flow characteristic analysis of the nozzle.

[0030] like Figure 1As shown, in a possible embodiment, the other output port of the second three-way conversion valve 19 is connected to the oil tank 1 through a pipeline, and through the control of the first three-way conversion valve 17 and the second three-way conversion valve 19, the system oil can pass through the nozzle under test and then pass the flow test through the mass flow meter 18, and directly enter the oil tank 1 after passing the flow test. The other output port of the second three-way conversion valve 19 is connected to the oil tank 1 through a pipeline, and the tested oil can be discharged back to the oil tank 1.

[0031] like Figure 1 As shown, in a possible embodiment, the oil pump 7 and the motor 8 are composed of multiple groups in parallel, and one or more groups of the oil pump 7 and the motor 8 are used to work according to the pressure or flow requirements of the test. The oil pump 7 and the motor 8 are composed of multiple groups in parallel, and one or more groups of the oil pump 7 and the motor 8 can be selected to work according to the pressure or flow requirements of the test, thereby improving the flexibility and adaptability of the system. For example, when the flow demand is low, one group of the oil pump 7 and the motor 8 is used to work, and when the flow demand is high, multiple groups of the oil pump 7 and the motor 8 are used to work together. In the embodiment of the present application, the working process of the marine fuel injection valve nozzle flow rate testing system is as follows: Step 1: Control the fixture 15 to clamp the nozzle to be tested and ensure sealing.

[0032] Step 2: Start the oil pump 7, set the system pressure, flow and other information, input the tester and calibration nozzle number, and wait for the system to reach the set pressure, temperature and other requirements.

[0033] Step 3: Start the test, observe whether the difference between the result of the mass flow meter 18 and the result of the weighing device 20 is within the required range, and generate a test report. The calibration test is repeated after each batch of nozzles is tested or after 2 hours of testing.

[0034] Step 4: Loosen the fixture 15, remove the calibration nozzle, and then install the nozzle to be tested.

[0035] Step 5: Input the number of the nozzle to be tested, and clamp the nozzle to be tested by the fixture 15, click the "flow test" option in the test software, observe whether the test results meet the requirements, and generate a test report at the same time.

[0036] Step 6: Replace the next nozzle to be tested and repeat steps 4 and 5.

[0037] The marine fuel injection valve nozzle flow test system is equipped with multiple safety measures, such as automatic pressure relief or even shutdown in case of overpressure, so there is no danger of overpressure.

[0038] The above-mentioned embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above-mentioned embodiments. Any other changes, modifications, substitutions, combinations and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A marine fuel injection valve nozzle flow test system, characterized in that: include: An oil tank (1) for storing system oil; A coarse filter (5) connected to the oil tank (1) and used to filter impurities in the system oil; An oil pump (7), driven by a motor (8), for pressurizing the system oil; A frequency converter (6) connected to the motor (8) and used to adjust the speed of the motor (8); A motor (8) connected to the frequency converter (6) and the oil pump (7) for providing power; A fine filter (9), connected after the oil pump (7), for filtering impurities in the system oil; An accumulator (21) is connected to the output end of the fine filter (9) and is used to stabilize the system pressure; A relief valve (10) connected after the accumulator (21) is used to control the maximum pressure of the system and prevent overpressure; A first pressure regulating valve (11), the input end of which is connected to the output end of the overflow valve (10), and the output end of the first pressure regulating valve (11) is connected to the oil tank (1) for adjusting the system to a required pressure; The nozzle to be tested is connected to the pipeline after the system pressure is adjusted; A second regulating valve (14) is used to regulate the system oil to flow toward the nozzle under test or to bypass the nozzle under test; a first three-way conversion valve (17) and a second three-way conversion valve (19), wherein one input port of the first three-way conversion valve (17) is connected to the output pipeline of the second regulating valve (14), the other input port of the first three-way conversion valve (17) is connected to the pipeline at the rear end of the nozzle to be tested, and the input port of the second three-way conversion valve (19) is connected to the output pipeline of the first three-way conversion valve (17), for controlling the switching of the oil circuit; A mass flow meter (18) is arranged on a pipeline connecting the first three-way conversion valve (17) and the second three-way conversion valve (19) and is used to measure the mass flow of system oil; A weighing device (20) is connected to an output port of the second three-way conversion valve (19) and is used to collect and measure the weight of the system oil after passing through the mass flow meter (18); the other output port of the second three-way conversion valve (19) is connected to the oil tank (1); The system controls the second regulating valve (14), the first three-way conversion valve (17) and the second three-way conversion valve (19) so that the system oil does not pass through the nozzle to be tested but directly passes through the mass flow meter (18) to reach the weighing device (20), and the mass flow meter (18) is calibrated by weighing. After completion, the system oil is discharged into the oil tank (1); and the system oil passes through the nozzle to be tested and then passes through the mass flow meter (18) for flow test by controlling the three-way conversion valve (17) and the three-way conversion valve (19), and then directly enters the oil tank (1) after passing through the mass flow meter (18).

2. The marine fuel injection valve nozzle flow rate test system according to claim 1, characterized in that: It also comprises a first temperature sensor (2) and a temperature control device (3); the first temperature sensor (2) is used to detect the temperature of the oil in the oil tank (1); the temperature control device (3) controls the temperature of the oil in the oil tank (1) to remain within a preset temperature range based on the temperature detected by the first temperature sensor (2).

3. The marine fuel injection valve nozzle flow rate test system according to claim 1, characterized in that: It also includes a liquid level controller (4) for monitoring and controlling the height of the oil in the oil tank (1).

4. The marine fuel injection valve nozzle flow rate test system according to claim 1, characterized in that: It also includes a second temperature sensor (12) arranged at the front end of the nozzle being tested, and a third temperature sensor (16) arranged at the rear end of the nozzle being tested, for real-time monitoring of the temperature conditions before and after the nozzle being tested.

5. The marine fuel injection valve nozzle flow rate testing system according to claim 1 or 2, characterized in that: A pressure difference sensor (13) is provided on the pipeline connecting the front end of the nozzle to be tested and the output port of the first three-way conversion valve (17) for monitoring the pressure difference of the system oil before and after passing through the nozzle to be tested.

6. The marine fuel injection valve nozzle flow rate test system according to claim 1, characterized in that: The other output port of the second three-way conversion valve (19) is connected to the oil tank (1) through a pipeline. Through the control of the first three-way conversion valve (17) and the second three-way conversion valve (19), the system oil can pass through the nozzle to be tested and then pass through the mass flow meter (18) to perform a flow test, and directly enter the oil tank (1) after passing the flow test.

7. The marine fuel injection valve nozzle flow rate test system according to claim 1, characterized in that: The oil pump (7) and the motor (8) are formed in the form of multiple sets connected in parallel, and one or more sets of the oil pump and motor are used to work according to the pressure or flow requirements of the test.

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