Testing device for VCU (vent valve control unit) of marine diesel engine

Abstract

The utility model relates to the field of marine diesel engine exhaust valve control unit (VCU) test equipment, in particular to a marine diesel engine exhaust valve control unit (VCU) test device. An exhaust valve control unit (VCU) of a marine diesel engine is a driving part for guaranteeing that an exhaust valve is opened according to exhaust timing, if hydraulic pressure output by the VCU cannot drive the exhaust valve to be normally opened, exhaust gas of an air cylinder cannot be exhausted, and therefore safety accidents such as piston ring breakage and exhaust valve rod breakage are caused. Therefore, according to the testing device provided by the utility model, the exhaust valve is simulated through the hydraulic piston cylinder to test whether the VCU can drive the piston cylinder to act normally after the electromagnetic valve acts, so that the function of the VCU is verified. For a VCU adopting an independent oil inlet design, the testing device provides an independent hydraulic oil tank, and hydraulic oil is conveyed to a piston cavity of the VCU by utilizing gravity; through the bases with different sizes on the panel, the function test of VCUs of all models can be completed on the test bench provided by the utility model. The testing device of the marine diesel engine exhaust valve control unit (VCU) comprises an oil tank, a thermometer, a temperature sensor, a heater, a gear pump, a variable frequency motor, a test board frame, a hydraulic piston cylinder, a control system, a pressure testing tool and a high-pressure hose, the oil tank is arranged in the test board frame, the thermometer is installed on one side of the oil tank, the temperature sensor is installed in the oil tank, and the temperature sensor is installed on the other side of the oil tank. One side of the oil tank is provided with a gear pump and a variable-frequency motor, the output end of the variable-frequency motor is fixedly connected with the gear pump, and the input end of the gear pump is communicated with the oil tank through a pipeline. According to the marine diesel engine VCU testing device provided by the utility model, the assembly quality of the VCU is tested through static test and functional test, the test bench can meet the test work of different models of VCUs, the reliability and the service life of the VCU are guaranteed to a great extent, and the risk hidden danger of ship operation is eliminated.

Description

Technical Field

[0001] The utility model relates to the field of VCU testing equipment for marine diesel engine exhaust valve control units, in particular to a VCU testing device for marine diesel engines. Background Art

[0002] If problems arise during the manufacturing and assembly of the exhaust valve control unit (VCU), the VCU's drive oil pressure may not be established, causing the VCU to fail and the drive oil to be unable to properly open the exhaust valve. This can cause the temperature and pressure inside the diesel engine cylinder to continue to rise, damaging cylinder components such as the cylinder liner, piston, and exhaust valve. Common causes of VCU failure include: failure of the spring within the VCU piston cylinder, internal oil leakage within the VCU resulting in an inability to establish oil pressure, and failure of the VCU common rail valve resulting in the piston not being able to operate normally. Therefore, it is necessary to provide a new test device and method for the marine diesel engine VCU to address these technical issues. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a testing device and a testing method for a VCU of a marine diesel engine.

[0004] The utility model provides a test device for a marine diesel engine VCU, comprising a fuel tank, a thermometer, an air filter, a temperature sensor, a heater rod, a thermostat, a check valve, a pump-valve assembly, a pressure oil filter, a pressure gauge, a butterfly valve, a pressure sensor, a control system, a VCU oil inlet hose, a high-pressure connection block, a hydraulic piston cylinder, a test bench frame, a fuel tank cleaning port, a VCU mounting bracket, a hydraulic piston cylinder oil inlet hose, a hydraulic piston cylinder oil return hose, a VCU oil return hose, a VCU static test fixture, an independent drive oil tank, and a drive oil inlet hose. The test bench frame houses the fuel tank, with a thermometer, an air filter, a temperature sensor, and a heater rod mounted on one side of the tank. The pump-valve assembly, consisting of a gear pump, a coupling, and a variable frequency motor, is mounted on one side of the fuel tank. The output of the variable frequency motor is fixedly connected to the gear pump, and the input of the gear pump is connected to the fuel tank via a pipeline. The control system is fixedly mounted on one side of the top of the test bench frame. The hydraulic piston cylinder and mounting brackets for various VCU models are mounted flat on the test bench frame.

[0005] Preferably, a reinforcing plate is symmetrically fixedly connected to the bottom of the control system, and one side of the reinforcing plate is fixedly connected to the test bench frame.

[0006] Preferably, a fine filter is installed on the pipeline communicating between the oil tank and the gear pump.

[0007] Preferably, a pressure control valve is installed outside the gear pump.

[0008] Preferably, the output end of the gear pump is connected to a pipeline, and a one-way valve and a butterfly valve are installed in sequence on the pipeline at the output end of the gear pump.

[0009] Preferably, a pressure gauge and a pressure sensor are installed on the channel at the output end of the gear pump between the one-way valve and the butterfly valve.

[0010] Preferably, a cleaning port is provided on one side of the test bench frame, and the cleaning port is arranged facing the oil tank.

[0011] Preferably, a VCU fixing bracket is installed on the plane of the test bench frame, and the types of the fixing bracket can cover all existing VCU models, and all brackets are integrated on the plane of the test bench frame.

[0012] Preferably, for VCU models that require independent supply of driving oil, an independent driving oil tank is provided, which is located at a height of more than 2 meters above the test bench and uses gravity to supply the driving oil to the driving oil chamber of the VCU through the driving oil inlet hose;

[0013] The utility model also provides a static test method and a functional test method of a marine diesel engine VCU, wherein:

[0014] The static testing method includes the following steps:

[0015] 1) Install the VCU to be tested on the fixed bracket of the corresponding model on the test bench and tighten the VCU fixing bolts with a torque of 210Nm.

[0016] 2) Tighten the VCU oil inlet hose to the servo oil inlet hole at the bottom of the fixed bracket;

[0017] 3) Install the VCU test fixture on the VCU to be tested and tighten the fixing bolts of the top cover sealing plate with a torque of 40Nm;

[0018] 4) Open the butterfly valve, set the automatic stop pressure of the lubricating oil pump on the control panel of the control system, and then start the lubricating oil pump. According to the feedback from the pressure sensor, when the system pressure reaches the test pressure of the corresponding model (usually 480bar or 345bar), the control system will automatically stop the lubricating oil pump;

[0019] 5) After standing for 15 minutes, record the pressure shown on the pressure gauge to confirm whether there is any leakage in the VCU to be tested.

[0020] The functional testing method includes the following steps:

[0021] 1) Install the VCU to be tested on the fixed bracket of the corresponding model on the test bench and tighten the VCU fixing bolts with a torque of 210Nm.

[0022] 2) Tighten the VCU oil inlet hose to the servo oil inlet hole at the bottom of the fixed bracket;

[0023] 3) Connect the hydraulic piston cylinder oil inlet hose to the oil outlet hole on the VCU top cover;

[0024] 4) For VCU models with independent drive oil inlet, connect the drive oil inlet hose to the drive oil inlet port of the VCU; for VCUs with dependent oil inlet, this hose does not need to be connected;

[0025] 5) Open the butterfly valve, set the oil pump outlet pressure to 120 bar through the control system, start the lubricating oil pump, and adjust the VCU oil inlet pressure to 120 bar;

[0026] 6) Connect the common rail valve on the VCU to the control system;

[0027] 7) Monitor the lubricating oil temperature. The oil temperature for functional testing should be between 35℃ and 45℃. The functional test confirms whether the VCU can achieve the control function by observing whether the hydraulic piston cylinder performs reciprocating motion;

[0028] 8) When the hydraulic piston cylinder does not move, increase the oil pump outlet pressure to 200 bar through the control system. If the hydraulic piston cylinder still does not move normally, stop the functional test, disassemble and inspect the VCU, reinstall it and perform the functional test again according to the steps.

[0029] Compared with related technologies, the test device and test method for the marine diesel engine exhaust valve control unit VCU provided by the present invention have the following beneficial effects:

[0030] Static testing verifies VCU assembly quality, while functional testing verifies VCU functionality. This test bench can meet the testing requirements of different VCU models, greatly ensuring the reliability and service life of the VCU, eliminating potential risks in ship operation, and providing a multi-model platform for VCU testing. It can complete the inspection of VCU assembly quality and functionality, featuring a compact structure and high integration. Constant voltage control of the variable frequency motor ensures test stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a hydraulic principle diagram of the test device for the marine diesel engine VCU provided by the utility model;

[0032] Figure 2 This is a schematic diagram of the structure of the test device for the marine diesel engine VCU provided by the utility model;

[0033] Figure 3 A top view of the structural schematic diagram of the test device for the marine diesel engine VCU provided by the present invention;

[0034] Numbers in the figure: 1. Fuel tank; 2. Thermometer; 3. Air filter; 4. Temperature sensor; 5. Heating rod; 6. Thermostat; 7. Check valve; 8. Pump and valve assembly; 9. Pressure oil filter; 10. Pressure gauge; 11. Butterfly valve; 12. Pressure sensor; 13. Control system; 14. VCU oil inlet hose; 15. High-pressure hose; 16. Hydraulic piston cylinder; 17. Test bench frame; 18. Fuel tank cleaning port; 19. VCU fixing bracket; 20. Hydraulic piston cylinder oil inlet hose; 21. Hydraulic piston cylinder oil return hose; 22. VCU oil return hose; 23. VCU static test fixture; 24. Independent fuel tank for drive oil; 25. Drive oil inlet hose DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0037] See also Figures 1 to 3 A test device for a marine diesel engine exhaust valve control unit (VCU), comprising: a fuel tank (1), a thermometer (2), an air filter (3), a temperature sensor (4), a heating rod (5), a thermostat (6), a one-way valve (7), a pump valve assembly (8), a pressure oil filter (9), a pressure gauge (10), a butterfly valve (11), a pressure sensor (12), a control system (13), a VCU oil inlet hose (14), a high-pressure connection block (15), a hydraulic piston cylinder (16), a test bench frame (17), a fuel tank cleaning port (18), a VCU fixing bracket (19), a hydraulic piston cylinder oil inlet hose (20), a hydraulic piston cylinder oil return hose (21), a VCU oil return hose (22), a VCU static test fixture (23), a drive oil An independent oil tank (24), a driving oil inlet hose (25), an oil tank (1) is provided inside the test bench frame (17), a thermometer (2) is installed on one side of the oil tank (1), an air filter (3), a temperature sensor (4), and a heating rod (5) are installed inside the oil tank (1), a pump valve assembly (8) is installed on one side of the oil tank (1), the pump valve assembly consists of a gear pump (8.1), a coupling (8.2), and a variable frequency motor (8.3), the output end of the variable frequency motor (8.3) is fixedly connected to the gear pump (8.1), and the input end of the gear pump (8.1) is connected to the oil tank (1) through a pipeline, a control system (13) is fixedly installed on one side of the top of the test bench frame (17), and a hydraulic piston cylinder (16) and a fixing bracket (19) of various types of VCU are installed on the upper plane of the test bench frame (17).

[0038] It should be noted that various VCU mounting brackets 19 are distributed along the upper surface of the test bench frame 17. These brackets have ports for connecting to the VCU oil inlet pipe. In this test setup, the oil in the fuel tank 1 is pressurized to an adjustable 120 bar using the pump-valve assembly 8. The oil is then pumped to the port on the VCU mounting bracket 19 via the VCU oil inlet hose 14. The variable-frequency motor 8.3 controls the constant pressure of the gear pump 8.1, ensuring constant oil pressure entering the VCU during testing. The VCU oil return pipe returns to the fuel tank 1 via the oil return hose 22. When the VCU solenoid valve is energized, high-pressure drive oil, pressurized by the VCU, enters the hydraulic piston cylinder through hose 20, pushing the piston rod outward. When the VCU solenoid valve is de-energized, the VCU servo oil returns to the fuel tank through hose 22. The VCU drives the piston downward, reducing the oil pressure in the hydraulic piston cylinder 16. The hydraulic piston cylinder resets under the action of the spring force, and any oil leaking from the oil chamber returns to the fuel tank 1 through the oil return hose 21. The function of the VCU is verified by the reciprocating motion of the hydraulic piston cylinder.

[0039] See also Figure 1 、 Figure 2 , the control system 13 is fixed to one side of the test bench frame 17;

[0040] It should be noted that the control system 13 is located next to the test bench frame 17. The control box has start, stop, and emergency stop protection functions, as well as indication functions such as power supply, operation, stop, pressure gauge, and temperature gauge. The frequency converter is controlled by the control PLC to achieve constant pressure control. The reinforcement plate 18 is used to enhance the stability between the test bench frame 17 and the control system 13.

[0041] See also Figures 1 to 3 , the drive oil tank 24 is located outside the test bench and is connected to the VCU drive oil chamber through a filter;

[0042] It should be noted that the drive oil tank 24 is located more than 2 meters above the test bench and uses gravity to transport the drive oil to the drive oil chamber of the VCU. The filter 9 filters the drive oil before entering the VCU;

[0043] See also Figures 1 to 3 A fine filter 9 is installed on the pipeline between the oil tank 1 and the pump valve assembly 8.

[0044] It should be noted that: the fine filter 9 filters the lubricating oil entering the gear pump group;

[0045] See also Figures 1 to 3 A pressure control valve 8.4 is installed on the outside of the gear pump 8.1.

[0046] It should be noted that the pressure control valve 8.4 is used to control the lubricating oil output pressure;

[0047] See also Figures 1 to 3 The output end of the gear pump 8.1 is connected to a pipeline, and a one-way valve 7 and a butterfly valve 11 are installed in sequence on the pipeline at the output end of the gear pump 8.1.

[0048] It should be noted that the one-way valve 7 can prevent the lubricating oil from flowing back, and the butterfly valve 11 is used to manually close the lubricating oil supply.

[0049] See also Figures 1 to 3 A pressure gauge 10 and a pressure sensor 12 are installed on the channel at the output end of the gear pump 8.1 between the one-way valve 7 and the butterfly valve 11.

[0050] It should be noted that the pressure gauge 10 is used to display the lubricating oil pressure at the output end of the oil pump, and the pressure sensor 12 is used to collect the servo oil pressure entering the VCU and control the oil pump through the control system.

[0051] See also Figures 1 to 3 A cleaning port 18 is provided on one side of the test bench frame 17 , and the cleaning port 18 is arranged facing the oil tank 1 .

[0052] It should be noted that the cleaning port 18 facilitates cleaning of the fuel tank 1;

[0053] See also Figures 1 to 3 The present invention also provides a static testing method for a marine diesel engine VCU testing device, comprising the following steps:

[0054] 1) Install the VCU to be tested on the fixing bracket 19 of the corresponding model on the test bench, and tighten the VCU fixing bolts with a torque of 210Nm.

[0055] 2) Tighten the VCU oil inlet hose 14 to the servo oil inlet hole at the bottom of the fixed bracket 19;

[0056] 3) Install the VCU test fixture 23 on the VCU to be tested, and tighten the fixing bolts of the top cover sealing plate with a torque of 40 Nm;

[0057] 4) Open the butterfly valve 11, set the automatic stop pressure of the lubricating oil pump on the control panel of the control system 13, and then start the lubricating oil pump. According to the feedback from the pressure sensor 12, when the system pressure reaches the test pressure of the corresponding model (usually 480bar or 345bar), the control system 13 will automatically stop the lubricating oil pump;

[0058] 5) After standing for 15 minutes, record the pressure shown on the pressure gauge 10 to confirm whether there is any leakage in the VCU to be tested.

[0059] See also Figures 1 to 3 The present invention also provides a method for testing the function of a VCU test device for a marine diesel engine, comprising the following steps:

[0060] 1) Install the VCU to be tested on the fixing bracket 19 of the corresponding model on the test bench, and tighten the VCU fixing bolts with a torque of 210Nm.

[0061] 2) Tighten the VCU oil inlet hose 14 to the servo oil inlet hole at the bottom of the fixed bracket 19;

[0062] 3) Connect the hydraulic piston cylinder oil inlet hose 20 to the oil outlet hole on the VCU top cover;

[0063] 4) For VCU models with independent drive oil inlet, connect the drive oil inlet hose 23 to the drive oil inlet port of the VCU; for VCUs with dependent oil inlet, this pipe does not need to be connected;

[0064] 5) Open the butterfly valve 11, start the lubricating oil pump 8, set the outlet pressure of the oil pump to 120 bar through the control system 13, and adjust the VCU oil inlet pressure to 120 bar;

[0065] 6) Connect the common rail valve on the VCU to the control system 13;

[0066] 7) Monitor the lubricating oil temperature. The oil temperature for functional testing should be between 35℃ and 45℃. The functional test confirms whether the VCU can achieve the control function by observing whether the hydraulic piston cylinder 16 performs reciprocating motion;

[0067] 8) When the hydraulic piston cylinder 16 does not move, increase the oil pump outlet pressure to 200 bar through the control system 13. If the hydraulic piston cylinder 16 still does not move normally, stop the functional test, disassemble and inspect the VCU, reinstall it and perform the functional test again according to steps 1) to 7).

[0068] In summary, this test device provides a platform covering all models for testing the exhaust valve control unit (VCU). It can complete the inspection of the VCU assembly quality and functional implementation. It has the characteristics of compact structure and high integration. By controlling the constant voltage of the variable frequency motor, the stability and reliability of the test are guaranteed.

[0069] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A test device for a marine diesel engine exhaust valve control unit VCU, characterized in that: include: Fuel tank (1), thermometer (2), air filter (3), temperature sensor (4), heating rod (5), thermostat (6), one-way valve (7), pump valve assembly (8), pressure oil filter (9), pressure gauge (10), butterfly valve (11), pressure sensor (12), control system (13), VCU oil inlet hose (14), high-pressure connection block (15), hydraulic piston cylinder (16), test bench frame (17), fuel tank cleaning port (18), VCU fixing bracket (19), hydraulic piston cylinder oil inlet hose (20), hydraulic piston cylinder return oil hose (21), VCU return oil hose (22), VCU static test fixture (23), drive oil independent tank (24), drive oil inlet hose (25), the test bench An oil tank (1) is provided inside the frame (17), a thermometer (2) is installed on one side of the oil tank (1), an air filter (3), a temperature sensor (4), and a heating rod (5) are installed inside the oil tank (1), a pump valve assembly (8) is installed on one side of the oil tank (1), and the pump valve assembly consists of a gear pump (8.1), a coupling (8.2), and a variable frequency motor (8.3), the output end of the variable frequency motor (8.3) is fixedly connected to the gear pump (8.1), and the input end of the gear pump (8.1) is connected to the oil tank (1) through a pipeline, a control system (13) is fixedly installed on one side of the top of the test bench frame (17), and a hydraulic piston cylinder (16) and a VCU fixing bracket (19) are installed on the upper plane of the test bench frame (17).

2. The test device for the marine diesel engine exhaust valve control unit VCU according to claim 1, characterized in that: The bottom of the control system (13) is symmetrically and fixedly connected with a fuel tank cleaning port (18), and one side of the fuel tank cleaning port (18) is fixedly connected to the test bench frame (17).

3. The test device for the marine diesel engine exhaust valve control unit VCU according to claim 1, characterized in that: A pressure oil filter (9) is installed on the pipeline communicating between the oil tank (1) and the gear pump (8.1).

4. The test device for the marine diesel engine exhaust valve control unit VCU according to claim 1, characterized in that: A pressure control valve (8.4) is installed outside the gear pump (8.1).

5. The test device for the marine diesel engine exhaust valve control unit VCU according to claim 1, characterized in that: The output end of the gear pump (8.1) is connected to a pipeline, and a one-way valve (7) and a butterfly valve (11) are sequentially installed on the pipeline at the output end of the gear pump (8.1).

6. The test device for the marine diesel engine exhaust valve control unit VCU according to claim 5, characterized in that: A pressure gauge (10) and a pressure sensor (12) are installed on the channel at the output end of the gear pump (8.1) between the one-way valve (7) and the butterfly valve (11).

7. The test device for the marine diesel engine exhaust valve control unit VCU according to claim 1, characterized in that: A cleaning port (18) is provided on one side of the test bench frame (17), and the cleaning port (18) is arranged facing the oil tank (1).

8. The test device for the marine diesel engine exhaust valve control unit VCU according to claim 1, characterized in that: The test bench frame (17) is flatly mounted with a VCU fixing bracket (19), and the types of the fixing bracket (19) can cover all existing VCU models, and all brackets are integrated on the test bench frame (17).

9. The test device for the marine diesel engine exhaust valve control unit VCU according to claim 1, characterized in that: The independent driving oil tank (24) is located at a height of more than 2 meters on the test bench and supplies the driving oil to the driving oil chamber of the VCU through the driving oil inlet hose (25) by gravity.

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