Testing device and testing method for VCU of marine diesel engine exhaust valve control unit

Abstract

The invention discloses a testing device and a testing method for a VCU (vent valve control unit) of a marine diesel engine. 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 testboard frame, a hydraulic piston cylinder, a control system, a pressure testing tool and a high-pressure hose, the oil tank is arranged in the testboard 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 testing device and the testing method for the marine diesel engine VCU, the assembly quality of the VCU is tested through static testing and functional testing, the testing table can meet the testing work of different types 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 invention relates to the field of VCU testing equipment for marine diesel engine exhaust valve control units, and in particular to a testing device and a testing method for the VCU of a marine diesel engine. Background Art

[0002] If problems occur during the manufacturing and assembly of the exhaust valve control unit VCU, the VCU drive oil pressure will not be established, causing the VCU to fail, and the drive oil will not be able to open the exhaust valve normally. As a result, the temperature and pressure inside the diesel engine cylinder continue to rise, damaging cylinder components such as the cylinder liner, piston, and exhaust valve. Several common reasons that may cause VCU failure are as follows: failure of the spring inside the VCU piston cylinder, oil leakage inside the VCU resulting in the inability to establish oil pressure, and failure of the VCU common rail valve resulting in the piston failing to operate normally. Therefore, it is necessary to provide a new test device and test method for the VCU of a marine diesel engine to solve the above technical problems. Summary of the invention

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

[0004] The test device of the marine diesel engine VCU provided by the present invention comprises: an oil tank, a thermometer, an air filter, a temperature sensor, a heating rod, a thermostat, a one-way 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, an oil tank cleaning port, a VCU fixed bracket, a hydraulic piston cylinder oil inlet hose, a hydraulic piston cylinder oil return hose, a VCU oil return hose, a VCU static test tool, an independent oil tank for driving oil, and an oil inlet hose for driving oil. An oil tank is arranged inside the test bench frame, and a thermometer, an air filter, a temperature sensor, and a heating rod are installed on one side of the oil tank. A pump-valve assembly is installed on one side of the oil tank, and the pump-valve assembly consists of a gear pump, a coupling, and a motor. The output end of the variable frequency motor is fixedly connected to the gear pump, and the input end of the gear pump is connected to the oil tank through a pipeline. A control system is fixedly installed on one side of the top of the test bench frame. A hydraulic piston cylinder and fixed brackets of various types of VCU are installed on the plane of 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 on the outside of 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 present invention 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 of 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 the VCU to be tested has any leakage.

[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 of 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 non-independent oil inlet, this hose does not need to be connected;

[0025] 5) Open the butterfly valve, set the outlet pressure of the oil pump 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 200bar through the control system. If the hydraulic piston cylinder still does not move normally, stop the functional test, disassemble and inspect the VCU, and re-perform the functional test according to the steps after reinstalling.

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

[0030] The VCU assembly quality is tested through static testing, and the VCU function realization is tested through functional testing. The test bench can meet the testing work of VCU of different models, greatly guaranteeing the reliability and service life of VCU, eliminating the hidden risks of ship operation, and providing a multi-model coverage platform for VCU testing. It can complete the inspection of VCU assembly quality and function realization, and has the characteristics of compact structure and high integration. Through the constant voltage control of the variable frequency motor, the stability and reliability of the test are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A hydraulic principle diagram of a test device for a marine diesel engine VCU provided by the present invention;

[0032] Figure 2 A schematic diagram of the structure of a test device for a marine diesel engine VCU provided by the present invention;

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

[0034] Numbers in the figure: 1. Oil tank; 2. Thermometer; 3. Air filter; 4. Temperature sensor; 5. Heating rod; 6. Thermostat; 7. Check valve; 8. Pump 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. Oil 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. Drive oil independent tank; 25. Drive oil inlet hose DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 in conjunction with specific embodiments.

[0037] See also Figures 1 to 3 A test device for a marine diesel engine exhaust valve control unit (VCU), the test device for the marine diesel engine 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 check 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 An independent oil tank (24) and a driving oil inlet hose (25) are 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 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). A hydraulic piston cylinder (16) and a fixing bracket (19) of various types of VCU are installed on the plane of the test bench frame (17).

[0038] It should be noted that: various types of VCU fixing brackets 19 are distributed on the upper plane of the test bench frame 17, and there is an interface for connecting the VCU oil inlet pipe on the bracket. After the lubricating oil in the oil tank 1 is pressurized to 120 bar and adjustable through the pump valve assembly 8, it is transported to the interface of the VCU fixing bracket 19 through the VCU oil inlet hose 14. The constant pressure control of the gear pump 8.1 by the variable frequency motor 8.3 ensures that the lubricating oil pressure entering the VCU is constant during the test process, and the VCU return oil pipe returns to the oil tank 1 through the return oil hose 22. When the VCU solenoid valve is energized, the high-pressure driving oil pressurized by the VCU enters the hydraulic piston cylinder through the hose 20, pushing the piston cylinder top rod outward; when the VCU solenoid valve loses power, the servo oil of the VCU returns to the oil tank through the hose 22, the VCU drives the piston downward, the oil pressure of the hydraulic piston cylinder 16 decreases, the hydraulic piston cylinder resets under the action of the spring force, and the leaked oil in the oil chamber returns to the oil tank 1 through the return oil 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, emergency stop protection functions, power supply, operation, stop, pressure gauge, temperature gauge and other indication functions, the frequency converter is controlled by the control PLC to achieve constant pressure control, and 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 at a height of 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 that will enter 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 test method for a marine diesel engine VCU test device, comprising the following steps:

[0054] 1) Install the VCU to be tested on the fixing bracket 19 of the corresponding model of 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 of the pressure sensor 12, when the system pressure reaches the test pressure of the corresponding model (usually 480bar, 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 the VCU to be tested has leakage.

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

[0060] 1) Install the VCU to be tested on the fixing bracket 19 of the corresponding model of 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, the oil pump outlet pressure is increased to 200 bar through the control system 13. If the hydraulic piston cylinder 16 still cannot move normally, stop the functional test, disassemble and inspect the VCU, and reinstall it and perform the functional test again according to steps 1)-7).

[0068] In summary, this test device provides a platform covering all models for testing the exhaust valve control unit (VCU), which 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 descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, 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: Oil tank (1), thermometer (2), air filter (3), temperature sensor (4), heating rod (5), thermostat (6), non-return 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), oil tank cleaning port (18), VCU fixing bracket (19), hydraulic piston cylinder oil inlet hose (20), hydraulic piston cylinder oil return hose (21), VCU oil return hose (22), VCU static test fixture (23), drive oil independent oil tank (24), drive oil inlet hose (25), the test bench frame (17) is provided with an oil tank (1) inside, 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 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 plane of the test bench frame (17).

2. The test device for the VCU of a marine diesel engine according to claim 1, characterized in that: A reinforcing plate (18) is symmetrically fixedly connected to the bottom of the control system (13), and one side of the reinforcing plate (18) is fixedly connected to the test bench frame (17).

3. The test device for the VCU of a marine diesel engine according to claim 1, characterized in that: A fine 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 VCU of a marine diesel engine 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 VCU of a marine diesel engine 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 installed in sequence on the pipeline at the output end of the gear pump (8.1).

6. The test device for the VCU of a marine diesel engine 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 VCU of a marine diesel engine 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 VCU of a marine diesel engine according to claim 1, characterized in that: A VCU fixing bracket (19) is installed on the test bench frame (17) in a plane, and the types of the fixing bracket (19) can cover all existing models of VCU, and all brackets are integrated on the test bench frame (17).

9. The test device for the VCU of a marine diesel engine 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 a driving oil inlet hose (25) by gravity.

10. A static test method for a test device of a marine diesel engine VCU, characterized in that: The test device for the marine diesel engine VCU according to any one of claims 1 to 9 comprises the following steps: 1) Install the VCU to be tested on the fixing bracket (19) of the corresponding model of the test bench, and tighten the VCU fixing bolts with a torque of 210Nm. 2) Tighten the VCU oil inlet hose (14) to the servo oil inlet hole at the bottom of the fixed bracket (19); 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; 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 of the pressure sensor (12), when the system pressure reaches the test pressure of the corresponding model (generally 480 bar, 345 bar), the control system (13) will automatically stop the lubricating oil pump; 5) After standing for 15 minutes, record the pressure shown on the pressure gauge (10) to confirm whether the VCU to be tested has leakage.

11. A functional testing method for a test device of a marine diesel engine VCU, characterized in that: The test device for the marine diesel engine VCU according to any one of claims 1 to 9 comprises the following steps: 1) Install the VCU to be tested on the fixing bracket (19) of the corresponding model of the test bench, and tighten the VCU fixing bolts with a torque of 210Nm. 2) Tighten the VCU oil inlet hose (14) to the servo oil inlet hole at the bottom of the fixed bracket (19); 3) Connect the hydraulic piston cylinder oil inlet hose (20) to the oil outlet hole on the VCU top cover; 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 hose does not need to be connected; 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; 6) Connect the common rail valve on the VCU to the control system (13); 7) Monitor the lubricating oil temperature. The oil temperature for the functional test should be between 35°C and 45°C. The functional test confirms whether the VCU can achieve the control function by observing whether the hydraulic piston cylinder (16) performs reciprocating motion; 8) When the hydraulic piston cylinder (16) fails to move, the oil pump outlet pressure is increased to 200 bar through the control system (13). If the hydraulic piston cylinder (16) still fails to move normally, the function test is stopped, the VCU is disassembled and inspected, and the function test is repeated according to steps 1) to 7) after reassembly.

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