A low-speed engine cylinder lubricating oil pump test system

Abstract

The present invention relates to a test system for a low-speed engine cylinder lubricating oil pump, which includes an oil tank, a liquid level gauge, a low-pressure ball valve, a first high-pressure filter valve, a first one-way valve, a first reversing valve, a leak detection component, a suction filter, a gear pump, a first motor, a second high-pressure filter valve, a relief valve, a second one-way valve, a flow control valve, a second proportional relief valve, a plunger pump, a control system, a monitoring host and a second motor; the gear pump transports the test oil in the oil tank to the low-pressure inlet of the test lubricating oil pump through the second high-pressure filter valve, the second one-way valve, the flow control valve and the second reversing valve, and a relief valve is provided to control the pressure during the process. At the same time, the plunger pump transports the test oil in the oil tank to the high-pressure control oil port of the test lubricating oil pump through the first high-pressure filter, the first one-way valve and the first reversing valve, and a proportional relief valve is provided to control the pressure during the process. The control system and the monitoring host control the solenoid valve of the test lubricating oil pump by electrical signals. Through the detection of the present invention, it is possible to determine whether the cylinder lubricating oil pump is normal and qualified.

Description

Technical Field

[0001] The present invention relates to the technical field of lubrication systems for high-power marine low-speed diesel engines, and particularly to a test system for low-speed engine cylinder lubricating oil pumps. Background Art

[0002] With the increasingly strict domestic and international emission regulations, diverse ship transportation, and various operating conditions of marine low-speed diesel engines, the cylinder bore and stroke designs are different. During the operation of the engine, cylinder liner lubrication plays an important role, requiring uniform and sufficient cylinder liner lubrication. Once the lubrication is poor, it will cause engine cylinder scoring and huge losses. The cylinder liner lubrication of marine low-speed diesel engines mainly relies on lubricating oil pumps to pressurize the lubricating oil, and the lubricating oil is sprayed onto the cylinder liner through lubricating oil injectors for lubrication. At least one lubricating oil pump needs to be equipped for each cylinder. As the power of the engine continues to increase and the number of cylinders increases, the number of lubricating oil pumps on the engine also increases. The normal operation of the lubricating oil pump is becoming increasingly important, and even directly affects the normal operation of the diesel engine. Therefore, it is particularly important to conduct factory tests on the lubricating oil pump and retest the lubricating oil pump during diesel engine maintenance. Summary of the Invention

[0003] The purpose of the present invention is to provide a test system for low-speed engine cylinder lubricating oil pumps, which can detect the performance of low-speed engine cylinder lubricating oil pumps and determine whether the cylinder lubricating oil pumps are normal or qualified for factory production.

[0004] A test system for low-speed engine cylinder lubricating oil pumps according to the present invention includes a test oil tank, a liquid level gauge, a low-pressure ball valve, a first high-pressure filter valve, a first check valve, a first reversing valve, a leak detection component, a suction filter, a gear pump, a first motor, a second high-pressure filter valve, a relief valve, a second check valve, a flow control valve, a second reversing valve, a second proportional relief valve, a plunger pump, a control system, a monitoring host, and a second motor;

[0005] The test oil is the same as the lubricating oil used for diesel engine cylinder lubrication and is stored in the test oil tank;

[0006] The suction filter is arranged in the test oil tank. The suction filter, the gear pump, the second high-pressure filter valve, the second check valve, the flow control valve, and the second reversing valve are connected in sequence. The second reversing valve is connected to the low-pressure oil inlet of the lubricating oil pump. The first motor is connected to the gear pump. The test oil is sucked out by the gear pump after passing through the suction filter and flows into the second high-pressure filter valve. A relief valve is provided at the rear end of the second high-pressure filter valve to make the test oil have a stable pressure and meet the pressure requirements. The test oil that meets the pressure requirements flows through the second check valve and into the flow control valve to ensure the required test oil volume; The test oil that reaches the required pressure and flow rate then flows through the second reversing valve. When the test is in progress, the second reversing valve is opened, and the test oil that meets the requirements flows into the low-pressure oil inlet of the test lubricating oil pump; When the test stops, the second reversing valve is closed, and the test oil that meets the requirements directly flows back to the test oil tank;

[0007] The plunger pump is arranged in the test oil tank. The plunger pump, the first high-pressure filter valve and the first check valve are connected in sequence. The second motor is connected to the plunger pump. The test oil is pumped out by the plunger pump to form high-pressure oil, which flows into the first high-pressure filter valve and the first check valve. A second proportional relief valve is provided at the rear end of the first check valve to ensure the required stable pressure. When the pressure is too high, the excess oil flows directly back to the test oil tank through the return pipe; the first check valve is connected to the first reversing valve. The test oil reaching the required pressure and flow rate then flows through the first reversing valve. The first reversing valve is connected to the high-pressure control oil inlet of the lubricating oil pump. When the test is in progress, the first reversing valve opens, and the test oil reaching the requirements flows into the high-pressure control oil inlet of the test lubricating oil pump; under the action of an electrical signal, the lubricating oil pump solenoid valve continuously switches on and off to form pulsed control oil; when the test stops, the first reversing valve closes, and the test oil reaching the requirements directly flows back to the test oil tank;

[0008] After the low-pressure oil inlet enters the lubricating oil pump, under the action of the pulsed control oil, the test oil is pressurized by the lubricating oil pump piston and sprayed out through the injector connected by the lubricating oil pipe; according to the set number of injection times and the injection weight, the single injection volume is obtained;

[0009] The control system and the monitoring host are respectively electrically connected to the first reversing valve, the leak detection component, the lubricating oil pump, the first motor, the flow control valve, the second reversing valve, the second proportional relief valve and the second motor. The control system and the monitoring host are used to control the switching frequency of the lubricating oil pump solenoid valve, the control oil pressure, and the low-pressure oil inlet temperature and inlet pressure to achieve precise control of the lubricating oil pump action; at the same time, in terms of result analysis, it can monitor the outlet pressure of the lubricating oil pump, form a pressure curve, automatically identify the peak pressure, and calculate the time for the pressure to rise to the maximum value.

[0010] Optionally, a first high-pressure stop valve and a third check valve are sequentially provided at the rear end of the second reversing valve; a second high-pressure stop valve and a fourth check valve are sequentially provided at the rear end of the first reversing valve; the rear ends of the third check valve and the fourth check valve are sequentially connected to a third high-pressure filter, a gear flowmeter and a first proportional relief valve. The first high-pressure stop valve, the second high-pressure stop valve, the gear flowmeter and the first proportional relief valve are respectively electrically connected to the control system and the monitoring host; it is used to detect the back pressure and flow rate and return the excess experimental oil to the test oil tank.

[0011] Optionally, a heater is provided in the test oil tank, and the heater is electrically connected to the control system and the monitoring host to ensure that the temperature of the test oil is maintained within the required range.

[0012] Optionally, a refrigerating machine is further included. The refrigerating machine is connected to the test oil tank and is connected to the control system and the monitoring host to ensure that the temperature of the test oil is maintained within the required range.

[0013] Optionally, a digital display temperature sensor and a liquid level relay are provided inside the test fuel tank. The digital display temperature sensor and the liquid level relay are respectively electrically connected to the control system and the monitoring host computer, and are used to monitor the temperature and liquid level height of the test oil.

[0014] Optionally, an air filter is provided on the test fuel tank to ensure that the pressure inside the test fuel tank is consistent with the ambient air pressure for normal operation.

[0015] Optionally, a waste fuel tank is further included. The return oil and the test consumed oil generated by the lubricating oil pump during the test flow into the waste fuel tank.

[0016] Optionally, a liquid level signal switch, a fuel transfer pump unit and a filter are further included. The liquid level signal switch is arranged inside the waste fuel tank. The liquid level signal switch and the fuel transfer pump unit are both electrically connected to the control system and the monitoring host computer. When the liquid level signal switch detects that the waste oil in the waste fuel tank reaches the set liquid level, the control system and the monitoring host computer control the fuel transfer pump unit to automatically start, and pump the excess waste oil into the test fuel tank through the filter for recycling.

[0017] Optionally, a fifth one-way valve is further included. The inlet end of the fifth one-way valve is connected to the outlet of the lubricating oil pump, and the outlet end of the fifth one-way valve is connected to the outlets of the third one-way valve and the fourth one-way valve to provide back pressure for the lubricating oil pump.

[0018] Advantages of the present invention:

[0019] The low-speed engine cylinder lubricating oil pump test system of the present invention can, through the control of the control system, simulate the operating state of the lubricating oil pump to be tested on the diesel engine, and can achieve the following precise controls, including: precisely controlling the test inlet oil temperature and pressure during the experiment; precisely controlling the high-pressure control oil pressure and pulse frequency; precisely controlling the number of fuel injection operations of the lubricating oil pump; and can achieve the following precise detections: precisely detecting the maximum oil pumping pressure of the lubricating oil; precisely detecting the reaction time (in milliseconds) when the pressure rises to the maximum value; precisely detecting the volume of the lubricating oil pumped by the lubricating oil pump; and can automatically issue a test report, automatically compare the test results according to the engine type requirements, automatically judge, and issue an electronic test report. It has a wide range of applications and can detect the performance of lubricating oil pumps with all current diesel engine cylinder diameters. At the same time, the automation and integration of the test bench greatly reduce the adjustment of test parameters and the subjective judgment of test results by test operators, avoid human errors during the test process, and greatly improve the test efficiency and safety. Description of the Drawings

[0020] Figure 1 It is the principle structure diagram of the test system of the present invention;

[0021] Among them, 1. test fuel tank, 2. liquid level gauge, 3. low-pressure ball valve, 4. heater, 5. digital display temperature sensor, 6. liquid level relay, 7. air filter, 8. first high-pressure filter valve, 9. first check valve, 10. first reversing valve, 11. leak detection component, 12. lubricating oil pump, 13. liquid level signal switch, 14. fuel pump unit, 15. filter, 16. suction filter, 17. gear pump, 18. first motor, 19. second high-pressure filter valve, 20. overflow valve, 21. second check valve, 22. flow control valve, 23. second reversing valve, 24. first high-pressure stop valve, 25. third check valve, 26. gear flowmeter, 27. first proportional overflow valve, 28. second proportional overflow valve, 29. plunger pump, 30. refrigerator, 31. control system and monitoring host, 32. third high-pressure filter valve, 33. second high-pressure stop valve, 34. fourth check valve, 35. fifth check valve, 36. second motor; 37. waste fuel tank. Detailed implementation manners

[0022] The present invention will be described in detail below with reference to the accompanying drawings.

[0023] See Figure 1 As shown, a low-speed engine cylinder lubricating oil pump test system includes a test fuel tank 1, a liquid level gauge 2, a low-pressure ball valve 3, a first high-pressure filter valve 8, a first check valve 9, a first reversing valve 10, a leak detection component 11, a suction filter 16, a gear pump 17, a first motor 18, a second high-pressure filter valve 19, an overflow valve 20, a second check valve 21, a flow control valve 22, a second reversing valve 23, a second proportional overflow valve 28, a plunger pump 29, a control system and a monitoring host 31, and a second motor 36; the specific connection relationship is as follows:

[0024] The test oil is the same as the lubricating oil used for diesel engine cylinder lubrication and is stored in the test fuel tank 1.

[0025] The suction filter 16 is arranged in the test oil tank 1. The suction filter 16, gear pump 17, second high-pressure filter valve 19, second check valve 21, flow control valve 22 and second reversing valve 23 are connected in sequence. The second reversing valve 23 is connected to the low-pressure oil inlet of the lubricating oil pump 12. The first motor 18 is connected to the gear pump 17. The test oil is sucked out by the gear pump 17 (about 25 bar) through the suction filter 16 and flows into the second high-pressure filter valve 19 for filtration. An overflow valve 20 is provided at the rear end of the second high-pressure filter valve 19, and the overflow valve 20 ensures the required stable pressure. The test oil meeting the pressure requirement flows into the flow control valve 22 through the second check valve 21 to ensure the required test oil volume. The test oil reaching the required pressure and flow rate then flows through the second reversing valve 23. When the test is in progress, the second reversing valve 23 is opened, and the test oil reaching the requirement flows into the low-pressure oil inlet of the test lubricating oil pump 12, which is the low-pressure oil inlet of the lubricating oil pump. The low-pressure oil inlet flows into the pump inner cavity through the lubricating oil pump end cover and pump body channels, and then flows into the main piston hole to wait for the piston movement to pressurize. When the test stops, the second reversing valve 23 is closed, and the test oil reaching the requirement directly flows back to the test oil tank 1.

[0026] In this embodiment, the plunger pump 29 is arranged in the test oil tank 1. The plunger pump 29, first high-pressure filter valve 8 and first check valve 9 are connected in sequence. The second motor 36 is connected to the plunger pump 29. The test oil is pumped out by the plunger pump 29 to form high-pressure oil (about 320 bar), which flows into the first high-pressure filter valve 8 and first check valve 9. A second proportional overflow valve 28 is provided at the rear end of the first check valve 9 to ensure the required stable pressure. When the pressure is too high, the excess oil directly flows back to the test oil tank 1 through the return oil pipe. The first check valve 9 is connected to the first reversing valve 10. The test oil reaching the required pressure and flow rate then flows through the first reversing valve 10. The first reversing valve 10 is connected to the high-pressure control oil inlet of the lubricating oil pump 12. When the test is in progress, the first reversing valve 10 is opened, and the test oil reaching the requirement flows into the high-pressure control oil inlet of the test lubricating oil pump 12, which is the high-pressure control oil of the lubricating oil pump. Under the action of the electrical signal, the solenoid valve of the lubricating oil pump 12 continuously switches on and off to form pulsed control oil, which pushes the control piston in the end cover to move downward, and then it continues to push the main piston downward. Due to the relative movement, the test oil is pressurized and extruded by the small piston in the main piston, flows into the check valve, and finally is sprayed out through the connecting oil pipe by the lubricating oil injector. When the test stops, the first reversing valve 10 is closed, and the test oil reaching the requirement directly flows back to the test oil tank 1 for circulating flow.

[0027] In this embodiment, a first high-pressure stop valve 24 and a third one-way valve 25 are successively arranged at the rear end of the second reversing valve 23; a second high-pressure stop valve 33 and a fourth one-way valve 34 are successively arranged at the rear end of the first reversing valve 10; a third high-pressure filter 32, a gear flowmeter 26 and a first proportional overflow valve 27 are successively connected to the rear ends of the third one-way valve 25 and the fourth one-way valve 34. The first high-pressure stop valve 24, the second high-pressure stop valve 33, the gear flowmeter 26 and the first proportional overflow valve 27 are respectively electrically connected to the control system and the monitoring host 31, which are used to detect the back pressure and flow rate and return the excess experimental oil flow back to the test oil tank 1.

[0028] After the low-pressure oil inlet enters the lubricating oil pump 12, under the action of the pulsed control oil, the test oil is pressurized by the lubricating oil pump piston and ejected through the injector connected by the lubricating oil pipe. According to the set number of injection times and the injection weight, the single injection volume can be obtained.

[0029] The outlet of the check valve is communicated with the pump body passage and is connected with a pressure sensor, which is used to detect the lubricating oil pump pressure and time.

[0030] The control system and the monitoring host 31 are respectively electrically connected to the first reversing valve 10, the leak detection component 11, the lubricating oil pump 12, the first motor 18, the flow control valve 22, the second reversing valve 23, the second proportional overflow valve 28 and the second motor 36. The control system and the monitoring host (31) are used to control the battery valve switching frequency of the lubricating oil pump 12, the control oil pressure, and the low-pressure oil inlet temperature and inlet pressure to achieve precise control of the lubricating oil pump action; at the same time, in terms of result analysis, it can monitor the outlet pressure of the lubricating oil pump, form a pressure curve, automatically identify the peak pressure, and calculate the time for the pressure to rise to the maximum value.

[0031] In this embodiment, a heater 4 is arranged in the test oil tank 1, and the heater 4 is electrically connected to the control system and the monitoring host 31 to ensure that the test oil temperature is maintained within the required range.

[0032] In this embodiment, a refrigerator 30 is further included. The refrigerator 30 is connected to the test oil tank 1 and the refrigerator 30 is connected to the control system and the monitoring host 31 to ensure that the test oil temperature is maintained within the required range.

[0033] In this embodiment, a digital display temperature sensor 5 and a liquid level relay 6 are arranged in the test oil tank 1. The digital display temperature sensor 5 and the liquid level relay 6 are respectively electrically connected to the control system and the monitoring host 31, which are used to monitor the test oil temperature and the liquid level height.

[0034] In this embodiment, an air filter 7 is arranged on the test oil tank 1 to ensure that the pressure in the test oil tank 1 is consistent with the ambient air pressure for normal operation.

[0035] In this embodiment, it further includes a waste oil tank 37, and the return oil and the test consumption oil generated by the lubricating oil pump 12 during the test flow into the waste oil tank 37.

[0036] This embodiment further includes a liquid level signal switch 13, a fuel pump unit 14, and a filter 15; the liquid level signal switch 13 is arranged in the waste oil tank 37, and both the liquid level signal switch 13 and the fuel pump unit 14 are electrically connected to the control system and the monitoring host 31. When the liquid level signal switch 13 detects that the waste oil in the waste oil tank 37 reaches the set level, the control system and the monitoring host 31 control the fuel pump unit 14 to automatically start, and pump the excess waste oil into the test tank 1 through the filter 15 for recycling.

[0037] In this embodiment, it further includes a fifth one-way valve 35. The inlet end of the fifth one-way valve 35 is connected to the outlet of the lubricating oil pump 12, and the outlet end of the fifth one-way valve 35 is connected to the outlets of the third one-way valve 25 and the fourth one-way valve 34 to provide back pressure for the lubricating oil pump.

[0038] In this embodiment, the control system and the monitoring host 31 can control the actions of various valves and switches, collect information such as temperature and pressure, so as to realize the control and monitoring of the test system. For example, the switch frequency of the lubricating oil pump solenoid valve, the control oil pressure, the low-pressure inlet oil temperature, and the inlet oil pressure are controlled to achieve precise control of the lubricating oil pump action. At the same time, in terms of result analysis, it can monitor the outlet pressure of the lubricating oil pump, form a pressure curve, automatically identify the peak pressure, and calculate the time (in milliseconds) for the pressure to rise to the maximum value.

[0039] The main indicators of the lubricating oil pump performance are the maximum pump pressure, the time for the pressure to rise to the maximum value, the fuel injection volume of the pump pressure, and the stability of the pressure curve. This invention's test system can fully achieve the above-mentioned required tests and detections, and can also judge whether the tested lubricating oil pump is normal or qualified according to the requirements of specific models. After the test is completed, according to the model of the tested lubricating oil pump and comparing with the test requirements, a test report is automatically formed and an electronic certificate of compliance is issued.

[0040] The working principle of this low-speed engine cylinder lubricating oil pump test system is as follows:

[0041] The heater 4 and the refrigerator 30 ensure that the test oil temperature reaches the requirements. The digital display temperature sensor 5 and the liquid level relay 6 monitor the test oil temperature and the liquid level height; the air filter 7 filters the air intake to ensure that the pressure in the test tank is consistent with the ambient pressure.

[0042] The first motor 18 drives the gear pump 17 to pressurize the test oil (about 25 bar), which is the source of low-pressure inlet oil. The second motor 36 drives the plunger pump 29 to pressurize the test oil to form high-pressure oil (about 320 bar), which is the source of high-pressure control oil.

[0043] In the oil circuit, the filter 15, the suction filter 16, and the second high-pressure filter valve 19 all filter the test oil to ensure the cleanliness of the oil during the test, without impurities, so as to avoid contaminating the test lubricating oil pump and affecting the product quality.

[0044] In the oil circuit, the overflow valve 20, the flow control valve 22, the first proportional overflow valve 27, and the second proportional overflow valve 28 can ensure that the test oil maintains the required pressure and flow rate, and the excess part directly returns to the test oil tank 1.

[0045] In the oil circuit, the second one-way valve 21 prevents the test oil from flowing back due to uneven pressure, and to a certain extent ensures the test pressure and flow rate. The second reversing valve 23 and the first reversing valve 10 respectively control whether the low-pressure inlet oil and the high-pressure control oil of the test lubricating oil pump are supplied. When not supplied, they directly return to the test oil tank 1.

[0046] The control system and the monitoring host 31 control the switching frequency of the lubricating oil pump solenoid valve, the control oil pressure, as well as the low-pressure inlet oil temperature and inlet oil pressure, to achieve precise control of the lubricating oil pump operation. At the same time, it monitors the outlet pressure of the lubricating oil pump, forms a pressure curve, automatically identifies the peak pressure, and calculates the time (in milliseconds) for the pressure to rise to the maximum value.

[0047] The weighing module measures the weight of the injected lubricating oil. The single injection oil volume can be calculated according to the set number of injection times and the injection weight.

[0048] The working process of this low-speed engine cylinder lubricating oil pump test system is as follows:

[0049] Step 1: Assembly and inspection. Install the cylinder lubricating oil pump to be tested, connect each pipeline and electronic connector, and check the connection of each component.

[0050] Step 2: Power on the test system and press the start button of each motor. Turn on the monitoring host and run the test software. Click "New Test" and enter information such as the engine model, product number, and test personnel.

[0051] Step 3: Observe the "Tank Temperature" on the operation interface and set it to the appropriate test temperature.

[0052] Step 4: Click the "ON" buttons of "High-pressure Oil Supply" and "Low-pressure Oil Supply", adjust the high-pressure oil supply and low-pressure oil supply pressures through the operation interface, confirm the oil supply flow rate, and then click the "ON" button of "Clamping Control".

[0053] Step 5: Set the number of working times and the working frequency.

[0054] Step 6: Click the "ON (Automatic)" button, the lubricating oil pump starts to operate, and after completing the set number of working times, the test automatically stops.

[0055] Step 7: Click the "Save Data" button to automatically generate a report.

[0056] Step Eight: Repeat the foregoing steps after turning off the test system or replacing the cylinder lubricating oil pump.

[0057] For the test system of the present invention, power consumption, liquid level, temperature, pressure, explosion-proof door, etc. are all monitored and fed back to the control system, and it can be operated on the built-in monitor of the system or remotely connected to a computer.

[0058] The test system of the present invention is provided with multiple safety measures. When the pressure is abnormal, it will automatically relieve pressure and even shut down. At the same time, an emergency stop button is provided, and there is no danger of overpressure and leakage.

Claims

1. A test system for a cylinder lubricating oil pump of a low-speed engine, characterized in that: It includes a test oil tank (1), a liquid level gauge (2), a low-pressure ball valve (3), a first high-pressure filter valve (8), a first check valve (9), a first reversing valve (10), a leak detection assembly (11), a suction filter (16), a gear pump (17), a first motor (18), a second high-pressure filter valve (19), a relief valve (20), a second check valve (21), a flow control valve (22), a second reversing valve (23), a second proportional relief valve (28), a plunger pump (29), a control system and a monitoring host (31), and a second motor (36); The test oil is the same as the lubricating oil used for diesel engine cylinder lubrication, and both are stored in the test oil tank (1); The suction filter (16) is arranged in the test oil tank (1). The suction filter (16), the gear pump (17), the second high-pressure filter valve (19), the second check valve (21), the flow control valve (22), and the second reversing valve (23) are connected in sequence. The second reversing valve (23) is connected to the low-pressure oil inlet of the lubricating oil pump (12). The first motor (18) is connected to the gear pump (17). The test oil is sucked out by the gear pump (17) after passing through the suction filter (16) and flows into the second high-pressure filter valve (19). A relief valve (20) is provided at the rear end of the second high-pressure filter valve (19) to make the test oil have a stable pressure. The test oil meeting the pressure requirement flows through the second check valve (21) and into the flow control valve (22) to ensure the required test oil volume. The test oil reaching the required pressure and flow rate then flows through the second reversing valve (23). When the test is in progress, the second reversing valve (23) is opened, and the test oil reaching the requirement flows into the low-pressure oil inlet of the test lubricating oil pump (12). When the test stops, the second reversing valve (23) is closed, and the test oil reaching the requirement directly flows back to the test oil tank (1); The plunger pump (29) is arranged in the test oil tank (1). The plunger pump (29), the first high-pressure filter valve (8), and the first check valve (9) are connected in sequence. The second motor (36) is connected to the plunger pump (29). The test oil is pumped out by the plunger pump (29) to form high-pressure oil, which flows into the first high-pressure filter valve (8) and the first check valve (9). A second proportional relief valve (28) is provided at the rear end of the first check valve (9) to ensure the required stable pressure. When the pressure is too high, the excess oil directly flows back to the test oil tank (1) through the return pipe. The first check valve (9) is connected to the first reversing valve (10). The test oil reaching the required pressure and flow rate then flows through the first reversing valve (10). The first reversing valve (10) is connected to the high-pressure control oil inlet of the lubricating oil pump (12). When the test is in progress, the first reversing valve (10) is opened, and the test oil reaching the requirement flows into the high-pressure control oil inlet of the test lubricating oil pump (12). Under the action of the electrical signal, the solenoid valve of the lubricating oil pump (12) continuously switches on and off to form pulsed control oil. When the test stops, the first reversing valve (10) is closed, and the test oil reaching the requirement directly flows back to the test oil tank (1); After the low-pressure oil inlet enters the lubricating oil pump (12), under the action of the pulsed control oil, the test oil is pressurized by the lubricating oil pump piston and ejected through the injector connected by the lubricating oil pipe. According to the set number of injection times and the injection weight, the single injection volume is obtained; The control system and the monitoring host (31) are respectively electrically connected to the first reversing valve (10), the leak detection component (11), the lubricating oil pump (12), the first motor (18), the flow control valve (22), the second reversing valve (23), the second proportional overflow valve (28) and the second motor (36). The control system and the monitoring host (31) are used to control the battery valve switching frequency of the lubricating oil pump (12), the control oil pressure, and the low-pressure oil inlet temperature and inlet pressure to achieve precise control of the lubricating oil pump action; at the same time, in terms of result analysis, it can monitor the outlet pressure of the lubricating oil pump, form a pressure curve, automatically identify the peak pressure, and calculate the time for the pressure to rise to the maximum value.

2. The low-speed engine cylinder lubricating oil pump test system according to claim 1, characterized in that: A first high-pressure stop valve (24) and a third one-way valve (25) are sequentially arranged at the rear end of the second reversing valve (23); a second high-pressure stop valve (33) and a fourth one-way valve (34) are sequentially arranged at the rear end of the first reversing valve (10); the rear ends of the third one-way valve (25) and the fourth one-way valve (34) are sequentially connected with a third high-pressure filter (32), a gear flowmeter (26) and a first proportional overflow valve (27). The first high-pressure stop valve (24), the second high-pressure stop valve (33), the gear flowmeter (26) and the first proportional overflow valve (27) are respectively electrically connected to the control system and the monitoring host (31); it is used to detect the back pressure and flow rate, and return the redundant experimental oil flow to the test oil tank (1).

3. The low-speed engine cylinder lubricating oil pump test system according to claim 1 or 2, characterized in that: A heater (4) is arranged in the test oil tank (1), and the heater (4) is electrically connected to the control system and the monitoring host (31) to ensure that the temperature of the test oil is kept within the required range.

4. The low-speed engine cylinder lubricating oil pump test system according to claim 3, characterized in that: It also includes a refrigerator (30), the refrigerator (30) is connected to the test oil tank (1), and the refrigerator (30) is electrically connected to the control system and the monitoring host (31) to ensure that the temperature of the test oil is kept within the required range.

5. The low-speed engine cylinder lubricating oil pump test system according to claim 4, characterized in that: A digital display temperature sensor (5) and a liquid level relay (6) are arranged in the test oil tank (1), and the digital display temperature sensor (5) and the liquid level relay (6) are respectively electrically connected to the control system and the monitoring host (31) for monitoring the temperature and liquid level height of the test oil.

6. The low-speed engine cylinder lubricating oil pump test system according to claim 5, characterized in that: An air filter (7) is arranged on the test oil tank (1) to ensure that the pressure in the test oil tank (1) is consistent with the ambient air pressure and works normally.

7. The low-speed engine cylinder lubricating oil pump test system according to claim 6, characterized in that: It also includes a waste oil tank (37), and the return oil and test consumption oil generated by the lubricating oil pump (12) during the test flow into the waste oil tank (37).

8. The low-speed engine cylinder lubricating oil pump testing system according to claim 7, characterized in that: It further includes a liquid level signaling switch (13), a submersible pump unit (14) and a filter (15); the liquid level signaling switch (13) is arranged in the waste oil tank (37), and both the liquid level signaling switch (13) and the submersible pump unit (14) are electrically connected to the control system and the monitoring host (31). When the liquid level signaling switch (13) detects that the waste oil in the waste oil tank (37) reaches the set level, the control system and the monitoring host (31) control the submersible pump unit (14) to automatically start, and pump the excess waste oil into the test tank (1) through the filter (15) for recycling.

9. The low-speed engine cylinder lubricating oil pump test system according to any one of claims 4 to 8, characterized in that: It further includes a fifth check valve (35), the inlet end of the fifth check valve (35) is connected to the outlet of the lubricating oil pump (12), and the outlet end of the fifth check valve (35) is connected to the outlets of the third check valve (25) and the fourth check valve (34) to provide back pressure for the lubricating oil pump (12).

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